Combined microwave–convective drying of saccharomyces cerevisiae based yeast

Attention is paid to drying as a downstream processing of foodstuff as it is used finally for human consumption. In some cases the conventional (convective, contact or infrared) drying processes can damage the quality of food due to crusting phenomena, overheating or protein denaturation. Better results can be obtained using combined microwave–convective dehydration.The paper mainly focuses on the investigation of drying Saccharomyces cerevisiaepulp using the method of dielectric dehydration. A dried product with a residual fermentative activity of over 80% was produced with the application of a microwave–convective drying system. As a result the moisture content was lower than 10% calculated on dry basis. We permanently regulated the incident microwave power manually in order to eliminate the mentioned disadvantageous effects. This type of regulation was applied when the surface temperature reached 45 °C

Requerimientos de usuarios de la edificación traducidos en una metodología de apoyo a la decisión

Different actors of building sector have developed various methods that assess the quality of its buildings in response to environmental issues. The methods developed in a specific context, have achieved a great popularity in recent years, but also an ambiguity in its measurement, a confusion in the objective pursued, forgetting the context in which they are intended. This paper develops a methodology of decision support, which evaluates the performance of existing buildings from the point of view of energy and user satisfaction, to decide between rehabilitation or demolition. The case of study is an university campus, which brings together different uses and users, and therefore different quality and comfort requirements. The indicators in the methodology consider this complexity, delivering its results in a single evaluation profile and allowing to be applied in different contexts.<br><br>Diferentes actores del sector de la edificación han desarrollado diversos métodos que evalúan la calidad de sus edificios en respuesta a problemáticas medioambientales. Métodos desarrollados en un contexto específico, en este último tiempo han alcanzado una gran popularidad, pero al mismo tiempo ambigüedad en su medición, confusión en el objetivo que persiguen, olvidando el contexto en los que han sido concebidos. En este trabajo se desarrolla una metodología de apoyo a la decisión que evalúa el comportamiento de edificios terciarios en fase de explotación desde el punto de vista energético-medioambiental y satisfacción de sus usuarios, con el fin de decidir entre una rehabilitación o la demolición. El caso de estudio es un campus universitario en Francia, el cual reúne distintos usos y usuarios, y por lo tanto distintos requerimientos de calidad y de confort. Los indicadores que conforman la metodología consideran esta complejidad entregando sus resultados en un único perfil de evaluación, permitiendo ser aplicados en distintos contextos

Principles of a Simulation Model for a Variable Speed Pitch Regulated Wind Turbine

International audienc

Multiphysics modeling of vacuum drying of wood

cited By 27International audienc

Colour alteration and chemistry changes in oak wood (Quercus pedunculata Ehrh) during plain vacuum drying

cited By 11International audienc

Study of color alterations in European oak wood during [Étude des altérations de la couleur du bois de Chêne lors du séchage sous vide discontinu]

International audienc

Thermal modelling of a carbon/carbon composite material fabrication process

The rapid densification process is a variant of Chemical Vapour Infiltration. It allows to fabricate composite materials starting from a fibrous preform lying in a boiling hydrocarbon precursor, the cracking of which results in a solid deposit constituting the matrix of the carbon/carbon composite. A phenomenological analysis emphasises the significant role played by temperature in the couplings between various physical and chemical phenomena. It is shown here that the control of the thermal couplings makes it possible to decrease the power consumed while guaranteeing the quality of the final material

Shrinkage and density evolution during drying of tropical fruits: Application to banana

cited By 70International audienc

Criterion for crack initiation during drying: Alumina porous ceramic strength improvement

cited By 23International audienceImprovement in the mechanical strength of the supports of porous catalysts is increasingly needed by the refining industry because of the high stresses induced by the exploitation of catalysts. Drying is known to be a critical process for mechanical strength during the preparation of supports, leading to micro-cracks in the case of hard drying conditions.In order to predict failure during drying, a crack initiation criterion, combined with a drying induced elastic stress simulation is proposed. Model parameters are the thermo–hydro–mechanical properties of the gel and the criterion is based on the tensile strength of an alumina gel at various moisture contents. The developed tool gives good results and can be easily adapted to several gel formulations as only effective properties of the gel are required

The Notion of densification front in CVI processing of CMCs

International audienc