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。
Single crystals of NaCl, LiF and MgO were deformed at strain rates of 105 s−1 by impacting them with glass and tungsten carbide spherical particles of diameter in the range of 0·4-G l·0 mm. By measuring the incident and rebound velocities and the size of the residual indentation, the dynamic hardnesses of these materi…
The changes in density of specific tissues after administration of intravenous contrast agents is easily detectable by computed tomography and is important in distinguishing normal and pathologic tissues. The time course of these density changes was determined in nine specific tissues in the rat by measuring tissue ra…
A model to predict the forces on conical-nosed penetrators for normal impact into dry rock targets is developed. The target medium is described by a linear hydrostat, a linear shear failure-pressure relation, and the material density. A cylindrical cavity expansion approximation to the target response permits one-dime…
Abstract The course of intermolecular reactions induced by peroxide decomposition in linear polyethylene has been determined and compared with similar reaction systems in which the substrate is a lowmolecular‐weight alkane. Efficiency of intermolecular coupling is 40% for an alkane and 25–30% for the polymer system. C…
Electrostrictive terms have been introduced into the simple Kittel free-energy function for antiferroelectrics. An additional coefficient W is found to be required to take account of the interaction with the sublattice polarizations, and Q and W values have been calculated from experimental data for typical antiferroe…
Abstract Analysis of the distribution of gibbsite in soils and saprolites of Galicia, NW Spain, leads to the conclusion that this mineral is mostly formed by inorganic mechanisms in open, well-drained and desaturated systems in the initial stages of weathering of various aluminosilicates, especially plagioclases. No e…
Dips were observed in the distribution curves of the deposition rates of ZnO films prepared both by planar diode and by planar magnetron sputtering. These dips are ascribed to high-energy neutral atoms bombarding the films. The influence of high-energy neutral atoms on the mixed orientation of ZnO film is also investi…
Summary Estimates of rain drop impact stress were made from measurements of the penetration of water drops through nylon meshes, from analysis of cine photographs of splash and from the output of a force transducer. Results indicated maximum stresses of 2–6 MPa acting for about 50 microseconds on the perimeter of a ci…
The Bi 2 O 3 ‐PbO phase diagram was determined using differential thermal analysis and both room‐ and high‐temperature X‐ray powder diffraction. The phase diagram contains a single eutectic at 73 mol% PbO and 635°C. A body‐centered cubic solid solution exists above ∼600°C within a composition range of 30 to 65 mol% Pb…
Adsorption of electron acceptors on partially reduced TiO 2 leads to the localization of mobile conduction band electrons which is indicated by the appearance of an ESR signal with g = 2.003. The localization process is accompanied by an electron transfer from donor centers in reduced TiO 2 (Ti 3+ ions) to adsorbed mo…
The strength of diamond is usually measured using an indentation technique. It is shown that the values obtained by previous workers for good quality diamond are reasonably consistent if they are all calculated with the same chosen values of modulus and Poisson ratio. By monitoring the extent of crack growth from bene…
The Raman laser temperature-jump technique has been used to measure the kinetics of the coil to helix reaction of poly(cytidylic acid) [poly(C)] in aqueous cosolvent mixtures. The rate of helix formation has a low activation energy and is proportional to reciprocal solvent viscosity. The observations suggest helix for…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOxidation of manganese(II) phthalocyanine by molecular oxygenA. B. P. Lever, J. P. Wilshire, and S. K. QuanCite this: Inorg. Chem. 1981, 20, 3, 761–768Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published inissue 1 March 1981https://pu…
Abstract The impact modification mechanisms of polycarbonate (PC) blended with polyethylene (PE) and blends of polyxylenol ether (PXE)/high impact polystyrene (HIPS), were studied using a volume dilation technique. With two extensometers, measurements of volume change during tensile deformation were made on the plasti…
Mixed crystals Pb3(PO4)2--Pb3(AsO4)2 are ferroelastic at low temperatures. The phase diagram contains three different phases a (paraelastic), \tt b and \tt c (both ferroelastic). The transformation \tt a-\tt b is first order for Pb3(PO4)2 and approaches second-order behaviour with increasing As content. The spontaneou…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTUnusual platinum complexes of deprotonated 1-methylcytosine: bis(.mu.-1-methylcytosinato-N3,N4)-bis(cis-diammineplatinum(II)) dinitrate dihydrate, [(NH3)2Pt(C5H6N3O)2Pt(NH3)2](NO3)2.2H2O, and [diaquahydrogen(1+)][bis(.mu.-1-methylcytosinato-N3,N4)-bis(cis-nitrodiammineplatin…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTElectrochemical and spectral speciation of iron tetrakis(N-methyl-4-pyridyl)porphyrin in aqueous mediaPaul A. Forshey and Theodore KuwanaCite this: Inorg. Chem. 1981, 20, 3, 693–700Publication Date (Print):March 1, 1981Publication History Published online1 May 2002Published…
Crystallographic data concerning geometric properties of hexagonal lattices of Cα, Zn, Beα, Tiα, Zrα, Mg and Cd are obtained from two different computation techniques. These properties are related to the relative orientations of identical hexagonal lattices 1 and 2 which superimpose two multiple cells M1 and M2 within…
The saturation magnetostriction of permalloy films has been measured as a function of film composition. In general, the data obtained agrees with the published values for bulk polycrystalline permalloy. It has further been established that the composition for zero magnetostriction is at about 81.5 (wt.)% Ni. The exact…
Changes which occur on the surface of mild steel coupons submerged in cultures of an Fe(III)-reducing bacterium, isolated from corroded pipe systems carrying crude oil, were studied microscopically to investigate the interaction between the corrosion-causing bacterium and the corroding mild steel coupon. Under micro-a…