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University of Texas – Austin
1.
-6863-8962.
Energy transfer and formation processes in cylindrical J-aggregates.
Degree: PhD, Chemistry, 2016, University of Texas – Austin
URL: http://hdl.handle.net/2152/45943 
► Understanding light harvesting systems such as plants and bacteria that use photosynthesis to transport sun light energy to a photosynthetic reaction center is integral to…
(more)
▼ Understanding light harvesting systems such as plants and bacteria that use photosynthesis to transport sun light energy to a photosynthetic reaction center is integral to creating efficient, man-made light harvesting devices. One such system is supramolecular aggregates made from the amphiphillic carbocyanine dye 3,3’-bis- (2-sulfopropyl)-5,5’,6,6’-tetrachloro-1,1’- dioctylbenzimida-carbocyanine (C8S3) which self assembles in aqueous solutions into double- nanotubes comparable to the (antennae) found in the photosynthesizing green sulfur bacteria (GSB). This research uses thin film confocal microscopy and bulk spectroscopy to elucidate the nature of energy transport and formation of groups of C8S3 nanotubes and groups of these nanotubes known as bundles. Confocal microscopy is used to determine energy transport distances of C8S3 nanotubes and bundles in air. The nanotubes were found to have transport distances of ~150 nm whereas the bundles were found to have transport distances of over 500 nm prompting further research into the bundles and their formation. Nanotube solutions with salt added were studied as they evolved into bundles to determine if salt could increase the rate of bundle formation. Linear dichroism, AFM and bulk spectroscopy were used to track the process of nanotubes to bundles and a fitting scheme was created to quantify the rate of bundle formation. The energy transport distance of bundles was further tested by first forming a scheme to disperse the bundles in a polymer matrix without altering their form and then imaging the bundles in the polymer matrix using confocal microscopy. Energy transport distances were calculated to be ~10 nm rather than the longer distances in air. Temperature dependent studies were completed to determine how to effectively retain the structure of the nanotubes and bundles while at temperatures <77K. This information can be used to attempt low temperature confocal microscopy to further understand this complex system.
Advisors/Committee Members: Vanden Bout, David A. (advisor), Webb, Lauren (committee member), Dodabalapur, Ananth (committee member), Roberts, Sean (committee member), Baiz, Carlos (committee member).
Subjects/Keywords: J-aggregate
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APA (6th Edition):
-6863-8962. (2016). Energy transfer and formation processes in cylindrical J-aggregates. (Doctoral Dissertation). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/45943
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Chicago Manual of Style (16th Edition):
-6863-8962. “Energy transfer and formation processes in cylindrical J-aggregates.” 2016. Doctoral Dissertation, University of Texas – Austin. Accessed February 27, 2021.
http://hdl.handle.net/2152/45943.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
MLA Handbook (7th Edition):
-6863-8962. “Energy transfer and formation processes in cylindrical J-aggregates.” 2016. Web. 27 Feb 2021.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Vancouver:
-6863-8962. Energy transfer and formation processes in cylindrical J-aggregates. [Internet] [Doctoral dissertation]. University of Texas – Austin; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2152/45943.
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Council of Science Editors:
-6863-8962. Energy transfer and formation processes in cylindrical J-aggregates. [Doctoral Dissertation]. University of Texas – Austin; 2016. Available from: http://hdl.handle.net/2152/45943
Note: this citation may be lacking information needed for this citation format:
Author name may be incomplete
Texas A&M University
2.
Droddy, Charles Vance.
An Improved Permanent Deformation Model for Unbound Aggregate Base Course.
Degree: MS, Civil Engineering, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155556
► Permanent deformation of unbound base course materials under flexible pavements continue to be a significant source of the rutting observed at the surface. The permanent…
(more)
▼ Permanent deformation of unbound base course materials under flexible pavements continue to be a significant source of the rutting observed at the surface. The permanent deformation behavior of unbound
aggregate bases (UAB) has been documented by several authors. Several models have been proposed to predict the permanent deformation (rutting) occurring in the UAB. Most of the models do not take into account the stress dependent characteristics of UAB or have parameters which vary with stress state.
An improved model has been developed at Texas A&M University which includes the stress dependency in the model and this new approach has been validated. This new model incorporates power functions of the first and second invariants of the stress tensor directly in the model along with the ε0 , ρ , and β from existing single stage models. Several previous models attempted to achieve this by using the stress as a parameter in the fitting coefficients. This left many with relatively low values of R2 or with widely varying coefficients for a range of stress states. By using the stress state directly in the model, a generalized set of fitting parameters for a given material type have been generated. Using these generalized fitting parameters, it is shown that the new model fits the experimental data on a fundamental level.
Advisors/Committee Members: Lytton, Robert L (advisor), Funkhouser, Edward A (committee member), Zollinger, Dan G (committee member).
Subjects/Keywords: Aggregate Base; permanent deformation; rutting
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APA (6th Edition):
Droddy, C. V. (2015). An Improved Permanent Deformation Model for Unbound Aggregate Base Course. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155556
Chicago Manual of Style (16th Edition):
Droddy, Charles Vance. “An Improved Permanent Deformation Model for Unbound Aggregate Base Course.” 2015. Masters Thesis, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/155556.
MLA Handbook (7th Edition):
Droddy, Charles Vance. “An Improved Permanent Deformation Model for Unbound Aggregate Base Course.” 2015. Web. 27 Feb 2021.
Vancouver:
Droddy CV. An Improved Permanent Deformation Model for Unbound Aggregate Base Course. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/155556.
Council of Science Editors:
Droddy CV. An Improved Permanent Deformation Model for Unbound Aggregate Base Course. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155556
University of Newcastle
3.
Cheema, Salman Arif.
The aggregate association index and its extensions.
Degree: PhD, 2016, University of Newcastle
URL: http://hdl.handle.net/1959.13/1312984
► Research Doctorate - Doctor of Philosophy (PhD)
The analysis of aggregate data from 2x2 contingency tables has a long and interesting history. Traditionally, the approach…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
The analysis of aggregate data from 2x2 contingency tables has a long and interesting history. Traditionally, the approach taken to estimate the unknown cell frequencies (or some function of them) is to use ecological inference (EI). However, EI relies on assumptions that are either untestable or are unrealistic. Rather than adopting strategies to estimate the unknown cells, one may instead focus on understanding the underlying association structure between the variables using the <i>Aggregate Association Index</i> (AAI). Given only the aggregate data, the AAI quantifies how likely it is that an association exists between two nominal dichotomous variables when a test of independence is performed at the α level of significance. Such a test therefore relies on Pearson’s chi-squared statistic and does so in terms of the conditional proportion P₁. Here, P₁ is the proportion of individuals/subjects classified into the first column category of the 2x2 table given that they are classified into the first row category. This thesis discusses and expands upon the AAI which was proposed less than a decade ago. The generalisations and variants of the original AAI that we propose highlight the emerging growth of this index in the context of aggregate data analysis and how the AAI overcomes many of the pitfalls that confront the analyst when performing EI. We generalise the AAI to incorporate various linear transformations related to P₁ and demonstrate the invariance of the index to <i>any</i> linear transformation; for example, such transformations include the independence ratio, Pearson contingency, standardised residual and adjusted residual. We also show how the AAI is linked to one of the most common measures of association used to analyse 2x2 contingency tables – the odds ratio. The link between the AAI and odds ratio is investigated further as we establish the theoretical relationship between the index and the extended hypergeometric distribution. In doing so, the analyst may consider any <i>a priori</i> association structure using a new variant of the AAI called the <i>Extended Aggregate Association Index</i> (EAAI). Further extensions of the AAI are also made by generalising the index to incorporate the structure of ordered dichotomous variables. This is achieved by examining the features of ordinal log-linear models and how they may be used to analyse aggregate data. Since the underlying statistic that we shall be using is Pearson’s chi-squared statistic, its magnitude (and therefore the magnitude of the AAI) is strongly influenced by the size of the sample being studied. So, this thesis examines the impact of the sample size on the AAI and proposes strategies to minimise the impact of the sample size on the magnitude of the index. We also introduce the pseudo p-value so that the analyst can evaluate the relative significance of the AAI while isolating the impact of the sample size. Another new measure of association for analysing aggregate data is proposed in this thesis…
Advisors/Committee Members: University of Newcastle. Faculty of Science & Information Technology, School of Mathematical and Physical Sciences.
Subjects/Keywords: aggregate; categorical; data analysis
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APA (6th Edition):
Cheema, S. A. (2016). The aggregate association index and its extensions. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1312984
Chicago Manual of Style (16th Edition):
Cheema, Salman Arif. “The aggregate association index and its extensions.” 2016. Doctoral Dissertation, University of Newcastle. Accessed February 27, 2021.
http://hdl.handle.net/1959.13/1312984.
MLA Handbook (7th Edition):
Cheema, Salman Arif. “The aggregate association index and its extensions.” 2016. Web. 27 Feb 2021.
Vancouver:
Cheema SA. The aggregate association index and its extensions. [Internet] [Doctoral dissertation]. University of Newcastle; 2016. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1959.13/1312984.
Council of Science Editors:
Cheema SA. The aggregate association index and its extensions. [Doctoral Dissertation]. University of Newcastle; 2016. Available from: http://hdl.handle.net/1959.13/1312984
Addis Ababa University
4.
Wubshet, Otoro.
The Determinant of Aggregate Import Demand in Ethiopia: Co Integration Analysis
.
Degree: 2008, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/5223
► In this paper, the determinant of Ethiopia aggregate demand is studies using yearly data in the period 1971/2 to 2006/7. The main objective of the…
(more)
▼ In this paper, the determinant of Ethiopia
aggregate demand is studies using yearly data in the period 1971/2 to 2006/7. The main objective of the paper is to identify the main determinant of Ethiopia import and the relative elasticity of explanatory variables. The augmented dickey fuller and Phillips Peron test is used to test the unit root test. Johansen co integration and error correction model is employed on yearly data in order to approve the existence of long run relationship and to identify the long run and short run relationship. The main finding is that, in the long run Ethiopia import is mainly affected by real effective exchange rate, real gross domestic product and relative price. It shows elastic import demand with respect to explanatory variables except relative price. The sign of real effective exchange rate is unexpected in the long run. The short run adjustment coefficient is identified and has a correct negative sign; however, most of the coefficients of short run variables are statistically insignificant. The implication of the finding is that, ineffectiveness exchange rate policy in the long run, effectiveness of pricing policy and difficulty of substituting imported goods by domestic product.
Advisors/Committee Members: Mnale Kassie (PhD) (advisor).
Subjects/Keywords: Aggregate demand; Relative elasticity
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APA (6th Edition):
Wubshet, O. (2008). The Determinant of Aggregate Import Demand in Ethiopia: Co Integration Analysis
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/5223
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):
Wubshet, Otoro. “The Determinant of Aggregate Import Demand in Ethiopia: Co Integration Analysis
.” 2008. Thesis, Addis Ababa University. Accessed February 27, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/5223.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Wubshet, Otoro. “The Determinant of Aggregate Import Demand in Ethiopia: Co Integration Analysis
.” 2008. Web. 27 Feb 2021.
Vancouver:
Wubshet O. The Determinant of Aggregate Import Demand in Ethiopia: Co Integration Analysis
. [Internet] [Thesis]. Addis Ababa University; 2008. [cited 2021 Feb 27].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/5223.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Wubshet O. The Determinant of Aggregate Import Demand in Ethiopia: Co Integration Analysis
. [Thesis]. Addis Ababa University; 2008. Available from: http://etd.aau.edu.et/dspace/handle/123456789/5223
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
5.
Biruk, Negash.
The Importance of Standardization of Aggregate in Ethiopian Construction Industry
.
