Impact ionization coefficients of electrons and holes in
The arsenic composition dependences of electron and hole ionization coefficients, α and β, in
Materials Literature
文献浏览
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。
Progress Toward Understanding the Stress Corrosion Problem
This paper describes current understanding of the propagation of transgranular stress corrosion cracking (TGSCC) in engineering alloys. In contrast to intergranular stress corrosion cracking (IGSCC), which proceeds by preferential anodic dissolution at the crack tip, TGSCC is considered to propagate by discontinuous b…
Ferrimagnetic to spin glass transition in the mixed spinel Mg1+tFe2-2tTitO4: a Mossbauer and DC susceptibility study
Mossbauer and DC susceptibility studies are reported on the mixed spinel Mg 1+t Fe 2-2t Ti t O 4 at various temperatures and in an external magnetic field. Results are obtained indicating that on increasing dilution t, the collinear ferrimagnetic phase breaks down before reaching the ferrimagnetic percolation limit as…
Ground term splitting of high-spin cobalt(2+) ion as a probe of coordination structure. 1. Dependence of the splitting on coordination geometry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGround term splitting of high-spin cobalt(2+) ion as a probe of coordination structure. 1. Dependence of the splitting on coordination geometryMarvin W. Makinen, Lawrence C. Kuo, Moon B. Yim, Gregg B. Wells, James M. Fukuyama, and Judy E. KimCite this: J. Am. Chem. Soc. 1985…
Compensatory phosphorylation of isocitrate dehydrogenase. A mechanism for adaptation to the intracellular environment.
When Escherichia coli grows on acetate, the flow of isocitrate through the glyoxylate bypass is regulated, in part, through the phosphorylation of isocitrate dehydrogenase. In addition to its role in adaptation to alternative carbon sources, this phosphorylation system responds to variation in the intracellular level…
Magnetic interactions in metal complexes of binucleating ligands. 2. Synthesis and properties of binuclear copper(II) compounds containing exogenous ligands that bridge through two atoms. Crystal and molecular structure of a binuclear .mu.-pyrazolato-N,N'-bridged dicopper(II) complex of 1,3-bis(salicylideneamino)propan-2-ol
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMagnetic interactions in metal complexes of binucleating ligands. 2. Synthesis and properties of binuclear copper(II) compounds containing exogenous ligands that bridge through two atoms. Crystal and molecular structure of a binuclear .mu.-pyrazolato-N,N'-bridged dicopper(II…
Ceramic/metal joining for structural applications
Technological advances are extending the applications for bonded ceramic-metal components and demanding more rigorous performance characteristics. The techniques available for fabricating high–integrity joints for structural applications have been reviewed and attention is drawn to the factors that effect both direct…
Organic superconductors: structural aspects and design of new materials
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTOrganic superconductors: structural aspects and design of new materialsJack M. Williams, Mark A. Beno, Hau H. Wang, Peter C. W. Leung, Thomas J. Emge, Urs Geiser, and K. Douglas CarlsonCite this: Acc. Chem. Res. 1985, 18, 9, 261–267Publication Date (Print):September 1, 1985P…
PHOTOCHEMICAL ACTIVATION OF ALUMINUM–ALKYL BOND IN ALUMINUM PORPHYRIN. CONJUGATE ADDITION REACTION WITH VINYL KETONE
Abstract Tetraphenylporphinatoaluminum ethyl undergoes addition reaction toward vinyl ketone via a novel enolate aluminum porphyrin as the intermediate. This reaction is remarkably accelerated upon irradiation with visible light retaining the reaction mode.
Effects of α‐Radiolysis on Leaching of a Nuclear Waste Glass
The effects of α‐radiolysis on leaching were studied in compositionally identical Pu‐doped waste glass samples which were prepared at different α‐activities (dose rates) by varying the 239 Pu/ 238 Pu isotopic ratio in the Pu dopant. The results of 14‐, 28‐, and 56‐d static leach tests at 40°C, in both deionized water…
New layered ternary chalcogenides: tantalum palladium sulfide (Ta2PdS6), tantalum palladium selenide (Ta2PdSe6), niobium palladium sulfide (Nb2PdS6), niobium palladium selenide (Nb2PdSe6).
