963 resultados para Six sigma (Quality control standard)


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Debido a la coyuntura actual y a la liberalización del comercio de alimentos, es necesariogarantizar la seguridad e inocuidad de los alimentos, las cuales se conseguirán aplicando lasprácticas y las normas apropiadas en materia de seguridad alimentaria. Los reglamentoscomunitarios en materia de seguridad alimentaria, y en particular el Reglamento (CE) nº852/2004 relativo a la higiene de los alimentos, obligan a las empresas alimentarias a aplicarun sistema de autocontrol basado en los principios del Análisis de Peligros y Puntos Críticosde Control (APPCC). En España, la legislación nacional ya contemplaba este requisito. En elámbito de las comidas preparadas, esta exigencia se recogía expresamente en el Real Decreto3484/200, de 29 de diciembre, por el que se establecen las normas de higiene para laelaboración, distribución y comercio de comidas preparadas.En el presente Proyecto/Trabajo Final de Carrera (PTFC), se ha elaborado un manual, queconsta de ocho capítulos, unos anexos y una memoria descriptiva, que servirá de guía para eldiseño de un sistema de APPCC, siguiendo los procedimientos definidos en el CodexAlimentarius, que permita su aplicación a las industrias elaboradoras de creps y a la vezproporcione las pautas necesarias para su implantación. Debido a la imposibilidad de aplicarel sistema de APPCC desarrollado a una industria concreta, se ha elaborado un manualgenérico que cada industria deberá adaptar a sus sistema productivo

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Because of technical principles, samples to be observed with electron microscopy need to be fixed in a chemical process and exposed to vacuum conditions that can produce some changes in the morphology of the specimen. The aim of this work was to obtain high-resolution images of the fresh articular cartilage surface with an environmental scanning electron microscope (ESEM), which is an instrument that permits examination of biological specimens without fixation methods in a 10 Torr chamber pressure, thus minimizing the risk of creating artifacts in the structure. Samples from weight-bearing areas of femoral condyles of New Zealand white rabbits were collected and photographed using an ESEM. Images were analyzed using a categorization based in the Jurvelin classification system modified by Hong and Henderson. Appearance of the observed elevations and depressions as described in the classification were observed, but no fractures or splits of cartilage surface, thought to be artifacts, were detected. The ESEM is a useful tool to obtain images of fresh articular cartilage surface appearance without either employing fixation methods or exposing the specimen to extreme vacuum conditions, reducing the risk of introducing artifacts within the specimen. For all these reasons it could become a useful tool for quality control of the preservation process of osteochondral allografting in a bank of musculoskeletal tissues.

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In the petroleum refining industry, the use of crude from several origins is frequent. This leads to a product of variable chemical composition during refining, hindering quality control. Therefore, it is important to develop classification models that help to better characterize those products. The objective of this study is to develop a SIMCA recognition pattern to classify kerosene using infrared spectroscopy data. The model permits to differentiate two kerosene groups with different chemical compositions, which was corroborated by mass spectrometry.