Aravinda M. Kini、U. Geiser、Hau H. Wang 等 9 位作者1990-07-01OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA new ambient-pressure organic superconductor, .kappa.-(ET)2Cu[N(CN)2]Br, with the highest transition temperature yet observed (inductive onset Tc = 11.6 K, resistive onset = 12.5 K)Aravinda M. Kini, Urs Geiser, Hau H. Wang, K. Douglas Carlson, Jack M. Williams, W. K. Kwok,…
Magnetism in coordination complexesOrganic and Molecular Conductors ResearchInorganic Chemistry and Materials
Zhongxiang Zhou、Robert G. Parr1990-07-01OpenAlex
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTActivation hardness: new index for describing the orientation of electrophilic aromatic substitutionZhongxiang Zhou and Robert G. ParrCite this: J. Am. Chem. Soc. 1990, 112, 15, 5720–5724Publication Date (Print):July 1, 1990Publication History Published online1 May 2002Publi…
Thermal and Kinetic Analysis
Tapan K. Gupta1990-07-01OpenAlex
This paper deals with the application of ZnO varistors—an area which has not been treated in a systematic way in the literature. The paper starts with a brief description of the fundamental properties comprising the electrical behavior as well as the physics, chemistry, and microstructure of the varistor. These proper…
Thin-Film Transistor TechnologiesMagnetic Properties and ApplicationsPower Transformer Diagnostics and Insulation
M. A. Noginov、G. K. Sarkisyan、Valerii A Smirnov 等 5 位作者1990-06-30Soviet Journal of Quantum Electronics
Experimental observation of the nonadditivity of various mechanisms of population inversion of the 4I11/2→4I13/2 transition of the Er3+ ion in a YSGG:Cr3+:Er3+ crystal, M A Noginov, G K Sarkisyan, Valerii A Smirnov, A F Umyskov, Ivan A Shcherbakov
Luminescence Properties of Advanced MaterialsPhotorefractive and Nonlinear OpticsSolid State Laser Technologies
Jacqueline I. Kroschwitz1990-06-29Medical Entomology and Zoology
A compact desk reference, this book includes all the subjects contained in the 17 alphabetical volumes and the Supplement and Index volumes of the Encyclopedia of Polymer Science and Engineering. The articles have been condensed by professional science writers, reviewed for accuracy by the original authors or their co…
Material Properties and ApplicationsPolymer Science and PVCPolymer Science and Applications
James E. Humphreys1990-06-29OpenAlex
This graduate textbook presents a concrete and up-to-date introduction to the theory of Coxeter groups. The book is self-contained, making it suitable either for courses and seminars or for self-study. The first part is devoted to establishing concrete examples. Finite reflection groups acting on Euclidean spaces are…
Graph theory and applicationsAdvanced Algebra and GeometryNanocluster Synthesis and Applications
P.V. Sivaprasad、K. Ramesh、Y.P. Reddy1990-06-25Journal of Physics Condensed Matter
The optical absorption and electron spin resonance spectra of vanadyl-and copper-doped rubidium cadmium sulphate hexahydrate are investigated at room and liquid nitrogen temperatures. From the analysis, the spectra are ascribed C 4v site symmetry in the case of VO 2+ ions and D 2h site symmetry in the case of Cu 2+ io…
Crystal structures of chemical compoundsLanthanide and Transition Metal ComplexesSolid-state spectroscopy and crystallography
I. Fehst、R. Böhmer、Walter Ott 等 6 位作者1990-06-25Physical Review Letters
Solid solutions of (KI${)}_{1\mathrm{\ensuremath{-}}\mathit{x}}$(${\mathrm{NH}}_{4}$I${)}_{\mathit{x}}$ with concentrations x=0.14, 0.43, and 1 were investigated using dielectric spectroscopy. The high-temperature rocksalt structure of these compounds exhibits a dipole moment of 1.4 D. For x=0.14 and 0.43 the NaCl str…
Material Dynamics and PropertiesGlass properties and applicationsSolid-state spectroscopy and crystallography
H. Brändle、J. Schoenes、P. Wächter 等 5 位作者1990-06-25Applied Physics Letters
The magneto-optical polar Kerr effect has been measured on CuCr2Se4 single crystals between 0.55 and 5.0 eV. The single Kerr ellipticity εK reaches −1.19° at 0.96 eV which is (besides PtMnSb with θK=−1.27° at 1.72 eV) the highest value ever observed at room temperature. The figure of merit R1/2(θ2K + ε2K)1/2 has a max…
Chalcogenide Semiconductor Thin FilmsMagnetic and transport properties of perovskites and related materialsAdvanced Condensed Matter Physics
Mark Harris、Ekhard K. H. Salje、B. Güttler1990-06-25Journal of Physics Condensed Matter
The temperature dependence of the infrared-active internal modes of NaNO 3 has been investigated between 77 K and 700 K. The structural phase transition at 549 K is observed through the appearance of additional peaks subsidiary to the expected nitrate group internal modes. In particular, an extra peak is observed at s…
Crystallography and molecular interactionsSpectroscopy and Quantum Chemical StudiesSolid-state spectroscopy and crystallography
Serge Cattarinussi、Giancarlo Jug1990-06-21Journal of Physics A Mathematical and General
