Zhengming Zhang、John H. Kennedy、Hellmut Eckert1992-07-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTGlass formation and structure in non-oxide chalcogenide systems. The short range order of silver sulfide (Ag2S)-phosphorus sulfide (P2S5) glasses studied by phosphorus-31 MAS-NMR and dipolar NMR techniquesZhengming Zhang, John H. Kennedy, and Hellmut EckertCite this: J. Am.…
Crystal Structures and PropertiesPhase-change materials and chalcogenidesMineralogy and Gemology Studies
J. S. Chen、A. F. MacKenzie1992-07-01Communications in Soil Science and Plant Analysis
Fixation of NIL4 + and K+ by soil clays affects N and K availability to plants, and fixation may be a result of N source or method of application. An incubation study with urea, NH4Cl and KCl was conducted to evaluate NH4 + and K+ fixation in three southern Quebec soils. Soils contained significant amounts of native‐f…
Soil Carbon and Nitrogen DynamicsPlant nutrient uptake and metabolismClay minerals and soil interactions
Atsushi Yoshizawa、Isa Nishiyama、Hiroshi Kikuzaki 等 4 位作者1992-07-01Japanese Journal of Applied Physics
We have investigated molecular motion and ordering in the smectic phases of a nonoriented antiferroelectric liquid crystal by means of C-13 NMR and powder X-ray diffraction. The marked line broadenings for core carbons observed by C-13 NMR indicate the existence of the characteristic molecular motion for the molecular…
Liquid Crystal Research AdvancementsSolid-state spectroscopy and crystallographyMolecular spectroscopy and chirality
A. Medína、J. Arrillaga1992-07-01IEEE Transactions on Power Delivery
The periodic nonlinear behavior of a multilimb three-phase transformer is modeled in the harmonic domain, a frame of reference which allows cross-couplings between phases and between harmonics to be explicitly represented. The magnetic equivalent circuit is derived from the individual magnetizing characteristics of th…
Matrix Theory and AlgorithmsMagnetic Properties and ApplicationsElectromagnetic Simulation and Numerical Methods
Ping Sheng、Bo‐Zang Li、Minyao Zhou 等 5 位作者1992-07-01Physical Review A
A disordered nematic surface layer, with negative orientational order or biaxial order, is shown to result from interaction with substrates which favor random planar alignment. We propose a simple interaction Hamiltonian which yields predictions in excellent agreement with measured pretransitional effects for 4-n-pent…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesSurfactants and Colloidal Systems
Shinya Teramachi、Akira Hasegawa、Tatsuya Matsumoto 等 6 位作者1992-07-01Macromolecules
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDetermination of chemical composition distribution of poly(methyl methacrylate)-graft-polystyrene by adsorption high-performance liquid chromatographyShinya Teramachi, Akira Hasegawa, Tatsuya Matsumoto, Kiyoshi Kitahara, Yasuhisa Tsukahara, and Yuya YamashitaCite this: Macro…
Advanced Polymer Synthesis and Characterizationbiodegradable polymer synthesis and propertiesAnalytical Chemistry and Chromatography
V. Paidar1992-07-01Philosophical magazine. A/Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
A systematic geometrical analysis developed for symmetrical grain boundaries is extended to tilt asymmetrical boundaries in both f.c.c. and b.c.c. lattices. The presented scheme is compatible with the structural unit model in which so-called delimiting or favoured short-period grain boundaries play a special role. It…
Microstructure and mechanical propertiesQuasicrystal Structures and PropertiesX-ray Diffraction in Crystallography
Jeff Moulton、Paul Smith1992-07-01Journal of Polymer Science Part B Polymer Physics
Abstract The mechanical and electrical properties of solution‐processed [or gel‐spun] blends of poly(3‐octylthiophene) and ultrahigh molecular weight polyethylene are discussed. Tensile drawing at elevated temperatures of the phase‐separated blends resulted in significant improvements of the mechanical properties, in…
Organic Electronics and PhotovoltaicsAdvanced Sensor and Energy Harvesting MaterialsConducting polymers and applications
J. R. Jinkins、Jennifer W. Robinson、Lisa Sisk 等 5 位作者1992-07-01PubMed
PURPOSE: To study the effects of iodinated radiographic contrast agents on proton relaxation in MR imaging. PATIENTS AND METHODS: Two patients were evaluated after the intrathecal administration of an iodinated nonionic contrast agent (Isovue) and five subjects with cranial tumors following the intravenous administrat…
Advanced MRI Techniques and ApplicationsLanthanide and Transition Metal ComplexesMRI in cancer diagnosis
Takafumi Okoshi、Henry Chen、Giorgio Soldani 等 5 位作者1992-07-01ASAIO Journal
Microporous prostheses of 1.5 mm internal diameter were fabricated with a polyvinylidene fluoride-trifluoroethylene (PVDF-TrFE)n co-polymer by the spray phase inversion technique. Some of the grafts were made piezoelectric by poling under a high electrical field. Overall, 24 poled grafts (P) and 24 unpoled grafts (UP)…
