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。
Raman spectra of the hydroxyl-stretching region of a low defect kaolinite were obtained at temperatures between ambient and the predehydroxylation temperatures of 500 °C, using a Raman microprobe equipped with a thermal stage. At 25 °C, Raman bands of the kaolinite hydroxyl stretching region were observed at 3691, 368…
It is well known that the Cr underlayer plays significant role in the magnetic properties of Co alloy film. In this study, the effects of the underlayer materials such as Cr, Mo, W, W/Cr, and Al and their thickness on the magnetic properties of SmCo films were studied. In the x-ray diffraction diagrams of the SmCo/Cr…
By diluting a ferroelectric columnar liquid crystal with dodecane as apolar organic solvent, soft columnar phases as well as the chiral columnar nematic phase (Nc*) were achieved as lyomesomorphic systems. All obtained lyomesophases exhibited polar switching over a wide temperature range, even down to room temperature…
The effect of carbon doping on the structural and magnetic properties of Mn5Si3Cx films is investigated for different substrate temperatures TS and concentrations x. Samples with x≈0.75 prepared at TS=650–750 K exhibit ferromagnetic order with enhanced ordering temperatures TC well above room temperature in contrast t…
The corrosion performance of sand cast MEZS, zirconium-grain-refined MEZR, sand cast AZ91S, and high pressure diecast AZ91D magnesium alloys were evaluated by means of salt spray testing, optical metallography, hydrogen evolution, polarisation curve measurement and AC impedance spectroscopy. The results show that the…
The self-heating of Si devices operating in the 4 K<T<300 K range is discussed in this work. The temperature-dependent thermal time constant of a typical Si chip is calculated and compared to several electrical relaxation times. Thermal events may be indistinguishable from electrical events at low temperatures, and th…
The reaction of hexakis(2,4,6-triisopropylphenyl)tetrasilabuta-1,3-diene R2Si=SiR–SiR=SiR2 (1) with atmospheric oxygen furnishes the oxidation product R2Si(O)2SiROSiR(O)2SiR2 (5) by oxygen insertion into all Si–Si bonds. However, treatment of 1 with meta-chloroperoxobenzoic acid provides R2Si(O)2SiR–SiR(O)2SiR2 (7) wi…
Previous studies have identified four cis-response elements which mediate the basal transcriptional activity of the human alpha2(I) collagen gene. One of these elements, a pyrimidine-rich region (TCCCCC motif), was shown to be a repressor site, and the other three elements were shown to be activator sites. Furthermore…
Mn K-edge fluorescence data are presented for thin-film samples $(3000\AA{})$ of colossal magnetoresistive (CMR) ${\mathrm{La}}_{0.67}{\mathrm{Ca}}_{0.33}{\mathrm{MnO}}_{3}:$ as deposited, and post annealed at 1000 and 1200 K. The local distortion is analyzed in terms of three contributions: static, phonon, and an ext…
Our studies of compressively strained La0.7Sr0.3MnO7 (LSMO) thin films reveal the importance of domain structure and strain effects in the magnetization reversal and magnetotransport. Normal and grazing incidence x-ray diffraction indicate that the compressive strain on these LSMO thin films on (100) LaAlO3 is not com…
Giant magnetostriction (GMS) reported until now in exchange-coupled multilayers (ECML) present quasi-isotropic magnetostrictive behavior. In the present work it is shown the possibility to induce highly anisotropic GMS at low field with the single domain state in (TbFe/Fe)n multilayers when deposited by ion sputtering…
Two types of textured, fully dense NdFeB hydrogenation, disproportionation, desorption, and recombination (HDDR) magnets were produced. The first type was produced by hot pressing isotropic HDDR powder followed by die upsetting; the second, by hot pressing prealigned, anisotropic HDDR powder (MQA-T). Studies of the ma…
Der Inninger Bach stellt den Abfluss des Wörthsees (Bayern) dar. Im Verlauf des kalkreichen Gewässers wurde die Makrophytenvegetation kartiert sowie Messungen der Nährstoffkonzentrationen im freien Wasserkörper und im Sediment durchgeführt. In jedem Kartierabschnitt wurde der Makrophytenindex für Fließgewässer (TIM) b…
Barium ferrite thin films with perpendicular c-axis orientation and small grain size (about 300 Å) were successfully fabricated with careful control of sputtering conditions. The c-axis orientation of barium ferrite thin films is most sensitive to the oxygen partial pressure during deposition. All samples with oxygen…
Lamellar crystals of the monodisperse 10-amide nylon 6 oligomer were prepared from solution. The crystal structure and morphology were studied using electron microscopy (diffraction and imaging) from individual lamella and X-ray diffraction data from sedimented oriented mats. The lamellar stacking periodicity (LSP) wa…
The growth of spherulites of poly(ethylene oxide) in blends with poly(hydroxyether of bisphenol A) was investigated. In a very narrow range of crystallization temperatures, the spherulite growth deviates from the usual constant growth rate regime in a systematic manner in which the growth rate decreases with time. Thi…
Abstract We propose a novel wide‐view polarizer with extremely low light leakage in all directions. This wide‐view polarizer has advantage of high achromaticity. By applying this polarizer to the IPS mode and the R‐OCB mode, we have confirmed to obtain excellent wide viewing angle in its black state.
Tilted smectic phases of achiral banana-shaped molecules are polar and may form a number of different states (chiral or racemic, antiferroelectric or ferroelectric), which can be interchanged by external fields. In thin films they may assume various layer structures (vertical, tilted or horizontally modulated), which…
The fire retardant action of red phosphorus in nylon 6 was im proved by co-addition of ferric/ferrous oxides. It was found that the activity of Fe oxides depends on the product grade. Polymer formulations, non-ignitable in air were obtained by co-addition of Fe 3 O 4 /Fe 2 O 3 = 3:2 with red phosphorus. Scanning elect…
Within the wealth of hydrocarbon polymers, poly(p-phenylene alkylene)s (“alkarotics”) hold a special position since they have been a long forgotten class of hydrophobic polymers. This is somewhat surprising, since the cornerstones of this polymer family cover extremely broad materials properties and the few known repr…