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 reaction of NH 4 TcO 4 with PPh 3 in DMF solution in the presence of HCl produces mer-Tc iii (PPh 3 ) 2 Cl 3 (DMF)•2PPh 3 (1). When the reaction is done in acidic DMA, the yellow product isolated was identified as NH 2 (CH 3 ) 2 + DMAH + [TcCl 6 ] 2− •PPh 3 O (2). The dimethylammonium cation was produced from the…
Lattice strains have been measured by neutron diffraction from the alumina matrix in alumina–mullite composite cylinders. Infiltration processing results in a macroscopic variation of mullite concentration and residual stress throughout the samples. At the midheight of the cylinder, the stress component parallel to th…
Model reactions of the hardening of gelatin with 13 C labeled formaldehyde were monitored by 13 C NMR spectroscopy in solution and in the solid state. In solution primary attack of formaldehyde first forms methylols of lysine residues and later of arginine residues, which react to a lysine-arginine crosslink. During t…
In June 1988 Gd DTPA became the first MR contrast agent to be approved for clinical use in adult patients in the United States. Initial approval was given for its use in imaging of the head. One year later approval was extended to include spine studies. This was soon followed by approval for use in children aged 2 yea…
The electro‐oxidation reactions of substituted polysilane homopolymers dissolved in methylene chloride electrolyte were studied using cyclic voltammetry and chronocoulometry. The oxidation waves appear at potentials close to those for the corresponding waves for polymer films, but the current peak height responds line…
Abstract The inelastic reflection of fast electrons is investigated on the base of the “invariant imbedding method”. The non‐linear term in the integral equation can be neglected owing to the strong anisotropy of elastic cross‐section of fast electrons. Using the Fokker‐Planck approximation and the Laplace transformat…
Quantitative determination of phase abundance in high‐alumina refractories has been performed using the Rietveld refinement method applied to X‐ray powder diffraction data. The use of a “whole‐pattern” method for analysis has allowed the simultaneous determination of accurate unitcell parameters and the phase abundanc…
Abstract Sixty percent of the supratidal deposits of a well in the giant Yacheng Gas Field show evidence of pedogenic alteration. Pedogenic features of these Mid-Tertiary sediments include porphyroskelic and lattisepic textures, argillans, embayed quartz grains, peds, horizonation, high carbonaceous content, pedotubul…
Total serum calcium concentration was raised in a 63-year-old lady with multiple myeloma and markedly elevated serum IgA kappa-paraprotein concentration. Symptoms of hypercalcaemia were absent, and serum ionized calcium was normal, suggesting calcium binding by the abnormal protein. This was demonstrated directly afte…
AbstractThe evolution of microstructure during a single pass of laboratory hot rolling (47% reduction) of a 5083 aluminium alloy has been investigated at different positions through the thickness of the plate. The thermomechanical histories of the subsurface and centre regions of the hot rolled slab were analysed usin…
A comprehensive review of cotton maturity test methods is presented, and the relationship of maturity to dyeability is reviewed. The potential use of maturity test data for controlling commercial dyeing operations is assessed.
We have studied a Hamiltonian that models the change in effective interactions leading to a change in phonon dispersion relations that occurs at a diffusionless first-order structural phase transition. This change produces lower frequency phonons and correspondingly a higher vibrational entropy in the high-temperature…
Some analytical expressions for the calculation of the magnetic induction and the vector potential in iron-free media due to conductors in annular arc shape with regular cross section are reported. The algorithms derived, together with analogous algorithms reported previously for the calculation of the magnetic fields…
Stable and metastable phase relationships in the system ZrO 2 –ErO 1.5 were investigated using homogeneous samples prepared by rapid quenching of melts and by arc melting. The rapidly quenched samples were annealed in air for 48 h at 1690°C or for 8 months at 1315°C. Two tetragonal phases ( t ‐ and t ′‐phases) were ob…
For single-sheet testers, the field is derived either from the magnetization current or by means of a tangential field coil. The current method, proposed for IEC standardization, is characterized by simple apparatus and good reproducibility but suffers from questionable accuracy due to the lack of correspondence betwe…
ZnS-ZnxCd1−xS (x=0.56) superlattices with the same barrier (ZnS) thickness (47 Å) and varied well (ZnxCd1−xS) thicknesses (23–80 Å) were grown by molecular-beam epitaxy. Reflection high-energy electron diffraction patterns during the growth showed streaks, and superlattice structure was confirmed by the presence of sa…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis of K4M3Te17 (M = zirconium, hafnium) and the structure of potassium hafnium telluride, K4Hf3Te17, a new one-dimensional solid-state ternary polytelluridePatricia M. Keane and James A. IbersCite this: Inorg. Chem. 1991, 30, 6, 1327–1329Publication Date (Print):March…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHydrochalcogenide and hydride hydrochalcogenide derivatives of rhodiumMassimo Di Vaira, Maurizio Peruzzini, and Piero StoppioniCite this: Inorg. Chem. 1991, 30, 5, 1001–1007Publication Date (Print):March 1, 1991Publication History Published online1 May 2002Published inissue…
Abstract The solubilization of the calcium soaps of long chain fatty acids by liquid fatty acids was observed. The solubilities of calcium palmitate, calcium laurate, and calcium oleate were 15.6, 22.8, and 53.3 wt%, respectively, in oleic acid at 40°C. The formation of an acid‐calcium soap complex was demonstrated by…
Abstract Upper Jurassic claystones of Kimmeridgian-Volgian(-Ryazanian) age are the main source rocks for oil in the Central Trough, North Sea. Drill cuttings and cores from the depth interval 2368–4548 m, the interval from early-mature to peak oil generation, have been investigated by high-resolution transmission elec…