Materials Literature
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Surfaces of optical parts are required to be smooth. Therefore, polishing is carried out. The period of polishing process depends on the roughness of ground surface. To shorten the period of polishing process, the roughness of ground surface must be smooth. In this paper, to clarify the optimum grinding condition, max…
The Effects of operating parameters such as initial pH, gaseous ozone concentration, supplied gas flow rate on dissolved ozone concentration and phenol degradation in ozone contact reactor were investigated. Dissolved ozone concentrations were saturated to constant values after a certain ozone contact time. The satura…
The ferritic-martensitic steel EUROFER is intended for use as a structural material for blanket components of future fusion reactors. A blanket module consists of a multiplicity of diffusion-welded cooling plates, which are connected by TIG, EB or laser welding seams. For the quality assurance of these welding seams t…
In many 13 kA splices in the machine there is a lack of bonding between the superconducting cable and the stabilising copper along with a bad contact between the bus stabiliser and the splice stabiliser. In case of a quench of such a defective splice, the current cannot bypass the cable through the copper, hence leadi…
International audience
Deep levels in AlGaN/GaN high electron mobility transistors (HEMTs) grown by molecular beam epitaxy on silicon (Si) substrates were characterized by the means Capacitance-Voltage and Deep Level Transient Spectroscopy. DLTS Measurements have revealed four electron traps with the binding energies of 0.08, 0.25, 0.47 and…
Polyurethanes (PUR) containing 37% of soft segments, obtained by prepolymer chain extension in the reaction of diphenylmethane 4,4'-diisocyanate (MDI) with 1,4-butanediol (1,4-BD) were synthesized. Soft segments of PUR were built either of poly([R,S]-3-hydroxybutyrate) (a-PHB) and polycaprolactonediol (PCL) or a-PHB a…
La reaction d'oxydation menagee du methanol sur catalyseurs purement redox conduit principalement a la formation de formaldehyde. Sur des catalyseurs FeMo optimises, des sous-produits tres minoritaires tels que l'acide formique et les oxydes de carbone (CO x ) sont egalement detectes. Dans le cas de catalyseurs possed…
International audience
It is well known that the properties of a metamaterial are usually determined from the geometrical structure and material parameters rather than composition. One of the problems of resonant types of metamaterials is that they usually have narrow operating bandwidth. In this paper, a novel metamaterial resonator with d…
Carbon nanotubes (CNTs) have a great potential for applications in medicine. However, their biocompatibility and toxicity cause a great concern. Due to the large surface area of CNTs, chemical modification can dramatically alter their physiochemical properties and hence biological activity. Using a combinatorial chemi…
Abstract: Combustion data of ammonium chlorate and nitrite have been analyzed. The leading reactions of combustion of both NH4ClO3 and NH4NO2 at low pressures have been shown to proceed in the condensed phase, with the burning rate defined by the decomposition kinetics at the surface temperature. The kinetics of NH4Cl…
Proton conduction is reported in partially proton-exchanged at intermediate temperatures. Electrochemical measurements demonstrated that proton conduction occurs in this material. Proton magic angle spinning nuclear magnetic resonance and Fourier transform IR analyses revealed that the ion-exchanged protons interact w…
The paper deals with the application of ionic liquids (ILs) as solvents and as reaction media. Ils, namely 1-butyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium chloride, 1-ethyl-3-methylimidazolium acetate, 1-butyl-2,3-methylimidazolium chloride and 1-allyl-2,3-dimethyl-imidazoliumbromide, dissolve cellul…
A new code MCORGS which links MCNP and ORIGENS is developed to do the transport-burnup calculation.MCORGS can be used to compute both criticality problem and subcriticality problem with an external neutron source.It has no limitation on neutron spectrum or geometry shape.MCORGS is more versatile than MCCOOR which is d…
Experimental study on thermal decomposition characteristics of urea solution under high temperature and influences of Na2CO3 on related factors was carried out in a quartz tube reactor.The experimental results show:The hydrolysis efficiency of HNCO is very low when keeping high effective-decomposition rate of urea.Ure…
The life cycle assessment method was used to analysis of two copper metallurgical processes: bio-heap leach and traditional flotation-flash smelting.Environmental load datum in each stage of the copper production were obtained.The results indicated that environmental impacts of copper production with bio-heapleach is…
In this research, cerium oxide (CeO2) nanoparticles were synthesized by the homogeneous precipitation. Cerium nitrate hexahydrate and ammonia solution were used as precursors. A mixture of water and ethylene glycol was used as solvent. The ratio of ethylene glycol /water mixed solvent was 80% by volume of ethylene gly…
Depending on previous experimental data,the thermo-physical properties of a bearing steel were studied by using certain mathematical methods.The results showed that the liquidus temperature of GCr15 is 1 465.7 ℃,solidus temperature is 1 328.4 ℃,zero strength temperature is around 1 380 ℃,and zero ductility temperature…
A fluid model of negative DC streamer discharge was set up to obtain the characteristics of negative DC corona streamer pulse under various pressure and humidity, and the flux-corrected transport algorithm and method of disks were applied to solve the one-dimension continuity equations and two-dimension Poisson’s equa…