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。
A heavily silicified sub-spherical diatom occurring abundantly close to the upper limits of marine facies in the sedimentary sequences recording a Holocene transgression is named and described; Pseudopodosira kosugii sp. nov. Observations on this form in a recent habitat and growing in cultures show that it grows vege…
Abstract The voltammetry of the molybdosilicate and molybdophosphate complexes, formed by the addition of hexafluorosilicate and phosphate to anacidic sodium molybdate solution, have been defined at gold microdisk electrodes. It is shown that the reaction conditions influence both the kinetics of formation of the comp…
The nucleation of corrosion pits on stainless steel in chloride environments is described in terms of minute transient currents recorded under high resolution. Nucleation is fast, showing a rise time less than 1 ms, and is ascribed to rupture of the passivating oxide film, caused by the formation of microscopic patche…
Adsorption experiments for benzotriazole, (BTAH) on the γ-Al 2 O 3 surface were carried out at 150 and 293 K. The thermal stability of the adsorbed layer was investigated. At low temperatures, adsorption results in the production of a thick condensed layer of BTAH. Strong intermolecular hydrogen bonds are observed. Wi…
A Nd:YAG laser was used for joining a pseudoelastic Ti-51.5 at.% Ni shape memory alloy. Tensile tests on sheet metal of 0.5 mm thickness were performed at temperatures of -40C, +20C and 1 10C, representing the martensitic, pseudoelastic and austenitic condition, respectively. Laser-welded specimens exhibited an ultima…
This paper focuses on accelerated testing procedures that can be applied to XLPE and EPR for high voltage cables and that are aimed to achieve the thermo-electrical endurance characterization of insulation. Several methods and techniques for single and combined thermo-electrical stress are illustrated; indices for the…
Multilayer ZnS/CdS thin films were grown on glass, ITO-covered glass and (100)GaAs substrates by successive ionic layer adsorption and reaction (SILAR) technique at room temperature and ambient pressure. The layers in multilayer thin film structures were nominally 1–6 nm thick and the amount of layers varied so that t…
Ribokinase phosphorylates ribose to form ribose-5-phosphate in the presence of ATP and magnesium. The phosphorylated sugar can enter the pentose phosphate pathway or be used for the synthesis of nucleotides, histidine, and tryptophan. Ribokinase belongs to the PfkB family of carbohydrate kinases, for which no three-di…
Abstract A method of synthesis for cadmium selenide and cadmium telluride clusters is proposed. PhSeSiMe 3 reacts with [CdCl 2 (PPh 3 ) 2 ] to yield a series of cadmium selenide clusters depending on the kind of solvent used. The reaction of PhTeSiMe 3 with CdCl 2 and PEt 3 yields a cadmium telluride cluster. Crystall…
A variety of spectroscopic methods have been used to deduce the solid-state structure of Ag 2 [S(CH 2 ) 5 S] ( 1 ), the yellow compound formed by mixing of Ag + and 1,5-pentanedithiol. Solid-state reflectance UV−vis, X-ray diffraction, cross-polarization magic angle spinning (CPMAS) 13 C NMR, and CPMAS 109 Ag NMR spec…
A range of sub-micron size three-layer toughening particles have been prepared by sequential emulsion polymerization, each type of particle comprising a glassy polymer core, a rubbery inter-layer and an outer layer of glassy polymer, which was functionalized using either glycidyl methacrylate or methacrylic acid. Each…
Abstract Extended X‐ray absorption fine structure analysis (EXAFS) has been used to study supported TiCl 4 /MgCl 2 catalysts containing 1.8 wt.‐% Ti. Adsorbed TiCl 4 was found to exist on the MgCl 2 surface as a dimeric complex. The possible structures of dimeric TiCl 4 complexes on the (100) face of MgCl 2 are discus…
Abstract Degradation of hydrogenated styrene—butadiene rubber (HSBR) having different levels of unsaturation has been studied over a wide range of temperatures under anaerobic and aerobic conditions using thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), IR and NMR spectroscopy. TGA data indic…
Solid state 13 C NMR is used to identify the conformation of alanine residues in minor ampullate gland silk from Nephila clavipes and in a genetically engineered protein based on the consensus sequence of MaSp2, a protein present in low concentrations in major ampullate gland silk. The results of the NMR on minor ampu…
${\mathrm{Er}}^{3+}$-doped ${\mathrm{ZrO}}_{2}\ensuremath{-}\mathrm{C}\mathrm{a}\mathrm{O}$ eutectic crystals with ordered microstructure have been grown by the laser floating zone method. The microstructure consists of alternating 2 \ensuremath{\mu}m thick lamellae of calcia-stabilized zirconia (CaSZ) and ${\mathrm{C…
We present an experimental study of phase-transition avalanches during the stress-induced formation of martensite in a Cu-Zn-Al alloy, with particular attention to the effect of cycling. We have analyzed statistically the amplitudes, durations, and energies of the thermal events accompanying the transition, and found…
Al/PS/c-Si photodiode structures were fabricated with a porous silicon (PS) layer of high porosity. Photosensitivity spectra, current–voltage (I–V) dependences at different temperatures, and electron beam induced current profiles were analyzed. Effects of annealing on the device characteristics were studied. The photo…
1 H NMR spectra of poly(methyl methacrylate) prepared with benzoyl peroxide in toluene at 100 °C were measured on a 750 MHz high-resolution NMR spectrometer. End groups resulting from initiation, chain transfer, and termination reactions were assigned, and the numbers of end groups per polymer molecule were estimated.…
A series of highly ordered ladder-like polysilsesquioxanes (LPS) has been synthesized via "stepwise coupling polymerization" in recent years. Among them some new kind of reactive polymers, such as polyhydrosilsesquioxane, polyvinyl (or allyl) silsesquioxane, polyethoxysilsesquioxane, etc. as parent polymers, can be fu…
We report measurements in natural horse-spleen ferritin that provide a detailed mapping of the blocking temperature, ${T}_{B},$ as a function of magnetic field over a broad range up to 20 kOe. Unlike most superparamagnetic materials where it decreases with applied field, ${T}_{B}$ increases with increasing field at sm…