You searched for subject:(Heterogeneity).
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1.
Sasaki, Yuya.
Essays in Econometrics of Heterogeneous Agents.
Degree: PhD, Economics, 2012, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:297618/ 
► Economic models often involve non-separability between observed and unobserved heterogeneous characteristics of economic agents. This dissertation presents methods of identification, estimation, and inference of nonparametric…
(more)
▼ Economic models often involve non-separability between
observed and unobserved
heterogeneous characteristics of economic agents. This
dissertation presents methods
of identification, estimation, and inference of nonparametric
and nonseparable economic
models for cross section and panel data. The first chapter
discusses identification
and estimation of nonseparable dynamic panel data with
non-random dynamic
selection. It shows that nonseparable dynamic panel models
with endogenous attrition
can be identified from six time periods of unbalanced panel
data. The principle
of constrained maximum likelihood is proposed for consistent
estimation. The second
chapter discusses identification of average structural
partial effects for endogenous
nonseparable cross-section models without assuming
monotonicity. Nonparametric
identification methods are proposed for various first-stage
structural and reducedform
assumptions. The third chapter discusses statistical methods
of model tests
for endogenous nonseparable cross-section models when
instruments exhibit discrete
variations and the outcome structure is not monotone with
respect to unobserved
heterogeneity. It shows that the testing
method possesses sufficient power even if
instruments are discrete and exert only local effects on
endogenous choice.
Advisors/Committee Members: Kleibergen, Frank (Director), Renault, Eric (Reader), Schennach, Susanne (Reader).
Subjects/Keywords: heterogeneity
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APA (6th Edition):
Sasaki, Y. (2012). Essays in Econometrics of Heterogeneous Agents. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:297618/
Chicago Manual of Style (16th Edition):
Sasaki, Yuya. “Essays in Econometrics of Heterogeneous Agents.” 2012. Doctoral Dissertation, Brown University. Accessed March 02, 2021.
https://repository.library.brown.edu/studio/item/bdr:297618/.
MLA Handbook (7th Edition):
Sasaki, Yuya. “Essays in Econometrics of Heterogeneous Agents.” 2012. Web. 02 Mar 2021.
Vancouver:
Sasaki Y. Essays in Econometrics of Heterogeneous Agents. [Internet] [Doctoral dissertation]. Brown University; 2012. [cited 2021 Mar 02].
Available from: https://repository.library.brown.edu/studio/item/bdr:297618/.
Council of Science Editors:
Sasaki Y. Essays in Econometrics of Heterogeneous Agents. [Doctoral Dissertation]. Brown University; 2012. Available from: https://repository.library.brown.edu/studio/item/bdr:297618/
University of Leicester
2.
Sharkey, Annabel J.
Interrogating inter- and intratumour genomic heterogeneity in mesothelioma.
Degree: PhD, 2020, University of Leicester
URL: https://doi.org/10.25392/leicester.data.12697562.v1
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811477
► Background: Despite recent advances, treatment options for patients with malignant pleural mesothelioma (MPM) are limited and prognosis remains poor. The aims of this work were…
(more)
▼ Background: Despite recent advances, treatment options for patients with malignant pleural mesothelioma (MPM) are limited and prognosis remains poor. The aims of this work were to better understand the somatic copy number alteration (SCNA) landscape of MPM and to identify potential therapeutic targets, to determine genetic factors predicting outcome following radical surgery, and to develop an evolutionary study of MPM. Methods: The Affymetrix Oncoscan array was used to evaluate SCNAs from 94 tumour samples. Common SCNAs were evaluated as potential therapeutic targets, including PRMT5 as a synthetic lethal target for MTAP in vitro. SCNA profiles of patients with extremes of outcome following radical surgery were compared to determine any genetic predictors of outcome. A second set of tumours was analysed in an attempt to validate these findings. A pilot of the Medusa study (NCT03654833) was carried out to evaluate the genomic spatial heterogeneity within 6 MPM tumours by whole exome sequencing. Results: Deletion of 9p21.3 was the most prevalent SCNA. MTAP was shown to have potentially synthetic lethal interaction with PRMT5 in vitro. Deletion of CDKN2A was a truncal event in 67% of cases. BAP1 and NF2 were commonly heterozygously deleted, with mutation of the remaining allele a truncal event on phylogenetic analysis. A group of 47 SCNAs were exclusive to patients with a short time to progression, and having one or more of these predicted outcome. Conclusions Several potential therapeutic targets have been identified. The presence of one or more specific SCNAs could give a measure of prognosis for patients from routinely obtained tumour tissue samples.
Subjects/Keywords: genomic heterogeneity; mesothelioma; Intertumour heterogeneity; intratumour heterogeneity
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APA (6th Edition):
Sharkey, A. J. (2020). Interrogating inter- and intratumour genomic heterogeneity in mesothelioma. (Doctoral Dissertation). University of Leicester. Retrieved from https://doi.org/10.25392/leicester.data.12697562.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811477
Chicago Manual of Style (16th Edition):
Sharkey, Annabel J. “Interrogating inter- and intratumour genomic heterogeneity in mesothelioma.” 2020. Doctoral Dissertation, University of Leicester. Accessed March 02, 2021.
https://doi.org/10.25392/leicester.data.12697562.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811477.
MLA Handbook (7th Edition):
Sharkey, Annabel J. “Interrogating inter- and intratumour genomic heterogeneity in mesothelioma.” 2020. Web. 02 Mar 2021.
Vancouver:
Sharkey AJ. Interrogating inter- and intratumour genomic heterogeneity in mesothelioma. [Internet] [Doctoral dissertation]. University of Leicester; 2020. [cited 2021 Mar 02].
Available from: https://doi.org/10.25392/leicester.data.12697562.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811477.
Council of Science Editors:
Sharkey AJ. Interrogating inter- and intratumour genomic heterogeneity in mesothelioma. [Doctoral Dissertation]. University of Leicester; 2020. Available from: https://doi.org/10.25392/leicester.data.12697562.v1 ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.811477
University of Manchester
3.
Harkin, Lauren.
Heterogeneity of Cell Fate Inducers.
Degree: 2013, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:189821
► Pattern formation of multicellular organisms in the absence of positional signals is thought to occur due to scattered cells within a population having different response…
(more)
▼ Pattern formation of multicellular organisms in the
absence of positional signals is thought to occur due to scattered
cells within a population having different response thresholds to
uniform signalling molecules. The cell populations are genetically
uniform but heterogeneities arise from differential gene expression
that are expected to bias cells towards particular fates. This
differential gene expression can affect cellular processes such as
growth, cell cycle regulation and metabolism. The single celled
amoebae Dictyostelium discoideum are thought to exhibit non-genetic
heterogeneity within a population of clonal vegetative cells which
later contributes to their fates in development. Upon starvation,
Dictyostelium amoebae aggregate together to form the multicellular
slug and culminant structures before becoming a fruiting body. The
fruiting body consists of self-sacrificing stalk cells and viable
spore cells. By altering the growth history of the cells and using
RNA sequencing analysis, I aim to find heterogeneities that exist
within these clonal cell populations. These differences in the gene
expression profiles of cells are expected to contribute to the fate
decisions made by cells at later stages of
development.
Advisors/Committee Members: MILLARD, THOMAS T, Thompson, Christopher, Millard, Thomas.
Subjects/Keywords: heterogeneity; gefe
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APA (6th Edition):
Harkin, L. (2013). Heterogeneity of Cell Fate Inducers. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:189821
Chicago Manual of Style (16th Edition):
Harkin, Lauren. “Heterogeneity of Cell Fate Inducers.” 2013. Doctoral Dissertation, University of Manchester. Accessed March 02, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:189821.
MLA Handbook (7th Edition):
Harkin, Lauren. “Heterogeneity of Cell Fate Inducers.” 2013. Web. 02 Mar 2021.
Vancouver:
Harkin L. Heterogeneity of Cell Fate Inducers. [Internet] [Doctoral dissertation]. University of Manchester; 2013. [cited 2021 Mar 02].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:189821.
Council of Science Editors:
Harkin L. Heterogeneity of Cell Fate Inducers. [Doctoral Dissertation]. University of Manchester; 2013. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:189821
Université de Neuchâtel
4.
Mariéthoz, Grégoire.
Geological stochastic imaging for aquifer
characterization.
Degree: 2009, Université de Neuchâtel
URL: http://doc.rero.ch/record/12607
► Accurately modeling connectivity of geological structures is critical for flow and transport problems. Using multiple-points simulations is one of the most advanced tools to produce…
(more)
▼ Accurately modeling connectivity of geological
structures is critical for flow and transport problems. Using
multiple-points simulations is one of the most advanced tools to
produce realistic reservoir structures. It proceeds by considering
data events (spatial arrangements of values) derived from a
training image (TI). The usual method consists in storing all the
data events of the TI in a database, which is used to compute
conditional probabilities for the simulation. Instead, the Direct
Sampling method (DS) proposed in this thesis consists in sampling
directly the TI for a given data event. As soon as the data event
in the TI matches the data event at the node to simulate, the value
at its central node is directly pasted in the simulation. Because
it accommodates data events of varying geometry, multi-grids are
not needed. The method can deal with categorical and continuous
variables and can be extended to multivariate cases. Therefore, it
can handle new classes of problems. Different adaptations of the DS
are proposed. The first one is aimed at reconstructing partially
informed images or datasets. Instead of inferring data events from
a TI, a training dataset is used. If the density of measurements is
high enough, significant non-parametric spatial statistics can be
derived from the data, and the patterns found in those data are
mimicked without model inference. Therefore, minimum assumptions
are made on the spatial structure of the reconstructed fields.
Moreover, very limited parameterization is needed. The method gives
good results for the reconstruction of complex 3D geometries from
relatively small datasets. Another adaptation of the DS algorithm
is aimed at performing super-resolution of coarse images. DS is
used to stochastically simulate the structures at scales smaller
than the measurement resolution. These structures are inferred
using a hypothesis of scale-invariance on the spatial patterns
found at the coarse scale. The approach is illustrated with
examples of satellite imaging and digital photography.
Parallelization is another important topic treated in this thesis.
The size of simulation grids used for numerical models has
increased by many orders of magnitude in the past years. Efficient
pixel-based geostatistical simulation algorithms exist, but for
very large grids and complex spatial models, computational burden
remains heavy. As cluster computers become widely available, using
parallel strategies is a natural step for increasing the usable
grid size and the complexity of the models. These strategies must
take profit of the possibilities offered by machines with a large
number of processors. On such machines, the bottleneck is often the
communication time between processors. This thesis presents a
strategy distributing grid nodes among all available processors
while minimizing communication and latency times. It consists in
centralizing the simulation on a master processor that calls other
slave processors as if they were functions simulating one node
every time. The key is to decouple the…
Advisors/Committee Members: Philippe (Dir.).
Subjects/Keywords: heterogeneity
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APA (6th Edition):
Mariéthoz, G. (2009). Geological stochastic imaging for aquifer
characterization. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/12607
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):
Mariéthoz, Grégoire. “Geological stochastic imaging for aquifer
characterization.” 2009. Thesis, Université de Neuchâtel. Accessed March 02, 2021.
http://doc.rero.ch/record/12607.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Mariéthoz, Grégoire. “Geological stochastic imaging for aquifer
characterization.” 2009. Web. 02 Mar 2021.
Vancouver:
Mariéthoz G. Geological stochastic imaging for aquifer
characterization. [Internet] [Thesis]. Université de Neuchâtel; 2009. [cited 2021 Mar 02].
Available from: http://doc.rero.ch/record/12607.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Mariéthoz G. Geological stochastic imaging for aquifer
characterization. [Thesis]. Université de Neuchâtel; 2009. Available from: http://doc.rero.ch/record/12607
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Universiteit Utrecht
5.
Mooijman, D.
Translation specificity and ribosomal heterogeneity.
