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1.
Ketz, Philipp M.
Inference When the True Parameter Vector Is near or at the
Boundary of the Parameter Space.
Degree: PhD, Economics, 2015, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:419522/ 
► This dissertation examines several standard testing problems under the nonstandard condition that the true parameter vector is near or at the boundary of the parameter…
(more)
▼ This dissertation examines several standard testing
problems under the nonstandard condition that the true parameter
vector is near or at the
boundary of the parameter space. In
particular, it analyzes the problem of subvector inference and the
problem of testing overidentifying restrictions. Standard testing
procedures, such as those based on the t-statistic and the
J-statistic, rely on the asymptotic normality of the underlying
estimator. However, when the true parameter vector is near or at
the
boundary, the commonly employed estimator ceases to be
asymptotically normal. As a result, standard testing procedures
suffer from size-distortions. Even if, in some cases, size-control
is maintained or can be established by adjusting the critical
values, the corresponding tests are conservative and display poor
power in large parts of the parameter space. To address the lack of
testing procedures that appropriately account for
boundary effects
on the distribution of the estimator, this dissertation proposes
new testing procedures. They are based on a novel estimator that is
asymptotically normally distributed when the true parameter vector
is near or at the
boundary and the objective function is not
defined outside the parameter space. The new testing procedures
control size by construction and offer power improvements over
standard testing procedures, when the latter control size. The
results of this dissertation apply, for example, in the context of
random coefficient models, where variance parameters are restricted
below by zero.
Advisors/Committee Members: Kleibergen, Frank (Director), McCloskey, Adam (Reader), Norets, Andriy (Reader), Renault, Eric (Reader).
Subjects/Keywords: Boundary
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APA (6th Edition):
Ketz, P. M. (2015). Inference When the True Parameter Vector Is near or at the
Boundary of the Parameter Space. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:419522/
Chicago Manual of Style (16th Edition):
Ketz, Philipp M. “Inference When the True Parameter Vector Is near or at the
Boundary of the Parameter Space.” 2015. Doctoral Dissertation, Brown University. Accessed January 22, 2020.
https://repository.library.brown.edu/studio/item/bdr:419522/.
MLA Handbook (7th Edition):
Ketz, Philipp M. “Inference When the True Parameter Vector Is near or at the
Boundary of the Parameter Space.” 2015. Web. 22 Jan 2020.
Vancouver:
Ketz PM. Inference When the True Parameter Vector Is near or at the
Boundary of the Parameter Space. [Internet] [Doctoral dissertation]. Brown University; 2015. [cited 2020 Jan 22].
Available from: https://repository.library.brown.edu/studio/item/bdr:419522/.
Council of Science Editors:
Ketz PM. Inference When the True Parameter Vector Is near or at the
Boundary of the Parameter Space. [Doctoral Dissertation]. Brown University; 2015. Available from: https://repository.library.brown.edu/studio/item/bdr:419522/
University of Georgia
2.
McDunn, Benjamin Andrew.
Boundary extension and normalization for memory of abstract and real-world scenes.
Degree: MS, Psychology, 2013, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/mcdunn_benjamin_a_201308_ms
► Boundary Extension (BE) is a widely reported memory phenomenon in which people recall seeing a wider-angle view of a scene than was actually seen. This…
(more)
▼ Boundary Extension (BE) is a widely reported memory phenomenon in which people recall seeing a wider-angle view of a scene than was actually seen. This effect is thought to be due to fundamental perception processes inherent in scene viewing that cause these complex stimuli to be remembered differently than simple objects. Certain image manipulations used in previous work suggest that another memory effect called normalization may be affecting responses depending on the characteristics of the pictures’ contents and how they are presented to participants. This study examines the interaction of these two effects for abstract scenes, characterized by a lack of long-term memory associations with the image contents, and for scenes depicting the real world. Experiment 1 verifies the co-occurrence of BE and memory normalization for some images. Experiment 2 is the first known scene memory experiment using intact pictures of the real world that does not show BE.
Advisors/Committee Members: James Brown.
Subjects/Keywords: boundary extension
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APA (6th Edition):
McDunn, B. A. (2013). Boundary extension and normalization for memory of abstract and real-world scenes. (Masters Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/mcdunn_benjamin_a_201308_ms
Chicago Manual of Style (16th Edition):
McDunn, Benjamin Andrew. “Boundary extension and normalization for memory of abstract and real-world scenes.” 2013. Masters Thesis, University of Georgia. Accessed January 22, 2020.
http://purl.galileo.usg.edu/uga_etd/mcdunn_benjamin_a_201308_ms.
MLA Handbook (7th Edition):
McDunn, Benjamin Andrew. “Boundary extension and normalization for memory of abstract and real-world scenes.” 2013. Web. 22 Jan 2020.
Vancouver:
McDunn BA. Boundary extension and normalization for memory of abstract and real-world scenes. [Internet] [Masters thesis]. University of Georgia; 2013. [cited 2020 Jan 22].
Available from: http://purl.galileo.usg.edu/uga_etd/mcdunn_benjamin_a_201308_ms.
Council of Science Editors:
McDunn BA. Boundary extension and normalization for memory of abstract and real-world scenes. [Masters Thesis]. University of Georgia; 2013. Available from: http://purl.galileo.usg.edu/uga_etd/mcdunn_benjamin_a_201308_ms
University of Georgia
3.
Siddiqui, Aisha Patrice.
The role of gist processing in boundary extension.
Degree: PhD, Psychology, 2013, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/siddiqui_aisha_p_201312_phd
► Boundary extension is a ubiquitous phenomenon in which participants remember seeing more of an image than was previously shown. According to the Multisource Model of…
(more)
▼ Boundary extension is a ubiquitous phenomenon in which participants remember seeing more of an image than was previously shown. According to the Multisource Model of Scene Perception, viewers create a representation of their environment within a single fixation that integrates presented scene information with their expectations of what should exist there. The purpose of the following experiments was to determine the extent to which
boundary extension relies on gist processing, and particularly, whether access to certain scene gist properties could be used to explain previous findings in the
boundary extension literature. The gist of the scene is readily available at short timespans and was hypothesized to facilitate the existence of
boundary extension by contributing schematic information about the scene into the representation. By shortening the encoding duration, access to the gist was gradually reduced to threshold levels. Experiment 1 was used to determine whether
boundary extension could be elicited with natural complex scenes. The results from Experiment 1 showed that
boundary extension could be elicited from complex natural, landscape scenes; however, it heavily depended on the participants’ perceived depth rating and their perceived navigability of the scene. Experiment 2 manipulated access to the mean depth gist property and showed that
boundary extension decreased as access to the gist was reduced, whereas Experiment 3 manipulated access to the navigability gist property and found that
boundary extension increased as access to the gist was reduced. Experiment 2 provides evidence that the gist property depth is essential to the existence of
boundary extension, making available schematic information to our scene representation which leads to increases in the source monitoring error. Experiment 3 shows evidence that navigability also provides schematic information to our scene representation however due to the adaptive function of the property it serves to provide veridical memory for the scene.
Advisors/Committee Members: James Brown.
Subjects/Keywords: Boundary Extension
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APA (6th Edition):
Siddiqui, A. P. (2013). The role of gist processing in boundary extension. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/siddiqui_aisha_p_201312_phd
Chicago Manual of Style (16th Edition):
Siddiqui, Aisha Patrice. “The role of gist processing in boundary extension.” 2013. Doctoral Dissertation, University of Georgia. Accessed January 22, 2020.
http://purl.galileo.usg.edu/uga_etd/siddiqui_aisha_p_201312_phd.
MLA Handbook (7th Edition):
Siddiqui, Aisha Patrice. “The role of gist processing in boundary extension.” 2013. Web. 22 Jan 2020.
Vancouver:
Siddiqui AP. The role of gist processing in boundary extension. [Internet] [Doctoral dissertation]. University of Georgia; 2013. [cited 2020 Jan 22].
Available from: http://purl.galileo.usg.edu/uga_etd/siddiqui_aisha_p_201312_phd.
Council of Science Editors:
Siddiqui AP. The role of gist processing in boundary extension. [Doctoral Dissertation]. University of Georgia; 2013. Available from: http://purl.galileo.usg.edu/uga_etd/siddiqui_aisha_p_201312_phd
University of Georgia
4.
Baggett, Emily Anne.
Familial predictors of young adult romantic relationship functioning: a closer look at boundary dissolution.
Degree: BS, Psychology, 2010, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/baggett_emily_a_201005_bs
► The current study examines the specific relations of boundary dissolution—the disintegration of normal parent-child roles in which the child fulfills the parent’s emotional needs to…
(more)
▼ The current study examines the specific relations of
boundary dissolution—the disintegration of normal parent-child roles in which the child fulfills the parent’s emotional needs to an inappropriate degree—to young adult romantic relationship satisfaction and insecurity.
Boundary dissolution, retrospectively reported by 779 college undergraduates, was regressed along measures of relationship satisfaction and insecurity while controlling for the variance explained by measures of adult attachment and authoritative parenting style. Authoritative parenting style was measured by the Authoritative subscale of the Parental Authority Questionnaire (PAQ; Buri, 1991). Adult attachment was measured by the total parent scale score of the Inventory of Peer and Parent Attachment (IPPA; Armsden & Greenberg, 1987).
Boundary dissolution was assessed using the parentification, adultification, and seductive spousification subscales of the Parent-Child
Boundary Scale (PBS; Kerig, 2006). The PAQ, IPPA, and PBS were administered separately for mother and father. Romantic relationships outcomes included measures of insecurity and satisfaction. Our results indicate that, after controlling for PAQ and IPPA scores, the measures of
boundary dissolution are significantly related to romantic relationship satisfaction and insecurity. Specifically, relationship satisfaction was predicted by maternal and paternal adultification (β = -.15 and -.13 respectively, both p < .05), maternal spousification (β = -.17, p < .05), and paternal parentification (β = -.14, p < .05). Relationship insecurity was predicted by maternal spousification (β = .12, p < .05) and paternal adultification (β = .16, p < .05). The results of this study extend the theoretical understanding of the interpersonal outcomes of
boundary dissolution. Future research will seek to identify factors that may mediate the relations between
boundary dissolution and romantic relationship functioning.
Advisors/Committee Members: Anne Shaffer.
Subjects/Keywords: Boundary dissolution
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APA (6th Edition):
Baggett, E. A. (2010). Familial predictors of young adult romantic relationship functioning: a closer look at boundary dissolution. (Thesis). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/baggett_emily_a_201005_bs
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):
Baggett, Emily Anne. “Familial predictors of young adult romantic relationship functioning: a closer look at boundary dissolution.” 2010. Thesis, University of Georgia. Accessed January 22, 2020.
http://purl.galileo.usg.edu/uga_etd/baggett_emily_a_201005_bs.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Baggett, Emily Anne. “Familial predictors of young adult romantic relationship functioning: a closer look at boundary dissolution.” 2010. Web. 22 Jan 2020.
Vancouver:
Baggett EA. Familial predictors of young adult romantic relationship functioning: a closer look at boundary dissolution. [Internet] [Thesis]. University of Georgia; 2010. [cited 2020 Jan 22].