Degree: 2014, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/6106
► Concrete is one of the versatile and widely used building materials in the world Construction industry. Fine and coarse aggregates make about 70% by volume…
(more)
▼ Concrete is one of the versatile and widely used building materials in the world
Construction industry. Fine and coarse aggregates make about 70% by volume of
concrete production. It goes without saying that the quality of concrete is thus strongly
influenced by aggregate’s physical and mechanical properties as well as chemical
composition of the parent
aggregate making material. Since most of these materials are
from natural sources in Ethiopian case like from rivers and from natural quarry site, their
quality and composition vary from time to time. Each truck of sand from the same place
at different time may not be the same and it is difficult to design mix proportion for each
truck of sand and this call for a standardization of materials in Ethiopia.
In my research I made concrete C-25, C-30 and C-40 as control mix by standardizing the
aggregate to the Ethiopian standard and other recommendation. By using the property of
this standardized
aggregate mix design was made for control mixes, keeping the mix
proportion constant, aggregates from different sources were used to make concrete of the
same classes as control mix.
Compressive strength test were made at 3
rd
, 7
th
and 28
th
days for control mixes and for
mixes with nonstandard aggregates. Target mean strengths were achieved for control
mix by using Derba Cement 260kg/m
3
, 280kg/m
3
and 380kg/m
3
for C-25, C-30 and C-40
respectively. On the other hand concrete with non standard
aggregate didn’t achieve
target mean strength rather up to 48% reduction in strength was observed.
Advisors/Committee Members: Abebe Dinku, Prof.Dr.-Ing (advisor).
Subjects/Keywords: Standardization of Aggregate;
Construction industry
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APA ·
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Manager
APA (6th Edition):
Biruk, N. (2014). The Importance of Standardization of Aggregate in Ethiopian Construction Industry
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/6106
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):
Biruk, Negash. “The Importance of Standardization of Aggregate in Ethiopian Construction Industry
.” 2014. Thesis, Addis Ababa University. Accessed February 27, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/6106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Biruk, Negash. “The Importance of Standardization of Aggregate in Ethiopian Construction Industry
.” 2014. Web. 27 Feb 2021.
Vancouver:
Biruk N. The Importance of Standardization of Aggregate in Ethiopian Construction Industry
. [Internet] [Thesis]. Addis Ababa University; 2014. [cited 2021 Feb 27].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/6106.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Biruk N. The Importance of Standardization of Aggregate in Ethiopian Construction Industry
. [Thesis]. Addis Ababa University; 2014. Available from: http://etd.aau.edu.et/dspace/handle/123456789/6106
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
6.
Yasmin, Yusuf.
FINE AGGREGATE PRODUCTION AND ITS ENVIRONMENTAL IMPACT IN SOME SELECTED SITES OF THE RIFT VALLEY AREA IN ETHIOPIA
.
Degree: 2014, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/6121
► In today‟s world the use of natural aggregate has increased extensively. We live our lives dependent on an infrastructure created out of concrete. Concrete is…
(more)
▼ In today‟s world the use of natural
aggregate has increased extensively. We live our lives
dependent on an infrastructure created out of concrete. Concrete is a composite material
of which 60-75% by volume is aggregates. Out of this volume, 30-40% is constituted by
fine aggregates. Although potential sources of fine aggregates are widespread and large,
land-use choices, economic considerations, and environmental concerns may limit their
availability. Making
aggregate resources available for our country‟s increasing demand
will be an ongoing challenge. Understanding how fine aggregates are produced and what
environmental impacts they bring about is an important point to investigate. With this in
mind, this research has been undertaken to assess the production process of fine
aggregates in some sites of the Oromia region in Ethiopia and the environmental impacts
concerned with them. It concentrates on both the positive and negative impacts of sand
mining. Positive in terms of financial gain and provision of building material; and
negative in terms of the environmental impact it brings about.
The production of fine
aggregate is not the extraction of the mineral from the source
alone but basically involves a number of steps starting from the exploration, mining,
processing, transporting and finally reclamation. A visit to three different sites was made
along with interviews. From the site visits, it has been found that exploration process has
not been undertaken in all of the sites. In all the three sites the mining process used is the
artisanal technique which does not employ any machineries but mining is carried out by
human labor - making use of hand shovels. In other countries, the sand goes into various
combinations of washers, driers, screens, and classifiers to segregate particle sizes,
crushers to reduce oversized material, and storage and loading facilities. None of this has
been seen in the sites visited. Transportation in all the sites was carried out by making use
of a domestic animal - a donkey to an all-weather road and then transported using a dump
truck. Even though all the three visited sites are currently active, it has been understood from interviews that reclamation is not normally done for sites which have been closed
down.
The research further showed that the environmental impacts associated with sand mining
are impact on the Riparian Habitat, Flora and Fauna, land degradation, loss of aesthetic
value, loss of the stability of the structures, the decrease in water as well as the air
quality, damage to roads, the use of unplanned access roads damaging the farm lands
damaging their crop, diversion of the canal and, siltation in the downstream areas, i.e. the
Awash basin. Moreover, samples from the visited sites were taken and tests were
conducted for silt content and gradation. The results have displayed that none of the
samples have passed for quality requirements set by the standards for silt and gradation.
The production capacity of the workers in all the…
Advisors/Committee Members: Abebe Dinku, Prof. Dr. –Ing (advisor).
Subjects/Keywords: Concrete;
Environment;
Exploration;
Fine aggregate
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APA ·
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Manager
APA (6th Edition):
Yasmin, Y. (2014). FINE AGGREGATE PRODUCTION AND ITS ENVIRONMENTAL IMPACT IN SOME SELECTED SITES OF THE RIFT VALLEY AREA IN ETHIOPIA
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/6121
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):
Yasmin, Yusuf. “FINE AGGREGATE PRODUCTION AND ITS ENVIRONMENTAL IMPACT IN SOME SELECTED SITES OF THE RIFT VALLEY AREA IN ETHIOPIA
.” 2014. Thesis, Addis Ababa University. Accessed February 27, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/6121.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Yasmin, Yusuf. “FINE AGGREGATE PRODUCTION AND ITS ENVIRONMENTAL IMPACT IN SOME SELECTED SITES OF THE RIFT VALLEY AREA IN ETHIOPIA
.” 2014. Web. 27 Feb 2021.
Vancouver:
Yasmin Y. FINE AGGREGATE PRODUCTION AND ITS ENVIRONMENTAL IMPACT IN SOME SELECTED SITES OF THE RIFT VALLEY AREA IN ETHIOPIA
. [Internet] [Thesis]. Addis Ababa University; 2014. [cited 2021 Feb 27].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/6121.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Yasmin Y. FINE AGGREGATE PRODUCTION AND ITS ENVIRONMENTAL IMPACT IN SOME SELECTED SITES OF THE RIFT VALLEY AREA IN ETHIOPIA
. [Thesis]. Addis Ababa University; 2014. Available from: http://etd.aau.edu.et/dspace/handle/123456789/6121
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Victoria University of Wellington
7.
Kent, Dave.
Beyond the Tent - The application of a tool based approach to the exploration of aggregate building methodologies.
Degree: 2019, Victoria University of Wellington
URL: http://hdl.handle.net/10063/8822
► To the detriment of many, the act of building dwellings has become increasingly prohibitive. Materials costs and the cost of labour makes up a significant…
(more)
▼ To the detriment of many, the act of building dwellings has become increasingly prohibitive. Materials costs and the cost of labour makes up a significant part of this expense. While this issue is becoming increasingly paramount in the western world where you have population increase (expected to be doubled by 2050), it is the genuinely vulnerable who are the most affected. This design research thesis explores the logic of
aggregate assemblages as a potentially low cost, low skills base, rapid assembly (not construction) system that could assist in providing a solution to both post-disaster housing demands or refugee encampments where there is plentiful raw base clays or concreteous material.
Aggregate assemblages require neither additives or fixings to bind together instead of relying solely and efficiently on their geometry to create connections. A 2004 internal UNHCR report suggested the average lifespan of a refugee camp was 17 years. Further, while providing little beyond basic shelter, the average lifecycle of a UN family tent is typically three months, hence requiring constant costly replacement. Additionally, political desires for non-permanent settlement solutions along with the potential for fluctuating landscapes induced by severe weather conditions suggest that space for an agile yet cohesive and robust rapid assembly methodology exists. Thus, this thesis proposes that interlocking
aggregate assemblages could provide an alternative solution that would be a valuable addition to the status quo.
The research argues for an interlocking
aggregate creation, and assembly method that goes beyond the tent to offer a durable, robust internal environment with high degrees of flexibility and customisation with its human end users in mind – through the following criteria: allows the occupant to stand up and move freely inside; Accommodates the preparation and cooking of meals under shelter; Can respond to a variety of site conditions: Can adapt to reflect cultural customary notions of space; Can increase the sense of safety and security.
Advisors/Committee Members: Kawiti, Derek.
Subjects/Keywords: Architecture; Aggregate; Tool-based
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Kent, D. (2019). Beyond the Tent - The application of a tool based approach to the exploration of aggregate building methodologies. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8822
Chicago Manual of Style (16th Edition):
Kent, Dave. “Beyond the Tent - The application of a tool based approach to the exploration of aggregate building methodologies.” 2019. Masters Thesis, Victoria University of Wellington. Accessed February 27, 2021.
http://hdl.handle.net/10063/8822.
MLA Handbook (7th Edition):
Kent, Dave. “Beyond the Tent - The application of a tool based approach to the exploration of aggregate building methodologies.” 2019. Web. 27 Feb 2021.
Vancouver:
Kent D. Beyond the Tent - The application of a tool based approach to the exploration of aggregate building methodologies. [Internet] [Masters thesis]. Victoria University of Wellington; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10063/8822.
Council of Science Editors:
Kent D. Beyond the Tent - The application of a tool based approach to the exploration of aggregate building methodologies. [Masters Thesis]. Victoria University of Wellington; 2019. Available from: http://hdl.handle.net/10063/8822
Virginia Tech
8.
Williamson, Gregory Scott.
Investigation of Testing Methods to Determine Long-Term Durability of Wisconsin Aggregate Resources Including Natural Materials, Industrial By-Products, and Recycled/Reclaimed Materials.
Degree: MS, Civil Engineering, 2005, Virginia Tech
URL: http://hdl.handle.net/10919/31822
► The Wisconsin Department of Transportation (WisDOT) uses approximately 11,000,000 tons of aggregate per year for transportation projects. Being able to select durable aggregates for use…
(more)
▼ The Wisconsin Department of Transportation (WisDOT) uses approximately 11,000,000 tons of
aggregate per year for transportation projects. Being able to select durable aggregates for use in transportation projects is of considerable importance, if the
aggregate deteriorates then the constructed facility requires premature repair, rehabilitation or replacement. Realizing the importance and also that deficiencies in the current WisDOT testing protocol may exist, it has been concluded that the durability-testing program for Wisconsin aggregates needs to be updated. For example, WisDOT is currently using the Sodium Sulfate Soundness Test (ASTM C 88) to measure durability, a test that was put in place in 1960. The ability of this test to predict durability performance and simulate field conditions is questionable and it has also been criticized for its lack of precision.
It should also be noted that the use of recycled and reclaimed aggregates has increased in recent years and not all typical durability tests can be used for testing these aggregates. The Sulfate Test in particular cannot be used for testing Recycled Concrete Aggregates (RCA) because the chemical reaction produces erroneous and misleading results.
This project has identified recent advances in the understanding and testing of
aggregate durability. An in depth literature review has been conducted and from the compiled information a laboratory testing program was developed. Selection of the tests was based upon the tests' precision, efficiency, and predictive capabilities. In the laboratory-testing phase of this project the proposed durability tests along with current WisDOT durability tests were used to evaluate the full range of Wisconsin aggregates.
