Complex Time Solutions with Nontrivial Topology and Multi Particle Scattering in Yang-Mills Theory

A classical solution to the Yang-Mills theory is given a new semiclassical interpretation in terms of particle scattering. It solves the complex time boundary value problem, which arises in the semiclassical approximation to a multi particle transition probability in the one-instanton sector at fixed energy. The imaginary part of the action of the solution on the complex time contour and its topological charge obey the same relation as the self-dual Euclidean configurations. Hence the solution is relevant for the problem of tunneling with fermion number violation in the electroweak theory. It describes transitions from an initial state with a smaller number of particles to a final state with a larger number of particles. The implications of these results for multi particle production in the electroweak theory are also discussed.Comment: 10 pgs. (LaTeX), JHU-TIPAC-93001

Um conto de três cidades: a Urbs; Ammaia, a colônia ex nihilo; e Conimbriga, a adaptação dos oppida lusitanos

When dealing with the analysis of the materiality of urban architecture in the Roman World, in the Imperial Period, seeking to understand the practices of occupation of spaces, both in the city of Rome and in the provinces, we deal with a material culture almost as broad as the Ancient World itself, if thinking of the geographic extent that the Empire has reached. Therefore, it is necessary, for research and didactic purposes, to establish spatial, temporal and material delimitations. It is also necessary to deal, specifically in the case of Lusitania, with the scarcity of available archaeological information. Although the new technologies available lead to advances in research and new challenges, as they raise new questions to be answered by the material culture, it is also necessary that these technologies be effectively applied to the territory of ancient Lusitania so that we can use them. In this work it is intended, through the study of the forums of two Roman provincial cities – Ammaia and Conimbriga (respectively, an ex nihilo foundation and an adaptation of a pre-Roman settlement), chosen to present distinct archaeological and archaeological research histories – try to determine some of the patterns of appropriation of colonial spaces by the Romans in Lusitania. Although the study of Roman Lusitania suffers from the limitation imposed by the scarcity of available and/or published archaeological data, it was possible to observe the existence of a pattern in the urbanization introduced by Rome in Lusitania, which is visible in the fora and other urban elements, pre-existing local urbanism.Quando tratamos da análise da materialidade da arquitetura urbana no Mundo Romano, no Período Imperial, buscando entender as práticas de ocupação dos espaços, tanto na cidade de Roma quanto nas províncias, lidamos com um universo material quase tão amplo quanto o próprio Mundo Antigo, se pensarmos na extensão geográfica que o Império atingiu. Faz-se necessário, portanto, para fins de pesquisa e didáticos, estabelecer delimitações, espaciais, temporais e materiais. Também é preciso lidar, especificamente no caso da Lusitania, com a escassez das informações arqueológicas disponíveis. Embora as novas tecnologias disponíveis propiciem avanços nas pesquisas e igualmente novos desafios, pois despertam novas questões a serem respondidas pela cultura material, é preciso também que tais tecnologias sejam efetivamente aplicadas ao território da antiga Lusitania para que possamos utilizá-las. Neste trabalho, pretende-se, através do estudo dos fóruns de duas cidades provinciais romanas – Ammaia e Conimbriga (respectivamente, fundações ex nihilo e adaptação de assentamento pré-romano), escolhidas por apresentarem histórias de implantação e de pesquisa arqueológica distintas – tentar determinar alguns dos padrões de apropriação dos espaços coloniais pelos romanos na Lusitania. Embora o estudo da Lusitania romana sofra pela limitação imposta pela escassez dos dados arqueológicos disponíveis e/ou publicados, foi possível observar a existência de um padrão na urbanização introduzida por Roma, que é visível nos fora e demais elementos urbanos, distinto do antigo urbanismo local pré-existente

Etude du mécanisme de transfert des flexions à la jonction poutre poteau dans les structures en portiques mixtes soumises à une action sismique

La présente thèse a pour objectif l’étude du mécanisme de transfert des flexions à la jonction poutre poteau dans les structures en portiques mixtes soumises à une action sismique, dans l'hypothèse où l'assemblage poutre poteau est de type pleinement résistant.La thèse contribue à la définition des éléments nécessaires pour effectuer un calcul sécuritaire de la résistance à l’action sismique des portiques mixtes. A l’heure actuelle, le chapitre relatifaux constructions mixtes dans l’Eurocode 8, basé en partie sur nos travaux, a été édité [prEN 1998-1-3 (2001)]. Notre contribution concerne les poutres mixtes avec dalle et leur jonction aux colonnes, pour le calcul desquelles notre travail établit un ensemble d'éléments d'information cohérents. Cependant, des études dans ce domaine restent utiles pour affiner les règles proposées et étendre leur applicabilité au cas des assemblages à résistance partielle.Rappelons d'abord le principe de base du projet parasismique, à savoir le « dimensionnement capacitif ». Lors d’un dimensionnement d’une structure soumise à forte sollicitation sismique, les éléments de la structure sont proportionnés de manière à réaliser une distribution des zones de dissipation d’énergie du séisme dans la structure selon un schéma choisi. Les zones deplastification forment un ensemble ne mettant pas en danger l’équilibre global de la structure. Cela correspond à ce qu'on appelle un « dimensionnement capacitif ». Dans ce contexte, il estprimordial de bien connaître la résistance de chaque élément pour être sûr que la ruine aura lieu là où on le désire. Dans un portique, on applique généralement le concept « poutre faible –colonne forte », c’est-à-dire que l’on désire que la dissipation d’énergie se fasse dans des rotules plastiques de poutres. Quelle différence existe-t-il entre les structures en acier et les structures mixtes ? Dans les structures en acier, les résistances des sections et des assemblages sont relativement bien contrôlées et il est aisé de hiérarchiser l’apparition des rotules plastiques. Dans les structures mixtes par contre, la contribution de la dalle au moment de flexion résistant de lapoutre est une quantité variable mal maîtrisée qui dépend de nombreux paramètres, tels le pourcentage d’armatures, la densité des connecteurs et la participation de la poutretransversale dans le schéma résistant. Il est très important de connaître l’effet de ces paramètres car ils influencent directement la capacité flexionnelle des poutres et, parconséquent, ils peuvent modifier l’ordre d’apparition des rotules plastiques entre les colonnes et les poutres et complètement mettre à mal le concept poutre faible – colonne forte.Le but général de notre thèse est de mettre en évidence et de quantifier le rôle de la dalle -et implicitement de ses composants, les armatures, les goujons connecteurs et la poutretransversale- dans le transfert de moment de flexion de la poutre à la colonne. L’objectif pratique est la définition de données utilisables par les auteurs de projet, telles que- des largeurs effectives à prendre en considération pour l’analyse des structures en portiques mixtes sous séisme et pour le calcul des résistances (moments plastiques) dessections- des éléments nécessaires à la définition des détails de connexion acier-béton et des armatures- l'implémentation de ces informations dans un format de règle de calcul, dans l'Eurocode 8