Available from: http://purl.galileo.usg.edu/uga_etd/baggett_emily_a_201005_bs.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Baggett EA. Familial predictors of young adult romantic relationship functioning: a closer look at boundary dissolution. [Thesis]. University of Georgia; 2010. Available from: http://purl.galileo.usg.edu/uga_etd/baggett_emily_a_201005_bs
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Georgia
5.
Mull, Casey Downs.
Boundary-spanning behaviors of individuals engaged with the U.S. military community.
Degree: PhD, Adult Education, 2014, University of Georgia
URL: http://purl.galileo.usg.edu/uga_etd/mull_casey_d_201412_phd
► The public sector’s use of networked governance reflects a similar orientation of U.S. higher education institutions to engaged scholarship and community-university partnerships. These and other…
(more)
▼ The public sector’s use of networked governance reflects a similar orientation of U.S. higher education institutions to engaged scholarship and community-university partnerships. These and other forms of adult education now have greater reliance on networked governance methods for their delivery and administration. Individuals at the nexus of networked governance and community engagement often take on
boundary spanning roles for their organizations. This study examined the behaviors of
boundary spanners currently involved in the partnership of U.S. higher education institutions and the U.S. military to support military family services through educational programming in a networked governance model. A research team created a selected response instrument for use with multiple audiences and contexts based on a qualitative study of higher education community engagement
boundary spanning individuals. This study found that work/organizational characteristics were significant predictors of
boundary-spanning behaviors while personal characteristics were not as influential as thought.
Boundary-spanning behavior can be encouraged by the organization in a variety of ways. Communications remain an important influence on
boundary spanning behaviors. The study reconceptualizes a prior qualitative study through exploratory factor analysis. The reconceptualization found that the data mirrors the original, qualitative study on which the quantitative instrument was based. The selected response instrument has applicability to other contexts where individuals cross boundaries in order to complete work in a community. Several individual, organizational, and societal implications and opportunities for replication and expanded research in the realm of
boundary spanning are discussed.
Advisors/Committee Members: Lorilee R. Sandmann.
Subjects/Keywords: boundary spanning
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APA (6th Edition):
Mull, C. D. (2014). Boundary-spanning behaviors of individuals engaged with the U.S. military community. (Doctoral Dissertation). University of Georgia. Retrieved from http://purl.galileo.usg.edu/uga_etd/mull_casey_d_201412_phd
Chicago Manual of Style (16th Edition):
Mull, Casey Downs. “Boundary-spanning behaviors of individuals engaged with the U.S. military community.” 2014. Doctoral Dissertation, University of Georgia. Accessed January 22, 2020.
http://purl.galileo.usg.edu/uga_etd/mull_casey_d_201412_phd.
MLA Handbook (7th Edition):
Mull, Casey Downs. “Boundary-spanning behaviors of individuals engaged with the U.S. military community.” 2014. Web. 22 Jan 2020.
Vancouver:
Mull CD. Boundary-spanning behaviors of individuals engaged with the U.S. military community. [Internet] [Doctoral dissertation]. University of Georgia; 2014. [cited 2020 Jan 22].
Available from: http://purl.galileo.usg.edu/uga_etd/mull_casey_d_201412_phd.
Council of Science Editors:
Mull CD. Boundary-spanning behaviors of individuals engaged with the U.S. military community. [Doctoral Dissertation]. University of Georgia; 2014. Available from: http://purl.galileo.usg.edu/uga_etd/mull_casey_d_201412_phd
Victoria University of Wellington
6.
Moreno, Michael.
Porosity and Play: Sustaining Public Life in New Zealand's Suburban Shopping Centres.
Degree: 2010, Victoria University of Wellington
URL: http://hdl.handle.net/10063/1620
► Throughout history, public plazas and town squares have provided the public realm for people to meet and "people watch". However the privatisation of public space…
(more)
▼ Throughout history, public plazas and town squares have provided the
public realm for people to meet and "people watch". However the
privatisation of public space has resulted in the demise of these traditional
exterior public domains. These have been replaced by strictly controlled
interior shopping malls, which place limitations on public behaviour.
The concepts of 'play' and 'porosity' are possible remedies to the
limitations. The purpose of this research is therefore to discover how the
concepts of ‘play’ and ‘porosity’ can guide the redevelopment of New
Zealand’s suburban shopping malls so as to enhance the quality of public
space without detracting from the malls' commercial performance.
In essence, 'play' is the spontaneous interaction which enriches public life
and space, and is an encapsulation of the ideas of Jan Gehl, Elizabeth
Farrelly and Quentin Stevens. 'Porosity', a concept coined by Nan Ellin,
involves mixing views, programmes, ecology and paths within the same
space. This revealed itself to be a method by which a space might be
manipulated to support play.
The '
boundary' is considered by both Stevens and Gehl to be an ideal
space for play to occur, as it provides people with something to work
against. Consequently, the
boundary is investigated as the space where
play and porosity interact.
The investigation of play, porosity and the
boundary includes an
examination of international mall precedents and New Zealand case
studies. The findings from these studies and a review of relevant literature are eventually tested in a design case study. This involves a
redevelopment of Pakuranga Mall in Auckland, and includes a detailed
investigation of a single
boundary at an architectural scale.
The design successfully proves that that a specific type of play can interact
with porosity at a
boundary in order to locally enhance the quality of public
space. However the design also raises further questions about the
concepts of porosity and play. Porosity was achieved in both the master
plan and the design of the single
boundary and was therefore developed
at both the macro and micro scales. However the concept of play was
successfully introduced only at the micro level of architectural
development at the
boundary. Therefore, the conclusion to this thesis
discusses whether the interaction of play and porosity is limited to the
boundary, or if the two concepts can be developed further to interact at a
macro scale beyond the confines of a single
boundary.
Advisors/Committee Members: McDonald, Chris.
Subjects/Keywords: Mall; Boundary
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APA (6th Edition):
Moreno, M. (2010). Porosity and Play: Sustaining Public Life in New Zealand's Suburban Shopping Centres. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/1620
Chicago Manual of Style (16th Edition):
Moreno, Michael. “Porosity and Play: Sustaining Public Life in New Zealand's Suburban Shopping Centres.” 2010. Masters Thesis, Victoria University of Wellington. Accessed January 22, 2020.
http://hdl.handle.net/10063/1620.
MLA Handbook (7th Edition):
Moreno, Michael. “Porosity and Play: Sustaining Public Life in New Zealand's Suburban Shopping Centres.” 2010. Web. 22 Jan 2020.
Vancouver:
Moreno M. Porosity and Play: Sustaining Public Life in New Zealand's Suburban Shopping Centres. [Internet] [Masters thesis]. Victoria University of Wellington; 2010. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/10063/1620.
Council of Science Editors:
Moreno M. Porosity and Play: Sustaining Public Life in New Zealand's Suburban Shopping Centres. [Masters Thesis]. Victoria University of Wellington; 2010. Available from: http://hdl.handle.net/10063/1620
7.
Wang, Chien-Kai.
Grain Boundary Field Projection Method and Atomic Lattice
Interferometer for Nanometrology.
Degree: PhD, Mechanics of Solids, 2014, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:386259/
► The aim of this thesis is to investigate how grain boundary (GB) strength and separation mechanisms affect strength and ductility of nanocrystalline materials. Such nanoscale…
(more)
▼ The aim of this thesis is to investigate how grain
boundary (GB) strength and separation mechanisms affect strength
and ductility of nanocrystalline materials. Such nanoscale
materials are highly nonlinear and thus have different energy
profiles in different atomic configurations. Therefore, failure of
GBs under straining is highly cooperative and process-dependent in
nano-granular materials. To ascertain the strength and toughness of
GBs, accurate and quantitative assessments of GB field descriptions
with atomic features are required. Two new means of establishing
connections between global loadings to nanoscale GB traction
distributions are developed: the interior and exterior field
projection methods of GBs for computation and experiment
respectively. Three mechanisms of Cu symmetric tilt GB deformation
are introduced through the GB field projection methods. First,
symmetric atomic rearrangement reduces concentrated compression of
the GB tractions due to the ease of intergranular incompatibility.
Second, asymmetric atomic rearrangement or dislocation emission
decreases the concentrated tension leading GB opening and triggers
the shear traction fluctuations as a new strain energy reservoir.
Thus the GB separation toughness is enhanced. Third, Pb impurities
at the GBs maintain the tension peaks of normal traction
fluctuations and then retard the traction transformation. Hence,
the GB becomes brittle. In addition to the GB field projection
methods, we introduce an invention of an experimental instrument –
atomic lattice interferometer, which can give us sub-angstrom scale
resolution of deformation measurement. The corresponding
calibration experiments were implemented on highly ordered
pyrolytic graphite (HOPG), and the atomic-scale strain fields of a
crinkle structure in HOPG were successfully measured. The
measurement results show that the crinkle ridge line has a highly
concentrated surface curvature involving localized atomic-scale
deformations. With the help of simulation-assisted data analyses,
the experimental data reveal that the typical width, the kink angle
and the minimum radius of the ridge as 1.76 nm, 6.2° and 8.51 nm,
respectively. In summary, this thesis develops novel scientific
computational projection methods and experimental metrology
instrument for investigating unexplored global physical phenomena
of materials associated with minute and localized atomic
deformation at nanometer scales.
Advisors/Committee Members: Kim, Kyung-Suk (Director), Gao, Huajian (Reader), Kumar, Sharvan (Reader).
Subjects/Keywords: Grain boundary
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Wang, C. (2014). Grain Boundary Field Projection Method and Atomic Lattice
Interferometer for Nanometrology. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:386259/
Chicago Manual of Style (16th Edition):
Wang, Chien-Kai. “Grain Boundary Field Projection Method and Atomic Lattice
Interferometer for Nanometrology.” 2014. Doctoral Dissertation, Brown University. Accessed January 22, 2020.
https://repository.library.brown.edu/studio/item/bdr:386259/.
MLA Handbook (7th Edition):
Wang, Chien-Kai. “Grain Boundary Field Projection Method and Atomic Lattice
Interferometer for Nanometrology.” 2014. Web. 22 Jan 2020.
Vancouver:
Wang C. Grain Boundary Field Projection Method and Atomic Lattice
Interferometer for Nanometrology. [Internet] [Doctoral dissertation]. Brown University; 2014. [cited 2020 Jan 22].
Available from: https://repository.library.brown.edu/studio/item/bdr:386259/.
Council of Science Editors:
Wang C. Grain Boundary Field Projection Method and Atomic Lattice
Interferometer for Nanometrology. [Doctoral Dissertation]. Brown University; 2014. Available from: https://repository.library.brown.edu/studio/item/bdr:386259/
Rice University
8.
Gomez, Veronica.
Claiming the Line: Ephemeral Boundary.
