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。
The nuclear quadrupole resonance frequencies of the halogen atoms in the trihalide ions 13 and Ibr2 in some of their crystalline salts have been measured. The results have been correlated with a simple LOAD-MO bonding description and the charge distributions in the ions have been calculated. These ions can be regarded…
Abstract The stress‐system curves have been measured for isotropic and oriented specimens of poly(ethylene terephthalate) in extension, shear, and compression. It was found that for all these types of deformations there was an intrinsic yield drop, i.e., a fall in true stress. It is concluded therefore that the stress…
A durable-flame retardant based on tetrakis (hydroxymethyl ) phosphonium hydroxide (THPOH), urea, and trimethylolmelamine has been developed and applied to cotton fabric. The process is accomplished by padding fabric through a water solution of the three components to a wet pickup of about 75%, drying at moderate temp…
The maximum usable thickness of specimens, below which dislocation images were observable by transmission, was studied experimentally in the region 50–500 kV in the previous work [Japan J. appl. Phys. 6 (1967), 557]. The present work is a continuation of the previous one. The maximum usable thickness was determined by…
Skeletonema tropicum is distinguished from S. Costatum in possessing a greater number of chromatophores than the latter. S. tropicum is to be found north of the equator as far as latitude 30° in the western Atlantic Ocean, whereas the ubiquitous S. costatum extends into the cold waters farther north. The reason for th…
SUMMARY On the crystallinity of illite in diagenesis and anchimetamorphism A simple method to estimate the degree of “crystallinity” of illite has been used for several years in three French laboratories. Many results, which are unpublished, were obtained; three examples are presented in this paper. They show the sens…
The conductivities of 1.2, 7.9 and 12.6 ppm (weight ratio) Li-substituted NiO are measured at high frequencies up to 24 GHz in the temperature range 110° to 450°K. The conductivity at high frequencies can be expressed as the sum of a temperature-dependent conductivity σ 1 and a temperature-independent additive conduct…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTREMOVING INCLUSIONS FROM CRYSTALS BY GRADIENT TECHNIQUESWilliam R. WilcoxCite this: Ind. Eng. Chem. 1968, 60, 3, 12–23Publication Date (Print):March 1, 1968Publication History Published online1 May 2002Published inissue 1 March 1968https://pubs.acs.org/doi/10.1021/ie50699a00…
Summary Electron‐microscope studies of the clay fractions of red soils have shown that free iron oxides are present as small (50–100 A diam) discrete particles frequently clustered to form larger irregular aggregates. Although no evidence of iron‐oxide coatings on clay minerals was found, an association of some of the…
Abstract Most lipids do not pass, on heating, directly from a crystalline structure to an isotropic structure. They are often characterized by a number of intermediate phases, ranging from the plastic crystal, where the center of gravity of the molecule may rotate about one or more axes while the three‐dimensional ord…
When a small amount of Ba or Sr is substituted for Pb in Pb(Mg 1/3 Nb 2/3 )O 3 ‐PbTiO 3 ‐Pb2rO 3 , the morphotropic boundary and the compositions which show the highest planar coupling coefficient and dielectric constant shift slightly toward the decreasing PbTiO 3 content. The tetragonality of Pb(Mg 1/3 Nb 2/3 )O 3 ‐…
Octahedral ferrous chelates based on the hydrotris (1-pyrazolyl) borate ligand can be prepared which are fully high spin, or are fully low spin, or have an intermediate magnetic moment which is strongly temperature dependent. Mössbauer and magnetic susceptibility data characterizing this behavior in the solid state ar…
These experiments were designed to determine the degree and kind of variability in the structure of the community that one might expect under very similar ecological conditions. The results of these experiments show that 95.5% to 98.0% of the specimens composed the same species in the eight communities. About 5% of th…
Abstract The dynamic mechanical properties of a polyimide (poly‐4,4′‐oxydiphenylene pyromellitimide) were studied from about 4 to 800°K. at audio frequencies. A prominent relaxation associated with absorbed water content occurs near 230°K. Below 270°K., the modulus undergoes a corresponding increase in value with incr…
Summary Red soils representing the major groups in which iron oxides are thought to exert a favourable effect on physical properties, have been treated with Na‐dithionite and citrate, or Na‐dithionite and 0.05 n HC1. These treatments removed the free iron oxides and some aluminium oxides and silica. Changes in the phy…
We have observed an anisotropic EPR spectrum in a frozen solution of the low-spin (S = 12;) hemoprotein ferricytochrome c. These results are interpreted in terms of the theory for the low-spin ferric ion in an octahedral crystal field which is subject to an (axial) distortion along the axis perpendicular to the heme p…
Cobalt was deposited in ultra-high vacuum onto (001) copper surfaces prepared inside the vacuum chamber. If the copper substrate was at room temperature during film growth then the cobalt grew approximately as a monolayer. The structure and lattice parameter of the cobalt remained the same as the copper until its thic…
The effect of pH on the spontaneous-passivation characteristics of AISI Types 304, 430 and 410 stainless steels has been studied by means of anodic-polarization and potential-time techniques. An inverse linear relationship between the logarithm of the critical current density for passivity and pH was found to hold tru…
Salt pollution on outdoor insulators has been a serious problem in Japan, and steady efforts have been made to prevent flashover faults on polluted insulators. As a part of such efforts, a simple method of artificial pollution test has been developed to evaluate the flashover characteristics of polluted insulators, es…
Abstract Unsteady‐state water sorption measurements have been carried out over the temperature range 27–40°C. on a polyurethane elastomer composed of MDI, 1,4‐butanediol, and polybutylene adipate (MW 2000) in the mole ratios 3.2:2:1. The sorption isotherm is concave upward above an activity of 0.6, reaching a saturati…