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Desigualdades na divis?o do trabalho familiar, sentimento de justi?a e processos de compara??o social
Poeschl,Gabrielle;
Análise Psicológica , 2010,
Abstract: the studies conducted on family organization have shown that, in spite of the mass entry of women into the labour market, there have been only few changes in the way spouses divide the family work. as a result, unequal family practices are maintained in societies based on an egalitarian ethics without, paradoxically, producing a feeling of injustice. this observation has been at the origin of several attempts of explanation, one of those being that the comparisons made by women are selective and lead them to view the unequal division of family work as appropriate. the present paper questions this explanation and attempts to show that most comparisons between men and women lead to evaluate similar behaviours in a different way, because they are adjusted to the traditional gender roles and thus rest on double standards. it defends that using identical criteria for the judgments of men and women’s competences and roles is an indispensable condition to achieve more justice in our society.
B-Spline Finite Elements and their Efficiency in Solving Relativistic Mean Field Equations
W. Poeschl
Physics , 1998, DOI: 10.1016/S0010-4655(98)00003-4
Abstract: A finite element method using B-splines is presented and compared with a conventional finite element method of Lagrangian type. The efficiency of both methods has been investigated at the example of a coupled non-linear system of Dirac eigenvalue equations and inhomogeneous Klein-Gordon equations which describe a nuclear system in the framework of relativistic mean field theory. Although, FEM has been applied with great success in nuclear RMF recently, a well known problem is the appearance of spurious solutions in the spectra of the Dirac equation. The question, whether B-splines lead to a reduction of spurious solutions is analyzed. Numerical expenses, precision and behavior of convergence are compared for both methods in view of their use in large scale computation on FEM grids with more dimensions. A B-spline version of the object oriented C++ code for spherical nuclei has been used for this investigation.
Jets and Event Shape Studies in ep-collisions at HERA
Roman Poeschl
Physics , 2001,
Abstract: The results of complementary tests of perturbative QCD in DIS at large centre-of-mass energies at HERA are presented. The analysis of event shape variables allows for the investigation of approaches to understand aspects of non-perturbative QCD such as the formation of the hadronic final state. The strong coupling constant, $\alpha_s$, is extracted from both inclusive jet cross sections and dijet rates and is found to be competitive with the world average.
Jets in Deep-Inelastic Scattering at HERA and determinations of $α_s$
Roman Poeschl
Physics , 2004,
Abstract: Several methods to extract the strong coupling constant $\alpha_s$ by means of highly energetic jets in Deep-Inelastic Scattering are presented. The results from the various methods agree with one another and with the world average. The errors are competetive to those achieved in $\alpha_s$ determinations in other processes such as proton--anti-proton scattering.
Ancoragens e varia??es nas representa??es sociais da corrup??o
Poeschl,Gabrielle; Ribeiro,Raquel;
Análise Social , 2010,
Abstract: in this paper, we examine the representations of corruption of portuguese respondents and attempt to identify variations according to different social groups and to the general, global, or national contexts in which the phenomenon is considered. we found that ?corruption, in general?, is represented by practices and motives that reflect a moral judgment, and by illegal groups and activities, as is also the case for corruption at the global level. corruption at the global level also has a geopolitical dimension, whereas corruption at the national level is seen in a particularized way, highlighting cases and situations often debated in the media.
Ancoragens e varia es nas representa es sociais da corrup o Anchoring and variations in the social representations of corruption
Gabrielle Poeschl,Raquel Ribeiro
Análise Social , 2010,
Abstract: Examinam-se neste artigo as representa es da corrup o de inquiridos portugueses e procuram-se identificar varia es consoante os grupos sociais e os contextos geral, global ou nacional em que o fenómeno é considerado. Verificou-se que a “corrup o em geral” é representada por práticas e motivos que reflectem um julgamento moral e por grupos e actividades ilegais, tal como acontece em rela o à corrup o ao nível global. Esta tem ainda uma dimens o geopolítica, enquanto a corrup o ao nível nacional é entendida de forma particularizada, real ando-se casos e situa es específicas muitas vezes divulgados pelos media. In this paper, we examine the representations of corruption of Portuguese respondents and attempt to identify variations according to different social groups and to the general, global, or national contexts in which the phenomenon is considered. We found that “corruption, in general”, is represented by practices and motives that reflect a moral judgment, and by illegal groups and activities, as is also the case for corruption at the global level. Corruption at the global level also has a geopolitical dimension, whereas corruption at the national level is seen in a particularized way, highlighting cases and situations often debated in the media.