Degree: 2012, Universiteit Utrecht
URL: http://dspace.library.uu.nl:8080/handle/1874/240777
► Control of gene expression is essential for cellular processes to proceed correctly as disturbances in both RNA and protein lev- els have shown to be…
(more)
▼ Control of gene expression is essential for cellular processes to proceed correctly as disturbances in both RNA and protein lev-
els have shown to be causative for a multitude of diseases and developmental defects (Orkin et al 1982, Kishino et al 1997). For
instance the process of development is highly regulated and is especially sensitive to disturbances in gene expression. Many de-
velopmental defects are the direct result of the misregulation of one or more gene products during a specific time point during
development (Chisaka and Capecchi 1991). Most of the attention on gene regulation is focused on transcription, in part because
a lot is known about transcription by the use of expression-array and RNA sequencing technology. Recently, methods have be-
come available that suggest that ribosomes are more than constitutive translation machines. This, in combination with the fact
that regulation of the translation from RNA to protein has shown to be of vital importance during development (Ganapathi and
Shimamra 2008) shows that a focus on translational events can be of great interest. This master thesis will focus on the methods
to assess translation, the mechanisms of translational regulation in different organisms during development and the selectivity of
the process and I will end with my view on current interesting perspectives in the field of translational regulation and ribosome
specificity.
Advisors/Committee Members: Ketting, Prof. Dr. R, Oudenaarden, Prof. Dr. A van.
Subjects/Keywords: Translation; heterogeneity; development
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APA ·
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APA (6th Edition):
Mooijman, D. (2012). Translation specificity and ribosomal heterogeneity. (Masters Thesis). Universiteit Utrecht. Retrieved from http://dspace.library.uu.nl:8080/handle/1874/240777
Chicago Manual of Style (16th Edition):
Mooijman, D. “Translation specificity and ribosomal heterogeneity.” 2012. Masters Thesis, Universiteit Utrecht. Accessed March 02, 2021.
http://dspace.library.uu.nl:8080/handle/1874/240777.
MLA Handbook (7th Edition):
Mooijman, D. “Translation specificity and ribosomal heterogeneity.” 2012. Web. 02 Mar 2021.
Vancouver:
Mooijman D. Translation specificity and ribosomal heterogeneity. [Internet] [Masters thesis]. Universiteit Utrecht; 2012. [cited 2021 Mar 02].
Available from: http://dspace.library.uu.nl:8080/handle/1874/240777.
Council of Science Editors:
Mooijman D. Translation specificity and ribosomal heterogeneity. [Masters Thesis]. Universiteit Utrecht; 2012. Available from: http://dspace.library.uu.nl:8080/handle/1874/240777
Carnegie Mellon University
6.
Lai, Han.
Phylogenetic Reconciliation with Transfers.
Degree: 2017, Carnegie Mellon University
URL: http://repository.cmu.edu/dissertations/1019
► Correctly inferring the events in the history of a gene family is crucial to relating gene evolution to ecological adaptation, understanding the evolution of gene…
(more)
▼ Correctly inferring the events in the history of a gene family is crucial to relating gene evolution to ecological adaptation, understanding the evolution of gene function, and inferring homology relationships. Information about the evolution of a gene family can be obtained from the incongruence between a gene tree and the associated species tree. Phylogenetic reconciliation algorithms infer gene events through a formal comparison of the gene and species trees. In this thesis, I expand the reconciliation framework to capture more complex evolutionary scenarios. Current reconciliation algorithms are capable of inferring duplication, transfer, and loss events when both the gene tree and the species tree are well resolved. They are not, however, well equipped to infer events with non-binary trees. A non-binary species tree indicates that evolutionary forces are also in play on the population level. A nonbinary gene tree reflects uncertainty in the gene tree branching order, due to insufficient information from the sequence data. Reconciliation algorithms that do not account for these processes can result in incorrect inference of events. To address these problems, I first introduce an algorithm that reconciles a binary gene tree with a non-binary species tree while accounting for gene tree incongruence that could result from population processes rather than gene events. Second, I present an exact algorithm and several fast heuristics that use reconciliation to resolve uncertainty in a non-binary gene tree. In a parsimony optimization framework, reconciliation seeks the solution that minimizes the weighted sum of the inferred events. One major challenge of this approach is how to select event weights that will infer the correct event history. First, I tackle this challenge from a probabilistic perspective by considering how the underlying gene event rates influence the best choice of event weights. Second, I use a topological approach to identify common tradeoffs between histories with transfers and histories with duplications and losses. By making these tradeoffs explicit, my approach provides a framework for applying biological intuition to the problem of weight selection. This significantly improves the researcher's understanding of how different weights will affect the reconciliation result, leading to better estimation of gene events. I have implemented the algorithms described above in Notung, a publically available and widely used reconciliation software package. Using this software, I demonstrate the applicability of my theoretical work to concrete biological problems via a phylogenomic analysis in Cyanobacteria. The results reveal a link between gain and loss of photosynthesis genes and niche adaptation.
Subjects/Keywords: phylogenetics; reconciliation; heterogeneity
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APA (6th Edition):
Lai, H. (2017). Phylogenetic Reconciliation with Transfers. (Thesis). Carnegie Mellon University. Retrieved from http://repository.cmu.edu/dissertations/1019
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):
Lai, Han. “Phylogenetic Reconciliation with Transfers.” 2017. Thesis, Carnegie Mellon University. Accessed March 02, 2021.
http://repository.cmu.edu/dissertations/1019.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Lai, Han. “Phylogenetic Reconciliation with Transfers.” 2017. Web. 02 Mar 2021.
Vancouver:
Lai H. Phylogenetic Reconciliation with Transfers. [Internet] [Thesis]. Carnegie Mellon University; 2017. [cited 2021 Mar 02].
Available from: http://repository.cmu.edu/dissertations/1019.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Lai H. Phylogenetic Reconciliation with Transfers. [Thesis]. Carnegie Mellon University; 2017. Available from: http://repository.cmu.edu/dissertations/1019
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Utah
7.
Solheim, Perry Warren.
Heterogenity of fiscal year-end choice: exploring influences and effects by examining fiscal year-end changes.
Degree: PhD, Accounting;, 2010, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1958/rec/575
► In my dissertation I explore motivations and effects of the accounting choice of fiscal year-end (FYE). I demonstrate that the choice is neither static nor…
(more)
▼ In my dissertation I explore motivations and effects of the accounting choice of fiscal year-end (FYE). I demonstrate that the choice is neither static nor uniform. A nontrivial number of firms initially choose an FYE that differs from that of the majority of their industry. The majority and nonmajority firms differ along the dimensions of performance, strategy, administrative costs and information environment. I further explore whether these differences are evident in firms that changed their FYE. I find some evidence that firms may select an initial FYE or subsequently change their FYE in an effort to influence their subindustry group membership. I find evidence that firms may make their FYE choice to take advantage of potential savings in administrative costs. I find evidence that the choice may be influenced by information environment factors.
Subjects/Keywords: Fiscal-year; Heterogeneity
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APA (6th Edition):
Solheim, P. W. (2010). Heterogenity of fiscal year-end choice: exploring influences and effects by examining fiscal year-end changes. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1958/rec/575
Chicago Manual of Style (16th Edition):
Solheim, Perry Warren. “Heterogenity of fiscal year-end choice: exploring influences and effects by examining fiscal year-end changes.” 2010. Doctoral Dissertation, University of Utah. Accessed March 02, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1958/rec/575.
MLA Handbook (7th Edition):
Solheim, Perry Warren. “Heterogenity of fiscal year-end choice: exploring influences and effects by examining fiscal year-end changes.” 2010. Web. 02 Mar 2021.
Vancouver:
Solheim PW. Heterogenity of fiscal year-end choice: exploring influences and effects by examining fiscal year-end changes. [Internet] [Doctoral dissertation]. University of Utah; 2010. [cited 2021 Mar 02].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1958/rec/575.
Council of Science Editors:
Solheim PW. Heterogenity of fiscal year-end choice: exploring influences and effects by examining fiscal year-end changes. [Doctoral Dissertation]. University of Utah; 2010. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd2/id/1958/rec/575
Vanderbilt University
8.
Bailey, Roger Allen.
Essays on the Interaction of Product Characteristics, Consumer Heterogeneity, and Information.
Degree: PhD, Economics, 2013, Vanderbilt University
URL: http://hdl.handle.net/1803/13963
► This dissertation addresses three related questions. The second chapter models a monopolist with private information about her product, over which consumers have heterogeneous preferences. Consumers…
(more)
▼ This dissertation addresses three related questions. The second chapter models a monopolist with private information about her product, over which consumers have heterogeneous preferences. Consumers may incur an audit cost to acquire this information before purchase, and the monopolist may signal this information via price. Equilibrium analysis yields two surviving
equilibria: a separating equilibrium with price signaling and a pooling equilibrium with consumer audit. Welfare analysis reveals that either equilibrium may be preferable, depending on the value of the model's parameters. The third chapter assess whether or not a proxy variable for individual consumers' concern for their health is valuable in the estimation of demand for products in which a brand's ``healthiness' may be of concern to consumers. A random-coefficients logit model is applied to scanner data across 28 U.S. cities, together with demographic data from the Current Population Survey (CPS) and the Behavioral Risk Factor Surveillance System (BRFSS), to estimate the coefficients of the interaction between health-related product characteristics and a proxy variable for health conscientiousness in the estimation of demand for ready-to-eat cereal. The results suggest that the interaction of tobacco use, as a proxy for a consumer health conscientiousness, may
be a worthwhile addition to the commonly collected demographic information used in the estimation of demand. The final chapter addresses the problem of estimating the multiple sets of preferences that underlie the purchasing behavior of a household, and doing so in such a way as to retrieve actionable household-level information about preferences. A hierarchical Bayesian finite mixture model is proposed as a solution, wherein the individual purchases of each
household are the result of one of finitely many underlying distributions for preferences. Results applying the model to simulated household panel datasets demonstrate the ability of the model to converge to the true underlying parameters of such data.
Advisors/Committee Members: Jeff Dotson (committee member), Tong Li (committee member), Jennifer Reinganum (Committee Chair), Andrew Daughety (Committee Chair).
Subjects/Keywords: consumer information; heterogeneity
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APA (6th Edition):
Bailey, R. A. (2013). Essays on the Interaction of Product Characteristics, Consumer Heterogeneity, and Information. (Doctoral Dissertation). Vanderbilt University. Retrieved from http://hdl.handle.net/1803/13963
Chicago Manual of Style (16th Edition):
Bailey, Roger Allen. “Essays on the Interaction of Product Characteristics, Consumer Heterogeneity, and Information.” 2013. Doctoral Dissertation, Vanderbilt University. Accessed March 02, 2021.
http://hdl.handle.net/1803/13963.
MLA Handbook (7th Edition):
Bailey, Roger Allen. “Essays on the Interaction of Product Characteristics, Consumer Heterogeneity, and Information.” 2013. Web. 02 Mar 2021.
Vancouver:
Bailey RA. Essays on the Interaction of Product Characteristics, Consumer Heterogeneity, and Information. [Internet] [Doctoral dissertation]. Vanderbilt University; 2013. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1803/13963.
Council of Science Editors:
Bailey RA. Essays on the Interaction of Product Characteristics, Consumer Heterogeneity, and Information. [Doctoral Dissertation]. Vanderbilt University; 2013. Available from: http://hdl.handle.net/1803/13963
Queens University
9.
Chernoff, Alexander.
Essays on Firm Heterogeneity with Empirical Applications in Economic History and Agricultural Economics
.
Degree: Economics, 2016, Queens University
URL: http://hdl.handle.net/1974/14446
► This thesis uses models of firm-heterogeneity to complete empirical analyses in economic history and agricultural economics. In Chapter 2, a theoretical model of firm heterogeneity…
(more)
▼ This thesis uses models of firm-heterogeneity to complete empirical analyses in economic history and agricultural economics. In Chapter 2, a theoretical model of firm heterogeneity is used to derive a statistic that summarizes the welfare gains from the introduction of a new technology. The empirical application considers the use of mechanical steam power in the Canadian manufacturing sector during the late nineteenth century. I exploit exogenous variation in geography to estimate several parameters of the model. My results indicate that the use of steam power resulted in a 15.1 percent increase in firm-level productivity and a 3.0-5.2 percent increase in aggregate welfare. Chapter 3 considers various policy alternatives to price ceiling legislation in the market for production quotas in the dairy farming sector in Quebec. I develop a dynamic model of the demand for quotas with farmers that are heterogeneous in their marginal cost of milk production. The econometric analysis uses farm-level data and estimates a parameter of the theoretical model that is required for the counterfactual experiments. The results indicate that the price of quotas could be reduced to the ceiling price through a 4.16 percent expansion of the aggregate supply of quotas, or through moderate trade liberalization of Canadian dairy products. In Chapter 4, I study the relationship between farm-level productivity and participation in the Commercial Export Milk (CEM) program. I use a difference-in-difference research design with inverse propensity weights to test for causality between participation in the CEM program and total factor productivity (TFP). I find a positive correlation between participation in the CEM program and TFP, however I find no statistically significant evidence that the CEM program affected TFP.
