Materials Literature
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Beyond a given threshold, an upward fluid flow at constant flow rate, injected through a small size section, is able to generate a fluidization along a vertical chimney over the entire height of a granular assembly. Fluidization is first initiated in the immediate vicinity of the injection hole and then the fluidized…
Dispositivos foto e eletroluminescentes com filmes finos de nitreto de silício não estequiométrico (SiNx) depositados por sputtering reativo sobre substrato de Si foram fabricados e caracterizados. A arquitetura dos dispositivos é composta por um substrato de Si coberto pelo filme de SiNx e os contatos são de óxido de…
Os acidentes por radiacao vem causando grandes danos a sociedade e meio ambiente, levando em consideracao que os maleficios sao a curto e longo prazo. Em todos os relatos de acidentes a falta de informacoes precisas e de conhecimento das empresas, governo e sociedade agravaram a situacao, causando graves consequencias…
We present a model explaining relaxation time of PPG(Polypropylene glycol) and PPGM (Polypropylene glycol dimethylether) with different molecular weights, PPG2 (Mw = 2 kg mol-1), PPG3 (Mw=3 kg mol-1), PPGM1 (Mw=1 kg mol-1), and PPGM2 (Mw=2 kgmol-1), as a function of hole fraction at various fluid phase temperatures an…
The arthor describes the main results of developing calculation-experimental method of estimating the efficiency of automotive engine’s preheat, allowing to set the areas of primary temperatures of an engine, in which for single launching, economic effect from decreasing launching wear exceeds the operational costs, c…
Tato prace se zabýva syntezou a charakterizaci homogennich a poreznich silikofosfatových materialů, jejichž kostru tvoři skupiny Si−O−P. Nejdřive jsme se věnovali nalezeni vhodneho syntetickeho postupu pro připravu silikofosfatových materialů. Jako vhodný postup jsme identifikovali nehydrolytickou sol-gelovou kondenza…
Polylactide (PLA) which is already available in large commercial quantities shows a good potential asbiobased and biodegradable polymer in several sectors. Nevertheless its low ductility narrows its usagepotential needed to manufacture efficient thermoplastic films for food packaging. External plasticizationis the mai…
Programa de doctorado: Gestion de recursos vivos marinos y medioambiente (bienio 2001-2003)
In this paper we analyze the suitability and feasibility of the method proposed by Prakash for the determination of the dielectric relaxation parameters, namely activation energy and fundamental relaxation time, and order of kinetics, of a thermally stimulated depolarization (TSD) spectrum, also known as ionicthermocu…
The electronic transport properties of graphene on hexagonal boron nitride (hBN) have been studied intensively in the past few years, and rich phenomena such as the fractal Hofstadter's butterfly energy spectrum and Landau level crossing have been observed. This thesis reports our transport measurements on few-layer g…
Chemical modification of naturally occurring polysaccharide, guaran has been made by incorporating 5- aminosalicylic hydroxamate moiety to improve its selectivity and capacity for heavy metal ions. 5- Amino salicylic acid hydroxamate derivative of guaran (ASAH-G) was synthesized, characterized and its adsorption behav…
شيماء عبدالدائم علي عبدالدائم. Quantum Dot as Absorbing Solar Cell Material شيماء عبدالدائم علي عبدالدائم :جام اشرافمحمد يس مصطفي.-شندي:جامعة شندي
In many situations of geological and environmental relevance one deals with capillary systems, composed of charged solids in contact with aqueous solutions of varying pH, ionic strength, temperature and pressure. Such capillary systems share the presence of electric double layers, which manifest themselves in the spat…
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Setiap peralatan elektronik mempunyai batasan umur tertentu, tak terkecuali transformator. Apabila transformator ini mengalami kegagalan maka akan mengganggu kelangsungan sistem tenaga listrik. Untuk mencegah hal ini perlu dilakukan pengawasan terhadap kondisi trafo dengan cara melakukan pemeliharaan secara teratur. U…
Изучен биосинтез изолимонной кислоты из рапсового масла дрожжами Yarrowia lipolytica и его регуляция. Установлена принципиальная возможность направленного биосинтеза дрожжами Y. lipolytica изолимонной кислоты с минимальным содержанием побочного продукта лимонной кислоты на среде, содержащей рапсовое масло. В результ…
High efficiency Cu(In,Ga)Se2 solar cells are generally prepared above 500°C. Lowering the process temperature can allow wider selection of substrate material and process window. In this paper, the three-stage co-evaporation process widely used to grow CIGS thin film at high temperature was modified to reduce the maxim…
Our results demonstrate that immobilizing stabilizing molecules on nanoparticles, and using the latter as multifunctional filler for nanocomposites, is a viable route towards to produce high-performance polymeric materials
The chapter describes the role of multiscale molecular simulation to the design and development of nanovectors for gene therpy and drugs for targeted therapy.
Threat of terrorist attack is today’s reality and the most vulnerable structures are public transportation facilities which are, by the definition, designed to be accessible. Motivation for this research is following scenario: malicious person drives a car or a small truck under the overpass bridge, leaves it and deto…