Synthesis of Pt/Carbon Xerogel Electrocatalysts for Proton Exchange Membrane Fuel Cells (PEMFC): Effect of the Reduction Procedure
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Materials Literature
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Theoretical study of solvent effect on NMR shielding for Pyrazole and Pyrazoline
The physical and chemical properties of Pyrazole and Pyrazoline molecules were theoretically studied by Gaussian 03, software with NMR and Molecular orbital calculations at B3LYP/6-31G and B3LYP/6-31+G(d) levels, in gas phase and solution. In this study a comparison effect of three solvents with different dielectric c…
Preparation and properties of reduced graphene oxide for direct methanol fuel cell application
Reduced graphene oxide has recently attracted great attention due to itsunique chemical and physical properties. In this study, reduced graphene oxide isintroduced in direct methanol fuel cell application as this system had been delayed byseveral reasons which are related to the lack of materials with good methanolper…
Effects of Oxygen Doping on the Transport Properties of Hg0.82Re0.18Ba2Ca2Cu3O8+d Superconducting Polycrystals
Hg0.82Re0.18Ba2Ca2Cu3O8+dpolycrystalline ceramic samples were prepared using a solid-vapour reaction technique. First, the ceramic precursor was prepared from a mixture of Ba2Ca2Cu3Oxand ReO2powders in a molar ratio of 1:0.18. The precursor material was annealed under three different partial pressures of oxygen that c…
Magnetocrystalline Properties of Sr1.4Ba1.6Co2Fe24O41
Multiferroic Ba1.6Sr1.4Co2Fe24O41 with a Z-type hexagonal structure was obtained through the proteic sol-gel process with a single-phase, combined with thermal treatment at 1200 °C for 2 h. XRD analysis revealed the formation of a single phase, with preferential orientation in the case of a sample in pellet form. Magn…
Justification for Determination of the Depth of an Active Zone Based on the II Group of Limiting States
The problems of the amendments in the updated edition of SNIP 2.02.01-83 * “Foundations of buildings and structures" SP 22.13330.2011 “Foundations of buildings and structures” are discussed in the article". Theoretically, the depth of the core is not justified anywhere and the restrictions are made only on the basis o…
Elastic and Thermal Properties of SrCo1-xScxO3-δ
We have investigated the elastic and thermal properties for perovskite SrCo1-xScxO3-d, by means of Modified Rigid Ion Model (MRIM). We have also computed the second order Elastic constants (SOECs) and their combinations. Besides we have reported the cohesive energy (f), Debye temperature (θD) and Gruneisen parameter (…
무색 투명 폴리이미드 박막의 잔류응력 거동 및 특성분석
이무수물인 4.4`-(hexafluoroisopropylidene)-diphthalic anhydride(6FDA)에 bis(3-aminophenyl) sulfone(APS), bis[4(3-aminophenoxy)-pheny1] sulfone (BAPS), 2,2-bis(4-aminophenyl)-hexafluoropropane(6FPD), 2,2-bis[4-(4-aminophenoxy)-phenyl]hexafluoropropane(6FBAPP). 2,2`-bis(trifluoromethyl)benzidine(TFDB) 및 1.4-phenylene-diamine(…
Solid phase transformation of carbamazepine-succinic co-crystal
This paper presents the solid phase transformation of carbamazepine-succinic co-crystal. Solvent evaporation, slurry crystallization and cooling crystallization are the three techniques which represent the solution based method were used. In this study ethanol was used as solvent. CBZ-SUC co-crystals formations are st…
Formation of Zinc Oxide Nanostructures and Their Photo-Electrochemical Application
Nowadays, low-temperature and environmentally conservative methods of functional oxides formation have been the main motivation for many researchers.By using low temperature synthesis techniques, flexible device fabrication utilizing substrates with low thermal stability such as organic polymer substrates are envisage…
Shape morphing in fibre reinforced composite beams containing NiTi
