959 resultados para Poles and zeros


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This project had a threefold aim and sought to provide answers to several different questions. Kossowska first focused on the relationship between Openness to Experience and ideological variables such as authoritarianism and conservatism. The main questions here were (1) whether there are differences between the Polish and Belgian samples studied with respect to the relationship between political ideology and Openness to Experience, and (2) whether this relationship applies to all facets of Openness to Experience. The study showed significant negative correlations between Openness and right-wing ideology in both adult samples, and that Fantasy and Actions were the most robust correlates of political ideology. A second problem examined concerned the relationship between ideology and cognitive functioning. The important questions here were about the conceptualisation and measurement of cognitive variables such as rigidity, intolerance of ambiguity, or the need for closure, which determine individuals' attitudes to politics. The results confirmed the significance of the need for closure construct in both samples for understanding the process of formulating and holding political beliefs. The last aspect of the study was the differences in political beliefs between the Polish and Belgian samples in relation to the social, political and economic situation in the two countries. The most important question here was the changes in the political mentality of Poles during the period of system transition. Kossowska expected to find differences between Poles and Belgians with respect to the level of conservatism and authoritarianism, but in fact both samples showed comparable levels of right-wing political beliefs.

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Geomagnetic excursions, i.e. short periods in time with much weaker geomagnetic fields and substantial changes in the position of the geomagnetic pole, occurred repeatedly in the Earth's history, e.g. the Laschamp event about 41 kyr ago. Although the next such excursion is certain to come, little is known about the timing and possible consequences for the state of the atmosphere and the ecosystems. Here we use the global chemistry climate model SOCOL-MPIOM to simulate the effects of geomagnetic excursions on atmospheric ionization, chemistry and dynamics. Our simulations show significantly increased concentrations of nitrogen oxides (NOx) in the entire stratosphere, especially over Antarctica (+15%), due to enhanced ionization by galactic cosmic rays. Hydrogen oxides (HOx) are also produced in greater amounts (up to +40%) in the tropical and subtropical lower stratosphere, while their destruction by reactions with enhanced NOx prevails over the poles and in high altitudes (by −5%). Stratospheric ozone concentrations decrease globally above 20 km by 1–2% and at the northern hemispheric tropopause by up to 5% owing to the accelerated NOx-induced destruction. A 5% increase is found in the southern lower stratosphere and troposphere. In response to these changes in ozone and the concomitant changes in atmospheric heating rates, the Arctic vortex intensifies in boreal winter, while the Antarctic vortex weakens in austral winter and spring. Surface wind anomalies show significant intensification of the southern westerlies at their poleward edge during austral winter and a pronounced northward shift in spring. Major impacts on the global climate seem unlikely.

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The aim of this study was to compare facial development in subjects with complete unilateral cleft lip and palate (CUCLP) treated with two different surgical protocols. Lateral cephalometric radiographs of 61 patients (42 boys, 19 girls; mean age, 10.9 years; SD, 1) treated consecutively in Warsaw with one-stage repair and 61 age-matched and sex-matched patients treated in Oslo with two-stage surgery were selected to evaluate craniofacial morphology. On each radiograph 13 angular and two ratio variables were measured in order to describe hard and soft tissues of the facial region. The analysis showed that differences between the groups were limited to hard tissues – the maxillary prominence in subjects from the Warsaw group was decreased by almost 4° in comparison with the Oslo group (sella-nasion-A-point (SNA) = 75.3° and 79.1°, respectively) and maxillo-mandibular morphology was less favorable in the Warsaw group than the Oslo group (ANB angle = 0.8° and 2.8°, respectively). The soft tissue contour was comparable in both groups. In conclusion, inter-group differences suggest a more favorable outcome in the Oslo group. However, the distinctiveness of facial morphology in background populations (ie, in Poles and Norwegians) could have contributed to the observed results.

