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Universidade do Rio Grande do Norte
1.
Oliveira, Thiago Bruno Rafael de Freiras.
Teorias f(R) de gravidade na formulação de
Palatini
.
Degree: 2010, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/18587 
► In this dissertation, after a brief review on the Einstein s General Relativity Theory and its application to the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological models, we present…
(more)
▼ In this dissertation, after a brief review on the Einstein s General Relativity Theory
and its application to the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological
models, we present and discuss the alternative theories of gravity dubbed
f(
R) gravity. These theories come about when one substitute in the Einstein-Hilbert
action the Ricci curvature
R by some well behaved nonlinear function
f(
R). They
provide an alternative way to explain the current cosmic acceleration with no need
of invoking neither a dark energy component, nor the existence of extra spatial dimensions.
In dealing with
f(
R) gravity, two different variational approaches may
be followed, namely the metric and the Palatini formalisms, which lead to very
different equations of motion. We briefly describe the metric formalism and then
concentrate on the Palatini variational approach to the gravity action. We make a
systematic and detailed derivation of the field equations for Palatini
f(
R) gravity,
which generalize the Einsteins equations of General Relativity, and obtain also the
generalized Friedmann equations, which can be used for cosmological tests. As an
example, using recent compilations of type Ia Supernovae observations, we show
how the
f(
R) =
R − fi/Rn class of gravity theories explain the recent observed
acceleration of the universe by placing reasonable constraints on the free parameters
fi and n.
We also examine the question as to whether Palatini
f(
R) gravity theories
permit space-times in which causality, a fundamental issue in any physical theory
[22], is violated. As is well known, in General Relativity there are solutions to the
viii
field equations that have causal anomalies in the form of closed time-like curves,
the renowned Gödel model being the best known example of such a solution. Here
we show that every perfect-fluid Gödel-type solution of Palatini
f(
R) gravity with
density and pressure p that satisfy the weak energy condition + p 0 is necessarily
isometric to the Gödel geometry, demonstrating, therefore, that these theories
present causal anomalies in the form of closed time-like curves. This result extends a
theorem on Gödel-type models to the framework of Palatini
f(
R) gravity theory. We
derive an expression for a critical radius rc (beyond which causality is violated) for
an arbitrary Palatini
f(
R) theory. The expression makes apparent that the violation
of causality depends on the form of
f(
R) and on the matter content components.
We concretely examine the Gödel-type perfect-fluid solutions in the
f(
R) =
R−fi/Rn class of Palatini gravity theories, and show that for positive matter density
and for fi and n in the range permitted by the observations, these theories do not
admit the Gödel geometry as a perfect-fluid solution of its field equations. In this
sense,
f(
R) gravity theory remedies the causal pathology in the form of closed timelike
curves which is allowed in General Relativity. We also examine the violation
of causality of Gödel-type by considering a single scalar field as…
Advisors/Committee Members: Santos, Janilo (advisor), CPF:01999044487 (advisor), http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4763288H3 (advisor).
Subjects/Keywords: Teoria de Einstein;
Campo gravitacional;
Teorias f(R);
formulação de Palatini;
Gravity;
Gravitational field;
Palatini f(R) gravity
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oliveira, T. B. R. d. F. (2010). Teorias f(R) de gravidade na formulação de
Palatini
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/18587
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Oliveira, Thiago Bruno Rafael de Freiras. “Teorias f(R) de gravidade na formulação de
Palatini
.” 2010. Thesis, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/18587.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Oliveira, Thiago Bruno Rafael de Freiras. “Teorias f(R) de gravidade na formulação de
Palatini
.” 2010. Web. 27 Jan 2021.
Vancouver:
Oliveira TBRdF. Teorias f(R) de gravidade na formulação de
Palatini
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2010. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/18587.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Oliveira TBRdF. Teorias f(R) de gravidade na formulação de
Palatini
. [Thesis]. Universidade do Rio Grande do Norte; 2010. Available from: http://repositorio.ufrn.br/handle/123456789/18587
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
2.
Thiago Bruno Rafael de Freiras Oliveira.
Teorias f(R) de gravidade na formulação de Palatini.
Degree: 2010, Universidade Federal do Rio Grande do Norte
URL: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=3924
► In this dissertation, after a brief review on the Einsteins General Relativity Theory and its application to the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological models, we present and…
(more)
▼ In this dissertation, after a brief review on the Einsteins General Relativity Theory and its application to the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological models, we present and discuss the alternative theories of gravity dubbed
f(
R) gravity. These theories come about when one substitute in the Einstein-Hilbert action the Ricci curvature
R by some well behaved nonlinear function
f(
R). They provide an alternative way to explain the current cosmic acceleration with no need of invoking neither a dark energy component, nor the existence of extra spatial dimensions. In dealing with
f(
R) gravity, two different variational approaches may be followed, namely the metric and the Palatini formalisms, which lead to very different equations of motion. We briefly describe the metric formalism and then concentrate on the Palatini variational approach to the gravity action. We make a systematic and detailed derivation of the field equations for Palatini
f(
R) gravity, which generalize the Einsteins equations of General Relativity, and obtain also the generalized Friedmann equations, which can be used for cosmological tests. As an example, using recent compilations of type Ia Supernovae observations, we show how the
f(
R) =
R − /Rn class of gravity theories explain the recent observed acceleration of the universe by placing reasonable constraints on the free parameters and n. We also examine the question as to whether Palatini
f(
R) gravity theories permit space-times in which causality, a fundamental issue in any physical theory [22], is violated. As is well known, in General Relativity there are solutions to the viii field equations that have causal anomalies in the form of closed time-like curves, the renowned Gödel model being the best known example of such a solution. Here we show that every perfect-fluid Gödel-type solution of Palatini
f(
R) gravity with density and pressure p that satisfy the weak energy condition + p 0 is necessarily isometric to the Gödel geometry, demonstrating, therefore, that these theories present causal anomalies in the form of closed time-like curves. This result extends a theorem on Gödel-type models to the framework of Palatini
f(
R) gravity theory. We derive an expression for a critical radius rc (beyond which causality is violated) for an arbitrary Palatini
f(
R) theory. The expression makes apparent that the violation of causality depends on the form of
f(
R) and on the matter content components. We concretely examine the Gödel-type perfect-fluid solutions in the
f(
R) =
R−/Rn class of Palatini gravity theories, and show that for positive matter density and for and n in the range permitted by the observations, these theories do not admit the Gödel geometry as a perfect-fluid solution of its field equations. In this sense,
f(
R) gravity theory remedies the causal pathology in the form of closed timelike curves which is allowed in General Relativity. We also examine the violation of causality of Gödel-type by considering a single scalar field as the matter content. For this source,…
Advisors/Committee Members: Márcio Roberto Garcia Maia, Nilza Pires, Janilo Santos.
Subjects/Keywords: Teoria de Einstein; Campo gravitacional; Teorias f(R); formulação de Palatini; FISICA; Gravity; Gravitational field; Palatini f(R) gravity
Record Details
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Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oliveira, T. B. R. d. F. (2010). Teorias f(R) de gravidade na formulação de Palatini. (Thesis). Universidade Federal do Rio Grande do Norte. Retrieved from http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=3924
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Oliveira, Thiago Bruno Rafael de Freiras. “Teorias f(R) de gravidade na formulação de Palatini.” 2010. Thesis, Universidade Federal do Rio Grande do Norte. Accessed January 27, 2021.
http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=3924.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Oliveira, Thiago Bruno Rafael de Freiras. “Teorias f(R) de gravidade na formulação de Palatini.” 2010. Web. 27 Jan 2021.
Vancouver:
Oliveira TBRdF. Teorias f(R) de gravidade na formulação de Palatini. [Internet] [Thesis]. Universidade Federal do Rio Grande do Norte; 2010. [cited 2021 Jan 27].
Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=3924.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Oliveira TBRdF. Teorias f(R) de gravidade na formulação de Palatini. [Thesis]. Universidade Federal do Rio Grande do Norte; 2010. Available from: http://bdtd.bczm.ufrn.br/tedesimplificado//tde_busca/arquivo.php?codArquivo=3924
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Norte
3.
Oliveira, Thiago Bruno Rafael de Freiras.
Teorias f(R) de gravidade na formulação de
Palatini
.
Degree: 2010, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/18587
► In this dissertation, after a brief review on the Einstein s General Relativity Theory and its application to the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological models, we present…
(more)
▼ In this dissertation, after a brief review on the Einstein s General Relativity Theory
and its application to the Friedmann-Lemaitre-Robertson-Walker (FLRW) cosmological
models, we present and discuss the alternative theories of gravity dubbed
f(
R) gravity. These theories come about when one substitute in the Einstein-Hilbert
action the Ricci curvature
R by some well behaved nonlinear function
f(
R). They
provide an alternative way to explain the current cosmic acceleration with no need
of invoking neither a dark energy component, nor the existence of extra spatial dimensions.
In dealing with
f(
R) gravity, two different variational approaches may
be followed, namely the metric and the Palatini formalisms, which lead to very
different equations of motion. We briefly describe the metric formalism and then
concentrate on the Palatini variational approach to the gravity action. We make a
systematic and detailed derivation of the field equations for Palatini
f(
R) gravity,
which generalize the Einsteins equations of General Relativity, and obtain also the
generalized Friedmann equations, which can be used for cosmological tests. As an
example, using recent compilations of type Ia Supernovae observations, we show
how the
f(
R) =
R − fi/Rn class of gravity theories explain the recent observed
acceleration of the universe by placing reasonable constraints on the free parameters
fi and n.
We also examine the question as to whether Palatini
f(
R) gravity theories
permit space-times in which causality, a fundamental issue in any physical theory
[22], is violated. As is well known, in General Relativity there are solutions to the
viii
field equations that have causal anomalies in the form of closed time-like curves,
the renowned Gödel model being the best known example of such a solution. Here
we show that every perfect-fluid Gödel-type solution of Palatini
f(
R) gravity with
density and pressure p that satisfy the weak energy condition + p 0 is necessarily
isometric to the Gödel geometry, demonstrating, therefore, that these theories
present causal anomalies in the form of closed time-like curves. This result extends a
theorem on Gödel-type models to the framework of Palatini
f(
R) gravity theory. We
derive an expression for a critical radius rc (beyond which causality is violated) for
an arbitrary Palatini
f(
R) theory. The expression makes apparent that the violation
of causality depends on the form of
f(
R) and on the matter content components.
We concretely examine the Gödel-type perfect-fluid solutions in the
f(
R) =
R−fi/Rn class of Palatini gravity theories, and show that for positive matter density
and for fi and n in the range permitted by the observations, these theories do not
admit the Gödel geometry as a perfect-fluid solution of its field equations. In this
sense,
f(
R) gravity theory remedies the causal pathology in the form of closed timelike
curves which is allowed in General Relativity. We also examine the violation
of causality of Gödel-type by considering a single scalar field as…
Advisors/Committee Members: Santos, Janilo (advisor), CPF:01999044487 (advisor), http://buscatextual.cnpq.br/buscatextual/visualizacv.do?id=K4763288H3 (advisor).
Subjects/Keywords: Teoria de Einstein;
Campo gravitacional;
Teorias f(R);
formulação de Palatini;
Gravity;
Gravitational field;
Palatini f(R) gravity
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oliveira, T. B. R. d. F. (2010). Teorias f(R) de gravidade na formulação de
Palatini
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/18587
Chicago Manual of Style (16th Edition):
Oliveira, Thiago Bruno Rafael de Freiras. “Teorias f(R) de gravidade na formulação de
Palatini
.” 2010. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/18587.
MLA Handbook (7th Edition):
Oliveira, Thiago Bruno Rafael de Freiras. “Teorias f(R) de gravidade na formulação de
Palatini
.” 2010. Web. 27 Jan 2021.
Vancouver:
Oliveira TBRdF. Teorias f(R) de gravidade na formulação de
Palatini
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2010. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/18587.
Council of Science Editors:
Oliveira TBRdF. Teorias f(R) de gravidade na formulação de
Palatini
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2010. Available from: http://repositorio.ufrn.br/handle/123456789/18587
Universidade do Rio Grande do Norte
4.
Oliveira, Thiago Bruno Rafael de Freitas.
Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
.
Degree: 2015, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/20401
► The currently observed accelerated expansion of the Universe, as well as the so called dark mater problem in astrophysics, has raised many discussions and some…
(more)
▼ The currently observed accelerated expansion of the Universe, as
well as the so called dark mater problem in astrophysics, has raised many
discussions and some doubts about the very well tested Einstein’s theory
of gravitation, known as General Relativity. Several modified, as well as
extended gravity theories, have been formulated in the last 15 years, and
some others been resuscitated in new aspect. In this thesis, we present and
discuss, in the class of extended gravity, the alternative theories known
as
f(
R) gravity. These theories come about when one substitute in the
Einstein-Hilbert action the Ricci scalar curvature
R by some well behaved
nonlinear function
f(
R). They provide an alternative way to explain the
current cosmic acceleration with no need of invoking either a dark energy
component or the existence of an extra spatial dimension. In dealing with
f(
R) gravity, two different variational approaches may be followed, namely
the metric and the Palatini formalisms. In the metric approach the
connections are assumed, ab initio, to be the Levi-Civita connections and
variation of the action is taken with respect to the metric only, whereas in
the Palatini approach the metric and the connections are treated as independent
fields and the variation of the action is taken with respect to both.
Although they give the same equations for the Einstein-Hilbert action, for
a general
f(
R) nonlinear term in the action they give rise to very different
equations of motion. For both formalisms, we make a systematic and
detailed derivation of the field equations, which generalize the Einstein’s
equations of General Relativity and examine the covariant conservation of
this equations. In this regard, we detect and call attention for the covariant
conservation of the equations in Palatini
f(
R) gravity, which, in our view, deserves some more debate on the physical relevance of conformal aspects
of the Palatini approach.
In order to shed some light on the debate about the role of
f(
R)
gravity, we also examine the question as to whether this theories permit
space-times in which the causality, a fundamental issue in any physical
theory, is violated. In the framework of
f(
R) gravity, the causal
structure
of four-dimensional space-time has locally the same qualitative nature as
the flat space-time of special relativity: causality holds locally. The nonlocal
question, however, is left open, and violation of causality can occur. As
is well known, in General Relativity there are solutions to the field equations
that have causal anomalies in the form of closed time-like curves, the
renowned Gödel model being the best known example of such a solution.
