Search results for " Teoria del"
showing 10 items of 453 documents
Membrane distillation heat transfer enhancement by CFD analysis of internal module geometry
2011
Module geometry optimisation can be a crucial matter in all separation processes using selective or hydrophobic membranes, e.g. reverse osmosis (RO) and membrane distillation (MD). In fact the choice of suitable channel shape and size can dramatically affect the performance of the process. With reference to the membrane distillation process, temperature polarization phenomena and pres¬sure drops along the channels largely affect the process efficiency (i.e. the efficient use of temperature driving force for the passage of vapour through the membrane) as well as pressure distribution, module mechanical resistance and pumping costs. Several works have been presented so far in literature on th…
Electrodialysis for wastewater treatment—Part I: Fundamentals and municipal effluents
2020
Abstract Selectivity, high recovery, and chemical-free operation are strengths of electrodialysis. Different configurations have been proposed for several applications. Effluents from municipal wastewater treatment plants (including sludge and supernatants), desalination plants, and animal farms can be treated for recovering water, nutrients, salts, and acids/bases. Although many applications are technoeconomically feasible and competitive with other zero liquid discharge systems, only a few real plants have been installed. However, the research is currently very active, thus paving the way for a widespread use at large scale in the next future.
Electrodialysis for wastewater treatment-part II: Industrial effluents
2020
Abstract Electrodialysis and related processes have huge potential in the treatment of effluents from a variety of industrial processes. They can recover water and other valuable products, including heavy metal ions, acids and bases, nutrients, and organics. In recent years, novel and improved systems have been continuously developed as a result of research in the field, showing that the (near) zero liquid discharge approach can be affordable in several industrial applications. A larger market share is expected in the near future.
Infància i memòria en Walter Benjamin
2016
El tema de la memòria apareix de manera recurrent en l'obra de Walter Benjamin sota punts de vista ben diversos. Unes vegades contempla la memòria des de la perspectiva estètica de la connexió entre record i imatge; altres vegades és considerada més aviat com a matèria de recreació existencial que com a objecte d'indagació i anàlisi. Aquesta perspectiva és precisament la que predomina en els escrits més personals de Benjamin. El meu propòsit és sondejar el fons d'experiència moral i històrica que subjau a l'exercici de rememoració que constitueix el seu llibre Infància a Berlín cap al 1900, on l'autor aconsegueix una prodigiosa fusió de poesia i veritat.
Investigation of Multicomponent Sorption in Polymers from Fluid Mixtures at Supercritical Conditions: The Case of the Carbon Dioxide/Vinylidenefluor…
2008
The simultaneous sorption of carbon dioxide and vinylidene fluoride (VDF) in poly(vinylidenefluoride) from their supercritical (sc) mixtures was studied using an experimental method, already described in a previous publication, based on the gas-chromatographic determination of the equilibrium composition of the fluid phase in contact with the polymer. Argon was added to the system as a nonabsorbable molecular probe in the polymer to take into account the effect of the volume swelling on the measurement. Sorption behavior has been studied at 50 °C by changing the composition and the density of the supercritical phase. We have found that VDF dissolves in its polymer with concentrations much l…
No-Flow Temperature in Injection Molding Simulation
2010
Most injection molding simulation packages use the no-flow temperature (NFT) as a means of determining whether the polymer flows or is solid. The NFT is not well defined, and a standard method for measuring it does not exist. A sensitivity analysis of the filling stage has been carried out with two different packages [VISI Flow (Vero Software Limited, Gloucestershire, UK) and Moldflow (Autodesk, Inc., San Rafael, CA)] to estimate the influence of the NFT on the main processing parameters. The NFT has a large influence on the thickness of the frozen layer, but it does not appreciably affect the filling pressure. Because the NFT affects the frozen layer, an effect on the estimation of shrinka…
Belief, acceptance and knowledge
2009
According to Contextualism about knowledge, it is possible that a subject, with the same amount of evidence and the same degree of con-viction, knows that P in a context and not in another. In this paper, I favor the invarationist conception of knowledge by drawing a distinction between belief and acceptance."Know", I defend, does not change in meaning across contexts, althoughI acknowledge it is not correct to self ascribe knowledge when one does not accept that P. Según la posición contextualista puede ocurrir que con las mis-mas evidencias y el mismo grado de convicción, un sujeto sepa que P en un contexto y no en otro. Mediante la distinción entre aceptación y creencia, se combate tal p…
Brackish water off-grid desalination systems for developing countries
2017
The REvivED water project aims to contribute to overcoming the drinking water challenge through desalination technology. The goal is to produce safe and affordable drinking water with a significantly reduced energy consumption compared to the current state-of-the-art technology. The overall project comprises several systems and applications with twelve pilots in total, ranging from Electrodialysis (ED) small systems for brackish water desalination to larger scale hybrid (RED/ED-RO) systems for sea water desalination. Specific attention is devoted to develop energy efficient and robust brackish water desalination systems for application in developing countries. To reduce the energy consumpti…