Subjects/Keywords: Firm Heterogeneity; Productivity
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APA (6th Edition):
Chernoff, A. (2016). Essays on Firm Heterogeneity with Empirical Applications in Economic History and Agricultural Economics
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/14446
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):
Chernoff, Alexander. “Essays on Firm Heterogeneity with Empirical Applications in Economic History and Agricultural Economics
.” 2016. Thesis, Queens University. Accessed March 02, 2021.
http://hdl.handle.net/1974/14446.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Chernoff, Alexander. “Essays on Firm Heterogeneity with Empirical Applications in Economic History and Agricultural Economics
.” 2016. Web. 02 Mar 2021.
Vancouver:
Chernoff A. Essays on Firm Heterogeneity with Empirical Applications in Economic History and Agricultural Economics
. [Internet] [Thesis]. Queens University; 2016. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1974/14446.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Chernoff A. Essays on Firm Heterogeneity with Empirical Applications in Economic History and Agricultural Economics
. [Thesis]. Queens University; 2016. Available from: http://hdl.handle.net/1974/14446
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Boston College
10.
Dmitriev, Mikhail.
Essays in International Macroeconomics.
Degree: PhD, Economics, 2014, Boston College
URL: http://dlib.bc.edu/islandora/object/bc-ir:103536
► My dissertation develops a set of tools for thinking about heterogeneity in economic models in an analytically tractable way. Many models use the representative agent…
(more)
▼ My dissertation develops a set of tools for thinking
about
heterogeneity in economic models in an analytically tractable
way. Many models use the representative agent framework, which
greatly simplifies macroeconomic aggregation but abstracts from the
heterogeneity we see in the real world. Models with
heterogeneity
in general equilibrium have too many moving parts, so that it is
hard to disentangle cause and effect. First, my work in
international macroeconomics incorporates
heterogeneity via
idiosyncratic shocks across countries in a simple and analytical
way. Second, my work on financial frictions helps to understand the
role of asymmetric information between lenders and borrowers in
different contractual environments. Crucially, these insights can
be incorporated into the models currently used by academics and
central banks for policy analysis.
Advisors/Committee Members: Fabio Ghironi (Thesis advisor), Susanto Basu (Thesis advisor).
Subjects/Keywords: Heterogeneity; Economic models
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Dmitriev, M. (2014). Essays in International Macroeconomics. (Doctoral Dissertation). Boston College. Retrieved from http://dlib.bc.edu/islandora/object/bc-ir:103536
Chicago Manual of Style (16th Edition):
Dmitriev, Mikhail. “Essays in International Macroeconomics.” 2014. Doctoral Dissertation, Boston College. Accessed March 02, 2021.
http://dlib.bc.edu/islandora/object/bc-ir:103536.
MLA Handbook (7th Edition):
Dmitriev, Mikhail. “Essays in International Macroeconomics.” 2014. Web. 02 Mar 2021.
Vancouver:
Dmitriev M. Essays in International Macroeconomics. [Internet] [Doctoral dissertation]. Boston College; 2014. [cited 2021 Mar 02].
Available from: http://dlib.bc.edu/islandora/object/bc-ir:103536.
Council of Science Editors:
Dmitriev M. Essays in International Macroeconomics. [Doctoral Dissertation]. Boston College; 2014. Available from: http://dlib.bc.edu/islandora/object/bc-ir:103536
University of Melbourne
11.
Anaka, Matthew.
Origins of heterogeneity in melanoma.
Degree: 2012, University of Melbourne
URL: http://hdl.handle.net/11343/37488
► The cancer stem cell hypothesis has dominated discussions of cancer cellheterogeneity in recent years; however its relevance to melanoma is controversial. This thesis presents projects…
(more)
▼ The cancer stem cell hypothesis has dominated discussions of cancer cellheterogeneity in recent years; however its relevance to melanoma is controversial. This thesis presents projects outlining sources of cellular heterogeneity in melanoma in relation to three models of cancer development: the cancer stem cell model, clonal evolution, and phenotypic plasticity. A common cancer stem cell culture method, which involves supplementing serum-free media with specific growth factors, yielded a model of melanoma that was not as representative of the original tumour as standard methods. Gene expression profiling revealed a biased towards expression of neural lineage genes, which could seriously confound therapeutic target selection. In contrast metastatic melanoma cell lines and a metastatic melanoma tissue sample were found to be heterogeneous for DNA copy number abnormalities, supporting the involvement of clonal evolution in the development of melanoma heterogeneity. Finally by segregating melanoma cells based on functional heterogeneity evidence for dynamic and reversible transitions between different phenotypes was observed. Gene expression profiling of these functionally distinct subpopulations identified genes relating to epithelial-to-mesenchymal transition and inflammation as relevant to melanoma cell invasion and drug resistance, including both cytotoxic and targeted therapies. Together these results suggest that heterogeneity between the cells of a melanoma results from ongoing genetic changes as well as cell-cell and environmental interactions, and that targeting molecules representing multiple phenotypes simultaneously might be necessary to successfully treat the disease.
Subjects/Keywords: melanoma; cancer; heterogeneity
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Anaka, M. (2012). Origins of heterogeneity in melanoma. (Doctoral Dissertation). University of Melbourne. Retrieved from http://hdl.handle.net/11343/37488
Chicago Manual of Style (16th Edition):
Anaka, Matthew. “Origins of heterogeneity in melanoma.” 2012. Doctoral Dissertation, University of Melbourne. Accessed March 02, 2021.
http://hdl.handle.net/11343/37488.
MLA Handbook (7th Edition):
Anaka, Matthew. “Origins of heterogeneity in melanoma.” 2012. Web. 02 Mar 2021.
Vancouver:
Anaka M. Origins of heterogeneity in melanoma. [Internet] [Doctoral dissertation]. University of Melbourne; 2012. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/11343/37488.
Council of Science Editors:
Anaka M. Origins of heterogeneity in melanoma. [Doctoral Dissertation]. University of Melbourne; 2012. Available from: http://hdl.handle.net/11343/37488
University of Pretoria
12.
[No author].
Determinants and consequences of elephant spatial use
in Southern Africa’s arid savannas
.
Degree: 2008, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-08122008-141848/
► Resources that can optimize survival are distributed unevenly across landscapes. I assumed that the distribution of these resources is reflected by landscape heterogeneity and that…
(more)
▼ Resources that can optimize survival are distributed
unevenly across landscapes. I assumed that the distribution of
these resources is reflected by landscape
heterogeneity and that
selection for areas with relatively high
heterogeneity reflects on
selection for resources. I therefore hypothesized that landscape
heterogeneity determines variability in elephant home range
location and size. I evaluated home range sizes for elephants
living in the Etosha National Park (n = 6), Khaudum Game Reserve (n
= 6) and Ngamiland District 11 (n = 4) during two wet and two dry
seasons. I used raster grid landscape maps, which were based on
structural classes, to superimpose elephant home ranges and to
generate randomly located ranges. I then used the FRAGSTATS
programme to calculate five landscape metrics that measure aspects
of
heterogeneity within elephant and randomly located ranges. I
compared landscape
heterogeneity of the three study areas using the
landscape metrics calculated for the randomly located ranges.
Assuming that higher values of Patch density, Lanscape shape index
and Shannon diversity index, and lower values of Largest patch
index and Contagion implies selection for
heterogeneity, I
qualitatively compared the distribution and the mean of the
landscape metric values for the elephant home ranges with those for
the randomly located ranges. The influence of season on selection
for the landscape metrics was also evaluated. I searched for
relationships between home range size and landscape metrics for the
three study areas and searched for a possible relationship between
home range size and water point density for elephants in Etosha and
Khaudum. Khaudum was consistently more heterogeneous than Etosha
and NG11, while the latter was the least heterogeneous. Within
these study areas, at least some of the landscape metrics may
explain the location of elephant home ranges. The consistent
apparent selection for areas with relatively higher values of
Landscape shape index and Shannon diversity index and lower values
of Largest patch index and Contagion across both wet and/or dry
seasons by elephants in Etosha and NG11 suggests that landscape
heterogeneity can explain landscape selection by elephants. This
did not hold for elephants in Khaudum where elephants
inconsistently selected for Largest patch index and Landscape shape
index. This study further suggested that landscape
heterogeneity
did not determine home range size. However, water was a strong
determinant of home range size and may therefore explain the lack
of selection for
heterogeneity in Khaudum.
Heterogeneity is an
inherent characteristic of landscapes and seems to reflect on the
availability of resources that may subsequently influence the way
elephants use space. My study supported the concept that increasing
space, while promoting
heterogeneity for elephants may enhance
range expansion. The management of elephants should therefore be
directed at optimising the availability of heterogeneous landscapes
when setting land aside for their conservation. Management…
Advisors/Committee Members: Prof R J van Aarde (advisor).
Subjects/Keywords: Khaudum;
Landscape heterogeneity;
Etosha;
UCTD
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
author], [. (2008). Determinants and consequences of elephant spatial use
in Southern Africa’s arid savannas
. (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-08122008-141848/
Chicago Manual of Style (16th Edition):
author], [No. “Determinants and consequences of elephant spatial use
in Southern Africa’s arid savannas
.” 2008. Masters Thesis, University of Pretoria. Accessed March 02, 2021.
http://upetd.up.ac.za/thesis/available/etd-08122008-141848/.
MLA Handbook (7th Edition):
author], [No. “Determinants and consequences of elephant spatial use
in Southern Africa’s arid savannas
.” 2008. Web. 02 Mar 2021.
Vancouver:
author] [. Determinants and consequences of elephant spatial use
in Southern Africa’s arid savannas
. [Internet] [Masters thesis]. University of Pretoria; 2008. [cited 2021 Mar 02].
Available from: http://upetd.up.ac.za/thesis/available/etd-08122008-141848/.
Council of Science Editors:
author] [. Determinants and consequences of elephant spatial use
in Southern Africa’s arid savannas
. [Masters Thesis]. University of Pretoria; 2008. Available from: http://upetd.up.ac.za/thesis/available/etd-08122008-141848/
Universidade do Rio Grande do Sul
13.
Silva, Daniel Nogueira.
Desemprego e heterogeneidade da força de trabalho no Brasil (1990-2013).
Degree: 2015, Universidade do Rio Grande do Sul
URL: http://hdl.handle.net/10183/133000
► O desemprego é um dos principais problemas enfrentados pelas economias capitalistas. Analisando a sua incidência sobre a força de trabalho, há evidências que alguns grupos…
(more)
▼ O desemprego é um dos principais problemas enfrentados pelas economias capitalistas. Analisando a sua incidência sobre a força de trabalho, há evidências que alguns grupos de trabalhadores - como as mulheres, os jovens, os negros - sofrem sistematicamente com taxas de desemprego mais elevadas. Neste contexto, o objetivo desta dissertação é analisar a relação entre o desemprego e a heterogeneidade dos trabalhadores e como ela se apresentou no Brasil no período entre 1990 a 2013. A principal hipótese deste trabalho é de que as diferenças existentes entre os trabalhadores - como gênero, raça, idade, entre outras - também podem ser responsáveis, em interação com outros determinantes macroeconômicos, por níveis e dinâmicas diferenciadas de desemprego. A metodologia dessa pesquisa consiste em uma revisão bibliográfica de quatro abordagens macroeconômicas do desemprego e o modo como elas tratam a heterogeneidade da força de trabalho, além do uso de métodos quantitativos com base em dados sobre a economia brasileira. Com base na revisão bibliográfica e nos dados da economia brasileira, é utilizado um modelo econométrico de vetores de correção de erros (VECM) para verificar algumas hipóteses do desemprego e a sua relação com a heterogeneidade. Os resultados do trabalho indicam que, apesar das dificuldades nas teorias do desemprego em inserir a heterogeneidade dos trabalhadores em seus arcabouços teóricos, as visões marxista e pós-keynesiana oferecem importantes instrumentos teóricos e metodológicos para esse tipo de problema. Além disso, os resultados econométricos confirmam, parcialmente, que a demanda efetiva, seguindo a hipótese pós-keynesiana, e o conflito distributivo entre lucros e salários, argumento marxista, são fatores importantes para compreender o desemprego no Brasil. No que diz respeito à relação entre a heterogeneidade e o desemprego, os resultados apontam que um choque na taxa de desemprego incide de forma diferenciada entre os grupos que compõem a força de trabalho. Contudo, nem sempre o desemprego atinge de forma mais intensa os grupos que apresentam historicamente as maiores taxas de desocupação.