Here we show that for
f(
R) gravity satisfying the condition df/dR > 0,
independently of being formulated in metric or Palatini formalism, every
perfect type-fluid Gödel-type solution with density ρ and pressure p that
satisfy the weak energy condition (ρ + p ≥ 0) is necessarily isometric to
the Gödel geometry. This demonstrate that these theories present…
Advisors/Committee Members: Santos, Janilo (advisor), 01999044487 (advisor), http://lattes.cnpq.br/0164449213607380 (advisor).
Subjects/Keywords: Teorias f(R) de gravidade;
Causalidade;
Conservação covariante
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oliveira, T. B. R. d. F. (2015). Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
. (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/20401
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Oliveira, Thiago Bruno Rafael de Freitas. “Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
.” 2015. Thesis, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/20401.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Oliveira, Thiago Bruno Rafael de Freitas. “Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
.” 2015. Web. 27 Jan 2021.
Vancouver:
Oliveira TBRdF. Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
. [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2015. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/20401.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Oliveira TBRdF. Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
. [Thesis]. Universidade do Rio Grande do Norte; 2015. Available from: http://repositorio.ufrn.br/handle/123456789/20401
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universidade do Rio Grande do Norte
5.
Oliveira, Thiago Bruno Rafael de Freitas.
Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
.
Degree: 2015, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/20401
► The currently observed accelerated expansion of the Universe, as well as the so called dark mater problem in astrophysics, has raised many discussions and some…
(more)
▼ The currently observed accelerated expansion of the Universe, as
well as the so called dark mater problem in astrophysics, has raised many
discussions and some doubts about the very well tested Einstein’s theory
of gravitation, known as General Relativity. Several modified, as well as
extended gravity theories, have been formulated in the last 15 years, and
some others been resuscitated in new aspect. In this thesis, we present and
discuss, in the class of extended gravity, the alternative theories known
as
f(
R) gravity. These theories come about when one substitute in the
Einstein-Hilbert action the Ricci scalar curvature
R by some well behaved
nonlinear function
f(
R). They provide an alternative way to explain the
current cosmic acceleration with no need of invoking either a dark energy
component or the existence of an extra spatial dimension. In dealing with
f(
R) gravity, two different variational approaches may be followed, namely
the metric and the Palatini formalisms. In the metric approach the
connections are assumed, ab initio, to be the Levi-Civita connections and
variation of the action is taken with respect to the metric only, whereas in
the Palatini approach the metric and the connections are treated as independent
fields and the variation of the action is taken with respect to both.
Although they give the same equations for the Einstein-Hilbert action, for
a general
f(
R) nonlinear term in the action they give rise to very different
equations of motion. For both formalisms, we make a systematic and
detailed derivation of the field equations, which generalize the Einstein’s
equations of General Relativity and examine the covariant conservation of
this equations. In this regard, we detect and call attention for the covariant
conservation of the equations in Palatini
f(
R) gravity, which, in our view, deserves some more debate on the physical relevance of conformal aspects
of the Palatini approach.
In order to shed some light on the debate about the role of
f(
R)
gravity, we also examine the question as to whether this theories permit
space-times in which the causality, a fundamental issue in any physical
theory, is violated. In the framework of
f(
R) gravity, the causal
structure
of four-dimensional space-time has locally the same qualitative nature as
the flat space-time of special relativity: causality holds locally. The nonlocal
question, however, is left open, and violation of causality can occur. As
is well known, in General Relativity there are solutions to the field equations
that have causal anomalies in the form of closed time-like curves, the
renowned Gödel model being the best known example of such a solution.
Here we show that for
f(
R) gravity satisfying the condition df/dR > 0,
independently of being formulated in metric or Palatini formalism, every
perfect type-fluid Gödel-type solution with density ρ and pressure p that
satisfy the weak energy condition (ρ + p ≥ 0) is necessarily isometric to
the Gödel geometry. This demonstrate that these theories present…
Advisors/Committee Members: Santos, Janilo (advisor), 01999044487 (advisor), http://lattes.cnpq.br/0164449213607380 (advisor).
Subjects/Keywords: Teorias f(R) de gravidade;
Causalidade;
Conservação covariante
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Oliveira, T. B. R. d. F. (2015). Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
. (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/20401
Chicago Manual of Style (16th Edition):
Oliveira, Thiago Bruno Rafael de Freitas. “Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
.” 2015. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/20401.
MLA Handbook (7th Edition):
Oliveira, Thiago Bruno Rafael de Freitas. “Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
.” 2015. Web. 27 Jan 2021.
Vancouver:
Oliveira TBRdF. Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
. [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2015. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/20401.
Council of Science Editors:
Oliveira TBRdF. Um estudo sobre a violação de causalidade em teorias f (R) de gravidade
. [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2015. Available from: http://repositorio.ufrn.br/handle/123456789/20401
Universidade do Rio Grande do Norte
6.
Souza, Tatiane Cunha de.
O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
.
Degree: 2017, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/26859
► This research has as its central study the creative process and the Ritual Scenic Experiences built by the participants linked to the Grupo Maré de…
(more)
▼ This research has as its central study the creative process and the Ritual Scenic
Experiences built by the participants linked to the Grupo Maré
de Artes – Programa
Mais Cultura Nas Escolas, of the Escola Municipal Edinor Avelino – Macau/RN,
where the researcher worked as a Theatre Teacher, between the years 2014 and
2016. This creative process was instigated from educational paths that were
experienced and that focus on the principles and ritualistic procedures of the scene
and the game. From the experience with Bando La Trupe, developing public art
experiences; through the Arkhétypos Grupo
de Teatro and the proposition of the art
of encounter; getting to Unaluna and the concepts/practices of the Mithodology in Art
and Artetnography, the researcher points out art of
f(
r)iction, the student-active as a
subject of
f(
r)iction, which rubs his real and fictional stories, strolling between the real
and the imaginary, in a constant
f(
r)iction from him with himself, with each other and
with the community where he is inserted (LYRA, 2015).
Advisors/Committee Members: Lyra, Luciana de Fátima Rocha Pereira de (advisor), 83010785453 (advisor), Haderchpek, Robson Carlos (advisor), 21589603885 (advisor).
Subjects/Keywords: Pedagogia do teatro;
Processo de criação;
Comunidade;
Experiência cênico-ritual;
Sujeito de f(r)icção
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Souza, T. C. d. (2017). O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/26859
Chicago Manual of Style (16th Edition):
Souza, Tatiane Cunha de. “O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
.” 2017. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/26859.
MLA Handbook (7th Edition):
Souza, Tatiane Cunha de. “O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
.” 2017. Web. 27 Jan 2021.
Vancouver:
Souza TCd. O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2017. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/26859.
Council of Science Editors:
Souza TCd. O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2017. Available from: http://repositorio.ufrn.br/handle/123456789/26859
Universidade do Rio Grande do Norte
7.
Souza, Tatiane Cunha de.
O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
.
Degree: 2017, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/26859
► This research has as its central study the creative process and the Ritual Scenic Experiences built by the participants linked to the Grupo Maré de…
(more)
▼ This research has as its central study the creative process and the Ritual Scenic
Experiences built by the participants linked to the Grupo Maré
de Artes – Programa
Mais Cultura Nas Escolas, of the Escola Municipal Edinor Avelino – Macau/RN,
where the researcher worked as a Theatre Teacher, between the years 2014 and
2016. This creative process was instigated from educational paths that were
experienced and that focus on the principles and ritualistic procedures of the scene
and the game. From the experience with Bando La Trupe, developing public art
experiences; through the Arkhétypos Grupo
de Teatro and the proposition of the art
of encounter; getting to Unaluna and the concepts/practices of the Mithodology in Art
and Artetnography, the researcher points out art of
f(
r)iction, the student-active as a
subject of
f(
r)iction, which rubs his real and fictional stories, strolling between the real
and the imaginary, in a constant
f(
r)iction from him with himself, with each other and
with the community where he is inserted (LYRA, 2015).
Advisors/Committee Members: Lyra, Luciana de Fátima Rocha Pereira de (advisor), 83010785453 (advisor), Haderchpek, Robson Carlos (advisor), 21589603885 (advisor).
Subjects/Keywords: Pedagogia do teatro;
Processo de criação;
Comunidade;
Experiência cênico-ritual;
Sujeito de f(r)icção
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Souza, T. C. d. (2017). O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/26859
Chicago Manual of Style (16th Edition):
Souza, Tatiane Cunha de. “O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
.” 2017. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/26859.
MLA Handbook (7th Edition):
Souza, Tatiane Cunha de. “O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
.” 2017. Web. 27 Jan 2021.
Vancouver:
Souza TCd. O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2017. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/26859.
Council of Science Editors:
Souza TCd. O Grupo Maré de Artes e a comunhão ritualística: um jogo entre sujeitos de f(r)icção
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2017. Available from: http://repositorio.ufrn.br/handle/123456789/26859
8.
Al Murad, Zainy Mshco Hajy.
Complexity matching processes during the coupling of biological systems : application to rehabilitation in elderly : Processus d’appariement des complexités lors du couplage de deux systèmes biologiques : application à la rééducation de la marche chez les personnes âgées.
Degree: Docteur es, Sciences du Mouvement Humain - MPL, 2019, Montpellier
URL: http://www.theses.fr/2019MONT4001
► Plusieurs cadres théoriques ont tenté de rendre compte des processus de synchronisation interpersonnelle. Les théories cognitivistes suggèrent que la synchronisation est réalisée par le biais…
(more)
▼ Plusieurs cadres théoriques ont tenté
de rendre compte des processus
de synchronisation interpersonnelle. Les théories cognitivistes suggèrent que la synchronisation est réalisée par le biais d’une correction discrète et mutuelle des asynchronies entre les deux partenaires. Les théories dynamiques reposent sur l’hypothèse d’un couplage continu des deux systèmes, conçus comme oscillateurs auto-entretenus. Enfin le modèle du complexity matching repose sur l’hypothèse d’une coordination multi-échelle entre les deux systèmes en interaction. Dans un premier temps, nous développons des tests statistiques permettant
de repérer dans les données expérimentales les signatures typiques
de ces trois modes
de coordination. Nous proposons notamment une signature multifractale, basée sur l’analyse des corrélations entre les spectres multifractals caractérisant les séries produites par les deux systèmes en interaction. Nous développons également une analyse
de cross-corrélation fenêtrée, qui permet
de dévoiler les processus locaux
de synchronisation mis en œuvre. Ces études nous permettent
de revisiter un certain nombre
de travaux antérieurs. Nous montrons notamment que si la synchronisation
de tâches discrètes telles que le tapping repose en effet sur des processus
de correction discrète des asynchronies, la synchronisation
de tâches continues telles que les oscillations
de pendules est essentiellement basée sur les mêmes principes
de correction discrète, et non sur un couplage continu des effecteurs. Nos résultats indiquent également que la synchronisation peut révéler des mécanismes hybrides mixant notamment correction des asynchronies et complexity matching. Enfin nous mettons en évidence que la marche synchronisée met en œuvre un effet dominant
de complexity matching, d’autant plus prégnant que les deux partenaires sont étroitement couplés (marche bras-dessus-bras-dessous). Nous proposons dans un second temps d’exploiter ce résultat pour tester la possibilité d’une restauration
de la complexité chez les personnes âgées. Le vieillissement a en effet été caractérisé comme un processus
de perte graduelle
de complexité, et cet effet a été notamment documenté dans le domaine
de la locomotion. Il a notamment été montré que la perte
de complexité corrélait avec la propension à la chute. La théorie du complexity matching suppose que deux systèmes en interaction tendent à aligner leurs niveaux
de complexité. Elle suppose également que lorsque deux systèmes
de niveaux différents
de complexité interagissent, le système le plus complexe tend à attirer le moins complexe, engendrant un accroissement
de la complexité chez le second. Nous montrons, dans un protocole au cours duquel des personnes âgées sont invitées à marcher bras-dessus-bras-dessous avec un accompagnant jeune, que la synchronisation entre les deux partenaires est réalisée au travers d’un effet d’appariement des complexités, et que l’entrainement prolongé en marche synchronisée permet une restauration
de la complexité
de la locomotion chez les personnes âgées. Cet effet perdure…
Advisors/Committee Members: Delignières, Didier (thesis director).
Subjects/Keywords: Coordination; Complexité; Multifractalité; Vieillissement; Structure 1/f; Restauration de la complexité; Coordination; Complexity; Multifractality; Aging; 1/f structure; Restoration of complexity
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Al Murad, Z. M. H. (2019). Complexity matching processes during the coupling of biological systems : application to rehabilitation in elderly : Processus d’appariement des complexités lors du couplage de deux systèmes biologiques : application à la rééducation de la marche chez les personnes âgées. (Doctoral Dissertation). Montpellier. Retrieved from http://www.theses.fr/2019MONT4001
Chicago Manual of Style (16th Edition):
Al Murad, Zainy Mshco Hajy. “Complexity matching processes during the coupling of biological systems : application to rehabilitation in elderly : Processus d’appariement des complexités lors du couplage de deux systèmes biologiques : application à la rééducation de la marche chez les personnes âgées.” 2019. Doctoral Dissertation, Montpellier. Accessed January 27, 2021.
http://www.theses.fr/2019MONT4001.
MLA Handbook (7th Edition):
Al Murad, Zainy Mshco Hajy. “Complexity matching processes during the coupling of biological systems : application to rehabilitation in elderly : Processus d’appariement des complexités lors du couplage de deux systèmes biologiques : application à la rééducation de la marche chez les personnes âgées.” 2019. Web. 27 Jan 2021.
Vancouver:
Al Murad ZMH. Complexity matching processes during the coupling of biological systems : application to rehabilitation in elderly : Processus d’appariement des complexités lors du couplage de deux systèmes biologiques : application à la rééducation de la marche chez les personnes âgées. [Internet] [Doctoral dissertation]. Montpellier; 2019. [cited 2021 Jan 27].
Available from: http://www.theses.fr/2019MONT4001.
Council of Science Editors:
Al Murad ZMH. Complexity matching processes during the coupling of biological systems : application to rehabilitation in elderly : Processus d’appariement des complexités lors du couplage de deux systèmes biologiques : application à la rééducation de la marche chez les personnes âgées. [Doctoral Dissertation]. Montpellier; 2019. Available from: http://www.theses.fr/2019MONT4001
9.
Ma, Yue.
Équations d'onde nonlinéaires de type Klein-Gordon : application à la théorie f(R) de la gravitation : Nonlinear Klein-Gordon equation and its application on f(R) theory of gravitation.
