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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.
61

Diet and the Dietary Niches of the Malagasy Subfossil Lemurs: An Analysis of Dental Microwear, Dental Proportions, and Grit Accumulation

Bender, Cristel 10 May 2017 (has links)
The purpose of this study is to identify the currently supported diet and dietary niches of the Malagasy subfossil and extant lemurs. The study was conducted partially in Tsinjoarivo and Antananarivo, Madagascar in the summer of 2013. Samples were analyzed and microwear determined that the dietary niches were aligned with current literature. Grit accumulation occurs more frequently in disturbed habitats and on lower canopy levels, which suggests that human manipulation of environment can impact the dental microwear of living primates.
62

Aplikace modelu SRM pro modelování akumulace a tání sněhu v experimentálních povodích Bystřice a Zlatého potoka v Krušných horách / Application of the Snowmelt Runoff Model for snow accumulation and snowmelt modelling in experimental catchments Bystřice and Zlatý Brook in the Krušné Mountains

Šedivá, Kateřina January 2013 (has links)
Title: Application of the Snowmelt Runoff Model for snow accumulation and snowmelt modelling in experimental catchments Bystřice and Zlatý Brook in the Krušné Mountains Modelling of hydrological processes is a dynamically developing part of hydrology. The Snowmelt Runoff Model (SRM) was applied for modelling the runoff in two experimental catchments Bystřice and Zlatý Brook. The aim of this thesis is to set up and calibrate SRM model and to evaluate methods and procedures used for runoff simulations. The SRM model was used for modelling snow accumulation and snowmelt in two selected catchments in the Krušné Mountains. The snow depths and snow water equivalents are measured since 2009 at selected locations situated in catchments. Calibration and validation of the model was based on continual time series of precipitation, air temperature and discharge measured 2009. Hydrological years 2009 and 2010 were used for model calibration and hydrological years 2011 and 2012 were used for model validation. Sensitivity analysis, which quantifies the effect of individual model parameters on the simulating proces, was carried out based on results. Recession coefficient and runoff coefficient belong to the most sensitive parameters with highest impact on runoff simulations. Model calibration was successful, which...
63

The Strandpoint of the proletariat

Giusti, Giorgio January 2012 (has links)
No description available.
64

Determinação do teor médio e da incerteza em depósitos fosfáticos estratiformes no sul do Estado do Mato Grosso / Determination of mean grade and uncertainty in stratiform phosphatic deposits in southern Mato Grosso State

