Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 105 for “"age structure"”.
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Age-structure And Unemployment: Some Consequences Of The Post-war Baby Boom
… would now fall within an unemployment-prone age-category, and (ii) in the absence of sufficient wage flexibility, a shift in the supply curve of a particular type of labour (defined by age) would generate unemployment in that age-group (this is the so-called cohort-crowding hypothesis). …
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Regional variations in the age structure of the United States: 1870-1970
1 PDF file (vii, 190 pages)
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GROUND BEETLES (COLEOPTERA: CARABIDAE) AS BIODIVERSITY INDICATORS FOR AGE STRUCTURE IN PIEDMONT FORESTS?
… wing state of Carabidae as a function of forest age and identified eighteen species as potential ecological indicators for forest age. Ground beetles (Coleoptera: Carabidae) are typically ground-dwelling, generalist predators. Carabids were collected monthly through pitfall traps from March 2009 …
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Dynamics of Competition using a Bit String Model with Age Structure and Mutations
Using Monte Carlo simulations and analytic methods, we examine the dynamics of inter-species competition using the Penna bit-string model. We begin with a study of the steady state with a single species, then proceed to the dynamics of competition between two species. When the species are not …
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Heuristic rules to achieve pavement performance profile objectives
Most highway agencies adopt either a preventive or corrective maintenance strategy for pavement maintenance programming. Preventive maintenance is carried out when the segment distress value is below their respective warning level for defects whereas corrective maintenance is done when the segment …
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Modelling dominance shifts of anchovy and sardine with a frame-based approach : sensitivity to the underlying sardine population dynamics
… contains a sardine population sub-model without age structure and the inclusion of age-structure allows age-related dynamics to be incorporated in the model design. In this mini-dissertation, an age-structured sardine population is implemented in the frame based model by using the sardine …
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Probabilistic Models for Human Migration Forecasting and Residency Imputation
… framework to forecast migration flows by age and sex, providing the first probabilistic forecasts of international bilateral migration flows through 2045. Next, I address the influence of age structure on much longer-term migration forecasts by introducing the Migration Age Structure Index …
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Characterizing African Elephant (<i>Loxodonta Africana</i>) Population Dynamics and Distribution in Botswana
… and density of elephants in Africa. Elephant management in this country remains challenging and complex as the population estimates and trends calculated by government and independent researchers (from aerial survey data) differ and continue to be highly debated, both locally and internationally. …
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Effects of cannibalism, maternal age and varying fish selectivity in age structured models of deep water hake populations
An Age Structured Model (ASM) was develop in which dynamic and density-dependent cannibalism was included as a top-down control on a modeled population of M. paradoxus which used spawner biomass and maternal based recruitment. The ASM was used to evaluate the effects cannibalism had on age …
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Forest Dynamics Of Two Multi-Aged Hemlock-Mixed Mesophytic Forests In The Northern Cumberland Plateau, Kentucky
… composition, T. canadensis crown health, stand structure, age structure, and disturbance history. Rock Creek Research Natural Area (RCRNA) is a multi-aged primary forest while the Cold Hill Area (CHA) is a multi-aged mature secondary forest. Age structure and recruitment patterns at the RCRNA …
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A risk and reliability management appraisal of company failure. An application of risk and reliability managment methodology to the analysis and identification of pattern, causes and symptoms of company failure, including formation of a Data Bank for failed companies.
… of failure could be determined to enable management and other interested parties to identify the risks threatening the survival of the company. The current research divides into three main areas 1. Development of a Data Bank and a study of the age structure of failed companies. 2. An …
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Using selected acaricides to manipulate Tetranychus urticae Koch populations in order to enhance biological control provided by phytoseiid mites
… to introduce predatory phytoseiid mites to manage twospotted spider mites and reduce their need for acaricide applications (Sabelis, 1981). The predatory mite Phytoseiulus persimilis Athias-Henriot has been used successfully in integrated pest management programs for T. urticae suppression. …
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The Effects of Demographic Change and the Present Challenges for Human Resource Management in German Local Authorities in Relation to Workforce Planning to Facilitate the Management of Knowledge
… how demographic change is affecting HR management and managing knowledge as one key element of HRM in German public administration. The important questions are whether current working methods are suitable for the changed situation, whether these methods can be improved through new strategic …
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The Economics of Marriage and Divorce in Iran
… of four chapters on the economics of marriage and divorce in Iran. The first chapter outlines major forces driving the recent transitions in Iran's marriage market. Age structure of the population, the rise of women's education, marriage and divorce laws, and fertility decline are the four …
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Reproduction And Survivorship Of Two Species Of Daphnidae
… increase, obtained by iteration to a stable age structure, for S. kingi and S. serrulatus, respectively, were -0.012 and 0.030 at 10°C, and 0.052 and 0.078 at 15°C, 0.070 and 0.180 at 20°C, and 0.179 and 0.147 at 25°C.
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Mathematical demography of the Cape vulture
… stability of the population in space, time and age-structure?
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Kontraurbanizace v Karlovarském kraji v letech 2007-2021
… also includes an examination of the demographic structure of counterurban migrants. Keywords: counterurbanization, countryside, in-migration, Karlovy Vary Region, age structure
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Determinants of the structural niches of columnar cacti in the Southwest
… environment, or simply differences in population age structure. Populations of Carnegiea running east to west across southern Arizona differ primarily in size structure, not in growth form. Where growth form differences do exist, they are correlated with variation in aridity. Carnegiea and …
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Validation of Age Estimates and Comparisons of Growth Rates of the White Sucker, Catostomus Commersoni, in Three Southwest Missouri Populations
… plane, and polished in preparation for age estimation. Ageing validation was by marginal increment analysis whereby progression of annulus formation is plotted throughout the year at the otolith's growing edge. After validation, ages were determined by counting the annuli (opaque zones) …
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