Materials Literature
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Crystal structure of antiferroelectric PbZrO 3 has been studied at room temperature by adopting X-ray and neutron profile analysis methods. A considerable refinement of the structure has been made on a previous model which has generally been accepted in these 20 years. In contrast to the old model which has a large sp…
The physical origin of losses in conducting ferromagnetic materials is the production of heat by the flow of eddy currents in the material. The eddy currents are generated by the voltages caused by changes in the magnetic induction. This statement, although true, is not very helpful in calculating or predicting the ac…
Abstract Tear strengths have been measured for a wide variety of molecular networks under threshold conditions; i.e., at high temperatures, low rates of tearing, and with swollen samples. For all of the polymers examined, the threshold tear strength was found to be proportional to the square root of the average molecu…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSimultaneous static and dynamic light scatteringS. Bantle, Manfred Schmidt, and Walther BurchardCite this: Macromolecules 1982, 15, 6, 1604–1609Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Published inissue 1 November 1982https://pub…
Abstract The microstructure of semicrystalline polymers solidified with and without concurrent applied strain is reviewed. Fluid flow in the filling and packing stages of injection‐molding are discussed. Observations of the microstructures of a number of polymers under various conditions are described. In general, the…
Amorphous carbon films have been prepared in a r.f. glow discharge from various hydrocarbon gases. Electrical conductivity and optical absorption measurements show a strong dependence on the preparation gas and on the substrate temperature T d. Particularly for specimens prepared from ethylene, varying T d from 230 to…
This paper concerns the dynamic light scattering by suspensions of polydisperse hard spherical particles. It is concluded that for relatively high volume fractions and fairly narrow distributions, the light scattering correlation function should, to a good degree of approximation, be composed of two independent modes…
Abstract Neutral and negatively charged liposomes containing Adriamycin (ADM) were examined for the efficiency of drug entrapment, serum stability, in vivo tissue distribution, and tumor-inhibitory activity. Entrapment of ADM in negatively charged liposomes containing phosphatidylserine (PS) or cardiolipin (DPG) was 3…
An adiabatic scanning calorimeter has been used to study the thermal behavior of the liquid-crystal octylcyanobiphenyl (8CB) in the temperature range between 10 and 50\ifmmode^\circ\else\textdegree\fi{}C. The solid---to---smectic-$A$ ($\mathrm{KA}$), the smectic-$A$---to---nematic ($\mathrm{AN}$), as well as the nemat…
Analytical formulae or the effect of interaction between pairs of rigid spherical particles on the mean velocity of each species in a statistically homogeneous dilute polydisperse system were given in Part 1 (Batchelor 1982), and are here evaluated numerically. We have calculated the pair-distribution function and the…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDinuclear copper(II) cryptates of macrocyclic ligands: synthesis, crystal structure, and magnetic properties. Mechanism of the exchange interaction through bridging azido ligandsJacques Comarmond, Pierre Plumere, Jean Marie Lehn, Yvette Agnus, Remy Louis, Raymond Weiss, Oliv…
X-ray data have been extended to 1.7 A for a binary complex of Escherichia coli dihydrofolate reductase with methotrexate and a ternary complex of Lactobacillus casei dihydrofolate reductase with methotrexate and NADPH. Models for both structures have been refined to R factors of 0.15 and include parameters for fixed…
The CNDO/S3 model, a spectroscopically parametrized complete neglect of differential overlap molecular orbital method, is extended to encompass the description of radical cation states in infinite periodic quasi-one-dimensional molecules. Detailed model calculations of the energy bands and density of valence electron…
The role of hydrogen gas in influencing fatigue-crack propagation is examined for several classes of lower strength pressure-vessel and piping steels. Based on measurements over a wide range of growth rates from 10−8 to 10−2 mm/cycle, crack-propagation rates are found to be significantly higher in dehumidified gaseous…
In a homeotropic nematic cell, a solitarylike director wave is excited by a mechanical method. Three photographs of the wave propagation process and measured velocity-time dependence curves are presented. By means of the interference patterns of focused polarized light, it was found that the dark lines observed in whi…
The reactions of 1,2- and 1,3-dithioles, HSRSH, with Fo 3 (CO) 12 give the dinuclear compounds Fe 2 (CO) 6 (SRS) in good yields. With R = C 2 H 4 or R = C 3 H 6 the trinuclear compounds (CO) 3 Fe(SRS)Fe(CO)(SRS)Fe(CO) 3 containing an open Fe 3 chain are obtained.
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of stickiness in hygroscopic, amorphous powdersGalen E. Downton, Jose L. Flores-Luna, and C. Judson KingCite this: Ind. Eng. Chem. Fundamen. 1982, 21, 4, 447–451Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Published inissue…
It is proposed that the grain-size dependence of the yield stress of metals is due to the elastic incompatibility stresses at the grain boundaries. For clarity, the process of yielding is divided into three stages. In the first stage (prior to microyielding), the differences in elastic properties arising from the elas…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNonplanar conformers and the phase behavior of solid n-alkanesMark Maroncelli, Song Ping Qi, Herbert L. Strauss, and Robert G. SnyderCite this: J. Am. Chem. Soc. 1982, 104, 23, 6237–6247Publication Date (Print):November 1, 1982Publication History Published online1 May 2002Pu…
Very high and broad Curie maxima are observed in ceramic Ba(Ti1‐yZry)O3 mixed crystals, which are often used for the preparation of ceramic dielectrics. The ferroelectric‐to‐paraelectric phase transition of ceramic Ba(Ti1‐yZry)O3 was studied using dielectric measurements, quantitative DTA, X‐ray diffraction, and deter…