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。
Discotic cholesteric phases with extremely small pitches were obtained with cellobiose derivatives as chiral dopants. These binary mixtures tend to form up to three distinct blue phases. An interesting property of these mixtures is that the blue phases can be supercooled to a glass-like state. Microscopic studies, ref…
Structures of the inclusion compounds formed between the host compound 1,1-bis(4-hydroxyphenyl)cyclohexane and the isomers of picoline have been elucidated. The activation energies and the kinetics of desolvation for the complexes have been determined. Competition experiments have been performed to investigate which i…
The ultradispersed diamond (UDD) powders synthesized by the detonation of explosives with negative oxygen balance are new nano-materials with practical value. In this paper, the detonation soot and UDD powders were used as an additive in paraffin oil. This kind of two-phase lubricant possesses excellent load-carrying…
In the presence of [MoH(SC6H2Pri3-2,4,6)3(PMePh2)] in tetrahydrofuran (thf), anhydrous N2H4 disproportionates to N2 and NH3 or is reduced to NH3 by Zn–HOC6H3Pri2-2,6 (69–81% conversion over 16 h). Reaction of [MoH(SC6H2Pri3-2,4,6)3(PMePh2)] with anhydrous N2H4 in thf–MeOH at low temperature gave the complex [MoH(SC6H2…
Synthesis and crystal structure of [C 6 H 10 N 2 ]Pb 2 I 6 ·3thf which contains a novel lead iodide polymeric anion with a double-chain structure.
Soluble matrices of four Scleractinian skeletons (Madrepora, Favia, Leptastrea and Fungia), were extracted and studied by isoelectric focusing (IEF). The main part of the extracted matrices is acidic. IEF gels are poorly stained or unstained by Coomassie Blue and silver. The positive Alcian Blue staining is indicative…
The existing isotropic model equations of hysteresis in magnetic materials have been extended to include the effects of anisotropy and texture. This has proved particularly important as the model has been used to describe an increasing range of magnetic materials in which anisotropy plays a significant role, for examp…
Natural rubber (NR) in a typical semi-efficient vulcanization system was modified with flame-retardant additives such as bromo derivative of phosphorylated cashew nut shell liquid, antimony trioxide and alumina tri hydrate (ATH). Improvement in the flame retardancy of the vulcanizates was shown by the progressive incr…
The approach of simultaneous substitutions by aiming at a systematic dilution of both of the sublattices to obtain the highest possible magnetization in a given system has been made use of, since this parameter is highly desirable in the fabrication of core materials for switched mode power supplies (SMPS), Ferrite se…
The ability to prepare polymer films on the surface of glassy carbon electrodes (GCEs) by electrochemical polymerization of transition-metal complexes of 5-amino-1,10-phenanthroline (aphen) was investigated. Eight different metal ions (Mn II , Fe II , Co II , Ni II , Cu II , Zn II , Ru II and Os II ) were studied. A s…
The pulse width modulation (PWM) inverter is widely used when voltage-frequency regulation is required. When laminated cores are energised by PWM voltage supplies additional losses occur due to flux distortion. The iron loss of three types of grain-oriented 3.25% Si-Fe toroidal cores was measured by means of a compute…
A Lyot-Ohman filter for imaging near the solar He i 1083-nm line is described. Fast and continuous spectral tunability is provided by nematic liquid crystals. This solid-state filter has a free spectral range of 2.35 nm and a spectral resolution of 0.135 nm at the operating wavelength of 1083 nm. A wide-fielded design…
A study of additional loss in an induction motor supplied by a PWM inverter is presented in this paper. The magnetic material used in the motor is characterized, thanks to a suitable Epstein measurement equipment, under several excitation conditions: sine and ideal PWM waveforms similar to the voltage delivered by the…
The effects of calcium and zirconium additions on the microstructures and mechanical properties have been investigated in the squeeze-cast ignition-proof magnesium alloys. The marked grain refining is achieved by the combined addition of calcium and zirconium because calcium promotes the dissolution of zirconium into…
A world-wide test program was undertaken by ASTM Task Group Gl.09.02.03 to assess the relative corrosivity of seawater at 14 test sites. Aluminum alloy 5086 (UNS A95086), 90/10 copper-nickel (UNS C70600), and copper-bearing carbon steel (UNS K01501) test specimens were prepared at one location, shipped to the various…
HETCOR NMR spectra reveal that previous assignments of the stereochemistry of poly(lactide) derived from rac and meso-lactide are incorrect; an alternative assignment is made at the tetrad level of resolution.
The cross-linking reactions and the decomposition processes of three different polysilazane precursors to silicon carbonitride have been investigated systematically in the course of pyrolysis to 1400 °C. The polymer to ceramic conversion chemistry was studied for the following precursors: (ViSiHNH) n (VS), (ViSiHNMe)…
The sensitized polymerization of synthetic lipid bilayers via visible-light irradiation of membrane-bound cyanine dyes is reported. Visible-light-initiated polymerizations were successful with liposomes composed solely or partly of either 1-palmitoyl-2-[10-(2‘,4‘-hexadienoyloxy)decanoyl]- sn -glycero-3-phosphatidylcho…
In situ silica reinforcement of styrene–butadiene rubber (SBR) vulcanizate has been achieved by the sol–gel reaction of tetraethoxysilane (TEOS) using n-butylamine as a catalyst. SBR was vulcanized with sulfur and soaked in TEOS and in an aqueous solution of the catalyst. When hydrochloric acid was used as a catalyst…
A simple method for studying the reactivity of hydrogen-terminated silicon surfaces via transmission FTIR spectroscopy is described. Abraded (100) single crystals of silicon, after etching in ammonium fluoride, show features in the IR spectrum that are assigned to Si–H stretching vibrations. Confirmation of the utilit…