Degree: Docteur es, Mathématiques Appliquées, 2014, Université Pierre et Marie Curie – Paris VI
URL: http://www.theses.fr/2014PA066379
► Cette thèse est composée de deux parties qui sont relativement indépendantes l’un de l’autre. Dans la première partie,une autre théorie de la gravitation que l’on…
(more)
▼ Cette thèse est composée de deux parties qui sont relativement indépendantes l’un de l’autre. Dans la première partie,une autre théorie de la gravitation que l’on appelle la gravité de f(R), est étudiée. Une première analyse mathématique est discutée sur cette théorie, y compris la formulation mathématique du problème de Cauchy, la discussion sur le choix du couplage, et la formulation mathématique des équations différentielles. Ce système des équations différentielles est de quatrième ordre et très impliqué. Pour pouvoir établir l’existence locale, une série de transformations et reformulation et introduites. Elles nous amènent à une formulation que l’on l’appelle la formulation conforme augmenté. Avec cette formulation, l’existence locale est établie. La deuxième partie est consacrée à l’analyse d’un type de système non-linéaire composé des équations d’onde et équations de Klein-Gordon. Ce type de système apparaît naturellement dans de nombreux modèles physiques: le plus important, l’équation d’Einstein couplé avec un champ scalaire réel du massif et le système de la formulation conforme augmentée de la théorie de f(R). La difficulté principale est le manque de la symétrie: un des champs de vecteur de Killing conforme de l’opérateur d’onde, le champ de vecteur de scaling S := t∂ t +r∂ r, n’est pas un champ de vecteur de Killing conforme de l’opérateur de Klein Gordon. Pour franchir cette difficulté, un nouveau cadre, appelé la méthode de feuilletage hyperboloïdal, est introduit. Avec ce cadre, nous pouvons encadrer les équations d’onde et les équations de Klein-Gordon dans le même cadre. Cela nous permet d’établir un résultat d’existence globale pour les données initiales petites et localisées dans un compact.
This these is composed by two parts which are relatively independent to each other. In the first part an alternative theory of the gravitation, the so-called f(R) gravity, is studied. A first mathematical analysis is discussed on this theory, including the mathematical formulation of the Cauchy problem, the discussion on the choice of coupling, the mathematical formulation of the differential system. This system is four-order and highly involved. To establish the local well-posedness result, a series of transformations ans re-formulations is introduced and we finally arrived at a formulation, called the augmented conformal formulation with which we have managed to establish the local well-poseness theory.The second part is devoted to the analysis of a type of coupled wave and Klein-Gordon system. This kind of system arises naturally in many physical model, especially in the Einstein equation coupled with a real massive scalar field and the augmented conformal formulation of the f(R) gravity. The main difficulty to treat this type of system is the lack of symmetry: one of the conformal Killing vector filed of the linear wave operator, the scaling vector field S := t∂t+r∂r is not a conformal Killing vector field of the linear Klein-Gordon operator. To overpass this difficult, a new framework, called the…
Advisors/Committee Members: Le Floch, Philippe (thesis director).
Subjects/Keywords: Théorie f(R) de la gravitation; Coordonnées d'onde; Système augmenté; Feuilletage hyperboloïdal; Argument de bootstrap; Repère semi-hyperboloïdal; F(R) gravity theory; Wave equations; 515.3
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ma, Y. (2014). Équations d'onde nonlinéaires de type Klein-Gordon : application à la théorie f(R) de la gravitation : Nonlinear Klein-Gordon equation and its application on f(R) theory of gravitation. (Doctoral Dissertation). Université Pierre et Marie Curie – Paris VI. Retrieved from http://www.theses.fr/2014PA066379
Chicago Manual of Style (16th Edition):
Ma, Yue. “Équations d'onde nonlinéaires de type Klein-Gordon : application à la théorie f(R) de la gravitation : Nonlinear Klein-Gordon equation and its application on f(R) theory of gravitation.” 2014. Doctoral Dissertation, Université Pierre et Marie Curie – Paris VI. Accessed January 27, 2021.
http://www.theses.fr/2014PA066379.
MLA Handbook (7th Edition):
Ma, Yue. “Équations d'onde nonlinéaires de type Klein-Gordon : application à la théorie f(R) de la gravitation : Nonlinear Klein-Gordon equation and its application on f(R) theory of gravitation.” 2014. Web. 27 Jan 2021.
Vancouver:
Ma Y. Équations d'onde nonlinéaires de type Klein-Gordon : application à la théorie f(R) de la gravitation : Nonlinear Klein-Gordon equation and its application on f(R) theory of gravitation. [Internet] [Doctoral dissertation]. Université Pierre et Marie Curie – Paris VI; 2014. [cited 2021 Jan 27].
Available from: http://www.theses.fr/2014PA066379.
Council of Science Editors:
Ma Y. Équations d'onde nonlinéaires de type Klein-Gordon : application à la théorie f(R) de la gravitation : Nonlinear Klein-Gordon equation and its application on f(R) theory of gravitation. [Doctoral Dissertation]. Université Pierre et Marie Curie – Paris VI; 2014. Available from: http://www.theses.fr/2014PA066379
Universidade do Rio Grande do Norte
10.
Silva, Karla Lidiane Costa Martins.
Thérèse, êxtase de um corpo ofertado: travessia mitodológica de uma artista de f(r)icção
.
Degree: 2017, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/24468
► This dissertation, entitled Thérèse, ecstasy of an offered body: the mythodological journey of a f(r)iction artist, travels over the grounds of art and holiness, discussed…
(more)
▼ This dissertation, entitled Thérèse, ecstasy of an offered body: the mythodological journey of a
f(
r)iction artist, travels over the grounds of art and holiness, discussed here by means of a practical/theoretical research embraced by the artist-researcher Karla Martins about her guide-myth: Saint Therese of the Child Jesus. The French saint, also known as the Holy Face, manifests itself in this investigation through the scope of the artist-researcher’s personal mythology and unveils herself through a performative experience. In order to carry such experience on, the research was based on the Mythodology in Art and the Artethnography, practices/concepts upheld by Prof. Ph.D. Luciana Lyra (UERJ), which, in turn, are connected to the fields of Anthropology of Experience (Anthropology of Performance), led by anthropologist Victor Turner, and Anthropology of the Imaginary, led by sociologist Gilbert Durand, which by their turn involve rites of passage, image, myth and ritual. The application of these mythodological procedures cause the most intimate of the artist-researcher’s pulsions to erupt and pervade her writing, as well as the creation of the performance Thérèse itself.
Advisors/Committee Members: Lyra, Luciana de Fátima Rocha Pereira de (advisor), 83010785453 (advisor).
Subjects/Keywords: Santa Teresinha;
Mito;
Rito;
Performance;
Mitodologia em arte;
Artetnografia;
Artista de f(r)icção
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Silva, K. L. C. M. (2017). Thérèse, êxtase de um corpo ofertado: travessia mitodológica de uma artista de f(r)icção
. (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/24468
Chicago Manual of Style (16th Edition):
Silva, Karla Lidiane Costa Martins. “Thérèse, êxtase de um corpo ofertado: travessia mitodológica de uma artista de f(r)icção
.” 2017. Masters Thesis, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/24468.
MLA Handbook (7th Edition):
Silva, Karla Lidiane Costa Martins. “Thérèse, êxtase de um corpo ofertado: travessia mitodológica de uma artista de f(r)icção
.” 2017. Web. 27 Jan 2021.
Vancouver:
Silva KLCM. Thérèse, êxtase de um corpo ofertado: travessia mitodológica de uma artista de f(r)icção
. [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2017. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/24468.
Council of Science Editors:
Silva KLCM. Thérèse, êxtase de um corpo ofertado: travessia mitodológica de uma artista de f(r)icção
. [Masters Thesis]. Universidade do Rio Grande do Norte; 2017. Available from: http://repositorio.ufrn.br/handle/123456789/24468
Universidade do Rio Grande do Norte
11.
Santos, Crislane de Souza.
A equação de Raychaudhuri e o caráter não-atrativo da gravidade f(R)
.
Degree: 2017, Universidade do Rio Grande do Norte
URL: http://repositorio.ufrn.br/handle/123456789/23654
► The observational evidence of the accelerated expansion of the Universe has been the main reason for a revision of the cosmological evolution as predicted by…
(more)
▼ The observational evidence of the accelerated expansion of the Universe has been the
main reason for a revision of the cosmological evolution as predicted by General Relativity
(GR). Currently there are two main approaches to solving this problem: by introducing
in the Einstein’s equations a term which represent a new kind of fluid (the so-called
dark energy possessing exotic features) or by the modification of the gravitation theory.
In this thesis we focus on the second approach, particularly the theories know as
f(
R) theories
of gravity, which have received many attention in the last years. In this framework,
the Raychaudhuri equation makes possible to examine the whole of spacetime structures
without specific solutions of Einstein’s equations, playing so a central role to the understanding
of gravitational attraction in Astrophysics and Cosmology. In the general
relativity theory of gravity without a cosmological constant, a non-positive contribution
from the spacetime to Raychaudhuri’s equation is usually interpreted as manifestation of
the attractive character of gravity. In this case, particular energy conditions - indeed the
strong energy condition - must be assumed in order to guarantee this attractive character.
In the context of
f(
R) theories of gravity however, even assuming the usual energy
conditions we may have a positive contribution to Raychaudhuri’s equation. Besides giving
us a simple way to explain the observed accelerated expansion of the Universe, this
fact opens the possibility of a repulsive character of this kind of gravity. In this thesis we
address the attractive/non-attractive character of
f(
R) theories of gravity at the light of
Raychaudhuri’s equation and make use of the strong energy condition, jointly with recent
estimated values for the cosmographic parameters, in order to put bounds on a paradigmatic
class of
f(
R) theories of gravity.
Advisors/Committee Members: Santos, Janilo (advisor), 01999044487 (advisor), http://lattes.cnpq.br/0164449213607380 (advisor).
Subjects/Keywords: Teorias f(R) de gravidade;
Condições de energia;
Equação de Raychaudhuri e o Caráter atrativo/não-atrativo da gravidade
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Santos, C. d. S. (2017). A equação de Raychaudhuri e o caráter não-atrativo da gravidade f(R)
. (Doctoral Dissertation). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/23654
Chicago Manual of Style (16th Edition):
Santos, Crislane de Souza. “A equação de Raychaudhuri e o caráter não-atrativo da gravidade f(R)
.” 2017. Doctoral Dissertation, Universidade do Rio Grande do Norte. Accessed January 27, 2021.
http://repositorio.ufrn.br/handle/123456789/23654.
MLA Handbook (7th Edition):
Santos, Crislane de Souza. “A equação de Raychaudhuri e o caráter não-atrativo da gravidade f(R)
.” 2017. Web. 27 Jan 2021.
Vancouver:
Santos CdS. A equação de Raychaudhuri e o caráter não-atrativo da gravidade f(R)
. [Internet] [Doctoral dissertation]. Universidade do Rio Grande do Norte; 2017. [cited 2021 Jan 27].
Available from: http://repositorio.ufrn.br/handle/123456789/23654.
Council of Science Editors:
Santos CdS. A equação de Raychaudhuri e o caráter não-atrativo da gravidade f(R)
. [Doctoral Dissertation]. Universidade do Rio Grande do Norte; 2017. Available from: http://repositorio.ufrn.br/handle/123456789/23654
Universitat de Valencia
12.
Gironés Delgado-Ureña, Zahara.
On implications of modified gravity models of dark energy
.
Degree: 2014, Universitat de Valencia
URL: http://hdl.handle.net/10550/40971
► Modern cosmology aims to model the large scale structure and dynamics of the universe, and its origin and fate. It was born as a quantitative…
(more)
▼ Modern cosmology aims to model the large scale
structure and dynamics of the universe, and its origin and fate. It was born as a quantitative science after the advent of Einstein’s theory of General Relativity (GR) in 1915. Soon after, GR found its first empirical verification in its successful prediction of two solar system phenomena: the perihelion precession of Mercury and the deflection of light by the Sun. Since then, GR has become an essential tool in the study of astrophysical and cosmological phenomena. According to GR, the energy and momentum of matter are the source of the gravitational field, and at large scales determine the geometry of the universe. In particular, Einstein studied solutions of the GR field equations for a homogeneous distribution of matter, as a model of the large scale
structure of the universe. He discovered soon that his theory, in its simplest form, does not support a static universe, but instead predicts an expanding or a contracting one. By contrast, the small velocities of the stars observed at that time suggested that the universe is stationary. In order to allow for a steady-state solution, Einstein had to add what came to be called the cosmological constant to the field equations of GR. The dynamics of a homogeneous and isotropic universe according to GR was subsequently studied more systematically by Alexander Friedmann in 1922, again finding expanding or contracting solutions. In parallel, Edwin Hubble discovered the existence of galaxies outside of the Milky Way, which until then was believed to comprise the entire universe. His subsequent observations showed, in 1929, that the recessional velocity of galaxies increases with their distance from the Earth, implying that the universe is expanding. In consequence, Einstein dropped the cosmological constant from the field equations, famously regretting his ad hoc hypothesis of the universe being static as his “greatest blunder.” However, from a quantum field theory perspective, the cosmological constant in fact arises naturally as the energy density of the vacuum; due to the quantum uncertainty principle, the ground state energy of all matter fields is nonzero, and contributes to the vacuum energy density, acting like a cosmological constant for the gravitational field. Thus dropping the cosmological constant from the field equations turned out to beg a theoretical justification. Nevertheless, until the 1990’s the standard cosmological paradigm was described by a homogeneous and isotropic matter-dominated expanding universe, with no cosmological constant.
A great turnover happened in 1998 when observations of type Ia Supernovae (SN Ia) revealed for the first time a very recent trend in the expansion of the universe: at a redshift z < 1 the expansion of the universe started accelerating. This observation has been subsequently corroborated by other independent cosmological observations: the Cosmic Microwave Background (CMB), the Large Scale
Structure (LLS), the Baryonic Acoustic Oscillations (BAO) and the estimated age of the…
Advisors/Committee Members: Peña Garay, Carlos (advisor).
Subjects/Keywords: relatividad general;
gravedad modificada;
cosmología;
modelos f(R);
aceleración de la expansión del universo;
energía oscura;
física teórica
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APA (6th Edition):
Gironés Delgado-Ureña, Z. (2014). On implications of modified gravity models of dark energy
. (Doctoral Dissertation). Universitat de Valencia. Retrieved from http://hdl.handle.net/10550/40971
Chicago Manual of Style (16th Edition):
Gironés Delgado-Ureña, Zahara. “On implications of modified gravity models of dark energy
.” 2014. Doctoral Dissertation, Universitat de Valencia. Accessed January 27, 2021.
http://hdl.handle.net/10550/40971.
MLA Handbook (7th Edition):
Gironés Delgado-Ureña, Zahara. “On implications of modified gravity models of dark energy
.” 2014. Web. 27 Jan 2021.
