Sejam K um corpo algebricamente fechado, A uma K-álgebra básica conexa de dimensão finita sobre K e ê=(e_1,e_2,... ,e_n) um conjunto completo de idempotentes ortogonais, primitivos e ordenados de A. O conjunto dos módulos estandares é o conjunto Delta ={ D_1, ..., D_n }, onde D_i é o quociente maximal do A-módulo projetivo P_i com fatores de composição simples S_j, com j\\leq i, F(Delta) é a subcategoria plena de mod A dos módulos têm uma Delta-filtração. Se A_A esta em F(Delta) diz-se que A é uma álgebra estandarmente estratificada. Se, além disso, para cada elemento em Delta vale que End_A(D_i) é isomorfo a K diz-se que A é uma álgebra álgebra quase-hereditária. Nesta dissertação estudamos as propriedades de F(Delta), especialmente quando A é estandarmente estratificada, e algumas condições necessárias e suficientes para que A seja quase-hereditária. / Let K be an algebraically closed field, A a basic, connected, finite dimensional K-algebra and ê=(e_1,e_2,...,e_n) a complete set of ordered primitive orthogonal idempotents of A. The set of standard modules is the set Delta={D_1, ..., D_n}, where D_i is the maximal factor submodule of P_i whose composition factors are isomorphic to S_j, for j\\leq i. We denote by F(Delta) the full subcategory of mod A containing the modules which are filtered by modules in Delta. If iA_A is in F(Delta) we say that A is standardly stratified. Moreover, if End_A(D_i) is isomorphic with K, for each element in Delta we say that A is quasi hereditary. In this work we study the properties of the category F(Delta), especially when A is stardardly stratified, and some necessary and sufficient conditions to A be quasi hereditary.

Orientadores: Teresa Massako Kakuta Ravagnani, Sergio Persio Ravagnani / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Engenharia Quimica / Made available in DSpace on 2018-08-12T00:32:27Z (GMT). No. of bitstreams: 1 Souza_AndersonGomes_M.pdf: 1513239 bytes, checksum: fd19ca410b3d800b0b215aa2175ae192 (MD5) Previous issue date: 2007 / Resumo: A redução dos níveis de dióxido de carbono (CO2) é de suma importância, tanto para o combate à poluição atmosférica proveniente de atividades industriais, como no tratamento de correntes gasosas em processos químicos. O método clássico para captura de CO2 engloba sua absorção reativa em solução de aminas, conduzida em colunas de borbulhamento, spray ou recheio. Porém, desvantagens como a formação de espuma e dispersão de fase constituem problemas operacionais significativos desses processos. Alternativamente, módulos de membrana de fibras ocas seriam equipamentos mais adequados para esse fim, apresentando como vantagens uma grande área interfacial e flexibilidade operacional. Nesse sentido, o presente estudo buscou realizar a simulação do processo de absorção de CO2 em módulos de membrana, utilizando soluções aquosas de2-amino-2-metil-1-propanol (AMP), dietanolamina (DEA) e metildietanolamina (MDEA). A modelagem matemática do sistema utilizou expressões da taxa de reação e equações de balanço de massa diferenciais. A resolução numérico-computacional do modelo foi conduzida mediante aplicação dos métodos de colocação ortogonal e de Michelsen, tendo sido implementada em linguagem Fortran. O processo foi estudado em diversas condições operacionais para a análise de sensibilidade paramétrica e os resultados indicam, com base nas características dos diferentes sistemas, as melhores condições gerais de operação. Dentre as aminas consideradas como solventes reativos, as maiores taxas de absorção de CO2 foram previstas com o uso de AMP. Entretanto, sua concentração radial, à saída do módulo de membrana, apresentou forte incidência do fenômeno de depleção da solução absorvedora. Os principais parâmetros que incrementaram a taxa de absorção e, conseqüentemente, a eficiência do módulo de membrana, foram a velocidade de escoamento do líquido absorvente, as concentrações iniciais de CO2 e de amina, o raio interno e o comprimento das fibras. / Abstract: The decrease in the carbon dioxide (CO2) levels is extremely important to avoid atmospheric pollution, from industrial activities, and to the gaseous treatment in several chemical processes. The classical process to the CO2 sequestration involves its reactive absorption into amine solutions, which are carried on bubble, spray or fixed bed columns. However, some disadvantages, such as foam formation and phase dispersion, are serious operational problems to be avoided. Alternatively, membrane modules are supposed to be mode adequate equipments to that aim, which some advantages are great interfacial area and operational flexibility. Under this context, the present study intended to provide the simulation of the CO2 absorption process in hollow fiber membrane module, by using a-amino-2-methyl-1-propanol (AMP), diethanolamine (DEA) and methyldiethanoamine (MDEA) aqueous solutions. The mathematical modeling is based on the inherent rate expressions of the reactive system, besides the differential mass balance equations. The numerical and computational solution was developed by applying the orthogonal collocation and Michelsen methods, which were compiled in Fortran language. The idealized process was studied based on a given standard operational condition, besides a parametric sensibility analysis. The main results, to each sorption system, show the best general conditions to the process operation. Under the standard operation, among the alkanolamines considered as reactive solvents, the best CO2 absorption rate were calculated by using the AMP solution. Nevertheless, its radial concentration tends to suffer the incidence of depletion phenomena in their aqueous solution. The best performance credited to the AMP solution were also confirmed, where the main parameters that increased the absorption rate were the absorbent liquid flow velocity, the initial CO2 and amine concentration, the fibers inner radius and length. / Mestrado / Sistemas de Processos Quimicos e Informatica / Mestre em Engenharia Química

