130,756 research outputs found
A generalised program for fuel cell systems simulation
No full textA computer program simulating the performance of a fuel cell system has been developed for the analysis of small-scale power plants and uotomotive technologies. FC2000 (Fuel Cells 2000) is based on a Sequential Modular Approach, is coded in Fortran and is user-interfaced by a preprocessor written in Visual Basic. All the system is compatible with a Window environment. Models describing fuel cell equipments were either home developed or acquired from already existing codes desdcribed in literature (Pierucci et alt., 1985), while the preprocessor was specifically created for this application. FC2000 has been succesfully applied to the study and design of transportation technologies and power-plant stationary systems. The paper will describe FC2000 structure, will provide the content of specific fuel cell models and finally will discuss the results of a typical design where an innovative solution is proposed to increase process efficiencies. © 2002 Elsevier B.V. All rights reserved
Occurrence and removal of heavy metals from industrial and municipal wastewater: a comparison between MBR and conventional activated sludge processes (CAS)
No full textHeat and mass transfer in roast beef cooking. Temperature and weight loss prediction
No full textThe development of food processes, ingredients and formulations is a daily topic for the food industries. Model-based product, process and equipment design are getting increasing industrial attention, due to the high potential in matter of time and money saving. Bringing these advantages to the consumers’ table by the application of this approach is one of the ultimate challenges of food and bioprocess engineering. This work aims to consider roast beef cooking as a practical, widespread, case study. A computational model, which correlates temperature, time and weight loss for a standard piece of meat cooked in oven, is developed and validated with experiments. The thermal properties are derived with a general approach, applicable to other food. The heat and mass transport equations are based both on conservation laws and on the cooking conditions
Production of soluble organic compounds by anaerobic fermentation of organic solid waste
No full text
Dizionario di lessico metalinguistico on line fra era gutenberghiana e rivoluzione digitale
No full textVitamin D and Sphingolipids: Role in Bone and Neural System
No full text1-Alpha,25-dihydroxyvitamin D3 (1,25(OH)2D3) is known to play an important physiological
role on growth and differentiation in a variety of nonmalignant and malignant cell
types through classical actions, mediated by its specific receptor (VDR), and nongenomic
actions resulting in the activation of specific signalling pathways. Due to the broad distribution
of Vitamin D Receptor (VDR) in many tissues and the ability of 1,25(OH)2D3 to
regulate fundamental processes, such as cell proliferation and differentiation, this steroid
hormone has been suggested in the treatment of different diseases, from cancer to neurodegenerative
diseases. In fact, structural 1,25(OH)2D3 analogues, with weaker collateral
effects, have recently entered in clinical trials. Other interesting molecules due to their
pleiotropic actions are the bioactive sphingolipids (SLs), in particular ceramide (Cer) and
sphingosine 1-phosphate (S1P). Cells maintain a dynamic balance of these metabolites
since Cer and sphingoid bases mediate cell death, while S1P exerts mitogenic effects and
promotes differentiation of several cell types including osteogenic and neural cells. The
biological actions of 1,25(OH)2D3 and SLs, in particular S1P, share many common effectors,
including calcium regulation, growth factor expression, inflammatory cytokines,
etc., but whether they could act synergistically is still unknown and deserves further
investigation
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