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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
71

Modeling blood vessels and oxygen diffusion into brain tissue

Caldwell, Mark Alexander January 2019 (has links)
No description available.
72

Spatial distribution of artifacts and site formation at the Lower Town of Mycenae

Shears, Ryan Patrick 04 May 2018 (has links)
The “Lower Town” archaeological site in Mycenae, Argolis, Greece has been excavated since 2007 and multiple periods of occupation and abandonment are represented in the stratigraphy uncovered. Sedimentary deposits were grouped into two general categories during excavation and these categories shaped fieldwork decisions: yellow-orange sediment with denser artifact concentrations representing potential occupation and red sediment with sparser artifacts representing abandonment. The distributions of point locations of artifacts within these bodies of sediment are analyzed statistically for spatial homogeneity using Ripley’s K in a GIS environment to test these site formation assumptions. Statistically significant spatial clustering in artifacts is assumed for autochthonous occupation deposits. These analyses were designed to be used to explicitly test otherwise implicit assumptions during fieldwork in future fieldwork. Results are mixed, with several factors complicating the interpretation of results without the hindsight of postieldwork artifactual and geoarchaeological analyses.
73

K-Sample Analogues of the Kolmogorov-Smirnov Statistics and Binomial Group Tests

Zing, Lucille Lu Kow 05 1900 (has links)
<p> The Kolmogorov-Smirnov tests of homogeneity or goodness-of-fit and the binomial group tests for eliminating defectives are of different nature. But they are both popular in applications. The former are widely used in nonparametric comparison, while the later are usually adopted in the group screening problems. When the experimenter has k populations, k-sample statistics should be considered for the testing of homogeneity or goodness-of-fit. On the other hand, when there are k experimenters available for performing group testing on a given population, a k-sample group testing procedure should be used.</p> <p> In this thesis, the distribution functions of k-sample analogues of the Kolmogorov-Smirnov statistics have been found under certain conditions and a k-sample group testing procedure has been defined. This procedure has also been shown to be optimal in the sense that it requires a minimum expected number of k-sample group tests for finding a single defective from a binomial population.</p> <p> Our methods are mainly combinatorial: matrix enumeration, tree counting and construction algorithms are explored as a foundation of our study.</p> / Thesis / Doctor of Philosophy (PhD)
74

Fem kvinnor som krossat glastaket : Styrkor och utmaningar i en kvinnlig ledningsgrupp

Andersson, Lina January 2023 (has links)
This study aims to explore strengths and challenges in an all-female executive team. The subject of female executive teams is relatively unexplored, why the study contributes with a new perspective on the dynamics and processes occurring in an all-female executive team. 45-minute interviews were conducted with each member of the group, which consists of five women between the age of 50 and 61. Together they constitute an executive team in a Swedish organization. A thematic analysis was conducted and four themes were identified, as follows: openness, respect, inefficient processes and homogeneity. In general, the group is perceived to be well-functioning, and they consistently emphasize positive qualities within their group. Among other things, they talk about an open climate, absence of prestige and express care for each other. To some extent, the group is homogeneous. This makes them at risk of groupthink and missing perspectives, although there is no indication in the interviews that this is occurring. They do however express a lack of time and strategic work, deficiencies in structure and to some extent a too large need for control. The study’s findings are discussed in relation to previous research on power structures, gender studies and group development. At last, suggestions are given for further studies to explore whether it is the gender composition or the women's personalities that make the group so well-functioning.
75

Změny srážko-odtokového režimu v oblasti Šumavy / Changes of rainfall-runoff regime in the Šumava/Bohemian Forest region

Fiala, Ondřej January 2017 (has links)
CHANGES OF RAINFALL-RUNOFF REGIME IN THE ŠUMAVA / BOHEMIAN FOREST REGION Abstract: The goal of this thesis is the evaluation of changes in rainfall-runoff regime in the Šumava region from time and spacial point of view. The thesis includes research and applied part. The research part is dedicated to the methods of evaluation of runoff changes and their possible causes in the Šumava region. In the applied part there is an analysis of precipitaion - runoff regime for long-term time series of average annual and monthly discharges and also annual and monthly precipitations for selected gauging stations in Czech, German and Austrian part of Šumava using absolute and relative homogenity tests and Mann - Kendall test for long-term trend. The results of this thesis showed significant changes in rainfall and runoff seasonality. One of the main aims of this thesis is the identification of possible orographical effect or the difference between windward and leeward part of Šumava. In conclusion the achieved results are evaluated, discussed and compared with subject publications. Key words: absolute homogeneity, land-use, Mann - Kendall test, runoff, basin, discharge, relative homogeneity, season,precipitation, trend, Šumava
76

Development in Normal Mixture and Mixture of Experts Modeling

Qi, Meng 01 January 2016 (has links)
In this dissertation, first we consider the problem of testing homogeneity and order in a contaminated normal model, when the data is correlated under some known covariance structure. To address this problem, we developed a moment based homogeneity and order test, and design weights for test statistics to increase power for homogeneity test. We applied our test to microarray about Down’s syndrome. This dissertation also studies a singular Bayesian information criterion (sBIC) for a bivariate hierarchical mixture model with varying weights, and develops a new data dependent information criterion (sFLIC).We apply our model and criteria to birth- weight and gestational age data for the same model, whose purposes are to select model complexity from data.
77