From the test results it was found that the WisDOT
aggregate testing protocol could be reduced substantially by eliminating many of the testing requirements for aggregates that have a vacuum saturated absorption of less than 2%. Also, the addition of several tests was ruled out due to their lack of correlation with field performance records. The Micro-Deval abrasion test is recommended for inclusion in WisDOT testing protocol as a test to measure the abrasion resistance of
aggregate while the L.A. Abrasion test is better suited as a measure of
aggregate strength. Additional conclusions were made based on the durability testing conducted and an overall testing protocol has been developed and is recommended for implementation by WisDOT.
Advisors/Committee Members: Weyers, Richard E. (committeechair), Mokarem, David W. (committee member), Roberts-Wollmann, Carin L. (committee member).
Subjects/Keywords: durability; aggregate; recycled aggregate; reclaimed aggregate; aggregate soundness
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MLA ·
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Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Williamson, G. S. (2005). Investigation of Testing Methods to Determine Long-Term Durability of Wisconsin Aggregate Resources Including Natural Materials, Industrial By-Products, and Recycled/Reclaimed Materials. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/31822
Chicago Manual of Style (16th Edition):
Williamson, Gregory Scott. “Investigation of Testing Methods to Determine Long-Term Durability of Wisconsin Aggregate Resources Including Natural Materials, Industrial By-Products, and Recycled/Reclaimed Materials.” 2005. Masters Thesis, Virginia Tech. Accessed February 27, 2021.
http://hdl.handle.net/10919/31822.
MLA Handbook (7th Edition):
Williamson, Gregory Scott. “Investigation of Testing Methods to Determine Long-Term Durability of Wisconsin Aggregate Resources Including Natural Materials, Industrial By-Products, and Recycled/Reclaimed Materials.” 2005. Web. 27 Feb 2021.
Vancouver:
Williamson GS. Investigation of Testing Methods to Determine Long-Term Durability of Wisconsin Aggregate Resources Including Natural Materials, Industrial By-Products, and Recycled/Reclaimed Materials. [Internet] [Masters thesis]. Virginia Tech; 2005. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10919/31822.
Council of Science Editors:
Williamson GS. Investigation of Testing Methods to Determine Long-Term Durability of Wisconsin Aggregate Resources Including Natural Materials, Industrial By-Products, and Recycled/Reclaimed Materials. [Masters Thesis]. Virginia Tech; 2005. Available from: http://hdl.handle.net/10919/31822
9.
APOSTOLIDI, MARIA.
The macroeconomic nature of aggregate accounting profitability.
Degree: 2014, Athens University Economics and Business (AUEB); Οικονομικό Πανεπιστήμιο Αθηνών
URL: http://hdl.handle.net/10442/hedi/31577
► My thesis contributes to the research field related to the macroeconomic importance of accounting profitability at the aggregate-level. It is developed in three parts. The…
(more)
▼ My thesis contributes to the research field related to the macroeconomic importance of accounting profitability at the aggregate-level. It is developed in three parts. The first part provides a review of the current research pertaining to the understanding of the relation among aggregate accounting numbers, capital markets and macroeconomy. Research on the information content of accounting numbers has been crucial for understanding accounting’s role, impact and power. The examined literature is narrow, but it has recently been expanding, unraveling valuable insights about the information content of aggregate accounting numbers to both capital market and macroeconomy. In the second part, I firstly examine the aggregate accounting profitability’s relation with market returns under the hypothesis of structural instability across diverse monetary policy environments. Secondly, I investigate the monetary linkage between aggregate accounting profitability changes and inflation. The first hypothesis is validated through the finding of a statistically significant relation between market returns and profitability’s interaction with monetary policy settings. My second task is to investigate the impact of aggregate profitability changes on monetary-policy-stance measures in order to explain the relation between aggregate profitability changes and inflation growth. Through the second task, I extend previous literature’s evidence of a strong relation between aggregate earnings changes and the three components of expected stock market returns (i.e., real riskless rate, expected inflation, and expected equity risk premium). In the second section of this thesis’ part, I examine simultaneously the causal relations among aggregate profitability changes, monetary policy changes and inflation growth using vector autoregressive (VAR) models. The empirical results document that the relation between aggregate profitability changes and inflation growth is the result of a positive relation between aggregate profitability and monetary policy changes represented either by effective federal funds rate, federal funds premium, or real federal funds rate. In the third part, I examine whether aggregate accounting profitability changes can predict future cumulative and marginal changes in real output. Using simple univariate and multivariate predictive regressions, I conclude that both the systematic component of aggregate accounting profitability changes and total profitability changes exhibit a leading behavior only for very long (twelve quarter) periods ahead. Nevertheless, for the previous forecasting periods my results indicate that the predictive ability of aggregate profitability derives from the impact of the existing leading indicators. In addition, I examine the predictive ability of aggregate profitability changes in the prediction of turning points. I decompose profitability changes into leading-related and coincident-related components and I find evidence of aggregate accounting profitability changes being mainly a coincident-related…
Subjects/Keywords: Συνολική Κερδοφορία; Aggregate Profitability
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APA ·
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MLA ·
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APA (6th Edition):
APOSTOLIDI, M. (2014). The macroeconomic nature of aggregate accounting profitability. (Thesis). Athens University Economics and Business (AUEB); Οικονομικό Πανεπιστήμιο Αθηνών. Retrieved from http://hdl.handle.net/10442/hedi/31577
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):
APOSTOLIDI, MARIA. “The macroeconomic nature of aggregate accounting profitability.” 2014. Thesis, Athens University Economics and Business (AUEB); Οικονομικό Πανεπιστήμιο Αθηνών. Accessed February 27, 2021.
http://hdl.handle.net/10442/hedi/31577.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
APOSTOLIDI, MARIA. “The macroeconomic nature of aggregate accounting profitability.” 2014. Web. 27 Feb 2021.
Vancouver:
APOSTOLIDI M. The macroeconomic nature of aggregate accounting profitability. [Internet] [Thesis]. Athens University Economics and Business (AUEB); Οικονομικό Πανεπιστήμιο Αθηνών; 2014. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10442/hedi/31577.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
APOSTOLIDI M. The macroeconomic nature of aggregate accounting profitability. [Thesis]. Athens University Economics and Business (AUEB); Οικονομικό Πανεπιστήμιο Αθηνών; 2014. Available from: http://hdl.handle.net/10442/hedi/31577
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
New Jersey Institute of Technology
10.
Islam, Bushra Marium.
RCA: use and future possibilities.
Degree: MSin Civil Engineering - (M.S.), Civil and Environmental Engineering, 2017, New Jersey Institute of Technology
URL: https://digitalcommons.njit.edu/theses/22
► Reuse and recycling of concrete is essential for construction purposes. There has been progressive development in construction projects but at the same time it…
(more)
▼ Reuse and recycling of concrete is essential for construction purposes. There has been progressive development in construction projects but at the same time it has an inverse effect on the environment. Concrete structures are built and demolished continuously all over the world, generating tons of waste materials which are actually reusable in concrete production itself. This paper emphasis on recycled concrete
aggregate (RCA) and many characteristics of RCA. This paper studies RCA’s different properties. RCA’s replacement in the place of natural
aggregate is discussed. The proper amount and researches done on RCA improvement have also been discussed for further in depth study on RCA. RCA is a convenient option for sustainability because demolishing old structures, environmental hazards on different structural etc. are a common phenomenon. They always leave the world with more waste materials that cannot be taken care of naturally. Using these waste materials to create useful structures is one responsible step towards a sustainable world.
Advisors/Committee Members: Matthew P. Adams, Matthew J. Bandelt, Bruno M. Goncalves da Silva.
Subjects/Keywords: Recycled concrete aggregate; Civil Engineering
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Islam, B. M. (2017). RCA: use and future possibilities. (Thesis). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/theses/22
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):
Islam, Bushra Marium. “RCA: use and future possibilities.” 2017. Thesis, New Jersey Institute of Technology. Accessed February 27, 2021.
https://digitalcommons.njit.edu/theses/22.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Islam, Bushra Marium. “RCA: use and future possibilities.” 2017. Web. 27 Feb 2021.
Vancouver:
Islam BM. RCA: use and future possibilities. [Internet] [Thesis]. New Jersey Institute of Technology; 2017. [cited 2021 Feb 27].
Available from: https://digitalcommons.njit.edu/theses/22.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Islam BM. RCA: use and future possibilities. [Thesis]. New Jersey Institute of Technology; 2017. Available from: https://digitalcommons.njit.edu/theses/22
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Minnesota
11.
Albright, Robert.
Developing Aggregate Loss Models For Obscure Insurance Exposures.
Degree: MS, Mathematics, 2020, University of Minnesota
URL: http://hdl.handle.net/11299/217111
► In this paper we will examine how to apply parametric modeling with some simulation techniques to generate potential frequency and severity of claims distributions. The…
(more)
▼ In this paper we will examine how to apply parametric modeling with some simulation techniques to generate potential frequency and severity of claims distributions. The paper outlines the general theory of selecting appropriate statistical distributions for claims data and in maximizing model accuracy or fit. Two specific exposures, critical customer loss and supply chain disruption loss, are used as illustrations. From these distributions, an aggregate loss model is then proposed. The paper will discuss: 1. Possible ways to develop claims data from available market information for obscure insurance risks with application to specific examples. 2. Outline of the theory of parametric estimation. 3. Applying primarily parametric techniques to optimize the ‘fit’ of the estimated distributions for severity and frequency of claims distributions. 4. Development of possible aggregate loss models for the two specific exposures. 5. Proposed areas for further study.
Subjects/Keywords: aggregate; insurance; loss; obscure; parametric
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APA ·
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MLA ·
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Manager
APA (6th Edition):
Albright, R. (2020). Developing Aggregate Loss Models For Obscure Insurance Exposures. (Masters Thesis). University of Minnesota. Retrieved from http://hdl.handle.net/11299/217111
Chicago Manual of Style (16th Edition):
Albright, Robert. “Developing Aggregate Loss Models For Obscure Insurance Exposures.” 2020. Masters Thesis, University of Minnesota. Accessed February 27, 2021.
http://hdl.handle.net/11299/217111.
MLA Handbook (7th Edition):
Albright, Robert. “Developing Aggregate Loss Models For Obscure Insurance Exposures.” 2020. Web. 27 Feb 2021.
Vancouver:
Albright R. Developing Aggregate Loss Models For Obscure Insurance Exposures. [Internet] [Masters thesis]. University of Minnesota; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/11299/217111.
Council of Science Editors:
Albright R. Developing Aggregate Loss Models For Obscure Insurance Exposures. [Masters Thesis]. University of Minnesota; 2020. Available from: http://hdl.handle.net/11299/217111
Texas A&M University
12.
Tanha, Maryam.
Investigation of Soil Hydro-Structural Parameters Under Various Soil Management Practices and Feasibility of Defining a Soil Quality Indicator: A Case Study.
Degree: MS, Water Management and Hydrological Science, 2019, Texas A&M University
URL: http://hdl.handle.net/1969.1/192065
► Hydrostructural parameters are derived from continuously measured thermodynamic relationships which characterize the soil aggregates. The soil aggregate structure is unique and dynamic for each soil…
(more)
▼ Hydrostructural parameters are derived from continuously measured thermodynamic relationships which characterize the soil aggregates. The soil
aggregate structure is unique and dynamic for each soil type and can be affected by the soil’s physical, chemical and biological properties. These parameters represent soil behavior and dynamically represent the changes in the soil
aggregate structure with time. It can be used for developing a good quantitative indicator for the soil health. This study involves a field experiment to examine the changes in pedostructure-based soil characterization under different soil management methods and defining a new soil quality indicator. Three organic treatments (chicken, dairy manure and milorganite) were applied at 0, 168, 336, 672 kgN/ha (rate labeled 1, 2 and 3 respectively) for 36 plots with size 10 ft. × 5 ft. After extracting 12 hydro-structural parameters from TypoSoil measurements, statistical analysis evaluated the sensitivity of these parameters to changes in the soil management across the treatments. Results showed that increasing the rate of application from 1 to 3 didn’t show significant effects on hydrostructural parameters for any treatments. However, regardless of the type of treatment, management application significantly enhanced water content and available water in A horizon. In B horizon, only rate-3 affected available water for Chicken and Dairy manure. In the comparison between three treatments, the dairy manure has more obvious effects and is promising to improve soil
aggregate structure for rates more than rate-1. Also, best application rate for chicken manure seems to be for treatment rate-1, for dairy manure, rate-2 and for milorganite rate3.