Rampazzo, Guilherme José 17 November 2017 (has links)
A avaliação de recursos minerais em depósitos estratiformes que possuem dimensões horizon-tais relativamente muito maiores que na direção vertical pode acarretar em algumas dificulda-des durante os procedimentos de interpolação e estimativas, podendo inclusive necessitar da utilização de sub-blocos. Tal fato pode ser ainda mais agravado se na geometria do depósito ocorrer regiões com grande variabilidade de espessura, falhas ou dobramentos, fazendo com que eventos deposicionais de idades diferentes sejam postos muito próximos e que, conse-quentemente, esses dados sejam correlacionados durante as estimativas de pontos não amos-trados. Uma maneira de se minimizar esse efeito em depósitos minerais de grandes extensões e relativa pequena espessura é utilizando métodos indiretos de avaliação através de variáveis de serviço, como a Acumulação (Acc) e a Espessura Mineralizada (T), onde o Teor Médio (G) é obtido pela razão destas variáveis (Acc/T). Entretanto, uma lacuna matemática é identi-ficada quando Dowd & Milton (1987) afirmam que esta razão se trata somente de uma apro-ximação, pois não leva em consideração as incertezas associadas às variáveis de serviço, e Journel & Huijbregts (1978) quando demonstram a dificuldade em se calcular a incerteza lo-cal associada a uma razão de duas variáveis. Yamamoto et al. (2017) ao identificarem essa lacuna desenvolveram equações capazes de se calcular em valores provenientes da razão de duas variáveis considerando suas incertezas, que neste caso se trata do teor médio dos blocos estimados, além da variância ou incerteza local associada às estimativas, aplicando o fator esperança matemática à função ( ) , e expandindo-a até segunda ordem pela Série de Taylor. Os objetivos propostos por esta Dissertação foram fundamentados nestas lacunas matemáticas e no teste desta nova metodologia de avaliação indireta de depósitos minerais estratiformes utilizando pioneiramente dados reais provenientes de um projeto de pesquisa em fosfato de titularidade da BEMISA - Brasil Exploração Mineral S.A. no Estado do Mato Gro-so. Para o desenvolvimento deste trabalho utilizaram das diversas ferramentas estatísticas e geoestatísticas, a partir das quais foi possível comtemplar recursos fosfáticos de aproximada-mente sete milhões de toneladas a um teor médio de 3,21% de P2O5, considerando um teor de corte 1,8%. / The evaluation of mineral resources in stratiform deposits that have horizontal dimensions much larger than vertical dimension can lead to some difficulties during interpolation and estimations procedures, and may even require the use of sub-blocks. This fact can be further aggravated if regions of great variability of thickness, thrusts or folding occur in the deposi-tion geometry, causing depositional events of different ages to be placed very close and con-sequently, these data are correlated during the estimates of not sampled points. One way to minimize this effect in mineral deposits with relatively small thickness is using indirect meth-ods of evaluation through service variables, such as Accumulation (Acc) and Mineralized Thickness (T), where the Average (G) is obtained by the ratio of these variables (Acc / T). However, a mathematical gap is identified when Dowd & Milton (1987) argue that this ratio is only an approximation because it doesn\'t take into account the uncertainties associated at with service variables, and Journel & Huijbregts (1978) when they demonstrate the difficulty in calculate the local uncertainty associated with two-variable ratio. When Yamamoto et al. (2017) identified this gap, they developed equations capable of calculating values from the ratio of two variables considering their uncertainties, which in this case is the average of esti-mated blocks, in addition to the local variance or uncertainty associated with the estimates, applying the Mathematical Expectation factor to the function f (x, y) = X / Y, and expanding it to second order by the Taylor Series. The objectives proposed by this Dissertation were based on these mathematical gaps and the test of this new methodology of indirect evaluation of stratiform mineral deposits using a real data from a phosphate research project owned by BEMISA - Brasil Exploração Mineral SA in the State of Mato Grosso. For the development of this work, a number of statistical and geostatistical tools were used, in which it was possi-ble to contemplate phosphatic deposits of approximately 7 million tons at an average 3.21% P2O5 content, considering a cut-off of 1,8%.
65

Estado, espaço e acumulação na crise contemporânea / State, space and accumulation in the contemporany crisis

Cruz, Murilo Medici Navarro da 11 September 2006 (has links)
Este trabalho parte de uma questão posta pela realidade atual: a crise econômica mundial, percebida principalmente no que vem se denominando de financeirização da economia e, conjuntamente a esta crise, aquela do Estado nacional, ambas vistas na perspetiva mundial e, igualmente, na brasileira. Não há, no entanto, o objetivo aqui de se fazer um tratamento histórico ou puramente econômico do problema. Ao invés disso, o que se verá está mais próximo de um exercício teórico e analítico. Este se constitui, em primeiro lugar, de uma discussão aprofundada sobre os fundamentos da economia capitalista que, segundo se entende, são também os fundamentos da crise econômica atual. Em segundo lugar, para se refletir tanto sobre a crise econômica como sobre a política fazse uma reflexão sobre a produção do espaço e o papel do Estado no conjunto da sociedade capitalista. Em terceiro lugar, a conjunção entre o Estado e o capital se mostra identificável na análise do território nacional e seus fundamentos. Por último, o problema da crise atual é posto por meio de uma crítica à idéia de desterritorialização, crítica esta que leva à formulação da hipótese de uma territorialização abstrata, que seria característica da própria crise. / This work starts from a matter put by the current reality: The world economic crisis, specially seem on what has been denominated \"money predomination economy\" and, along with the crisis, the one of national State, both seen under the world\'s perspective and, equally, the Brazilian perspective. Nevertheless, this work does not intend, herein, to give a historical or purely economic treatment of the problem. Instead, what you will see is closer to an analytical and theoretical exercise. This work constitutes, firstly, of a deep discussion about the basis of capital economy which, according to what is understood, also are the basis of the current economic crisis. Secondly, to reflect about the economic crisis as much as politics, is necessary to reflect about the production of space and the State\'s role within the capitalist society. And thirdly, the union between the State and the capital shows itself identifiable on the national territory analysis along with your basis. Last but not least, the current crisis problem is put through a criticism to the lack of focusing the capital on a specific market, criticism that takes us to formulate the hypothesis of an abstract investment of capital, which would be a characteristic of the crisis itself.
66

