Vladimir A. Оvchynnikov、Taras P. Timoshenko、Vladimir M. Аmirkhanov 等 5 位作者2000-04-01Zeitschrift für Naturforschung B
Abstract Lanthanide, Carbacylamidophosphate The coordination compounds of the general formula Ln(NO 3 ) 3 (HL) 2 (H 2 O) 2 H 2 O , where Ln = La, Ce -Nd, Sm -Dy, HL = CCl 3 C(O)NHP(O)[N(CH 2 CH 2 ) 2 O] 2 , dimorpholido-N-tri-chloroacetylphosphorylamide, have been synthesized. The complexes were studied by IR, 1 H and…
Crystal structures of chemical compoundsLanthanide and Transition Metal ComplexesPolyoxometalates: Synthesis and Applications
Zhijun Xiao、Brian S. Mitchell2000-04-01Journal of the American Ceramic Society
An investigation of the mullite decomposition mechanism and kinetics in the temperature range 1900—2000°C was conducted. SEM‐EDS and XRD analysis showed that the decomposition of mullite in this temperature range was primarily caused by the presence of carbon from furnace components. A reaction mechanism, in which gas…
Advanced ceramic materials synthesisRecycling and utilization of industrial and municipal waste in materials productionAdvanced materials and composites
O. I. Purskiı̆、N. N. Zholonko、V. A. Konstantinov2000-04-01Low Temperature Physics
The isobaric thermal conductivity of solid SF6 is investigated in the high-temperature phase. The experimental results are rescaled to a constant density. The isochoric thermal conductivity initially decreases with increasing temperature, then passes through a smooth minimum and begins to grow. A modified version of t…
Thermal properties of materialsSuperconductivity in MgB2 and AlloysThermal Expansion and Ionic Conductivity
Kenji Nomiya、Takeshi Hasegawa2000-04-01Chemistry Letters
Abstract A novel polyoxotungstate-based 2 : 1-type Cp*Rh2+ complex, (Bun4N)5[(Cp*Rh)2P2W15V3O62] (Cp* = C5Me5), was synthesized by a direct reaction of the Dawson trivanadium-substituted polyoxotungstate (Bun4N)9[α-1,2,3-P2W15V3O62] with an equimolar amount of [Cp*RhCl2]2 in ice-cooled CH2Cl2, without use of silver(I)…
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsAdvanced Nanomaterials in Catalysis
F. D. A. Aarão Reis、D. F. Franceschini2000-04-01Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics
We studied models of deposition and erosion, with two species of particles, that represent quantitatively many features of amorphous carbon-nitrogen film grown under plasma enhanced chemical vapor deposition. In the original model, the columns of the deposit are independent, and particles C and N are released with pro…
Diamond and Carbon-based Materials ResearchTheoretical and Computational PhysicsIon-surface interactions and analysis
Eugene G. Gamaly、Andrei V. Rode、Barry Luther‐Davies2000-04-01Laser and Particle Beams
The ultra-fast ablation of a graphite target using high repetition rate Nd:YAG lasers allows us to deposit two distinctly different carbonaceous structures, depending on the ambient Ar pressure: a diamond-like carbon film with the surface finish down to atomic level at a pressure below 0.1 Torr, and a fractal C nanofo…
Diamond and Carbon-based Materials ResearchLaser-induced spectroscopy and plasmaLaser-Ablation Synthesis of Nanoparticles
S. Lorenz、Markus Perbandt、Corinna Lippmann 等 7 位作者2000-04-01Acta Crystallographica Section D Biological Crystallography
Thermus flavus 5S rRNA with a molecular weight of about 40 kDa was modified at the 5' and 3' ends. Crystals were obtained under earth and microgravity conditions. The best crystals were obtained during NASA space mission STS 94. For the first time, it was possible to collect a complete data set from 5S rRNA crystals t…
Genomics and Phylogenetic StudiesRNA and protein synthesis mechanismsEnzyme Structure and Function
J. J. Préjean、J.C. Lasjaunias、Claire Berger 等 4 位作者2000-04-01Physical review. B, Condensed matter
We report on resistivity, magnetic susceptibility, and very low-$T$ specific heat ${(C}_{p})$ of a i-AlPdRe quasicrytalline sample which, from resistivity measurements, is believed to lie on the insulating side of a metal-insulator (MI) transition. We find an electronic contribution to ${C}_{p},$ which possibly obeys…
Rare-earth and actinide compoundsQuasicrystal Structures and PropertiesX-ray Diffraction in Crystallography
Ryosuke Matsuoka、Tatsuto Yui、Ryo Sasai 等 5 位作者2000-04-01Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals
Tetra-(4-sulfonatophenyl)porphyrinatotin(IV) aggregated efficiently in a clay (saponite) layer intercalated with a polyfluorinated surfactant, but no aggregation was observed in a hydrocarbon type surfactant-clay hybrid environment. Germanium(IV) porphyrins remained as monomers even in the polyfluorinated environment.
