Hans Toftlund、Sine Larsen、Keith S. Murray1991-10-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSynthesis and spectroscopic and magnetic properties of a unique diamagnetic binuclear .mu.-oxo vanadium(IV) complex. Crystal structure of [(tpa)VO(.mu.-O)VO(tpa)](ClO4)2 (tpa = tris(2-pyridylmethyl)amine)Hans Toftlund, Sine Larsen, and Keith S. MurrayCite this: Inorg. Chem.…
Magnetism in coordination complexesMetal-Catalyzed Oxygenation MechanismsVanadium and Halogenation Chemistry
R. Schenk、Heike Gregorius、Kläus Müllen1991-10-01Advanced Materials
Communication: The effective conjugation length of poly(phenylenevinylene) an important conducting polymer, can be estimated by extrapolation of the results of UV/VIS/NIR studies of the radical anions and dianions of the soluble, well‐characterized oligo(phenylenevinylene)s shown in the figure. This information, in tu…
Advanced Sensor and Energy Harvesting MaterialsConducting polymers and applicationsAnalytical Chemistry and Sensors
David Govezensky、Tsvika Greener、Gil Segal 等 4 位作者1991-10-01Journal of Bacteriology
Several approaches were used to study the role of GroEL, the prototype chaperonin, in the nitrogen fixation (nif) system. An Escherichia coli groEL mutant transformed with the Klebsiella pneumoniae nif gene cluster accumulated very low to nondetectable levels of nitrogenase components compared with the isogenic wild-t…
Bacterial Genetics and BiotechnologyEnzyme Structure and FunctionMetalloenzymes and iron-sulfur proteins
Dong X. Li、William Thomson1991-10-01Journal of the American Ceramic Society
Diphasic gels with Al/Si atomic ratios of 6/1, 3.1/1, 3/1, 2/1, and 1/1 were used to study the effect of precursor composition on mullite formation process and the resulting microstructure. Mullite formation initiated at about 1300°C for all samples, with only some slight differences in temperatures. The mullite forma…
Advanced ceramic materials synthesisAluminum Alloys Composites PropertiesIntermetallics and Advanced Alloy Properties
Jean‐Louis Barrat、Michael L. Klein1991-10-01Annual Review of Physical Chemistry
Machine learning (ML) is transforming all areas of science. The complex and time-consuming calculations in molecular simulations are particularly suitable for an ML revolution and have already been profoundly affected by the application of existing ML ...Read More
Material Dynamics and Properties
Markus Wollgarten、D. Gratias、Z. Zhang 等 4 位作者1991-10-01Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
The contrast of dislocations in icosahedral quasicrystals observed by transmission electron microscopy is discussed in the framework of the kinematical theory of electron diffraction. It is found that, owing to the special structural features of dislocations in quasiperiodic lattices, there are two basically different…
Quasicrystal Structures and PropertiesX-ray Diffraction in CrystallographyMineralogy and Gemology Studies
Wei‐Ying Sun、T. Y. Tien、T.S. Yen1991-10-01Journal of the American Ceramic Society
The solubility limit of α'‐SiAION solid solutions on the Si 3 N 4 ─YN:3AIN composition join in the system Si 3 N 4 ─YN─AIN has been determined at 1800°C. The end members of these solid solutions are Y 0.43 Si 10.7 Al 1.3 N 16 and Y 0.8 Si 9.6 Al 2.4 N 16 . Unit‐cell dimensions of the α'‐SiAION solid solutions in the s…
Ferroelectric and Piezoelectric MaterialsAdvanced ceramic materials synthesisMicrowave Dielectric Ceramics Synthesis
W. H. Qiao、Q. Wang、X.P. Zhong 等 4 位作者1991-10-01physica status solidi (b)
Abstract On the basis of a two‐sublattice model, the temperature dependent magnetic properties of the intermetallic compounds R 2 Fe 17 C (R = Ce, Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, Lu) are analyzed using the molecular‐field theory. The results of the analysis show that the molecular‐field coefficients n RF are rather se…
Magnetic properties of thin filmsRare-earth and actinide compoundsMagnetic Properties of Alloys
Ghulam Hussain、Gwilym J. Rees1991-10-01Propellants Explosives Pyrotechnics
Abstract A hot‐stage unit, operating over the temperature range from ambient to 1000°C has been used to study the combustion of black powder. Direct observation of heating of mixtures was supplemented by 35‐mm photomicrography. Results are presented for black powder supplied and mixture prepared in the laboratory.