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNew layered ternary chalcogenides: tantalum palladium sulfide (Ta2PdS6), tantalum palladium selenide (Ta2PdSe6), niobium palladium sulfide (Nb2PdS6), niobium palladium selenide (Nb2PdSe6).Douglas A. Keszler, Philip J. Squattrito, Nathaniel E. Brese, James A. Ibers, Maoyu Sha…
Photochemistry of aliphatic polyamides. 3. Mechanisms of photooxidation of polyamides 6, 11, and 12 at short wavelength
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhotochemistry of aliphatic polyamides. 3. Mechanisms of photooxidation of polyamides 6, 11, and 12 at short wavelengthAgnes Roger, Daniel Sallet, and Jacques LemaireCite this: Macromolecules 1985, 18, 9, 1771–1775Publication Date (Print):September 1, 1985Publication History…
Occurrence of a ferrous, trioctahedral smectite in Recent sediments of Atlantis II Deep, Red Sea
Abstract A trioctahedral, ferrous smectite has been located in the uppermost deposits of Atlantis II Deep, SW basin, Red Sea. This clay is very unstable when removed from its environment of formation and, for example, oxidizes during desiccation under laboratory conditions. Only X-ray transmission diffraction study of…
On the Problems of CD Spectropolarimeters. II: Artifacts in CD Spectrometers
The Mueller matrix approach is used to investigate the artifacts resulting from the coupling of anisotropic samples and imperfect hardwares of commercially available CD spectropolarimeters. On the basis of the results obtained, attention is called to the instrumental limitation of CD spectropolarimeters in the study o…
Synthesis and Characterization of Lansfordite and Nesquehonite
Abstract Chemically pure lansfordite (MgCO 3 ·5H 2 O) and nesquehonite (MgCO 3 ·3H 2 O) were synthesized from CO 2 ‐saturated Mg(HCO 3 ) 2 solutions by degasation with air for varying periods of time depending upon equilibration temperature. Crystalline and chemical properties of the synthesized minerals were determin…
The subunit structure and active site sequence of porcine spleen deoxyribonuclease.
An acid DNase (DNase II) from porcine spleen was purified by sequential chromatography over carboxymethyl-cellulose, blue dextran-Sepharose, hydroxylapatite, and sulfoxyethyl-cellulose. The purified enzyme shows two polypeptide bands on sodium dodecyl sulfate-polyacrylamide gel electrophoresis at Mr 35,000 (alpha chai…
Mechanism of core/shell emulsion polymerization
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMechanism of core/shell emulsion polymerizationDeborah R. Stutman, Andrew Klein, Mohamed S. El-Aasser, and John W. VanderhoffCite this: Ind. Eng. Chem. Prod. Res. Dev. 1985, 24, 3, 404–412Publication Date (Print):September 1, 1985Publication History Published online1 May 200…
Rheological and DSC changes in poly(vinyl alcohol) gels induced by immersion in water
Abstract Poly(vinyl alcohol) (PVA) gels were prepared by freezing and thawing aqueous solutions at temperatures from −20 to 15°C. The temperature was varied periodically by use of a computer. The endothermic DSC peak was observed for the PVA gels at about 60°C for five specimens of different degrees of saponification…
Examination of the necessity of complete wetting near critical points in systems with long-range forces
Cahn's general argument for complete wetting in the vicinity of critical points is critically reviewed. Critical-point wetting does occur in systems with short-range (exponentially decaying) forces. Whenever short-range forces favor wetting, while at the same time there is a tendency towards drying due to weak long-ra…
Investigation of TLD Phosphors by Optical Excitation –Luminescence of Eu2+Centers in MgSO4, CaSO4, SrSO4, BaSO4–
The photoluminescence (PL) and excitation spectra of various thermoluminescence dosimetry (TLD) phosphors were measured at temperatures of 6, 17, 80 and 300 K. Their PL spectra at 300 K consist of a single band in the vicinity of 380 nm. The emission bands and their excitation bands are ascribed to the electronic 4 f…