Vancouver:
Gironés Delgado-Ureña Z. On implications of modified gravity models of dark energy
. [Internet] [Doctoral dissertation]. Universitat de Valencia; 2014. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/10550/40971.
Council of Science Editors:
Gironés Delgado-Ureña Z. On implications of modified gravity models of dark energy
. [Doctoral Dissertation]. Universitat de Valencia; 2014. Available from: http://hdl.handle.net/10550/40971
Anna University
13.
Kathirvel V.
Correlation between structural stability and electronic
structure of f Electron based intermetallic compounds under
pressure;.
Degree: 2013, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/10660
► In this thesis, an attempt has been made to correlate the structural stability and the electronic structure of several f-electron based intermetallic compounds (f-IMCs). The…
(more)
▼ In this thesis, an attempt has been made to
correlate the structural stability and the electronic structure of
several f-electron based intermetallic compounds (f-IMCs). The work
consists mainly of high pressure X-ray diffraction experiments,
electronic structure calculations along with the generation of
empirical 2-D structural stability maps. High pressure X-ray
diffraction experiments up to 30 GPa have been carried out. The
results show that UGa3 system is stable up to 30 GPa. Electronic
structure calculations have been carried out as function of reduced
volume up to 40 GPa. The results show that the Fermi level lies
very close to the maximum in the DOS curve. In order to validate
the result of 2-D maps, total energy of the system has been
calculated for hexagonal structure and compared with total energy
curve of cubic AuCu3 type structure. Although, the energies of
these two structures are very close, the total energy curve of
AuCu3 type structure lies below that of Ni3Sn. This comparison
shows that AuCu3 cubic type structure is more stable than Ni3Sn
(hexagonal) type structure. This may be due to the large range of
structural stability of AuCu3 type structures under pressure. In
order to understand the structural stability of LaAl2 and LaAl3
compounds, the band structure calculations as a function of reduced
volume have been carried out. The density of states of LaAl2
reveals that the EF lies in a slope between bonding maxima and
antibonding minima. The value almost equal to one is known as
condition for stability. And also, the value of Wocc/Wb do not show
any change under pressure in both the cases. The band dispersion
curves for both the compounds show movement to f bands under the
influence of pressure. Some of them cross the Fermi level leading
to so called Lifshitz transitions. However, it is seen that these
electronic changes do not manifest in any volume anomaly in the
compound under pressure. This may be due to the fact that the bands
touching the EF are mostly sp in nature with low density of
state
None
Advisors/Committee Members: Moorthy Babu, S..
Subjects/Keywords: Structural stability; electronic structure;
f-electron
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
V, K. (2013). Correlation between structural stability and electronic
structure of f Electron based intermetallic compounds under
pressure;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/10660
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
V, Kathirvel. “Correlation between structural stability and electronic
structure of f Electron based intermetallic compounds under
pressure;.” 2013. Thesis, Anna University. Accessed January 27, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/10660.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
V, Kathirvel. “Correlation between structural stability and electronic
structure of f Electron based intermetallic compounds under
pressure;.” 2013. Web. 27 Jan 2021.
Vancouver:
V K. Correlation between structural stability and electronic
structure of f Electron based intermetallic compounds under
pressure;. [Internet] [Thesis]. Anna University; 2013. [cited 2021 Jan 27].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/10660.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
V K. Correlation between structural stability and electronic
structure of f Electron based intermetallic compounds under
pressure;. [Thesis]. Anna University; 2013. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/10660
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
14.
Paulo Michel Longo Tavares da Silva.
Uma descrição da expansão e aceleração do universo no contexto das teorias f(R).
Degree: 2012, Universidade do Estado de Santa Catarina
URL: http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2713
;
http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2714
;
http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2715
;
http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2716
;
http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2717
;
http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2718
► Diante das observações experimentais da expansão cósmica acelerada, diversos - modelos teóricos surgiram para explicar a aceleração do Universo. Neste trabalho revisamos modelos tais como…
(more)
▼ Diante das observações experimentais da expansão cósmica acelerada, diversos - modelos teóricos surgiram para explicar a aceleração do Universo. Neste trabalho revisamos modelos tais como a constante cosmológica e quintessência, a qual é modelada por um campo escalar. O contexto aqui apresentado foi elaborado a partir das teorias modificadas da gravitação, também conhecidas como teorias f(R). Tal modelo é considerado uma generalização da ação de Einstein-Hilbert onde termos invariantes de curvatura podem descrever um regime acelerado para o universo. As equações de campo podem ser obtidas a partir de três formalismos distintos, a saber, formalismo métrico, Palatini e métrico-afim. Realizamos algumas manipulações algébricas para esses formalismos, bem como a apresentação das equações de Friedmann generalizadas para o formalismo métrico e Palatini. Também apresentamos um modelo no formalismo métrico com um campo de Maxwell acoplado minimamente. As equações de Friedmann-Maxwell-f(R), as quais dependem da forma funcional de f(R) como também do campo Fv, permitem que uma equação de estado para w pode ser ajustada em concordância com as medidas do red-shift de supernovas IA.
This work reviews concisely some of the theoretical attempts to explain the recently observed acceleration of the universe. Emphasis is put on the so-called theories f(R) which involve invariant modi.cations of the Einstein-Hilbert Lagrangian density. The pertinent .eld equations are derived from three distinct formalisms which are known in the literature as the metric formalism, the Palatini formalism and the a ne formalism. For the case of the metric and Palatini formalisms, we carry out some interesting calculations and show the corresponding versions of the Friedmann equations. In addition, we present a minimally coupled Friedmann-Maxwell-f(R) model which may give a cosmological equation of state for w that agrees with available measurements of the red-shift of Ia supernovae.
Advisors/Committee Members: Jorge Gonçalves Cardoso.
Subjects/Keywords: Teorias f(R); Energia Escura; Aceleração do universo; Acceleration of the universe; Dark energy; f (R) Theory; FISICA
Record Details
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Record Details
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« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Silva, P. M. L. T. d. (2012). Uma descrição da expansão e aceleração do universo no contexto das teorias f(R). (Thesis). Universidade do Estado de Santa Catarina. Retrieved from http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2713 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2714 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2715 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2716 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2717 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Silva, Paulo Michel Longo Tavares da. “Uma descrição da expansão e aceleração do universo no contexto das teorias f(R).” 2012. Thesis, Universidade do Estado de Santa Catarina. Accessed January 27, 2021.
http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2713 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2714 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2715 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2716 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2717 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Silva, Paulo Michel Longo Tavares da. “Uma descrição da expansão e aceleração do universo no contexto das teorias f(R).” 2012. Web. 27 Jan 2021.
Vancouver:
Silva PMLTd. Uma descrição da expansão e aceleração do universo no contexto das teorias f(R). [Internet] [Thesis]. Universidade do Estado de Santa Catarina; 2012. [cited 2021 Jan 27].
Available from: http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2713 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2714 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2715 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2716 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2717 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2718.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Silva PMLTd. Uma descrição da expansão e aceleração do universo no contexto das teorias f(R). [Thesis]. Universidade do Estado de Santa Catarina; 2012. Available from: http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2713 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2714 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2715 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2716 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2717 ; http://www.tede.udesc.br/tde_busca/arquivo.php?codArquivo=2718
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Cambridge
15.
Walker, Lisa Beth.
Inclusion in Practice: An explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms.
Degree: PhD, 2020, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/304576
► While access to secondary school is increasingly available to a larger and more heterogeneous population of learners, expansion in enrolment masks the reality that educational…
(more)
▼ While access to secondary school is increasingly available to a larger and more heterogeneous population of learners, expansion in enrolment masks the reality that educational inequalities are widening. Using a comparative and in-depth qualitative research design, this dissertation explores processes of educational inclusion and exclusion as they unfold within the classroom walls, where it is teachers who determine how access to the curriculum and classroom culture is created and sustained. Data generated through 12 lesson observations and accompanying stimulated recall interviews enable consideration of how patterns of teacher discourse influence teacher capacity to foster inclusivity, and why such patterns emerge. Data gathered through key informant interviews and focus group discussions support the scrutinization and triangulation of tentative findings drawn from the observation and stimulated recall data. This research is premised on the need to expand our knowledge of what inclusive education can mean in classrooms typically characterized by material and human deprivation, and in teaching approaches most often defined by a strong pedagogic tradition of knowledge transmission. The findings support the construction of an explanatory framework revealing the ways in which patterns of classroom discourse shape teacher capacity to foster inclusion in Tanzanian secondary school classrooms. They reveal the importance of three moments embedded within each teacher-student interaction: The moment within which a turn is allocated, the moment within which a student response is interpreted by a teacher, and the moment within which a teacher then follows up. The findings demonstrate the power of the multiple continua of discursive strategies within which teachers move, revealing the specific decisions and respective trade-offs which influence teacher capacity to foster processes of educational inclusion. The findings are significant for expanding our understanding of the intersection between pedagogy and inclusion in the Tanzanian context, generating insight into that which teachers do, the reasons for why they do it, and the contextually relevant levers for change.
Subjects/Keywords: inclusion; discourse analysis; Tanzania; Classroom-based discourse; I-R-F
Record Details
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Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Walker, L. B. (2020). Inclusion in Practice: An explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/304576
Chicago Manual of Style (16th Edition):
Walker, Lisa Beth. “Inclusion in Practice: An explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms.” 2020. Doctoral Dissertation, University of Cambridge. Accessed January 27, 2021.
https://www.repository.cam.ac.uk/handle/1810/304576.
MLA Handbook (7th Edition):
Walker, Lisa Beth. “Inclusion in Practice: An explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms.” 2020. Web. 27 Jan 2021.
Vancouver:
Walker LB. Inclusion in Practice: An explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Jan 27].
Available from: https://www.repository.cam.ac.uk/handle/1810/304576.
Council of Science Editors:
Walker LB. Inclusion in Practice: An explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://www.repository.cam.ac.uk/handle/1810/304576
University of Cambridge
16.
Walker, Lisa Beth.
Inclusion in practice : an explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms.
Degree: PhD, 2020, University of Cambridge
URL: https://doi.org/10.17863/CAM.51659
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805853
► While access to secondary school is increasingly available to a larger and more heterogeneous population of learners, expansion in enrolment masks the reality that educational…
(more)
▼ While access to secondary school is increasingly available to a larger and more heterogeneous population of learners, expansion in enrolment masks the reality that educational inequalities are widening. Using a comparative and in-depth qualitative research design, this dissertation explores processes of educational inclusion and exclusion as they unfold within the classroom walls, where it is teachers who determine how access to the curriculum and classroom culture is created and sustained. Data generated through 12 lesson observations and accompanying stimulated recall interviews enable consideration of how patterns of teacher discourse influence teacher capacity to foster inclusivity, and why such patterns emerge. Data gathered through key informant interviews and focus group discussions support the scrutinization and triangulation of tentative findings drawn from the observation and stimulated recall data. This research is premised on the need to expand our knowledge of what inclusive education can mean in classrooms typically characterized by material and human deprivation, and in teaching approaches most often defined by a strong pedagogic tradition of knowledge transmission. The findings support the construction of an explanatory framework revealing the ways in which patterns of classroom discourse shape teacher capacity to foster inclusion in Tanzanian secondary school classrooms. They reveal the importance of three moments embedded within each teacher-student interaction: The moment within which a turn is allocated, the moment within which a student response is interpreted by a teacher, and the moment within which a teacher then follows up. The findings demonstrate the power of the multiple continua of discursive strategies within which teachers move, revealing the specific decisions and respective trade-offs which influence teacher capacity to foster processes of educational inclusion. The findings are significant for expanding our understanding of the intersection between pedagogy and inclusion in the Tanzanian context, generating insight into that which teachers do, the reasons for why they do it, and the contextually relevant levers for change.
Subjects/Keywords: inclusion; discourse analysis; Tanzania; Classroom-based discourse; I-R-F
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Walker, L. B. (2020). Inclusion in practice : an explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms. (Doctoral Dissertation). University of Cambridge. Retrieved from https://doi.org/10.17863/CAM.51659 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805853
Chicago Manual of Style (16th Edition):
Walker, Lisa Beth. “Inclusion in practice : an explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms.” 2020. Doctoral Dissertation, University of Cambridge. Accessed January 27, 2021.
https://doi.org/10.17863/CAM.51659 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805853.
MLA Handbook (7th Edition):
Walker, Lisa Beth. “Inclusion in practice : an explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms.” 2020. Web. 27 Jan 2021.
Vancouver:
Walker LB. Inclusion in practice : an explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms. [Internet] [Doctoral dissertation]. University of Cambridge; 2020. [cited 2021 Jan 27].
Available from: https://doi.org/10.17863/CAM.51659 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805853.
Council of Science Editors:
Walker LB. Inclusion in practice : an explanatory study of how patterns of classroom discourse shape processes of educational inclusion in Tanzanian secondary school classrooms. [Doctoral Dissertation]. University of Cambridge; 2020. Available from: https://doi.org/10.17863/CAM.51659 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.805853
University of Pretoria
17.
McLagan, Toni Lisa.
Re[growth] :
a development of social capital through food network
accessibility.
Degree: MArch (Prof), Architecture, 2016, University of Pretoria
URL: http://hdl.handle.net/2263/60188
► Die verhandeling is gerig op die toenemende globale kwessie van ons land se voedselonsekerheid en die faktore wat daartoe bydra. Dit ondersoek die rol wat…
(more)
▼ Die verhandeling is gerig op die toenemende globale
kwessie van ons land se voedselonsekerheid en die
faktore wat
daartoe bydra.
Dit ondersoek die rol wat argitektuur kan speel as
'n
sistemiese instrument (in die vorm van 'n gastronomiese
kwartaal) vir die her[groei] van 'n hoogs omstrede
kwessie. Deur
die identifisering van globale en plaaslike
omstandighede word
voedselsekerheid bemagtiging
ontwikkel deur die integrasie van
sosio-ekonomiese
stelsels wat optree as punte van akupunktuur om
kontekstuele omstandighede te verbeter.
Deur 'n nuut gevormde
argitektoniese benadering
waardeur kos en die toeganklikheid
daarvan die basis
vorm van sosiale inklusiwiteit, word verskeie
mense in die
samelewing bemagtig deur van plaaslike ondersteuning
gebruik te maak. Plaaslike ondersteuning is van kardinale
belang
vir die groei en bemagtiging van 'n gemeenskap,
wat 'n positiewe
impak op die algehele stedelike
moraliteit of weefsel het deur die
voorsiening van 'n meer
inklusiewe omgewing vir die bemagtiging
van daardie
V. gemeenskap.
Advisors/Committee Members: Combrinck, Carin (advisor).