Determinação do teor médio e da incerteza em depósitos fosfáticos estratiformes no sul do Estado do Mato Grosso / Determination of mean grade and uncertainty in stratiform phosphatic deposits in southern Mato Grosso State

Guilherme José Rampazzo 17 November 2017 (has links)
A avaliação de recursos minerais em depósitos estratiformes que possuem dimensões horizon-tais relativamente muito maiores que na direção vertical pode acarretar em algumas dificulda-des durante os procedimentos de interpolação e estimativas, podendo inclusive necessitar da utilização de sub-blocos. Tal fato pode ser ainda mais agravado se na geometria do depósito ocorrer regiões com grande variabilidade de espessura, falhas ou dobramentos, fazendo com que eventos deposicionais de idades diferentes sejam postos muito próximos e que, conse-quentemente, esses dados sejam correlacionados durante as estimativas de pontos não amos-trados. Uma maneira de se minimizar esse efeito em depósitos minerais de grandes extensões e relativa pequena espessura é utilizando métodos indiretos de avaliação através de variáveis de serviço, como a Acumulação (Acc) e a Espessura Mineralizada (T), onde o Teor Médio (G) é obtido pela razão destas variáveis (Acc/T). Entretanto, uma lacuna matemática é identi-ficada quando Dowd & Milton (1987) afirmam que esta razão se trata somente de uma apro-ximação, pois não leva em consideração as incertezas associadas às variáveis de serviço, e Journel & Huijbregts (1978) quando demonstram a dificuldade em se calcular a incerteza lo-cal associada a uma razão de duas variáveis. Yamamoto et al. (2017) ao identificarem essa lacuna desenvolveram equações capazes de se calcular em valores provenientes da razão de duas variáveis considerando suas incertezas, que neste caso se trata do teor médio dos blocos estimados, além da variância ou incerteza local associada às estimativas, aplicando o fator esperança matemática à função ( ) , e expandindo-a até segunda ordem pela Série de Taylor. Os objetivos propostos por esta Dissertação foram fundamentados nestas lacunas matemáticas e no teste desta nova metodologia de avaliação indireta de depósitos minerais estratiformes utilizando pioneiramente dados reais provenientes de um projeto de pesquisa em fosfato de titularidade da BEMISA - Brasil Exploração Mineral S.A. no Estado do Mato Gro-so. Para o desenvolvimento deste trabalho utilizaram das diversas ferramentas estatísticas e geoestatísticas, a partir das quais foi possível comtemplar recursos fosfáticos de aproximada-mente sete milhões de toneladas a um teor médio de 3,21% de P2O5, considerando um teor de corte 1,8%. / The evaluation of mineral resources in stratiform deposits that have horizontal dimensions much larger than vertical dimension can lead to some difficulties during interpolation and estimations procedures, and may even require the use of sub-blocks. This fact can be further aggravated if regions of great variability of thickness, thrusts or folding occur in the deposi-tion geometry, causing depositional events of different ages to be placed very close and con-sequently, these data are correlated during the estimates of not sampled points. One way to minimize this effect in mineral deposits with relatively small thickness is using indirect meth-ods of evaluation through service variables, such as Accumulation (Acc) and Mineralized Thickness (T), where the Average (G) is obtained by the ratio of these variables (Acc / T). However, a mathematical gap is identified when Dowd & Milton (1987) argue that this ratio is only an approximation because it doesn\'t take into account the uncertainties associated at with service variables, and Journel & Huijbregts (1978) when they demonstrate the difficulty in calculate the local uncertainty associated with two-variable ratio. When Yamamoto et al. (2017) identified this gap, they developed equations capable of calculating values from the ratio of two variables considering their uncertainties, which in this case is the average of esti-mated blocks, in addition to the local variance or uncertainty associated with the estimates, applying the Mathematical Expectation factor to the function f (x, y) = X / Y, and expanding it to second order by the Taylor Series. The objectives proposed by this Dissertation were based on these mathematical gaps and the test of this new methodology of indirect evaluation of stratiform mineral deposits using a real data from a phosphate research project owned by BEMISA - Brasil Exploração Mineral SA in the State of Mato Grosso. For the development of this work, a number of statistical and geostatistical tools were used, in which it was possi-ble to contemplate phosphatic deposits of approximately 7 million tons at an average 3.21% P2O5 content, considering a cut-off of 1,8%.
67

Two functions of lysyl oxidase like-2 : extracellular matrix maturation and cell proliferation