Unemployment is one of the main problems faced by capitalist economies. By analyzing its impact on the workforce, the research shows that there are evidences that some groups of workers – such as women, young people, blacks - systematically suffer from higher unemployment rates. In this context, the objective of this work is to analyze the relationship between unemployment and the heterogeneity of workers and how this relationship appears in Brazil from 1990 to 2013. The main hypothesis of this work is that the differences between the workers - such as gender, race, age, among others - may also be responsible, in interaction with other macroeconomic determinants, for the level and the dynamic of the different unemployment rates. The methodology of this research consists of a literature review of four macroeconomic approaches of the unemployment and how they treat the heterogeneity of the workforce, and also the…
Advisors/Committee Members: Milan, Marcelo.
Subjects/Keywords: Unemployment; Economia; Heterogeneity; Workforce; Econometrics
Record Details
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Silva, D. N. (2015). Desemprego e heterogeneidade da força de trabalho no Brasil (1990-2013). (Thesis). Universidade do Rio Grande do Sul. Retrieved from http://hdl.handle.net/10183/133000
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Silva, Daniel Nogueira. “Desemprego e heterogeneidade da força de trabalho no Brasil (1990-2013).” 2015. Thesis, Universidade do Rio Grande do Sul. Accessed March 02, 2021.
http://hdl.handle.net/10183/133000.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Silva, Daniel Nogueira. “Desemprego e heterogeneidade da força de trabalho no Brasil (1990-2013).” 2015. Web. 02 Mar 2021.
Vancouver:
Silva DN. Desemprego e heterogeneidade da força de trabalho no Brasil (1990-2013). [Internet] [Thesis]. Universidade do Rio Grande do Sul; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10183/133000.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Silva DN. Desemprego e heterogeneidade da força de trabalho no Brasil (1990-2013). [Thesis]. Universidade do Rio Grande do Sul; 2015. Available from: http://hdl.handle.net/10183/133000
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Alberta
14.
Maruta, Admasu A.
Heterogeneity in Attitudes Underlying Preferences for
Genomic Technology Producing Hybrid Poplars on Public Land.
Degree: MS, Department of Resource Economics and Environmental
Sociology, 2016, University of Alberta
URL: https://era.library.ualberta.ca/files/c6682x413m
► This study investigates the public preference heterogeneity of planting genetically improved poplar tree on public land for biofuel production in Western Canada. Using a sample…
(more)
▼ This study investigates the public preference
heterogeneity of planting genetically improved poplar tree on
public land for biofuel production in Western Canada. Using a
sample of the public from British Columbia, Alberta, Saskatchewan,
and Manitoba, respondents were asked to vote in a series of
hypothetical referenda comparing the new proposed forest policies
to the current policy (base scenario). Proposed policies varied
based on poplar breeding method (traditional, genomics, or genetic
modification) and whether poplars may be used for biofuel
production. A respondents’ segmentation framework with cluster
analysis and probit model was applied to data of respondents to
uncover the heterogeneity of public’s perception. The results of
this study reveal that positive and negative perceptions about
planting genetically improved poplar tree in the region create a
division of respondents of somewhat supporters, somewhat opponents,
opponents and supporters. British Colombians and Manitobans are
identified as somewhat supporters and opponents of, respectively,
the new policy of planting genetically improved poplar trees on
public land. On the other hand, Saskatchewanians and Albertans are
identified as supporters and somewhat opponents of, respectively,
the new policy.
Subjects/Keywords: Preference; Heterogeneity; Cluster Analysis
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Maruta, A. A. (2016). Heterogeneity in Attitudes Underlying Preferences for
Genomic Technology Producing Hybrid Poplars on Public Land. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/c6682x413m
Chicago Manual of Style (16th Edition):
Maruta, Admasu A. “Heterogeneity in Attitudes Underlying Preferences for
Genomic Technology Producing Hybrid Poplars on Public Land.” 2016. Masters Thesis, University of Alberta. Accessed March 02, 2021.
https://era.library.ualberta.ca/files/c6682x413m.
MLA Handbook (7th Edition):
Maruta, Admasu A. “Heterogeneity in Attitudes Underlying Preferences for
Genomic Technology Producing Hybrid Poplars on Public Land.” 2016. Web. 02 Mar 2021.
Vancouver:
Maruta AA. Heterogeneity in Attitudes Underlying Preferences for
Genomic Technology Producing Hybrid Poplars on Public Land. [Internet] [Masters thesis]. University of Alberta; 2016. [cited 2021 Mar 02].
Available from: https://era.library.ualberta.ca/files/c6682x413m.
Council of Science Editors:
Maruta AA. Heterogeneity in Attitudes Underlying Preferences for
Genomic Technology Producing Hybrid Poplars on Public Land. [Masters Thesis]. University of Alberta; 2016. Available from: https://era.library.ualberta.ca/files/c6682x413m
University of Pretoria
15.
De Beer,
Yolandi-Mari.
Determinants and
consequences of elephant spatial use in Southern Africa’s arid
savannas.
Degree: Zoology and Entomology, 2008, University of Pretoria
URL: http://hdl.handle.net/2263/27195
► Resources that can optimize survival are distributed unevenly across landscapes. I assumed that the distribution of these resources is reflected by landscape heterogeneity and that…
(more)
▼ Resources that can optimize survival are distributed
unevenly across landscapes. I assumed that the distribution of
these resources is reflected by landscape
heterogeneity and that
selection for areas with relatively high
heterogeneity reflects on
selection for resources. I therefore hypothesized that landscape
heterogeneity determines variability in elephant home range
location and size. I evaluated home range sizes for elephants
living in the Etosha National Park (n = 6), Khaudum Game Reserve (n
= 6) and Ngamiland District 11 (n = 4) during two wet and two dry
seasons. I used raster grid landscape maps, which were based on
structural classes, to superimpose elephant home ranges and to
generate randomly located ranges. I then used the FRAGSTATS
programme to calculate five landscape metrics that measure aspects
of
heterogeneity within elephant and randomly located ranges. I
compared landscape
heterogeneity of the three study areas using the
landscape metrics calculated for the randomly located ranges.
Assuming that higher values of Patch density, Lanscape shape index
and Shannon diversity index, and lower values of Largest patch
index and Contagion implies selection for
heterogeneity, I
qualitatively compared the distribution and the mean of the
landscape metric values for the elephant home ranges with those for
the randomly located ranges. The influence of season on selection
for the landscape metrics was also evaluated. I searched for
relationships between home range size and landscape metrics for the
three study areas and searched for a possible relationship between
home range size and water point density for elephants in Etosha and
Khaudum. Khaudum was consistently more heterogeneous than Etosha
and NG11, while the latter was the least heterogeneous. Within
these study areas, at least some of the landscape metrics may
explain the location of elephant home ranges. The consistent
apparent selection for areas with relatively higher values of
Landscape shape index and Shannon diversity index and lower values
of Largest patch index and Contagion across both wet and/or dry
seasons by elephants in Etosha and NG11 suggests that landscape
heterogeneity can explain landscape selection by elephants. This
did not hold for elephants in Khaudum where elephants
inconsistently selected for Largest patch index and Landscape shape
index. This study further suggested that landscape
heterogeneity
did not determine home range size. However, water was a strong
determinant of home range size and may therefore explain the lack
of selection for
heterogeneity in Khaudum.
Heterogeneity is an
inherent characteristic of landscapes and seems to reflect on the
availability of resources that may subsequently influence the way
elephants use space. My study supported the concept that increasing
space, while promoting
heterogeneity for elephants may enhance
range expansion. The management of elephants should therefore be
directed at optimising the availability of heterogeneous landscapes
when setting land aside for their conservation. Management…
Advisors/Committee Members: Prof R J van Aarde (advisor).
Subjects/Keywords: Khaudum; Landscape
heterogeneity;
Etosha;
UCTD
Record Details
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Share »
Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Beer,
Yolandi-Mari, D. (2008). Determinants and
consequences of elephant spatial use in Southern Africa’s arid
savannas. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/27195
Chicago Manual of Style (16th Edition):
Beer,
Yolandi-Mari, De. “Determinants and
consequences of elephant spatial use in Southern Africa’s arid
savannas.” 2008. Masters Thesis, University of Pretoria. Accessed March 02, 2021.
http://hdl.handle.net/2263/27195.
MLA Handbook (7th Edition):
Beer,
Yolandi-Mari, De. “Determinants and
consequences of elephant spatial use in Southern Africa’s arid
savannas.” 2008. Web. 02 Mar 2021.
Vancouver:
Beer,
Yolandi-Mari D. Determinants and
consequences of elephant spatial use in Southern Africa’s arid
savannas. [Internet] [Masters thesis]. University of Pretoria; 2008. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2263/27195.
Council of Science Editors:
Beer,
Yolandi-Mari D. Determinants and
consequences of elephant spatial use in Southern Africa’s arid
savannas. [Masters Thesis]. University of Pretoria; 2008. Available from: http://hdl.handle.net/2263/27195
Cornell University
16.
Faessler, Lauren.
Innovation Without Change Or Extinction: An Institutional Analysis Of The Persistence Of Alternative Schools.
Degree: PhD, Education, 2014, Cornell University
URL: http://hdl.handle.net/1813/37097
► U.S. public schools systematically serve some student populations better than others. Higher expectations, more resources, more rigorous content and instruction, and priorities reflecting students' purposes…
(more)
▼ U.S. public schools systematically serve some student populations better than others. Higher expectations, more resources, more rigorous content and instruction, and priorities reflecting students' purposes for education support opportunity for some. Social unrest in the 1960s reframed diverse education outcomes for students as inequity, a problem for democracy and civil rights. In that milieu, public secondary alternative schools emerged as innovative response to this socially articulated and shared problem in public education. In the first decade of the 21st century, public secondary alternative schools (alternative schools) serve consistently around 2.3% of secondary students in the U.S., about 600,000 students annually. Institutional theory predicts that innovative organizations in highly institutionalized sectors, like U.S. public education, will not persist as heterogeneous alternatives. Current models (Greenwood, Suddaby & Hinings, 2002) describe an institutional change path for innovation to either institutionalization, institutionalized organizations in a field adopt the innovative structures and practices, or extinction as fad or fashion. But, alternative schools have persisted as heterogeneous alternatives for more than forty years. This study addresses the question, "what about the role of public alternative schools allows them to persist as peripheral heterogeneous organizations in the institutionalized field of U.S. public secondary schools?" A mixed methods approach to this study allows inquiry and analysis into multiple levels of the institutional dynamics: 1) an analysis of the history of alternative schools, as organizations that evolve to address unmet priorities for changing populations underserved by traditional school organizations, connects alternative structures and practices to stakeholders' alternative priorities for these schools; 2) a longitudinal analysis, of National Center for Education Statistics (NCES) demographic and resource data, describes trends in differences between traditional and alternative secondary schools in the U.S. and makes the case that alternative schools engage in their work with different student populations and different levels of resources; and, 3) two case studies explain work that is understood as important for different stakeholders in two, different type alternative schools. The accounts of that work legitimate school structures and practices, and the schools themselves. Findings trace alternative schools as innovation through the Stages of Institutional Change (Suddaby, et al., 2002) arguing for a third path of persistence for alternative heterogeneous organizations in institutionalized environments. Alternative schools address diverse priorities for public education in the U.S.; serve high-needs populations of students in much higher concentrations than regular schools and with fewer resources; and these schools may need to maintain their
heterogeneity to effectively address the priorities of local constituent groups. Alternative schools stabilize the field…
Advisors/Committee Members: Sipple, John W (chair), Brown, David L (committee member), Hamilton, Stephen Frederic (committee member).