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The climate during the Cenozoic era changed in several steps from ice-free poles and warm conditions to ice-covered poles and cold conditions. Since the 1950s, a body of information on ice volume and temperature changes has been built up predominantly on the basis of measurements of the oxygen isotopic composition of shells of benthic foraminifera collected from marine sediment cores. The statistical methodology of time series analysis has also evolved, allowing more information to be extracted from these records. Here we provide a comprehensive view of Cenozoic climate evolution by means of a coherent and systematic application of time series analytical tools to each record from a compilation spanning the interval from 4 to 61 Myr ago. We quantitatively describe several prominent features of the oxygen isotope record, taking into account the various sources of uncertainty (including measurement, proxy noise, and dating errors). The estimated transition times and amplitudes allow us to assess causal climatological-tectonic influences on the following known features of the Cenozoic oxygen isotopic record: Paleocene-Eocene Thermal Maximum, Eocene-Oligocene Transition, Oligocene-Miocene Boundary, and the Middle Miocene Climate Optimum. We further describe and causally interpret the following features: Paleocene-Eocene warming trend, the two-step, long-term Eocene cooling, and the changes within the most recent interval (Miocene-Pliocene). We review the scope and methods of constructing Cenozoic stacks of benthic oxygen isotope records and present two new latitudinal stacks, which capture besides global ice volume also bottom water temperatures at low (less than 30°) and high latitudes. This review concludes with an identification of future directions for data collection, statistical method development, and climate modeling.

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We characterize the region of meromorphic continuation of an analytic function ff in terms of the geometric rate of convergence on a compact set of sequences of multi-point rational interpolants of ff. The rational approximants have a bounded number of poles and the distribution of interpolation points is arbitrary.

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Since Puntam's seminal work on declining levels of social capital, the question of how social trust is formed has reached unprecedented heights of critical enquiry. While most of the current research concentrates on ethnic diversity and income inequality as the main influences driving down generalized trust, we focus on opinion polarization as another potential impact factor on trust. In more detail, we investigate the extent to which polarization over morally charged issues such as homsexuality, abortion and euthanasia affects individuals' likelihood to trust others. We hypothesize that moral issues have a natural tendency to divide societies' opinions into opposing poles and, thus, to challenge social cohesion in modern civil societies. Based on hierarchical analyses of the fifth wave of the World Values Survey (WVS) — comprising a sample of 39 countries — our results reveal that individuals living in countries characterized by more opinion polarization tend to have less trust in other people.

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This project set out to investigate the behaviour of a pole frame house subjected to a lateral wind load. The behaviour of poles embedded in the ground was examined. The existing theoretical methods for determining lateral load capacity of an embedded pole were reviewed, and three common methods of pole embedment were tested at different depths to gauge the response of poles and types of pole embedment to a lateral load. The most suitable embedment method was used in the foundation for a full-scale model pole house, which was constructed and tested at various stages during the construction to examine the response of a pole house to lateral wind load. The full scale testing was also used to monitor the effect of the various structural components on the overall stiffuess of the house. The results from the full scale tests were used to calibrate a computer model of a pole house which could then be used to predict the behaviour of different configurations of pole house construction without the need for further expensive full scale tests.

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More than 5 million timber utility poles are currently in-service throughout Australia’s energy networks. Most were produced from select native forest-grown hardwood species having the required structural characteristics and naturally-durable heartwood. Anecdotal evidence suggests that up to 70% of the timber poles that are currently in-service were installed over the 20 years following the end of World War Two, and these poles are likely to require replacement or remedial maintenance over the next decade. The purposes of this review were to clarify the supply and demand situation for traditional timber poles, and to investigate alternatives in terms of their potential availability and suitability.

