2,561 research outputs found

    Uma abordagem para o in√≠cio da "vida universit√°ria": a relev√Ęncia das liga√ß√Ķes de pares em estudantes imigrantes durante a... transfer√™ncia para a vida adulta?

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    El trabajo realiza, desde el campo sub-disciplinar de la Antropolog√≠a y Educaci√≥n, un acercamiento a la inserci√≥n de estudiantes inmigrantes a la ‚Äúvida universitaria‚ÄĚ. En este sentido, se pone en discusi√≥n los sentidos -vinculados al mundo de la adultez- que se producen desde la instituci√≥n durante la inserci√≥n de los estudiantes analizando este proceso de traspaso a trav√©s del enfoque etnogr√°fico. Adem√°s, se hace referencia a los v√≠nculos de los estudiantes inmigrantes puntualizando en la redefinici√≥n con el lugar de origen y la relevancia que asumen los v√≠nculos de pares al convertir la experiencia en un fen√≥meno colectivo. La informaci√≥n se relev√≥ a partir de dos estrategias de investigaci√≥n: la observaci√≥n participante y la entrevista. La poblaci√≥n de estudio estuvo constituida por estudiantes inmigrantes que ingresaron a la Facultad de Ciencias Sociales de la UNICEN (Prov. de Buenos Aires - Argentina) durante el 2013.The paper does, from the field of anthropology and education, a closer look to the insertion of immigrant students to the ‚Äúuniversity life‚ÄĚ. With this porpouse, the senses related to the grown-up world which are created inside the institution during the insertion of the students analyzing this transfer process from the ethnographic point of view. Besides, reference will be maid the connections between foreigner students particularly making reference to the redefinition with their home country and the relevance of the links with their pairs. The information was revealed from two strategies of research: participant observation and interviews. The poblation studied was constituted by immigrant students who entered to the Facultad de Ciencias Sociales of the UNICEN (Prov. of Buenos Aires - Argentina) during 2013.O trabalho realiza, desde o campo da Antropologia e Educa√ß√£o, um acercamento a inser√ß√£o de estudantes inmigrantes a ‚Äúvida universit√°ria‚ÄĚ. Em este sentido, se ficam em discuss√£o os sentidos ‚Äď vinculados ao mundo dos adultero- que se produzem desde a institui√ß√£o durante a inser√ß√£o de os estudantes analisando este processo de traspasso atrav√©s do enfoque etnogr√°fico. Ademais, se faze referencia a os v√≠nculos de os estudantes inmigrantes concretizando em a defini√ß√£o com o lugar de origem e a relev√Ęncia que assumem os v√≠nculos de pares ao converter a experi√™ncia em um fen√īmeno coletivo. A informa√ß√£o releva-se a partir de duas estrat√©gias de investiga√ß√£o: a observa√ß√£o participante e a pesquisa. A popula√ß√£o de estudo estiva constitu√≠da por estudantes inmigrantes que ingressaram a Faculdade de Ci√™ncias Sociais da UNICEN (Prov. De Buenos Aires-Argentina) durante o 2013.Fil: Pallicer, Rodrigo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Sociales. Nucleo Regional de Estudios Socioculturales; ArgentinaFil: Tevez, Emilio Jos√©. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Sociales. Nucleo Regional de Estudios Socioculturales; Argentina. Consejo Nacional de Investigaciones Cient√≠ficas y T√©cnicas. Centro Cient√≠fico Tecnol√≥gico Tandil; Argentin

    Bortezomib: A New Promising Therapy for Early Antibody-Mediated Rejection After Liver Transplantation?

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    Airplane design; a must in aeronautical engineering education

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    The trend towards European academic homogenisation, budget cuts and other threats lead to shrinking the time for the aeronautical engineering programs. Some topics, knowledge and skills will have no place in future curricula. The paper advocates for keeping airplane design as a corner stone of the aeronautical engineering syllabi since it is the only topic that educates students in synthesis perspective, binds many independent disciplines and counterbalances18 years of well developed analytical mentality

