Materials Literature
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A new model of scalar static magnetic hysteresis based on the superposition of Krasnoselkii hysterons of stop type is described. Unlike the magnetic hysteresis models known in literature, the present one naturally implements the constitutive relationship H=H[B]. In this respect it allows to formulate a field problem d…
Small-angle neutron scattering has been combined with equilibrium dynamic light scattering to study shear-induced mixing in a diluted high-molecular-weight polymer blend. The data show an enhancement of critical fluctuations upon dilution and are found to collapse onto a universal scaling curve containing no free para…
Initiation of quasicleavage (QC) cracks in delayed fracture of hydrogen charged, quenched and tempered AISI 4340 steel was studied by means of a fractographic technique. The fatal crack leading to the delayed fracture of an unnotched specimen is found not to be caused by intergranular cracking as is commonly found in…
The physical and optical properties of glasses in the As 40 S ((60 ‐ x:) Se x system where x = 0, 5,10,15, and 20 at. % Se have been investigated. The changes in the glass transition temperature, density, hardness, IR edge, and refractive index can be attributed to the presence of Se, which simply replaces S in these…
Abstract We report the crystal and electronic band structures and the electrical, magnetic, and optical properties of {bis(ethylenedithio)tetrathiafulvalene}2dicyano-silver and -gold, η-(BEDT–TTF)2M(CN)2, M = Ag or Au. The compounds belong to the monoclinic system; space group C2/c, a = 36.28(8), b = 4.286(2), c = 22.…
A model has been developed to account for the occurrence of flickers and image-stickings in TN or two-domain TN cells aligned by polyimide (PI) films with one of the films subjected to uv radiations prior to rubbings. The probability of flickers and image-stickings is proportional to the imbalance in the charge densit…
Raman spectroscopy was used to investigate PbTiO3 (PT) and 0.7Pb(Mg1/3 Nb2/3)O3-0.3PbTiO3 (PMN-PT) thin films prepared by the sol–gel technique and deposited on platinum-coated silicon, and Al2O3. The PT spectra reveal that the films are polycrystalline in nature and the frequencies of most of the modes are decreased…
We report here the purification and the crystallization of the modular protein Grb2. The protein was expressed as a fusion with glutathione-S-transferase and purified by affinity chromatography on glutathione agarose. It was apparent from reverse phase chromatography that the purified protein was conformationally unst…
The durability properties of bonded lap shear joints made from an epoxy/dicyandiamide adhesive and zinc, zinc-coated steel, two different aluminium alloys or cold-rolled steel metal coupons have been investigated. The influence of the dicyandiamide content of the adhesive on the durability properties-has been assessed…
Photoexcitation of the oxygen (O)‐to‐metal (M = W, Mo, and Nb), ligand‐to‐metal charge transfer (O→M l.m.c.t.) bands of the polyoxometallomanganates such as K 6 Na 2 [ MnW 6 O 24 ] · 12 H 2 O (1), K 6 [ MnMo 9 O 32 ] · 6 H 2 O (2), and Na 12 [ Mn ( Nb 6 O 19 ) 2 ] · 50 H 2 O (3) leads to an intramolecular energy trans…
Abstract Zinc(II) tetrasulphonatophthalocyanine (ZnPcS4−) exhibited a new absorption band (λmax 699 nm) at the longer wavelength side of the monomer absorption band in 1:49 aqueous acetonitrile. Irradiation of the new band exerted an emission (690–730 nm, λmax 710 nm) different from the monomer fluorescence.The new ab…
<div class="htmlview paragraph">A catalytic converter thermal management system (TMS) using variable-conductance vacuum insulation and phase-change thermal storage can maintain the converter temperature above its operating temperature for many hours, allowing most trips to begin with minimal “cold-start” emissio…
Alcaligenes eutrophus and Burkholderia cepacia synthesized and accumulated a terpolyester consisting of 3-hydroxybutyric acid, 3-hydroxyvaleric acid, and 2-methyl-3-hydroxybutyric acid (2Me3HB) if the cells were cultivated in a mineral salts medium containing tiglic acid as the sole carbon source or in combination wit…
Metallic films of RuO2 were deposited by reactive-sputtering deposition on single crystal substrates of Al2O3 (0001) and SrTiO3 (100) at room temperature and 450 °C. Measurement of the characteristic hysteresis loop revealed that the target’s transition from a metal to a metal oxide surface occurred at a very high O2/…
Soluble cellulose intermediates are converted into carboxymethyl cellulose (CMC) with a high degree of substitution (DSCMC) of up to 2.2 by removing the solubilizing ester groups in an one-step synthesis in dimethylsulfoxide (DMSO) with suspended solid NaOH powder as a base and monochloroacetate within 4 hours at 70°C…
In the presence of a nonuniform distribution of spin interactions in ferromagnetic perovskite materials, thermally activated magnetic domains appear. These domains are different from ordinary static ferromagnetic domains, rather their structures depend on temperature, magnetic field, and details of the distribution of…
Abstract Copolyesters of poly(ethylene terephthalate) (PET) with a liquid crystalline polymer (LCP), SBH 1:1:2, have been synthesized by the polycondensation, carried out in the melt at temperatures up to 300°C of sebacic acid (S), 4,4′‐dihydroxybiphenyl (B), and 4‐hydroxybenzoic acid (H) in the presence of PET. The P…
Ferroelectric liquid crystals with high enough spontaneous polarization (Ps > 50nC/cm2) exibit a special periodic structure which forms after switching off a moderate electric field. One of the most important features of this new structure is the existence of inclined smectic layers with opposite signs of the inclinat…
The response of thermoluminescent dosimeters to electron irradiations depends on the radiation dose, mean electron energy at the position of the dosimeter in phantom, and the size of the dosimeter. In this paper the semi-empirical expression proposed by Holt et al. [Phys. Med. Biol. 20, 559-570 (1975)] is combined wit…
Abstract Electrochemical properties of the titled complex in dichloromethane (DCM) solutions have been investigated by cyclic and rotating-disk-electrode voltammetry. Two successive reversible one-electron reduction waves (E1/2 = −0.23 and −0.65 V vs. ferrocene/ferricinium+, respectively) and one irreversible oxidatio…