Subjects/Keywords: Alternative Schools; Institutional Change; Heterogeneity
Record Details
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Record Details
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❌
APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Faessler, L. (2014). Innovation Without Change Or Extinction: An Institutional Analysis Of The Persistence Of Alternative Schools. (Doctoral Dissertation). Cornell University. Retrieved from http://hdl.handle.net/1813/37097
Chicago Manual of Style (16th Edition):
Faessler, Lauren. “Innovation Without Change Or Extinction: An Institutional Analysis Of The Persistence Of Alternative Schools.” 2014. Doctoral Dissertation, Cornell University. Accessed March 02, 2021.
http://hdl.handle.net/1813/37097.
MLA Handbook (7th Edition):
Faessler, Lauren. “Innovation Without Change Or Extinction: An Institutional Analysis Of The Persistence Of Alternative Schools.” 2014. Web. 02 Mar 2021.
Vancouver:
Faessler L. Innovation Without Change Or Extinction: An Institutional Analysis Of The Persistence Of Alternative Schools. [Internet] [Doctoral dissertation]. Cornell University; 2014. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1813/37097.
Council of Science Editors:
Faessler L. Innovation Without Change Or Extinction: An Institutional Analysis Of The Persistence Of Alternative Schools. [Doctoral Dissertation]. Cornell University; 2014. Available from: http://hdl.handle.net/1813/37097
Penn State University
17.
Skocik, Mariya.
Effects of Spatial Heterogeneity on Calcite Dissolution Rates.
Degree: 2014, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/21249
► The prediction of carbonate reservoirs behavior, including rock and fluid interactions, is challenging due to their complex mineralogy, porosity, and permeability heterogeneities. Calcite dissolution, one…
(more)
▼ The prediction of carbonate reservoirs behavior, including rock and fluid interactions, is challenging due to their complex mineralogy, porosity, and permeability heterogeneities. Calcite dissolution, one of the most important subsurface reactions, has been studied since late 19th century with a sole focus on homogeneous systems. First studies of more realistic heterogeneous systems started in the past couple of years.
This work examines the effects of geochemical
heterogeneity on calcite dissolution rates with variable permeability contrasts, flow rates, and inlet pH. The investigation consisted of the two major parts: column experiments for dissolution data and reactive flow modeling by the use of CrunchFlow software that simulated the laboratory set-up. Two pairs of 10 cm long and 2.5 cm in diameter columns were wet packed with inert quartz and reactive calcite. The sets’ permeability contrasts were 0.5 and 0.83. Each set contained a Mixed Column, representing a homogeneous system, and a One-Zone Column, a heterogeneous system with a cylindrical calcite insertion along the principal flow direction. The inlet solution was injected upwards through the columns at flow rates between 0.03 and 6.3mL/min with pH at 4 and 6.7. The effluent samples were collected at the outlet of the column up to 10 residence times with variable time steps. The modeling was performed via CrunchFlow reactive flow software package. CrunchFlow simultaneously solves systems of differential transport equations for each grid block of the discretized system representation for each primary species. The reactive flow model was calibrated based on laboratory obtained calcite effluent breakthrough data for the slowest and fastest flow rates.
Under low flow rates where the system reaches equilibrium, the column scale bulk dissolution rates varied between 1.02 and 1.55×10-11 mol/ m2/s, producing effluent calcium concentrations between 1.43 and 2.17×10-4 mol/L. The rates of the Mixed Columns were on average 1.25 times higher than those of the corresponding One-Zone Columns. At higher flow rates, under prevalent kinetic regime with transport rates higher than reaction rates, the dissolution rates increased up to 10-9 mol/ m2/s order of magnitude. The calcium concentration ranged between orders of magnitude 10-5 mol/L for One-Zone Columns and 10-4 mol/L for the Mixed Columns. The dissolution reaction occurred mostly at the interface of calcite and quartz the One-Zone Columns, leading to significantly lower rates than those in Mixed Columns, where all calcite and quartz grains were well-mixed. After matching the experimental data, more simulations were carried out under an array of was flow rate conditions between 0.03mL/min and 13mL/min with permeability contrasts between 0.01 and 12. Model results showed that the discrepancy of the dissolution rate of One-Zone Columns in comparison to the corresponding Mixed Columns increased with increase in flow velocity. The simulations also showed that that under conditions where permeability of calcite zone is…
Advisors/Committee Members: Dr Li Li, Thesis Advisor/Co-Advisor, William Arthur Groves, Thesis Advisor/Co-Advisor, Mark Stephen Klima, Thesis Advisor/Co-Advisor, Dr Luis Ayala, Thesis Advisor/Co-Advisor.
Subjects/Keywords: Carbonate Heterogeneity; Dissolution Rate; CrunhFlow
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APA (6th Edition):
Skocik, M. (2014). Effects of Spatial Heterogeneity on Calcite Dissolution Rates. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/21249
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):
Skocik, Mariya. “Effects of Spatial Heterogeneity on Calcite Dissolution Rates.” 2014. Thesis, Penn State University. Accessed March 02, 2021.
https://submit-etda.libraries.psu.edu/catalog/21249.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Skocik, Mariya. “Effects of Spatial Heterogeneity on Calcite Dissolution Rates.” 2014. Web. 02 Mar 2021.
Vancouver:
Skocik M. Effects of Spatial Heterogeneity on Calcite Dissolution Rates. [Internet] [Thesis]. Penn State University; 2014. [cited 2021 Mar 02].
Available from: https://submit-etda.libraries.psu.edu/catalog/21249.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Skocik M. Effects of Spatial Heterogeneity on Calcite Dissolution Rates. [Thesis]. Penn State University; 2014. Available from: https://submit-etda.libraries.psu.edu/catalog/21249
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Penn State University
18.
Moon, Jessica Beth.
Edaphic properties, their heterogeneity, and associated microbial communities in headwater wetland complexes of the Ridge and Valley Region, Pennsylvania.
Degree: 2012, Penn State University
URL: https://submit-etda.libraries.psu.edu/catalog/14486
► Small in area, headwater wetland complexes provide a disproportionate share of valuable ecosystem functions to the larger landscape. Through microbial biochemical cycling of large portions…
(more)
▼ Small in area, headwater wetland complexes provide a disproportionate share of valuable ecosystem functions to the larger landscape. Through microbial biochemical cycling of large portions of the global carbon and nitrogen pools, they act as sinks for and transformers of inorganic nutrients and as sources of organic material to aquatic systems. Our current understanding of these systems suggests that anthropogenic activities have altered their hydrologic disturbance regimes with subsequent material fluxes and changed the structure of their biologic components (e.g., vegetation, macroinvertebrates, and birds). These changes can ultimately affect microbial biochemical cycling. In this dissertation I evaluated the condition of headwater wetland complexes, in terms of their edaphic properties, edaphic
heterogeneity, and microbial communities in two landscape contexts, forested (> 80% forested) and mixed (< 50 % forested), with mixed complexes also having a range of land use legacies. Edaphic properties and
heterogeneity did vary between forested and mixed complexes. Edaphic
heterogeneity measurements were higher in forested complexes compared to mixed complexes. The most homogenized complexes were those in mixed landscapes with past residential, cropland, and fill activities. In forested complexes the spatial
heterogeneity of edaphic properties, most notably of soil organic matter (SOM) and soil moisture, were associated with a range of microbial habitats that varied in microbial biomass and composition. This range in microbial habitats was absent from complexes within mixed landscapes. In fact, these complexes, although left to reestablish after legacy land uses, were not necessary developing microbial communities similar to those in forested landscapes. This was evident through the differences between microbial community composition, pH, and soil texture classes of mineral soils across the landscape classes. The large difference in SOM accumulation between landscape contexts was further assessed by developing a method to characterize a portion of the labile SOM pool. This fraction was quantitatively and compositionally more sensitive to landscape context than SOM levels. The overall lack of SOM accumulation in mixed complexes was attributed to differences in vegetative community composition and structure (via temperature shifts), and hydrological regime shifts thought to affect litter quality inputs, decomposition rates, and/or the amount of scouring.
Advisors/Committee Members: Denice Heller Wardrop, Dissertation Advisor/Co-Advisor, Robert P Brooks, Committee Chair/Co-Chair, Maryann Victoria Bruns, Committee Member, Jason Philip Kaye, Committee Member, Jennifer Macalady, Committee Member, Douglas Archibald, Committee Member.
Subjects/Keywords: wetlands; soils; microbial communities; heterogeneity
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APA (6th Edition):
Moon, J. B. (2012). Edaphic properties, their heterogeneity, and associated microbial communities in headwater wetland complexes of the Ridge and Valley Region, Pennsylvania. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/14486
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):
Moon, Jessica Beth. “Edaphic properties, their heterogeneity, and associated microbial communities in headwater wetland complexes of the Ridge and Valley Region, Pennsylvania.” 2012. Thesis, Penn State University. Accessed March 02, 2021.
https://submit-etda.libraries.psu.edu/catalog/14486.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Moon, Jessica Beth. “Edaphic properties, their heterogeneity, and associated microbial communities in headwater wetland complexes of the Ridge and Valley Region, Pennsylvania.” 2012. Web. 02 Mar 2021.
Vancouver:
Moon JB. Edaphic properties, their heterogeneity, and associated microbial communities in headwater wetland complexes of the Ridge and Valley Region, Pennsylvania. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Mar 02].
Available from: https://submit-etda.libraries.psu.edu/catalog/14486.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Moon JB. Edaphic properties, their heterogeneity, and associated microbial communities in headwater wetland complexes of the Ridge and Valley Region, Pennsylvania. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/14486
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Texas A&M University
19.
Son, Jungrak.
Numerical Simulation of Seismic Wave Propagation in the Presence of Complex Near-Surface Heterogeneity Including Surface Topography.
Degree: MS, Geophysics, 2015, Texas A&M University
URL: http://hdl.handle.net/1969.1/155570
► Surface wave analysis and inversion have been developed to improve P-wave imaging for hydrocarbon reservoirs in land environments. This requires elastic wave modeling validation based…
(more)
▼ Surface wave analysis and inversion have been developed to improve P-wave imaging for hydrocarbon reservoirs in land environments. This requires elastic wave modeling validation based on an accurate near-surface geology model. However, conventional modeling approaches with uniform grids pose significant challenges to represent complex geometry of near-surface heterogeneities and irregular surface topography. To solve this issue, numerical simulation of elastic wave propagation is implemented based on the spectral-element method, which is ideal for applying flexible unstructured grids. Locally-refined hybrid grids are used to describe the complex boundaries of subsurface structures, and refined grids are effective to reduce computational costs.
Three representative examples of geological features as near-surface heterogeneities are analyzed in seismic modeling with synthetic earth models. The structures are a shallow small scatterer, a collapsed karst structure and a low-velocity top layer with surface topography. The earth model geometry and material properties are based on the data from the recently released SEAM 2 project “arid model.” The resulting seismograms show that scattered surface waves from the shallow velocity anomalies are affected by the shape of modeling grids, properties of filling materials, attenuation, and curved surface topography. Specifically, the shallow scatterer, which is filled with low-velocity materials, shows a significant amount of trapped seismic energy and generates multiple scattered surface waves. These unwanted waves from trapped energy are strongly based on the surface topography and attenuation factor, Q. Since scattered surface waves are sensitively affected by various geological features and modeling factors, advanced seismic forward modeling approaches should be used for the accurate near-surface modeling. This study shows the capability and potential of the spectral-element method with advanced conforming grids to handle high impedance contrast boundaries for the analysis of interaction between the seismic wave scattering and complex heterogeneous shallow media. It will lead to improve distinguishing of seismic noise caused by shallow anomalies from the valuable signals associated with hydrocarbon reservoirs.
Advisors/Committee Members: Gibson, Richard (advisor), Duan, Benchun (advisor), Efendiev, Yalchin (committee member).