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The Master’s thesis examines historical memory of the Polish minority members in Lithuania with regard to how their interpretation of the common Polish-Lithuanian history reiterates or differs from the official Polish and Lithuanian narratives conveyed by the school textbooks. History teaching in high schools carries a crucial state-supported role of “identity building policies” – it maintains a national narrative of memory, which might be exclusive to minorities and their peculiar understanding of history. Lithuanians Poles, in this regard, represent a national minority, which is exposed to two conflicting national narratives of the common past – Polish and Lithuanian. As members of the Polish nation, their understanding of the common Polish-Lithuanian history is conditioned by the Polish historical narrative, acquired as part of the collective memory of the family and/or different minority organizations. On the other hand, they encounter Lithuanian historical narrative of the Polish-Lithuanian past throughout the secondary school history education, where the curriculum, even if taught in Polish, largely represents the Lithuanian point of view. The concept of collective memory is utilized to refer to collective representations of national memory (i.e. publicly articulated narratives and images of collective past in history textbooks) as well as to socially framed individual memories (i.e. historical memory of minority members, where individual remembering is framed by the social context of their identity). The thesis compares the official national historical narratives in Lithuania and Poland, as conveyed by the Polish and Lithuanian history textbooks. The consequent analysis of qualitative interviews with the Polish minority members in Lithuania offers insights into historical memory of Lithuanian Poles and its relation to the official Polish and Lithuanian national narratives of the common past. Qualitative content analysis is applied in both parts of the analysis. The narratives which emerge from the interview data could be broadly grouped into two segments. First, a more pronounced view on the past combines the following elements: i) emphasis on the value of multicultural and diverse past of Lithuania, ii) contestation of “Lithuanocentricity” of the Lithuanian narrative and iii) rejection of the term “occupation”, based on the cultural presuppositions – the dominant position of Polish culture and language in the Vilnius region, symbolic belonging and “Lithuanianness” of the local Poles. While the opposition to the term of “occupation” is in accord with the official Polish narrative conveyed by the textbooks, the former two elements do not neatly adhere to either Polish or Lithuanian textbook narratives. They should rather be considered as an expression of claims for inclusion of plural pasts into Lithuanian collective memory and hence as claims for symbolic enfranchisement into the Lithuanian “imagined community”. The second strand of views, on the other hand, does not exclude assertions about the historically dominant position of Polish culture in Lithuania, but at the same time places more emphasis on the political and historical continuity of the Lithuanian state and highlights a long-standing symbolic connectedness of Vilnius and Lithuania, thus, striking a middle way between the Polish and Lithuanian interpretations of the past.

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ENGLISH: Most of the catches of yellowfin and skipjack tuna from the Eastern Pacific Ocean are made by vessels fishing with poles and lines and live bait. From 1931 to 1954, these baitboats, on the average, accounted for over three-fourths of the total annual California landings of yellowfin and skipjack (Shimada and Schaefer, 1956). With the substantial increase in recent years in the production of the tropical tunas, there have been greater demands for live bait. This increased need for larger amounts of baitfishes has given rise to important questions relating to the manner in which these populations may be most wisely used. The Inter-American Tropical Tuna Commission has been concerned with various aspects of this problem since its establishment in 1950. This report presents some of the results obtained from the Commission's studies of the baitfishes important to the fishery for yellowfin and skipjack tuna. It traces briefly the origin and development of the bait fishery, describes its operations, extent, and yield, and discusses some aspects of the effects of exploitation upon the Eastern Pacific baitfish populations, particularly of the anchoveta (Cetengaulis mysticetus). SPANISH: Los barcos que emplean cañas y cuerdas y carnada viva, son los que realizan la mayor parte de la pesca de atún aleta amarilla y barrilete en el Océano Pacifíco Oriental. De 1931 a 1954 estos barcos han desembarcado, en promedio, más de las tres cuartas partes de las pescas anuales de ambas especies (Shimada y Schaefer, 1956). Con el aumento sustancial en dicha producción en los últimos años, ha habido una mayor demanda por carnada viva. Esta creciente necesidad de obtener cantidades mayores de pecescebo, ha originado importantes cuestiones relativas a la mejor forma en que estas poblaciones pueden ser utilizadas. A la Comisión Interamericana del Atún Tropical le ha tocado ocuparse de varios aspectos de este problema, desde que fué establecida en el año 1950. Este informe ofrece algunos de los resultados obtenidos a través de los estudios de la Comisión sobre los peces-cebo importantes para la pesquería de atún aleta amarilla y barrilete; señala brevemente el origen y desarrollo de la pesquería de carnada; describe sus operaciones, extensión y rendimiento, y trata algunos aspectos de los efectos de la explotación sobre las poblaciones de dichos peces en el Pacifíco Oriental, particularmente de la anchoveta (Cetengraulis mysticetus). (PDF contains 59 pages.)

