5 research outputs found
Cross Section Ionization By Electron Impact Of Helium Like Ions
No full textIn this paper we present our calculation of the cross section ionization by electron impact of C V, N VI and O VII. Using the Flexible Atomic Code (FAC), we obtain the cross sections for the ionization of these ions from the ground state 1The presentation of the authors' names and (or) special characters in the title of the pdf file of the accepted manuscript may differ slightly from what is displayed on the item page. The information in the pdf file of the accepted manuscript reflects the original submission by the author
High-resolution melting-curve (HRM) analysis for C. meleagridis identification in stool samples
No full textFormulação axiomática de uma política florestal: preservação das espécies arbóreas tropicais e desenvolvimento econômico
No full textTese (doutorado) - Universidade Federal de Santa Catarina, Centro Tecnológico. Programa de Pós-Graduação em Engenharia de Produção.Este trabalho nasceu do duplo desafio de elaborar uma tecnologia de manejo da floresta tropical sem prejuízo de sua diversidade biológica original e, ao mesmo tempo, verificar sob que condições de política econômica e florestal esta tecnologia se poderia tornar economicamente viável. A tecnologia, denominada de manejo natural, foi gradativamente se cristalizando ao longo de mais de duas décadas de manejo comercial em propriedade situada na Mata Atlântica de Santa Catarina, com sua riqueza de mais de cem espécies arbóreas. Tendo sido estabelecidas determinadas normas de seleção de árvores para corte, se colocou a questão de como, formalmente, a elas se chegara. Verificou-se que as relações causais que caracterizam os conhecimentos técnico-científicos de engenharia florestal e de produção, como os organizados em modelo da dinâmica da floresta, eram somente um dos componentes de um processo decisório que culminava com o estabelecimento das regras de seleção. Com isto, o enfoque foi centrado na descrição do processo decisório em si. A formalização da sua estrutura conduziu à agregação de um componente adicional às relações causais e às normas, qual seja, o universo dos desejos individuais e dos valores sociais. O cerne formal do trabalho se constitui na formulação de uma axiomática do que se denominou uma práxis, integradora dos três componentes da estrutura de um processo decisório. Elementos da filosofia da linguagem e da lógica modal foram utilizados para se estabelecer uma forma única de expressão dos valores, das relações causais e das normas. Esta forma é a sentença intencional da filosofia continental da Europa, também denominada de propositional attitude pela filosofia inglesa. Uma vez descrito o processo decisório do manejo natural tout court, procedeu-se à sua integração ao processo decisório global de uma empresa florestal competitiva. O limitado conceito de função de produção da microeconomia neoclássica foi, inicialmente, revisto para abrigar os detalhes da engenharia da produção e, posteriormente, inserido em contexto mais amplo para coadunar o esforço de desenvolvimento da empresa e o estabelecimento de uma política florestal promotora do desenvolvimento macroeconômico. Conclui-se como Indispensável para a viabilização econômica do manejo natural o acesso ao mercado internacional de créditos de carbono, cuja institucionalização veio na esteira do Protocolo de Quioto
Analysis of MTNR1A Genetic Polymorphisms and Their Association with the Reproductive Performance Parameters in Two Mediterranean Sheep Breeds
No full textSheep farming plays an important economic role, and it contributes to the livelihoods of many rural poor in several regions worldwide and particularly in Tunisia. Therefore, the steady improvement of ewes’ reproductive performance is a pressing need. The MTNR1A gene has been identified as an important candidate gene that plays a key role in sheep reproduction and its sexual inactivity. It is involved in the control of photoperiod-induced seasonality mediated by melatonin secretion. The aim of this study was to identify SNPs in the MTNR1A gene in two Tunisian breeds, Barbarine (B) and Queue Fine de l’Ouest (QFO). DNA extracted from the blood of 77 adult ewes was sequenced. Selected ewes were exposed to adult fertile rams. A total of 26 SNPs were detected; 15 SNPs in the promoter region and 11 SNPs in the exon II were observed in both (B) and (QFO) breeds. The SNP rs602330706 in exon II is a novel SNP detected for the first time only in the (B) breed. The SNPs rs430181568 and rs40738822721 (SNP18 and SNP20 in our study, respectively) were totally linked in this study and can be considered a single marker. DTL was associated with SNP18 and SNP20 in (B) ewes (p < 0.05); however, no significant difference was detected between the three genotypes (G/G, G/A, and A/A) at these two SNPs. Fertility rate and litter size parameters were not affected by SNP18 and SNP20. There was an association between these two polymorphisms and (B) lambs’ birth weights (p < 0.05). Furthermore, the ewes with the A/A genotype gave birth to lambs with a higher weight compared to the other two genotypes for this breed (p < 0.05). There was not an association between SNP 18 and SNP20 and (QFO) ewes’ reproductive parameters. These results might be considered in future sheep selection programs for reproductive genetic improvement
Knowledge representation within information systems in manufacturing environments
No full textThis thesis was submitted for the degree of Doctor of Philosophy and awarded by Brunel University.Representing knowledge as information content alone is insufficient in providing us with an understanding of the world around us. A combination of context as well as reasoning of the information content is fundamental to representing knowledge in an information system. Knowledge Representation is typically concerned with providing structures and theories that are used as a basis for intelligent reasoning. For this research however, the author defines an alternative meaning, which is related to how knowledge is used in a given context. Thus, this dissertation provides a contribution to the field of knowledge within information systems, in terms of the development of a frame-of-reference that will support the reader in navigating through the different forms of explicit and tacit knowledge use within the manufacturing industry. In doing so, the dissertation also presents the generation of a novel classification of three forms of knowledge (Structural, Interpretive and Evaluative forms); the development of a conceptual framework which highlights the drivers for knowledge transformation; and the development of a conceptual model which seeks to envelop both the content as well as the context of knowledge (Semiotic as well as Symbiotic factors). This is established through the use of an Empirical, Quantitative case study approach, that seeks to explore an interpretivist view of knowledge representation within two information systems contexts, within two UK manufacturing organisations. The first case study presents how a-priori knowledge assumptions are used in a computer aided engineering decision-making task within a high technology manufacturing company. The second case study shows how knowledge is used within the IT/IS investment evaluation decision making process, within a manufacturing SME. In doing so, both case studies attempt to elucidate the inherent, underlying relationship between explicit and tacit knowledge, via a frame-of-reference developed by the author which defines key drivers for knowledge transformation