There are two reasons that developing a comprehensive soil quality indicator was not possible at this stage of the experiment. First, only sensitive parameters to different management (rate or treatment) were water content parameters but direct
aggregate structure parameters didn’t change across treatments. Therefore, the soil quality indicator model with these parameters would not be all-inclusive. The short duration of the experiment (6 months) can explain the lack of change in the
aggregate structure. However, adding the organic matter helped to increase the potential energy of holding the water and thus increased the water available capacity. Second, there are some other parameters such as crop yield and organic matter which could enhance small changes in
aggregate structure parameters and make interpretations easier. These measurements and analysis are parts of research being conducted by Prairie View University researchers and results have not published yet.
Advisors/Committee Members: Mohtar, Rabi H (advisor), Assi, Amjad (advisor), Schwab, Paul (committee member).
Subjects/Keywords: Pdostructure; Hydrostructure; Aggregate structure
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Tanha, M. (2019). Investigation of Soil Hydro-Structural Parameters Under Various Soil Management Practices and Feasibility of Defining a Soil Quality Indicator: A Case Study. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/192065
Chicago Manual of Style (16th Edition):
Tanha, Maryam. “Investigation of Soil Hydro-Structural Parameters Under Various Soil Management Practices and Feasibility of Defining a Soil Quality Indicator: A Case Study.” 2019. Masters Thesis, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/192065.
MLA Handbook (7th Edition):
Tanha, Maryam. “Investigation of Soil Hydro-Structural Parameters Under Various Soil Management Practices and Feasibility of Defining a Soil Quality Indicator: A Case Study.” 2019. Web. 27 Feb 2021.
Vancouver:
Tanha M. Investigation of Soil Hydro-Structural Parameters Under Various Soil Management Practices and Feasibility of Defining a Soil Quality Indicator: A Case Study. [Internet] [Masters thesis]. Texas A&M University; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/192065.
Council of Science Editors:
Tanha M. Investigation of Soil Hydro-Structural Parameters Under Various Soil Management Practices and Feasibility of Defining a Soil Quality Indicator: A Case Study. [Masters Thesis]. Texas A&M University; 2019. Available from: http://hdl.handle.net/1969.1/192065
Penn State University
13.
Lombardi, Danielle Maria.
Improving Unbound Aggregate Roads through a Comparison of the Performance of Materials.
Degree: 2012, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/16184
► Unbound aggregate roads, or unpaved roads, generally do not hold up to the expectations of the general public. This forces agencies to often pave roads…
(more)
▼ Unbound
aggregate roads, or unpaved roads, generally do not hold up to the expectations of the general public. This forces agencies to often pave roads unnecessarily. Wearing course materials used for unpaved roads and the subgrade they are placed on need to be improved in order to see an improvement in these roads. Research was conducted to prove if there is a benefit to using Driving Surface
Aggregate (DSA), a material developed specifically for use as a wearing course, over another commonly used
aggregate gradation, PennDOT 2A, designed for use as a base course. The performance of DSA and PennDOT 2A under scaled loading with the one-third Model Mobile Load Simulator (MMLS3) was compared in terms of rutting. The materials were evaluated in the laboratory at a lightweight traffic setting (simulating passenger vehicles, pick-up trucks and SUVS) and at a heavy traffic setting (simulating tri-axial and semi-trailers). The MMLS3 was also used in the field on the lightweight traffic setting to evaluate the materials in an as-placed setting. DSA consistently performed better than PennDOT 2A with lower average rut depths, although the predictability of the rut depth formation should be studied in more detail. In considering subgrade weakness, a rehabilitation practice called full-depth reclamation (FDR) has been used to increase roadbed stiffness in paved roads. The impact of using this method for unpaved roads has been evaluated. In situ stiffness testing using the lightweight deflectometer (LWD) and condition assessments of four roads in Erie County, Pennsylvania were compared to evaluate the potential of FDR as a practice to improve the subgrade for unpaved roads. A road consisting of FDR with a tar and chip surface treatment had the highest overall stiffness when compared to a FDR road without a surface treatment, an
aggregate-surfaced road and an unsurfaced road. Both FDR roads showed higher stiffness over the spring-thaw period proving potential benefit to adopting this method as an unpaved road practice; however, future research is needed to evaluate the performance of a FDR road with an
aggregate surface. All four roads showed decreasing condition ratings over the spring-thaw period, but the FDR road with a tar and chip surface treatment required maintenance over the summer months, highlighting one of the major financial downfalls of paving a road.
Advisors/Committee Members: Barry Earl Scheetz, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Unbound Aggregate Roads; Full Depth Reclamation; Driving Surface Aggregate
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Lombardi, D. M. (2012). Improving Unbound Aggregate Roads through a Comparison of the Performance of Materials. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/16184
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):
Lombardi, Danielle Maria. “Improving Unbound Aggregate Roads through a Comparison of the Performance of Materials.” 2012. Thesis, Penn State University. Accessed February 27, 2021.
https://submit-etda.libraries.psu.edu/catalog/16184.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lombardi, Danielle Maria. “Improving Unbound Aggregate Roads through a Comparison of the Performance of Materials.” 2012. Web. 27 Feb 2021.
Vancouver:
Lombardi DM. Improving Unbound Aggregate Roads through a Comparison of the Performance of Materials. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Feb 27].
Available from: https://submit-etda.libraries.psu.edu/catalog/16184.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lombardi DM. Improving Unbound Aggregate Roads through a Comparison of the Performance of Materials. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/16184
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
14.
Denamo, Addissie.
HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
.
Degree: 2008, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/4277
► ABSTRACT Construction materials management is an important element in the management of construction projects. One of the construction materials widely used in construction projects is…
(more)
▼ ABSTRACT
Construction materials management is an important element in the management of
construction projects. One of the construction materials widely used in construction projects is
concrete. Concrete being one of the important constituents of many of the construction
projects, in addition to its subjectivity to variability, requires a close and thorough care and
handling in construction projects. The constituents of concrete, which majority of them occur
naturally, are subjected to a wide range of variability and quality problems. Therefore, with
this respect a research was carried out to assess the situation of handling of concrete making
materials in the Ethiopian construction industry with a special emphasis given to the concrete
making aggregates. The objective of the research was to assess the current situation of the
handling of concrete making materials in the Ethiopian construction industry in general and to
give recommendation inline with the outcome of the results of the research. There fore, in the
research test results of fine
aggregate, coarse
aggregate and rock samples were collected and
analyzed. According to the result, 44%of the coarse
aggregate samples considered and 77% of
the fine
aggregate samples considered couldn’t satisfy requirements set by different standards.
In addition, it has been found out that more than about 60% of the tests that the samples failed
to satisfy don’t attribute to the natural quality of the materials. Further, researches carried out
in different parts of Ethiopia had also shown that the naturally available material have quite
acceptable quality to be used as a concrete making material. The research also indicates that
the reason why concrete making materials fail to comply with requirements attributes to the
handling of the materials in the construction industry but not to the unavailability of materials
satisfying requirements in Ethiopia. Further, from the observations made in construction sites
and
aggregate production plants in addition to the interviews made with relevant personnel, it
was concluded in the research that the
aggregate production in Ethiopia is not up to the
standard with respect to quality, quantity and production process. Another conclusion drawn
from the research was that the
aggregate production process and handling of concrete making
materials in the Ethiopian construction industry should be upgraded in all aspects including
expert training, utilization of improved production process and introduction of
standardization both for the quality of the materials and the production processes. Finally,
from observations made in Germany the study concluded that introduction of a ready-mixed
concrete production system to the Ethiopian construction industry could improve the current
situation with respect to better handling and production of good quality concrete.
Advisors/Committee Members: Abebe Dinku, Dr. –Ing (advisor).
Subjects/Keywords: concrete;
fine aggregate;
coarse aggregate;
cement;
handling;
quality;
production
Record Details
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Share »
Record Details
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Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Denamo, A. (2008). HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/4277
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):
Denamo, Addissie. “HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
.” 2008. Thesis, Addis Ababa University. Accessed February 27, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/4277.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Denamo, Addissie. “HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
.” 2008. Web. 27 Feb 2021.
Vancouver:
Denamo A. HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
. [Internet] [Thesis]. Addis Ababa University; 2008. [cited 2021 Feb 27].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/4277.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Denamo A. HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
. [Thesis]. Addis Ababa University; 2008. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4277
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Addis Ababa University
15.
Denamo, Addissie.
HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
.
Degree: 2008, Addis Ababa University
URL: http://etd.aau.edu.et/dspace/handle/123456789/4288
► ABSTRACT Construction materials management is an important element in the management of construction projects. One of the construction materials widely used in construction projects is…
(more)
▼ ABSTRACT
Construction materials management is an important element in the management of
construction projects. One of the construction materials widely used in construction projects is
concrete. Concrete being one of the important constituents of many of the construction
projects, in addition to its subjectivity to variability, requires a close and thorough care and
handling in construction projects. The constituents of concrete, which majority of them occur
naturally, are subjected to a wide range of variability and quality problems. Therefore, with
this respect a research was carried out to assess the situation of handling of concrete making
materials in the Ethiopian construction industry with a special emphasis given to the concrete
making aggregates. The objective of the research was to assess the current situation of the
handling of concrete making materials in the Ethiopian construction industry in general and to
give recommendation inline with the outcome of the results of the research. There fore, in the
research test results of fine
aggregate, coarse
aggregate and rock samples were collected and
analyzed. According to the result, 44%of the coarse
aggregate samples considered and 77% of
the fine
aggregate samples considered couldn’t satisfy requirements set by different standards.
In addition, it has been found out that more than about 60% of the tests that the samples failed
to satisfy don’t attribute to the natural quality of the materials. Further, researches carried out
in different parts of Ethiopia had also shown that the naturally available material have quite
acceptable quality to be used as a concrete making material. The research also indicates that
the reason why concrete making materials fail to comply with requirements attributes to the
handling of the materials in the construction industry but not to the unavailability of materials
satisfying requirements in Ethiopia. Further, from the observations made in construction sites
and
aggregate production plants in addition to the interviews made with relevant personnel, it
was concluded in the research that the
aggregate production in Ethiopia is not up to the
standard with respect to quality, quantity and production process. Another conclusion drawn
from the research was that the
aggregate production process and handling of concrete making
materials in the Ethiopian construction industry should be upgraded in all aspects including
expert training, utilization of improved production process and introduction of
standardization both for the quality of the materials and the production processes. Finally,
from observations made in Germany the study concluded that introduction of a ready-mixed
concrete production system to the Ethiopian construction industry could improve the current
situation with respect to better handling and production of good quality concrete.
Advisors/Committee Members: Abebe Dinku, Dr. –Ing (advisor).
Subjects/Keywords: concrete;
fine aggregate;
coarse aggregate;
cement;
handling;
quality;
production
Record Details
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Share »
Record Details
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Cite
« Share
❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Denamo, A. (2008). HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
. (Thesis). Addis Ababa University. Retrieved from http://etd.aau.edu.et/dspace/handle/123456789/4288
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):
Denamo, Addissie. “HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
.” 2008. Thesis, Addis Ababa University. Accessed February 27, 2021.
http://etd.aau.edu.et/dspace/handle/123456789/4288.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Denamo, Addissie. “HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
.” 2008. Web. 27 Feb 2021.
Vancouver:
Denamo A. HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
. [Internet] [Thesis]. Addis Ababa University; 2008. [cited 2021 Feb 27].
