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。
Some day hydrogen may be used as a viable energy storage and transport medium within the United States. Hydrogen gas may be used to dilute and extend our present methane supply as a blend or may even be used in its pure elemental form as a primary fuel. Independent of the methods of production, storage, and distributi…
Abstract The dehydrogenation of cyclohexane to benzene on a platinum‐rhenium/aluminium oxide (Pt‐Re/Al 2 O 3 ) catalyst was investigated using both pulse and continuous flow techniques with hydrogen and inert (N 2 , He, Ar) diluents at the following conditions: 1 and 4 atm (1 atm = 101 kPa) total pressure and 432–623…
Chemical shifts, ΔE, of the K-absorption discontinuity in several compounds of copper possessing formal oxidation states between 0 and III have been measured. The shifts show a parabolic dependence on the formal oxidation state as well as on the effective atomic charge, q, on copper. Anomalous chemical shifts shown by…
Al substituted barium ferrite particles BaFe12-xAlxO19 with 0? x ?0.8 have been prepared by ball milling method. X-ray diffraction (XRD) has shown that the average crystallite size for all samples under investigation is in the range 66 76 nm.
The measured (apparent) specific activities of immobilized lactate dehydrogenase, malate dehydrogenase, glucose dehydrogenase, alkaline phosphatase and chymotrypsin decrease with increasing activity loading and increase with decreasing particle diameter and with increasing substrate concentration. The observed inactiv…
Abstract The structure of monoclinic Se 2 O 5 , S. G. P2 1 /c, Z = 4, was solved by direct methods and refined by an anisotropic full matrix least‐squares to R = 0.116 for 855 densitometer intensities. The structure consists of zig‐zag chaines [Se(O)OSe(O) 2 O] n with alternating Se(IV) and Se(VI) atoms. Each Se…
The removal of methyl iodide by absorption onto silver mordenite was studied using a simulated off-gas from the fuel dissolution step of a nuclear fuel reprocessing plant. The methyl iodide absorption of silver mordenite was examined for the effects of NO/sub x/, humidity, iodine concentration, filter temperature, and…
Lines emitted from levels of the 3s(2)3p(4)4s configuration to the ground levels 3s(2)3p(5) of Fe X are observed in both solar and laboratory plasma. Their relative intensities are five to six times stronger than those calculated assuming that the coronal equation is valid. Additional population processes - cascades f…
Abstract Chalcophyllite, Cu 9 Al(AsO 4 ) 2 (SO 4 ) 1.5 (OH) l2 · 18 H 2 O, crystallizes in space group R [unk] with a hex = 10.756 and c hex = 28.678Å. The structure was determined by Patterson and Fourier methods and refined by the least-squares technique to a final R index of 0.056. The dominant structural feature i…
The hydrogen profiles of silicon-nitride films were measured using the p-p scattering technique with 1.2-MeV protons generated by a small accelerator. In plasma-nitride layers, hydrogen concentrations on the order of 20 at.% were found compared to 7 at.% in low-pressure CVD layers. The depth resolution was found to be…
By using a split Hopkinson bar type apparatus, impact bending tests of 0.45% carbon steel were carried out on U-notched annealed specimens and quenched-and-tempered ones. The load-deflection curves were determine easily by the tests. The temperature dependences of the yield load, the maximum load, the fracture load an…
The authors examined antiexudative activity of bioflavonoids naringin and rutin in comparative aspect in two models of acute inflammation. The experiments were carried out on 180 male white rats and 24 guinea pigs. The two flavonoids manifested marked antiexudative effect in rats with experiments peritonitis, induced…
Enthalpies of solution have been measured for lanthanide tribromides (MBr3; M = La, Pr, Nd, Sm, Gd, Dy, or Er) in 1.0, 10–1, and 10–3 mol dm–3 hydrochloric acid. Combination of the resulting values with auxiliary thermodynamic data yields the following standard enthalpies of formation (in kJ mol–1)at 298.15 ± 0.05 K:…
Abstract Two forms of aluminum hydroxide, Al(OH) 3 , are well known as the minerals gibbsite and bayerite. Although bayerite is readily prepared synthetically, it is rarely found in nature. Using conventional X‐ray powder‐diffraction techniques we have identified two samples of Al(OH) 3 as gibbsite and bayerite and ha…
We have measured the Raman spectra of InI, InI2 and InI3 in both the high-temperature solid and the melt. Each of these materials, except for InI3, undergoes a polymorphic transition at high temperatures that can be detected by recording the Raman spectra as a function of temperature, as well as by scanning calorimetr…
An orbital diagram constructed for N4M–X–MN4 where N4 is a model for a porphyrin ring, M a transition metal, and X a monatomic bridge (O, N, or C) accounts for the electronic structure and bending preferences of the X = O and N species and predicts a closed shell for the carbido bridged complex.
The B and Q electronically excited states maintain a roughly constant energy separation in a wide range of porphyrins and porphyrin dications. An empirical scale, based upon this observation, has been used to discuss the magnitude of the substituent effects in various cases. The results lead to an alternative explanat…
The mechanical properties and dimensions of wood vary as moisture content varies, so moisture content affects wood machining processes and products. Wood machining problems associated with moisture content generally result in machining defects of the wood surface or tool wear. Chip type and machining defects are descr…
The molecular structure of the title compound has been determined by gas-phase electron diffraction, the vapour composition being obtained by quadrupole mass spectrometry. The experimental data can best be approximated by a model with a puckered four-membered ring (C2v symmetry). This deviation from D2h symmetry may b…
Transmission electron diffraction techniques coupled with quantitative x-ray energy dispersive spectroscopy have been used to characterize the phases which develop in austenitic stainless steels during exposure to thermal and to irradiation environments. In AISI 316 and Ti-modified stainless steels some thirteen phase…