Polymer Nanocomposites and PropertiesElectrospun Nanofibers in Biomedical ApplicationsPolymer Nanocomposite Synthesis and Irradiation
Xing-Fei He、Peter Fisk、Neil B. Manson1992-07-01Journal of Applied Physics
The Autler–Townes effect in nuclear magnetic resonance (NMR) and electron paramagnetic resonance has been observed using recently developed Raman heterodyne techniques. The measurements were carried out on the nitrogen-vacancy color center in diamond, where the 3A↔3E optical transition was driven by a single mode dye…
Diamond and Carbon-based Materials ResearchLaser-Matter Interactions and ApplicationsQuantum optics and atomic interactions
Ciaran J. Brennan1992-07-01Ferroelectrics
A mathematical model for the electrical hysteresis of ferroelectric thin-film capacitors based on the Landau free energy theory is presented. The hysteresis of a single ferroelectric crystallite is derived from free energy considerations. The hysteresis of a polycrystalline material is obtained by accounting for the s…
Ferroelectric and Piezoelectric MaterialsAcoustic Wave Resonator TechnologiesMagnetic Properties and Applications
T. T. Wooster、M. Watanabe、Royce W. Murray1992-07-01The Journal of Physical Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLong-range electron transfers between very slowly diffusing tetracyanoquinodimethane and its radical anion in poly(ether) solutionsT. T. Wooster, M. Watanabe, and Royce W. MurrayCite this: J. Phys. Chem. 1992, 96, 14, 5886–5893Publication Date (Print):July 1, 1992Publication…
Organic Light-Emitting Diodes ResearchConducting polymers and applicationsLuminescence and Fluorescent Materials
J. Felts、Albany D. Grubb1992-07-01Journal of Vacuum Science & Technology A Vacuum Surfaces and Films
Large-scale application of plasma enhanced chemical vapor deposition (PECVD) and PECVD-like processes have been limited due to the inherent complexity and dependence of the reactor geometry and gas flow patterns on the process variables. Plasma diagnostics and robust experimental design have enabled large-area applica…
Surface Modification and SuperhydrophobicityMetal and Thin Film MechanicsCopper Interconnects and Reliability
F. Gouda、W. Kuczyński、S. T. Lagerwall 等 6 位作者1992-07-01Physical Review A
A method is presented allowing the determination of the three principal values (${\mathrm{\ensuremath{\varepsilon}}}_{1}$,${\mathrm{\ensuremath{\varepsilon}}}_{2}$,${\mathrm{\ensuremath{\varepsilon}}}_{3}$) of the dielectric tensor for a chiral smectic-C liquid crystal in the case that the material has an uncompensate…
Liquid Crystal Research AdvancementsPlant Reproductive BiologyMolecular spectroscopy and chirality
George Górecki1992-07-01CORROSION
The corrosion resistance of three types of iron phosphate coatings on cold-rolled steel was examined. The alkali metal phosphating baths studied were three of the types most commonly encountered in industrial finishing operations. Coating composition was varied by using different accelerators in the phosphating bath.…
Corrosion Behavior and InhibitionHigh-Temperature Coating BehaviorsConcrete Corrosion and Durability
Claudio Bianchini、Carlo Mealli、Maurizio Peruzzini 等 4 位作者1992-07-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTReversible uptake of hydrogen and nitrogen at cobalt in the solid state. Influence of the counter anion on the formation of classical dihydride vs. nonclassical .eta.2-dihydrogen forms of [(PP3)CoH2]+Claudio Bianchini, Carlo Mealli, Maurizio Peruzzini, and Fabrizio ZanobiniC…
Hydrogen Storage and MaterialsAsymmetric Hydrogenation and CatalysisAmmonia Synthesis and Nitrogen Reduction
Wolfgang Meyer、Günter Schäfer1992-07-01European Journal of Biochemistry
Plasma membranes of the thermoacidophilic archaebacterium Sulfolobus acidocaldarius (DSM 639) display a pyrophosphate-hydrolyzing activity [M. Lübben & G. Schäfer (1987) Eur. J. Biochem. 164, 533-540]. In our present work, we solubilized and purified this pyrophosphatase to homogeneity. It consists of a single subunit…
Photosynthetic Processes and MechanismsEnzyme Catalysis and ImmobilizationEnzyme Structure and Function
Mamoun M. Bader、Tomoyuki Hamada、Atsushi Kakuta1992-07-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTTheoretical investigation of the geometric structures and the second-order nonlinear optical properties of 8-hydroxyquinoline derivativesMamoun M. Bader, Tomoyuki Hamada, and Atsushi KakutaCite this: J. Am. Chem. Soc. 1992, 114, 16, 6475–6479Publication Date (Print):July 1,…
Porphyrin and Phthalocyanine ChemistryNonlinear Optical Materials ResearchMolecular spectroscopy and chirality
N.A. Pertsev、G. Arlt1992-07-01Ferroelectrics
A theory of the banded domain a-structures in tetragonal ferroelectric ceramics is presented. The mechanical sources of internal stresses appearing on the grain and band boundaries at a phase transition are modelled by arrays of wedge disclinations and continuously distributed fictitious dislocations. With the aid of…
Ferroelectric and Piezoelectric MaterialsNumerical methods in engineeringUltrasonics and Acoustic Wave Propagation