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。
Calcite collectors often ask, “How many kinds of calcite twins are there?” The answer is hard to give because the word kinds is ambiguous. The question can be given an unambiguous answer, however, if the question is rephrased: “How many twin laws are there for calcite?” In this case, the answer is “four.” I will go fu…
The pressure dependence of the optical absorption edge of In1—xGaSe (0 < x < 0.2) and GaTe has been investigated in order to determine the direct to indirect crossover pressure and the energy difference between the absolute and subsidiary minima of the conduction band at ambient pressure. In the In1—xGaSe alloy, the c…
During the recrystallization microalloyed Sn in non-oriented electrical steel segregates to the surface and on grain boundary and affects the texture development. In spite of the fact that the grain boundary segregation is much smaller compared to surface segregation, both have an influence on recrystallization and on…
The chemical bond parameters, that is, bond covalency, bond susceptibility, and macroscopic linear susceptibility of La1−xCaxCrO3 (x=0.0, 0.1, 0.2, 0.3) has been calculated using a semiempirical method. This method is the generalization of the dielectric description theory proposed by Phillips, Van Vechten, Levine, an…
Batch culture of Alcaligenes latus, American Type Culture Collection 29713, was investigated for producing the intracellular bioplastic poly(b-hydroxybutyric acid) (PHB). A central, composite experimental design was used to optimize the composition of the culture medium for maximizing the productivity of PHB. Investig…
The topic of this paper is bipolar organic compounds containing both charged electron donor and electron acceptor groups interconnected by various kinds of bridges (–D–X–A+). Such betaines are subject to photoinduced intramolecular electron transfer (PIET), large change in dipole moment in the excited state and consid…
(1999). Super-Hard Wear-Resistant Coating Systems. Materials Technology: Vol. 14, No. 3, pp. 126-129.
The ferroresonant behaviour of a 275 kV electromagnetic voltage transformers, fed from a sinusoidal supply via circuit breaker grading capacitance, in a National Grid substation in analysed using nonlinear bifurcation diagrams representing system behaviour have been presented showing two possible types of operation, n…
Department of Chemistry, Yonsei University, Seoul 120-749, KoreaReceived November 10, 1998The polyaniline films with various insoluble parts are fabricated. The oxidation state (1-y) of these polyanilineis 0.53 and 0.54, respectively. To control the interchain and intrachain interaction of the polymer, the polya-nilin…
Previous work has shown that polymethacrylates with highly tapered side groups, such as poly{2-{2-[2-(2-methacryloyloxyethoxy)-ethoxy]ethoxy}ethyl-3,4,5-tris-(p-dodecyloxy-benzyloxy)benzoate} (H12-ABG-4EO-PMA), form columnar hexagonal (Colh, previously designated φh) liquid crystalline structures. The small angle X-ra…
Sodium 4-nitrophenolate 4-nitrophenol dihydrate is a new nonlinear optical crystal of C2 monoclinic symmetry composed of two distinct organic chromophores of respective calculated molecular hyperpolarisabilities β xxx =18.2×10 –30 and 5.2×10 –30 esu. The chromophores are organised in herringbone motifs along inorganic…
The DC and AC conductivity of composites with epoxy resin and nickel particles was investigated for various content of nickel powder from ambient to 120 °C. AC conductivity was measured in the frequency range 10 Hz to 13 MHz. An enhancement of conductivity was evidenced increasing conductive filler content and tempera…
System design of cold weather protective clothing is a critical process, as it involvesconsideration of the effects of a number of external and internal parameters like environmental factors and physical, physico-mechanical and psychological parameters. The bulk and weightof the textile materials used in protective cl…
The effect of oxide shape on magnetic properties of semiprocessed nonoriented electrical steel sheets produced by single reduction cold rolling process was studied. When oxides in steel sheets were elongated inclusions which were prescribed as B type by JIS, the oxides inhibited grain growth during consumer annealing…
Acid-mediated cleavage and rearrangement of (c-C6H11)6Si6O9 1 by triflic acid (TfOH) and methanesulfonic acid (MsOH) produces good yields of C2-[(c-C6H11)6Si6O8X2] (4a, X = OTf; 4b, X = MsO), which reacts with water, LiNMe2 and LiCCPh to afford C2-[(c-C6H11)6Si6O8(OH)2] 5, C2-[(c-C6H11)6Si6O8(NMe2)2] 8 and C2-[(c-C6H1…
Ultrathin fluoropolymer films were deposited by a plasma-enhanced chemical vapor deposition process, from mixtures of hexafluoropropylene (C3F6) and octafluoropropane (C3F8) precursors. Different monomer feed compositions result in different rates of deposition. The C3F6 is the primary polymerizing species and C3F8 ac…
Shear bands (SBs) in cold-rolled austenitic stainless steel 310S have been investigated by using transmission electron microscopy (TEM). Shear Bands appear in the region of twin-matrix lamellae which have already developed at moderate strain. Inside the shear band, fine grains are observed, and the shape of each grain…
Structural investigations of the compounds in the series Ba 0.27 Sr 0.73 Zr y Ti 1- y O 3 have been carried out. The crystal structure goes to lower symmetry with increasing Zr content and the tolerance factor decreases. The variation of V a / V b is linear with the tolerance factor. The tilt system is a - a - c 0 for…
The results of an investigation of the electronic structure of lithium tetraborate crystals using experimental (x-ray photoelectron spectroscopy) and theoretical (quantum-chemical modeling) methods are reported. The experimental spectrum of the valence-band states of the crystal lies 2–15 eV below the Fermi level and…
To predict phase selection in a ternary eutectic system, approximate growth models of eutectic cells are proposed. Two models are proposed. The first assumes that the growth adjustment should be governed by elimination and branching of the two solid phases and assumes the extreme condition and uses the Burden-Hunt mod…