Degree: M. Arch., Architecture, 2019, Rice University
URL: http://hdl.handle.net/1911/105387
► This thesis claims architecture (and specific forms of architectural practice) as a tool of advocacy to engage relevant political and social issues of great urgency…
(more)
▼ This thesis claims architecture (and specific forms of architectural practice) as a tool of advocacy to engage relevant political and social issues of great urgency around the world. The project critiques international border walls and the dehumanizing conditions generated urbanistically, economically, and socially through their divisive nature. To address this complex political and social topic, three forms of design research and representation are used to explore, demonstrate and question political futures through architecture. This diverse set of formats —a research map, a medium-scale building and a small-scale object or piece of furniture — are independent trajectories that operate collectively, synthetically, and equally in this investigation.
Advisors/Committee Members: Finley, Dawn (advisor).
Subjects/Keywords: border; boundary
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APA (6th Edition):
Gomez, V. (2019). Claiming the Line: Ephemeral Boundary. (Masters Thesis). Rice University. Retrieved from http://hdl.handle.net/1911/105387
Chicago Manual of Style (16th Edition):
Gomez, Veronica. “Claiming the Line: Ephemeral Boundary.” 2019. Masters Thesis, Rice University. Accessed January 22, 2020.
http://hdl.handle.net/1911/105387.
MLA Handbook (7th Edition):
Gomez, Veronica. “Claiming the Line: Ephemeral Boundary.” 2019. Web. 22 Jan 2020.
Vancouver:
Gomez V. Claiming the Line: Ephemeral Boundary. [Internet] [Masters thesis]. Rice University; 2019. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1911/105387.
Council of Science Editors:
Gomez V. Claiming the Line: Ephemeral Boundary. [Masters Thesis]. Rice University; 2019. Available from: http://hdl.handle.net/1911/105387
University of Hong Kong
9.
何溢翹; Ho, Yat-kiu.
Wind-tunnel study of turbulent boundary layer over
idealised urban roughness with application to urban ventilation
problem.
Degree: PhD, 2017, University of Hong Kong
URL: http://hdl.handle.net/10722/240673
► The flows in the lowest part of the urban atmospheric boundary layer (ABL) are investigated in this dissertation. The flow structure is characterised by the…
(more)
▼ The flows in the lowest part of the urban
atmospheric boundary layer (ABL) are investigated in this
dissertation. The flow structure is characterised by the surface
morphology that has direct effect on the street-level ventilation.
Numerical study using computational fluid dynamics (CFD), wind
tunnel experiments and analytical derivation are performed to
examine the dynamics in the inner region of a neutral urban ABL.
In the first part of the dissertation, the flows over idealised
two-dimensional (2D) urban street canyons of different
building-height-to-street-width (aspect) ratios (ARs) and urban ABL
thickness are numerically investigated from a street canyon point
of view. The friction factor f and the air-exchange rate (ACH) are
used to parameterise the aerodynamic resistance and the
street-level ventilation performance over urban areas respectively.
It is found that atmospheric turbulence contributes most to
street-level ventilation because the turbulent component of ACH
(ACH’’) dominates the transport process (at least 70% of the total
ACH). Besides, the collective effect of AR and urban ABL thickness
on ACH is reflected by the f. A linear relation between ACH’’ and
the square root of friction factor (ACH’’ ∝ f^(1/2)) is revealed.
An empirical parameterisation is thus proposed by extrapolating
ACH’’ to predict the street-level ventilation efficiency.
In the
second part of the dissertation, focus is put on the urban ABL
adjacent to the urban surfaces (boundary-layer point of view). The
dynamics in the inner layer (roughness sublayer RSL and inertial
sublayer ISL) of the urban ABLs over either idealised or real
complex urban configurations are studied analytically and
experimentally. An analytical solution to the mean wind profile
which is a continuous function applicable to both RSL and ISL is
derived based on the Monin-Obukhov similarity theory (MOST) to
account for the RSL effects over urban surfaces. The RSL function
is then coupled with the mixing-length model to elucidate how
surface roughness alters the RSL turbulence. A series of wind
tunnel experiments are performed to measure the turbulent boundary
layer structure over idealised surface (in the form of 2D rib-type
roughness elements) and real complex urban surfaces (an urban model
of Hong Kong) using hot-wire anemometry (HWA). The analytical
prediction agrees well with the experimental result that improves
the estimate to mean velocity profiles and turbulence length scales
in the near-ground region over urban areas.
Consolidating the
analytical and experimental results, it is confirmed that the inner
layer flows over urban areas exhibit two distinct behaviours: 1)
logarithmic properties in the ISL and 2) physical influence of
individual buildings on near-surface RSL flows are demonstrated in
which the RSL effects should be taken in account. Finally, an
improved ventilation estimate with RSL consideration is proposed
using a vertical fluctuating velocity scale 〈w ̂ 〉 which
facilitates a handy parameterisation for estimating street-level
air quality.…
Subjects/Keywords: Turbulent boundary layer; Boundary layer (Meteorology)
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APA (6th Edition):
何溢翹; Ho, Y. (2017). Wind-tunnel study of turbulent boundary layer over
idealised urban roughness with application to urban ventilation
problem. (Doctoral Dissertation). University of Hong Kong. Retrieved from http://hdl.handle.net/10722/240673
Chicago Manual of Style (16th Edition):
何溢翹; Ho, Yat-kiu. “Wind-tunnel study of turbulent boundary layer over
idealised urban roughness with application to urban ventilation
problem.” 2017. Doctoral Dissertation, University of Hong Kong. Accessed January 22, 2020.
http://hdl.handle.net/10722/240673.
MLA Handbook (7th Edition):
何溢翹; Ho, Yat-kiu. “Wind-tunnel study of turbulent boundary layer over
idealised urban roughness with application to urban ventilation
problem.” 2017. Web. 22 Jan 2020.
Vancouver:
何溢翹; Ho Y. Wind-tunnel study of turbulent boundary layer over
idealised urban roughness with application to urban ventilation
problem. [Internet] [Doctoral dissertation]. University of Hong Kong; 2017. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/10722/240673.
Council of Science Editors:
何溢翹; Ho Y. Wind-tunnel study of turbulent boundary layer over
idealised urban roughness with application to urban ventilation
problem. [Doctoral Dissertation]. University of Hong Kong; 2017. Available from: http://hdl.handle.net/10722/240673
University of Cincinnati
10.
Kelkar, Harshvardhan.
Boundary Marking of Phenomenon using Wireless Sensor
Networks.
Degree: MS, Engineering : Computer Science, 2009, University of Cincinnati
URL: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258666674
► Wireless sensors networks (WSN's) provide ubiquitous and distributed sensing of data for a single or multiple phenomenon. Wireless sensor device is generally small in size…
(more)
▼ Wireless sensors networks (WSN's) provide ubiquitous
and distributed sensing of data for a single or multiple
phenomenon. Wireless sensor device is generally small in size and
is cost effective. These characteristics of a WSN are ideal for use
in determining
boundary of phenomenon in different scenarios.
However,often such boundaries are camouflaged or covered by cloud,
fog, heavy forest, orsmoke. For example, the use of modern tanks
and different types of explosives frequently cause a cloud of smoke
in the battlefield which tends to disperse in a wider area. From
the strategic point of view, it is important to determine the
accurate region of on-ground actions which are hidden from
sophisticated satellite data or areal pictures. Here, we propose an
approximation method of determining the minimum number of sensors
to cover a given percentage ofthe
boundary of the phenomena. The
approximated model of the problem is mapped to filling n bins
problem which is solved by a Markov chain with an absorption state.
Then, we solve the problem for two specific sensor deployment
distributions: uniform and Gaussian. We obtain closed form solution
for uniform distribution and a simple solution for the Gaussian
case. We validate our solutions with extensive simulation results
and investigate the accuracy of ourapproximated model. Our results
can be used as a lower bound for an actual sensor deployment for
boundary detection and provide valuable information for other
statistical simulations related to the
boundary
estimation.
Advisors/Committee Members: Agrawal, Dharma (Committee Chair).
Subjects/Keywords: Computer Science; Boundary detection; Boundary marking
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APA (6th Edition):
Kelkar, H. (2009). Boundary Marking of Phenomenon using Wireless Sensor
Networks. (Masters Thesis). University of Cincinnati. Retrieved from http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258666674
Chicago Manual of Style (16th Edition):
Kelkar, Harshvardhan. “Boundary Marking of Phenomenon using Wireless Sensor
Networks.” 2009. Masters Thesis, University of Cincinnati. Accessed January 22, 2020.
http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258666674.
MLA Handbook (7th Edition):
Kelkar, Harshvardhan. “Boundary Marking of Phenomenon using Wireless Sensor
Networks.” 2009. Web. 22 Jan 2020.
Vancouver:
Kelkar H. Boundary Marking of Phenomenon using Wireless Sensor
Networks. [Internet] [Masters thesis]. University of Cincinnati; 2009. [cited 2020 Jan 22].
Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258666674.
Council of Science Editors:
Kelkar H. Boundary Marking of Phenomenon using Wireless Sensor
Networks. [Masters Thesis]. University of Cincinnati; 2009. Available from: http://rave.ohiolink.edu/etdc/view?acc_num=ucin1258666674
NSYSU
11.
CHEN, CHUN-MAO.
Understanding the role of boundaries spanning in IT outsourcing project management.
Degree: Master, Information Management, 2014, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713114-203335
► With the advance of technology and Internet, information system (IS) has become prevalent in organizations nowadays. But not every company possesses capability to develop information…
(more)
▼ With the advance of technology and Internet, information system (IS) has become prevalent in organizations nowadays. But not every company possesses capability to develop information system independently. Therefore outsourcing of information system has become an important issue in both private and government organizations. However, there might be a lot of risks that caused by the divergence between venders and clients in the information system development process. This study aims to explore how an IS outsourcing project cross boundaries to reduce project risks, and further improve project performance and decrease delay. We review past studies of
boundary spanning and define three boundaries (social
boundary, knowledge
boundary, and operational
boundary) and the role, process, and objects of each
boundary. The study result, based on data collected from 105 IS outsourcing project developers, supports our hypotheses that effectively
boundary spanning can reduce project risks and lead to enhance project performance and decrease project delay. This study provides clear definition of social
boundary, knowledge
boundary, and operational
boundary for future studies. Also, the specific practices of role, process, and object provide practical implications for managers
Advisors/Committee Members: SHIH,SHENG-PAO (chair), Hui-Mei Hsu (chair), Hsieh-Hong Huang (chair), Shih-Chieh Hsu (committee member).
Subjects/Keywords: risks; operational boundary; knowledge boundary; information systems (IS) outsourcing; boundary spanning; social boundary
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Manager
APA (6th Edition):
CHEN, C. (2014). Understanding the role of boundaries spanning in IT outsourcing project management. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713114-203335
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):
CHEN, CHUN-MAO. “Understanding the role of boundaries spanning in IT outsourcing project management.” 2014. Thesis, NSYSU. Accessed January 22, 2020.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713114-203335.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
CHEN, CHUN-MAO. “Understanding the role of boundaries spanning in IT outsourcing project management.” 2014. Web. 22 Jan 2020.
