Search results for "SIM"
showing 10 items of 10139 documents
Noise influence on electron dynamics in semiconductors driven by a periodic electric field
2008
Studies about the constructive aspects of noise and fluctuations in different non-linear systems have shown that the addition of external noise to systems with an intrinsic noise may result in a less noisy response. Recently, the possibility to reduce the diffusion noise in semiconductor bulk materials by adding a random fluctuating contribution to the driving static electric field has been tested. The present work extends the previous theories by considering the noise-induced effects on the electron transport dynamics in low-doped n-type GaAs samples driven by a high-frequency periodic electric field (cyclostationary conditions). By means of Monte Carlo simulations, we calculate the change…
Unitary units and skew elements in group algebras
2003
Let FG be the group algebra of a group G over a field F and let * denote the canonical involution of FG induced by the map g→g −1 ,gG. Let Un(FG)={uFG|uu * =1} be the group of unitary units of FG. In case char F=0, we classify the torsion groups G for which Un(FG) satisfies a group identity not vanishing on 2-elements. Along the way we actually prove that, in characteristic 0, the unitary group Un(FG) does not contain a free group of rank 2 if FG − , the Lie algebra of skew elements of FG, is Lie nilpotent. Motivated by this connection we characterize most groups G for which FG − is Lie nilpotent and char F≠2.
Generation of Certain Matrix Groups by Three Involutions, Two of Which Commute
1997
Ž . We say that a group is 2, 2 = 2 -generated if it can be generated by three involutions, two of which commute. The problem of determining Ž . which finite simple groups are 2, 2 = 2 -generated was posed by Mazurov w x in 1980 in the Kourovka notebook 3 . An answer to this problem, for some classes of finite simple groups, was given by Ya. N. Nuzhin, namely for w x Chevalley groups of rank 1 in 4 , for Chevalley groups over a field of w x characteristic 2 in 5 , and for the alternating groups and Chevalley groups w x of type A in 6 . In this paper we consider the problem in the more n general context of matrix groups over arbitrary, finitely generated, commutative rings. As a special case…
Producer's spatial equilibrium with a fuzzy constraint
1980
The classical theory of the producer’s equilibrium rests on two sets of particularly restrictive hypotheses. First it is implicitely assumed that all inputs and outputs are located in a single place where the producer is also implanted and where the production is carried out. Next it is assumed that the producer follows a precise behaviour pattern, by this we mean that the producer has complete information concerning the conditions of hisproductive activity and he has perfect command over both the set of inputs and the set of outputs; he realises the maximum profit allowed by the technological constraint which limits his possible actions and by the given price system. The aim of this study …
What happens at the lesson start?
2016
AbstractTransitional periods, such as lesson starts, are necessary steps from one activity to another, but they also compete with time for actual learning. The aim of the present study was to replicate a previous pilot study on lesson starts and explore possible disturbances. In total, 130 lesson starts in Finnish basic education in grades 1–9 were studied using systematic observation performed by 79 preservice teachers. The results corresponded with a previous pilot study indicating that lesson starts were generally orderly and teachers used effective means to manage events. However, lessons started 5 min late on average. Male teachers were evaluated to have better classroom order than fem…
ASIMMETRIE INFORMATIVE E TUTELA DELLA TRASPARENZA NELLA POLITICA COMUNITARIA DI CONSUMER PROTECTION:LA RISPOSTA DELLA NORMATIVA SULLE CLAUSOLE ABUSIVE
2000
L'autore propone una ricostruzione della normativa sulle clausole abusive e del ruolo della trattativa individuale, muovendo dall'identificazione della ratio di tutela in termini di tutela del mercato e dalla valorizzazione del principio di trasparenza e di quello di buona fede, qual criteri di accertamento della vessatorietà, intesa come ipotesi di asimmetria informativa.
Assessing the impact of copy number variants on miRNA genes in autism by Monte Carlo simulation.
2014
Autism Spectrum Disorders (ASDs) are childhood neurodevelopmental disorders with complex genetic origins. Previous studies have investigated the role of de novo Copy Number Variants (CNVs) and microRNAs as important but distinct etiological factors in ASD. We developed a novel computational procedure to assess the potential pathogenic role of microRNA genes overlapping de novo CNVs in ASD patients. Here we show that for chromosomes # 1, 2 and 22 the actual number of miRNA loci affected by de novo CNVs in patients was found significantly higher than that estimated by Monte Carlo simulation of random CNV events. Out of 24 miRNA genes over-represented in CNVs from these three chromosomes only …
The assimilation of problematic experiences in the context of a therapeutic failure
2006
Abstract A negative case–a therapeutic dropout–was analyzed with the Assimilation of Problematic Experiences Scale (APES). The APES has been devised from the assimilation model developed by Stiles and colleagues, and it has proven useful for describing the process of change. The APES describes assimilation as a sequence of eight stages which range from an experience being warded off, through being avoided, in vague awareness, then clarified, understood and solutions applied and finally, resolved and integrated into the self. The current study focuses on the case of Ana, who was being treated for reactive depression in five sessions of linguistic therapy of evaluation. The aims of this study…
El Estudio del Proceso del Cambio según el Modelo de Asimilación: Una Introducción Teórica y Metodológica
2011
Con este trabajo se busca la descripción teórica y metodológica del modelo de asimilación y de algunos de los principales resultados. El modelo de asimilación se ha desarrollado como un modelo de procesos integrador que permite describir el proceso de cambio en cualquier enfoque de terapia. Este trabajo describe el modelo y cómo debe ser el procedimiento a seguir cara al desarrollo de estudios de asimilación. Define, además, sus conceptos principales, como asimilación, voces dominantes y no dominantes y puente de significado y se presenta la Escala de Asimilación de Experiencias Problemáticas (APES). Se resumen algunos de los principales resultados alcanzados, como por ejemplo, la relación …
Adaptive trial design: a general methodology for censored time to event data.
2008
Adaptive designs allow a clinical trial design to be changed according to interim findings without inflating type I error. The Inverse Normal method can be considered as an adaptive generalization of classical group sequential designs. The use of the Inverse Normal method for censored survival data was demonstrated only for the logrank statistic. However, the logrank statistic is inefficient in the presence of nuisance covariates affecting survival. We demonstrate, how the Inverse Normal method can be applied to Cox regression analysis. The required independence between test statistics of the different stages of the trial can be obtained by two different approaches. One is using the indepen…