2,326 research outputs found
The ALICE TPC
No full textWe describe the ALICE TPC, with emphasis on the design features which are driven by the physics requirements of the detector. In particular, the gas choice and composition, Ne-CO/sub 2/ Ý90-10¿, as well as the unprecedentedly high gain for a TPC (2*10/sup 40/), are direct consequences of the expected performance in the high- multiplicity environment of heavy-ion collisions at the LHC. The characteristics of this mixture are discussed and a viable way of improving the stability of detectors working under these conditions, namely the addition of nitrogen into the mixture, is presented. This results in a more effective Penning transfer of neon excited states onto ionisation of the quencher at no penalty for the charge transport and amplification properties
Taller gráfico plástico basado en el aprendizaje significativo utilizando materiales concretos para la mejora de la motricidad fina en los niños y niñas de 4 años de la institución educativa “Garabatos” Los Pinos, distrito Chimbote en el año 2021
No full textEl presente trabajo de investigación se realizó ante los problemas detectados en el desarrollo de la motricidad fina, en la cual los niños tenían dificultad al realizar diversos trazos, por lo cual se determinó como objetivo determinar si el taller gráfico plástico basado en el aprendizaje significativo utilizando materiales concretos mejora la motricidad fina en los estudiantes de 4 años de la I.E.P Garabatos los Pinos de la ciudad de Chimbote-2021. La metodología que se utilizó en esta investigación es nivel explicativo, con un diseño experimental. La muestra estuvo conformada por 14 estudiantes de 4 años de edad, se trabajó con la prueba de Wilcoxon para comprobar la hipótesis de investigación. Los resultados del Taller Gráfico Plástico Pre-Tes se visualiza que 86% de los niños se encuentra en el nivel inicio C en desarrollar sus actividades motrices. Así mismo se realizó la aplicación de las técnicas grafo plásticas, en 11 sesiones, se aplicó una post evaluación, cuyos resultados se, identificando que 71% de los niños se encuentras en el nivel de logro destacado AD, demostraron diferencias significativas en el logro del desarrollo de la psicomotricidad fina, sin embargo, fueron mejorando elocuentemente en el desarrollo. Por lo tanto, al contrastar la prueba de hipótesis se obtuvo un valor de p=0.001 y como p <0.05 , entonces aceptamos la hipótesis alterna concluyendo que los talleres de grafico plástico influyen significativamente en el desarrollo de la motricidad fina en niños de 4 años
Procedure to insert and remove two alpha sources (RP4183 / RP4184) into the ALICE TPC gas quality monitor
No full textA radial TPC for heavy ions
No full textThe CERES experiment at the CERN SPS has been recently upgraded with a TPC with radial drift field, the first one of its sort. Constructed during 1998, it has been successfully operated in commissioning and physics runs, with muon, proton, and heavy-ion beams. A high voltage electrode of about 0.5 m radius is surrounded by sixteen 2 m long readout chambers, placed at a radius of 1.3 m, with chevron-shaped readout pads. The field cage is enclosed by two low-mass voltage degraders at each end of the cylindrical structure. A Ne-CO [80-20] gas mixture allows for a safe operation and good transport properties under drift fields ranging from 200 to 600 V/cm. A spatial resolution better than 700 microns and 350 microns in r and rdelta (phi), respectively, has been achieved in a highly inhomogeneous magnetic field. Details of its construction as well as results of the operation and performance in a high multiplicity environment are presented
La escritura: ¿espacio liso o estriado?
No full textA partir de los conceptos deleuzianos de espacio liso y estriado, la autora se propone explorar uno de los orígenes de la escritura: los garabatos infantiles. Gestos sin forma ni significado que afirman el ser y hacen cuerpo con el mundo, los garabatos apelan a la unidad de los sentidos en un sentir-actuar relacional, previo a cualquier esfuerzo comunicativo. Situados en una zona de indeterminación entre gesto y huella o trazo, acción y representación, figuración y abstracción, expresión y comunicación, dibujo y escritura, plantean algunas cuestiones fundamentales sobre la naturaleza de la sensibilidad y los procesos de simbolización.From the deleuzian concepts of smooth and fluted space, the author proposes to explore one of the writing origines: the children¿s hooks. Gestures without shape or meaning, that affirm the being and make a body with the world, children¿s hooks call all senses together in a relational feel and act, previous to any effort of communication. Placed in a zone of indetermination between gesture and pattern or mark, action and representation, figurative art and abstraction, expression and communication, drawing and writing, they ask essential questions about the nature of sensibility and the symbolizing process
Vestido y mujeres emancipadas en la narrativa de Emilia Pardo Bazán
No full textThe theme of Fashion and costumes is for Emilia Pardo Bazán inexhaustible whether from a hygienic, moral, economic, social or purely practical point of view. The Galician author lives intensely fashion and her trips abroad keep her in constant contact with the capital of the fashion world and her creations. That is why his novels and stories are full of characters built through fashion. The independent women who populate their stories and novels defy the codes of conduct of the time by dressing in a comfortable and practical way. The author elaborates the psychology of new and modern female literary archetypes such as Fé Neira, Miss Annie and Espina Porcel from clothing, makeup and accessories.El tema de la Moda y el vestuario es para Emilia Pardo Bazán inagotable ya sea desde un punto de vista higiénico, moral, económico, social o puramente práctico. La autora gallega vive intensamente la moda y sus viajes al extranjero la mantienen en permanente contacto con la capital del mundo fashion y sus creaciones. Es por ello que sus novelas y cuentos están repletas de personajes construídos a través de la moda. Las mujeres independientes que pueblan sus cuentos y novelas desafían los códigos de conducta de la época vistiéndose de manera cómoda y práctica. La autora elabora la psicología de nuevos y modernos arquetipos literarios femeninos como Fé Neira, Miss Annie y Espina Porcel a partir de la vestimenta, el maquillaje y los complementos
