Search results for "material"
showing 10 items of 32550 documents
Advances in Nanoliposomes Production for Ferrous Sulfate Delivery
2020
In this study, a continuous bench scale apparatus based on microfluidic fluid dynamic principles was used in the production of ferrous sulfate-nanoliposomes for pharmaceutical/nutraceutical applications, optimizing their formulation with respect to the products already present on the market. After an evaluation of its fluid dynamic nature, the simil-microfluidic (SMF) apparatus was first used to study the effects of the adopted process parameters on vesicles dimensional features by using ultrasonic energy to enhance liposomes homogenization. Subsequently, iron-nanoliposomes were produced at different weight ratios of ferrous sulfate to the total formulation components (0.06, 0.035, 0.02, an…
Use of peat-based sorbents for removal of arsenic compounds
2013
Abstract It is important to apply sorbent materials for purification of water from arsenic contamination due to serious arsenic pollution worldwide. We have developed new sorbents based on natural materials that provide a cheap and environmentally friendly alternative. For the first time, peat modified with iron compounds and iron humates were tested for sorption of arsenic compounds. The highest sorption capacity was found in peat modified with iron compounds. We have found that sorption of different arsenic speciation forms was strongly dependent on solution pH, reaction time and temperature. Calculations of the sorption process using thermodynamic parameters indicate the spontaneity of s…
“Det sitter i veggene”. Materialitet og mennesker i distriktspsykiatriske sentra
2009
This dissertation examines the impact that the materiality of institutions has on patients and staff. Fieldwork has been carried out at five district psychiatric centres (Distriktspsykiatriske sentra, DPS) that were originally built as tuberculosis institutions. The patients’ and employees’ experiences of being present in the physical and social space of these institutions has been examined, interpreted and reflected upon. The paper provides knowledge about the significance institutions’ materiality and inner life has on the informants, and how the informants influence the materiality. Background Mental health care has moved away from institutions and towards the local community. The treatm…
Il Bambù
2008
Il volume fa parte di una collana dal titolo Tecnologia dei Materiali per un'Architettura Sostenibile, che raccoglie i risultati di ricerche, sperimentazioni ed esperienze didattiche condotte dall'autrice negli ultimi anni, presso l'Università degli Studi di Palermo. Ogni volume della collana è dedicato allo studio di uno specifico materiale da costruzione e dei suoi derivati, delle loro peculiarità e possibili applicazioni nel costruito al fine di offrire agli studenti, ai professionisti e ai tecnici del settore, un quadro generale dello stato dell'arte ed un motivo in più per una scelta consapevole di materiali conformi alle esigenze di sostenibilità ambientale e tecnologica, oggi inderog…
La ricchezza che non si rifiuta
2009
Etude numérique et expérimentale de l'assemblage acier aluminium par soudo-brasage
2006
Dans cet article nous étudions le soudo-brasage de tôles d'acier et d'aluminium (par la technique CMT, assemblage à clin). Ces métaux ont des coefficients de dilatation thermique différents, ce qui provoque des déformations, d'où des contraintes mécaniques élevées. Des expériences sur des éprouvettes, une simulation numérique thermomécanique sont menées en parallèle afin de mieux comprendre ces aspects thermiques et mécaniques dans le but de minimiser la déformation de l'assemblage.
The Industrial Applicability of PEA Space Charge Measurements, for Performance Optimization of HVDC Power Cables
2019
Cable manufacturing industries are constantly trying to improve the electrical performance of power cables. During the years, it was found that one of the most relevant degradation factors influencing the cable lifetime is the presence of space charge in the insulation layer. To detect the accumulated charge, the pulsed electro-acoustic (PEA) method is the most used technique. Despite the wide use of the PEA cell, several issues are still present. In particular, the PEA output signal is strongly disturbed by the acoustic waves reflections within the PEA cell. This causes the distortion of the output signal and therefore the misinterpretation of the charge profiles. This, in turn, may result…
Modelling flow and heat transfer in spacer-filled membrane distillation channels using open source CFD code
2013
Abstract A good understanding of the details of hydrodynamic and heat transport conditions and their impact on temperature polarisation and pressure drops is essential for optimum design of membrane distillation (MD) modules. To this end, the present work reports on initial progress in the development of a tool for 3D simulation of spacer-filled MD channels based on the open source CFD code library OpenFOAM. The paper discusses a number of modelling and implementation aspects including model geometry and computational domain, choice of boundary conditions, and discretisation schemes. The results pertaining to the effect of three different spacer types on the fluid dynamics and heat transfer…
An updated dichotomous key to the snakes of Europe
2022
This work presents an updated dichotomous key to all snake species of Europe, based on morphological, morphometric and distributional characters. It gathers data from both the last dichotomous keys concerning European snake species and every following paper giving updates on taxonomic classification or the occurrence of new allochthonous species. The key includes 58 snake taxa, including 57species and one still unnamed taxon, distributed on the European territory, and photographic material for each species. The aim of this paper is to make the identification of all European snake species through a single manuscript more accessible, not only for researchers, but also for citizen science, thu…