Subjects/Keywords: UCTD; F o o d i n s
e c u r i t y; In f o r m a l
t r a d e; Food
network; A s t r o n o
m i c q u a r t e r
Record Details
Similar Records
Cite
Share »
Record Details
Similar Records
Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
McLagan, T. L. (2016). Re[growth] :
a development of social capital through food network
accessibility. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/60188
Chicago Manual of Style (16th Edition):
McLagan, Toni Lisa. “Re[growth] :
a development of social capital through food network
accessibility.” 2016. Masters Thesis, University of Pretoria. Accessed January 27, 2021.
http://hdl.handle.net/2263/60188.
MLA Handbook (7th Edition):
McLagan, Toni Lisa. “Re[growth] :
a development of social capital through food network
accessibility.” 2016. Web. 27 Jan 2021.
Vancouver:
McLagan TL. Re[growth] :
a development of social capital through food network
accessibility. [Internet] [Masters thesis]. University of Pretoria; 2016. [cited 2021 Jan 27].
Available from: http://hdl.handle.net/2263/60188.
Council of Science Editors:
McLagan TL. Re[growth] :
a development of social capital through food network
accessibility. [Masters Thesis]. University of Pretoria; 2016. Available from: http://hdl.handle.net/2263/60188
18.
Lao, Yizhen.
3D Vision Geometry for Rolling Shutter Cameras : Géométrie pour la vision 3D avec des caméras Rolling Shutter.
Degree: Docteur es, Vision pour la Robotique, 2019, Clermont Auvergne
URL: http://www.theses.fr/2019CLFAC009
► De nombreuses caméras CMOS modernes sont équipées de capteurs Rolling Shutter (RS). Ces caméras à bas coût et basse consommation permettent d’atteindre de très hautes…
(more)
▼ De nombreuses caméras CMOS modernes sont équipées
de capteurs Rolling Shutter (RS). Ces caméras à bas coût et basse consommation permettent d’atteindre
de très hautes fréquences d’acquisition. Dans ce mode d’acquisition, les lignes
de pixels sont exposées séquentiellement du haut vers le bas
de l'image. Par conséquent, les images capturées alors que la caméra et/ou la scène est en mouvement présentent des distorsions qui rendent les algorithmes classiques au mieux moins précis, au pire inutilisables en raison
de singularités ou
de configurations dégénérées. Le but
de cette thèse est
de revisiter la géométrie
de la vision 3D avec des caméras RS en proposant des solutions pour chaque sous-tâche du pipe-line
de Structure-from-Motion (SfM).Le chapitre II présente une nouvelle méthode
de correction du RS en utilisant les droites. Contrairement aux méthodes existantes, qui sont itératives et font l’hypothèse dite Manhattan World (MW), notre solution est linéaire et n’impose aucune contrainte sur l’orientation des droites 3D.
De plus, la méthode est intégrée dans un processus
de type RANSAC permettant
de distinguer les courbes qui sont des projections
de segments droits
de celles qui correspondent à
de vraies courbes 3D. La méthode
de correction est ainsi plus robuste et entièrement automatisée.Le chapitre III revient sur l'ajustement faisceaux ou bundle adjustment (BA). Nous proposons un nouvel algorithme basé sur une erreur
de projection dans laquelle l’index
de ligne des points projetés varie pendant l’optimisation afin
de garder une cohé
rence géométrique contrairement aux méthodes existantes qui considère un index fixe (celui mesurés dans l’image). Nous montrons que cela permet
de lever la dégénérescence dans le cas où les directions
de scan des images sont trop proches (cas très communs avec des caméras embraquées sur un véhicule par exemple). Dans le chapitre VI nous étendons le concept d'homographie aux cas d’images RS en démontrant que la relation point-à-point entre deux images d’un nuage
de points coplanaires pouvait s’exprimer sous la forme
de 3 à 7 matrices
de taille 3X3 en fonction du modèle
de mouvement utilisé. Nous proposons une méthode linéaire pour le calcul
de ces matrices. Ces dernières sont ensuite utilisées pour résoudre deux problèmes classiques en vision par ordinateur à savoir le calcul du mouvement relatif et le « mosaïcing » dans le cas RS.Dans le chapitre V nous traitons le problème
de calcul
de pose et
de reconstruction multi-vues en établissant une analogie avec les méthodes utilisées pour les surfaces déformables telles que SfT (
Structure-from-Template) et NRSfM (Non Rigid
Structure-from-Motion). Nous montrons qu’une image RS d’une scène rigide en mouvement peut être interprétée comme une image Global Shutter (GS) d’une surface virtuellement déformée (par l’effet RS). La solution proposée pour estimer la pose et la
structure 3D
de la scène est ainsi composée
de deux étapes. D’abord les déformations virtuelles sont d’abord calculées grâce à SfT ou NRSfM en assumant un modèle GS classique…
Advisors/Committee Members: Araújo, Helder (thesis director), Ait Aider, Omar (thesis director).
Subjects/Keywords: Rolling shutter; Pose absolue et relative; Homographie; S-f-M; Ajustement de faisceaux; Rolling shutter; Image correction; Pose estimation; Relative pose estimation; Homography; Structure from Motion; Bundle Adjustment
Record Details
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Share »
Record Details
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Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lao, Y. (2019). 3D Vision Geometry for Rolling Shutter Cameras : Géométrie pour la vision 3D avec des caméras Rolling Shutter. (Doctoral Dissertation). Clermont Auvergne. Retrieved from http://www.theses.fr/2019CLFAC009
Chicago Manual of Style (16th Edition):
Lao, Yizhen. “3D Vision Geometry for Rolling Shutter Cameras : Géométrie pour la vision 3D avec des caméras Rolling Shutter.” 2019. Doctoral Dissertation, Clermont Auvergne. Accessed January 27, 2021.
http://www.theses.fr/2019CLFAC009.
MLA Handbook (7th Edition):
Lao, Yizhen. “3D Vision Geometry for Rolling Shutter Cameras : Géométrie pour la vision 3D avec des caméras Rolling Shutter.” 2019. Web. 27 Jan 2021.
Vancouver:
Lao Y. 3D Vision Geometry for Rolling Shutter Cameras : Géométrie pour la vision 3D avec des caméras Rolling Shutter. [Internet] [Doctoral dissertation]. Clermont Auvergne; 2019. [cited 2021 Jan 27].
Available from: http://www.theses.fr/2019CLFAC009.
Council of Science Editors:
Lao Y. 3D Vision Geometry for Rolling Shutter Cameras : Géométrie pour la vision 3D avec des caméras Rolling Shutter. [Doctoral Dissertation]. Clermont Auvergne; 2019. Available from: http://www.theses.fr/2019CLFAC009
19.
Aberkane, Idriss Jamil.
Ballade de la conscience entre Orient et Occident : une perspective soufie sur la conscience occidentale, connectant "The Kasidah" de R.F. Burton et "The Waste Land" de T.S. Eliot : Ballad of consciousness between East and West : a Sufi perspective on the Western consciousness, connecting R. F. Burton's Kasidah and T. S. Eliot's Waste Land.
Degree: Docteur es, Littérature générale et comparée, 2014, Université de Strasbourg
URL: http://www.theses.fr/2014STRAC005
► Le rapprochement du Waste Land de T. S. Eliot et de la Kasidah de R. F. Burton produit une théorie littéraire. Cette théorie est fondée…
(more)
▼ Le rapprochement du Waste Land de T. S. Eliot et de la Kasidah de R. F. Burton produit une théorie littéraire. Cette théorie est fondée sur le principe de l'Unité de la Conscience (Wahdat al Wayy) d'après l'exégèse d'Ibn Arabi (Wahdat al Wujud et Wahdat al Adyân). Elle postule également que toute vie n'est qu'un courant de conscience. L'action est une forme d'écriture de la conscience dans le monde, et l'expérience vécue est une forme d'écriture du monde dans la conscience. Or l'expression de la conscience en perspective est un invariant profond des littératures, qui relie The Waste Land et The Kasidah mais également Al Aaraaf de Poe, le Voyage de Baudelaire, le Testament de Villon ou encore le Canto Notturno de Leopardi. Un autre invariant, fondé par le précédent, est l'invariant de la gâtine, que l'on peut résumer par le mythe de l'Ortolano Eterno : Homo : locatus est, damnatus est, humatus est, renatus est : in Horto. Or la Septième sourate du Coran est une expression notable de l'invariant de la gâtine. Ainsi comme il existe une cartographie dynamique des connexions cérébrales, la connectomique, il existe une connectomique des littératures et une biologie des littératures. Une partie du corps calleux des littératures, le faisceau de connexions directes entre Orient et Occident, est la "chaîne de la gâtine", un linéament de textes qui se fascinent pour l'interaction entre le monde et la conscience. Concernant Eliot, ses influences soufies directes vont de Omar Khayyam à Guénon ou Schuon, et ses influences indirectes relèvent de l'influence soufie sur les troubadours. Eliot influence lui-même la poésie de l'aire musulmane depuis au moins 1950.
Connecting T. S. Eliot's Waste Land to R. F. Burton's Kasidah produces a literary theory. The founding principle of this theory is the Unity of Consciousness (Wahdat al Wayy), after the exegesis of Ibn Arabi (Wahdat al Wujud and Wahdat al Adyan). It also postulates that any life is but a stream of consciousness. Action is thus the way by which consciousness writes in the world, and experience is the way the world writes in consciousness. The expression of consciousness in perspective is in turn a profound literary invariant, connecting The Waste Land and The Kasidah but also Poe's Al Aaraaf, Baudelaire's Voyage, Villon's Testament or Leopardi's Canto Notturno. Another invariant, based on the precedent, is the invariant of the wasteland, which can be summed up by the myth of the Ortolano Eterno : Homo : locatus est, damnatus est, humatus est, renatus est : in Horto. Now the seventh surah of the Quran is a notable expression of the invariant of the wasteland. In the same way that there is a connectomics of the human brain, there is a connectomics and also a biology of literatures. A sample of its corpus callosum, connecting the Western and Eastern literatures, is the "chain of the wasteland", a lineament of texts which leitmotiv is the interaction between consciousness and the world. Regarding Eliot his direct sufi influences range from Omar Khayyam to Guénon and Schuon, and…
Advisors/Committee Members: Geoffroy, Éric (thesis director), Laude, Patrick (thesis director).
Subjects/Keywords: T. S. Eliot; R. F. Burton; Soufisme; Conscience; Qasîda; Mémoire biographique; T. S. Eliot; R. F. Burton; Sufism; Consciousness; Kasidah; Biographical memory; 809.1; 821; 892.7
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APA ·
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APA (6th Edition):
Aberkane, I. J. (2014). Ballade de la conscience entre Orient et Occident : une perspective soufie sur la conscience occidentale, connectant "The Kasidah" de R.F. Burton et "The Waste Land" de T.S. Eliot : Ballad of consciousness between East and West : a Sufi perspective on the Western consciousness, connecting R. F. Burton's Kasidah and T. S. Eliot's Waste Land. (Doctoral Dissertation). Université de Strasbourg. Retrieved from http://www.theses.fr/2014STRAC005
Chicago Manual of Style (16th Edition):
Aberkane, Idriss Jamil. “Ballade de la conscience entre Orient et Occident : une perspective soufie sur la conscience occidentale, connectant "The Kasidah" de R.F. Burton et "The Waste Land" de T.S. Eliot : Ballad of consciousness between East and West : a Sufi perspective on the Western consciousness, connecting R. F. Burton's Kasidah and T. S. Eliot's Waste Land.” 2014. Doctoral Dissertation, Université de Strasbourg. Accessed January 27, 2021.
http://www.theses.fr/2014STRAC005.
MLA Handbook (7th Edition):
Aberkane, Idriss Jamil. “Ballade de la conscience entre Orient et Occident : une perspective soufie sur la conscience occidentale, connectant "The Kasidah" de R.F. Burton et "The Waste Land" de T.S. Eliot : Ballad of consciousness between East and West : a Sufi perspective on the Western consciousness, connecting R. F. Burton's Kasidah and T. S. Eliot's Waste Land.” 2014. Web. 27 Jan 2021.
Vancouver:
Aberkane IJ. Ballade de la conscience entre Orient et Occident : une perspective soufie sur la conscience occidentale, connectant "The Kasidah" de R.F. Burton et "The Waste Land" de T.S. Eliot : Ballad of consciousness between East and West : a Sufi perspective on the Western consciousness, connecting R. F. Burton's Kasidah and T. S. Eliot's Waste Land. [Internet] [Doctoral dissertation]. Université de Strasbourg; 2014. [cited 2021 Jan 27].
Available from: http://www.theses.fr/2014STRAC005.
Council of Science Editors:
Aberkane IJ. Ballade de la conscience entre Orient et Occident : une perspective soufie sur la conscience occidentale, connectant "The Kasidah" de R.F. Burton et "The Waste Land" de T.S. Eliot : Ballad of consciousness between East and West : a Sufi perspective on the Western consciousness, connecting R. F. Burton's Kasidah and T. S. Eliot's Waste Land. [Doctoral Dissertation]. Université de Strasbourg; 2014. Available from: http://www.theses.fr/2014STRAC005
20.
Saneesh, Sebastian.
Studies on scattering and thermodynamics of black holes in f(R) theory and Einstein's theory.
