Materials Literature
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The direct current electrical conductivity tensor of biotitic phyllosilicates (mica) has been measured as a function of temperature, of electric field, and of chemical composition. It is found that conductivity depends exponentially upon iron impurity content, and upon electric field at high fields. The dependence upo…
Cross‐linking methods have been investigated to determine their effect on the performance of polyvinyl alcohol (PVA) films as alkaline battery separators. The following types of cross‐linked PVA films are discussed: ( i ) PVA‐dialdehyde blends post‐treated with an acid or acid periodate solution (two‐step method, and…
It is orthorhombic with a 13.85(4), b 13.58(3), and c 9.65(3)Aa; a sub-cell with c9 = c/3 is strongly evident. The X-ray powder pattern demonstrates an isostructural relationship with gageite; the strongest reflections are: 9.59(40)(110), 6.77(80)(020), 3.378(45)(410), 3.278(40)(140), 2.714(100)(050,510), 2.674(75)(15…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLow-temperature metallic conductivity in a metallomacrocyclic crystal: nickel phthalocyanine iodideJens Martinsen, Richard L. Greene, Sharon M. Palmer, and Brian M. HoffmanCite this: J. Am. Chem. Soc. 1983, 105, 3, 677–678Publication Date (Print):February 1, 1983Publication…
Abstract Raman spectra have been obtained from multimicrogram samples of crystalline transplutonium (americium through einsteinium) orthophosphates. Spectra were also obtained for americium, curium, and californium trimetaphosphates. Assignments of the major Raman bands and confirmation of the compounds' stoichiometry…
Measurement of the anisotropy of turbidity of aligned nematic liquid crystals in three selected geometries can yield the splay, twist, and bend elastic constants (K11, K22, and K33, respectively) which, along with the viscosity coefficients of the medium, govern director fluctuations that lead to a strong light scatte…
Measurements of the critical partial pressure of SiO, Pc, required for the initiation of avalanche nucleation, as a function of ambient temperature in the system Mg–SiO–H2 have been obtained over the temperature range 750<T<1015 K. These are compared to similar measurements of Pc for the SiO–H2 system. I…
The use of a macromolecular model building program, CORELS , which fits a series of constrained groups to a set of approximate guide coordinates, while simultaneously restraining the stereochemistry between groups, is described for protein molecules. The results of an application of this program to hen egg white lysoz…
The "Starfish" project is a long term program of applied research that attempts to provide a sufficiently rigorous working method and a sufficiently comprehensive data base so that a rational system may gradually be developed for reliably predicting the shrinkage and dimensional properties of finished, knitted cotton…
The radiological consequences of using fly ash as a component of cement are discussed. Measurements of the activity concentrations of the fly ash and cement are reported together with measurements of emanation coefficients and exhalation rates. The radon-exhalation rate was found to be significantly lower in concrete…
Abstract Characteristics of cylindritic crystallization of polypropylene were studied by means of optical microscopy. It has been shown that a distinct structural memory effect is observed during the cylindritic crystallization. This memory effect can be attributed to thermal stability of row nuclei giving rise to the…
The structure of dihydroxo(5,10,15,20-tetraphenylporphinato)phosphorus(V) hydroxide dihydrate, (C4H3,,02P+)(OH-).2H20, \nhas been determined from three-dimensional diffractometer data. It crystallizes in the monoclinic space group P2,/c with \na = 14.636 (4) A, b = 13.953 (3) A, c = 17.592 (4) A, /3 = 90.21 (2…
Radiographic and histologic studies were carried out in rats and dogs after the instillation of Barosperse, Hypaque-35%, metrizamide, MP10013 (a nonionic iodine-containing agent), and isotonic saline into the lungs of these animals. In addition, blood gases were examined using these agents in dogs. Given aspiration of…
The Urbach tail features of normal and obliquely deposited Ge- and As-based chalcogenide films have been investigated. A correlation of these features with composition, angle of deposition, photoinduced edge shift, average coordination number, and photoinduced volume contraction has been established. The far infrared…
Abstract The crystal structure of Sr 2 MgSi 2 O 7 with tetragonal, a = 7.9957(10), c = 5.1521(9) Å, Z = 2, space group P [unk]2 1 m has been refined to R = 4.3% from three-dimensional single-crystal, X-ray diffraction data by full-matrix least-squares calculations. This compound is completely isomorphous with åkermani…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMetal homoenolate chemistry. Isolation and reactions of titanium homoenolates of estersEiichi Nakamura and Isao KuwajimaCite this: J. Am. Chem. Soc. 1983, 105, 3, 651–652Publication Date (Print):February 1, 1983Publication History Published online1 May 2002Published inissue…
Abstract Metallic radii, which are obtained from atomic distances in the pure elements, are generally used for the calculation of distances in intermetallic compounds. However, the procedure for using such radii depends on the individual structural type: (a) For high coordination numbers and only slightly differing di…
This paper presents the potential use of a robotic end-effector for acquiring single plies from a stack of fabrics. This type of end-effector would be required to integrate robots into present-day garment manufacturing operations. Two design concepts, pins and temporary adhesion, were shown experimentally to successfu…
Measurements of magnetization, susceptibility, thermal expansion and electrical resistivity have been carried out on the RMn 2 compounds with R=Gd, Tb, Dy, Ho and Er. Magnetization measurements were made on the single crystals for all the compounds. A simple ferrimagnetic structure is observed at 4.2 K for GdMn 2 , Ho…
The core structure of edge dislocations produced during the prismatic slip mode in α-titanium has been determined by high resolution electron microscopy. The core was extended in the prismatic plane with a width equal to 12 Å. Irrespective of the exact dissocation scheme, this gives a stacking fault energy close to 15…