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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.
1

Análise numérica do carregamento de uma hélice em um modelo aerodinâmico / Numerical analysis of the propeller loading in an aerodynamic model

Brandt, João Henrique Piola 20 March 2000 (has links)
Devido a crescente necessidade da indústria aeronáutica de lançar novos modelos ou fazer melhorias em seus projetos, e a utilização mais freqüente da informática como ferramenta de trabalho nos departamentos de projetos e na integração com a produção, tem-se realizada a modificação dos softwares existentes com o intuito de atualizá-los ou torná-los mais abrangentes nos estudos de casos aeronáuticos, quando possível e viável, auxiliando com isto a diminuição de custos e a maximização da fase projeto/produção. Com esta finalidade, fez-se uma melhoria em um programa de métodos de painéis preexistente, utilizado para se fazer uma análise inicial de um projeto aeronáutico na indústria e, no caso de centros de ensinos e universidades, para a demonstração e aprendizagem de ferramentas de projetos, onde o carregamento axial da hélice foi acrescido de novos modelos. Para isso utilizou-se tanto carregamentos teóricos ou hipotéticos, através de curvas matemáticas conhecidas ou curvas polinomiais quaisquer, quanto carregamentos reais, obtidos de experimentações de diferentes hélices em testes de bancadas. Especificamente utilizou-se um modelo aeronáutico composto por um conjunto asa/fuselagem, com a hélice na posição \"pusher\", onde é mostrada a influência dos vários modelos de carregamento da hélice sobre o carregamento no perfil da asa. / Due to the increasing necessity of the aeronautical industry to launch new models or to make improvements in their projects, and the utilization more frequently of the computational programs as tools of work in the projects department and integration with production, has realised modifications have been made to in the existent softwares with the intuition of updating or to get close to the real situations in the study of aeronautical cases, when this is possible and viable, helping in the minimization of costs and the maximization of the project/prodution phase. With this aim, made improvements were made in a preexistent panel method, created for the initial analysis of an aeronautical project in the industry and, in the case of educational centers and the university, for the demonstration and the teaching of the use design tool, in which the axial loading on the propellers was increased, creating new models. For this as theoretical or hypotetical Ioading was used, through the use of known mathematical or polynomial curves, and real loading, obtained in experiments with different propellers static tests. Especifically an aeronautical model composed of a wing/fuselage, within a twin pusher propeller configuration, in which the influence of the several models of propeller loading on the wing section loading is shown.
2

Public, Private, and Informal Home Care in Canada: What are the Determinants of Utilization and the Interrelationship among Different Types of Services?

Mery, Gustavo 09 August 2013 (has links)
In Canada and internationally, increases in Home Care (HC) services for the elderly have been a policy priority in recent decades. HC services include Home Health Care (HHC) and Homemaking/Personal Support (HM). The primary objectives of this study were to explore the interrelationship among publicly funded, privately funded, and informal HC services in terms of potential for substitution, and between publicly funded HHC and HM services; and the determinants of the receipt of each type of HC services. Stabile, Laporte, and Coyte’s family home care decision model (2006) was extended, to develop an understanding of the demand for HHC and HM services separately and to include different household arrangements. The consequential hypotheses were tested in two empirical studies. Individual panel data for those aged 65 and over were derived from 8 biannual waves of the Canadian National Population Health Survey (1994-95 to 2008-09). A Panel Two-Stage Residual Inclusion method was used to estimate the likelihood of the receipt of HC services, adjusting for socio-demographic, health status, disability, dependence on help with Activities of Daily Living (ADLs), and regional characteristics. The results showed that receipt of publicly funded HM is complementary with receipt of publicly funded HHC services after adjusting for functional and health status. Receipt of publicly funded and privately funded HM services did not show an effect on each other. Receipt of publicly funded HM did not affect the receipt of informal HM services. The availability of informal care from a partner or other adult sharing the household reduced the likelihood of publicly funded HM receipt. Age, dependence on help with ADLs, health status and income are determinants of the propensity to receive publicly funded HHC and HM services as well as privately funded and informal HM. Findings in this study suggest that changes in the availability of publicly funded HC services may not greatly affect the provision of informal care in Canada. The complementary effect between publicly funded HHC and HM services and the income effect in the receipt of publicly and privately funded HC services may raise concerns about equitable access to HC services in Canadian jurisdictions.
3

Public, Private, and Informal Home Care in Canada: What are the Determinants of Utilization and the Interrelationship among Different Types of Services?

Mery, Gustavo 09 August 2013 (has links)
In Canada and internationally, increases in Home Care (HC) services for the elderly have been a policy priority in recent decades. HC services include Home Health Care (HHC) and Homemaking/Personal Support (HM). The primary objectives of this study were to explore the interrelationship among publicly funded, privately funded, and informal HC services in terms of potential for substitution, and between publicly funded HHC and HM services; and the determinants of the receipt of each type of HC services. Stabile, Laporte, and Coyte’s family home care decision model (2006) was extended, to develop an understanding of the demand for HHC and HM services separately and to include different household arrangements. The consequential hypotheses were tested in two empirical studies. Individual panel data for those aged 65 and over were derived from 8 biannual waves of the Canadian National Population Health Survey (1994-95 to 2008-09). A Panel Two-Stage Residual Inclusion method was used to estimate the likelihood of the receipt of HC services, adjusting for socio-demographic, health status, disability, dependence on help with Activities of Daily Living (ADLs), and regional characteristics. The results showed that receipt of publicly funded HM is complementary with receipt of publicly funded HHC services after adjusting for functional and health status. Receipt of publicly funded and privately funded HM services did not show an effect on each other. Receipt of publicly funded HM did not affect the receipt of informal HM services. The availability of informal care from a partner or other adult sharing the household reduced the likelihood of publicly funded HM receipt. Age, dependence on help with ADLs, health status and income are determinants of the propensity to receive publicly funded HHC and HM services as well as privately funded and informal HM. Findings in this study suggest that changes in the availability of publicly funded HC services may not greatly affect the provision of informal care in Canada. The complementary effect between publicly funded HHC and HM services and the income effect in the receipt of publicly and privately funded HC services may raise concerns about equitable access to HC services in Canadian jurisdictions.
4

