Made available in DSpace on 2014-06-11T19:32:10Z (GMT). No. of bitstreams: 0 Previous issue date: 2013-02-26Bitstream added on 2014-06-13T20:27:16Z : No. of bitstreams: 1 silva_ley_dr_ift.pdf: 4929051 bytes, checksum: ca9589a1164e8d2361903c516c6ac865 (MD5) / Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) / Nesta tese estudamos conceitos básicos de um condensado de Bose-Einstein (BEC) e sua extensão para sistemas com propriedades mais exóticas, incluindo misturas de dois componentes, com algumas características interessantes encontradas devido à interação entre espécies, e condensados de átomos com forte momento (magnético) dipolar, nos quais a interação dipolo-dipolo (anisotrópica e de longo-alcance), abre novas possibilidades de pesquisa na procura por desconhecidas e fascinantes características para gases atômicos ultra-frios. Mostramos o modelo de campo-médio para misturas de dois BECs interagindo através do potencial de contato e da interação dipolar de longo-alcance empregando termos não lineares de inter e intra-espécies. Aplicamos este modelo em sistemas binários com diferentes armadilhas em que um deles ou ambos podem ser dipolares. Especificamente, estudamos as características físicas de uma mistura de dois BECs - com e sem interação dipolar -, a formação (e dinâmica) de bright solitons para um BEC dipolar, algumas propriedades interessantes para um BEC dipolar no limite de interação forte, e as características de um BEC dipolar quase-livre vinculado à um outro BEC não dipolar confinado numa armadilha magnética. Apresentamos nossos resultados numéricos usando gráficos de densidade, diagramas de fase, de formação de estruturas nas densidades ou a dinâmica dos sistemas, entre outros. Sempre que possível, nossos resultados serão associados com quantidades usadas em técnicas experimentais através de um tipo específico de átomo, o número de partículas, os valores dos parâmetros de interação, a anisotropia da armadilha ou outras quantidades relacionadas com observáveis experimentais / We described the basic ideas of Bose-Einstein condensation (BEC), and then we focused our study on extensions to more exotic condensates including mixtures of two components, where interesting characteristics are found due to the interspecies interaction, and magnetic dipolar gases, which with their ansiotropic long-range dipolar interaction have opened up new avenues of research into cold atoms, in a quest for novel and fascinating features. In this thesis, we present the mean-field model for the binary BEC interacting two-componente mixtures of dipolar and nondipolar BECs, the formation and dynamics of bright solitons, the strong coupling domain for dipolar BECS, and the features of an untrapped bound dipolar droplet in a trapped nondipolar condensate. Our numerical results are presented in density plots, stability, phase plots, structure formartion in densities, breathing oscillation, and more. However, these solutions, whenever possible, are associated with quantities widely handled in experimental techniques, theough a specific types of atoms, number of particles, values of parameters of interaction or the anisotropy of trap, and others quantities related to experimental observables

Tese (doutorado)—Universidade de Brasília, Instituto de Física, 2015. / Submitted by Kathryn Cardim Araujo (kathryn.cardim@gmail.com) on 2016-04-27T16:30:59Z No. of bitstreams: 1 2015_PauloMagalhãesMarcianoDaRocha.pdf: 595260 bytes, checksum: d0dd827f80029b5f52a2d26e668d2b5c (MD5) / Approved for entry into archive by Guimaraes Jacqueline(jacqueline.guimaraes@bce.unb.br) on 2016-04-28T13:07:36Z (GMT) No. of bitstreams: 1 2015_PauloMagalhãesMarcianoDaRocha.pdf: 595260 bytes, checksum: d0dd827f80029b5f52a2d26e668d2b5c (MD5) / Made available in DSpace on 2016-04-28T13:07:36Z (GMT). No. of bitstreams: 1 2015_PauloMagalhãesMarcianoDaRocha.pdf: 595260 bytes, checksum: d0dd827f80029b5f52a2d26e668d2b5c (MD5) / Nesta tese são discutidos dois aspectos do modelo de Gross-Neveu através da óptica de Simetria: Soluções analíticas são encontradas através da análise sistemática de simetrias das equações geradas pelo modelo e transição de fase é estudada a partir da restauração da simetria quiral por meio de efeitos de compactificação. / Within this thesis, two aspects of the Gross-Neveu model are considered in the backdrop of symmetry analysis: Analytical solutions of the model are obtained through systematic symmetry analysis of the differential equations of the model and phase transistion is studied from the point of view of the chiral symmetry restoration through compactification effects.