Available from: http://etd.aau.edu.et/dspace/handle/123456789/4288.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Denamo A. HANDLING OF CONCRETE MAKING MATERIALS IN THE ETHIOPIAN CONSTRUCTION INDUSTRY
. [Thesis]. Addis Ababa University; 2008. Available from: http://etd.aau.edu.et/dspace/handle/123456789/4288
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Newcastle
16.
Tran, Duy Tung.
The aggregate association index and its extension for the analysis of multiple 2x2 contingency tables.
Degree: PhD, 2019, University of Newcastle
URL: http://hdl.handle.net/1959.13/1397754
► Research Doctorate - Doctor of Philosophy (PhD)
Data aggregation often occurs due to data collection methods or confidentiality laws imposed by government and institutional organisations.…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
Data aggregation often occurs due to data collection methods or confidentiality laws imposed by government and institutional organisations. This is largely due to confidentiality issues arising from the imposition of government and corporate protection and data collection methods. The availability of only aggregate data makes it difficult to draw conclusions about the association between categorical variables at the individual level. For data analysts, this issue is of growing concern, especially for those dealing with the aggregate analysis of a single 2x2 table, or stratified, 2x2 tables and lies in the field of ecological inference (EI). Currently, there are a number of EI approaches that are available and provide data analysts with tools to analyse aggregated data. Nonetheless, their results are still questionable due to the variety of assumptions that are made about the individual level data, or the models that are developed to analyse them. As an alternative to ecological inference, one may consider the Aggregate Association Index (AAI) proposed by Beh (2008, 2010). This index gives data analysts an indication of the likely association structure between two categorical variables of a single 2x2 contingency table when the individual level, or joint frequency, data are unknown. To date, the AAI has been developed only for the analysis of a single 2x2 table. Hence, the purpose of this thesis is to extend the application of the AAI to the case where aggregated data from multiple 2x2 tables (i.e. stratified 2x2 tables) require analysis.
Advisors/Committee Members: University of Newcastle. Faculty of Science, School of Mathematical and Physical Sciences.
Subjects/Keywords: aggregate association index; data aggregation; contingency tables; aggregate association index curves
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APA (6th Edition):
Tran, D. T. (2019). The aggregate association index and its extension for the analysis of multiple 2x2 contingency tables. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1397754
Chicago Manual of Style (16th Edition):
Tran, Duy Tung. “The aggregate association index and its extension for the analysis of multiple 2x2 contingency tables.” 2019. Doctoral Dissertation, University of Newcastle. Accessed February 27, 2021.
http://hdl.handle.net/1959.13/1397754.
MLA Handbook (7th Edition):
Tran, Duy Tung. “The aggregate association index and its extension for the analysis of multiple 2x2 contingency tables.” 2019. Web. 27 Feb 2021.
Vancouver:
Tran DT. The aggregate association index and its extension for the analysis of multiple 2x2 contingency tables. [Internet] [Doctoral dissertation]. University of Newcastle; 2019. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1959.13/1397754.
Council of Science Editors:
Tran DT. The aggregate association index and its extension for the analysis of multiple 2x2 contingency tables. [Doctoral Dissertation]. University of Newcastle; 2019. Available from: http://hdl.handle.net/1959.13/1397754
University of Ottawa
17.
Zubaida, Nusrat.
Evaluation of the Potential of Residual Expansion of Concrete Affected by Alkali Aggregate Reaction
.
Degree: 2020, University of Ottawa
URL: http://hdl.handle.net/10393/40581
► One of the biggest challenges nowadays when dealing with critical AAR-affected infrastructure is to determine the induced expansion and damage attained to date in the…
(more)
▼ One of the biggest challenges nowadays when dealing with critical AAR-affected infrastructure is to determine the induced expansion and damage attained to date in the different locations of the structure (i.e. diagnosis), to forecast its potential for further distress over time (i.e. prognosis), as well as its potential structural implications. There are a number of prognosis techniques that have been developed in the past decades which are currently being used worldwide. Yet, most of these approaches use residual expansion procedures based on accelerated laboratory tests performed on cores extracted from damaged structures. However, the majority of the results gathered from these tests have been found to be inaccurate when compared to the swelling behavior of the respective structure in the field and several potential issues have been raised with respect to the test setup and alkali leaching. This work aims to evaluate the efficiency of the various commonly used laboratory setups to assess the residual expansion of AAR-affected concrete. Three different setups (i.e.
38°C and 100% RH; 38°C and soaked in 1M NaOH and; 38°C and wrapped in 0.7M NaOH) and two types of reactive aggregates (fine and coarse) were selected for this research. Expansion is monitored over time and four damage degrees (i.e. 0.05%. 0.12%, 0.20% and 0.30%) are selected for further chemical, microscopic (DRI) and non-destructive tests. Results demonstrated that the 1 M NaOH protocol is much more aggressive than the other two setups. Furthermore, it provides the samples with a unique damage pattern that is different from field affected concrete. Finally, the proposed setup shows to be reliable in providing tested samples with similar deterioration mechanisms than expected. Yet, more efficiency in the reaction kinetics and understanding of the alkalis exchange from the system is still required.
Subjects/Keywords: Alkali aggregate reaction;
Residual expansion;
Reactive aggregate;
Accelerated laboratory test
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APA ·
Chicago ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Zubaida, N. (2020). Evaluation of the Potential of Residual Expansion of Concrete Affected by Alkali Aggregate Reaction
. (Thesis). University of Ottawa. Retrieved from http://hdl.handle.net/10393/40581
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):
Zubaida, Nusrat. “Evaluation of the Potential of Residual Expansion of Concrete Affected by Alkali Aggregate Reaction
.” 2020. Thesis, University of Ottawa. Accessed February 27, 2021.
http://hdl.handle.net/10393/40581.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Zubaida, Nusrat. “Evaluation of the Potential of Residual Expansion of Concrete Affected by Alkali Aggregate Reaction
.” 2020. Web. 27 Feb 2021.
Vancouver:
Zubaida N. Evaluation of the Potential of Residual Expansion of Concrete Affected by Alkali Aggregate Reaction
. [Internet] [Thesis]. University of Ottawa; 2020. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10393/40581.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Zubaida N. Evaluation of the Potential of Residual Expansion of Concrete Affected by Alkali Aggregate Reaction
. [Thesis]. University of Ottawa; 2020. Available from: http://hdl.handle.net/10393/40581
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of South Florida
18.
Alshehri, Saad.
Binding of Nitrite in Concrete, Cement Mortar and Paste.
Degree: 2015, University of South Florida
URL: https://scholarcommons.usf.edu/etd/5899
► Calcium nitrite as a corrosion inhibitor is mainly used to protect steel reinforcement in concrete by reducing its corrosion rate. Hence the effectiveness of calcium…
(more)
▼ Calcium nitrite as a corrosion inhibitor is mainly used to protect steel reinforcement in concrete by reducing its corrosion rate. Hence the effectiveness of calcium nitrite depends on its availability as a free nitrite in the pore solution. The present research work aims to determine the concrete mixture component mostly responsible for nitrite binding in concrete. Firstly, the experimental program included testing of nitrite binding in cement paste. Secondly, the effect of adding the fine aggregate (mortar mix) on nitrite binding was assessed. Finally, the mix with coarse aggregate (concrete mix) was evaluated. In-situ leaching method was used to obtain the pore solution that was needed.
Measurement of pore solution with the In-situ leaching method and after an average of 48 days showed that concrete specimens have the most nitrite binding capacity. Then, the binding of nitrite was less in mortar and paste specimens respectively. Therefore, concrete specimens bind more nitrite compared to the paste and mortar specimens. The binding ratio increased whenever the nitrite addition level increased. Nevertheless, the free nitrite were similar in the case of the lowest nitrite addition for all types of mix. The pH levels for the mixes with nitrite present, were lower than those of the control mixes.
Subjects/Keywords: Free Nitrite; pH; Porosity; Coarse Aggregate; Fine Aggregate; Civil Engineering
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APA (6th Edition):
Alshehri, S. (2015). Binding of Nitrite in Concrete, Cement Mortar and Paste. (Thesis). University of South Florida. Retrieved from https://scholarcommons.usf.edu/etd/5899
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):
Alshehri, Saad. “Binding of Nitrite in Concrete, Cement Mortar and Paste.” 2015. Thesis, University of South Florida. Accessed February 27, 2021.
https://scholarcommons.usf.edu/etd/5899.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Alshehri, Saad. “Binding of Nitrite in Concrete, Cement Mortar and Paste.” 2015. Web. 27 Feb 2021.
Vancouver:
Alshehri S. Binding of Nitrite in Concrete, Cement Mortar and Paste. [Internet] [Thesis]. University of South Florida; 2015. [cited 2021 Feb 27].
Available from: https://scholarcommons.usf.edu/etd/5899.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Alshehri S. Binding of Nitrite in Concrete, Cement Mortar and Paste. [Thesis]. University of South Florida; 2015. Available from: https://scholarcommons.usf.edu/etd/5899
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
19.
Walker, La Sasha.
Sustainable solution to recycled concrete: Improving structural applications.
Degree: PhD, Civil and Environmental Engineering, 2018, Georgia Tech
URL: http://hdl.handle.net/1853/61161
► Construction and demolition (C&D) or debris concrete is an underutilized resource often landfilled or recycled as a non-structural fill material. This study’s main objective is…
(more)
▼ Construction and demolition (C&D) or debris concrete is an underutilized resource often landfilled or recycled as a non-structural fill material. This study’s main objective is to examine the potential to expand reuse options for recycling concrete, specifically for use in structural applications. In 2014, the United States landfilled approximately 375 million tons of concrete, some of which could have been diverted to offset the 1 billion tons of stone
aggregate produced that same year. Thus, expanding productive reuse options for debris concrete can be an important contribution to sustainability. This study will address the knowledge gaps surrounding expanding utilization of recycled concrete in structural concrete by focusing on two main aspects: (1) use of recycled concrete
aggregate as replacement of coarse
aggregate in structural concrete, and (2) use of recycled concrete fines as partial replacement of cement. On the structural scale, locally sourced recycled concrete was used as 100% of the coarse
aggregate in the recycled
aggregate concrete, and the influence of maximum size
aggregate was assessed in shear and flexure. The durability of recycled
aggregate concrete was assessed through measures of permeability, resistance to alkali–silica reaction, and service life modeling of structural elements in chloride-rich environments, all in comparison to companion concrete using natural coarse
aggregate. The potential use of recycled concrete fines, smaller than 74μm, as a supplementary cementitious material or as filler at 20% by replacement of cement was explored. To increase the reactivity of recycled concrete fines, several techniques were used to activate the fines, including calcining and ball milling. The recycled
aggregate concretes produced exhibited comparable strength and durability comparable to natural
aggregate concrete at 100% replacement of coarse
aggregate. Recycled
aggregate concrete in comparison to natural
aggregate concrete at the same maximum size
aggregate had -9% to 3%, -0.5 to 2.5%, -15% to 6.9% difference in compressive strength of 6 ksi at 28 days, flexural strength of 780 psi at 28 days, and shear strength of 800 psi at 28 days, respectively. Both natural
aggregate concrete and recycled
aggregate concrete had high to moderate permeability level. Maximum
aggregate had negotiable effect on the performance of recycled concrete
aggregate. Nevertheless, of the three maximum size aggregates tested in general 0.75-inch best structural performance. Thermogravimetric analysis show that recycled concrete fines do not exhibit pozzolanic reactivity and instead act as filler in cement systems. Activation techniques did enhance the reactivity of recycled concrete fines, as assessed through examination cement hydration kinetics and these improvements were linked to increases in surface area, reductions in impurities, and modified chemical composition. Of the methods explored calcining at 750°C produced the most reactive fines. This work demonstrates that, with proper mix design, recycled concrete can be…
Advisors/Committee Members: Burns, Susan (committee member), Gentry, Russell (committee member), Kahn, Larry (committee member).