Saxena, Debashree 28 September 2016 (has links)
Lysyl oxidase like-2 (LOXL2) was found to be present extracellularly in primary human gingival fibroblast cells. This project has been primarily focused on investigating our hypothesis that LOXL2 may play a critical role in regulating cell proliferation and collagen accumulation in primary human gingival fibroblast cells, which may contribute to the development of fibrotic changes in human gingival tissue. LOXL2 shRNA lentivirus reduced the LOXL2 mRNA and protein expression by 90 – 95%. Knockdown of LOXL2 or inhibition of LOXL2 enzymatic activity strongly inhibited both basal and CCN2/CTGF-stimulated collagen accumulation (p<0.05). Proliferation assays demonstrated a marked decrease in cell proliferation in both the short and long term in LOXL2 shRNA knockdown cells with minimal or no stimulation of cell apoptosis. Pharmacologic inhibition of LOXL2 enzyme activity reduced basal and CCN2/CTGF-stimulated cell proliferation (40% and 50%) in short term cultures. Furthermore, there was 15-20% inhibition seen in long term assays. Recombinant active LOXL2 significantly increased collagen accumulation and cell proliferation (p<0.05). Thereby, our investigation in vitro by loss and gain of function experiments confirmed that LOXL2 is critically required for both gingival fibroblast proliferation and for collagen accumulation in the presence or absence of CCN2/CTGF. LOXL2 stimulation is critical for both proliferation and collagen accumulation in primary human gingival fibroblasts. Lastly, we found that the presence of LOXL2 extracellularly and LOXL2 may regulate cell proliferation by enhancing the phosphorylation of PDGFR.
68

Um estudo sobre o planejamento e a reprodução social em Alagoas / A study about planning and the social reproduction in Alagoas

Brandão, Luiz Felipe Leão Maia 11 May 2016 (has links)
O estado de Alagoas se caracteriza pela precariedade de suas infraestruturas e pelo baixo nível de reprodução da força de trabalho, possuindo indicadores socioeconômicos abaixo da - já precária - média nacional, ou mesmo nordestina. A presente tese se propõe a investigar os determinantes da formação social em Alagoas, desde sua emancipação política em 1817, aos dias atuais. Para tal, serão analisados os estágios de desenvolvimento das forças produtivas em escala nacional e no recorte local, e os reflexos desse processo no âmbito da reprodução social. Como fio condutor dessa análise, são descritas diferentes modalidades de planejamento produzidas ao longo dos anos pelo Estado brasileiro, em paralelo cronológico com as ações adotadas pelos governos alagoanos. Mediante a incorporação da teoria da acumulação entravada (Deák, 1991), defende-se a tese de que os diferentes níveis de desenvolvimento das forças produtivas e do nível de reprodução da força de trabalho, observados nas distintas configurações espaciais do país, são constitutivos de uma só totalidade. O quadro alagoano se explica, assim, não como resultado de um \"desvio\", equalizável mediante reforma, mas justamente pela natureza do papel ocupado por esse estado na reprodução social brasileira. / The Brazilian state of Alagoas is characterized by the precariousness of its infrastructure and the low level of its labor force reproduction, possessing socioeconomic indicators situated below the national average. The aim of this dissertation is to investigate the determinants of the social formation in the state of Alagoas (Brazil), since its political emancipation in 1817, to the present date. For such, the development stages of the production forces will be examined, at national and local scales. As the main guidelines of this analysis, the dissertation will describe the different kinds of planning tools produced through the years by the Brazilian State, in chronological parallel with the actions taken by the successive governments of Alagoas. By incorporating the theory of hindered accumulation (Deák, 2016), this work defends that the different productive forces development levels and workforce levels observed in the country are constitutive of a single totality. Therefore, the Alagoas circumstances are explainable not because of a \"deviation\" equalizable by reform, but precisely because of the role played by this state in the Brazilian social reproduction
69

Socially constructed luck and exploitation

Mulkeen, Nicola January 2017 (has links)
This thesis shows that exploitation can arise from a just background, via just steps, when we exercise our moral rights. The theory rests on the idea that exploitation can arise via a special category of luck, which I call socially constructed luck. By taking into account what John Rawls calls background justice and what G.A. Cohen refers to as an accumulation problem, I argue that socially constructed luck is brought about through a cumulative process of people freely exercising their moral rights in the pursuit of their own conception of the good life. Unless the negative effects of this type of luck are offset, exploitative interactions can arise where people have no reasonable alternative but to enter a particular transaction. Socially constructed luck can play a direct role in privileging some individuals at the expense of others and allows for the extraction of surplus benefits. Importantly, by showing that luck egalitarianism should be understood within a conception of exploitation, the thesis not only provides a deeper understanding of how the luck egalitarian and relational egalitarian views align, but also justifies the introduction of a basic right to a reasonable alternative.
70