Gluon Field Dynamics in Ultra-Relativistic Heavy-Ion Collisions: Time evolution on a Gauge Lattice in 3+1 Dimensions
W. Poeschl,B. Mueller
Physics , 1998,
Abstract: We describe the dynamics of gluons and quarks in a relativistic nuclear collision, within the framework of classical mean-field transport theory, by the coupled equations for the classical Yang-Mills field and a collection of colored point particles. The particles represent the valence quarks in the colliding nuclei. We explore the time evolution of the gauge field in a numerical simulation of the collision of two Lorentz-boosted ``nuclei'' on a long three-dimensional gauge lattice. We report first results on soft gluon scattering and coherent gluon radiation.
Real Time Dynamics of Colliding Gauge Fields and the ''Glue Burst''
W. Poeschl,B. Mueller
Physics , 1998, DOI: 10.1103/PhysRevD.60.114505
Abstract: The Yang Mills equations provide a classical mean field description of gauge fields. In view of developing a coherent description of the formation of the quark gluon plasma in high energetic nucleus-nucleus collisions we study pure gauge field dynamics in 3+1 dimensions. In collisions of wave packets, numerically simulated on a SU(2) gauge lattice, we study transverse and longitudinal energy currents. For wave packets with different polarizations in color space, we observe a time delayed fragmentation after the collision resulting in a rapid expansion into transverse directions. We call this phenomenon the ''glue burst''. An analysis of the Yang Mills equations reveals the explanation for this behavior. We point out that this effect could play a role in ultra-relativistic heavy-ion collisions.
Coherent noise source identification in multi channel analysis
Thibault Frisson,Roman Poeschl
Physics , 2014,
Abstract: The evaluation of coherent noise can provide useful information in the study of detectors. The identification of coherent noise sources is also relevant for uncertainty calculations in analyse where several channels are combined. The study of the covariance matrix give information about coherent noises. Since covariance matrix of high dimension data could be difficult to analyse, the development of analysis tools is needed. Principal Component Analysis (PCA) is a powerful tool for such analysis. It has been shown that we can use PCA to find coherent noises in ATLAS calorimeter or the CALICE Si-W electromagnetic calorimeter physics prototype. However, if several coherent noise sources are combined, the interpretation of the PCA may become complicated. In this paper, we present another method based on the study of the covariance matrix to identify noise sources. This method has been developed for the study of front end ASICs dedicated to CALICE calorimeters. These calorimeters are designed and studied for experiments at the ILC. We also study the reliability of the method with simulations. Although this method has been developped for a specific application, it can be used for any multi channel analysis.
Gauge Lattice Simulation of the soft QGP Dynamics in Ultra-Relativistic Heavy-Ion Collisions
W. Poeschl,B. Mueller
Physics , 1998,
Abstract: In a fully relativistic approach, a RLSM description of nuclei colliding at ultra-relativistic energies can be formulated within the framework of a classical transport theory. The valence quarks of the nucleons are described through collections of classical point-like particles moving in the continuum. They are coupled to soft gluon fields which are described through the Yang Mills equations on a gauge lattice. In a first step, we focus on the range of low-$p_t$ interactions. Results from numerical model simulations of pure gluonic nucleus-nucleus collisions on SU(2) gauge lattices in 3+1 dimensions are presented. They show an effect which we call the glue burst.
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