Subjects/Keywords: Recycled concrete aggregate; Structural concrete; Recycled aggregate concrete; Sustainability
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APA ·
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MLA ·
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Export
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Manager
APA (6th Edition):
Walker, L. S. (2018). Sustainable solution to recycled concrete: Improving structural applications. (Doctoral Dissertation). Georgia Tech. Retrieved from http://hdl.handle.net/1853/61161
Chicago Manual of Style (16th Edition):
Walker, La Sasha. “Sustainable solution to recycled concrete: Improving structural applications.” 2018. Doctoral Dissertation, Georgia Tech. Accessed February 27, 2021.
http://hdl.handle.net/1853/61161.
MLA Handbook (7th Edition):
Walker, La Sasha. “Sustainable solution to recycled concrete: Improving structural applications.” 2018. Web. 27 Feb 2021.
Vancouver:
Walker LS. Sustainable solution to recycled concrete: Improving structural applications. [Internet] [Doctoral dissertation]. Georgia Tech; 2018. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1853/61161.
Council of Science Editors:
Walker LS. Sustainable solution to recycled concrete: Improving structural applications. [Doctoral Dissertation]. Georgia Tech; 2018. Available from: http://hdl.handle.net/1853/61161
Utah State University
20.
Andrews, Aaron M.
Minimizing Aggregate Movements for Interval Coverage.
Degree: MS, Computer Science, 2014, Utah State University
URL: https://digitalcommons.usu.edu/etd/3893
► We present an efficient algorithm for solving an interval coverage problem. Given n intervals of the same length on a line L and a…
(more)
▼ We present an efficient algorithm for solving an interval coverage problem. Given n intervals of the same length on a line L and a line segment B on L, we want to move the intervals along L such that every point of B is covered by at least one interval and the sum of the moving distances of all intervals is minimized. As a fundamental computational geometry problem, it has applications in mobile sensor barrier coverage in wireless sensor networks. The previous work gave an O(n
2) time algorithm for it. In this thesis, by discovering many interesting observations and developing new algorithmic techniques, we present an O(nlogn) time algorithm for this problem. We also show that Ω(n log n) is the lower bound for the time complexity. Therefore, our algorithm is optimal. Further, our observations and algorithmic techniques may be useful for solving other related problems.
Advisors/Committee Members: Haitao Wang, ;.
Subjects/Keywords: Minimizing Aggregate Movements; Interval Coverage; Aggregate Movements; Computer Sciences
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APA ·
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CSE |
Export
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APA (6th Edition):
Andrews, A. M. (2014). Minimizing Aggregate Movements for Interval Coverage. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/3893
Chicago Manual of Style (16th Edition):
Andrews, Aaron M. “Minimizing Aggregate Movements for Interval Coverage.” 2014. Masters Thesis, Utah State University. Accessed February 27, 2021.
https://digitalcommons.usu.edu/etd/3893.
MLA Handbook (7th Edition):
Andrews, Aaron M. “Minimizing Aggregate Movements for Interval Coverage.” 2014. Web. 27 Feb 2021.
Vancouver:
Andrews AM. Minimizing Aggregate Movements for Interval Coverage. [Internet] [Masters thesis]. Utah State University; 2014. [cited 2021 Feb 27].
Available from: https://digitalcommons.usu.edu/etd/3893.
Council of Science Editors:
Andrews AM. Minimizing Aggregate Movements for Interval Coverage. [Masters Thesis]. Utah State University; 2014. Available from: https://digitalcommons.usu.edu/etd/3893
UCLA
21.
Giuliano, Fernando Mauro.
Essays on the Real Effects of Financial Market Fluctuations.
Degree: Economics, 2015, UCLA
URL: http://www.escholarship.org/uc/item/33p55579
► In the following essays I study the effects of disruptions in financial markets on aggregate outcomes.In the first two chapters, I study the transmission mechanisms…
(more)
▼ In the following essays I study the effects of disruptions in financial markets on aggregate outcomes.In the first two chapters, I study the transmission mechanisms from financial crises to the real economy in emerging countries, in environments where firms set heterogeneous markups. The introduction of heterogeneous markups is backed by data: I document that there is evidence of firms setting heterogeneous markups using microdata for Argentina and Colombia. As an endogenous source of resource misallocation across firms, markups can potentially be an important driver of aggregate productivity and output dynamics during large financial crises. The opening chapter is my first attempt to address the role of heterogeneous markups during financial crises. To investigate the extent to which this has a significant quantitative role, I adapt a model of imperfect competition where markups are a function of within-sector market shares. Using microdata from Argentina's annual manufacturing survey, I document that market shares become more disperse during the Argentine 2001-02 crisis. Through the lens of the model this results in increased variability of markups, which decreases aggregate productivity. I perform an accounting exercise and find that markup-induced misallocation can explain between 6.4% and 15.6% of the fall in aggregate productivity during the Argentine crisis, or up to one third of the overall effect of resource misallocation.In Chapter 2, joint with Gabriel Zaourak, we explicitly introduce financial frictions to analyze the interaction between credit constraints and variable markups during a credit crunch. Financial frictions take the form of a collateral constraint on working capital. A financial crisis in this framework is modeled as an exogenous shock to the maximum amount of working capital that can be financed externally. Using microdata from financial statements and manufacturing surveys, we calibrate the model to match salient features of the Colombian economy for the 1998-99 financial crisis, and evaluate the transition dynamics of aggregate variables. The model replicates the fall and subsequent recovery of aggregate output and productivity, as well as the concentration patterns observed in the data. We find that in this case variable markups partially offset the resource misallocation triggered by a credit crunch, dampening the response of aggregate variables. The reason is that under variable markups firms try not to change their price (hence quantities) as much as they would under constant markups. This is an example of the ambiguous effect of distortions in a second best world. The last chapter is an early empirical exploration of the link between price fluctuations in financial markets and aggregate labor market outcomes, using data from the United Kingdom. I build a quarterly wealth index from stock market prices and real estate prices for the 1971-2012 period. Using a VECM, I find a robust co-integrating relationship between the unemployment rate and the wealth index. Specifically,…
Subjects/Keywords: Economics; Aggregate Productivity; Financial Crises; Macroeconomics; Misallocation
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APA ·
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Export
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Manager
APA (6th Edition):
Giuliano, F. M. (2015). Essays on the Real Effects of Financial Market Fluctuations. (Thesis). UCLA. Retrieved from http://www.escholarship.org/uc/item/33p55579
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):
Giuliano, Fernando Mauro. “Essays on the Real Effects of Financial Market Fluctuations.” 2015. Thesis, UCLA. Accessed February 27, 2021.
http://www.escholarship.org/uc/item/33p55579.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Giuliano, Fernando Mauro. “Essays on the Real Effects of Financial Market Fluctuations.” 2015. Web. 27 Feb 2021.
Vancouver:
Giuliano FM. Essays on the Real Effects of Financial Market Fluctuations. [Internet] [Thesis]. UCLA; 2015. [cited 2021 Feb 27].
Available from: http://www.escholarship.org/uc/item/33p55579.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Giuliano FM. Essays on the Real Effects of Financial Market Fluctuations. [Thesis]. UCLA; 2015. Available from: http://www.escholarship.org/uc/item/33p55579
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of North Texas
22.
Lopez, Carlos Ramiro.
An Exploration of Cooperation during an Asymmetric Iterated Prisoner's Dilemma Game.
Degree: 2020, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc1707264/
► Researchers investigated how the contingent delivery of a cultural consequence on target culturants in an asymmetric iterated prisoner's dilemma game (IPDG) affected players' choices. The…
(more)
▼ Researchers investigated how the contingent delivery of a cultural consequence on target culturants in an asymmetric iterated prisoner's dilemma game (IPDG) affected players' choices. The asymmetric IPDG creates an analogue to income disparities created by wage gaps and other cultural practices that create wealth inequalities between different members of the population and allows researchers to explore how these inequalities affect cooperation between players. Six undergraduate students divided into three dyads participated in an ABABCDCD reversal design. An asymmetric IPDG was arranged in Condition A and C such that one player received a greater number of points regardless of the second participants' selections - analogue to contingencies that produce income inequalities from wage gaps. In Condition B and D, a metacontingency was arranged such that delivery of a cultural consequence (CC; bonus points equally distributed among the dyad) was contingent on the oscillating production of target
aggregate products (AP) across two consecutive cycles. When participants' coordinated responding and contacted the target AP→ CC relation, the wage gap was reduced. However, individual contingencies are in direct competition for the "wealthier" player, reducing the probability of cooperative responding. Results showed the CC selected certain oscillations between target APs resulting in a decrease of a point disparity between the players while also establishing equal points between the players during certain conditions.
Advisors/Committee Members: Cihon, Traci M, Borba, Aecio, Becker, April, Alai, Shahla.
Subjects/Keywords: Metacontingency; wage gap; aggregate products; cultural consequence
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Anna University
23.
Rameshkumar, M.
Properties of lean concrete made with recycled aggregate
and fly ash; -.
Degree: Civil Engineering, 2014, Anna University
URL: http://shodhganga.inflibnet.ac.in/handle/10603/27479
► Quality aggregates have become scarce and costly in many places in newlineIndia due to sudden increase in construction activities required for the newlinedevelopment of new…
(more)
▼ Quality aggregates have become scarce and costly in
many places in newlineIndia due to sudden increase in construction
activities required for the newlinedevelopment of new
infrastructure facilities The use of waste materials in
newlineconstruction appears to be an attractive proposition because
of their low cost newlineenvironmental considerations and depleting
source of quality aggregates if newlinegood performance can be
ensured through appropriate technology One of the newlineproblems
arising from continuous technological and industrial development is
newlinethe disposal of waste materials Various solutions have been
sought out for newlinethis major environmental problem and the best
solution found is recycling As newlineis in the rest of the world
as a result of fast population growth and newlineurbanization the
construction industry is growing at a great pace in our
newlinecountry as wel newline newline
Reference p.161-170
Advisors/Committee Members: Devadas, Manoharan P.
Subjects/Keywords: civil engineering; lean concrete; recycled aggregate
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APA ·
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Export
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Manager
APA (6th Edition):
Rameshkumar, M. (2014). Properties of lean concrete made with recycled aggregate
and fly ash; -. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/27479
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):
Rameshkumar, M. “Properties of lean concrete made with recycled aggregate
and fly ash; -.” 2014. Thesis, Anna University. Accessed February 27, 2021.
http://shodhganga.inflibnet.ac.in/handle/10603/27479.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rameshkumar, M. “Properties of lean concrete made with recycled aggregate
and fly ash; -.” 2014. Web. 27 Feb 2021.
Vancouver:
Rameshkumar M. Properties of lean concrete made with recycled aggregate
and fly ash; -. [Internet] [Thesis]. Anna University; 2014. [cited 2021 Feb 27].
Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27479.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rameshkumar M. Properties of lean concrete made with recycled aggregate
and fly ash; -. [Thesis]. Anna University; 2014. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/27479
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Stellenbosch University
24.
Chandra Paul, Suvash.
Mechanical behaviour and durability performance of concrete containing recycled concrete aggregate.
Degree: MScEng, Civil Engineering, 2011, Stellenbosch University
URL: http://hdl.handle.net/10019.1/17962
► ENGLISH ABSTRACT: A major challenge for our society is the protection of the environment. Some of the important issues are the reduction in the consumption…
(more)
▼ ENGLISH ABSTRACT: A major challenge for our society is the protection of the environment. Some of the important
issues are the reduction in the consumption of energy and natural raw materials, as well as the
increase in consumption of waste materials. At present these topics are getting considerable
attention as part of sustainable development programs. The use of recycled concrete aggregates
(RCA) from construction and demolition waste (C&DW) in construction, as alternative to virgin
(natural) aggregates, has strong potential. The use of RCA preserves natural resources and
reduces the space required for the disposal of RCA in landfill. It is estimated that 16 thousand
million (billion) tons of concrete (and 25 billion tons of
aggregate) were used in 2010. Of the 2-3
billion tons of C&DW which are produced worldwide every year, South Africa contributes 5-8
million tons. This amount is increasing rapidly every year. Significant amounts of demolished
concrete find their way to landfill sites. A solution for excess waste production would be the
utilization of RCA together with an improvement in the final quality of RCA. It might be an
important breakthrough for our society in our attempt towards sustainable development.