Module extraction is the task of computing a (preferably small) fragment <i>M</i> of an ontology <i>O</i> that preserves a class of entailments over a signature of interest ∑. Existing practical approaches ensure that <i>M</i> preserves all second-order entailments of <i>O</i> over ∑, which is a stronger condition than is required in many applications. In the first part of this thesis, we propose a novel approach to module extraction which, based on a reduction to a datalog reasoning problem, makes it possible to compute modules that are tailored to preserve only specific kinds of entailments. This leads to obtaining modules that are often significantly smaller than those produced by other practical approaches, as shown in an empirical evaluation. In the second part of this thesis, we consider the application of module extraction to the optimisation of ontology classification. Classification is a fundamental reasoning task in ontology design, and there is currently a wide range of reasoners that provide this service. Reasoners aimed at so-called lightweight ontology languages are much more efficient than those aimed at more expressive ones, but they do not offer completeness guarantees for ontologies containing axioms outside the relevant language. We propose an original approach to classification based on exploiting module extraction techniques to divide the workload between a general purpose reasoner and a more efficient reasoner for a lightweight language in such a way that the bulk of the workload is assigned to the latter. We show how the proposed approach can be realised using two particular module extraction techniques, including the one presented in the first part of the thesis. Furthermore, we present the results of an empirical evaluation that shows that this approach can lead to a significant performance improvement in many cases.

Magister Scientiae - MSc / Ischemic heart disease is a disease which is characterized by the reduced blood supply to the heart. According to WHO 2013, ischemic heart disease is one of the major causes of death globally. For this reason, it is imperative to search for methods whereby heart cells can be protected from cell death. The upregulation of heat shock proteins (Hsps) is one of the major techniques which can be used to protect the heart cells from Hsps cell death and improve the tolerance to ischemic stresses in various models. The increased expression of Hsps during heat shock pre-conditioning is regulated by heat shock transcription factors (HSFs). HSFs orchestrate the initiation of gene expression by binding to sequence motifs, known as cis-acting regulatory elements (CAREs). Since gene expression is regulated at a transcriptional level, it is expected that functionally related genes (e.g. heat shock response genes) might also be regulated by the same transcription factors (TFs). In this study an in silico approach was performed to identify the promoter sequences of 50 known heat shock responsive genes using Genomatix Software. This software was also used to identify transcription factor binding sites that are statistically over represented in the promoter sequences of these genes. The use of the Electrophoretic Mobility Shift Assay was included to confirm that protein cell lysates of stressed cells contain proteins (TFs) that bind to this sequence (SP1F_KLFS_01). Luciferase promoter reporter assay were also used to iii investigate the transcriptional activity of mutant promoter constructs in which the SP1F_KLFS_01 was mutated. SP1F_KLFS_01 is a ±25 base pair sequence that was identified in the promoter sequences of 19 heat shock responsive genes, including the well-known Hsp70 and Hsp90. This sequence is a potential binding site for two TFs, Specificity Protein-1 and Krueppel like TFs. Consequently, the aim of this study is to identify CAREs that are statistically over-represented in the promoter regions of heat shock response genes. In conclusion, in vitro experiments of this study did not support the findings of the in silico experiments, therefore additional methods should be implemented to expand the investigation for the involvement of cis-acting regulatory elements in the regulation of heat shock proteins in cardiomyocytes, prior to heat shock.