\n\t\t\t\t\tThe present research investigates the design, activation and modelling of a new generation of hybrid materials; called shape memory alloy-composites. These hybrid materials exhibit reversible bending motion with a temperature change and have the potential to be employed in aerospace, automotive and robotic…
Modelação numérica de corpos flutuantes – extratores pontuais
Os conversores pontuais de energia das ondas baseiam-se no movimento de um flutuador. Neste trabalho modela-se a resposta de um corpo flutuante quando excitado por ondas regulares e irregulares. Ao contrário da engenharia naval, onde se pretende minimizar os movimentos de um navio face à agitação, na conversão da ener…
ANALISIS DISTRIBUSI KETEBALAN DAN KEKERASAN HASIL CORAN SENTRIFUGAL ALUMINIUM PADUAN (Al-Mg-Si) AKIBAT PERUBAHAN LAJU PUTARAN DAN KEMIRINGAN SUMBU CETAKAN
Pengaruh gaya sentrifugal pada pengecoran sentrifugal adalah mampu menghasilkan coran yang lebih padat dan beberapa sifat yang unggul lainnya dibanding pengecoran konvensional. Tetapi kelemahannya adalah distribusi ketebalan dan kepadatan coran cenderung tidak merata, segregasi dan struktur yang tidak homogen akibat l…
Biopolimerek az orvostudományban – Lebontható vázanyagok
A biokompatibilis, illetve lebontható műanyagok megjelenése és elterjedése rendkívüli hatást gyakorolt a modern orvostudományra. Ezen belül is külön figyelmet érdemelnek az emberi szövetek regenerálódását, illetve mesterséges úton történő tenyésztését elősegítő polimer vázanyagok. Cikkünkben e pórusos szerkezetek tula…
Production & characterization of multi-walled carbon nanotube (carboxyl -functionalized) reinforced polyesters
This paper presents the study on the production and characterization of Carbooxyl functionalized Multi-Walled Carbon Nanotube (MWCNT) reinforced Polyester composite. The main objective of this study is to optimize the weight percentage of MWCNT in the composite and to optimize the sonication time of the composite. To…
ESTUDO DA DEGRADAÇÃO CAUSADA PELA RADIAÇÃO GAMA EM POLÍMEROS UTILIZADOS EM SERVIÇOS DE RADIOTERAPIA
Em servios de radioterapia so utilizados acessrios confeccionados com diversos tipos de polmeros para auxiliar no posicionamento dos pacientes durante o tratamento e na execuo das rotinas de trabalho. A radiao gama pode causar nos polmeros degradao de sua estrutura molecular, dificultar a sua na assepsia e seu reduzir…
Selective Catalytic Nitration of Phenol to o-Nitrophenol by Silica Supported Cesium Salts of Molybdovanadophosphoric Acid
A series of silica supported cesium salts of molybdovanadophosphoric acid catalysts with different loadings was prepared by sol-gel technology. Their properties were verified by XRD, IR spectra, SEM and physical adsorption technology. The catalytic activity of these catalysts was evaluated for the liquid phase nitrati…
Nanostructured TiO2-Based Composites for Light Absorption
Metal oxide nanocomposites were prepared by two different routes: polyol and sol-gel. Characterization by X ray diffraction showed that the first process produces directly a two-phase material, while the sol-gel powder never showed second phase below 600°C. Light spectroscopy of the treated powders indicated similarit…
Study on the effect of cellulose loading and ph on water absorbency of superabsorbent polymer composite
Cellulose is natural polymer that can be found abundantly in the earth which has biorenewable and biodegrable abilities. Over the last several decades, the uses of synthetic polymers in all kind of applications and fields make the earth in the state of danger. As known, polymers material is difficult to dispose and ca…
Investigation of Photoinduced Electrical Properties in the Heterojunction TiO2/SnO2
TiO2/SnO2 thin films heterostructures are grown by the sol-gel-dip-coating technique. It was found that the crystalline structure of TiO2 depends on the annealing temperature and the substrate type. TiO2 films deposited on glass substrate, submitted to thermal annealing until 550°C, present anatase structure, whereas…