Vancouver:
CHEN C. Understanding the role of boundaries spanning in IT outsourcing project management. [Internet] [Thesis]. NSYSU; 2014. [cited 2020 Jan 22].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713114-203335.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
CHEN C. Understanding the role of boundaries spanning in IT outsourcing project management. [Thesis]. NSYSU; 2014. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0713114-203335
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
NSYSU
12.
Tsai, Chia-chun.
A Study of the Problems and Influences of Team Boundary Spanning in the Different Phases of Information System Development Projects.
Degree: Master, Information Management, 2017, NSYSU
URL: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0114117-235653
► Given the high complexity of current information system development projects, it has been essential for development teams to assume a cross-disciplinary profile. However, the multitude…
(more)
▼ Given the high complexity of current information system development projects, it has been essential for development teams to assume a cross-disciplinary profile. However, the multitude of stakeholders involved in the development have divergent perceptions (knowledge boundaries) and modes of operation (operational boundaries), which can pose substantial challenges, or prevent the team from accessing or safeguarding the required resources (social boundaries). These are obstacles that can cause the project to fall behind schedule, overrun its budget, or even fail to achieve its goals. Therefore, mitigating the aforementioned boundaries is imperative to enhance project efficiency.
This study explored (1) the boundaries a project team would likely encounter in each phase of the development, and (2) which methods a team should adopt to traverse these boundaries to advance the project. A qualitative case study method was adopted to investigate project teams from three corporations, each developing a particular type of information system. More specifically, three team members in different positions were selected from each team for an in-depth interview. First, the
boundary problems encountered during the three primary phases in a system development project were identified. Subsequently, the system process, roles, and objects adopted to cross over the various boundaries were determined. The findings were aggregated for a meta-analysis to outline the boundaries encountered in each phase of an information system development project, as well as the issues pertaining to overcoming such boundaries.
The present study is expected to serve as a foundation for further investigations, and as practical reference for the development of information systems.
Advisors/Committee Members: Hsieh-Hong Huang (chair), Sheng-Pao Shih (chair), Shih-Chieh Hsu (committee member), Hui-Mei Hsu (chair).
Subjects/Keywords: boundary spanning; social boundary; operational boundary; knowledge boundary; information system development project; project development phase
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APA ·
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MLA ·
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CSE |
Export
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Manager
APA (6th Edition):
Tsai, C. (2017). A Study of the Problems and Influences of Team Boundary Spanning in the Different Phases of Information System Development Projects. (Thesis). NSYSU. Retrieved from http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0114117-235653
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):
Tsai, Chia-chun. “A Study of the Problems and Influences of Team Boundary Spanning in the Different Phases of Information System Development Projects.” 2017. Thesis, NSYSU. Accessed January 22, 2020.
http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0114117-235653.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Tsai, Chia-chun. “A Study of the Problems and Influences of Team Boundary Spanning in the Different Phases of Information System Development Projects.” 2017. Web. 22 Jan 2020.
Vancouver:
Tsai C. A Study of the Problems and Influences of Team Boundary Spanning in the Different Phases of Information System Development Projects. [Internet] [Thesis]. NSYSU; 2017. [cited 2020 Jan 22].
Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0114117-235653.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Tsai C. A Study of the Problems and Influences of Team Boundary Spanning in the Different Phases of Information System Development Projects. [Thesis]. NSYSU; 2017. Available from: http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0114117-235653
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universiteit Utrecht
13.
Mourik, A.L. van.
Boundary crossing en boundary objects in het middelbaar beroepsonderwijs.
Degree: 2016, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/335884
► Een tekort aan beroepskennis bij studenten in het beroepsonderwijs volgens een rapport van de Onderwijsraad, docenten in het beroepsonderwijs met te weinig actuele beroepskennis en…
(more)
▼ Een tekort aan beroepskennis bij studenten in het beroepsonderwijs volgens een rapport van de Onderwijsraad, docenten in het beroepsonderwijs met te weinig actuele beroepskennis en een onlangs herzien kwalificatiedossier voor opleidingen in het beroepsonderwijs zijn onderwerpen die de aanleiding vormen voor dit onderzoek. Uitgaande van de theorie van
boundary crossing is onderzocht hoe docenten in het middelbaar beroepsonderwijs en praktijkbegeleiders uit het bedrijfsleven zich herkennen in dit gebrek aan beroepskennis. Vervolgens is gekeken hoe docenten omgaan met deze discontinuïteit tussen middelbaar beroepsonderwijs en bedrijfsleven en tot slot is onderzocht of een herzien kwalificatiedossier docenten kan ondersteunen bij deze tekortkoming. Hiermee beoogt dit onderzoek meer inzicht te krijgen in de onbekende processen van
boundary crossing in het beroepsonderwijs. Om een goed beeld te krijgen van
boundary crossing in het beroepsonderwijs is een kwalitatief onderzoek uitgevoerd middels interviews onder docenten en praktijkbegeleiders. Het blijkt dat de docenten in het beroepsonderwijs zich over het algemeen herkennen in het tekort aan kennis bij studenten. Dit in tegenstelling tot de praktijkbegeleiders. Zij herkennen dit tekort aan beroepskennis bij studenten in mindere mate. Verder blijkt dat de docenten dit probleem hoofdzakelijk individueel aanpakken. Er vindt weinig communicatie plaats tussen de docenten onderling en er is weinig inhoudelijke communicatie met de praktijkbegeleiders. Tot slot blijkt dat een kleine meerderheid van docenten positief is over hoe een herzien kwalificatiedossier ondersteuning kan bieden bij een discontinuïteit van beroepskennis bij studenten.
Advisors/Committee Members: Khaled, A..
Subjects/Keywords: beroepskennis; beroepsonderwijs; boundary crossing; boundary crossers; boundary objects; discontinuïteit
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Manager
APA (6th Edition):
Mourik, A. L. v. (2016). Boundary crossing en boundary objects in het middelbaar beroepsonderwijs. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/335884
Chicago Manual of Style (16th Edition):
Mourik, A L van. “Boundary crossing en boundary objects in het middelbaar beroepsonderwijs.” 2016. Masters Thesis, Universiteit Utrecht. Accessed January 22, 2020.
http://dspace.library.uu.nl:8080/handle/1874/335884.
MLA Handbook (7th Edition):
Mourik, A L van. “Boundary crossing en boundary objects in het middelbaar beroepsonderwijs.” 2016. Web. 22 Jan 2020.
Vancouver:
Mourik ALv. Boundary crossing en boundary objects in het middelbaar beroepsonderwijs. [Internet] [Masters thesis]. Universiteit Utrecht; 2016. [cited 2020 Jan 22].
Available from: http://dspace.library.uu.nl:8080/handle/1874/335884.
Council of Science Editors:
Mourik ALv. Boundary crossing en boundary objects in het middelbaar beroepsonderwijs. [Masters Thesis]. Universiteit Utrecht; 2016. Available from: http://dspace.library.uu.nl:8080/handle/1874/335884
University of Wisconsin – Milwaukee
14.
Moran, Molly Ann.
On the Dimension of Group Boundaries.
Degree: PhD, Mathematics, 2015, University of Wisconsin – Milwaukee
URL: https://dc.uwm.edu/etd/900
► The goal of this dissertation is to find connections between the small-scale dimension (i.e. covering dimension and linearly controlled dimension) of group boundaries and…
(more)
▼ The goal of this dissertation is to find connections between the small-scale dimension (i.e. covering dimension and linearly controlled dimension) of group boundaries and the large scale dimension (i.e. asymptotic dimension and macroscopic dimension) of the group. We first show that generalized group boundaries must have finite covering dimension by using finite large-scale dimension of the space. We then restrict our attention to CAT(0) group boundaries and develop metrics on the
boundary that allow us to study the linearly controlled dimension. We then obtain results relating the linearly controlled dimension of CAT(0) boundaries to the large scale dimension of the CAT(0) space.
Advisors/Committee Members: Craig Guilbault.
Subjects/Keywords: Cat(0) Space; Group Boundary; Visual Boundary; Z-Boundary; Z-Structure; Mathematics
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Manager
APA (6th Edition):
Moran, M. A. (2015). On the Dimension of Group Boundaries. (Doctoral Dissertation). University of Wisconsin – Milwaukee. Retrieved from https://dc.uwm.edu/etd/900
Chicago Manual of Style (16th Edition):
Moran, Molly Ann. “On the Dimension of Group Boundaries.” 2015. Doctoral Dissertation, University of Wisconsin – Milwaukee. Accessed January 22, 2020.
https://dc.uwm.edu/etd/900.
MLA Handbook (7th Edition):
Moran, Molly Ann. “On the Dimension of Group Boundaries.” 2015. Web. 22 Jan 2020.
Vancouver:
Moran MA. On the Dimension of Group Boundaries. [Internet] [Doctoral dissertation]. University of Wisconsin – Milwaukee; 2015. [cited 2020 Jan 22].
Available from: https://dc.uwm.edu/etd/900.
Council of Science Editors:
Moran MA. On the Dimension of Group Boundaries. [Doctoral Dissertation]. University of Wisconsin – Milwaukee; 2015. Available from: https://dc.uwm.edu/etd/900
University of Edinburgh
15.
Mowat, Emma.
Making Psychology a Science: A Discourse Analysis upon the history of psychology within introductory psychology textbooks.
Degree: 2013, University of Edinburgh
URL: http://hdl.handle.net/1842/8694
► Abstract The history of psychology within introductory psychology textbooks is the focus of a discourse analysis (DA), to explore how it constructs the scientific status…
(more)
▼ Abstract
The history of psychology within introductory psychology textbooks is the focus of a discourse analysis (DA), to explore how it constructs the scientific status of the discipline that it is chronicling. Given the importance of Psychology’s scientific status to retain its cultural authority, and the lack of a clear demarcation between science and other forms of knowledge producing activities, there is a need to understand better how psychological knowledge came to be seen as scientific. The current projects proceeds on the constructivist premise that science is a contextual cultural phenomenon, rather than an immutable social structure. The history of psychology within introductory textbooks provides a site in which the social construction of science operates through the rhetorical process of
boundary work. With reference to specific extracts, the analysis will consider how five interrelated themes are deployed, and the rhetorical function they serve to present a particular version of psychology as a science. It is hoped that the paper will show how DA can offer an insight into the way in which the history of psychology does not just describe, but constructs psychology’s scientific status, and is thus a suitable approach to explore historical and conceptual issues.
Advisors/Committee Members: Lamont, Paul.
Subjects/Keywords: discourse analysis; boundary work
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APA ·
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Manager
APA (6th Edition):
Mowat, E. (2013). Making Psychology a Science: A Discourse Analysis upon the history of psychology within introductory psychology textbooks. (Thesis). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/8694
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):
Mowat, Emma. “Making Psychology a Science: A Discourse Analysis upon the history of psychology within introductory psychology textbooks.” 2013. Thesis, University of Edinburgh. Accessed January 22, 2020.
http://hdl.handle.net/1842/8694.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mowat, Emma. “Making Psychology a Science: A Discourse Analysis upon the history of psychology within introductory psychology textbooks.” 2013. Web. 22 Jan 2020.