Subjects/Keywords: elastic wave; heterogeneity; topography
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APA ·
Chicago ·
MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Son, J. (2015). Numerical Simulation of Seismic Wave Propagation in the Presence of Complex Near-Surface Heterogeneity Including Surface Topography. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/155570
Chicago Manual of Style (16th Edition):
Son, Jungrak. “Numerical Simulation of Seismic Wave Propagation in the Presence of Complex Near-Surface Heterogeneity Including Surface Topography.” 2015. Masters Thesis, Texas A&M University. Accessed March 02, 2021.
http://hdl.handle.net/1969.1/155570.
MLA Handbook (7th Edition):
Son, Jungrak. “Numerical Simulation of Seismic Wave Propagation in the Presence of Complex Near-Surface Heterogeneity Including Surface Topography.” 2015. Web. 02 Mar 2021.
Vancouver:
Son J. Numerical Simulation of Seismic Wave Propagation in the Presence of Complex Near-Surface Heterogeneity Including Surface Topography. [Internet] [Masters thesis]. Texas A&M University; 2015. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1969.1/155570.
Council of Science Editors:
Son J. Numerical Simulation of Seismic Wave Propagation in the Presence of Complex Near-Surface Heterogeneity Including Surface Topography. [Masters Thesis]. Texas A&M University; 2015. Available from: http://hdl.handle.net/1969.1/155570
University of Toronto
20.
Odame, Jodie.
Molecular Characterization of Preeclampsia In Vivo and In Vitro.
Degree: 2014, University of Toronto
URL: http://hdl.handle.net/1807/75764
► Preeclampsia (PE) is a hypertensive disorder of pregnancy characterized by poor placental development. Unfortunately, variations in PE pathogenesis have made management and development of effective…
(more)
▼ Preeclampsia (PE) is a hypertensive disorder of pregnancy characterized by poor placental development. Unfortunately, variations in PE pathogenesis have made management and development of effective intervention agents difficult. An improved understanding of the molecular basis of PE is required to properly classify this complex disease, and determine effects drugs may have on molecular profiles. Here, we sought to characterize the molecular profiles present in PE, and intervention agent heparin's effect on these profiles. Proteomic analysis of placentas from the BPH5 PE mice model revealed differential protein expression and increased Stat3 phosphorylation compared to wild-type mice. Increased Stat3 phosphorylation was also observed in an additional in vivo, and one in vitro PE model. Microarray and phospho-proteomic analysis revealed differential effects of heparin on molecular profiles in in vivo and in vitro PE models. Identifying molecular pathways altered and which pathways heparin targets in PE may aid in designing individualized therapeutic approaches.
M.Sc.
2017-02-28 00:00:00
Advisors/Committee Members: Cox, Brian, Physiology.
Subjects/Keywords: heterogeneity; preeclampsia; pregnancy; 0719
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APA (6th Edition):
Odame, J. (2014). Molecular Characterization of Preeclampsia In Vivo and In Vitro. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/75764
Chicago Manual of Style (16th Edition):
Odame, Jodie. “Molecular Characterization of Preeclampsia In Vivo and In Vitro.” 2014. Masters Thesis, University of Toronto. Accessed March 02, 2021.
http://hdl.handle.net/1807/75764.
MLA Handbook (7th Edition):
Odame, Jodie. “Molecular Characterization of Preeclampsia In Vivo and In Vitro.” 2014. Web. 02 Mar 2021.
Vancouver:
Odame J. Molecular Characterization of Preeclampsia In Vivo and In Vitro. [Internet] [Masters thesis]. University of Toronto; 2014. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1807/75764.
Council of Science Editors:
Odame J. Molecular Characterization of Preeclampsia In Vivo and In Vitro. [Masters Thesis]. University of Toronto; 2014. Available from: http://hdl.handle.net/1807/75764
University of Texas Southwestern Medical Center
21.
Steininger, Robert Joseph, III.
Investigating Roles for Cellular Heterogeneity in Cancer.
Degree: 2014, University of Texas Southwestern Medical Center
URL: http://hdl.handle.net/2152.5/3589
► Cell populations, even those derived from a single clone, can exhibit a high degree of phenotypic variability. However, most biological studies take measurements as averages…
(more)
▼ Cell populations, even those derived from a single clone, can exhibit a high degree of phenotypic variability. However, most biological studies take measurements as averages of entire populations without consideration for the underlying distribution of cellular phenotypes. Though there is growing evidence that variability within cellular populations has some functional consequences, the significance of cell to cell
heterogeneity is still poorly understood. Here, we present an analytical platform that represents
heterogeneity of cell populations as mixtures of distinct cell phenotypes, or subpopulations, based on immunofluorescent images. These "subpopulation profiles" make the
heterogeneity of cell populations more tractable and comparable. We go on to demonstrate that subpopulation profiles can be predictive of clonal populations' drug responses. This separation is shown to be independent of the population's cell-cycle distribution. The subpopulation profiles are then shown to be robust population readouts and used to classify diverse cell lines. We show that, in diverse panels of cell populations, the relationship between basal state
heterogeneity and drug response tends to break down. We also show, however, that the subpopulation profiles of diverse cell lines can be useful for identifying independently informative biomarkers. Taken together, these results demonstrate that a subpopulation level reduction of
heterogeneity can be a useful readout of cell populations with many potential applications.
Advisors/Committee Members: Pearson, Gray W., Ranganathan, Rama, White, Michael A., Altschuler, Steven J., Wu, Lani.
Subjects/Keywords: Genetic Heterogeneity; Neoplasms; Physiological Processes
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APA ·
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Manager
APA (6th Edition):
Steininger, Robert Joseph, I. (2014). Investigating Roles for Cellular Heterogeneity in Cancer. (Thesis). University of Texas Southwestern Medical Center. Retrieved from http://hdl.handle.net/2152.5/3589
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):
Steininger, Robert Joseph, III. “Investigating Roles for Cellular Heterogeneity in Cancer.” 2014. Thesis, University of Texas Southwestern Medical Center. Accessed March 02, 2021.
http://hdl.handle.net/2152.5/3589.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Steininger, Robert Joseph, III. “Investigating Roles for Cellular Heterogeneity in Cancer.” 2014. Web. 02 Mar 2021.
Vancouver:
Steininger, Robert Joseph I. Investigating Roles for Cellular Heterogeneity in Cancer. [Internet] [Thesis]. University of Texas Southwestern Medical Center; 2014. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/2152.5/3589.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Steininger, Robert Joseph I. Investigating Roles for Cellular Heterogeneity in Cancer. [Thesis]. University of Texas Southwestern Medical Center; 2014. Available from: http://hdl.handle.net/2152.5/3589
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Toronto
22.
Wang, Ao.
Environmental Robustness in Populations Adapted to Constant Environments and Heterogeneous Environments.
Degree: 2017, University of Toronto
URL: http://hdl.handle.net/1807/79245
► Environmental robustness is the reduction of phenotypic variation under environmental perturbation and is essential for populations to persist in stressful conditions, but few empirical studies…
(more)
▼ Environmental robustness is the reduction of phenotypic variation under environmental perturbation and is essential for populations to persist in stressful conditions, but few empirical studies have examined the conditions under which robustness evolve. Here we consider two hypotheses, robustness evolves via environmental heterogeneity or as a by-product of adaption to specific constant environments. We assessed environmental robustness in juvenile viability of 20 D. melanogaster populations evolving under constant or heterogeneous environments. Contrary to prediction, in the original selective environments, populations from heterogeneous regimes were not the most robust ones. In the novel environments, populations from the constant salt regime were more robust than populations from the constant cadmium regime. Populations from heterogeneous regimes had intermediate level of robustness. Our results suggest that environmental robustness is an indirect product of adaptation to specific environments and environmental heterogeneity plays a relative less important role in inducing robustness than the details of adaptation.
M.Sc.
Advisors/Committee Members: Agrawal, Aneil F., Ecology and Evolutionary Biology.
Subjects/Keywords: Environmental Heterogeneity; Plasticity; Robustness; 0306
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APA ·
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APA (6th Edition):
Wang, A. (2017). Environmental Robustness in Populations Adapted to Constant Environments and Heterogeneous Environments. (Masters Thesis). University of Toronto. Retrieved from http://hdl.handle.net/1807/79245
Chicago Manual of Style (16th Edition):
Wang, Ao. “Environmental Robustness in Populations Adapted to Constant Environments and Heterogeneous Environments.” 2017. Masters Thesis, University of Toronto. Accessed March 02, 2021.
http://hdl.handle.net/1807/79245.
MLA Handbook (7th Edition):
Wang, Ao. “Environmental Robustness in Populations Adapted to Constant Environments and Heterogeneous Environments.” 2017. Web. 02 Mar 2021.
Vancouver:
Wang A. Environmental Robustness in Populations Adapted to Constant Environments and Heterogeneous Environments. [Internet] [Masters thesis]. University of Toronto; 2017. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/1807/79245.
Council of Science Editors:
Wang A. Environmental Robustness in Populations Adapted to Constant Environments and Heterogeneous Environments. [Masters Thesis]. University of Toronto; 2017. Available from: http://hdl.handle.net/1807/79245
University of Houston
23.
Zhao, Luanxiao 1986-.
POROELASTIC AND SEISMIC CHARACTERIZATION OF HETEROGENEOUS RESERVOIR ROCKS.
Degree: PhD, Geophysics, 2014, University of Houston
URL: http://hdl.handle.net/10657/1784
► The primary focus of this dissertation is to link the poroelastic model that couples rock’s elastic and hydraulic properties to seismic characterization of the heterogeneous…
(more)
▼ The primary focus of this dissertation is to link the poroelastic model that couples rock’s elastic and hydraulic properties to seismic characterization of the heterogeneous reservoirs.
I have presented how to incorporate the dynamic poroelastic responses of microscopic and mesoscopic flow into the classical Biot theory. The resulting effective Biot media can capture the characteristics of velocity dispersion and wave attenuation in heterogeneous media. On the basis of this effective Biot media, I developed an approach to quantify the impact of both global flow and local flow simultaneously on the signatures of seismic reflectivity. The computed poroelastic reflections not only depend on the elastic properties contrast and incident angle, but also rely on the fluid mobility and observational frequency. For a typical shale-sand reflector, we find that the effect of local flow causes reflection amplitude variations in frequency to be as high as 40%, and a maximum phase shift as high as 12 degrees at the seismic exploration frequency band. However, the global flow effect on reflectivity is almost trivial (<1.5%) and occurs mainly at ultrasonic frequency band.
Poroelastic seismic analysis shows that ignoring the dispersion behavior of seismic reflection can lead to inaccurate seismic imaging and misleading interpretation of reservoir properties. I further demonstrate that the AVO response at the interface is strongly impacted by the reflection dispersion behavior: the bright spot (Class III AVO) gets brighter at lower frequency, the dim spot (Class I AVO) gets dimmer at lower frequency, and the Class II AVO reservoir exhibits significant phase distortion in the frequency domain. It is found that, for certain permeability ranges (about 2 orders of magnitude), seismic amplitude can exhibit an almost linear relationship with permeability variation. For Class III AVO reservoir scenario, high fluid mobility zones usually enhance the seismic amplitude; while for Class I AVO reservoir scenario, high fluid mobility zones weaken the seismic amplitude.
Finally, a field case study on the Offshore Brazil data set shows that poroelastic reflection from the interface of underlain carbonate with overburden marlstone exhibits considerably different frequency behavior at two nearby wells. Based on the poroelastic modeling, this discrepancy is likely to be caused by the fact that the fluid mobility in the underlain grainstone at well A is remarkably greater than that in the underlain packstone at well B.
Advisors/Committee Members: Han, De-Hua (advisor), Stewart, Robert R. (advisor), Castagna, John P. (committee member), Nasser, Mosab (committee member).
Subjects/Keywords: Poroelastic; Seismic; Heterogeneity; Reservoir characterization
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APA (6th Edition):
Zhao, L. 1. (2014). POROELASTIC AND SEISMIC CHARACTERIZATION OF HETEROGENEOUS RESERVOIR ROCKS. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1784
Chicago Manual of Style (16th Edition):
Zhao, Luanxiao 1986-. “POROELASTIC AND SEISMIC CHARACTERIZATION OF HETEROGENEOUS RESERVOIR ROCKS.” 2014. Doctoral Dissertation, University of Houston. Accessed March 02, 2021.
http://hdl.handle.net/10657/1784.