The Czech Republic has approximately 2 126 MWp of photovoltaic installed power capacity, most of the capacity was installed during the "solar boom" period around year 2010. Directive 2012/19/EU on waste electrical and electronic equipment led to the amendment of Act no. 185/2001 Coll. on Waste and the Decree no. 178/2013 Coll., which set the photovoltaic power plant operator´s obligation to pay a contribution for the module´s future recycling. The current rate for calculating the minimum total amount of the contribution is set at CZK 8.50/kg of module. The current amount of the contribution is a subject to criticism. The diploma thesis analyzes public administrations on issues of environmental protection and tools that may be used to motivate polluters. The thesis proposes a new amount of recycling contribution at the amount of CZK 5.2-7.8/kg. Huge temporal inconsistency is the most dangerous risk in determining the contribution, which may threaten many variables essential for the whole calculation.

Orientador: Dessislava H. Kochloukova / Tese (doutorado) - Universidade Estadual de Campinas. Instituto de Matematica, Estatistica e Computação Cientifica / Made available in DSpace on 2018-08-07T18:15:42Z (GMT). No. of bitstreams: 1 Rodrigues_ClaudenirFreire_D.pdf: 1150293 bytes, checksum: 63045fd15f6ef421699cbcf26de55d92 (MD5) Previous issue date: 2006 / Resumo: Neste trabalho estudamos grupos abstratos finitamente gerados G que são extensões cindidas de um grupo abeliano A por um grupo Q nilpotente de classe 2. Mostramos que se G tem tipo homológico F P3, então o quociente G/N também tem tipo homológico F P3 onde N é o fecho normal do centro de Q em G. Observamos que não existe classificação quando G pode ter tipo FP3, nem classificação para tipo F P2 ou ser finitamente apresentável. Por causa disso nós trabalhamos com um quociente especifico de G. Ainda fica em aberto se cada quociente de G tem tipo FP3 quando G tem tipo FP3. Observamos que isso vale quando G é grupo metabeliano, nesse caso a teoria de Bieri-Strebel pode ser aplicada / Abstract: We study abstract finitely generated groups G that are split extensions from A abelian group by Q nilpotent group of class two. We show that if G has homological type FP3 then the quotient group GjN has homological type FP3 too, where N is the normal closure of the center of Q in G. Since there is no classification when G is of type FP3, nor when G is of type FP2 or finitely presented we work with one specific quotient. It is an open problem whether every quotient of G has type F P3. This holds if G is a metabelian group and in this case the Bieri-Strebel theory applies / Doutorado / Doutor em Matemática

In this paper we have developed a general theory of characteristic classes of modules. To a given invariant map defined on a Lie algebra, we associate a cohomology class by using the curvature form of a certain kind of connections. Here we present a very simple proof of the invariance theorem (Theorem 12), which states that equivalent connections give rise to the same characteristic class. We have used those invariant maps of {9} to define Chern classes of projective modules and we have derived their basic properties. It might be interesting to observe that this theory could be applied to define characteristic classes of bilinear maps. In particular, the Euler classes of {6} can be obtained in this way.