Worldwide, infrastructure has developed a great deal since the beginning of the twentieth
century. Much of the core infrastructure, including roads, bridges, water systems, and sewers,
was put in place during the first half of that century. Aggregates used as construction materials,
as for instance in road pavements, or as an ingredient of concrete, are important components of
infrastructure. Urbanization involves reduction of natural
aggregate (NA) resources, but
environmental concern and the rising cost of NA is the reason that recycled materials from
different sources (like roads, buildings) are being used more and more with NA in new
construction work.
Environmental awareness is increasing in every country for many reasons and sustainable
development is demanded of all industries, including the building and construction industries. By
nature, construction is not environmentally friendly, and sometimes it also changes the behavior
of nature in many ways. Recycling is one of the most important ways to minimize the waste that
comes from different sources, thereby avoiding repetition of, and additional environmentally
hazardous practices. It may create new wealth by diminished transport and production costs and
sparing of landfill site space and cost. It has the potential to extend the life of natural resources
by adding a source of material, thereby reducing environmental interference and impacting on
nearby construction sites, all of which improve sustainability of our natural resources.
Much research on the uses of RCA has been performed during the last few decades. In fact, most
of them showed that the strength class of recycled
aggregate concrete (RAC) is adequate for use
as structural concrete although volume changes in and durability performance of RAC in
…
Advisors/Committee Members: Van Zijl, G. P. A. G., Stellenbosch University. Faculty of Engineering. Dept. of Civil Engineering..
Subjects/Keywords: Civil engineering; Natural aggregate concrete; Concrete – Recycling
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APA (6th Edition):
Chandra Paul, S. (2011). Mechanical behaviour and durability performance of concrete containing recycled concrete aggregate. (Masters Thesis). Stellenbosch University. Retrieved from http://hdl.handle.net/10019.1/17962
Chicago Manual of Style (16th Edition):
Chandra Paul, Suvash. “Mechanical behaviour and durability performance of concrete containing recycled concrete aggregate.” 2011. Masters Thesis, Stellenbosch University. Accessed February 27, 2021.
http://hdl.handle.net/10019.1/17962.
MLA Handbook (7th Edition):
Chandra Paul, Suvash. “Mechanical behaviour and durability performance of concrete containing recycled concrete aggregate.” 2011. Web. 27 Feb 2021.
Vancouver:
Chandra Paul S. Mechanical behaviour and durability performance of concrete containing recycled concrete aggregate. [Internet] [Masters thesis]. Stellenbosch University; 2011. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/10019.1/17962.
Council of Science Editors:
Chandra Paul S. Mechanical behaviour and durability performance of concrete containing recycled concrete aggregate. [Masters Thesis]. Stellenbosch University; 2011. Available from: http://hdl.handle.net/10019.1/17962
Texas A&M University
25.
Rezaei, Arash.
Development of a Prediction Model for Skid Resistance of Asphalt Pavements.
Degree: PhD, Civil Engineering, 2012, Texas A&M University
URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8879
► The skid resistance of asphalt pavement is a major characteristic that determines the driving safety on a road, especially under wet surface conditions. Skid resistance…
(more)
▼ The skid resistance of asphalt pavement is a major characteristic that determines the driving safety on a road, especially under wet surface conditions. Skid resistance is primarily a function of the microtexture and macrotexture of a pavement surface. Microtexture is influenced by
aggregate surface characteristics and is required to disrupt the continuity of surface water film and attain frictional resistance between the tire and the pavement surface. Macrotexture is affected mostly by mixture design or
aggregate gradation and contributes to skid resistance by providing drainage paths of water that can be otherwise trapped between a tire and a pavement surface. The increase in macrotexture contributes to preventing hydroplaning and improving wet frictional resistance, particularly at high speeds. While much research has been conducted in the past to identify material factors that affect skid resistance, there is still a need to develop a model for predicting asphalt pavement skid resistance as a function of mixture characteristics and traffic level. The purpose of this study was to develop such a model based on extensive laboratory experiments and field measurements involving different mixture types and
aggregate sources. The model incorporates functions that describe the resistance of aggregates to polishing and
aggregate size distribution. The
aggregate resistance to polishing was quantified by measuring
aggregate texture using the
Aggregate Imaging System (AIMS) before and after polishing in the Micro-Deval device. The analysis in this dissertation demonstrates how this model can be used to design mixtures and classify aggregates that provide desirable skid resistance levels.
Advisors/Committee Members: Masad, Eyad A. (advisor), Little, Dallas N. (committee member), Mathewson, Chris (committee member), Epps Martin, Amy (committee member).
Subjects/Keywords: Pavement; skid resistance; aggregate characteristics; mix gradation
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APA (6th Edition):
Rezaei, A. (2012). Development of a Prediction Model for Skid Resistance of Asphalt Pavements. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8879
Chicago Manual of Style (16th Edition):
Rezaei, Arash. “Development of a Prediction Model for Skid Resistance of Asphalt Pavements.” 2012. Doctoral Dissertation, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8879.
MLA Handbook (7th Edition):
Rezaei, Arash. “Development of a Prediction Model for Skid Resistance of Asphalt Pavements.” 2012. Web. 27 Feb 2021.
Vancouver:
Rezaei A. Development of a Prediction Model for Skid Resistance of Asphalt Pavements. [Internet] [Doctoral dissertation]. Texas A&M University; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8879.
Council of Science Editors:
Rezaei A. Development of a Prediction Model for Skid Resistance of Asphalt Pavements. [Doctoral Dissertation]. Texas A&M University; 2012. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-12-8879
Texas A&M University
26.
Applewhite, James Kenneth.
Aggregate stability, infiltration, and glomalin in eroded and compacted soils on Fort Hood Military Reservation.
Degree: MS, Soil Science, 2008, Texas A&M University
URL: http://hdl.handle.net/1969.1/86062
► Fort Hood Military Reservation is a 900 km2 military installation located between Killeen, Copperas Cove, and Gatesville in central Texas. It supports two full armored…
(more)
▼ Fort Hood Military Reservation is a 900 km2 military installation located between Killeen, Copperas Cove, and Gatesville in central Texas. It supports two full armored divisions which require year-round, live-fire maneuvers and training (Ft. Hood, 2003). As a result of the constant foot traffic and use of heavy equipment, the soils on the training ranges have become increasingly compacted, eroded, and stripped of vegetation. This study evaluated the impact that selected soil amendments would have on soil aggregation, infiltration, and levels of glomalin. A field study was done on plots located inside Fort Hood on a Nuff silty clay (fine-silty, carbonatic, thermic Udic Calciustoll). The plots were amended with composted dairy manure, inorganic fertilizers, and native grass seed.
Aggregate stability was determined using a wet sieving procedure and total glomalin values were quantified using a Bradford assay. Field measurements of infiltration rates were taken using a drip-type rainfall simulator.
Aggregate stability exhibited decreased values over time for all treatments but two (Site Prep / No Seed and Site Prep / Compost / Seed). In addition, three treatments changed significantly over time (from before treatment application to after treatment application). These treatments were the Site Prep / Compost / No Seed, No Prep / No Seed, and No Prep / Seed treatments. Levels of glomalin increased significantly over time for all treatments (p-value <0.001). Glomalin was correlated to
aggregate stability after treatments were applied (p-value <0.01) but not before (p-value 0.89). In addition, infiltration rates were not related to glomalin (p-value 0.9) or
aggregate stability (p-value 0.09). Additional sampling of Fort Hood beyond the plot study demonstrates significant differences in
aggregate stability, infiltration rates, and levels of glomalin. Measurements taken from ten sites showed no correlations between
aggregate stability, infiltration rates, or glomalin. Organic C was correlated to percent water stable aggregates (%WSA) and levels of glomalin. These results illustrate the relationship between organic C and
aggregate stability as well as glomalin levels in maintaining infiltration rates and reducing soil loss by erosion.
Advisors/Committee Members: Hallmark, Charles T. (advisor), Feagley, Sam E. (committee member), Smeins, Fred E. (committee member).
Subjects/Keywords: Aggregate Stability; Glomalin
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APA (6th Edition):
Applewhite, J. K. (2008). Aggregate stability, infiltration, and glomalin in eroded and compacted soils on Fort Hood Military Reservation. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/86062
Chicago Manual of Style (16th Edition):
Applewhite, James Kenneth. “Aggregate stability, infiltration, and glomalin in eroded and compacted soils on Fort Hood Military Reservation.” 2008. Masters Thesis, Texas A&M University. Accessed February 27, 2021.
http://hdl.handle.net/1969.1/86062.
MLA Handbook (7th Edition):
Applewhite, James Kenneth. “Aggregate stability, infiltration, and glomalin in eroded and compacted soils on Fort Hood Military Reservation.” 2008. Web. 27 Feb 2021.
Vancouver:
Applewhite JK. Aggregate stability, infiltration, and glomalin in eroded and compacted soils on Fort Hood Military Reservation. [Internet] [Masters thesis]. Texas A&M University; 2008. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1969.1/86062.
Council of Science Editors:
Applewhite JK. Aggregate stability, infiltration, and glomalin in eroded and compacted soils on Fort Hood Military Reservation. [Masters Thesis]. Texas A&M University; 2008. Available from: http://hdl.handle.net/1969.1/86062
Queens University
27.
Michaud, Katherine.
Evaluation of the Environmental, Material, and Structural Performance of Recycled Aggregate Concrete
.
Degree: Civil Engineering, 2015, Queens University
URL: http://hdl.handle.net/1974/13138
► Concrete is the most commonly used building material in the construction industry, and contributes to 52% of construction and demolition waste in Canada. Recycled concrete…
(more)
▼ Concrete is the most commonly used building material in the construction industry, and contributes to 52% of construction and demolition waste in Canada. Recycled concrete aggregate (RCA) is one way to reduce this impact. To evaluate the performance of coarse and granular (fine and coarse) RCA in structural concrete applications, four studies were performed: an environmental assessment, a material testing program, a shear performance study, and a flexural performance study.
To determine the environmental benefits of recycled aggregate concrete (RAC), three case studies were investigated using different populations and proximities to city centres. Environmental modelling suggested that RCA replacement could result in energy savings and greenhouse gas emission reductions, especially in remote areas.
Tests were performed to determine if the volumetric replacement of up to 30% coarse RCA and 20% granular RCA is suitable for structural concrete applications in Canada. Fresh, hardened, and durability properties were evaluated. All five (5) of the RCA mixes showed equivalent material performance to the control mixes and met the requirements for a structural concrete mix.
The five (5) RAC mixes were also used in structural testing. One-way reinforced concrete slab specimens were tested to failure to evaluate the shear and flexural performance of the RAC members. Peak capacities of and crack formation within each member were analyzed to evaluate the performance of RAC compared to conventional concrete. The shear capacity of specimens made from four (4) of the five (5) RAC mixtures was higher or equivalent to the control specimens. Specimens of the concrete mixture containing the highest content of recycled aggregate, 20% volumetric replacement of granular RCA, had shear capacities 14.1% lower, and exhibited cracking at lower loads than the control. The average flexural capacities of all RAC specimens were within 3.7% of the control specimens.
Results from this research provide evidence that up to 30% coarse recycled concrete aggregate and 10% granular recycled aggregate may be incorporated into structural concrete mixtures without altering the behaviour of the structure. Concrete containing 20% volumetric replacement of the natural aggregate with granular RCA should be designed with special consideration of the shear performance.