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The thesis is divided into two parts. Part I generalizes a self-consistent calculation of residue shifts from SU3 symmetry, originally performed by Dashen, Dothan, Frautschi, and Sharp, to include the effects of non-linear terms. Residue factorizability is used to transform an overdetermined set of equations into a variational problem, which is designed to take advantage of the redundancy of the mathematical system. The solution of this problem automatically satisfies the requirement of factorizability and comes close to satisfying all the original equations.

Part II investigates some consequences of direct channel Regge poles and treats the problem of relating Reggeized partial wave expansions made in different reaction channels. An analytic method is introduced which can be used to determine the crossed-channel discontinuity for a large class of direct-channel Regge representations, and this method is applied to some specific representations.

It is demonstrated that the multi-sheeted analytic structure of the Regge trajectory function can be used to resolve apparent difficulties arising from infinitely rising Regge trajectories. Also discussed are the implications of large collections of "daughter trajectories."

Two things are of particular interest: first, the threshold behavior in direct and crossed channels; second, the potentialities of Reggeized representations for us in self-consistent calculations. A new representation is introduced which surpasses previous formulations in these two areas, automatically satisfying direct-channel threshold constraints while being capable of reproducing a reasonable crossed channel discontinuity. A scalar model is investigated for low energies, and a relation is obtained between the mass of the lowest bound state and the slope of the Regge trajectory.

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A presente pesquisa investiga a produção de subjetividade em seminários católicos. Por meio de diversos teóricos, girando em torno do eixo conceitual da Análise Institucional (em sua vertente socioanalítica e, principalmente, esquizoanalítica), pesquisou-se um importante seminário católico diocesano na região Sudeste, um dos primeiros fundados no Brasil. Um seminário é a instituição de internato em que muitos homens vivem, estudam e trabalham, durante oito anos em média, para se tornarem padres. Nossa pesquisa de campo utilizou-se da observação participante, oriunda da antropologia e sociologia, em diversas visitas ao estabelecimento, durante as quais fomos autorizados a participar de todas as atividades dos 110 seminaristas internos. Em seguida, alguns seminaristas, de todas as etapas da formação, e todos os 5 padres formadores foram entrevistados. Recorremos a entrevistas abertas de história de vida, segundo os procedimentos da História Oral italiana. Guiados pela distinção da filosofia de Spinoza de três gêneros de conhecimento, buscamos dramatizar a formação clerical em três níveis de compreensão: os Signos ou afectos, as Noções ou conceitos, as Essências ou perceptos. Por meio dessa trajetória, constatamos o predomínio da dimensão do instituído e de uma modelização homogeneizadora de tipo romana, resultando em que os clérigos ali formados se fechem em uma identidade sacerdotal claramente identificável e encapsulada na obediência aos centros de poder eclesiais: a Cúria romana, a Mitra diocesana e a Paróquia. Busca-se, na formação, reproduzir a subjetividade serializada segundo um Modelo sacerdotal institucionalizado, no qual as dimensões litúrgica e disciplinar são ressaltadas, em detrimento das dimensões místico-políticas sendo a perseguição à Teologia da Libertação um importante analisador dessa característica. A constante vigilância da pureza doutrinal, litúrgica, organizacional e teológica indicou-nos a pressão em reprimir a dimensão místico-profética, que range, querendo se expressar. Em vista disso, bem como de inúmeros outros analisadores, conceitos e personagens produzidos ao longo da pesquisa, pudemos constatar que o desejo clerical, modulado na formação seminarística, oscila entre dois pólos: um pólo sacerdotal-romano-paranóico e um pólo profético-libertador-esquizo. No primeiro, há redução à identidade hegemônica nascida nos centros de poder eclesiais, fechando-se à diferença, na busca de um projeto de imortalidade frente às intempéries da vida e transformações da História, produzindo práticas hierárquicas a partir de um pensamento de caráter transcendente, representativo. No segundo pólo, há busca de singularização, nascida do seguimento a Jesus, o conseqüente compromisso com os menores e excluídos dentro e fora da Igreja e o processo inerente a esta produção de sentido, criando-se, em conseqüência, uma radical imanentização da vida cristã e de seus pólos e transcendências: material/espiritual, fé/vida, Igreja/Mundo, mística/política. O seminário pesquisado, indicador das transformações micropolíticas da Igreja contemporânea, produz hegemonicamente um desejo sacerdotal-romano-paranóico, forjando funcionários do poder da Igreja, burocratas do aparelho de Estado romano, aplicadores de suas rubricas litúrgicas e normas doutrinais e morais, e não profetas do Reino de Deus, máquinas de guerra libertadoras quanto a tudo o que oprime a potência da vida e suas inauditas expressões singulares.