    Asignación de frecuencias en redes móviles GSM utilizando Meta Heurí­stica ACO

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    En ¬† este trabajo de investigaci√≥n se analiza un problema real de las redes de telecomunicaciones, nos proponemos aplicar t√©cnicas meta heur√≠¬≠sticas a problemas de asignaci√≥n de frecuencias, utilizando el algoritmo Ant System (AS) en escenarios que simulan ¬† una red celular GSM. ¬†La industria de las telecomunicaciones ha proporcionado, y sigue proporcionando, una gran cantidad de problemas de optimizaci√≥n que surgen desde el propio dise√Īo del sistema de comunicaci√≥n hasta algunos aspectos de su funcionamiento y aqu√≠¬≠ entran los procedimientos meta heur√≠¬≠sticos que son una clase de m√©todos aproximados que est√°n dise√Īados para resolver problemas complejos de optimizaci√≥n, en los que los heur√≠¬≠sticos cl√°sicos no son efectivos. Los meta-heur√≠¬≠sticos proporcionan un marco general para crear nuevos algoritmos h√≠¬≠bridos combinando diferentes conceptos derivados de la inteligencia artificial. ¬†Con todo esto se quiere llegar a una modelaci√≥n matem√°tica de ¬† Optimizaci√≥n basada en algoritmos de hormigas (ACO) para asignaci√≥n de frecuencias

    Statistical and kinetic study for leaching of covellite in a chloride media

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    Covellite is a relatively rare copper sulfide with slow dissolution kinetics. The present investigation used the surface optimization methodology to evaluate the effect of three independent variables (time, chloride concentration and sulfuric acid concentration) on the rate of extracting Cu from covellite. The effects of chloride concentration and temperature over time were also studied. An ANOVA indicated that the linear variables of time and chloride concentration have the greatest influence, this being highly representative (R2 = 0.9945). The highest copper extraction rate (71.23%) at room temperature, was obtained with a high chloride concentration (100 g/L), a low concentration of sulfuric acid (0.5 M), and a leaching period of 600 h. The dissolution is described by the model of the unreacted core, the rate of leaching of the covellite is controlled by the chemical surface reaction at temperatures between 50 and 90¬įC, with concentrations of 0.5 M of H2SO4, 100 g/L of chloride, and a leaching period of up to 6 hours, where an activation energy of 72.36 kJ/mol was obtaine.The authors are grateful for the contribution of the Scientific Equipment Unit-MAINI of the Universidad Cat√≥lica del Norte for aiding in generating data by automated electronic microscopy QEMSCAN¬ģ and for facilitating the chemical analysis of the solutions. We are also grateful to Marina Vargas Aleuy and Carolina Ossand√≥n Cort√©s of the Universidad Cat√≥lica del Norte for supporting the experimental tests

    Development of an analytical model for the extraction of manganese from marine nodules

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    Multivariable analytical models provide a descriptive (albeit approximate) mathematical relationship between a set of independent variables and one or more dependent variables. The current work develops an analytical model that extends a design of experiments for the leaching of manganese from marine nodules, using sulfuric acid (H2SO4) in the presence of iron-containing tailings, which are both by-products of conventional copper extraction. The experiments are configured to address the effect of time, particle size, acid concentration, Fe2O3/MnO2 ratio, stirring speed and temperature, under typical industrial conditions. The recovery of manganese has been modeled using a first order differential equation that accurately fits experimental results, noting that Fe2O3/MnO2 and temperature are the most critical independent variables, while the particle size is the least influential (under typical conditions). This study obtains representative fitting parameters, that can be used to explore the incorporation of Mn recovery from marine nodules, as part of the extended value chain of copper sulfide processing.The authors are grateful for the contribution of the Scientific Equipment Unit- MAINI of the Universidad Cat√≥lica del Norte for aiding in generating data by automated electronic microscopy QEMSCAN¬ģ, and for facilitating the chemical analysis of the solutions. We are also grateful to the Altonorte Mining Company for supporting this research and providing slag for this study, and we thank Marina Vargas Aleuy, Mar√≠a Barraza Bustos and Carolina Ossand√≥n Cort√©s of the Universidad Cat√≥lica del Norte for supporting the experimental tests