Porphyrin and Phthalocyanine ChemistryAnalytical Chemistry and SensorsSurface Chemistry and Catalysis
Young I. Cho Won Tae Kim2000-04-01Experimental Heat Transfer
The objective of the present study was to investigate the behavior of CaCO3 crystal formation at the very beginning stage of fouling. This article describes an experimental method which employs a light microscope system to visualize crystal growth behavior during the fouling process inside a transparent rectangular ch…
Calcium Carbonate Crystallization and Inhibition
P. Held、H. Hellwig、Sven Rühle 等 4 位作者2000-04-01Journal of Applied Crystallography
Using a standard evaporation technique at 311 K, large single crystals of the polar orthorhombic potassium rare earth nitrates K 2 RE(NO 3 ) 5 .2H 2 O, where RE = La, Ce, Pr or Nd, of optical quality and dimensions up to 5 × 5 × 4 cm, were grown from aqueous solutions containing a stoichiometric ratio of potassium and…
Magnetism in coordination complexesCrystal Structures and PropertiesLanthanide and Transition Metal Complexes
А. А. Назаров2000-04-01Philosophical Magazine Letters
Grain-boundary diffusion in the regime affected by internal stresses of triple-line disclinations is analysed. The concentration profiles in a stressed solid averaged over a distribution of hydrostatic stress gradients are calculated. It is shown that the stresses from triple-line disclinations in as-prepared submicro…
Microstructure and mechanical propertiesAdvanced materials and compositesMaterial Properties and Failure Mechanisms
Jianlin Shi、J. D. Zhang2000-04-01Journal of the American Ceramic Society
The compaction behavior of fine alumina powders with different particle sizes or bimodal particle‐size distributions that are undergoing pressure filtration was investigated. Three alumina powders—average particle sizes of 0.2—0.86 μm—were compacted to a solids fraction of 62—65 vol% from suspensions at pH 3, which wa…
Advanced ceramic materials synthesisGranular flow and fluidized bedsPolymer Foaming and Composites
Giuseppe Quartarone、A. Zingales、T. Bellomi 等 5 位作者2000-04-01British Corrosion Journal
Inhibition of the corrosion of copper in aerated 0·5M sulphuric acid solutions containing various concentrations of indole-5-carboxylic acid was studied in the temperature range 25–55°C using potentiodynamic curves (Tafel lines), weight loss, analytical methods, and determination of double layer capacitance. The corro…
Corrosion Behavior and InhibitionElectrochemical Analysis and ApplicationsConcrete Corrosion and Durability
Serguei Kovalev、Tatsuya Miyajima、Yukihiko Yamauchi 等 4 位作者2000-04-01Journal of the American Ceramic Society
Crack bridging associated with the pull‐out process of interlocking grains in self‐reinforced ceramic materials is studied through a micromechanical simulation. The pullout of a single inclined grain is modeled via the numerical solution of a general contact problem. The bridging‐force versus crack‐opening‐distance cu…
Advanced ceramic materials synthesisAdvanced materials and compositesTunneling and Rock Mechanics
Jie Fu2000-04-01Journal of the American Ceramic Society
Glasses with compositions Li 1.2 M 0.2 Ge 1.8 (PO 4 ) 3 (M = Al, Ga, Y, Gd, Dy, and La) were prepared and converted to glass‐ceramics by heat treatment. The effects of the M 3+ ions on the conductivity of the glasses and glass‐ceramics were studied. The main phase present in the glass‐ceramics was the conductive phase…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsMicrowave Dielectric Ceramics Synthesis
José Ribeiro Gregório、Annelise Engel Gerbase、Márcia Martinelli 等 7 位作者2000-04-01Macromolecular Rapid Communications
The biphasic system methyltrioxorhenium (MTO)-H2O2/CH2Cl2 was studied in the epoxidation of polybutadiene and the results showed that this system presents a high selectivity and the extension of epoxidation (10–50%) can be modulated by the amount of oxidant added, without significant change in the molecular weight of…
biodegradable polymer synthesis and propertiesPolyoxometalates: Synthesis and ApplicationsCarbon dioxide utilization in catalysis
Pitchumani Sivakumar、R. Arichandran、Lonchin Suguna 等 5 位作者2000-04-01Journal of Fish Biology
The skin of catfish Gariepinus spp. reared in tannery effuent water (ETP) had an increased collagen content, decreased acid solubility and high carbohydrate association as compared with skin of normal fish. The skin collagen in either fish was composed of three distinct α chains with mobilities different from that of…
Marine Biology and Environmental ChemistryCollagen: Extraction and CharacterizationBone and Dental Protein Studies
K. V. Yumashev、N. N. Posnov、I. A. Denisov 等 8 位作者2000-04-01Journal of the Optical Society of America B
Transient differential absorption spectra of solgel glasses that contain copper selenide nanoparticles (NP’s) have been studied with a picosecond pump–probe technique. Oxidation of copper selenide NP’s results in the appearance of an additional absorption band peaked at ∼1 µm, which can be transiently bleached under l…
Glass properties and applicationsSolid State Laser TechnologiesNonlinear Optical Materials Studies
Gerhard Haase2000-04-01International Reviews in Physical Chemistry
Atomically-resolved surface photovoltage (SPV) imaging with a scanning tunnelling microscope was used by several laboratories to reveal the local degree of sub-surface electronic band bending at and around defects and adsorbates on various semiconductor surfaces. It turns out that the scanning tunnelling microscope ti…
Advanced Electron Microscopy Techniques and ApplicationsElectron and X-Ray Spectroscopy TechniquesSurface and Thin Film Phenomena