Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
The crystal structures of two manganese hexacyanometallates(II), Mn 2 [Fe(CN) 6 ].8H 2 O and Mn 2 [Os(CN) 6 ].8H 2 O, were refined from X-ray powder diffraction data using the Rietveld method, with the reported structure for Mn 2 [Ru(CN) 6 ].8H 2 O used as a structural model. These compounds are isomorphous and crysta…
The study of heat exchanger fouling using supersaturated calcium sulphate solutions has been widely reported. In this study fouling was investigated in a larger-scale heat exchange apparatus using stainless-steel pipe, and data were obtained at different flow rates, concentrations and temperature differences. The depo…
Aiming to resolve some of the problems regarding monitoring of heavy metals in rivers using Cladophora glomerata and epilithic algal communities, a year’s survey of Co, Cd, Cu, Fe, Mn, Pb and Zn has been conducted on the river Vardar, FY Republic of Macedonia. Obtained results and statistical analysis clearly point ou…
The local environment of Nd‐O in a sodium tellurite glass was elucidated as a function of Nd 2 O 3 concentration, from 0.1 to 2.5 mol%, using optical spectroscopy. The Judd‐Ofelt (J‐O) theory was used to determine the oscillator strength parameters (J‐O parameters) of the glasses. According to the J‐O parameters, a si…
First-principles all-electron total-energy calculations of the structural and electronic properties for the group-IV zincblende-like compounds GeC, SnC using the full-potential linearized plane wave (FP-LAPW) approach within the density functional theory (DFT) in the local density approximation (LDA) and the generaliz…
A refratariedade e a resistência ao choque térmico dos materiais estão intrinsecamente ligadas às fases que os compõem, de modo que a identificação destas fases através da técnica de difração de raios X é atualmente imprescindível para a completa caracterização de matérias-primas de produtos cerâmicos. Em 1969, H. M.…
Nous avons affine la structure cristaline de l'ushkovite, triclinique, a 5.3468(4), b 10.592(1), c 7.2251(7) A, a 108.278(7), β 111.739(7), γ 71.626(7)°, V 351.55(6) A 3 , Z = 2, groupe spatial P1, jusqu'a un residu R de 2.3% en utilisant 1781 reflexions observees mesurees avec rayonnement MoKa. Le meme cristal a par…
The size reduction by dispersers in the liquid phase was investigated for different energetic materials such as hexogen (RDX), octogen (HMX), 3-nitro-1,2,4-triazole-5-one (NTO), hexanitrostilbene (HNS), ammonium nitrate (AN) and hexanitrohexaazaisowurtzitane (CL20). Two different dispersers, an ultrasonic device and a…
Abstract Lateritic weathering kaolinites have been characterized in situ and differentiated for the first time by means of infrared microspectroscopy (IRMS). Four classical OH-stretching bands have been observed in the Fourier transform infrared (FTIR) spectra, at 3695, 3668, 3650 and 3620 cm −1 , denoted ν 1 , ν 2 ,…
A novel experimental multiterminal silicon light emitting diode matrix is described, where both the emitted light intensity and the spatial light pattern of the device are controlled by insulated metal-oxide-semiconductor (MOS) gate voltages. It is found that the light intensity is a nonlinear quadratic function of th…
A comprehensive mathematical model is developed to quantify the effect of the oxygen concentration on the polymerization rate and particle size distribution in an unseeded vinyl chloride batch emulsion polymerization reactor. Particle formation is assumed to proceed by both the homogeneous and micellar nucleation mech…
This paper describes the practical application of the UHF Partial Discharge Detection method that VA TECH Reyrolle has routinely applied to high-voltage on-site commissioning tests on gas-insulated substations (GIS) for over 10 years. The location of the partial discharge (PD) sensors has a significant effect on the s…
The addition of HCN to 4-alkylcyclohexanones 1 to give cyanohydrins 2 is strongly catalyzed by hydroxy-ni trile lyases (HNLs). With PaHNL, from bitter almond, trans-addition occurs almost exclusively, yielding trans-2. With MeHNL, from cassava, cis-addition is preferred to give cis-2. cis-Selectivity is nearly quantit…
Residual mechanical stresses from manufacturing always exist in freshly extruded HV cables. These stresses are not uniformly distributed in the cable insulation bulk material. Five different HV cables were analyzed with respect to residual mechanical stresses and dielectric breakdown strength. Photoelastic measurement…
Three simulation methodologies have been employed to investigate the growth, nucleation, and structure of oxides supported on oxide substrates, these are atom-by-atom deposition, layer-by-layer deposition and finally amorphisation of a structure followed by recrystallisation. The materials which have been investigated…
The outcome of the reaction of the bifunctional reagent p-aminophenol (HO-C6H4-NH2) with the cyclic triphosphazene [N3P3Cl6] is very dependent on the solvent, the temperature, and the proton abstractor. In THF at room temperature with K2CO3 the reaction is very slow and takes place only through the NH2 group to give a…
Experimental results on the propagation of positive streamers along contoured, axially symmetric, polytetrafluoroethylene (PTFE) insulation surfaces are presented. A plane parallel electrode configuration provides a substantially uniform electric field for streamer propagation and a point electrode at the ground plane…
Abstract Hoganite, copper(II) acetate monohydrate, and paceite (pronounced ‘pace-ite’), calcium(II) copper(II) tetraacetate hexahydrate, occur as isolated crystals embedded in ferruginous gossan from the Potosi Pit, Broken Hill, New South Wales, Australia. They are associated with goethite, hematite, quartz, linarite,…
Bioassay-guided fractionation of the ethyl acetate extract of the roots of Dalea scandens (Miller) R. Clausen var. paucifolia led to the isolation of new flavonoids, 2( S)-5'-(-1"',1"'-dimethylallyl)-8-(3",3"-dimethylallyl)-2',4',5,7-tetrahydroxyflavanone, 2( S)-5'-(1"',1"'-dimethylallyl)-8-(3",3"-dimethylallyl)-2'-me…
The relaxation of strain in the ZnS epilayers grown on (100) GaP was investigated with resonant Raman scattering measurement. The single LO phonon resonant Raman shift and the intensity increased but the full width at half maximum decreased with the increasing ZnS epilayer thickness. These were attributed to the relax…