Vancouver:
Mowat E. Making Psychology a Science: A Discourse Analysis upon the history of psychology within introductory psychology textbooks. [Internet] [Thesis]. University of Edinburgh; 2013. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1842/8694.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mowat E. Making Psychology a Science: A Discourse Analysis upon the history of psychology within introductory psychology textbooks. [Thesis]. University of Edinburgh; 2013. Available from: http://hdl.handle.net/1842/8694
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Ontario Institute of Technology
16.
Parvin, Nurjahan.
Robust curved road boundary identification using hierarchical clustering.
Degree: 2013, University of Ontario Institute of Technology
URL: http://hdl.handle.net/10155/363
► We develop a new method for automatic curved road boundary detection in images captured by traffic cameras. The proposed method combines data driven (edge segments)…
(more)
▼ We develop a new method for automatic curved road
boundary detection in images captured by
traffic cameras. The proposed method combines data driven (edge segments) and model based
(2nd degree polynomial models for road boundaries) techniques to identify dominant road
boundary in images exhibiting extreme weather conditions, low visibility and poor lighting.
The proposed method constructs a ranked list of possible road boundaries through agglomerative
hierarchical clustering of edge segments. Each node in the hierarchical clustering is a
potential road
boundary. Top ranked road boundaries are paired with each other to identify potential
road regions. The road regions are then ranked using appearance and perspective cues
and the top ranked road region is used to construct the dominant road
boundary in the image.
We evaluate our method on a realistic dataset captured by traffic cameras managed by Ontario???s
Ministry of Transportation.
Advisors/Committee Members: Pu, Ken, Qureshi, Faisal.
Subjects/Keywords: Road boundary; Hierarchical clustering
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APA ·
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MLA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Parvin, N. (2013). Robust curved road boundary identification using hierarchical clustering. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/363
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):
Parvin, Nurjahan. “Robust curved road boundary identification using hierarchical clustering.” 2013. Thesis, University of Ontario Institute of Technology. Accessed January 22, 2020.
http://hdl.handle.net/10155/363.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Parvin, Nurjahan. “Robust curved road boundary identification using hierarchical clustering.” 2013. Web. 22 Jan 2020.
Vancouver:
Parvin N. Robust curved road boundary identification using hierarchical clustering. [Internet] [Thesis]. University of Ontario Institute of Technology; 2013. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/10155/363.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Parvin N. Robust curved road boundary identification using hierarchical clustering. [Thesis]. University of Ontario Institute of Technology; 2013. Available from: http://hdl.handle.net/10155/363
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
17.
Yumashev, Dmitry.
Viscous-inviscid interaction in a transonic flow caused by a discontinuity in wall curvature.
Degree: PhD, 2010, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:87020
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509398
► The work addresses an important question of whether a discontinuity in wall curvature can cause boundary layer separation at transonic speeds. Firstly an inviscid transonic…
(more)
▼ The work addresses an important question of whether a discontinuity in wall curvature can cause boundary layer separation at transonic speeds. Firstly an inviscid transonic flow in the vicinity of a curvature break is analysed. Depending on the ratio of the curvatures, several physically different regimes can exist, including a special type of supersonic flows which decelerate to subsonic speeds without a shock wave, transonic Prandtl-Meyer flow and supersonic flows with a weak shock. It is shown that if the flow can be extended beyond the limiting characteristic, it subsequently develops a shock wave. As a consequence, a fundamental link between the local and the global flow patterns is observed in our problem. From an asymptotic analysis of the Karman-Guderley equation it follows that the curvature discontinuity leads to singular pressure gradients upstream and downstream of the break point. To find these gradients, we perform computations and employ both the hodograph method and the phase portrait technique. The focus is then turned to analysing how the given pressure distribution affects the boundary layer. It is demonstrated that the singular pressure gradient, which appears to be proportional to the inverse cubic root of the distance form the curvature break, corresponds to a special resonant case for the boundary layer upstream of the singularity. Consequently, the boundary layer approaches the interaction region in a pre-separated form. This changes the background on which the viscous-inviscid interaction develops, allowing to construct an asymptotic theory of the incipient viscous-inviscid interaction for our particular problem. The analysis of the interaction which takes place near a weak curvature discontinuity leads to a typical three-tier structure. It appears to be possible to obtain analytical solutions in all the tiers of the triple deck when the curvature break is small. As a result, the interaction equation may be derived in a closed form. The analytical solution of the interaction equation reveals a local minimum in the skin friction distribution, suggesting that a local recirculation zone can develop near the curvature break. In fact, the recirculation zone is formed when the ratio of the curvatures is represented as a series based on negative powers of the logarithm of the Reynolds number. This proves that a discontinuity in wall curvature does evoke boundary layer separation at transonic speeds. The result is fundamentally different from the effect of a curvature break at subsonic and supersonic speeds, as no separation takes place in these two regimes (Messiter & Hu 1975).
Subjects/Keywords: 519; transonic boundary layer separation
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APA (6th Edition):
Yumashev, D. (2010). Viscous-inviscid interaction in a transonic flow caused by a discontinuity in wall curvature. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:87020 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509398
Chicago Manual of Style (16th Edition):
Yumashev, Dmitry. “Viscous-inviscid interaction in a transonic flow caused by a discontinuity in wall curvature.” 2010. Doctoral Dissertation, University of Manchester. Accessed January 22, 2020.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:87020 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509398.
MLA Handbook (7th Edition):
Yumashev, Dmitry. “Viscous-inviscid interaction in a transonic flow caused by a discontinuity in wall curvature.” 2010. Web. 22 Jan 2020.
Vancouver:
Yumashev D. Viscous-inviscid interaction in a transonic flow caused by a discontinuity in wall curvature. [Internet] [Doctoral dissertation]. University of Manchester; 2010. [cited 2020 Jan 22].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:87020 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509398.
Council of Science Editors:
Yumashev D. Viscous-inviscid interaction in a transonic flow caused by a discontinuity in wall curvature. [Doctoral Dissertation]. University of Manchester; 2010. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:87020 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.509398
University of Alberta
18.
Mukherjee, Satarupa.
A Novel Framework for Unique People Count from Monocular
Videos.
Degree: PhD, Department of Computing Science, 2014, University of Alberta
URL: https://era.library.ualberta.ca/files/2f75r8900
► Counting unique number of people in a video (i.e., counting a person only once while the person passes through the field of view (FOV)), is…
(more)
▼ Counting unique number of people in a video (i.e.,
counting a person only once while the person passes through the
field of view (FOV)), is required in many video analytic
applications, such as transit passenger and pedestrian volume count
in railway stations, malls and road intersections, aid in security
and resource management, urban planning, advertising and many
others. In this PhD thesis I have developed a robust algorithm to
generate unique people count from monocular videos taken from an
arbitrary angle. From applications point of view, my algorithm is
one of the most economical ones, because it can work with existing
video cameras already mounted. Within a region of interest (ROI) on
the FOV of the camera, I compute influx/outflux rate of people,
i.e., number of people coming in or going out of the ROI per unit
time. Then, I sum the influx/outflux rate between any two time
points to estimate the number of people that entered and/or left
the ROI within that time interval. I employ two well-known computer
vision techniques for this purpose: Gaussian process regression
(GPR) to estimate the number of people present within a ROI and
optical flow-based tracking of the boundary of the ROI. The
principle roadblock in most of computer vision problems is
occlusion. To avoid this bottleneck, we adopt the combination of
(a) the concept of influx and outflux of fluid mass from
computational fluidics, (b) the GPR to estimate the number of
people within a ROI and (c) ROI boundary tracking (as opposed to
object or feature tracking) for a short period. Thus, the principal
contribution of the thesis is to successfully handle occlusions by
computing the average influx and/or outflux of people and avoiding
people detection and tracking. We validate the proposed algorithm
on 19 publicly available monocular benchmark videos. Occlusions are
abundant in these videos, yet we obtain more than 95% accuracy for
most of these videos. We also extend our proposed framework beyond
monocular videos and apply it on multiple views of a publicly
available dataset with about 99% accuracy.
Subjects/Keywords: boundary tracking; occlusion; people counting
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APA (6th Edition):
Mukherjee, S. (2014). A Novel Framework for Unique People Count from Monocular
Videos. (Doctoral Dissertation). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/2f75r8900
Chicago Manual of Style (16th Edition):
Mukherjee, Satarupa. “A Novel Framework for Unique People Count from Monocular
Videos.” 2014. Doctoral Dissertation, University of Alberta. Accessed January 22, 2020.
https://era.library.ualberta.ca/files/2f75r8900.
MLA Handbook (7th Edition):
Mukherjee, Satarupa. “A Novel Framework for Unique People Count from Monocular
Videos.” 2014. Web. 22 Jan 2020.
Vancouver:
Mukherjee S. A Novel Framework for Unique People Count from Monocular
Videos. [Internet] [Doctoral dissertation]. University of Alberta; 2014. [cited 2020 Jan 22].
Available from: https://era.library.ualberta.ca/files/2f75r8900.
Council of Science Editors:
Mukherjee S. A Novel Framework for Unique People Count from Monocular
Videos. [Doctoral Dissertation]. University of Alberta; 2014. Available from: https://era.library.ualberta.ca/files/2f75r8900
Texas A&M University
19.
Smith, Jason D.
Bijective Parameterization with Free Boundaries.
Degree: 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/156497
► When displaying 3D surfaces onto computer screens, additional information is often mapped onto the surface to enhance the quality of the rendering. Surface parameterization generates…
(more)
▼ When displaying 3D surfaces onto computer screens, additional information is often mapped onto the surface to enhance the quality of the rendering. Surface parameterization generates a correspondence, or mapping, between the 3D surface and 2D parameterization space. This mapping has many applications in computer graphics, but in most cases cannot be performed without introducing large distortions in the 2D parameterization. Along with problems of distortion, the mapping of the 2D space to 3D for many applications can be invalidated if the property of bijectivity is violated. While there is previous research guaranteeing bijectivity, these methods must constrain or modify the
boundary of the 2D parameterization. This dissertation, describes a fully automatic method for generating guaranteed bijective surface parameterizations from triangulated 3D surfaces. In particular, a new isometric distortion energy metric is introduced preventing local folds of triangles in the parameterization as well as a barrier function that prevents intersection of the 2D boundaries. By using a computationally e?cient isometric metric energy, the dissertation achieves fast and comparable optimization times to previous methods. The
boundary of the parameterization is free to change shape during the optimization to minimize distortion. A new optimization approach is introduced called singularity aware optimization and in conjunction with an interior point approach and barrier energy functions guarantee bijectivity. This optimization framework is then modi?ed to allow for an importance weighting allowing for customizable and more e?cient texel usage.
Advisors/Committee Members: Schaefer, Scott (advisor), Keyser, John (committee member), Chai, Jinxiang (committee member), Akleman, Ergun (committee member).
Subjects/Keywords: Parameterization; Bijectivity; Boundary; Mapping
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CSE |
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to Zotero / EndNote / Reference
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APA (6th Edition):
Smith, J. D. (2015). Bijective Parameterization with Free Boundaries. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/156497
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):
Smith, Jason D. “Bijective Parameterization with Free Boundaries.” 2015. Thesis, Texas A&M University. Accessed January 22, 2020.
http://hdl.handle.net/1969.1/156497.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Jason D. “Bijective Parameterization with Free Boundaries.” 2015. Web. 22 Jan 2020.
