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Search Results: 1 - 10 of 3918 matches for " áVILA "
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Determination of Volume Conductivity of Polyethylene Using Positive Corona, When the Current through the Sample Depends Linearly on Grid Potential  [PDF]
Pranvera Dhima, Floran Vila
Journal of Materials Science and Chemical Engineering (MSCE) , 2017, DOI: 10.4236/msce.2017.512004
Abstract: In this paper we determine for the first time the volume conductivity of polyethylene (of 40 μm and 50 μm thickness), using the positive corona triode. A general theory of flowing of the current through the sample, when it depends linearly on the grid potential, is formulated. A concrete methodology for the definition of volume conductivity is composed. The volume conductivity of polyethylene lies within the interval: \"\". These results obtained using the corona triode are closely similar to those obtained using the standardized “static” methods, thus showing its superiority to the “dynamic” method of electronic radiation.
Determination of Volume Conductivity of Thin Polymeric Films Using Corona Triode, When the Current through the Sample Depends Quadratically on Grid Potential  [PDF]
Pranvera Dhima, Floran Vila
Advances in Materials Physics and Chemistry (AMPC) , 2018, DOI: 10.4236/ampc.2018.86019
Abstract: In this paper is determined the volume conductivity of thin polymeric films using the corona triode method, when the current through the sample exhibits a quadratic dependence on the grid potential. Based on the experimental data, for the first time, an effective methodology for the determination of volume conductivity, graphically and analytically, is composed. The results obtained by the proposed analytical formula, for polypropylene and Trespaphan, with two different configurations of structures, are closely similar to the graphical method results. In addition, the satisfying accordance of our results, with the results, found out with the consulted literature, obtained by the “static” methods, confirms the accuracy of the proposed methodology, for the determination of volume conductivity of thin polymeric films, using the corona triode.
Effect of Polarity on Volume Conductivity of Polymers, Determined by Corona Triode Method  [PDF]
Pranvera Dhima, Floran Vila
Advances in Materials Physics and Chemistry (AMPC) , 2018, DOI: 10.4236/ampc.2018.810026
In this paper, the effect of polarity on the volume conductivity of Kapton and polyethylene (PE), determined using the corona triode method, when the sample current depends linearly on grid potential, was studied. For the determination of volume conductivity, in addition to the analytical method, for the first time, a graphical method is presented as well. According to the experimental results, obtained by both methods, the volume conductivity values of negative corona charged samples were higher than those of the samples charged by positive corona. Considering the different nature of positive and negative coronas, these differences in results are to be expected and are in full accordance with the theoretical considerations as well. On the other hand, the good agreement between the analytical method results and those obtained by the graphical method, indicates high accuracy of the proposed analytical formula. Meanwhile, the satisfying accordance of experimental results with those found by the classical “static” and “dynamic” methods, confirms the accuracy of the corona method, for the determination of volume conductivity of polymers.
Discusiones Filosóficas , 2006,
Abstract: this paper is a rejoinder to professor pablo arango's criticisms. it is argued, mainly, that even arango's observations to the contrary, essentialism cannot face an interesting version of conceptual relativity, that the argument that goes from rigid designation to essentialism is not conclusive, and that essentialist metaphysics violates the principle of substitutivity of correferring terms.
Los profesores y los decimales: Conocimientos y creencias acerca de un contenido de saber cuasi invisible
ávila, Alicia;
Educación matemática , 2008,
Abstract: this article analyzes the knowledge and beliefs a group of 25 elementary school teachers has about decimal numbers and their link with mexican reforms in mathematics at the end of the 20th century. the analysis is based on data collected from questionnaires, interviews, and opinions expressed in a workshop for fifth and sixth grade teachers, with the former in preponderance. the results show that, despite the mathematical and functional importance decimals have, these numbers constitute a quasi-invisible content in primary education, because the teachers' main concerns and actions center on how to write using "the point" minimizing and even excluding attention to the conceptual aspects of these numbers. it also offers decisive evidence that their knowledge of the math and teaching technique of decimals is quite limited, which sheds light on the approaches observed and the likelihood that the curricular innovation they are involved in will be overlooked unless institutional conditions are overhauled.
Un universo de formas, colores y pinturas: Caracterización del estilo alfarero yavi de la puna nororiental de Jujuy
Intersecciones en antropolog?-a , 2008,
Abstract: in this paper the yavi ceramic style from the northeastern puna of jujuy, argentina, is systematized and analyzed. the goal is to offer a characterization of the morphological, chromatic, and pictographic variation that this style presents. the study is based on the analysis of over two hundred whole vessels that belong to this style. these are distributed across various museums and collections in different parts of argentina. the study aims to establish which attributes should be included to classify a vessel as yavi and how these are combined in order to define the perceptive unity that characterizes the style.
El radicalismo republicano en Hispanoamérica: un balance historiográfico y una propuesta de estudio
ávila, Alfredo;
Estudios de historia moderna y contemporánea de México , 2011,
Abstract: after independence, latin american countries faced similar problems yet also had similar expectations. from the river plate to mexico, through colombia and central america, thinkers and political leaders thought that the time had come to eradicate colonial habits and transform society. this article describes the simultaneity of these processes, as a result of which the author proposes that it is actually the same process, which took place between 1820 and 1830. however, changing the habits and political culture of society is no easy task. anti-reform movements overturned nearly all the measures promoted by the generation of politicians led by bernardino rivadavia, francisco de paula de santander, mariano gálvez, and valentín gómez farías.
Boletín del Museo Chileno de Arte Precolombino , 2011, DOI: 10.4067/S0718-68942011000200007
Abstract: color is one of the ways in which the world (people, places, things) is consciously incorporated into social practice. currently, color variation is most commonly treated in archaeology on the basis of munsell color chart measurements or physical and chemical analyses of pigments. however, if our goal is to reincorporate color into human experience, then we must analyze it in connection with the role it plays in real-life situations. we will therefore examine the perceptual phenomena produced by relations among colors and use these to propose new methodological tools for analyzing archaeological materials.
Resultados da reabilita??o neuropsicológica em paciente com doen?a de Alzheimer leve
ávila, Renata;
Revista de Psiquiatria Clínica , 2003, DOI: 10.1590/S0101-60832003000400004
Abstract: traditionally, alzheimer's support and information groups have been developed for families and caregivers rather than for the actual patient. however, this reality is changing because of the increase in early ad diagnosis. the demand for medication and behavioral treatment for patients is also increasing. the purpose of this case report is to describe the neuropsychological rehabilitation (nr) of a mild ad patient in group and in individual sessions. first, cgp took part in two nr groups each for a 4 month period, and then started individual nr sessions for a 22 month period. in the sessions, memory and language abilities were the focus of the nr as well as the activities of daily living. during this period it was possible to observe positive changes in mmse score, as will as preservation of other cognitive function scores. this single case study is in agreement of previous studies which also showed documented positive effects of nr with ad patients.
A retina no século XXI
ávila Marcus
Arquivos Brasileiros de Oftalmologia , 2003,
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