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É descrita a modelagem, para controle, da dinâmica de uma plataforma semisubmersível com seis graus de liberdade. O modelo inclui os efeitos dos tanques de lastro como forças e momentos, assim como a dinâmica da plataforma. Os parâmetros do sistema foram obtidos das características da plataforma e de resultados experimentais obtidos com uma plataforma semisubmersível de dimensões reduzidas. O desenvolvimento de uma metodologia e de um software capazes de determinar o volume submerso e o centro de empuxo de uma estrutura com geometria complexa foram pontos determinantes nessa Dissertação, tendo em vista a complexidade do processo e as importâncias desses parâmetros para o desenvolvimento do modelo. A linearização do modelo permitiu a elaboração de uma estratégia de controle capaz de estabilizar a plataforma mesmo em condições iniciais distantes do equilíbrio. As equações que descrevem o movimento da plataforma nos graus de liberdade vertical, jogo e arfagem foram desenvolvidas. A realocação dos polos e um observador de estado foram utilizados com o objetivo de melhorar o controle do sistema.

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Bdellovibrio bacteriovorus are small, vibroid, predatory bacteria that grow within the periplasmic space of a host Gram-negative bacterium. The intermediate-filament (IF)-like protein crescentin is a member of a broad class of IF-like, coiled-coil-repeat-proteins (CCRPs), discovered in Caulobacter crescentus, where it contributes to the vibroid cell shape. The B. bacteriovorus genome has a single ccrp gene encoding a protein with an unusually long, stutter-free, coiled-coil prediction; the inactivation of this did not alter the vibriod cell shape, but caused cell deformations, visualized as chiselled insets or dents, near the cell poles and a general 'creased' appearance, under the negative staining preparation used for electron microscopy, but not in unstained, frozen, hydrated cells. Bdellovibrio bacteriovorus expressing 'teal' fluorescent protein (mTFP), as a C-terminal tag on the wild-type Ccrp protein, did not deform under negative staining, suggesting that the function was not impaired. Localization of fluorescent Ccrp-mTFP showed some bias to the cell poles, independent of the cytoskeleton, as demonstrated by the addition of the MreB-specific inhibitor A22. We suggest that the Ccrp protein in B. bacteriovorus contributes as an underlying scaffold, similar to that described for the CCRP protein FilP in Streptomyces coelicolor, preventing cellular indentation, but not contributing to the vibroid shape of the B. bacteriovorus cells.

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Trabalho de Projeto para obtenção do grau de Mestre em Engenharia Civil na Área de Especialização em Vias de Comunicação e Transportes