58 research outputs found

    Evaluaci?n de las relaciones comerciales entre fabricantes y distribuidores del canal de distribuci?n de ladrillos cer?micos en Lima Metropolitana

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    Las relaciones comerciales en el canal de distribuci?n han evolucionado, por ello analizamos los factores que determinan las relaciones comerciales entre fabricantes y distribuidores. El objetivo principal se basa en el estudio de los principales factores que intervienen en las relaciones comerciales entre fabricante y distribuidor, para determinar si existe relaci?n entre ellas y su implicancia en el entorno empresarial. Esta es una tesis cuantitativa descriptiva y correlacional, nuestra poblaci?n de estudio fueron los fabricantes de ladrillos cer?micos en Lima Metropolitana y los due?os de dep?sitos que venden agregados de construcci?n. Los resultados confirman muchas de las hip?tesis del modelo, validando la relaci?n directa entre los factores: Inversiones en activos espec?ficos y la dependencia, la inversi?n en activos espec?ficos y el comportamiento oportunista, la dependencia y la percepci?n oportunista, la confianza y la satisfacci?n no econ?mica directa, el compromiso y la satisfacci?n no econ?mica y la satisfacci?n econ?mica con la no econ?mica. Adem?s de ello, valid? la relaci?n inversa entre la percepci?n oportunista y la confianza. Finalmente se realizar?n recomendaciones para el fabricante de ladrillos cer?micos, planteando la incursi?n en mercados no explorados, diversificar su producci?n y tomar otras medidas para combatir el incumplimiento de pago y la informalidad

    The XXIV European Muscle Conference

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    Formation of residual stresses during quenching of Ti17 and Ti 6Al 4V alloys Influence of phase transformations

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    The formation of internal stresses during quenching of titanium alloys from the amp; 946; phase field are investigated both experimentally and by simulation, in order to show the effects of phase transformations. Two titanium alloys are considered the amp; 946; metastable Ti17 alloy and the amp; 945; amp; 946; Ti 6Al 4V alloy. During the quench into water of laboratory scale samples 40 mm diameter cylinders , no phase transformations occurred in the Ti17 alloy because of its amp; 946; metastable character and the fast cooling. However, amp; 946; amp; 8594; amp; 945; amp; 946; and amp; 946; amp; 8594; amp; 945; amp; 8242; phase transformations occurred in the Ti 6Al 4V sample. Both alloys are compared in order to highlight the effects of the phase transformations. Residual stresses were determined by neutron diffraction, by the contour method and at the surface by the hole drilling method. A model for the coupled thermal, mechanical and metallurgical evolutions is established in order to simulate the quenching operations. The material model for the Ti17 alloy was established in a previous study. Regarding the Ti 6Al 4V alloy, modeling approaches and experimental data from literature are utilized to build the material model. From both experiment and simulation, it is found that the internal stress evolutions are governed by the thermal gradients. The phase transformations have a weak impact because of the small deformation strains induced by the phase change. Nevertheless, good prediction of the phase transformation kinetics is necessary for accurate simulations, because the amp; 945; and amp; 945; phases strengthen the alloy, thereby limiting the plastic straining at the origin of the residual stresses. As most plastic strains are cumulated at high temperature, the thermomechanical model should be established accurately over the temperature ranges in which there is a significant proportion of amp; 946; phas

    Animar Series of Photographic Lenses

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