MLA Handbook (7th Edition):
Zhao, Luanxiao 1986-. “POROELASTIC AND SEISMIC CHARACTERIZATION OF HETEROGENEOUS RESERVOIR ROCKS.” 2014. Web. 02 Mar 2021.
Vancouver:
Zhao L1. POROELASTIC AND SEISMIC CHARACTERIZATION OF HETEROGENEOUS RESERVOIR ROCKS. [Internet] [Doctoral dissertation]. University of Houston; 2014. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10657/1784.
Council of Science Editors:
Zhao L1. POROELASTIC AND SEISMIC CHARACTERIZATION OF HETEROGENEOUS RESERVOIR ROCKS. [Doctoral Dissertation]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1784
Boston College
24.
Cai, Jinghan.
Essays in financial economics.
Degree: PhD, Economics, 2014, Boston College
URL: http://dlib.bc.edu/islandora/object/bc-ir:103579
► This dissertation covers three essays in the realm of investor heterogeneity. Traditional financial economics theories assume that agents are identical. However, daily practice of finance…
(more)
▼ This dissertation covers three essays in the realm of
investor
heterogeneity. Traditional financial economics theories
assume that agents are identical. However, daily practice of
finance exhibits phenomena that cannot be explained in the context
of homogeneous agents. Thus behavioral economists relax the agent
homogeneity assumption and allow different types of agents to
interplay, which can explain a series of phenomena, including
bubbles (Scheinkman and Xiong, 2003,etc), among others. The first
chapter of this dissertation answers the question: what kind of
investors flock to an IPO – mostly sophisticated or mostly naive?
The answer to this question points to explaining the puzzlingly
extreme trading volume on the first day after an IPO. Existing
explanations rely on institutions such as day trading, short
selling and inter-dealer trades, yet IPO frenzies are common even
when these are entirely absent. Recent evidence points to the
possible importance of sentiment from retail investors, but it is
not yet clear what kind of retail investors might be harboring
these emotions. I access a unique data set for Chinese IPOs that
measures investor experience and trading records. I find that
inexperienced investors are initially drawn to the IPO while
established investors remain on the sidelines. Over time, investor
composition shifts in favor of experienced investors. More
importantly, I identify market timing of purchase (together with
the timing of selling, the purchase price, etc, which I define as
the decision bundle) as the predominant channel for determining
heterogeneity in returns for experienced versus for inexperienced
investors. Furthermore, I find that investors do learn to be more
patient and get better investment performance thereof. Also, I am
able to depict the learning curve by documenting that the marginal
effect of learning varies across the level of stock of experience,
and across heterogeneous investor type. The second chapter examines
the effect of short selling via the unique setting in the Hong Kong
stock market and find that, when a stock becomes shortable, its
trading activities decrease, liquidities worsen, and information
asymmetries increase. This finding contradicts both the existing
theoretical models, and recent empirical studies using global
financial crisis data. We extend the sequential trading model with
short-sales constraints of one asset by Diamond and Verrecchia
(1987) to the case of multiple assets. The model predicts that our
empirical results are due to uninformed traders switching their
tradings to non-shortable securities. Chapter 3 uses a unique short
selling setting in Hong Kong stock market, and tests the Chen and
Singal (2003) hypothesis that speculative short sellers add to the
selling pressure on Mondays and hence add to the weekend effect. We
document that, first, the weekend effect exists in Hong Kong stock
market, regardless of the existence of short sale constraints;
second, after introducing short selling, the individual stocks face
more significant weekend effect.…
Advisors/Committee Members: Zhijie Xiao (Thesis advisor).
Subjects/Keywords: behavioral finance; investor heterogeneity
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Manager
APA (6th Edition):
Cai, J. (2014). Essays in financial economics. (Doctoral Dissertation). Boston College. Retrieved from http://dlib.bc.edu/islandora/object/bc-ir:103579
Chicago Manual of Style (16th Edition):
Cai, Jinghan. “Essays in financial economics.” 2014. Doctoral Dissertation, Boston College. Accessed March 02, 2021.
http://dlib.bc.edu/islandora/object/bc-ir:103579.
MLA Handbook (7th Edition):
Cai, Jinghan. “Essays in financial economics.” 2014. Web. 02 Mar 2021.
Vancouver:
Cai J. Essays in financial economics. [Internet] [Doctoral dissertation]. Boston College; 2014. [cited 2021 Mar 02].
Available from: http://dlib.bc.edu/islandora/object/bc-ir:103579.
Council of Science Editors:
Cai J. Essays in financial economics. [Doctoral Dissertation]. Boston College; 2014. Available from: http://dlib.bc.edu/islandora/object/bc-ir:103579
University of Cambridge
25.
Luo, Hao.
Numerical Investigation of Hydrate-bearing Sediment Formation Heterogeneity during Methane Gas Recovery.
Degree: PhD, 2019, University of Cambridge
URL: https://www.repository.cam.ac.uk/handle/1810/298237
► The first offshore methane hydrate recovery trial was conducted in 2013 on the north slope of the Daini Atsumi Knoll in Eastern Nankai Trough, Japan.…
(more)
▼ The first offshore methane hydrate recovery trial was conducted in 2013 on the north slope of the Daini Atsumi Knoll in Eastern Nankai Trough, Japan. The methane hydrate concentrated zone (MHCZ) was roughly 300 m below the seafloor and 1300 m below sea level, with a dip to the northwest by roughly 20 degrees. For the target MHCZ in Eastern Nankai Trough site, there are several kinds of heterogeneity that are observed at the site, i.e. vertical heterogeneity, lateral heterogeneity, seafloor inclination, faults and seepages. In this study, a new fully coupled THMC simulator based on implicit finite element code in COMSOL is developed to simulate methane gas extraction from the heterogeneous ground. The effects of heterogeneity in turbidity formation on hydrate dissociation and geo-mechanical behaviour, as well as gas and water production rates, are studied from the following four aspects: vertical heterogeneity, thermal response processes, lateral heterogeneity / seafloor inclination, and fault patterns. Results show vertical heterogeneity, thermal response processes, and fault patterns have relatively large impact on the hydrate dissociation behaviour and gas/water production rates. The research examines whether a model that adopts the conventional parameter averaging method provide results equivalent to the results of the layered model. Based on the research findings above, the 2013 Nankai Trough trial was reanalyzed. Results show that the updated model considering soil and hydrate heterogeneity gave better matching of the gas / water production rates and temperature at the production and monitoring wells than the models used in the previous studies.
Subjects/Keywords: methane hydrate; heterogeneity; COMSOL
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APA (6th Edition):
Luo, H. (2019). Numerical Investigation of Hydrate-bearing Sediment Formation Heterogeneity during Methane Gas Recovery. (Doctoral Dissertation). University of Cambridge. Retrieved from https://www.repository.cam.ac.uk/handle/1810/298237
Chicago Manual of Style (16th Edition):
Luo, Hao. “Numerical Investigation of Hydrate-bearing Sediment Formation Heterogeneity during Methane Gas Recovery.” 2019. Doctoral Dissertation, University of Cambridge. Accessed March 02, 2021.
https://www.repository.cam.ac.uk/handle/1810/298237.
MLA Handbook (7th Edition):
Luo, Hao. “Numerical Investigation of Hydrate-bearing Sediment Formation Heterogeneity during Methane Gas Recovery.” 2019. Web. 02 Mar 2021.
Vancouver:
Luo H. Numerical Investigation of Hydrate-bearing Sediment Formation Heterogeneity during Methane Gas Recovery. [Internet] [Doctoral dissertation]. University of Cambridge; 2019. [cited 2021 Mar 02].
Available from: https://www.repository.cam.ac.uk/handle/1810/298237.
Council of Science Editors:
Luo H. Numerical Investigation of Hydrate-bearing Sediment Formation Heterogeneity during Methane Gas Recovery. [Doctoral Dissertation]. University of Cambridge; 2019. Available from: https://www.repository.cam.ac.uk/handle/1810/298237
Universitat Pompeu Fabra
26.
Caracciolo, Giacomo.
Essays on heterogeneity and macroeconomic dynamics.
Degree: Departament d'Economia i Empresa, 2019, Universitat Pompeu Fabra
URL: http://hdl.handle.net/10803/668366
► Limited asset market participation is a well-known stylized fact and a widespread phenomenon even in developed economies. While existing models have already examined the effects…
(more)
▼ Limited asset market participation is a well-known stylized fact and a widespread phenomenon
even in developed economies. While existing models have already examined
the effects of social security and its reforms on welfare and inequality, little attention
has been devoted to the role of public pensions in the context of limited asset market
participation. I develop a quantitative overlapping generations general equilibrium
model where heterogenous agents face a financial friction limiting access to capital markets.
I examine how, in presence of the market imperfection, a public pay-as-you-go
system affects consumption and wealth inequality and compare the results with a standard
model that does not account for limited asset market participation. In a second
exercise, I study the implications, in terms of inequality, of an increase in the retirement
age in response to a population ageing shock. I find that limited asset participation is
important for the analysis of the impact of social security on overall inequality and on
inequality within age groups.
Advisors/Committee Members: [email protected] (authoremail), true (authoremailshow), Debortoli, Davide (director), Galí, Jordi, 1961- (director).
Subjects/Keywords: Heterogeneity; Macroeconomic dynamics; 33
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APA (6th Edition):
Caracciolo, G. (2019). Essays on heterogeneity and macroeconomic dynamics. (Thesis). Universitat Pompeu Fabra. Retrieved from http://hdl.handle.net/10803/668366
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):
Caracciolo, Giacomo. “Essays on heterogeneity and macroeconomic dynamics.” 2019. Thesis, Universitat Pompeu Fabra. Accessed March 02, 2021.
http://hdl.handle.net/10803/668366.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Caracciolo, Giacomo. “Essays on heterogeneity and macroeconomic dynamics.” 2019. Web. 02 Mar 2021.
Vancouver:
Caracciolo G. Essays on heterogeneity and macroeconomic dynamics. [Internet] [Thesis]. Universitat Pompeu Fabra; 2019. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10803/668366.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Caracciolo G. Essays on heterogeneity and macroeconomic dynamics. [Thesis]. Universitat Pompeu Fabra; 2019. Available from: http://hdl.handle.net/10803/668366
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Delft University of Technology
27.
Stoop, Nick (author).
The effects of anisotropy and heterogeneity in the piping sensitive layer.
Degree: 2018, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:dd40b31f-33f1-479e-a6e0-8cbf836763be
► Levees are earthen structures that are designed to protect land from flooding and are commonly composed of impervious soils and built on sandy foundations. They…
(more)
▼ Levees are earthen structures that are designed to protect land from flooding and are commonly composed of impervious soils and built on sandy foundations. They are sensitive to an erosion process that is known as piping. After several years of investigation into piping, Sellmeijer proposed design rules by curve fitting results of a numerical model. The design rule are currently applied in the assessment of levees, despite being obtained under the assumption of uniform and homogenous subsoils. Consequently, the design rules seem to be fine for standard consultancy, but it is insufficient for heterogeneous and anisotropic. In this thesis, the effects of anisotropy and
heterogeneity are analysed in a elementary and a realistic numerical model study in order to improve the design rule of Sellmeijer. In the elementary study, several aquifers compositions are created by adding an artificial element with a different permeability to the body or by varying the permeability of the body depending on direction. The realistic study is a modification of the elementary study since stratified aquifer compositions have been implemented. After each simulation, the critical head computed in the elementary or realistic composition is compared to the critical head computed with Sellmeijer design rules which requires one calculation value of the bulk permeability. To improve the design rules an alternative method to determine the bulk permeability is proposed that assumes that there is curved or radial flow towards the exit point instead of the Dupuit method which assumes that there is only horizontal flow. As a consequence, the bulk permeability is calculated as the geometric or logarithmic mean of the vertical and horizontal permeability. Based on both studies, it can be concluded that both anisotropy and
heterogeneity in the aquifer greatly increase the critical head so that heterogeneous and anisotropic aquifers are significantly more resistant to piping. In some cases, the aquifer can withstand a 45% higher water level. Furthermore, Sellmeijer’s design rules more accurately approach the heterogeneous and anisotropic aquifer, if the bulk permeability is determined with the new approach.