Vancouver:
Smith JD. Bijective Parameterization with Free Boundaries. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1969.1/156497.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith JD. Bijective Parameterization with Free Boundaries. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/156497
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
20.
Dadi, Sireesh Kumar.
A Study to Verify the Material Surface Concept of Water Table by Examining Analytical and Numerical Models.
Degree: 2011, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8243
► The highly nonlinear nature of unsaturated flow results in different ways to approximate the delayed or instantaneous movement of the water table. In nearly all…
(more)
▼ The highly nonlinear nature of unsaturated flow results in different ways to approximate the delayed or instantaneous movement of the water table. In nearly all the approaches, the water table is conceptually treated as a ?material surface?. This term defines the water table as having two simultaneous properties: 1) the pressure along the surface is atmospheric pressure, and 2) the water table is fixed to the material, i.e., a set of water particles. This article makes an attempt to explain that the water table, defined as the surface at atmospheric pressure, is not a material
boundary, and the water table can move independent of the water particles.
Velocity of the water table and velocity of drainage are compared with three analytical models: the Neuman model, which assumes instantaneous drainage from the unsaturated zone; the Moench model, which considered gradual drainage from the unsaturated zone using a series of exponential terms in the water table
boundary condition; and the Mathias-Butler model, which obtained a new drainage function based on a linearized Richard?s equation but limited the variation of soil moisture and hydraulic conductivity in the unsaturated zone to exponential functions. Numerical analysis was conducted with VS2DT and both the numerical and the analytical results were compared with a 7-day, constant rate pumping test conducted by University of Waterloo researchers at Canadian Air Force Base Borden in Ontario, Canada.
Advisors/Committee Members: Zhan, Hing-Bin (advisor), Sparks, David (advisor), Sun, Yuefeng (committee member).
Subjects/Keywords: material boundary; water table
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APA (6th Edition):
Dadi, S. K. (2011). A Study to Verify the Material Surface Concept of Water Table by Examining Analytical and Numerical Models. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8243
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):
Dadi, Sireesh Kumar. “A Study to Verify the Material Surface Concept of Water Table by Examining Analytical and Numerical Models.” 2011. Thesis, Texas A&M University. Accessed January 22, 2020.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8243.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Dadi, Sireesh Kumar. “A Study to Verify the Material Surface Concept of Water Table by Examining Analytical and Numerical Models.” 2011. Web. 22 Jan 2020.
Vancouver:
Dadi SK. A Study to Verify the Material Surface Concept of Water Table by Examining Analytical and Numerical Models. [Internet] [Thesis]. Texas A&M University; 2011. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8243.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Dadi SK. A Study to Verify the Material Surface Concept of Water Table by Examining Analytical and Numerical Models. [Thesis]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-08-8243
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
21.
Fulkerson, Michael C.
Radial limits of holomorphic functions on the ball.
Degree: 2008, Texas A&M University
URL: http://hdl.handle.net/1969.1/86034
► In this dissertation, we consider various aspects of the boundary behavior of holomorphic functions of several complex variables. In dimension one, a characterization of the…
(more)
▼ In this dissertation, we consider various aspects of the
boundary behavior of holomorphic
functions of several complex variables. In dimension one, a characterization
of the radial limit zero sets of nonconstant holomorphic functions on the disc has
been given by Lusin, Privalov, McMillan, and Berman. In higher dimensions, no such
characterization is known for holomorphic functions on the unit ball B. Rudin posed
the question as to the existence of nonconstant holomorphic functions on the ball
with radial limit zero almost everywhere. Hakim, Sibony, and Dupain showed that
such functions exist. Because the characterization in dimension one involves both
Lebesgue measure and Baire category, it is natural to also ask whether there exist
nonconstant holomorphic functions on the ball having residual radial limit zero sets.
We show here that such functions exist. We also prove a higher dimensional version
of the Lusin-Privalov Radial Uniqueness Theorem, but we show that, in contrast to
what is the case in dimension one, the converse does not hold. We show that any
characterization of radial limit zero sets on the ball must take into account the "complex structure" on the ball by giving an example that shows that the family of these sets is not closed under orthogonal transformations of the underlying real coordinates.
In dimension one, using the theorem of McMillan and Berman, it is easy to see that
radial limit zero sets are not closed under unions (even finite unions). Since there is
no analogous result in higher dimensions of the McMillan and Berman result, it is not obvious whether the radial limit zero sets in higher dimensions are closed under finite unions. However, we show that, as is the case in dimension one, these sets are
not closed under finite unions. Finally, we show that there are smooth curves of finite
length in S that are non-tangential limit uniqueness sets for holomorphic functions
on B. This strengthens a result of M. Tsuji.
Advisors/Committee Members: Boas, Harold P. (advisor), Cline, Daren B. H. (committee member), Smith, Roger (committee member), Straube, Emil J. (committee member).
Subjects/Keywords: radial limits; holomorphic; boundary behavior
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Fulkerson, M. C. (2008). Radial limits of holomorphic functions on the ball. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/86034
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):
Fulkerson, Michael C. “Radial limits of holomorphic functions on the ball.” 2008. Thesis, Texas A&M University. Accessed January 22, 2020.
http://hdl.handle.net/1969.1/86034.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Fulkerson, Michael C. “Radial limits of holomorphic functions on the ball.” 2008. Web. 22 Jan 2020.
Vancouver:
Fulkerson MC. Radial limits of holomorphic functions on the ball. [Internet] [Thesis]. Texas A&M University; 2008. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1969.1/86034.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Fulkerson MC. Radial limits of holomorphic functions on the ball. [Thesis]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/86034
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
22.
Downs, Robert 1982-.
Environmental Influences on Crossflow Instability.
Degree: 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/148060
► The laminar-to-turbulent transition process in swept-wing boundary layers is often dominated by an inflectional instability arising from crossflow. It is now known that freestream turbulence…
(more)
▼ The laminar-to-turbulent transition process in swept-wing
boundary layers is often dominated by an inflectional instability arising from crossflow. It is now known that freestream turbulence and surface roughness are two of the key disturbance sources in the crossflow instability problem. Recent experimental findings have suggested that freestream turbulence of low intensity (less than 0.2%) may have a larger influence on crossflow instability than was previously thought. The present work involves experimental measurement of stationary and traveling crossflow mode amplitudes in freestream turbulence levels between 0.02% and 0.2%. A 1.83 m chord, 45-degree swept-wing model is used in the Klebanoff-Saric Wind Tunnel to perform these experiments. The turbulence intensity and length scales are documented. Although a significant amount of research on the role of turbulence has been completed at higher turbulence levels, comparatively little has been done at the low levels of the present experiments, which more closely reflect the flight environment. It is found that growth of the traveling crossflow mode is highly dependent on small changes to the freestream turbulence. Additionally, previously studied attenuation of saturated stationary disturbance amplitudes is observed at these low turbulence levels. The extent of laminar flow is also observed to decrease in moderate freestream turbulence.
Advisors/Committee Members: White, Edward (advisor), Bowersox, Rodney (committee member), Duggleby, Andrew (committee member), Saric, William (committee member).
Subjects/Keywords: boundary-layer stability; Crossflow instability
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APA (6th Edition):
Downs, R. 1. (2012). Environmental Influences on Crossflow Instability. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/148060
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):
Downs, Robert 1982-. “Environmental Influences on Crossflow Instability.” 2012. Thesis, Texas A&M University. Accessed January 22, 2020.
http://hdl.handle.net/1969.1/148060.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Downs, Robert 1982-. “Environmental Influences on Crossflow Instability.” 2012. Web. 22 Jan 2020.
Vancouver:
Downs R1. Environmental Influences on Crossflow Instability. [Internet] [Thesis]. Texas A&M University; 2012. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1969.1/148060.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Downs R1. Environmental Influences on Crossflow Instability. [Thesis]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/148060
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
23.
Peltier, Scott Jacob.
Behavior of Turbulent Structures within a Mach 5 Mechanically Distorted Boundary Layer.
Degree: 2013, Texas A&M University
URL: http://hdl.handle.net/1969.1/151397
► High-resolution particle image velocimetry (PIV) is employed to resolve the velocity fields within a Mach 4.9 mechanically distorted turbulent boundary layer (Re? ? 40,000). The…
(more)
▼ High-resolution particle image velocimetry (PIV) is employed to resolve the velocity fields within a Mach 4.9 mechanically distorted turbulent
boundary layer (Re? ? 40,000). The goal of this study is to directly observe the mechanisms responsible for the modified turbulent stresses present in mechanically distorted
boundary layers. This is achieved by measuring the effects of the mechanical distortions upon the distribution, population, size, orientation, and energy content of the turbulent structures, and how the perturbed state of these structures is manifested within the ensemble-averaged turbulent stresses. The two mechanical distortions under investigation are 1) streamline curvature-induced favorable pressure gradients (Ip = {-0.08; -0.49}), and 2) periodic arrays of diamond roughness elements (k/? ? 0.07). A smooth-wall, flat-plate
boundary layer is also included to establish the unperturbed state of the turbulent structures. The response of the mean turbulence statistics is investigated through ensemble-averaged profiles of Reynolds stresses, indicating the respective influences of pressure gradient effects and surface roughness upon the turbulent statistics. The distortion and reorientation of the large-scale coherent motions is quantified through the determination of the integral length scale and local structure angle from two-point correlations. Detection of individual vortices through the swirling strength criterion ?ci allows the population distribution of the turbulent eddies to be examined, along with the conditionally averaged hairpin structure.
The baseline and rough-wall stresses showed good agreement when scaled by the smooth-wall friction velocity. Two-point correlations indicate that the reorientation of the large-scale [i.e. O(?)] coherent structures, coupled with the modified wall-normal fluctuations, is primarily responsible for the modification of the rough-wall Reynolds stresses. The reduced Reynolds stresses observed in the favorable pressure gradients is partially due to the attenuation of the local flowfield around the near-wall hairpin structures, mitigating the mechanism for ?producing? turbulence. The rotational rate of the hairpin vortices, measured through the mean prograde swirling strength, was reduced for the favorable pressure gradient models.
Advisors/Committee Members: Bowersox, Rodney D.W. (advisor), White, Edward B. (committee member), Rediniotis, Othon K. (committee member), North, Simon W. (committee member).
Subjects/Keywords: boundary layer; turbulence; coherent structures
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Peltier, S. J. (2013). Behavior of Turbulent Structures within a Mach 5 Mechanically Distorted Boundary Layer. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151397
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):
Peltier, Scott Jacob. “Behavior of Turbulent Structures within a Mach 5 Mechanically Distorted Boundary Layer.” 2013. Thesis, Texas A&M University. Accessed January 22, 2020.
http://hdl.handle.net/1969.1/151397.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Peltier, Scott Jacob. “Behavior of Turbulent Structures within a Mach 5 Mechanically Distorted Boundary Layer.” 2013. Web. 22 Jan 2020.