Orientador: Sadhan Kumar Adhikari / Banca: Arnaldo Gammal / Banca: Dionisio Bazeia Filho / Banca: Roberto André Kraenkel / Banca: Valery Shchesnovich / Resumo: Nesta tese estudamos conceitos básicos de um condensado de Bose-Einstein (BEC) e sua extensão para sistemas com propriedades mais "exóticas", incluindo misturas de dois componentes, com algumas características interessantes encontradas devido à interação entre espécies, e condensados de átomos com forte momento (magnético) dipolar, nos quais a interação dipolo-dipolo (anisotrópica e de longo-alcance), abre novas possibilidades de pesquisa na procura por desconhecidas e fascinantes características para gases atômicos ultra-frios. Mostramos o modelo de campo-médio para misturas de dois BECs interagindo através do potencial de contato e da interação dipolar de longo-alcance empregando termos não lineares de inter e intra-espécies. Aplicamos este modelo em sistemas binários com diferentes armadilhas em que um deles ou ambos podem ser dipolares. Especificamente, estudamos as características físicas de uma mistura de dois BECs - com e sem interação dipolar -, a formação (e dinâmica) de bright solitons para um BEC dipolar, algumas propriedades interessantes para um BEC dipolar no limite de interação forte, e as características de um BEC dipolar quase-livre vinculado à um outro BEC não dipolar confinado numa armadilha magnética. Apresentamos nossos resultados numéricos usando gráficos de densidade, diagramas de fase, de formação de estruturas nas densidades ou a dinâmica dos sistemas, entre outros. Sempre que possível, nossos resultados serão associados com quantidades usadas em técnicas experimentais através de um tipo específico de átomo, o número de partículas, os valores dos parâmetros de interação, a anisotropia da armadilha ou outras quantidades relacionadas com observáveis experimentais / Abstract: We described the basic ideas of Bose-Einstein condensation (BEC), and then we focused our study on extensions to more exotic condensates including mixtures of two components, where interesting characteristics are found due to the interspecies interaction, and magnetic dipolar gases, which with their ansiotropic long-range dipolar interaction have opened up new avenues of research into cold atoms, in a quest for novel and fascinating features. In this thesis, we present the mean-field model for the binary BEC interacting two-componente mixtures of dipolar and nondipolar BECs, the formation and dynamics of bright solitons, the strong coupling domain for dipolar BECS, and the features of an untrapped bound dipolar droplet in a trapped nondipolar condensate. Our numerical results are presented in density plots, stability, phase plots, structure formartion in densities, breathing oscillation, and more. However, these solutions, whenever possible, are associated with quantities widely handled in experimental techniques, theough a specific types of atoms, number of particles, values of parameters of interaction or the anisotropy of trap, and others quantities related to experimental observables / Doutor

Doctorat en sciences sociales, politiques et économiques / info:eu-repo/semantics/nonPublished

Magister Economicae - MEcon / Private investment in Botswana as well as a ratio to Gross Domestic Product has been falling in some periods of 1976-2003. Viewed against the background of growing evidence of a link between investment and economic growth, an inconsistent and downward trend in Botswana's private investment is a matter of concern. Several studies in developing countries emphasize the importance of macroeconomic policy in explaining variations in investment, an in particular, identify the microeconomic determinants of private investment to include interest rates, output growth, public investment, bank credit to the private sector, inflation, real exchange rate, and the level of trade. This study evaluated the macroeconomic determinants of private investment in Botswana by means of a regression analysis based on the co-integration and Error Correction Model of Engle and Granger (1987). / South Africa

Magister Legum - LLM

This paper is focused on economic development of the People's Republic of China during the last decade. The aim of this paper is to analyse the economic transformation and identify key factors holding back the economic growth. In the theoretical part of this paper there will be a short introduction of China. Some Chinese social and economic specifics will also be explained. The end of this chapter will be focused on historical economic reforms and current goals for the economy. Next chapter will be focused on analysis of the economy in the last decade using the official available data. In the conclusion of this paper there will be presented findings and key factors holding back the economic growth of China.

Competitiveness has been part of central, monetary policy making for over 500 years where regions have aimed to improve competitiveness and productivity by focussing on specific factors. The focus of the research was to identify which factors are most relevant for the African continent on determining competitiveness which will allow policy makers to understand how best to direct their investment with the greatest productivity return. The research methodology was quantitative in nature, based on secondary data from the Global Competitiveness Report over the past five years. The sample included 39 of the 54 African countries which are the countries on which the report collected data from. The unit of analysis was GDP per capita. A multivariate Generalised Linear Model with a log link function and Gamma error structure was built. The results showed that the order of importance for Africa was macroeconomic stability; infrastructure; technological readiness; and market size with the other factors not having a material influence. Building a similar model on all the countries have included two additional factors namely health and primary education as well as higher education and training. This indicates that certain structural factors are more important for countries in the developing phase such as Africa. / Dissertation (MBA)--University of Pretoria, 2014. / lmgibs2015 / Gordon Institute of Business Science (GIBS) / MBA / Unrestricted

Philosophiae Doctor - PhD / Savings is essential for boosting economic growth. Low savings in a country will have negative consequences for both investment and economic growth. South Africa has continued to expe rience declining saving rates and in recent years, accompanied by declining economic growth. The study evaluated savings in South Africa by decomposing it into household saving, cor porate saving and public saving. The focus was to investigate the determinants of household savings, corporate and public savings. In addition to examining the determinants of savings, the research has also analysed the saving-investment relationship for South Africa. The study used a Bayesian vector auto regressive model to investigate the determinants of household sav ing from 1980Q1 to 2017Q4. The results of the investigation on household saving showed that GDP, inflation rate, and financial deepening determine household saving in South Africa. The Bayesian VAR was also used to identify the determinant of budget deficit between 1980Q1 to 2017Q and found Real GDP, inflation rate, total government debt, investment by general government and the inflation rate to be determinants. The Blundel-Bond Generalized Method of Moment (GMM) was used to investigate the determinants of corporate saving in form of cash holding for 80 non-financial firms listed on the JSE between 2007 and 2017. The results showed leverage, cash flow, debt maturity and previous amounts of cash holding to have significant effect on cash holding in SA. Lastly, the study examined the saving-investment nexus for South Africa using yearly data from 1980 to 2016. Using the Autoregressive Distributed lag (ARDL) and the Error Correction Model, (ECM), the study found a cointegrating relationship between domestic saving and domestic investment. It further found a positive relationship between domestic saving and domestic investment in both the short and long run. Causality analysis showed a unidirectional causality from domestic saving to domestic investment.

It was the purpose of this present study to investigate the effects of two types of music, tonic and sedative, on the gross motor activity of profound mental retardates. The primary objective was to determine if therapeutic benefits resulting from the application of music could be extended to profound retardates as has already been demonstrated with other levels of retardation.