Degree: 2014, Cochin University of Science and Technology
URL: http://dyuthi.cusat.ac.in/purl/4979
► One of the interesting consequences of Einstein's General Theory of Relativity is the black hole solutions. Until the observation made by Hawking in 1970s, it…
(more)
▼ One of the interesting consequences of Einstein's General Theory of Relativity is the black hole solutions. Until the observation made by Hawking in 1970s, it was believed that black holes are perfectly black. The General Theory of Relativity says that black holes are objects which absorb both matter and radiation crossing the event horizon. The event horizon is a surface through which even light is not able to escape. It acts as a one sided membrane that allows the passage of particles only in one direction i.e. towards the center of black holes. All the particles that are absorbed by black hole increases the mass of the black hole and thus the size of event horizon also increases. Hawking showed in 1970s that when applying quantum mechanical laws to black holes they are not perfectly black but they can emit radiation. Thus the black hole can have temperature known as Hawking temperature. In the thesis we have studied some aspects of black holes in f(R) theory of gravity and Einstein's General Theory of Relativity. The scattering of scalar field in this background space time studied in the first chapter shows that the extended black hole will scatter scalar waves and have a scattering cross section and applying tunneling mechanism we have obtained the Hawking temperature of this black hole. In the following chapter we have investigated the quasinormal properties of the extended black hole. We have studied the electromagnetic and scalar perturbations in this space-time and find that the black hole frequencies are complex and show exponential damping indicating the black hole is stable against the perturbations. In the present study we show that not only the black holes exist in modified gravities but also they have similar properties of black hole space times in General Theory of Relativity. 2 + 1 black holes or three dimensional black holes are simplified examples of more complicated four dimensional black holes. Thus these models of black holes are known as toy models of black holes in four dimensional black holes in General theory of Relativity. We have studied some properties of these types of black holes in Einstein model (General Theory of Relativity). A three dimensional black hole known as MSW is taken for our study. The thermodynamics and spectroscopy of MSW black hole are studied and obtained the area spectrum which is equispaced and
different thermo dynamical properties are studied. The Dirac perturbation of this three dimensional black hole is studied and the resulting quasinormal spectrum of this three dimensional black hole is obtained. The different quasinormal frequencies are tabulated in tables and these values show an exponential damping of oscillations indicating the black hole is stable against the mass less Dirac perturbation. In General Theory of Relativity almost all solutions contain singularities. The cosmological solution and different black hole solutions of Einstein's field equation contain singularities. The regular black hole solutions are those which are solutions of Einstein's equation…
Subjects/Keywords: Black holes; Characteristics of black holes; Scattering of scalar eld; f(R) gravity
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APA ·
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APA (6th Edition):
Saneesh, S. (2014). Studies on scattering and thermodynamics of black holes in f(R) theory and Einstein's theory. (Thesis). Cochin University of Science and Technology. Retrieved from http://dyuthi.cusat.ac.in/purl/4979
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Saneesh, Sebastian. “Studies on scattering and thermodynamics of black holes in f(R) theory and Einstein's theory.” 2014. Thesis, Cochin University of Science and Technology. Accessed January 27, 2021.
http://dyuthi.cusat.ac.in/purl/4979.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Saneesh, Sebastian. “Studies on scattering and thermodynamics of black holes in f(R) theory and Einstein's theory.” 2014. Web. 27 Jan 2021.
Vancouver:
Saneesh S. Studies on scattering and thermodynamics of black holes in f(R) theory and Einstein's theory. [Internet] [Thesis]. Cochin University of Science and Technology; 2014. [cited 2021 Jan 27].
Available from: http://dyuthi.cusat.ac.in/purl/4979.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Saneesh S. Studies on scattering and thermodynamics of black holes in f(R) theory and Einstein's theory. [Thesis]. Cochin University of Science and Technology; 2014. Available from: http://dyuthi.cusat.ac.in/purl/4979
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Hyderabad
21.
Sridhar, M.
Language, criticism and culture: organic community in F R
Leavis.
Degree: 1996, University of Hyderabad
URL: http://shodhganga.inflibnet.ac.in/handle/10603/1804
Subjects/Keywords: Organic community; English, F R Levis
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APA ·
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APA (6th Edition):
Sridhar, M. (1996). Language, criticism and culture: organic community in F R
Leavis. (Thesis). University of Hyderabad. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/1804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sridhar, M. “Language, criticism and culture: organic community in F R
Leavis.” 1996. Thesis, University of Hyderabad. Accessed January 27, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/1804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sridhar, M. “Language, criticism and culture: organic community in F R
Leavis.” 1996. Web. 27 Jan 2021.
Vancouver:
Sridhar M. Language, criticism and culture: organic community in F R
Leavis. [Internet] [Thesis]. University of Hyderabad; 1996. [cited 2021 Jan 27].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/1804.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sridhar M. Language, criticism and culture: organic community in F R
Leavis. [Thesis]. University of Hyderabad; 1996. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/1804
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
22.
Sierlecki, Bonnie J.
Fit for Democracy: Sport and Presidential Rhetoric.
Degree: 2015, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/24827
► This dissertation examines some of the ways in which presidential rhetoric about sport and athleticism has functioned historically to constitute both our ideals of citizenship…
(more)
▼ This dissertation examines some of the ways in which presidential rhetoric about sport and athleticism has functioned historically to constitute both our ideals of citizenship and the presidency itself. Because sport and physicality have become rhetorically linked to modern notions of what it means to be "presidential," modern presidents deploy rhetorics of sport and sports fandom to help define civic virtue and the ideal citizen. They also use rhetorics of sport to advance their own political identity and policy agendas. Understanding the different ways in which presidents and presidential candidates have rhetorically engaged sport helps illuminate both the gendered nature of presidential character and our understanding of how ideas about “good citizenship” are constituted. Through four case studies, I illustrate how presidents (or, in one case, a presidential candidate) have used rhetorics of sport and physicality to define or bolster their own image, promote core American values and particular conceptions of citizenship, and advance political or policy agendas.
Advisors/Committee Members: James Hogan, Dissertation Advisor/Co-Advisor, Thomas Walter Benson, Committee Member, Kirtley Hasketh Wilson, Committee Member, Marie Hardin, Committee Member.
Subjects/Keywords: Sport; physical fitness; presidential rhetoric; Theodore Roosevelt; John F. Kennedy; Gerald R. Ford; Barack Obama
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APA ·
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Export
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APA (6th Edition):
Sierlecki, B. J. (2015). Fit for Democracy: Sport and Presidential Rhetoric. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/24827
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sierlecki, Bonnie J. “Fit for Democracy: Sport and Presidential Rhetoric.” 2015. Thesis, Penn State University. Accessed January 27, 2021.
https://submit-etda.libraries.psu.edu/catalog/24827.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sierlecki, Bonnie J. “Fit for Democracy: Sport and Presidential Rhetoric.” 2015. Web. 27 Jan 2021.
Vancouver:
Sierlecki BJ. Fit for Democracy: Sport and Presidential Rhetoric. [Internet] [Thesis]. Penn State University; 2015. [cited 2021 Jan 27].
Available from: https://submit-etda.libraries.psu.edu/catalog/24827.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sierlecki BJ. Fit for Democracy: Sport and Presidential Rhetoric. [Thesis]. Penn State University; 2015. Available from: https://submit-etda.libraries.psu.edu/catalog/24827
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Notre Dame
23.
Charles Hamlin Pence.
Chance in Evolutionary Theory: Fitness, Selection, and
Genetic Drift in Philosophical and Historical
Perspective</h1>.
Degree: History and Philosophy of Science, 2014, University of Notre Dame
URL: https://curate.nd.edu/show/5d86nz8232t
► Discussions of the foundations of evolutionary theory – especially natural selection, fitness, and genetic drift – are saturated with terms referring to various kinds…
(more)
▼ Discussions of the foundations of
evolutionary theory – especially natural selection, fitness, and
genetic drift – are saturated with terms referring to various kinds
of chance, stochasticity, randomness, unpredictability, and so
forth. This dissertation examines these uses of chance in
philosophical and historical perspective. I
begin by arguing that, both in the contemporary and historical
arenas, the current state of the literature on chance is deeply
troubling. Work in the philosophy of biology (i) often conflates
various clearly distinct notions of chance, and (ii) often
approaches the analysis of chance from the perspective of a debate
(on the causal potency of natural selection and genetic drift) that
does not in fact profitably engage evolutionary theory.
Historically, as well, the most common way of analyzing the
development of the use of chance in evolutionary theory does not
engage the actual research of historical actors, a point I make by
exploring the work of Karl Pearson and W.
F.
R. Weldon at the turn of
the twentieth century. I thus propose a new
guiding question for research into the role of chance in
evolutionary theory: what is the relationship between our
statistical biological theories and the processes in the world
those theories aim to describe? I then offer a novel framework for
determining the answer to this question, derived from a deeply
biologically-informed understanding of fitness, selection, and
drift. This view combines core insights from work in philosophy on
the propensity interpretation of fitness with cutting-edge
biological treatments of population modeling. Chance enters this
model at only a single point – the distribution over the various
possible lives that an organism might live – and this single source
can explain the influence of chance throughout fitness, natural
selection, and genetic drift. This framework, I claim, constitutes
a fruitful way to understand both the foundations of evolutionary
theory and the role of chance in those
foundations.
Advisors/Committee Members: Grant Ramsey, Committee Chair, Ted A. Warfield, Committee Member, Phillip R. Sloan, Committee Member, Anjan Chakravartty, Committee Member.
Subjects/Keywords: fitness; Karl Pearson; chance; W. F. R. Weldon; randomness; evolutionary theory; genetic drift; natural selection
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APA ·
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APA (6th Edition):
Pence, C. H. (2014). Chance in Evolutionary Theory: Fitness, Selection, and
Genetic Drift in Philosophical and Historical
Perspective</h1>. (Thesis). University of Notre Dame. Retrieved from https://curate.nd.edu/show/5d86nz8232t
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Pence, Charles Hamlin. “Chance in Evolutionary Theory: Fitness, Selection, and
Genetic Drift in Philosophical and Historical
Perspective</h1>.” 2014. Thesis, University of Notre Dame. Accessed January 27, 2021.
https://curate.nd.edu/show/5d86nz8232t.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Pence, Charles Hamlin. “Chance in Evolutionary Theory: Fitness, Selection, and
Genetic Drift in Philosophical and Historical
Perspective</h1>.” 2014. Web. 27 Jan 2021.
Vancouver:
Pence CH. Chance in Evolutionary Theory: Fitness, Selection, and
Genetic Drift in Philosophical and Historical
Perspective</h1>. [Internet] [Thesis]. University of Notre Dame; 2014. [cited 2021 Jan 27].
Available from: https://curate.nd.edu/show/5d86nz8232t.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Pence CH. Chance in Evolutionary Theory: Fitness, Selection, and
Genetic Drift in Philosophical and Historical
Perspective</h1>. [Thesis]. University of Notre Dame; 2014. Available from: https://curate.nd.edu/show/5d86nz8232t
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
24.
Benya, Frazier.
Biomedical advances confront society:congressional hearings and the development of bioethics, 1960-1975.
Degree: PhD, 2012, University of Minnesota
URL: http://purl.umn.edu/141246
► In 1974 the first federal bioethics commission was created to examine the ethics and policies on biomedical research with human subjects. The idea of having…
(more)
▼ In 1974 the first federal bioethics commission was created to examine the ethics and policies on biomedical research with human subjects. The idea of having a federal bioethics commission has continued since, with new presidents creating new commissions to replace their predecessor's commission. Six years before the first commission was created, Senator Walter Mondale proposed for the first time the idea of such a commission, which would examine the ethics and social implications of a wide range of biomedical research topics in an interdisciplinary manner. This dissertation specifically examines how the federal government became an influential venue for discussing bioethics and identifying ethical, social, and legal issues with research, and how social implications concerns developed and became part of bioethics. It reveals how during the 1960s those inside and outside biomedical research identified bioethical issues and debated their social responsibility, and how Congress become increasingly interested in the research that they were funding as well as in its implications on society. Throughout the chapters this dissertation follows the development of the field of bioethics, adding on to it with the history of the government's role in bioethics and with the details of social implications concerns that were distinct from concerns over medical ethics or human experimentation ethics. I argue that three key senators, Walter F. Mondale (D-MN), Fred Harris (D-OK), and Edward Kennedy (D-MA), worked with and also challenged the assertions of physicians and researchers on the need to examine social consequences of biomedicine, and in that process they dramatically reshaped the involvement of non-scientists and non-physicians in discussions of biomedical research. These Senators also brought public attention to difficult issues in biomedicine and established a public realm for bioethics discussions.
Subjects/Keywords: Bioethics; Fred R. Harris; National Commission; Social Implications; Social Responsibility; Walter F. Mondale
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APA ·
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APA (6th Edition):
Benya, F. (2012). Biomedical advances confront society:congressional hearings and the development of bioethics, 1960-1975. (Doctoral Dissertation). University of Minnesota. Retrieved from http://purl.umn.edu/141246
Chicago Manual of Style (16th Edition):
Benya, Frazier. “Biomedical advances confront society:congressional hearings and the development of bioethics, 1960-1975.” 2012. Doctoral Dissertation, University of Minnesota. Accessed January 27, 2021.
http://purl.umn.edu/141246.
MLA Handbook (7th Edition):
Benya, Frazier. “Biomedical advances confront society:congressional hearings and the development of bioethics, 1960-1975.” 2012. Web. 27 Jan 2021.
Vancouver:
Benya F. Biomedical advances confront society:congressional hearings and the development of bioethics, 1960-1975. [Internet] [Doctoral dissertation]. University of Minnesota; 2012. [cited 2021 Jan 27].
Available from: http://purl.umn.edu/141246.
Council of Science Editors:
Benya F. Biomedical advances confront society:congressional hearings and the development of bioethics, 1960-1975. [Doctoral Dissertation]. University of Minnesota; 2012. Available from: http://purl.umn.edu/141246
Syracuse University
25.
Na, Sang Gon.
Essays on Testing Hypotheses When Non-stationarity Exists in Panel Data Models.
Degree: PhD, Economics, 2011, Syracuse University
URL: https://surface.syr.edu/ecn_etd/87
► This dissertation consists of two essays on testing hypotheses in panel data models when non-stationarity exists in the model. This is done under the…
(more)
▼ This dissertation consists of two essays on testing hypotheses in panel data models when non-stationarity exists in the model. This is done under the high-dimensional framework where both n (cross-section dimension) and T (time series dimension) are large. In the first essay, I discuss the limiting distribution of the t-statistic; using different panel data estimators and propose using the t-statistic based on Feasible GLS estimator. In the second essay, I develop the bootstrap
F-statistic for cross-sectional independence in a panel data model with factor
structure.
The first essay considers the problem of hypotheses testing in a simple panel data regression model with random individual effects and serially correlated disturbances. Following Baltagi, Kao and Liu (2008), I allow for the possibility of non-stationarity in the regressor and/or the disturbance term. While Baltagi et al. (2008) focus on the asymptotic properties and distributions of the standard panel data estimators, this essay focuses on test of hypotheses in this setting. One important finding, is that unlike the time series case, one does not necessarily need to rely on the "super-efficient" type AR estimator by Perron and Yabu (2009) to make inference in panel data. In fact, I show that the simple t-ratio always converges to the standard normal distribution regardless of whether the disturbances and/or the regressor are stationary. One caveat is that this may not be robust to heteroskedasticity of the error terms, but it is robust to heterogenous AR parameters across individuals. The Monte Carlo simulations in support of all the results are also provided in this essay.
