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。
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…
The use of contrast agents in MRI is well established as a means to improve diagnosis. MRI diflers from other imaging modalities because signal and contrast are multiparametric in both the properties of the tissue and the method of measurement. Contrast depends on differences in proton-spin density, magnetic susceptib…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCalorimetric determination of the heats of protonation of the metal in (methyl-substituted cyclopentadienyl)iridium complexes, Cp'Ir(1,5-COD)John R. Sowa Jr. and Robert J. AngeliciCite this: J. Am. Chem. Soc. 1991, 113, 7, 2537–2544Publication Date (Print):March 1, 1991Publi…
Thin films of LiyV2O5 (0<y<1) were made by reactive dc magnetron sputtering of V followed by electrochemical treatment in LiClO4. X-ray diffractometry showed an orthorhombic structure that varied from nanocrystalline (n-X ) for unheated substrates to polycrystalline (p-X ) for substrates at 180 °C. Optic…
This paper focuses on the résponse of bubbles to sudden changes in the ambient pressure. Trains of bubbles with radii varying between 45 and 200 μm were exposed to various pressure steps, and their response was monitored by pulsed laser holography. The experiments were performed in a specially constructed chamber, all…
Abstract— Monomer and dimer absorption and emission spectra, and dimerization constants are reported for the diamide of the zinc‐tetracarboxyphthalocyanine in pure dimethylformamide (DMF) and in H 2 O/DMF mixtures at room temperature. The dimerization constant increases steadily with the water content. The monomer abs…
Vickers hardness measurements have been made at room temperature for four thermodynamically stable quasicrystals. The hardness value of Al-Li-Cu icosahedral quasicrystal is about 500 (kg/mm 2 ) and those of Al-transition metal quasicrystals are commonly around 1000, which is extremely high for aluminum based alloys. A…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPorphyrin sponges. Inversion disorder and inversion twinning in lattice clathrates based on five-coordinate metallotetraarylporphyrin complexesMarianne P. Byrn and Charles E. StrouseCite this: J. Am. Chem. Soc. 1991, 113, 7, 2501–2508Publication Date (Print):March 1, 1991Pub…
Klebsiella pneumoniae catabolizes both 4-hydroxyphenylacetic acid and 3-hydroxyphenylacetic acid via meta-cleavage of 3,4-dihydroxyphenylacetic acid, ultimately yielding pyruvate and succinate. The organism can synthesize two hydroxylases catalysing 3,4-dihydroxyphenylacetic acid formation, which differ in substrate s…
Abstract Cationic ring‐opening polymerization of e‐caprolactone using triethyloxonium hexafluorophosphate initiator in the presence of alcohol to produce low molecular weight polyester glycol was examined. The polymerization proceeded by an activated monomer mechanism; thus the polymer molecular weight increased direc…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTComplexation, luminescence, and energy transfer of cerium(3+) with a series of multidentate aminophosphonic acids in aqueous solutionSteven T. Frey and William D. Horrocks Jr.Cite this: Inorg. Chem. 1991, 30, 5, 1073–1079Publication Date (Print):March 1, 1991Publication Hist…
Abstract A review of relevant microscopic processes, both chemical and physical, which occur during suspension, bulk and emulsion polymerization (both before and after pressure drop) is given. The state of the art of kinetic modelling of monomer consumption rate, reactor pressure, molecular weight and short and long c…