Análise numérica do carregamento de uma hélice em um modelo aerodinâmico / Numerical analysis of the propeller loading in an aerodynamic model

João Henrique Piola Brandt 20 March 2000 (has links)
Devido a crescente necessidade da indústria aeronáutica de lançar novos modelos ou fazer melhorias em seus projetos, e a utilização mais freqüente da informática como ferramenta de trabalho nos departamentos de projetos e na integração com a produção, tem-se realizada a modificação dos softwares existentes com o intuito de atualizá-los ou torná-los mais abrangentes nos estudos de casos aeronáuticos, quando possível e viável, auxiliando com isto a diminuição de custos e a maximização da fase projeto/produção. Com esta finalidade, fez-se uma melhoria em um programa de métodos de painéis preexistente, utilizado para se fazer uma análise inicial de um projeto aeronáutico na indústria e, no caso de centros de ensinos e universidades, para a demonstração e aprendizagem de ferramentas de projetos, onde o carregamento axial da hélice foi acrescido de novos modelos. Para isso utilizou-se tanto carregamentos teóricos ou hipotéticos, através de curvas matemáticas conhecidas ou curvas polinomiais quaisquer, quanto carregamentos reais, obtidos de experimentações de diferentes hélices em testes de bancadas. Especificamente utilizou-se um modelo aeronáutico composto por um conjunto asa/fuselagem, com a hélice na posição \"pusher\", onde é mostrada a influência dos vários modelos de carregamento da hélice sobre o carregamento no perfil da asa. / Due to the increasing necessity of the aeronautical industry to launch new models or to make improvements in their projects, and the utilization more frequently of the computational programs as tools of work in the projects department and integration with production, has realised modifications have been made to in the existent softwares with the intuition of updating or to get close to the real situations in the study of aeronautical cases, when this is possible and viable, helping in the minimization of costs and the maximization of the project/prodution phase. With this aim, made improvements were made in a preexistent panel method, created for the initial analysis of an aeronautical project in the industry and, in the case of educational centers and the university, for the demonstration and the teaching of the use design tool, in which the axial loading on the propellers was increased, creating new models. For this as theoretical or hypotetical Ioading was used, through the use of known mathematical or polynomial curves, and real loading, obtained in experiments with different propellers static tests. Especifically an aeronautical model composed of a wing/fuselage, within a twin pusher propeller configuration, in which the influence of the several models of propeller loading on the wing section loading is shown.
5

Rapid Prediction of Low-Boom and Aerodynamic Performance of Supersonic Transport Aircraft Using Panel Methods

Giblette, Ted N. 01 December 2019 (has links)
The Utah State University Aerolab developed and tested a set of tools for rapid prediction of the loudness of a sonic boom generated by supersonic transport aircraft. This work supported a larger effort led by Texas A&M to investigate the use of adaptive aerostructures in lowering sonic boom loudness at off design conditions. Successful completion of this effort will improve the feasibility of supersonic commercial transport over land. Funding was provided by a NASA University Leadership Initiative grant to several universities, including Utah State University, as well as industry partners to complete this work over a five year period. The work presented in this thesis was done over the first year of the grant. The Aerolab team was specifically tasked with developing a set of tools for rapidly predicting the sonic boom loudness of supersonic aircraft. Specifically, this work included an assessment of the existing analysis tools available followed by the planning, development, and testing of a framework of tools for performing the needed calculations. Results of the framework were compared against high fidelity solutions available from the 2017 AIAA Sonic Boom Prediction Workshop. These comparisons revealed that panel methods perform well for simple geometries. However, localized errors appear when modeling more complex geometries that reduce the accuracy of the predicted sonic boom loudness. It was found that these localized errors were a consequence of the inherent assumptions built into panel methods. Consequently, in future work, it may be necessary to develop techniques for combining the results of panel methods with higher fidelity methods or to revisit the panel method formulation.
6

A Comparison of Euler Finite Volume and Supersonic Vortex Lattice Methods used during the Conceptual Design Phase of Supersonic Delta Wings

Guillermo-Monedero, Daniel 01 October 2020 (has links)
No description available.
7

Distribution matters: Meeting human needs at sustainable carbon consumption

Barbour, Felix January 2022 (has links)
To avoid irreversible damage to the climate system and biosphere, the majority of the world’s countries must reduce rates of resource throughput. However, the socio-economic conditions for satisfying basic human needs at low resource use have received scant empirical attention. I apply cross-country panel analysis and dynamic linear modelling to explore how different dimensions of inequality affect countries’ abilities to deliver a good life for all at sustainable levels of carbon consumption. My results suggest that inequalities reduce socio-ecological performance, with income inequality reducing the proportion of carbon channelled into meeting basic needs and wealth inequality increasing the carbon-intensity of expenditure. Overall, this study highlights the importance of reducing inequalities in a resource-constrained world. Social media summary. Income inequality raises the carbon cost of meeting basic human needs at the national and global scales.

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