A qualitative evaluation of self-motivation in a measure of Trait Emotional Intelligence

Rossouw, Pieter Johannes 02 1900 (has links)
In this study, the author provided a discussion of international cross-cultural validation studies which reported low internal consistency reliabilities for the self-motivation facet of the Trait Emotional Intelligence Questionnaire (TEIQue). A review of salient models of emotional intelligence (EI) revealed that self-motivation was consistently conceptualised as part of the sampling domain of trait and mixed models of EI, but not ability-based conceptualisations of the construct. The author provided a qualitative evaluation of the ten self-motivation test items as they appeared in the TEIQue with the purpose of exploring the operationalisation of the construct in a multi-cultural South African sample. The exploratory-descriptive research was conducted amongst permanent employees who have all completed the TEIQue as part of on-going employee assessments. The present study found limited support for a satisfactory operationalisation of the self-motivation facet of the TEIQue as it related to a multi-cultural South African research sample. / Psychology / M.A. (Psychology)
78

An Experimental Study of Liquid Steel Sampling

Ericsson, Ola January 2009 (has links)
<p>Sampling of liquid steel to control the steel making process is very important in the steel industry. However, there are numerous types of disposable samplers and no united standard for sampling. The goal in this study is to investigate the effect of slag protection type and sample geometry on sampling parameters and sample homogeneity. Three sample geometries were selected: i) Björneborg ii) Lollipop with a 6 mm thickness and iii) Lollipop with a 12 mm thickness. These sample geometries have been tested with two types of slag protection: metal-cap-protection and argon-protection. The filling velocity and solidification rate of steel samples have been experimentally measured during plant trials. The sample homogeneity with respect to total oxygen content and inclusion size distribution has been determined in different parts of the samples. The study shows that argon-protected samplers have lower, more even, filling velocities (0.19±0.09 m/s) compared to metal-cap-protected samplers (1.28±2.23 m/s). The solidification rate measurements of the different samplers show that the 6 mm thick Lollipop has the highest solidification rate (99~105 °C/s).  Measurements of total oxygen content in argon-protected samples showed little variation between different zones of the samples. However, metal-cap-protected samples contained much higher total oxygen contents. Light optical microscope studies showed that the increase in total oxygen content was probably caused by entrapment of top slag during sampling. Furthermore, it was found that the contamination of top slag in the metal samples increased with a decreased sample weight. Determination of inclusion size distribution in argon-protected Lollipop samples showed that a larger number of primary inclusions are found in the top part compared to the middle and the bottom part of the samples.</p><p> </p>
79

Within-Group Agreement in Perceptions of the Work Environment: Its Antecedents

Ford, Lucy R. 01 January 2003 (has links)
There is an increasing interest in within-group agreement in organizations, in response to evidence that agreement is predictive of various outcomes of interest. The model in this study suggests that within-group agreement on perceptions of the work environment is predicted indirectly by the quality of exchange relationships, specifically team-member exchange (TMX), leader-member exchange (LMX), social interaction and work interdependence, through the mediation of social influence, and directly by demographic homogeneity. Chan's (1998) typology of composition models was used to appropriately conceptualize the variables at the group level.Results suggest that average high quality LMX relationships are predictive of within-group agreement, and that high quality relationships within the team are predictive of perceptions of social influence within the team. The mediation model was non-significant, and contrary to existing literature, social interaction and work interdependence were not significantly related to any of the other variables in the model.Demographic homogeneity was related to both perceptions of social influence and to within-group agreement on perceptions of the work environment in the opposite direction from that hypothesized. Post-hoc analyses suggest that organizational cultural orientation (collectivist or individualist) may moderate the relationship between demographic homogeneity and within-group agreement on perceptions of the work environment.
80

Populační vývoj zemí po demografické revoluci / Population Development of Countries after Demographic Revolution

Vítková, Lucie January 2011 (has links)
Lucie Vítková: Populační vývoj zemí po demografické revoluci Abstract The aim of the thesis is an analysis of main features of population development in developed countries and a question whether there is homogeneity of population development. Demographic revolution is a qualitative change from extensive to intensive character of demographic reproduction and it is a subject to modernization. Countries which are understood not only as demographically developed ones but also as economically developed has been taken as an object of this thesis. These countries finished demographic revolution at the latest in the middle of the 20th century. This period has been used as a starting point for most analysis which has been carried out. Demographic reproduction is a process determined by biological and social factors. Human reproduction takes place in relatively stable limits, which lead to its homogenization. The importance of social conditionality has grown during demographic revolution, social aspects are the cause of their development changes and specific features, same social conditions lead to homogenization. Presumption of different features of population development as consequence of different conditions in former Eastern and Western countries has been confirmed not only in individual main demographic indexes...

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