Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual metalloporphyrins. XVI. Preparation and purification of tetrasodium meso-tetra(p-sulfophenyl)porphine. Easy procedureTapeshwari S. Srivastava and Minoru TsutsuiCite this: J. Org. Chem. 1973, 38, 11, 2103Publication Date (Print):June 1, 1973Publication History Publish…
It is shown that the correlation of the threshold stress for stress corrosion cracking (SCC) of plain specimens and of KISCC for precracked specimens in a Mg 7% Al alloy immersed in K2CrO4/NaCl solutions is explicable in terms of the formation of cracks that do not propagate to total failure in plain specimens stresse…
A mechanism believed responsible for the explosive vapor growth observed in Armstrong’s experiment with LMFBR materials (liquid sodium injected into molten UO2) is discussed. Basically, liquid sodium globules can be entrained and wet the liquid UO2 surfaces. The lack of nucleation sites in the liquid-liquid-like syste…
Abstract The small‐angle x‐ray scattering (SAXS) patterns of a number of linear polyethylene (PE) and polyoxymethylene (POM) samples have been measured and compared to the intensity functions of one‐dimensional paracrystalline lattices. It was found that the ratio of the angular positions of the second and first scatt…
Abstract The crystal structure of nylon 12 prepared by polymerization of dodecalactam has been determined by x‐ray diffraction. Nylon 12 fiber exhibits only the γ form as its stable crystal structure. The unit cell of nylon 12 was determined with the aid of the x‐ray diffraction pattern of a doubly oriented specimen.…
Abstract The intensities and other spectral parameters of the main components of infrared amide bands for the random and anti‐parallel pleated sheet forms have been determined for poly‐S‐carbobenzoxymethylcysteine, poly‐ S ‐carboxymethylcysteine, polylysine and silk fibroin of Bombyx mori in heavy water solutions and…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDecomposition of Hydrazine on Shell 405 Catalyst at High PresureStanley E. Wood and James T. BryantCite this: Ind. Eng. Chem. Prod. Res. Dev. 1973, 12, 2, 117–122Publication Date (Print):June 1, 1973Publication History Published online1 May 2002Published inissue 1 June 1973h…
The spontaneous electric polarization Ps has been measured for Gd2(MoO4)3 over the temperature range from 4.2 °K to the Curie point. Near 4 °K the maximum Ps is slightly less than 0.29 μC/cm2 with a very low temperature coefficient. An electric field enforced phase transition from paraelectric to ferroelectric at temp…
Oxidation states of palladium-loaded Y zeolites were measured by ESR and IR spectrometry. After treatment by oxygen at 500µC the Pd is almost in the Pd(II) form, and few Pd (1%) are found in the Pd(III) form. After reduction by hydrogen at room temperature the Pd at zero oxidation state is almost atomically dispersed.…
The elastic resistance to bending of woven fabrics has previously been considered in terms of the existence in the yarns of rigid and elastic sections. The difficulties inherent in such a model and the noticeable differences between the predicted and experimental findings are examined in this paper. Two models of a pl…
The magnetic properties of NiO have been analyzed under the assumption that it is very nearly equivalent to four interpenetrating quasi-independent simple cubic lattices. The bilinear next-nearest-neighbor superexchange parameter ${J}_{2}$ is estimated using the low-temperature powder susceptibility, N\'eel temperatur…
The preparation and physical properties of a group of polyether-polyester copolymers are described. Where the polyester component has a high homopolymer melting point, the resulting copolyesters are tough, resilient, thermoprocessable elastomers. Polymer hardness and modulus characteristics may be varied from a fairly…
The design of the joints in a power transformer core has a marked influence on the efficiency of the core as a whole. Two experimental cores have been built such that the lengths of their 45° mitered overlaps could be varied from 0 to 2.0 cm. The larger core, with 1.0 m limbs, was used for investigating flux and loss…
A new X-ray diffraction method for the determination of crystallinity of polymers is reported. A probability function is used to express the intensity distribution of an amorphous halo. The intensity of the halo buried under any crystalline peak can be calculated by this function. An amorphous-standard-addition method…
The orientations of the hydoxyl groups in the minerals kaolinite, dickite and nacrite have been determined by an iterative process based on the minimization of the total electrostatic energy of the respective crystal structures. The hydroxyl shared by the tetrahedral and octahedral sheets is directed toward the empty…
A continuum theory of nonlocal electromagnetic elastic solids is proposed. Nonlocal and local balance laws and jump conditions are obtained. Through the use of an extension of Clausius-Duhem inequality, encompassing nonlocal effects, E-M momentum and constitutive equations are derived and restricted.
Abstract The chemical, physical, and mechanical changes in the surface properties of poly‐(ethylene terephthalate) film produced by ultraviolet light have been examined. Attenuated total reflection infrared spectroscopy has indicated that numerous chemical scission reactions occur in the front surface layer facing the…
A procedure is described for obtaining the standard deviations in cell dimensions derived front powder patterns by Cohen's method of least squares. The analysis applies to any crystal system and the error in the volume of the cell is evaluated. The method is particularly suited to the study of minerals where isomorpho…
Slip and twinning are the two fundamental modes by which metals and alloys can deform plastical1y. Slip occurs when crystal planes glide past each other. This is achieved by the passage of dislocations on different glide planes. Since the Burgers vector of the glide dislocations is always a lattice vector, the atoms d…
LiInS2 is an AIBIIIC2VI ternary semiconductor crystallizing with mm2 symmetry. The useful transparency range is 0.5–8 μ, over which we have measured the refractive indices. The optical nonlinear coefficients for second harmonic generation have also been measured. The nonlinear figure of merit is comparable to that of…