Combustion and flame dynamicsEnergetic Materials and CombustionThermal and Kinetic Analysis
D. Rama Rao、V. B. Gupta1991-10-01Textile Research Journal
We have compared the mechanical properties of wool fibers from three different breeds of sheep, Lincoln, Chokla, and Merino. The tensile moduli are highest for Lincoln, followed by Chokla and Merino fibers, but there is a reverse trend in the torsional modulus. The differences in mechanical properties are explained in…
Dyeing and Modifying Textile FibersTextile materials and evaluations
K. Knop1991-10-01Physikalische Blätter
Abstract Die Optik gehört zu den ältesten Teilgebieten der Physik und hat zu deren Entwicklung immer wieder entscheidend beigetragen. In der ersten Hälfte dieses Jahrhunderts wurde die Optik durch die aufregenden Entwicklungen in der Quantenmechanik und Elementarteilchenphysik etwas in den Hintergrund (und aus vielen…
Photonic and Optical DevicesPhotonic Crystals and ApplicationsOptical Coatings and Gratings
S. C. Tjong1991-10-01X-Ray Spectrometry
Abstract The use of Fe–Mn–Al–C alloys in oxidizing–sulphidizing environments at elevated temperatures is considered. Applications of SEM, EDX mapping and x‐ray diffraction techniques to the microstructural characterization of the scale development on these alloys are reviewed. Combination of the electron microscope an…
Corrosion Behavior and InhibitionMetal and Thin Film MechanicsMetal Alloys Wear and Properties
D. Liu、Hsiao‐Ming Lu、J. R. Hardy 等 4 位作者1991-10-01Physical review. B, Condensed matter
Raman-scattering measurements on single crystals of ${\mathrm{K}}_{2}$${\mathrm{SO}}_{4}$, ${\mathrm{Rb}}_{2}$${\mathrm{SO}}_{4}$, and ${\mathrm{Cs}}_{2}$${\mathrm{SO}}_{4}$ have been made at both room and liquid-nitrogen temperatures. Lattice-dynamical calculations, based on a rigid-ion model using the Gordon-Kim met…
Glass properties and applicationsSpectroscopy and Quantum Chemical StudiesSolid-state spectroscopy and crystallography
Douglas M. Pease1991-10-01Physical review. B, Condensed matter
Transition-metal x-ray-emission spectra, corresponding to transitions between the 3s level and the ${\mathit{L}}_{3,2}$ core holes, are studied. The spectra are synthesized from a superposition of two Lorentzian functions, where the relative weighting of the Lorentzians is calculated based on the assumptions of variou…
X-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy TechniquesSurface and Thin Film Phenomena
Katsufumi Tanaka、Haruhiko Naruse、H. Morikawa 等 4 位作者1991-10-01Acta Crystallographica Section B Structural Science
The crystal structure of Na2SO4(III) (space group Cmcm) and thermal motions of atoms were investigated at 298, 463 and 505 K. The cell parameters are a = 5.6274 (4), b = 8.9664 (11) and c = 6.9737 (9)/~, at 298 K. The R and wR values were 0.0197 and 0.0202 for 984 reflections at 298 K, 0.0201 and 0.0199 for 640 reflec…
Solid-state spectroscopy and crystallographyChemical and Physical Properties in Aqueous SolutionsThermal and Kinetic Analysis
T.J. Tate、M.F. Garcia Parajo、Mino Green1991-10-01Journal of Applied Physics
Ion implantation is a possible technique to introduce electrochromically active dopants into fine-grained WO3 thin films. However, to be of use, we must be able to distinguish, and erase, effects due to collisional damage. Argon implants were performed in order to investigate damage effects. Pure damage was found to c…
Gas Sensing Nanomaterials and SensorsAdvanced Memory and Neural ComputingTransition Metal Oxide Nanomaterials
Shinichi Sakurai、Shigeru Okamoto、Tomoaki Kawamura 等 4 位作者1991-10-01Journal of Applied Crystallography
Lamellar microdomains formed in the solvent-cast films of a poly[styrene-block-(ethylene-alt-propylene)] (SEP) diblock polymer were studied by small-angle X-ray scattering (SAXS). The SAXS profiles, displaying a series of peculiar scattering maxima which cannot be ascribed to the higher-order diffraction maxima from a…
Polymer crystallization and propertiesBlock Copolymer Self-AssemblyCopper Interconnects and Reliability
Li Chen、J. D. Brock、Jen‐Yu Huang 等 4 位作者1991-10-01Physical Review Letters
High-resolution x-ray scattering experiments to study the critical smectic-A fluctuations in the nematic phase have been performed on a mixture of two nonpolar, two-benzene-ring compounds. The ratio ${\mathit{T}}_{\mathit{N}\mathit{A}}$/${\mathit{T}}_{\mathit{N}\mathit{I}}$ (=0.885) for this mixture is much smaller th…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsNonlinear Dynamics and Pattern Formation
Vittorio Luca1991-10-01Clays and Clay Minerals
Abstract Mössbauer spectra were obtained for five Ca-exchanged nontronites and one Ca-exchanged vermiculite as the 2-layer hydrates following dehydration at 200°C. Exchange of the samples with Ca 2+ and subsequent dehydration resulted in the appearance of a shoulder at about −0.50 mm/s in the Mössbauer spectra of some…
Soil and Unsaturated FlowClay minerals and soil interactionsIron oxide chemistry and applications
Barry Cooper、Stan Roth1991-10-01Platinum Metals Review
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Catalytic Processes in Materials ScienceCatalysts for Methane ReformingCatalysis and Hydrodesulfurization Studies