A origem provincial do Fórum de Trajano

The Trajan’s Forum has always been considered the ‘high point’ of the development of the Roman fora. The last of the Imperial Fora built in the centre of the Vrbs, during centuries it caused admiration to the visitors of the city, even when Rome was any more the capital of the Empire. Until some decades the scholars have considered it as the model for the provincial fora, specially in the European Occident. Nevertheless more recent works brought to light instances of contemporary canonic (tri-divided) fora or even elder than Trajan’s, putting down the notion that this kind of fora arose at Rome and then spread to the Empire. Actually it was a model, but not an initial one; it was indeed the highest degree of the canonic fora, the model followed in many provinces as from the 2nd century.O Fórum de Trajano sempre foi considerado o “ponto alto” do desenvolvimento dos fóruns romanos. Último fórum imperial erguido no centro da Vrbs, durante séculos impressionou os visitantes da cidade, mesmo quando Roma já não era o centro do Império. Até algumas décadas atrás, os estudiosos o consideravam como modelo para os fóruns provinciais, especialmente no Ocidente Europeu. Mas escavações mais recentes trouxeram à luz exemplos de fóruns tripartidos contemporâneos e mesmo anteriores ao de Trajano, derrubando a noção de que este tipo de fórum surgiu em Roma e difundiu-se para o Império. Ele realmente serviu como modelo, mas não como modelo inicial, e sim como o ápice dos fóruns tripartidos, modelo seguido em diversas províncias a partir do século II

Synthesis and Bulk Properties of poly(methylmethacrylate)-b-poly(isooctylacrylate)-b-poly(methylmethacrylate)

peer reviewe

PAPEL DO BIOMEDICO NA TERAPIA GENÉTICA A PARTIR DA REPROGRAMAÇÃO DAS CELULAS TRONCO

A terapia genética através da reprogramação das células-tronco é feita pela alteração das mesmas geneticamente. Para o tratamento que busca alterar o DNA, os cientistas precisam inserir um gene no núcleo da célula e fazer com que substitua outro. Elas costumam funcionar em testes com animais e em laboratório, mas quando transferidas para clínica, apresentam problemas. O tratamento acaba sendo abreviado por motivos de que algumas vezes os genes terapêuticos são produzidos em pouca quantidade ou por um curto período. Outras vezes apresenta-se o desenvolvimento do câncer. Esse estudo tem a meta de achar uma nova técnica que elimine a possibilidade da rejeição do organismo através da inserção dessas novas células que serão capazes de restaurar o sistema imunológico, produzindo corretamente essa nova proteína

The additional value of patient-reported health status in predicting 1-year mortality after invasive coronary procedures: A report from the Euro Heart Survey on Coronary Revascularisation

Objective: Self-perceived health status may be helpful in identifying patients at high risk for adverse outcomes. The Euro Heart Survey on Coronary Revascularization (EHS-CR) provided an opportunity to explore whether impaired health status was a predictor of 1-year mortality in patients with coronary artery disease (CAD) undergoing angiographic procedures. Methods: Data from the EHS-CR that included 5619 patients from 31 member countries of the European Society of Cardiology were used. Inclusion criteria for the current study were completion of a self-report measure of health status, the EuroQol Questionnaire (EQ-5D) at discharge and information on 1-year follow-up, resulting in a study population of 3786 patients. Results: The 1-year mortality was 3.2% (n = 120). Survivors reported fewer problems on the five dimensions of the EQ-5D as compared with non-survivors. A broad range of potential confounders were adjusted for, which reached a p<0.10 in the unadjusted analyses. In the adjusted analyses, problems with self-care (OR 3.45; 95% CI 2.14 to 5.59) and a low rating (≤ 60) on health status (OR 2.41; 95% CI 1.47 to 3.94) were the most powerful independent predictors of mortality, among the 22 clinical variables included in the analysis. Furthermore, patients who reported no problems on all five dimensions had significantly lower 1-year mortality rates (OR 0.47; 95% CI 0.28 to 0.81). Conclusions: This analysis shows that impaired health status is associated with a 2-3-fold increased risk of all-cause mortality in patients with CAD, independent of other conventional risk factors. These results highlight the importance of including patients' subjective experience of their own health status in the evaluation strategy to optimise risk stratification and management in clinical practice

African Linguistics in Central and Eastern Europe, and in the Nordic Countries

Non peer reviewe