    Control evaluation in a LVoD system based on a peer-to-peer multicast scheme

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    Providing Quality of Service (QoS) in video on demand systems (VoD) is a challenging problem. In this paper, we analyse the fault tolerance on a P2P multicast delivery scheme, called Patch Collaboration Manager / Multicast Channel Distributed Branching (PCM/MCDB) [13]. This scheme decentralizes the delivery process between clients and scales the VoD server performance. PCM/MCDB synchronizes a group of clients in order to create local network channels to replace on-going multicast channels from the VoD server. Using the P2P paradigm supposes facing the challenge of how often peers connect and disconnect from the system. To address this problem, a centralized mechanism is able to replace the failed client. We evaluate the failure management process of the centralized scheme in terms of the overhead injected into the network and analyse the applicability of a distributed approach to managing the process. Analytical models are developed for centralized and distributed approaches. Their behaviour are compared in order to evaluate whether the distributed scheme can improve the fault management process, in terms of reducing server load and generating better scalability.Proporcionar Calidad de Servicio (QoS) en sistemas de Vídeo bajo Demanda (VoD) es un problema desafiador. En este artículo, analizamos la tolerancia a fallos en un esquema de envío de informaciones, basado en comunicaciones multicast y colaboraciones P2P, denominado PCM/MCDB [13]. El esquema descentraliza el proceso de envío de información entre los clientes y escala las prestaciones del servidor de VoD. PCM/MCDB sincroniza un grupo de clientes con objeto de crear canales de redes locales para reemplazar canales multicast en curso del servidor. La aplicación del paradigma P2P supone cómo afrontar el problema de la conexión y desconexión de clientes del sistema. Para resolver este problema, un mecanismo centralizado es capaz de reemplazar el cliente fallido. En el trabajo evaluamos el proceso de gestión de fallos del esquema centralizado en términos del flujo de informaciones insertado en la red y analizamos la aplicabilidad de un esquema distribuido para el proceso de gestión. Modelos analíticos son desarrollados para las aproximaciones centralizada y distribuida. Sus comportamientos son comparados con objeto de evaluar si un esquema distribuido puede mejorar el proceso de gestión de fallos desde el punto de vista de reducir la carga del servidor y proporcionar mejor escalabilidad.VIII Workshop de Procesamiento Distribuido y ParaleloRed de Universidades con Carreras en Informática (RedUNCI

    Control evaluation in a LVoD system based on a peer-to-peer multicast scheme

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    Providing Quality of Service (QoS) in video on demand systems (VoD) is a challenging problem. In this paper, we analyse the fault tolerance on a P2P multicast delivery scheme, called Patch Collaboration Manager / Multicast Channel Distributed Branching (PCM/MCDB) [13]. This scheme decentralizes the delivery process between clients and scales the VoD server performance. PCM/MCDB synchronizes a group of clients in order to create local network channels to replace on-going multicast channels from the VoD server. Using the P2P paradigm supposes facing the challenge of how often peers connect and disconnect from the system. To address this problem, a centralized mechanism is able to replace the failed client. We evaluate the failure management process of the centralized scheme in terms of the overhead injected into the network and analyse the applicability of a distributed approach to managing the process. Analytical models are developed for centralized and distributed approaches. Their behaviour are compared in order to evaluate whether the distributed scheme can improve the fault management process, in terms of reducing server load and generating better scalability.Proporcionar Calidad de Servicio (QoS) en sistemas de Vídeo bajo Demanda (VoD) es un problema desafiador. En este artículo, analizamos la tolerancia a fallos en un esquema de envío de informaciones, basado en comunicaciones multicast y colaboraciones P2P, denominado PCM/MCDB [13]. El esquema descentraliza el proceso de envío de información entre los clientes y escala las prestaciones del servidor de VoD. PCM/MCDB sincroniza un grupo de clientes con objeto de crear canales de redes locales para reemplazar canales multicast en curso del servidor. La aplicación del paradigma P2P supone cómo afrontar el problema de la conexión y desconexión de clientes del sistema. Para resolver este problema, un mecanismo centralizado es capaz de reemplazar el cliente fallido. En el trabajo evaluamos el proceso de gestión de fallos del esquema centralizado en términos del flujo de informaciones insertado en la red y analizamos la aplicabilidad de un esquema distribuido para el proceso de gestión. Modelos analíticos son desarrollados para las aproximaciones centralizada y distribuida. Sus comportamientos son comparados con objeto de evaluar si un esquema distribuido puede mejorar el proceso de gestión de fallos desde el punto de vista de reducir la carga del servidor y proporcionar mejor escalabilidad.VIII Workshop de Procesamiento Distribuido y ParaleloRed de Universidades con Carreras en Informática (RedUNCI
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