Tatsuo Inoue、Yoshihiro Kumagai、Masa‐aki Kakimoto 等 5 位作者1997-04-01Macromolecules
Two aliphatic series of polyimides having well-defined structures with inherent viscosities of 0.4−2.7 dL g -1 were readily synthesized by the solid-state thermal polycondensation under high pressure of the salt monomers composed of aliphatic diamines having 6−12 methylene units and both pyromellitic acid (PMA) and bi…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersTribology and Wear Analysis
J. A. Beavers、N.G. Thompson1997-04-01OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information)
The relationship between coatings, cathodic protection (CP), and external corrosion of underground pipelines is described. Historically, this problem has been addressed by focusing on the corrosion and CP processes associated with holidays, e.g., coating disbondment and CP current flow within the disbonded region. The…
Corrosion Behavior and InhibitionConcrete Corrosion and DurabilityStructural Integrity and Reliability Analysis
Sujin Bao、Dianlin Xie、Jiping Zhang 等 5 位作者1997-04-01Proceedings of the National Academy of Sciences
The crystal structure of desheptapeptide (B24-B30) insulin (DHPI), a virtually inactive analog of insulin, was determined at 1.6 A resolution. In the refined structure model, DHPI retains three alpha-helices (A1-A8, A12-A18, and B9-B19) as its structural framework, while great conformational changes occur in the N and…
Protein Structure and DynamicsChemical Synthesis and AnalysisEnzyme Structure and Function
Hidefumi Yoshida、Yoshio Koike1997-04-01Japanese Journal of Applied Physics
Inclined homeotropic alignment was realized by irradiation of unpolarized ultraviolet light on a polyimide film that originally exhibited homeotropic alignment. Unpolarized UV light was irradiated from an oblique direction (45-degree inclined angle) once. The liquid crystal cell with a pair of inclined homeotropic ali…
Liquid Crystal Research AdvancementsPhotonic Crystals and ApplicationsPhotochromic and Fluorescence Chemistry
K. M. Bulanin、J.C. Lavalley、А. А. Цыганенко1997-04-01The Journal of Physical Chemistry B
Ozone adsorption on CaO pretreated at different temperatures was studied by FTIR spectroscopy at 77−300 K. Besides physisorption effects, a weak complex was observed formed by ozone molecules with the OH surface groups, which have pronounced basic properties, as shown by a downward shift of the ν OH band by about 21 c…
Catalytic Processes in Materials ScienceGas Sensing Nanomaterials and SensorsCatalysis and Oxidation Reactions
Louis J. Tranchitella、Bai‐Hao Chen、James C. Fettinger 等 4 位作者1997-04-01Journal of Solid State Chemistry
Compounds in the Sr1−xBaxZrSe3series, where 0≤x≤0.68, were prepared from SrSe, BaSe, Zr, and Se in evacuated and sealed silica ampules, at temperatures between 900 and 950°C. An amorphous Zr–Se phase is competitively formed in the reaction thus synthesis mixtures require 20 and 40% mole excess of Zr and Se, respective…
Crystal Structures and PropertiesIron-based superconductors researchInorganic Chemistry and Materials
Senri Ojima、Kazuki Kubo、Masayuki Kato 等 5 位作者1997-04-01Journal of The Electrochemical Society
Conditions to remove contaminations adsorbed on a surface in wet cleaning processes have to be perfectly controlled. Megasonic excitation of ozonized water removes hydrocarbon contamination from silicon surfaces. When ozonized water was excited by megasonics at a frequency of about 1 MHz, OH radicals were produced in…
Carbon Nanotubes in CompositesMicrofluidic and Capillary Electrophoresis ApplicationsElectrohydrodynamics and Fluid Dynamics
Hiroaki Isago、Dmitri S. Terekhov、Clifford C. Leznoff1997-04-01Journal of Porphyrins and Phthalocyanines
By a mixed condensation of 1,3-bis(3″,4″-dicyanophenoxy)-2-ethyl-2-methylpropane with a large amount of 4,5-bis(3,3-dimethyl-1-butynyl)phthalonitrile, 1,3-bis-2″-(9″,10″,16″,17″,23″,24″-hexakis(3″,3″-dimethyl-1″-butynyl)phthalocyaninoxyl)-2-ethyl-2-methylpropane, was synthesized as a binuclear phthalocyanine having a…
Supramolecular Chemistry and ComplexesPorphyrin and Phthalocyanine ChemistryOxidative Organic Chemistry Reactions
Achim Müller、L. Dloczik、E. Diemann 等 4 位作者1997-04-01Inorganica Chimica Acta
Mangano(II)undecatungstosilicate [(H2O)MnSiW11O39]6− was studied by cyclic voltammetry in aqueous solution at various pH values. The pH-dependent wave patterns are influenced by additional processes and were further investigated by variation of scan rates, substance concentration and buffer concentration, focussing on…
Polyoxometalates: Synthesis and ApplicationsVanadium and Halogenation ChemistryAdvanced Nanomaterials in Catalysis
Richard W. Schmude、Karl A. Gingerich1997-04-01The Journal of Physical Chemistry A
The Knudsen effusion mass spectrometric method has been used to measure the equilibrium partial pressures of SiC 2, Si 2 C, Si 2 C 2, and Si 3 C above the SiC−graphite system at temperatures between 1750 and 2000 K. New thermal functions have been calculated for these molecules from recent literature experimental and…
Advanced ceramic materials synthesisDiamond and Carbon-based Materials ResearchBoron and Carbon Nanomaterials Research