Vancouver:
Peltier SJ. Behavior of Turbulent Structures within a Mach 5 Mechanically Distorted Boundary Layer. [Internet] [Thesis]. Texas A&M University; 2013. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1969.1/151397.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Peltier SJ. Behavior of Turbulent Structures within a Mach 5 Mechanically Distorted Boundary Layer. [Thesis]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151397
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
24.
Kuester, Matthew Scott.
Distributed Roughness Receptivity in a Flat Plate Boundary Layer.
Degree: 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/152606
► Surface roughness can affect boundary layer transition by acting as a receptivity mechanism for transient growth. Several experiments have investigated transient growth created by discrete…
(more)
▼ Surface roughness can affect
boundary layer transition by acting as a receptivity mechanism for transient growth. Several experiments have investigated transient growth created by discrete roughness elements; however, very few experiments have studied transient growth initiated by distributed surface roughness. Some of the work in this field predicts a "shielding" effect, where smaller distributed roughness displaces the
boundary layer away from the wall and shields larger roughness peaks from the incoming
boundary layer.
This dissertation describes an experiment specifically designed to study the shielding effect. Three roughness configurations, a deterministic distributed roughness patch, a slanted rectangle, and the combination of the two, were manufactured using rapid prototyping and installed flush with the wall in a flat plate
boundary layer. The main objective was to compare the wakes of the discrete roughness and the combined roughness to examine if the distributed roughness shields the discrete roughness. Naphthalene flow visualization and hotwire anemometry were used to characterize
the
boundary layer in the wakes of the different roughness configurations.
For roughness Reynolds numbers (Re_(k)) between 113 and 230, the distributed roughness initiated small amplitude disturbances that underwent transient growth. The discrete roughness element created a pair of high- and low-speed streaks in the
boundary layer at a sub-critical Reynolds number (Re_(k) = 151). At a higher Reynolds number (Re_(k) = 220), the discrete element created a turbulent wedge 15
boundary layer thicknesses downstream.
When the distributed roughness was added around the discrete roughness, the wake amplitude decreased at the sub-critical Reynolds number, and transition was delayed by two
boundary layer thicknesses at the higher Reynolds number. The distributed roughness redirects energy from longer spanwise wavelength modes to shorter spanwise wavelength modes. The presence of the distributed roughness also decreased the growth rate of secondary instabilities in the roughness wake.
This dissertation documents the first detailed measurements of transient growth over streamwise-extended distributed roughness and demonstrates that the shielding effect has the potential to delay roughness-induced transition. The results from this experiment lay the ground work for future studies of roughness receptivity and transient growth.
Advisors/Committee Members: White, Edward B (advisor), Saric, William S (committee member), Bowersox, Rodney (committee member), Morrison, Gerald (committee member).
Subjects/Keywords: Boundary Layers; Roughness; Transition
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MLA ·
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Manager
APA (6th Edition):
Kuester, M. S. (2014). Distributed Roughness Receptivity in a Flat Plate Boundary Layer. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/152606
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):
Kuester, Matthew Scott. “Distributed Roughness Receptivity in a Flat Plate Boundary Layer.” 2014. Thesis, Texas A&M University. Accessed January 22, 2020.
http://hdl.handle.net/1969.1/152606.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Kuester, Matthew Scott. “Distributed Roughness Receptivity in a Flat Plate Boundary Layer.” 2014. Web. 22 Jan 2020.
Vancouver:
Kuester MS. Distributed Roughness Receptivity in a Flat Plate Boundary Layer. [Internet] [Thesis]. Texas A&M University; 2014. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1969.1/152606.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Kuester MS. Distributed Roughness Receptivity in a Flat Plate Boundary Layer. [Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/152606
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
25.
Zhang, Wenxia.
Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf.
Degree: 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155027
► The bottom boundary layer is an unstratified thin layer above the sea floor, separated from the more strongly stratified interior. Formation of a thin bottom…
(more)
▼ The bottom
boundary layer is an unstratified thin layer above the sea floor, separated from the more strongly stratified interior. Formation of a thin bottom
boundary layer in the presence of stratification and a sloping bottom is common, and well characterized by theory. This thin layer is an important source of mixing over the continental shelf, and it plays a fundamental role in several continental shelf physical and biogeochemical processes, such as buoyancy advection, bottom material transport and hypoxia formation.
In this research, Both observations and numerical models are used to study models' ability of reproducing observed stratification and bottom
boundary layer dynamics over the Texas-Louisiana shelf. Simulated vertical stratification, which is also representing the vertical density structure, was first evaluated since it directly controls the bottom
boundary layer structure itself and is important for other bottom
boundary layer dynamics. A new metric, the histogram of vertical stratification, is introduced in this research to evaluate the models' ability of reproducing observed stratification in a bulk sense. The improvement in model performance is attributed to the finer horizontal and temporal resolutions of a model, while factors like open
boundary conditions and vertical resolutions are modified without any improvement in the ability of the model to simulate observed stratification. Towed, undulating CTD profiles collected during Mechanisms Controlling Hypoxia (MCH) program also detected mid-water oxygen minima in many transects. These intrusions are connected with the bottom
boundary layer and follows the pycnocline seaward as a mid-water column tongue of low oxygen. We calculate convergence within the bottom
boundary layer relative to density surfaces using the simulated results; there is a convergence in the bottom
boundary layer at the location where the pycnocline intercepts the bottom, creating an injection of bottom
boundary layer water into the pycnocline. Convergent flow at the bottom, relative to isopycnal surfaces, is strongest in the density classes associated with the oxygen minimum layer. We believe these mid-water oxygen minima are actually intrusions of low oxygen protruding from the bottom
boundary layer via buoyancy advection driven convergence, following the main pycnocline.
Advisors/Committee Members: Hetland, Robert D. (advisor), Lin, Xiaopei (advisor), DiMarco, Steven F. (committee member), Socolofsky, Scott A. (committee member).
Subjects/Keywords: stratification; bottom boundary layer
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APA (6th Edition):
Zhang, W. (2015). Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf. (Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155027
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):
Zhang, Wenxia. “Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf.” 2015. Thesis, Texas A&M University. Accessed January 22, 2020.
http://hdl.handle.net/1969.1/155027.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zhang, Wenxia. “Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf.” 2015. Web. 22 Jan 2020.
Vancouver:
Zhang W. Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf. [Internet] [Thesis]. Texas A&M University; 2015. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1969.1/155027.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zhang W. Stratification Prediction and Bottom Boundary Layer Dynamics over the Texas-Louisiana Continental Shelf. [Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155027
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Aberdeen
26.
Sparrow, Kathryn.
The effect of bed permeability on oscillatory boundary layer flow.
Degree: PhD, 2013, University of Aberdeen
URL: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201986
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582722
► Oscillatory boundary layer flow is found under waves in the near shore region. This region is responsible for large volumes of sediment transport and whilst…
(more)
▼ Oscillatory boundary layer flow is found under waves in the near shore region. This region is responsible for large volumes of sediment transport and whilst a large number of studies have investigated the broader problem only a handful of studies have investigated the boundary layer flow in detail. Most of these studies have also only considered boundary layer flow over rough impermeable beds and therefore do not take into account the potential effect of the flow interaction with a permeable bed. Similar studies in other felds of environmental fluid mechanics have concluded that the presence of a permeable bed can lead to significant diff erence in the boundary layer hydrodynamics when compared to the equivalent flow over an impermeable bed. This thesis presents a series of laboratory experiments that have been conducted over an impermeable gravel bed and a permeable gravel bed to identify the differences in the boundary layer hydrodynamics with a particular reference to the differences in the horizontal velocity profile, the shear stress, turbulence and the bed friction factor. The results indicate that a difference exists in the near-bed flow between the two bed cases. The results also demonstrate that the magnitude of the differences vary with flow Reynolds number, so the more energetic the wave the larger the impact of the permeable bed. The bed shear stress and resulting friction factor was found to be 40% greater for the flows over the permeable bed for the most energetic test case whilst the friction factor for the two bed cases for the least energetic test case are similar. The results also indicate that the permeable bed introduces an unexpected asymmetry in the flow cycle. This is attributed to the high vertical velocities that have been observed. A second series of experiments have been conducted to shed light on the interaction between the flow above the bed and within the bed to help explain the results from the initial gravel-bed experiments. The second series of experiments have been conducted over a regular permeable bed that allows for velocity measurements within the pores. The results indicate that the horizontal velocity, shear stress and turbulence all display signs of being effected by the exchange of flow, or ventilation, that naturally occurs.
Subjects/Keywords: 620; Boundary layer; Porous materials
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APA (6th Edition):
Sparrow, K. (2013). The effect of bed permeability on oscillatory boundary layer flow. (Doctoral Dissertation). University of Aberdeen. Retrieved from http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201986 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582722
Chicago Manual of Style (16th Edition):
Sparrow, Kathryn. “The effect of bed permeability on oscillatory boundary layer flow.” 2013. Doctoral Dissertation, University of Aberdeen. Accessed January 22, 2020.
http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201986 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582722.
MLA Handbook (7th Edition):
Sparrow, Kathryn. “The effect of bed permeability on oscillatory boundary layer flow.” 2013. Web. 22 Jan 2020.
Vancouver:
Sparrow K. The effect of bed permeability on oscillatory boundary layer flow. [Internet] [Doctoral dissertation]. University of Aberdeen; 2013. [cited 2020 Jan 22].
Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201986 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582722.
Council of Science Editors:
Sparrow K. The effect of bed permeability on oscillatory boundary layer flow. [Doctoral Dissertation]. University of Aberdeen; 2013. Available from: http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=201986 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.582722
Brunel University
27.
Farsimadan, Ehsaan.
A study of the turbulent wake of an airfoil in an air stream with a 90° curvature using hot-wire anemometry and large eddy simulation.