The second essay discusses testing hypotheses of cross-sectional dependence in a panel data model with an introduction of factor
structure. Following Bai (2003, 2004, 2009) and Bai, Kao and Ng (2009), I again allow for the possibility of non-stationarity in the regressor and the factor. I give attention to test of hypotheses using
F-tests in this setting. The limiting distribution of
F-statistics under the high-dimensional framework has not been derived yet in the literature perhaps because of its theoretical complexity. To circumvent this difficulty, this essay suggests the use of wild bootstrap
F-tests based on simulation results under various cases where both regressors and factors can be stationary or non-stationary. The Monte Carlo results show that the bootstrap
F-tests perform well in testing cross-sectional independence and are recommended in practice. They have the advantage of being feasible even when we do not observe the factors and do not require for formal theoretical approximations. It is also shown that the bootstrap
F-tests are robust to heteroskedasticity but sensitive to serial correlation.
Advisors/Committee Members: Chihwa Kao.
Subjects/Keywords: Panel data; Feasible GLS estimator; F-statistic; Factor structure; Economics
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APA ·
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MLA ·
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APA (6th Edition):
Na, S. G. (2011). Essays on Testing Hypotheses When Non-stationarity Exists in Panel Data Models. (Doctoral Dissertation). Syracuse University. Retrieved from https://surface.syr.edu/ecn_etd/87
Chicago Manual of Style (16th Edition):
Na, Sang Gon. “Essays on Testing Hypotheses When Non-stationarity Exists in Panel Data Models.” 2011. Doctoral Dissertation, Syracuse University. Accessed January 27, 2021.
https://surface.syr.edu/ecn_etd/87.
MLA Handbook (7th Edition):
Na, Sang Gon. “Essays on Testing Hypotheses When Non-stationarity Exists in Panel Data Models.” 2011. Web. 27 Jan 2021.
Vancouver:
Na SG. Essays on Testing Hypotheses When Non-stationarity Exists in Panel Data Models. [Internet] [Doctoral dissertation]. Syracuse University; 2011. [cited 2021 Jan 27].
Available from: https://surface.syr.edu/ecn_etd/87.
Council of Science Editors:
Na SG. Essays on Testing Hypotheses When Non-stationarity Exists in Panel Data Models. [Doctoral Dissertation]. Syracuse University; 2011. Available from: https://surface.syr.edu/ecn_etd/87
26.
Sauget, Jeremie.
Contribution à l'étude des films minces SiOxNy nanostructurés destinés à des empilements antireflets : Contribution to the study of nanostructured SiOxNy thin films for antireflection coating.
Degree: Docteur es, Sciences pour l'ingénieur, 2014, Besançon
URL: http://www.theses.fr/2014BESA2057
► Le but de ce travail de recherche a été d’une part, de contrôler le procédé d’élaboration decouches minces d’oxynitrures de silicium par pulvérisation cathodique réactive…
(more)
▼ Le but de ce travail de recherche a été d’une part, de contrôler le procédé d’élaboration decouches minces d’oxynitrures de silicium par pulvérisation cathodique réactive à partir d’une ciblede silicium ; et d'autre part, de déterminer les caractéristiques structurelles et optiques de cescouches minces pour réaliser des multicouches à propriétés antireflets dans le visible. Des films deSiNy et SiOx ont été élaborés et étudiés selon trois procédés de pulvérisation cathodique réactive. Legaz réactif a été introduit soit en continu (procédé convention : CP), soit périodiquement selon uncréneau exponentiel (procédé RGPP). Le troisième procédé de pulvérisation repose sur l'orientationdu substrat dans l'espace tandis que la source de vapeur reste fixe (technique GLAD). Les analysespar spectroscopie d’électrons et par microscopie électronique ont permis de déterminer lacomposition chimique et la morphologie des films. Les caractéristiques optiques ont étédéterminées par spectroscopie UV-visible-PIR. De plus, des simulations numériques sur lespropriétés fondamentales des structures du nitrure et de l'oxyde de silicium ont été effectuées pouressayer de mieux appréhender les comportements optiques de ces films. Au final, ces travaux ontpermis l'élaboration et l'étude d'empilements multicouches SiNy/SiOx à propriétés antireflets dansles longueurs d'onde du visible sur différents substrats.
This work aims at controlling the deposition process of silicon oxynitride thin films by reactivesputtering from a silicon target. It is also focused on some correlations between structural andoptical properties of the films in order to produce antireflective multilayers. SiNy and SiOx films aresputter deposited by three different reactive processes. A continuous reactive gas injection(conventional process: CP) or a periodical supply by means of exponential pulses is implemented(RGPP process). The third process is based on a controlled orientation of the substrate (GLADtechnique). These films are analyzed by electronic spectroscopy and electronic microscopy forcomposition and morphology, respectively. The optical properties are determined by UV-Vis-IRspectroscopy. Moreover, theoretical simulations on structural silicon nitride and oxide areperformed so as to better understand optical properties of the films. Last but not least, this workleads to the growth and study of SiNy/SiOx antireflective multilayers used in the visible range anddeposited on different kind of substrates.
Advisors/Committee Members: Martin, Nicolas (thesis director), Duverger, Eric (thesis director), Rousselot, Christophe (thesis director).
Subjects/Keywords: Oxynitrures de silicium; Couches minces; Pulvérisation cathodique réactive RF; RGPP; GLAD; Propriétés stucturales; Propriétés optiques; Multicouches anti-reflets; Silicon oxynitride; Thin films; Réactivfe R F sputtering; RGPP; GLAD; Stuctural properties; Optical simulations; Antireflective multilayers; 541.3
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APA (6th Edition):
Sauget, J. (2014). Contribution à l'étude des films minces SiOxNy nanostructurés destinés à des empilements antireflets : Contribution to the study of nanostructured SiOxNy thin films for antireflection coating. (Doctoral Dissertation). Besançon. Retrieved from http://www.theses.fr/2014BESA2057
Chicago Manual of Style (16th Edition):
Sauget, Jeremie. “Contribution à l'étude des films minces SiOxNy nanostructurés destinés à des empilements antireflets : Contribution to the study of nanostructured SiOxNy thin films for antireflection coating.” 2014. Doctoral Dissertation, Besançon. Accessed January 27, 2021.
http://www.theses.fr/2014BESA2057.
MLA Handbook (7th Edition):
Sauget, Jeremie. “Contribution à l'étude des films minces SiOxNy nanostructurés destinés à des empilements antireflets : Contribution to the study of nanostructured SiOxNy thin films for antireflection coating.” 2014. Web. 27 Jan 2021.
Vancouver:
Sauget J. Contribution à l'étude des films minces SiOxNy nanostructurés destinés à des empilements antireflets : Contribution to the study of nanostructured SiOxNy thin films for antireflection coating. [Internet] [Doctoral dissertation]. Besançon; 2014. [cited 2021 Jan 27].
Available from: http://www.theses.fr/2014BESA2057.
Council of Science Editors:
Sauget J. Contribution à l'étude des films minces SiOxNy nanostructurés destinés à des empilements antireflets : Contribution to the study of nanostructured SiOxNy thin films for antireflection coating. [Doctoral Dissertation]. Besançon; 2014. Available from: http://www.theses.fr/2014BESA2057
27.
Lalošević Mirjana.
Struktura virulentnosti populacije pruzrokovača pepelnice pšenice (Blumeria graminis (DC.) Speer f. sp. tritici (Em. Marchal) na teritoriji Srbije.
Degree: 2017, University of Novi Sad
URL: https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija150512882420391.pdf?controlNumber=(BISIS)105011&fileName=150512882420391.pdf&id=10482&source=OATD&language=en
;
https://www.cris.uns.ac.rs/record.jsf?recordId=105011&source=OATD&language=en
► Prouzrokovač pepelnice (Blumeria graminis f. sp. tritici) je stalni pratilac proizvodnje pšenice u agroekološkim uslovima Srbije. Sposobnost seksualne i aseksualne reprodukcije, kao i visok…
(more)
▼ Prouzrokovač pepelnice (Blumeria graminis
f. sp. tritici) je stalni pratilac proizvodnje pšenice u agroekološkim uslovima Srbije. Sposobnost seksualne i aseksualne reprodukcije, kao i visok genetski protok patogena, čine da je prouzrokovač pepelnice genetski veoma divergentan, značajnog potencijala za adaptabilnost i promenu u virulentnosti populacije. Do sada je utvrđen znatan broj patotipova ovog patogena, dok se veliki broj konstantno stvara, te je efikasna otpornost pšenice kratkotrajne prirode. Rad na selekciji na otpornost pšenice prema prouzrokovaču pepelnice je važan zadatak oplemenjivačkih programa širom sveta. Cilj istraživanja je bio utvrđivanje strukture virulentnosti populacije patogena B. graminis
f. sp. tritici koja potiče sa teritorije Srbije, kao i dinamike njene promene tokom godina. U polnoj populaciji prouzrokovača pepelnice identifikovana je virulentnost prema svim genima pšenice za otpornost prema prouzrokovaču pepelnice (Pm geni), tokom ispitivanih godina i u svim ispitivanim lokalitetima. Utvrđene su statistički značajne razlike u virulentnosti gena patogena prema Pm genima domaćina, kao i linearni trend promene frekvencije virulentnosti gena polne populacije B. graminis
f. sp. tritici. Najnižu frekvenciju virulentnosti u populaciji tokom ispitivanog perioda ispoljila je kombinacija gena V-5+6, dok je frekvencija virulentnih gena V-6 i V-7 gena bila na konstantno visokom nivou. Najznačajnija promena u populaciji je karakteristična za kombinaciju gena V-2+4b+6. U polnoj populaciji patogena u ispitivanom periodu nijedan izolat nije ispoljio virulentnost prema kombinaciji gena Pm17, Pm2+, Pm2+6 i Pm5+6. Klaster analizom utvrđen je visok stepen genetičkog diverziteta izolata u zavisnosti od godine. Analizom veze između gena avirulentnih lokusa utvrđena je pozitivna avirulentna veza između parova gena virulentnih prema Pm17 i Pm2+6, Pm2 i Pm2+; Pm2+ i Pm3a; Pm2+ i Pm1+2+9; Pm2+ i Pm2+4a+6; Pm3a i Pm8; Pm3a i Pm1+2+9; Pm3a i Pm2+6; Pm8 i Pm17; Pm17 i Pm1+2+9; Pm17 i Pm2+6 i parova gena Pm1+2+9 i Pm2+6. Piramiding ovih parova gena može biti dobra strategija za produžetak perioda efikasnosti otpornosti određene sorte. Najniža frekvencija virulentnosti polne populacije utvrđena je u lokalitetu Sremska Mitrovica. Najveći koeficijent genetičke udaljenosti utvrđen je između izolata koji potiču sa datog lokaliteta i izolata koji potiču sa ostalih ispitivanih lokaliteta. Između genetičke i geografske udaljenosti izolata prouzrokovača pepelnice za ispitivane lokalitete nije utvrđena statistički značajna linearna veza. Analiza strukture virulentnosti bespolne populacije ukazala je da komplekstnost patotipova prouzrokovača pepelnice raste sa porastom useva. Geni patogena za virulentnost prema genima Pm3a i Pm2+ nisu utvrđeni. Najvišu frekvenciju virulentnosti imao je gen za virulentnost prema Mld genu za otpornost pšenice prema prouzrokovaču pepelnice. Statistički značajne korelacije su utvrđene između polne i…
Advisors/Committee Members: Maširević Stevan, Jevtić Radivoje, Bagi Ferenc.
Subjects/Keywords: Blumeria graminis f. sp. tritici, virulentnost, struktura populacije, pšenica, otpornost; Blumeria graminis f. sp. tritici, virulence structure, population, wheat, resistance
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APA (6th Edition):
Mirjana, L. (2017). Struktura virulentnosti populacije pruzrokovača pepelnice pšenice (Blumeria graminis (DC.) Speer f. sp. tritici (Em. Marchal) na teritoriji Srbije. (Thesis). University of Novi Sad. Retrieved from https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija150512882420391.pdf?controlNumber=(BISIS)105011&fileName=150512882420391.pdf&id=10482&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=105011&source=OATD&language=en
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Mirjana, Lalošević. “Struktura virulentnosti populacije pruzrokovača pepelnice pšenice (Blumeria graminis (DC.) Speer f. sp. tritici (Em. Marchal) na teritoriji Srbije.” 2017. Thesis, University of Novi Sad. Accessed January 27, 2021.
https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija150512882420391.pdf?controlNumber=(BISIS)105011&fileName=150512882420391.pdf&id=10482&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=105011&source=OATD&language=en.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mirjana, Lalošević. “Struktura virulentnosti populacije pruzrokovača pepelnice pšenice (Blumeria graminis (DC.) Speer f. sp. tritici (Em. Marchal) na teritoriji Srbije.” 2017. Web. 27 Jan 2021.
Vancouver:
Mirjana L. Struktura virulentnosti populacije pruzrokovača pepelnice pšenice (Blumeria graminis (DC.) Speer f. sp. tritici (Em. Marchal) na teritoriji Srbije. [Internet] [Thesis]. University of Novi Sad; 2017. [cited 2021 Jan 27].
Available from: https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija150512882420391.pdf?controlNumber=(BISIS)105011&fileName=150512882420391.pdf&id=10482&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=105011&source=OATD&language=en.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mirjana L. Struktura virulentnosti populacije pruzrokovača pepelnice pšenice (Blumeria graminis (DC.) Speer f. sp. tritici (Em. Marchal) na teritoriji Srbije. [Thesis]. University of Novi Sad; 2017. Available from: https://www.cris.uns.ac.rs/DownloadFileServlet/Disertacija150512882420391.pdf?controlNumber=(BISIS)105011&fileName=150512882420391.pdf&id=10482&source=OATD&language=en ; https://www.cris.uns.ac.rs/record.jsf?recordId=105011&source=OATD&language=en
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
28.
Lamani, Viola.
International trade, trade costs and quality of traded commodities : Commerce international, coûts à l'échange et qualité des produits échangés.
Degree: Docteur es, Sciences économiques, 2017, Bordeaux
URL: http://www.theses.fr/2017BORD0746
► L'objectif de cette thèse est d'identifier les effets des coûts à l'échange sur la structure du commerce par qualité. Dans le premier chapitre, nous analysons…
(more)
▼ L'objectif de cette thèse est d'identifier les effets des coûts à l'échange sur la structure du commerce par qualité. Dans le premier chapitre, nous analysons empiriquement les déterminants des exportations de Cognac et nous nous focalisons sur l'impact des coûts à l'échange. Nous montrons que, comme pour d'autres produits de luxe, l'élasticité des exportations de Cognac à la distance est négative et relativement faible. Les droits de douane n'ont par ailleurs pas d'impact significatif sur la marge intensive, mais nous trouvons un impact négatif sur la marge extensive, une fois corrigé d'un biais d'endogénéité. Dans le deuxième chapitre, nous testons empiriquement la validité de l'effet Alchian-Allen qui stipule que les couts unitaires augmentent la demande relative des biens de haute qualité. Nous exploitons la dimension « qualité » de nos données sur les exportations de Cognac. La mesure de la qualité du Cognac est objective et ne varie pas dans le temps. Nos résultats montrent que la distance et les droits de douane spécifiques augmentent la part relative des exportations de Cognac de haute qualité. Nous examinons également l'impact de la conteneurisation sur la structure par qualité des exportations de Cognac entre 1967 et 2013. Dans le troisième chapitre, nous construisons un modèle théorique de duopole Nord-Sud en concurrence à la Bertrand sur les deux marchés. Nous étudions l'impact de plusieurs instruments (droit de douane, quota et standard de qualité) sur l'investissement en R&D de produit de la firme du Nord. Nous montrons que cet investissement augmente avec chaque instrument de politique commerciale à l'exception du quota d'importation..