The authors present novel real-space renormalization results for a lattice model of the collapse (coil-globule) transition of a polymer molecule adsorbing to a wall. These results support the conjecture that adsorption stabilises the collapsed phase by enhancing the collapse transition temperature. The analysis is dev…
Material Dynamics and PropertiesTheoretical and Computational PhysicsRheology and Fluid Dynamics Studies
Junko Habasaki1990-06-20Molecular Physics
A molecular-dynamics simulation is carried out to study the changes in statistical geometry and related dynamical properties in the Li2SiO3 system at the glass transition point. The number of oxygens around each cation within the first coordination shell is taken as the number V of vertices of the polyhedron that char…
Material Dynamics and PropertiesGlass properties and applicationsPhase-change materials and chalcogenides
Charles R. Lovell、Alan Przybyla、Lars G. Ljungdahl1990-06-19Biochemistry
The complete nucleotide sequence of the Clostridium thermoaceticum formyltetrahydrofolate synthetase (FTHFS) was determined and the primary structure of the protein predicted. The gene was 1680 nucleotides long, encoding a protein of 559 amino acid residues with a calculated subunit molecular weight of 59,983. The ini…
Protein Structure and DynamicsFolate and B Vitamins ResearchEnzyme Structure and Function
Yasusada Nambu、Yukio Morishige、S. Kishida1990-06-18Applied Physics Letters
High-speed laser direct writing of tungsten conductors using tungsten-hexacarbonyl [W(CO)6] is demonstrated. Tungsten lines were constructed on the Si-LSI substrate at a writing speed as high as 300 μm/s with laser-induced low-pressure chemical vapor deposition. This speed is more than two orders of magnitude higher t…
Diamond and Carbon-based Materials ResearchElectronic and Structural Properties of OxidesAdvanced Materials Characterization Techniques
Xiaohu Qian、H. Z. Cummins1990-06-18Physical Review Letters
The response of a growing crystalline dendrite to a brief localized heat pulse applied near its tip was investigated in a directional solidification experiment on succinonitrile containing 1% acetone. The induced deformation was initially unobservably small, but grew rapidly into a sidebranchlike feature with time. Th…
Theoretical and Computational PhysicsSolidification and crystal growth phenomenaCrystallization and Solubility Studies
J Ruher、N. Colaneri、Donal D. C. Bradley 等 5 位作者1990-06-18Journal of Physics Condensed Matter
The authors present a comparative study of the properties of two solution-processible alkyl-substituted polythienylenes, poly(3-hexyl thienylene), P3HT and poly(3-dodecyl thienylene), P3DT. Both show the onset of pi - pi * interband absorption at 2 eV with the peak in absorption coefficient near 2.5 eV, and both show…
Organic Electronics and PhotovoltaicsConducting polymers and applicationsAnalytical Chemistry and Sensors
A. Ghosh、D. Chakravorty1990-06-18Journal of Physics Condensed Matter
The first measurements are reported for the AC conductivity (real and imaginary parts) of the semiconducting CuO-Bi 2 O 3 -P 2 O 5 glasses in the frequency range 10 2 -10 5 Hz and in the temperature range 80-4000 K. The experimental results have been analysed in the light of various theoretical models proposed for amo…
Material Dynamics and PropertiesGlass properties and applicationsPhase-change materials and chalcogenides
B. Pałosz1990-06-18Journal of Physics Condensed Matter
The structures of 2H PbI 2 , grown from a gel, and of 4H PbI 2 , obtained by thermal transformation of 2H at 423 K, have been determined by single-crystal X-ray analysis. The space groups are P3m1 for 2H and P3m1 for 4H. The occupancy of the atomic sites in the 2H and 4H structures is only about 80-85%, indicated by a…
Advanced Thermoelectric Materials and DevicesAdvanced Semiconductor Detectors and MaterialsSolid-state spectroscopy and crystallography
J. Llopis1990-06-16physica status solidi (a)
Photoluminescence and cathodoluminescence are studied in MgO and CaO stabilized ZrO2 crystals before and after mechanical damage by grinding and Vickers indentations. Significative differences in the emission and excitation spectra are found between crystals stabilized by MgO and CaO. Mechanical damage in cubic stabil…
Luminescence Properties of Advanced MaterialsAdvanced ceramic materials synthesisSilicone and Siloxane Chemistry
A.S. Taha、F.H. Hammad1990-06-16physica status solidi (a)
The hardness of materials, H, is dependent on grain diameter, d, in a similar way as the flow stress in the Hall-Petch relation: H = Ho + KHd−1/2, where, Ho and KH are constants. The microhardness of 2S-Al (99.5% Al), pure Cu, Al-MD 105 (Al-1% Al2O3), and Duralumin (Al-3.94% Cu) is found to vary with grain size accord…
Microstructure and mechanical propertiesMetal and Thin Film MechanicsAluminum Alloys Composites Properties