Masahito Oh‐e、Makoto Yoneya、Masuyuki Ohta 等 4 位作者1997-04-01Liquid Crystals
Viewing angle characteristics were systematically obtained when using in-plane switching (IPS) of liquid crystals. Although the IPS mode originally shows stable electro-optical performance regardless of viewing directions, the viewing angle characteristics are found to be strongly dependent on pretilt angle (slant ang…
Photonic and Optical DevicesLiquid Crystal Research AdvancementsNonlinear Dynamics and Pattern Formation
Iris Inbar、R. E. Cohen1997-04-01Ferroelectrics
The origin of the ferroelectric materials LiNbO3 and LiTaO3 was studied using extensive LAPW calculations. The coupled displacements of the oxygens and lithiums give a deep double well whereas oxygen alone displacements result in a shallower double well as a result of the oxygen-lithium overlap. Density of states calc…
Ferroelectric and Piezoelectric MaterialsPhotorefractive and Nonlinear OpticsSolid-state spectroscopy and crystallography
Anbanandam Parthiban、Anne Le Guen、Yin Yan-sheng 等 6 位作者1997-04-01Macromolecules
Amino-functionalized poly(arylene ether ketone)s have been synthesized by nucleophilic aromatic substitution from isomeric amino-functionalized monomers and Bisphenol A. The polymerizations have been found to proceed without any side reactions. The polymers were characterized by IR, 1 H NMR, and 13 C NMR spectroscopy…
Synthesis and characterization of novel inorganic/organometallic compoundsSynthetic Organic Chemistry MethodsSynthesis and properties of polymers
N. Bestaoui、Éric Prouzet1997-04-01Chemistry of Materials
Pure iridium oxide has been synthesized through a chimie douce process. This synthesis proceeds by a slow basic hydrolysis of hydrated iridium(III) chloride, at room temperature. A highly disordered oxihydroxide IrO 1.45 (OH) 1.10 ·1.5H 2 O is first obtained. It has been characterized by thermal analysis, particle-ind…
Advanced Condensed Matter PhysicsNuclear materials and radiation effectsX-ray Diffraction in Crystallography
Douglas L. Schulz、Martin Pehnt、Doug Rose 等 10 位作者1997-04-01Chemistry of Materials
The formation of CdTe thin films by spray deposition using nanoparticle colloids has been investigated. Employing a metathesis approach, cadmium iodide is reacted with sodium telluride in methanol solvent, resulting in the formation of soluble NaI and insoluble CdTe nanoparticles. After appropriate chemical workup, me…
Perovskite Materials and ApplicationsQuantum Dots Synthesis And PropertiesChalcogenide Semiconductor Thin Films
E Weinan、Peter Palffy‐Muhoray1997-04-01Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We consider phase separation in multicomponent systems in the limit as the free volume goes to zero. Excluded volume effects are taken into account via a pressure field which implicitly relates currents and forces. The pressure, obtainable from a divergence condition, may give rise to circulating currents. A simple de…
Material Dynamics and PropertiesAdvanced Thermodynamics and Statistical Mechanicsnanoparticles nucleation surface interactions
Shu Yoshida、Allan S. Hay1997-04-01Macromolecules
High molecular weight poly(phthalazinone)s with high glass transition temperatures were prepared by a novel N−C coupling reaction. New bis(phthalazinone) monomers ( 5a − f ), such as 7,7‘-oxobis[4-phenylphthalazin-1(2 H )-one] ( 5c ), were synthesized from the corresponding bis(phthalic anhydride)s ( 3a − f ) in two s…
Multicomponent Synthesis of HeterocyclesEpoxy Resin Curing ProcessesSynthesis and properties of polymers
T. Stensland、E.F. Fuchs、W.M. Grady 等 4 位作者1997-04-01IEEE Transactions on Power Delivery
This paper presents two approaches for calculating the iron-core and copper losses of a 25 kVA single-phase pole transformer subjected to low-frequency voltage harmonics: an approximate calculation and a finite-element computer model. These methods can be applied to any transformer of similar construction by simply ch…
Magnetic Properties and ApplicationsPower Transformer Diagnostics and InsulationThermal Analysis in Power Transmission
Tullio Caronna、M. Forte、M. Catellani 等 4 位作者1997-04-01Chemistry of Materials
A study to clarify the mechanism of the photochemical degradation of poly(3-alkylthiophene)s in the solid state was carried out. The isolation of two low molecular weight products allowed us to determine that the polymer, under irradiation of visible light, gives rise to singlet oxygen that will, in turn, cause oxidat…
Organic Electronics and PhotovoltaicsAdvanced Sensor and Energy Harvesting MaterialsConducting polymers and applications
L. Peter Martin、M. Rosen1997-04-01Journal of the American Ceramic Society
Specific surface area and longitudinal wave ultrasonic velocity were measured in zinc oxide (ZnO) powder compacts partially sintered to different pore fractions ( P ). A linear correlation was observed between the reduction in surface area and the increase in ultrasonic velocity at all P up to the onset of pore closur…
Advanced ceramic materials synthesisNumerical methods in engineeringComposite Material Mechanics