Degree: PhD, 2008, Brunel University
URL: http://bura.brunel.ac.uk/handle/2438/3612
;
http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501575
► The broad aim of the work presented in this thesis is to investigate the wake of an airfoil under the combined effects of streamwise curvature…
(more)
▼ The broad aim of the work presented in this thesis is to investigate the wake of an airfoil under the combined effects of streamwise curvature and pressure gradient. This was accomplished by an experimental investigation using hot-wire anemometry and large eddy simulation (LES). The wake was generated by placing a NACA 0012 airfoil in a uniform stream of air, which is then subjected to an abrupt 90o curvature created by a duct bend. The experimental work was conducted in a subsonic open-return type wind tunnel. The test section measured 457 mm × 457 mm in cross-section and consisted of a 90o bend with radius-to-height ratio of 1.17. The symmetrical airfoil was of chord length (c) 150 mm, and its trailing edge was located one chord length upstream of the bend entry. The effects of airfoil angle of attack and mainstream velocity on the mean velocity and turbulence quantities of the near-wake were examined. In addition, the mean velocity and turbulence intensity profiles of the boundary layer on the upper surface of the airfoil were measured. In the numerical investigation, the three-dimensional, incompressible turbulent flow in the duct was computed using the finite volume method. The effect of modelling parameters, namely, grid resolution and sub-grid scale (SGS) model were studied. Three different sub-grid scale models were employed, namely, the classical Smagorinsky, its dynamic variant (DSMG) and the dynamic kinetic energy transport. The effect of grid resolution was assessed by conducting simulations with the DSMG model on three different grids. The first two grids incorporated the full spanwise extent of the duct (3c), and the third grid comprised a reduced spanwise segment (0.5c) with periodic conditions set in the spanwise direction. A bounded central differencing scheme was employed for the discretization of the convection terms. The temporal discretization was by a second-order implicit method that incorporated a forward difference approximation. The performance of LES in depicting the experimental flow was assessed and compared with the results predicted by the Reynolds Stress Model. The experimental profiles at zero angle of attack revealed the differing effects of curvature on the mean and turbulence quantities in the inner-side and outer-side of the wake. The spanwise distributions of mean velocity and turbulence intensity, in the near-wake, indicated variations with identifiable peaks and troughs which corresponded to the presence of streamwise vortices in the wake. The spanwise variations were larger on the inner side of the wake and significantly reduced on the outer side. The results showed that close to the trailing edge, the dominant effect on the wake was from the airfoil boundary layer, whereas one chord length downstream of the trailing edge, it was the effect of curvature and pressure gradient from the duct which was dominant. The results from the numerical study showed the advantages of LES over Reynolds-averaged Navier-Stokes methods in predicting separation on the convex wall of the bend on…
Subjects/Keywords: 629.134; wind tunnel; boundary layers
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APA (6th Edition):
Farsimadan, E. (2008). A study of the turbulent wake of an airfoil in an air stream with a 90° curvature using hot-wire anemometry and large eddy simulation. (Doctoral Dissertation). Brunel University. Retrieved from http://bura.brunel.ac.uk/handle/2438/3612 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501575
Chicago Manual of Style (16th Edition):
Farsimadan, Ehsaan. “A study of the turbulent wake of an airfoil in an air stream with a 90° curvature using hot-wire anemometry and large eddy simulation.” 2008. Doctoral Dissertation, Brunel University. Accessed January 22, 2020.
http://bura.brunel.ac.uk/handle/2438/3612 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501575.
MLA Handbook (7th Edition):
Farsimadan, Ehsaan. “A study of the turbulent wake of an airfoil in an air stream with a 90° curvature using hot-wire anemometry and large eddy simulation.” 2008. Web. 22 Jan 2020.
Vancouver:
Farsimadan E. A study of the turbulent wake of an airfoil in an air stream with a 90° curvature using hot-wire anemometry and large eddy simulation. [Internet] [Doctoral dissertation]. Brunel University; 2008. [cited 2020 Jan 22].
Available from: http://bura.brunel.ac.uk/handle/2438/3612 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501575.
Council of Science Editors:
Farsimadan E. A study of the turbulent wake of an airfoil in an air stream with a 90° curvature using hot-wire anemometry and large eddy simulation. [Doctoral Dissertation]. Brunel University; 2008. Available from: http://bura.brunel.ac.uk/handle/2438/3612 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501575
Oregon State University
28.
Smoot, Alexander R.
Linking dynamics of the near-surface flow to deeper boundary layer forcing in the nocturnal boundary layer.
Degree: MS, Atmospheric Science, 2012, Oregon State University
URL: http://hdl.handle.net/1957/30361
► Weak-wind flow in the nocturnal boundary is one of the most poorly understood problems in the field of meteorology. The understanding of weak-wind flows is…
(more)
▼ Weak-wind flow in the nocturnal
boundary is one of the most poorly understood problems in the field of meteorology. The understanding of weak-wind flows is essential for the improvement of regulatory dispersion models which are currently rendered invalid under weak-wind conditions and stable stratification. Recently there have been increased efforts directed towards improving the understanding nocturnal
boundary layer dynamics. The results of these studies have shown that nocturnal
boundary layer flows are often dominated by intermittent turbulence and motions occurring on horizontal scales ranging from hundreds of meters to several kilometers and on time scales of 1 minute to 1 hour. We refer to these scales as sub-meso. This connection has led to the hypothesis that intermittent turbulence generation may be the result of sub-meso motions that are
subject to external forcing originating in the deeper
boundary layer. However, these processes have proven difficult to measure as traditional sensor networks have failed to provide the vertical and horizontal coverage necessary to observe the driving forces on these scales. This study sought to close this knowledge gap using SOund Detection And Ranging (SODAR). SODAR is a ground based acoustic remote sensing technology that is capable of measuring wind and turbulence at multiple heights in the
boundary layer. Data were collected with a pair of SODAR systems with sequentially increasing separation distance at the Oregon State University Botany and Plant Pathology lab during the summer of 2010. The data have indicated that motion occurring on time scales of 2 minutes to 32 minutes are isolated to the lowest 50 meters of the nocturnal
boundary layer. Surface-layer measurements were collected using a pair of sonic anemometers placed at heights of 1.5 and 7 meters above ground level. Comparisons of surface-layer measurements and deeper
boundary layer measurements have shown that when the surface layer stratification is stable, processes within the surface layer are not likely to be influenced by external forcing from aloft. In contrast external forcing from the deeper
boundary layer may still have an influence on weak, nocturnal surface flows when the surface layer is weakly stratified as is shown for the case of low-level jets.
Advisors/Committee Members: Thomas, Christoph K. (advisor), Skyllingstad, Eric (committee member).
Subjects/Keywords: atmosphere; Boundary layer (Meteorology)
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APA ·
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Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Smoot, A. R. (2012). Linking dynamics of the near-surface flow to deeper boundary layer forcing in the nocturnal boundary layer. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/30361
Chicago Manual of Style (16th Edition):
Smoot, Alexander R. “Linking dynamics of the near-surface flow to deeper boundary layer forcing in the nocturnal boundary layer.” 2012. Masters Thesis, Oregon State University. Accessed January 22, 2020.
http://hdl.handle.net/1957/30361.
MLA Handbook (7th Edition):
Smoot, Alexander R. “Linking dynamics of the near-surface flow to deeper boundary layer forcing in the nocturnal boundary layer.” 2012. Web. 22 Jan 2020.
Vancouver:
Smoot AR. Linking dynamics of the near-surface flow to deeper boundary layer forcing in the nocturnal boundary layer. [Internet] [Masters thesis]. Oregon State University; 2012. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/1957/30361.
Council of Science Editors:
Smoot AR. Linking dynamics of the near-surface flow to deeper boundary layer forcing in the nocturnal boundary layer. [Masters Thesis]. Oregon State University; 2012. Available from: http://hdl.handle.net/1957/30361
Baylor University
29.
[No author].
Eigenvalue comparison theorems for certain boundary value problems and positive solutions for a fifth order singular boundary value problem.
Degree: 2016, Baylor University
URL: http://hdl.handle.net/2104/9631
► Comparison of smallest eigenvalues for certain two point boundary value problems for a fifth order linear differential equation are first obtained. The results are extended…
(more)
▼ Comparison of smallest eigenvalues for certain two point
boundary value problems for a fifth order linear differential equation are first obtained. The results are extended to (2n+1)-order and (3n+2)-order
boundary value problems. Methods used for these results involve the theory of u
0-positive operators with respect to a cone in conjunction with sign properties of Green's functions. Finally, initial results are established for the existence of positive solutions for singular two point
boundary value problems for a fifth order nonlinear differential equation. The methods involve application of a fixed point theorem for decreasing operators.
Advisors/Committee Members: Henderson, Johnny (advisor).
Subjects/Keywords: Eigenvalue. Comparison. Boundary Value.
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APA (6th Edition):
author], [. (2016). Eigenvalue comparison theorems for certain boundary value problems and positive solutions for a fifth order singular boundary value problem.
(Thesis). Baylor University. Retrieved from http://hdl.handle.net/2104/9631
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):
author], [No. “Eigenvalue comparison theorems for certain boundary value problems and positive solutions for a fifth order singular boundary value problem.
” 2016. Thesis, Baylor University. Accessed January 22, 2020.
http://hdl.handle.net/2104/9631.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
author], [No. “Eigenvalue comparison theorems for certain boundary value problems and positive solutions for a fifth order singular boundary value problem.
” 2016. Web. 22 Jan 2020.
Vancouver:
author] [. Eigenvalue comparison theorems for certain boundary value problems and positive solutions for a fifth order singular boundary value problem.
[Internet] [Thesis]. Baylor University; 2016. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/2104/9631.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
author] [. Eigenvalue comparison theorems for certain boundary value problems and positive solutions for a fifth order singular boundary value problem.
[Thesis]. Baylor University; 2016. Available from: http://hdl.handle.net/2104/9631
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Johannesburg
30.
Du Plessis, P.
Simulering van aspekte van die atmosferiese grenslaag deur middel van turbulente Couette-stroming.
Degree: 2014, University of Johannesburg
URL: http://hdl.handle.net/10210/10186
► M.Ing.
The goal of the project was to stimulate aspects of the atmospheric boundary layer. As a result of the complexity of the derived models,…
(more)
▼ M.Ing.
The goal of the project was to stimulate aspects of the atmospheric boundary layer. As a result of the complexity of the derived models, it was decided to rather do an experiment on turbulent Couette flow to simulate. some aspects of the atmospheric boundary layer. A Couette flow channel with a maximum wall speed of 1 m/s was built. Experiments were done at two Reynolds numbers, l600 and 2500, corresponding to a channel height of 0.06 m and belt speeds of 0.4 mI and 0.58 m/s, respectively. The Coutte channel has the facility that the supper stationary wall can be heated or cooled. Experiments were carried out with positive and negative temperature gradients for both the Reynolds numbers giving the following results. By heating the top wall a stratified flow results which leads to no mixing of the flow properties. This phenomena is analogous to night time conditions in the atmosphere, when layers at different temperatures form a layered structure with little mixing between layers.
Subjects/Keywords: Boundary layer (Meteorology); Turbulence
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APA (6th Edition):
Du Plessis, P. (2014). Simulering van aspekte van die atmosferiese grenslaag deur middel van turbulente Couette-stroming. (Thesis). University of Johannesburg. Retrieved from http://hdl.handle.net/10210/10186
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):
Du Plessis, P. “Simulering van aspekte van die atmosferiese grenslaag deur middel van turbulente Couette-stroming.” 2014. Thesis, University of Johannesburg. Accessed January 22, 2020.
http://hdl.handle.net/10210/10186.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Du Plessis, P. “Simulering van aspekte van die atmosferiese grenslaag deur middel van turbulente Couette-stroming.” 2014. Web. 22 Jan 2020.
Vancouver:
Du Plessis P. Simulering van aspekte van die atmosferiese grenslaag deur middel van turbulente Couette-stroming. [Internet] [Thesis]. University of Johannesburg; 2014. [cited 2020 Jan 22].
Available from: http://hdl.handle.net/10210/10186.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Du Plessis P. Simulering van aspekte van die atmosferiese grenslaag deur middel van turbulente Couette-stroming. [Thesis]. University of Johannesburg; 2014. Available from: http://hdl.handle.net/10210/10186
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
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Open Access Theses and Dissertations