UtilizaÃÃo da simulaÃÃo molecular na prediÃÃo da acumulaÃÃo de alcanos em estruturas metalorgÃnicas / Using of molecular simulation on the prediction of hydrocarbon accumulation in metalorganic frameworks

Paulo Graziane MendonÃa Mileo 28 April 2014 (has links)
Conselho Nacional de Desenvolvimento CientÃfico e TecnolÃgico / O gÃs natural, cuja maior parte à constituÃda de metano, à um combustÃvel que vem se expandindo no mercado energÃtico global por possuir uma queima mais limpa que outros derivados petrolÃferos e por ser mais eficiente energeticamente. No entanto, ele possui como grande desvantagem frente a outros combustÃveis a dificuldade em ser armazenado devido a sua baixa densidade. Materiais microporosos vÃm sendo utilizados para aumentar tal densidade por meio da adsorÃÃo. No entanto, um dos problemas encontrados na utilizaÃÃo desses materiais se trata da diminuiÃÃo da capacidade adsortiva apÃs ciclos de carga e descarga de tanques de armazenamento. O estudo desse problema, porÃm, demanda um grande nÃmero de experimentos e uma aparelhagem relativamente sofisticada. Este trabalho propÃs a simulaÃÃo molecular como uma metodologia vÃlida a ser utilizada para o estudo da retenÃÃo de alcanos em carbono ativado e em oito estruturas metalorgÃnicas: IRMOF-1, ZIF-8, CuBTC, PCN-11, PCN-14, UiO-66, MIL-100 e MIL-101. Considerou-se o gÃs natural como uma mistura de metano (C1), etano (C2), propano (C3) e butano (C4) nas proporÃÃes de, respectivamente, 84,7:10:0,9:0,1. Para a validaÃÃo dos modelos utilizados nassimulaÃÃes, as isotermas simuladas de C1, C2, C3 e C4 foram ajustadas Ãs experimentais obtidas da literatura para cada um dos materiais. Foram entÃo realizadas isotermas multicomponentes e estudo de sÃtios de adsorÃÃo para o estudo da retenÃÃo de hidrocarbonetos e da influÃncia de fatores composicionais e estruturais nesse fenÃmeno. Observou-se que as MOFs MIL-100 e ZIF-8 sÃo as mais recomendadas para uso em tanques de GNA por critÃrios de capacidade, eficiÃncia adsortiva e estabilidade. Verificou-se ainda que MOFs que apresentam sÃtios de adsorÃÃo pouco dispersos apresentam uma maior tendÃncia à acumulaÃÃo de hidrocarbonetos. / Natural gas, which consists mostly of methane, is a fuel that has been expanding in the global energy market by having a cleaner burning than other petroleum derivatives and are more energy efficient. However, it has a great disadvantage compared to other fuels: it is difficult to be stored due to its low energy density. Microporous materials have been used to increase the energy density by adsorption. However, one of the problems encountered in using these materials it comes to the decrease in adsorption capacity after charge and discharge cycles of the storage tanks. The study of this problem, however, requires a large number of experiments and a relatively sophisticated equipment. This paper proposes themolecular simulation as a valid methodology to study the retention of alkanes in activated carbon, and eight metalorganic structures: IRMOF - 1, ZIF - 8, CuBTC, PCN- 11, PCN -14, UiO -66, MIL -100 and MIL- 101. We considered the natural gas as a mixture of methane (C1), ethane (C2), propane (C3) and butane (C4) in the proportions respectively 84,7:10:0,9:0,1. For the validation of the models used in the simulations, the simulated isotherms of C1, C2, C3 and C4 were adjusted to fit the experimental ones, obtained from the literature data for every material. Multicomponent isotherms were then performed, the retention of hydrocarbons were studied as well as the influence of compositional and structural factors to this phenomenon. We noticed that the MOFs MIL-100 and ZIF-8 are the most recommended to use in GNA tanks according to the criteria of capacity, adsorption efficiency and stability. We verified as well that MOFs that have adsorption sites too localized present a larger tendency to the accumulation of hydrocarbons.

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