abstract: The popularity of solar photovoltaic (PV) energy is growing across the globe with more than 500 GW installed in 2018 with a capacity of 640 GW in 2019. Improved PV module reliability minimizes the levelized cost of energy. Studying and accelerating encapsulant browning and solder bond degradation—two of the most commonly observed degradation modes in the field—in a lab requires replicating the stress conditions that induce the same field degradation modes in a controlled accelerated environment to reduce testing time. Accelerated testing is vital in learning about the reliability of solar PV modules. The unique streamlined approach taken saves time and resources with a statistically significant number of samples being tested in one chamber under multiple experimental stress conditions that closely mirror field conditions that induce encapsulant browning and solder bond degradation. With short circuit current (Isc) and series resistance (Rs) degradation data sets at multiple temperatures, the activation energies (Ea) for encapsulant browning and solder bond degradation was calculated. Regular degradation was replaced by the wear-out stages of encapsulant browning and solder bond degradation by subjecting two types of field-aged modules to further accelerated testing. For browning, the Ea calculated through the Arrhenius model was 0.37 ± 0.17 eV and 0.71 ± 0.07 eV. For solder bond degradation, the Arrhenius model was used to calculate an Ea of 0.12 ± 0.05 eV for solder with 2wt% Ag and 0.35 ± 0.04 eV for Sn60Pb40 solder. To study the effect of types of encapsulant, backsheet, and solder on encapsulant browning and solder bond degradation, 9-cut-cell samples maximizing available data points while minimizing resources underwent accelerated tests described for modules. A ring-like browning feature was observed in samples with UV pass EVA above and UV cut EVA below the cells. The backsheet permeability influences the extent of oxygen photo-bleaching. In samples with solder bond degradation, increased bright spots and cell darkening resulted in increased Rs. Combining image processing with fluorescence imaging and electroluminescence imaging would yield great insight into the two degradation modes. / Dissertation/Thesis / Doctoral Dissertation Systems Engineering 2020

L'espace de modules Mgbar des courbes stables de genre g est un object central en géométrie algébrique. Du point de vue de la géométrie birationelle, il apparaît naturel se demander si Mgbar est de type générale. Harris-Mumford et Eisenbud-Harris ont montré que Mgbar est de type générale pour un genre g>=24 et g=22. Le cas g=23 est encore misterieux. Dans les dix dernières années une nouvelle approche a émergé, dans l'essai de clarifier ça : l'idée est celle de considérer de recouvrement fini de Mgbar qui sont des espaces de modules de courbes stables munies d'une structure additionnelle comme un l-recouvrement (racine l-ième du fibré trivial) ou un fibré l-spin (racine l-ième du fibré canonique). Ces espaces ont la propriété que la transition au type générale se produit à un genre inférieur. Dans ce travail nous voulons généraliser cette approche de deux façons : - un étude de l'espace de modules des courbes avec une racine d'une puissance quelconque du fibré canonique ; - un étude de l'espace de modules des courbes avec un G-recouvrement pour un quelconque G groupe fini. Pour définir ces espaces de modules nous utilisons la notion de courbe twisted (voir Abramovich-Corti-Vistoli). Le résultat fondamental obtenu est qu'il est possible de décrire le lieu singulier de ces espaces de modules par la notion de graphe dual d'une courbe. Grace à cette analyse, nous pouvons developper des calculs dans l'anneau tautologique des espaces, et en particulier nous conjecturons que l'espace de modules des courbes avec un S3-recouvrement est de type générale pour genre impaire g>=13. / The moduli space Mgbar of genus g stable curves is a central object in algebraic geometry. From the point of view of birational geometry, it is natural to ask if Mgbar is of general type. Harris-Mumford and Eisenbud-Harris found that Mgbar is of general type for genus g>=24 and g=22. The case g=23 keep being mysterious. In the last decade, in an attempt to clarify this, a new approach emerged: the idea is to consider finite covers of Mgbar that are moduli spaces of stable curves equipped with additional structure as l-covers (l-th roots of the trivial bundle) or l-spin bundles (l-th roots of the canonical bundle). These spaces have the property that the transition to general type happens to a lower genus. In this work we intend to generalize this approach in two ways: - a study of moduli space of curves with any root of any power of the canonical bundle; - a study of the moduli space of curves with G-covers for any finite group G. In order to define these moduli spaces we use the notion of twisted curve (see Abramovich-Corti-Vistoli). The fundamental result obtained is that it is possible to describe the singular locus of these moduli spaces via the notion of dual graph of a curve. Thanks to this analysis, we are able to develop calculations on the tautological rings of the spaces, and in particular we conjecture that the moduli space of curves with S3-covers is of general type for odd genus g>=13.

京都大学 / 新制・課程博士 / 博士(情報学) / 甲第23324号 / 情博第760号 / 新制||情||130(附属図書館) / 京都大学大学院情報学研究科システム科学専攻 / (主査)教授 大塚 敏之, 教授 石井 信, 教授 太田 快人 / 学位規則第4条第1項該当 / Doctor of Informatics / Kyoto University / DFAM