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The aim of this dissertation was to explain why some people are indecisive, in the broadest sense of the term. First, a behavioral definition of indecisiveness was synthesized from the range of conceptions of indecision and indecisiveness found across different literatures. Indecisive behaviors were derived from the synthesized definition and used to develop a multi-dimensional, behavioral self-report scale. The scale was designed to capture the breadth of indecisive behaviors, without a priori attributing to them any causes. In three studies, the scale was developed, refined, validated, and used to test distinct mechanisms underlying indecisiveness. In Study 1 (N = 369), the initial scale was developed. Four types of indecisiveness were hypothesized to exist at distinct phases in the decision-making process: 1) before commitment, 2) ...
We study the anisotropic two-dimensional Hubbard model at and near half filling within a functional renormalization group method, focusing on the structure of momentum-dependent correlations which grow strongly upon approaching a critical temperature from above. We find that a finite nearest-neighbor interchain hopping is not sufficient to introduce a substantial momentum dependence of single-particle properties along the Fermi surface. However, when a sufficiently large second-nearest neighbor inter-chain hopping is introduced, the system is frustrated and we observe the appearance of so-called "hot spots", specific points on the Fermi surface around which scattering becomes particularly strong. We compare our results with other studies on quasi-one-dimensional systems.
Comment: 9 pages, preprint LPTENS 94/13
Les canaux potassiques voltage-dépendants forment des tétramères dont chaque sous-unité comporte six segments transmembranaires (S1 à S6). Le pore, formé des segments S5-S6 de chaque sous-unité, est entouré de quatre domaines responsables de la sensibilité au potentiel membranaire, les senseurs de voltage (VS; S1-S4). Lors d’une dépolarisation membranaire, le mouvement des résidus chargés situés dans le VS entraine un mouvement de charges détectable en électrophysiologie, le courant de « gating ». L’activation du VS conduit à l'ouverture du pore, qui se traduit par un changement de conformation en C-terminal du segment S6. Pour élucider les principes qui sous-tendent le couplage électromécanique entre ces deux domaines, nous avons étudié deux régions présumées responsables du couplage chez les canaux de type Shaker K+, soit la région ...
On se plait parfois à dire que la géologie, du fait de son objet, est une science globale. Dans le cadre de l'Histoire des Sciences, la place de l'histoire de la Géologie est également à l'échelle mondiale. (...)
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