The objective of this dissertation is to identify the effects of trade costs on the quality structure of international trade flows. In chapter one we empirically analyze the determinants of Cognac export flows and emphasize the role of trade costs. We show that, as with other luxury products, the elasticity of Cognac exports to distance is negative and relatively small. Meanwhile, average customs duties do not have a significant impact on the intensive margin, but we find that they negatively affect the probability of trade, after correcting for an endogeneity bias. In chapter two we empirically test the validity of the Alchian and Allen effect that states that per-unit charges increase the relative demand of higher quality goods. We use data on Cognac exports by quality designations. The measure of Cognac quality is objective and invariant over time. Our results show that distance and specific duties increase the share of exports of higher quality Cognac. We also examine the impact of containerization on Cognac's quality mix from 1967 to 2013. In chapter three we build a theoretical model of a North-South duopoly where firms compete in prices on both markets. We use this framework to study the impact of several trade policy instruments (import tariff, quota and quality standard) on the product R&D investment of the Northern firm. Our results show that the Northern…
Advisors/Committee Members: Bouët, Antoine (thesis director), Emlinger, Charlotte (thesis director).
Subjects/Keywords: Produits de luxe; Structure du commerce par qualité; Coûts à l'échange; Cognac; Recherche et développement (R&D) de produit; Luxury products; Quality mix; Trade costs; Cognac; Product Research and Development (R&D); 330
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Lamani, V. (2017). International trade, trade costs and quality of traded commodities : Commerce international, coûts à l'échange et qualité des produits échangés. (Doctoral Dissertation). Bordeaux. Retrieved from http://www.theses.fr/2017BORD0746
Chicago Manual of Style (16th Edition):
Lamani, Viola. “International trade, trade costs and quality of traded commodities : Commerce international, coûts à l'échange et qualité des produits échangés.” 2017. Doctoral Dissertation, Bordeaux. Accessed January 27, 2021.
http://www.theses.fr/2017BORD0746.
MLA Handbook (7th Edition):
Lamani, Viola. “International trade, trade costs and quality of traded commodities : Commerce international, coûts à l'échange et qualité des produits échangés.” 2017. Web. 27 Jan 2021.
Vancouver:
Lamani V. International trade, trade costs and quality of traded commodities : Commerce international, coûts à l'échange et qualité des produits échangés. [Internet] [Doctoral dissertation]. Bordeaux; 2017. [cited 2021 Jan 27].
Available from: http://www.theses.fr/2017BORD0746.
Council of Science Editors:
Lamani V. International trade, trade costs and quality of traded commodities : Commerce international, coûts à l'échange et qualité des produits échangés. [Doctoral Dissertation]. Bordeaux; 2017. Available from: http://www.theses.fr/2017BORD0746
29.
Fessi, Nidhal.
Intensification de la dégradation de polluants organiques par photocatalyse dans des émulsions de Pickering : Intensification of organic pollutants degradation by photocatalysis in Pickering emulsions.
Degree: Docteur es, Chimie, 2018, Lyon; Université de Gabès (Tunisie)
URL: http://www.theses.fr/2018LYSE1352
► Ce travail de thèse examine une nouvelle méthode prometteuse pour la dépollution efficace des eaux contaminées par des polluants organiques insolubles de type toluène, 1-méthylnaphtalène,…
(more)
▼ Ce travail de thèse examine une nouvelle méthode prometteuse pour la dépollution efficace des eaux contaminées par des polluants organiques insolubles de type toluène, 1-méthylnaphtalène, nitrobenzène,…. Cette méthode d’oxydation avancée repose sur la photocatalyse hétérogène dans des émulsions de Pickering. Dans ce type d’émulsions, les tensioactifs stabilisants des gouttelettes huileuses sont remplacés par des nanoparticules solides à propriétés photocatalytiques élevées. Par ailleurs, ces nanoparticules solides doivent remplir les conditions de mouillabilité partielle dans les deux phases aqueuse et huileuse grâce à un équilibre hydrophile-hydrophobe à leur surface. Pour cette raison, le dioxyde de titane (TiO2) anatase a été préparé par la méthode sol-gel puis modifié par fluoration pour obtenir le catalyseur TiO2-F. L’objectif est de formuler des émulsions de Pickering de type huile dans l’eau (H/E) à partir de polluants organiques de faible solubilité dans l’eau. Les catalyseurs synthétisés ont été caractérisés par XRD, BET, SEM, DRS, XPS, et TG-TD-MS. Il a été montré que la fluoration apporte des changements importants dans les propriétés optiques du TiO2 et a amélioré l’équilibre hydrophile/hydrophobe à sa surface de façon significative. Par ailleurs, les résultats obtenus indiquent que des émulsions de Pickering stables peuvent être formulées en utilisant des particules de TiO2 ou TiO2-F de taille nanométrique. Le type et la stabilité des émulsions dépendent de la mouillabilité des nanoparticules stabilisantes évaluées par des mesures d'angle de contact. La mouillabilité des nanoparticules a été trouvée fortement dépendante du type d’huile en raison des contributions de la polarité et des interactions spécifiques avec les polluants. L'étude des émulsions de Pickering par conductivité électrique, microscopie optique et diffusion de la lumière a montré qu'une stabilité élevée a été obtenue dans des conditions de mouillage partiel : angle de contact dans l'eau compris entre 70 et 110°. L’évolution de la taille des gouttelettes d'huiles avec le rapport de masse huile/photocatalyseur a confirmé une forte adsorption des nanoparticules de catalyseur sur les gouttelettes d'huiles. Finalement, les émulsions jugées stables ont été photodégradées sous rayonnement UV. La cinétique de photodégradation des polluants organiques mesurée par HPLC a montré que la dégradation a été intensifiée en utilisant les émulsions de Pickering par rapport aux systèmes non émulsionnés. Ces résultats ont prouvé que l’utilisation des émulsions de Pickering stabilisées par des nanoparticules de dioxyde de titane constituait un moyen efficace et innovateur pour intensifier la dégradation photocatalytique des polluants organiques
This thesis examines a promising new method for the effective depollution of water contaminated by insoluble organic pollutants such as toluene, 1-methylnaphthalene, nitrobenzene, etc. This advanced oxidation method is based on heterogeneous photocatalysis in Pickering emulsions. In this type of emulsion, the…
Advisors/Committee Members: Chevalier, Yves (thesis director), Houas, Ammar (thesis director).
Subjects/Keywords: Émulsions de Pickering; Photocatalyse; TiO2; TiO2-F; Pickering emulsion; Photocatalysis; TiO2; TiO2-F; 540
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APA ·
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MLA ·
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CSE |
Export
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APA (6th Edition):
Fessi, N. (2018). Intensification de la dégradation de polluants organiques par photocatalyse dans des émulsions de Pickering : Intensification of organic pollutants degradation by photocatalysis in Pickering emulsions. (Doctoral Dissertation). Lyon; Université de Gabès (Tunisie). Retrieved from http://www.theses.fr/2018LYSE1352
Chicago Manual of Style (16th Edition):
Fessi, Nidhal. “Intensification de la dégradation de polluants organiques par photocatalyse dans des émulsions de Pickering : Intensification of organic pollutants degradation by photocatalysis in Pickering emulsions.” 2018. Doctoral Dissertation, Lyon; Université de Gabès (Tunisie). Accessed January 27, 2021.
http://www.theses.fr/2018LYSE1352.
MLA Handbook (7th Edition):
Fessi, Nidhal. “Intensification de la dégradation de polluants organiques par photocatalyse dans des émulsions de Pickering : Intensification of organic pollutants degradation by photocatalysis in Pickering emulsions.” 2018. Web. 27 Jan 2021.
Vancouver:
Fessi N. Intensification de la dégradation de polluants organiques par photocatalyse dans des émulsions de Pickering : Intensification of organic pollutants degradation by photocatalysis in Pickering emulsions. [Internet] [Doctoral dissertation]. Lyon; Université de Gabès (Tunisie); 2018. [cited 2021 Jan 27].
Available from: http://www.theses.fr/2018LYSE1352.
Council of Science Editors:
Fessi N. Intensification de la dégradation de polluants organiques par photocatalyse dans des émulsions de Pickering : Intensification of organic pollutants degradation by photocatalysis in Pickering emulsions. [Doctoral Dissertation]. Lyon; Université de Gabès (Tunisie); 2018. Available from: http://www.theses.fr/2018LYSE1352
Universidade Presbiteriana Mackenzie
30.
Marcos Antonio Franklin.
Estrutura organizacional, orientações para exploitation e exploration e tipos de inovações em institutos de pesquisa e desenvolvimento tecnológicos.
Degree: 2011, Universidade Presbiteriana Mackenzie
URL: http://tede.mackenzie.com.br//tde_busca/arquivo.php?codArquivo=2463
► Este estudo examina como a estrutura organizacional, mecânica ou orgânica, e as orientações para exploitation e exploration do conhecimento organizacional podem explicar as inovações em…
(more)
▼ Este estudo examina como a estrutura organizacional, mecânica ou orgânica, e as orientações para exploitation e exploration do conhecimento organizacional podem explicar as inovações em institutos
de pesquisa e desenvolvimento (P&D) tecnológicos concentrados em serviços e produtos ligados à internet, software, hardware, telecomunicações (Telecom), tecnologia da informação (TI) e automação. Tem como objetivo caracterizar e classificar esses institutos,
de acordo com os modelos e as orientações relativas ao conhecimento organizacional adotados. Para tanto, a pesquisa apresenta duas etapas: qualitativa e quantitativa. A etapa qualitativa foi conduzida com a utilização
de quatro estudos
de casos, sendo dois institutos nacionais, um privado e um público, e mais dois privados estrangeiros sediados no Brasil, mediante a utilização
de um roteiro semiestruturado. Para análise dos dados, adota-se a análise
de conteúdo, análise das dimensões e observação não-participante. Com base nos achados desta fase, realizou-se a etapa quantitativa, por meio da aplicação
de um questionário em 17 institutos
de P&D, cujo universo era
de 44. Este questionário está estruturado fechado e incorporava um conjunto
de assertivas mensuradas, segundo uma escala tipo Likert, com sete pontos. Esta análise é descritiva e complementada com dados secundários, por meio da pesquisa nos website dos institutos. Neste sentido, para as análises, é adotada a técnica da triangulação dos dados, visando à obtenção
de maior fidedignidade nos resultados. Os resultados revelaram predominância do modelo orgânico em 19
de 21 dos institutos estudados, compreendendo as duas etapas. Contudo, verifica-se também que, apesar da forte orientação para o modelo orgânico, há elementos do modelo mecânico: revelam capacidade combinatória em utilizar a burocracia sem, no entanto, deixar
de ser flexível. Dois dos institutos apresentam a configuração mecânica não demonstrando capacidade
de combinação, isto é, a base é a burocracia, a padronização, a formalização e a especialização. Considerando as orientações para exploitation e exploration é possivel identificar e concluir que os institutos tendem a ter orientações para exploration, mas apresentam focos em exploitation, como é o caso
de eficiência relativa aos processos e às rotinas
de trabalho padronizados. As quatro proposições levantadas para esta etapa da pesquisa, foram confirmadas em 14 institutos e ratificadas nos achados da etapa qualitativa. Quanto à classificação dos 21 institutos pesquisados, pode-se afirmar que o foco
de atuação é predominantemente em serviços e produtos. No que diz respeito à vocação dos institutos, onze se revelam voltados para P&D com inovações radicais e incrementais. Entretanto, em nove destes casos é possivel afirmar que a vocação é D, desenvolvimento. A contribuição desta tese se revela, do ponto
de vista acadêmico, na discussão do papel dos modelos
de estruturas organizacionais e
de orientações para exploitation e exploration na busca
de possíveis lacunas entre a teoria e a aplicação: do ponto
de…
Advisors/Committee Members: Silvio Popadiuk, Dimária Silva e Meirelles, Diógenes de Souza Bido, Silvia Novaes Zilber, Marcos Augusto de Vasconcellos.
Subjects/Keywords: R&D institute of technology; estrutura organizacional; exploitation e exploration; inovação; instituto de P&D tecnológico; organization structure; exploitation and exploration; innovation; ADMINISTRACAO
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APA (6th Edition):
Franklin, M. A. (2011). Estrutura organizacional, orientações para exploitation e exploration e tipos de inovações em institutos de pesquisa e desenvolvimento tecnológicos. (Thesis). Universidade Presbiteriana Mackenzie. Retrieved from http://tede.mackenzie.com.br//tde_busca/arquivo.php?codArquivo=2463
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Franklin, Marcos Antonio. “Estrutura organizacional, orientações para exploitation e exploration e tipos de inovações em institutos de pesquisa e desenvolvimento tecnológicos.” 2011. Thesis, Universidade Presbiteriana Mackenzie. Accessed January 27, 2021.
http://tede.mackenzie.com.br//tde_busca/arquivo.php?codArquivo=2463.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Franklin, Marcos Antonio. “Estrutura organizacional, orientações para exploitation e exploration e tipos de inovações em institutos de pesquisa e desenvolvimento tecnológicos.” 2011. Web. 27 Jan 2021.
Vancouver:
Franklin MA. Estrutura organizacional, orientações para exploitation e exploration e tipos de inovações em institutos de pesquisa e desenvolvimento tecnológicos. [Internet] [Thesis]. Universidade Presbiteriana Mackenzie; 2011. [cited 2021 Jan 27].
Available from: http://tede.mackenzie.com.br//tde_busca/arquivo.php?codArquivo=2463.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Franklin MA. Estrutura organizacional, orientações para exploitation e exploration e tipos de inovações em institutos de pesquisa e desenvolvimento tecnológicos. [Thesis]. Universidade Presbiteriana Mackenzie; 2011. Available from: http://tede.mackenzie.com.br//tde_busca/arquivo.php?codArquivo=2463
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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