Subjects/Keywords: Structural
;
Material
;
Environmental
;
Recycled Concrete Aggregate
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APA (6th Edition):
Michaud, K. (2015). Evaluation of the Environmental, Material, and Structural Performance of Recycled Aggregate Concrete
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/13138
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):
Michaud, Katherine. “Evaluation of the Environmental, Material, and Structural Performance of Recycled Aggregate Concrete
.” 2015. Thesis, Queens University. Accessed February 27, 2021.
http://hdl.handle.net/1974/13138.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Michaud, Katherine. “Evaluation of the Environmental, Material, and Structural Performance of Recycled Aggregate Concrete
.” 2015. Web. 27 Feb 2021.
Vancouver:
Michaud K. Evaluation of the Environmental, Material, and Structural Performance of Recycled Aggregate Concrete
. [Internet] [Thesis]. Queens University; 2015. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1974/13138.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Michaud K. Evaluation of the Environmental, Material, and Structural Performance of Recycled Aggregate Concrete
. [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/13138
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
28.
Cober, Rebecca.
The Role of Aggregate Representations in Scaffolding Collective Inquiry.
Degree: 2012, University of Toronto
URL: http://hdl.handle.net/1807/33640
► This study explores how aggregate representations of student-contributed content were used in whole-class discussions to scaffold scientific inquiry in two middle school science classrooms. Working…
(more)
▼ This study explores how aggregate representations of student-contributed content were used in whole-class discussions to scaffold scientific inquiry in two middle school science classrooms. Working together as a knowledge community, students contribute scaffolded observations concerning HelioRoom and WallCology, room-sized “Embedded Phenomena” simulations, using tablet computers. These observations are collected and represented in aggregate form, and are the focus of teacher-led whole-class discussions. This thesis examines the efficacy of these aggregate designs for advancing students’ and teachers’ engagement in and understanding of the object of scientific inquiry, their usefulness for constructing relational models, and the interaction patterns that arise from their use. Findings suggest that aggregate representations of binary relationships that use tallies are well-suited for learning activities that have directed outcomes, such as constructing a relationship network. Aggregate representations that highlight gaps in data, and areas of agreement and disagreement in the data can be effective tools fostering productive discourse in classrooms.
MAST
Advisors/Committee Members: Slotta, James D., Curriculum, Teaching and Learning.
Subjects/Keywords: Technology; Science; Knowledge Community; Aggregate Representations; 0710
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APA (6th Edition):
Cober, R. (2012). The Role of Aggregate Representations in Scaffolding Collective Inquiry. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/33640
Chicago Manual of Style (16th Edition):
Cober, Rebecca. “The Role of Aggregate Representations in Scaffolding Collective Inquiry.” 2012. Masters Thesis, University of Toronto. Accessed February 27, 2021.
http://hdl.handle.net/1807/33640.
MLA Handbook (7th Edition):
Cober, Rebecca. “The Role of Aggregate Representations in Scaffolding Collective Inquiry.” 2012. Web. 27 Feb 2021.
Vancouver:
Cober R. The Role of Aggregate Representations in Scaffolding Collective Inquiry. [Internet] [Masters thesis]. University of Toronto; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/1807/33640.
Council of Science Editors:
Cober R. The Role of Aggregate Representations in Scaffolding Collective Inquiry. [Masters Thesis]. University of Toronto; 2012. Available from: http://hdl.handle.net/1807/33640
29.
Castro, Filipe Miguel Correia de.
Características Químicas e Físicas de alguns MTA's.
Degree: 2014, Universidade Fernando Pessoa
URL: https://www.rcaap.pt/detail.jsp?id=oai:bdigital.ufp.pt:10284/4372
► Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina Dentária
Introdução: O MTA foi…
(more)
▼ Projeto de Pós-Graduação/Dissertação apresentado à Universidade Fernando Pessoa como parte dos requisitos para obtenção do grau de Mestre em Medicina Dentária
Introdução: O MTA foi preconizado com o intuito de substituir os materiais
obturadores que não reuniam as características ideias para tratamentos dentários, tais
como retro-obturações e reparação de perfurações radiculares.
Objectivo: Pretende-se com este trabalho analisar e sintetizar a evidência científica
existente sobre o MTA disponível no mercado que reúna o máximo de caraterísticas
químicas e físicas para a prática clínica em Medicina Dentária.
Materiais e Métodos: Foi efetuada uma revisão bibliográfica, entre os meses de Maio
e Junho de 2014, nas bases de dados on-line, Pubmed e Scopus, utilizando a VPN da
FMDUP e da UFP. Recorreu-se também ao repositório da biblioteca da Faculdade de
Ciências da Saúde da UFP. As palavras-chave utilizadas foram "Mineral Trioxide
Aggregate", "Chemical Properties" e "Physical Properties", correlacionadas com o
operador booleano "AND", nos idiomas inglês, português e espanhol. Desta pesquisa
selecionaram-se 24 artigos que vieram a constituir o corpus documental para esta
revisão.
Resultados: Os resultados foram centrados entre algumas caraterísticas Químicas e
Físicas dos MTA's analisados, nomeadamente Constituição Química, pH, Libertação
de Iões Cálcio, Tempo de Presa, Força de Compressão, Solubilidade e Radiopacidade.
Estes valores obtidos foram variando de cimento em cimento e de acordo com a
metodologia adoptada para a sua obtenção.
Conclusão: A Composição Química do MTA e sua relação é extremamente
importante para nós, Médicos Dentistas, com o intuito de perceber o seu
comportamento no ato clínico a executar e ao longo do tempo. Os valores mais
elevados de pH são do MTA Angelus® e White ProRoot® e o de menor valor é do
MTAB®. O que que apresenta maior libertação de iões cálcio é o MTA BIO® e o que
apresenta menor valor é o MTAB®. Concluímos que o MTA BIO® apresenta o menor
tempo de presa e o Fillapex® o maior tempo. O MTA que exibe maior resistência às
forças compressivas é o MTA ProRoot Grey® e o de menor capacidade é o MTA !
! II
Fillapex®. O que apresenta maior Solubilidade é o MTA Fillapex® e o que apresenta
menor valor é o MTA ProRoot Grey®. verificamos que o MTA Fillapex® é o MTA
mais radiopaco e o ProRoot Grey® o MTA que apresenta valor de radiopacidade
inferior. Introduction: The MTA has been recommended in order to replace the filling
materials that do not meet the characteristics for dental treatments, such as retrofillings
and repair of root perforations.
Objective: The aim of this research was review and synthesize the existing scientific
evidence on the MTA available on the market that meets the maximum chemical and
physical characteristics for clinical practice in dentistry.
Materials and Methods: A literature review was performed, between the months of
May and June 2014, in online databases, such as Pubmed and Scopus, using the
FMDUP and UFP’s VPN. This was also…
Advisors/Committee Members: Matos, Miguel Albuquerque.
Subjects/Keywords: Mineral Trioxide Aggregate; Chemical Properties; Physical Properties
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APA (6th Edition):
Castro, F. M. C. d. (2014). Características Químicas e Físicas de alguns MTA's. (Thesis). Universidade Fernando Pessoa. Retrieved from https://www.rcaap.pt/detail.jsp?id=oai:bdigital.ufp.pt:10284/4372
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):
Castro, Filipe Miguel Correia de. “Características Químicas e Físicas de alguns MTA's.” 2014. Thesis, Universidade Fernando Pessoa. Accessed February 27, 2021.
https://www.rcaap.pt/detail.jsp?id=oai:bdigital.ufp.pt:10284/4372.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Castro, Filipe Miguel Correia de. “Características Químicas e Físicas de alguns MTA's.” 2014. Web. 27 Feb 2021.
Vancouver:
Castro FMCd. Características Químicas e Físicas de alguns MTA's. [Internet] [Thesis]. Universidade Fernando Pessoa; 2014. [cited 2021 Feb 27].
Available from: https://www.rcaap.pt/detail.jsp?id=oai:bdigital.ufp.pt:10284/4372.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Castro FMCd. Características Químicas e Físicas de alguns MTA's. [Thesis]. Universidade Fernando Pessoa; 2014. Available from: https://www.rcaap.pt/detail.jsp?id=oai:bdigital.ufp.pt:10284/4372
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Washington State University
30.
[No author].
DESIGN AND CHARACTERIZATION OF ASPHALT MIXTURES BASED ON PARTICLE PACKING AND MECHANICAL MODELING
.
Degree: 2012, Washington State University
URL: http://hdl.handle.net/2376/4296
► Existing asphalt mixture design approaches are mainly empirical based "trial-and-error" methods. Based purely on volumetrics, such design methods have little consideration of the mechanical performance…
(more)
▼ Existing asphalt mixture design approaches are mainly empirical based "trial-and-error" methods. Based purely on volumetrics, such design methods have little consideration of the mechanical performance of the mixtures. With the trend of moving the pavement research into more mechanistic based methods and targeting the ultimate goal to good field performance, it is necessary to develop a sophisticated mix design and characterization methodology which can help the designer understand the expected engineering performance of the mix at the early stages, at the same time, to have a more efficient tool to evaluate the quality of the mixtures. This research develops a comprehensive
aggregate gradation and asphalt mixture design method that estimates the mechanical properties of the mix at early stage. In this method, strong correlations between
aggregate properties, volumetrics, and mechanical properties are identified, making the VMA (Voids in Mineral
Aggregate) an excellent media to link the properties of aggregates and asphalt binder to their engineering performance. The concept of the design procedure, especially the
aggregate gradation design procedure, is largely based on an analysis of
aggregate packing and interlocking. As a fast and convenient design method that emphasizes more on the mechanical performance of the mix, the new design method can be used to evaluate the quality of an existing gradation and mix design, and adjust the gradation of a new mix to satisfy both volumetrics and mechanical properties. In addition, the characteristics of asphalt mixture are studied using micromechanical based discrete element method (DEM) and macromechanical modeling. In DEM simulation, an image based ball clumping technique is used for simulating the angularity properties of
aggregate particles. The DEM model is established and calibrated to describe the viscoelastic (dynamic modulus and phase angle) and viscoelastic plastic (strength) properties of asphalt mixtures with or without damage involved. As for macromechanical modeling, a constitutive model for characterizing the permanent deformation of asphalt mixture is explored by taking consideration of the directional distribution of aggregates (anisotropy), and the damage induced by plasticity.
Advisors/Committee Members: Shen, Shihui (advisor).
Subjects/Keywords: Civil engineering;
Aggregate Packing;
Asphalt Mixture;
DEM
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APA (6th Edition):
author], [. (2012). DESIGN AND CHARACTERIZATION OF ASPHALT MIXTURES BASED ON PARTICLE PACKING AND MECHANICAL MODELING
. (Thesis). Washington State University. Retrieved from http://hdl.handle.net/2376/4296
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. “DESIGN AND CHARACTERIZATION OF ASPHALT MIXTURES BASED ON PARTICLE PACKING AND MECHANICAL MODELING
.” 2012. Thesis, Washington State University. Accessed February 27, 2021.
http://hdl.handle.net/2376/4296.
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. “DESIGN AND CHARACTERIZATION OF ASPHALT MIXTURES BASED ON PARTICLE PACKING AND MECHANICAL MODELING
.” 2012. Web. 27 Feb 2021.
Vancouver:
author] [. DESIGN AND CHARACTERIZATION OF ASPHALT MIXTURES BASED ON PARTICLE PACKING AND MECHANICAL MODELING
. [Internet] [Thesis]. Washington State University; 2012. [cited 2021 Feb 27].
Available from: http://hdl.handle.net/2376/4296.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
author] [. DESIGN AND CHARACTERIZATION OF ASPHALT MIXTURES BASED ON PARTICLE PACKING AND MECHANICAL MODELING
. [Thesis]. Washington State University; 2012. Available from: http://hdl.handle.net/2376/4296
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
◁ [1] [2] [3] [4] [5] … [31] ▶
. 
Open Access Theses and Dissertations