Advisors/Committee Members: Kok, Matthijs (mentor), Kanning, Wim (mentor), van den Eijnden, Bram (mentor), ter Horst, Wouter (mentor), Heerema, Jan Jaap (mentor), Delft University of Technology (degree granting institution).
Subjects/Keywords: Piping; Heterogeneity; Anisotropy; Sellmeijer
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APA (6th Edition):
Stoop, N. (. (2018). The effects of anisotropy and heterogeneity in the piping sensitive layer. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:dd40b31f-33f1-479e-a6e0-8cbf836763be
Chicago Manual of Style (16th Edition):
Stoop, Nick (author). “The effects of anisotropy and heterogeneity in the piping sensitive layer.” 2018. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:dd40b31f-33f1-479e-a6e0-8cbf836763be.
MLA Handbook (7th Edition):
Stoop, Nick (author). “The effects of anisotropy and heterogeneity in the piping sensitive layer.” 2018. Web. 02 Mar 2021.
Vancouver:
Stoop N(. The effects of anisotropy and heterogeneity in the piping sensitive layer. [Internet] [Masters thesis]. Delft University of Technology; 2018. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:dd40b31f-33f1-479e-a6e0-8cbf836763be.
Council of Science Editors:
Stoop N(. The effects of anisotropy and heterogeneity in the piping sensitive layer. [Masters Thesis]. Delft University of Technology; 2018. Available from: http://resolver.tudelft.nl/uuid:dd40b31f-33f1-479e-a6e0-8cbf836763be
Delft University of Technology
28.
De Jong, T. (author).
Needle deflection in tissue.
Degree: 2015, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:e94441f3-8395-4529-acb1-8f251d35d932
► Introduction: One of the factors that contribute to the total needle-targeting error in medical procedures is needle deflection, which can lead to e.g. hemorrhage, prolonged…
(more)
▼ Introduction: One of the factors that contribute to the total needle-targeting error in medical procedures is needle deflection, which can lead to e.g. hemorrhage, prolonged intervention time and decreased treatment efficiency. This deflection can be defined as the deviation of the needle from its suspected straight insertion path. In this study, we focused on the effect of tissue heterogeneity on needle deflection. We hypothesized that needle deflection would be bigger for insertions into heterogeneous than homogeneous specimens, due to an unequal force distribution on the needle. Method: the inner needle of a 18Gauge trocar needle with triangular tip was inserted (5mm/s) multiple times at several positions into 4 gelatin-, 4 animal liver-, and 2 human liver specimens. Deflection in X- and Y-direction was measured using sliding gauges and axial forces acting on the needle were captured using a force sensor mounted onto the needle hub. Axial force analysis was used to give a rough estimation of the mechanical properties of the specimens. Results: Results show an increase in magnitude and variance for needle insertions into the liver specimens (Animal: Mean = 1.01mm, SD = 0.54, Human: Mean = 0.83mm, SD = 0.48) compared with those into gelatin specimens (Mean = 0.59mm, SD = 0.26mm). Differences between the median and maximal needle tip forces for insertions into gelatin were almost zero (Mean = 0.08, SD = 0.04N), whereas those differences were bigger for insertions into tissue specimens (Mean = 0.58, SD = 0.23N), indicating the homogeneous nature of gelatin and heterogeneous nature of tissue. Discussion: The results obtained in this study suggest that heterogeneity causes the needle to deflect from its straight path. Both magnitude and variance of needle deflection are bigger for insertions into heterogeneous tissue specimens than into homogeneous gelatin specimens. A suggestion for future research is to study the effect of pathologic tissue on needle deflection, as this type of tissue is known for being more heterogeneous than healthy tissue.
BioMechanical Engineering
Mechanical, Maritime and Materials Engineering
Advisors/Committee Members: Dankelman, J. (mentor), Van den Dobbelsteen, J.J. (mentor).
Subjects/Keywords: needle deflection; heterogeneity; gelatin; liver
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APA (6th Edition):
De Jong, T. (. (2015). Needle deflection in tissue. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:e94441f3-8395-4529-acb1-8f251d35d932
Chicago Manual of Style (16th Edition):
De Jong, T (author). “Needle deflection in tissue.” 2015. Masters Thesis, Delft University of Technology. Accessed March 02, 2021.
http://resolver.tudelft.nl/uuid:e94441f3-8395-4529-acb1-8f251d35d932.
MLA Handbook (7th Edition):
De Jong, T (author). “Needle deflection in tissue.” 2015. Web. 02 Mar 2021.
Vancouver:
De Jong T(. Needle deflection in tissue. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Mar 02].
Available from: http://resolver.tudelft.nl/uuid:e94441f3-8395-4529-acb1-8f251d35d932.
Council of Science Editors:
De Jong T(. Needle deflection in tissue. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:e94441f3-8395-4529-acb1-8f251d35d932
Victoria University of Wellington
29.
McDowall, Christopher.
A fish for all seasons: Spatial and temporal variation in patterns of demographic heterogeneity for Retropinna retropinna.
Degree: 2016, Victoria University of Wellington
URL: http://hdl.handle.net/10063/6250
► Demographic heterogeneity can have big effects on population dynamics, but for most species we have limited understanding of how and why individuals vary. Variation among…
(more)
▼ Demographic
heterogeneity can have big effects on population dynamics, but for most species we have limited understanding of how and why individuals vary. Variation among individuals is of particular importance for stage-structured populations, and/or where species have ‘complex life-cycles’. This is especially relevant in the case of amphidromous fishes that typically spawn in river mouths and estuaries, develop at sea and return to freshwater to finish development. These fish face strong selection pressures as they negotiate challenges around dispersal and development in order to reproduce successfully. Quantifying variation amongst individual fish can improve understanding of their population dynamics and suggest possible drivers of variation.
I evaluate patterns and sources of variation in demographic attributes of the New Zealand smelt (Retropinna retropinna). R. retropinna is an amphidromous fish that is endemic to New Zealand. While most populations have a sea-going larval stage, a number of landlocked freshwater populations occur, with the largest landlocked population residing in Lake Taupo. Here R. retropinna are presented with a variety of littoral feeding/spawning habitats and environmental conditions that may vary across distinct regions of the lake. In addition, the protracted spawning period for this species in Lake Taupo (occurring over eight months of the year) provides additional scope for seasonal variation to influence demographic attributes of individuals.
I sampled R. retropinna from discrete coastal habitats (beach or river) that were located in the eastern, southern and western regions of the lake. I evaluated patterns of variation in the size-structure, age-structure and morphology of R. retropinna among habitats and/or regions across Lake Taupo. I used otoliths to reconstruct demographic histories (ages, growth rates, hatch dates) of individuals, and used a set of statistical models to infer spatial variation in demographic histories. I found differences in size and age structure between regions, and a temporal effect of hatch date on larval/juvenile growth rates.
In addition, I obtained samples of R. retropinna from a sea-going population at the Hutt river mouth (sampled fish were presumed to be migrating upstream after their development period in Wellington Harbour and/or adjacent coastal environments). While Lake Taupo is large, deep, fresh, oligotrophic and strongly stratified for 8-9 months outside of winter, Wellington Harbour is less than a sixth of the area, shallow, saline, eutrophic and never stratified. These greatly differing environmental conditions led me to expect that these systems’ R. retropinna populations would carry significantly different demographic attributes. I compared the hatching phenology, recruitment age, body morphology, and individual growth histories (reconstructed from otoliths) of R. retropinna sampled from Lake Taupo and Wellington Harbour. I explored the relationships between demographic variation and environmental variation (water temperature,…
Advisors/Committee Members: Shima, Jeffrey.
Subjects/Keywords: Demographic heterogeneity; Otolith; Amphidromy
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APA (6th Edition):
McDowall, C. (2016). A fish for all seasons: Spatial and temporal variation in patterns of demographic heterogeneity for Retropinna retropinna. (Masters Thesis). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/6250
Chicago Manual of Style (16th Edition):
McDowall, Christopher. “A fish for all seasons: Spatial and temporal variation in patterns of demographic heterogeneity for Retropinna retropinna.” 2016. Masters Thesis, Victoria University of Wellington. Accessed March 02, 2021.
http://hdl.handle.net/10063/6250.
MLA Handbook (7th Edition):
McDowall, Christopher. “A fish for all seasons: Spatial and temporal variation in patterns of demographic heterogeneity for Retropinna retropinna.” 2016. Web. 02 Mar 2021.
Vancouver:
McDowall C. A fish for all seasons: Spatial and temporal variation in patterns of demographic heterogeneity for Retropinna retropinna. [Internet] [Masters thesis]. Victoria University of Wellington; 2016. [cited 2021 Mar 02].
Available from: http://hdl.handle.net/10063/6250.
Council of Science Editors:
McDowall C. A fish for all seasons: Spatial and temporal variation in patterns of demographic heterogeneity for Retropinna retropinna. [Masters Thesis]. Victoria University of Wellington; 2016. Available from: http://hdl.handle.net/10063/6250
30.
Hong, Sungki.
Cyclicality and Heterogeneity of Price Markup
.
Degree: PhD, 2017, Princeton University
URL: http://arks.princeton.edu/ark:/88435/dsp01736667118
► This dissertation studies the importance of firm-level price markup dynamics for business cycle fluctuations. In chapter one, I use recent IO techniques to measure the…
(more)
▼ This dissertation studies the importance of firm-level price markup dynamics for business cycle fluctuations. In chapter one, I use recent IO techniques to measure the behavior of markups over the business cycle at the firm level. I find that markups are countercyclical with an average elasticity of -0.9 with respect to real GDP, in line with the earlier industry-level evidence. Importantly, I find substantial
heterogeneity in markup cyclicality across firms, with small firms having significantly more countercyclical markups than large firms.
In chapter two, I examine if two prominent models in the literature are consistent with the empirical findings. First, I explore the Atkeson and Burstein (2008) model of oligopolistic competition. Coupled with an exogenous second-moment shock to firm productivities, this model results in a countercyclical average markup, but predicts that smaller firms reduce their markups in recessions. Second, I calibrate both Calvo and menu cost models of price stickiness to match the empirical
heterogeneity in price durations as in Goldberg and Hellerstein (2011). I find that both models can match the average counter-cyclicality of markups in response to monetary shocks. Quantitatively, however, only the menu cost model, through its selection effect, can match the extent of the empirical
heterogeneity in markup cyclicality. In addition, both sticky price models imply pro-cyclical markup behavior in response to productivity shocks.
In chapter three, I develop a new general equilibrium model that embeds customer capital into a standard firm dynamics model with entry and exit. A key feature of the model is that a firm's decision about markups becomes dynamic – firms accumulate customer capital in the periods of fast growth by charging low markups, and choose to exploit it by charging high markups in the downturns. In particular, during recessions, the endogenous higher exit probability for smaller firms implies that they place lower weight on future profits, leading them to charge higher markups. This mechanism serves to endogenously increase the dispersion of firm sales and employment in recessions. Also, the resulting input misallocation amplifies both the volatility and persistence of the exogenous productivity shocks driving the business cycle.
Advisors/Committee Members: Itskhoki, Oleg (advisor).
Subjects/Keywords: business cycle;
heterogeneity;
markup
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APA ·
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APA (6th Edition):
Hong, S. (2017). Cyclicality and Heterogeneity of Price Markup
. (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp01736667118
Chicago Manual of Style (16th Edition):
Hong, Sungki. “Cyclicality and Heterogeneity of Price Markup
.” 2017. Doctoral Dissertation, Princeton University. Accessed March 02, 2021.
http://arks.princeton.edu/ark:/88435/dsp01736667118.
MLA Handbook (7th Edition):
Hong, Sungki. “Cyclicality and Heterogeneity of Price Markup
.” 2017. Web. 02 Mar 2021.
Vancouver:
Hong S. Cyclicality and Heterogeneity of Price Markup
. [Internet] [Doctoral dissertation]. Princeton University; 2017. [cited 2021 Mar 02].
Available from: http://arks.princeton.edu/ark:/88435/dsp01736667118.
Council of Science Editors:
Hong S. Cyclicality and Heterogeneity of Price Markup
. [Doctoral Dissertation]. Princeton University; 2017. Available from: http://arks.princeton.edu/ark:/88435/dsp01736667118
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Open Access Theses and Dissertations