Squiggling to be: from yourself to the paper
No full textO objetivo deste artigo é refletir sobre o Jogo do Rabisco, uma situação criada por Winnicott para compreender a comunicação de seus pacientes. O jogo é descrito tal como proposto por Winnicott (1968, 1984) em seus textos O Jogo do Rabisco e Consultas terapêuticas em Psiquiatria infantil, respectivamente. Para o autor, os desenhos revelam, no espaço terapêutico, alguns aspectos da personalidade e habilidades perceptivas do indivíduo, que, muitas vezes, não se evidenciaram no ambiente familiar. O estudo de Safra a respeito desse tema enriquece o artigo. A experiência vivida por Karin, uma adolescente de 12 anos, apática para os estudos e para a vida, é apresentada como ilustração do modo como o Jogo do Rabisco pode acontecer no cotidiano clínico. O artigo pretende, também, fomentar a pesquisa com esse tipo de recurso, que parece simples, mas que é altamente complexo e de grande profundidade psíquica.El objetivo de este artículo es reflexionar sobre el Juego de Garabatos, una situación creada por Winnicott para comprender la comunicación de sus pacientes. El juego es descrito tal como propuesto por Winnicott (1968, 1984) en sus textos El Juego de Garabatos y Consultas terapéuticas en Psiquiatría infantil, respectivamente. Para el autor, los dibujos revelan, en el espacio terapéutico, algunos aspectos de la personalidad y habilidades perceptivas del individuo, que, muchas veces, no se evidencian en el ambiente familiar. El estudio de Safra al respecto enriquece el artículo. La experiencia vivida por Karin, una adolescente de 12 anos, apática para los estudios y para la vida, es presentada como ilustración del modo como el Juego de Garabatos puede suceder en el cotidiano clínico. El artículo pretende, también, fomentar la pesquisa con ese tipo de recurso que, a pesar de parecer simple, es altamente complexo y de gran profundidad psíquica.The purpose of this article is to reflect on the Squiggle Game, a situation created by Winnicott to comprehend the communication of his patients. The game is described as proposed by Winnicott (1968, 1984) in his texts The Squiggle game and Therapeutic Consultations in Child Psychiatry, respectively. To the author, the drawings reveal, in the therapeutic area, some aspects of the individual’s personality and perceptive abilities, which many times, couldn’t be evidenced in the familiar environment. Safra’s study regarding this theme enriches the article. The experience lived by Karin, a 12-year-old teenager, apathetic to the studies and to her life, is presented as an illustration of how the Squiggle Game may happen in the clinical routine. The article also intends to foster the research with this kind of resource, which seems to be simple, but is highly complex and of great psychic significance
Discharge and stability studies for the new readout chambers of the upgraded ALICE TPC
No full textThe ALICE (A Large Ion Collider Experiment) Time Projection Chamber (TPC) at CERN LHC is presently equipped with Multi Wire Proportional Chambers (MWPCs). A gating grid prevents ions produced during the gas amplification from moving into the drift volume. The maximum drift time of the electrons together with the closure time of the gating grid allows a maximum readout rate of about 3 kHz. After the Long Shutdown 2 (from 2021 onwards), the LHC will provide lead-lead collisions at an expected interaction rate of 50 kHz. To take data at this rate the TPC will be upgraded with new readout chambers, allowing for continuous read-out and preserving the energy and momentum resolution of the current MWPCs. Chambers with a stack of four Gas Electron Multipliers (GEMs) fulfil all the performance requirements, if the voltages applied to the GEMs are tuned properly. In order to ensure that these chambers are stable while being operated at the LHC, studies of the discharge behaviour were performed. We report on studies done with small prototypes equipped with one or two GEMs. Discharges were voluntarily induced by a combination of high-voltages across the GEM(s) and highly ionising particles. During these studies, the phenomenon of ``secondary discharges'' has been observed. These occur only after an initial discharge when the electric field above or below the GEM is high enough. The time between the initial and the secondary discharge ranges from several 10 μs to less than 1 μs, decreasing with increasing field. Using decoupling resistors in the high-voltage supply path of the bottom side of the GEM shifts the occurrence of these discharges to higher electric fields.The ALICE (A Large Ion Collider Experiment) Time Projection Chamber (TPC) at CERN LHC is presently equipped with Multi Wire Proportional Chambers (MWPCs). A gating grid prevents ions produced during the gas amplification from moving into the drift volume. The maximum drift time of the electrons together with the closure time of the gating grid allows a maximum readout rate of about 3 kHz. After the Long Shutdown 2 (from 2021 onwards), the LHC will provide lead-lead collisions at an expected interaction rate of 50 kHz. To take data at this rate the TPC will be upgraded with new readout chambers, allowing for continuous read-out and preserving the energy and momentum resolution of the current MWPCs. Chambers with a stack of four Gas Electron Multipliers (GEMs) fulfil all the performance requirements, if the voltages applied to the GEMs are tuned properly. In order to ensure that these chambers are stable while being operated at the LHC, studies of the discharge behaviour were performed. We report on studies done with small prototypes equipped with one or two GEMs. Discharges were voluntarily induced by a combination of high-voltages across the GEM(s) and highly ionising particles. During these studies, the phenomenon of "secondary discharges" has been observed. These occur only after an initial discharge when the electric field above or below the GEM is high enough. The time between the initial and the secondary discharge ranges from several 10 μs to less than 1 μs, decreasing with increasing field. Using decoupling resistors in the high-voltage supply path of the bottom side of the GEM shifts the occurrence of these discharges to higher electric fields
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