E. Ramírez‐Vargas、Francisco J. Medellín‐Rodríguez、Dámaso Navarro‐Rodríguez 等 6 位作者2002-06-01Polymer Engineering and Science
Abstract Morphological characteristics and mechanical properties of PP‐EP/EVA blends were studied and compared to those of PP/EVA previously reported. For the PPEP/EVA blends, interfacial interactions in amorphous zones, which were associated with shifts in T g , were well defined compared to those of PP/EVA blends, a…
Polymer crystallization and propertiesPolymer Nanocomposites and Propertiesbiodegradable polymer synthesis and properties
Klaüs Praefcke2002-06-01Brazilian Journal of Physics
On the basis and with the inclusion of results described in a previous paper [2], submitted for publication almost two years ago, we add some comments on very recent developments regarding both the design and synthesis of thermotropic nematogens of low-molecular weight, supposed biaxial in character, as well as puzzle…
Liquid Crystal Research AdvancementsSupramolecular Self-Assembly in MaterialsAdvanced Materials and Mechanics
Sandeep Tyagi、Anup K. Ghosh2002-06-01Polymer Engineering and Science
Abstract The present work reports evolution of morphology from initial (presence of striation) to final (droplet formation) stages in a single‐screw extruder. Morphology development during the blending process controls the final size of the dispersed phase, which in turn significantly affects the properties of the ble…
Polymer crystallization and propertiesRheology and Fluid Dynamics StudiesPolymer Foaming and Composites
S. L. S. Stipp2002-06-01Molecular Simulation
Better understanding of mineral surface reactivity can improve control of crystal growth and dissolution which is central to biomineralisation, design of advanced materials and preventing transport of toxic substances in the environment. Some experimental observations of fundamental processes on calcite using high-res…
Calcium Carbonate Crystallization and InhibitionMinerals Flotation and Separation TechniquesCrystallization and Solubility Studies
Henning Henschel、O. Köhn、Udo Weinand2002-06-01IEEE Transactions on Nuclear Science
The new Heraeus STU fiber, which is very similar to the radiation resistant Russian KS-4V fiber, was subjected to /sup 60/Co gamma irradiation tests for the first time. The results of spectral measurements (300-850 nm) as well as of measurements at 829 and 1310 nm with different dose rates were compared with those of…
Diamond and Carbon-based Materials ResearchGlass properties and applicationsSemiconductor Lasers and Optical Devices
Ling Zheng、Yingxin Wang、Joel L. Plawsky 等 4 位作者2002-06-01Langmuir
The slow growth characteristics of a condensing ethanol sessile drop on a quartz substrate were studied experimentally. Using interference microscopy measurements of the transient liquid film profile (curvature) to obtain the pressure field and a Kelvin−Clapeyron model of interfacial mass flux to obtain the interfacia…
Surface Modification and SuperhydrophobicityNanomaterials and Printing TechnologiesFluid Dynamics and Thin Films
Francesco Di Benedetto、G. P. Bernardini、Daniele Borrini 等 9 位作者2002-06-01The Canadian Mineralogist
One hundred and thirty samples from the collection of the Natural History Museum in Florence, labeled as tetrahedrite, have \nbeen extensively studied by means of SEM, XRD, EPMA, DTA, EPR and SQUID techniques. Wide-ranging substitutions, \nconfirmed by compositional data, play a fundamental role in the thermal…
Iron oxide chemistry and applicationsX-ray Diffraction in CrystallographyMineralogy and Gemology Studies
Masahiko Iyoda、Masashi Hasegawa、Junichi Takano 等 5 位作者2002-06-01Chemistry Letters
Abstract Dimeric TTFs have been synthesized by using palladium-catalyzed reactions. Although TTFs are very sensitive under oxidation conditions, the palladium-catalyzed reactions can be successfully employed for the oxidative coupling of TTF derivatives. The chemical oxidation of dimeric TTFs produced cation-radicals,…
Magnetism in coordination complexesOrganic and Molecular Conductors ResearchElectron Spin Resonance Studies
Fabio Luterotti、Giulio Schimperna、Ulisse Stefanelli2002-06-01Quarterly of Applied Mathematics
This note deals with a nonlinear system of PDEs describing some irreversible phase change phenomena that account for a bounded limit velocity of the phase transition process. An existence result is established by using time discretization, compactness arguments, and techniques of subdifferential operators.
Solidification and crystal growth phenomenaStability and Controllability of Differential EquationsFluid Dynamics and Thin Films
Kai Gao、Kexiong Tan、Fuqi Li 等 4 位作者2002-06-01IEEE Transactions on Dielectrics and Electrical Insulation
The application of six different kinds of characteristic vectors to recognize PD sources is studied. Four kinds of model bars are used to simulate typical partial discharges in generator stator winding. The PD signals were measured by using a computer aided digital sampling system. The sampling results are processed b…
High voltage insulation and dielectric phenomenaPower Transformer Diagnostics and InsulationHigh-Voltage Power Transmission Systems
Robert S. Phillips、Tatyana V. Demidkina、Lyudmila N. Zakomirdina 等 6 位作者2002-06-01Journal of Biological Chemistry
The binding of substrates and inhibitors to wild-type Proteus vulgaris tryptophan indole-lyase and to wild type and Y71F Citrobacter freundii tyrosine phenol-lyase was investigated in the crystalline state by polarized absorption microspectrophotometry. Oxindolyl-lalanine binds to tryptophan indole-lyase crystals to a…
Enzyme Structure and FunctionPolyamine Metabolism and ApplicationsPharmacological Effects of Natural Compounds
Robila Belghiche、Roland Contant、Yu Wei Lu 等 7 位作者2002-06-01European Journal of Inorganic Chemistry
Stereospecific routes were followed to synthesize five new Fe3+ and Cu2+-substituted Mo-enriched Dawson-type heteropolyanions as aqueous soluble potassium salts: α2-K7[Fe(OH2)P2W12Mo5O61] and α2-K7[Fe(OH2)P2W13Mo4O61], α1- and α2-K8[Cu(OH2)P2W12Mo5O61] and α2-K8[Cu(OH2)P2W13Mo4O61]. The substituted species as well as…
Polyoxometalates: Synthesis and ApplicationsChemical Synthesis and ReactionsChemical Synthesis and Characterization
Ingo Hartenbach、Thomas Schleid2002-06-01Zeitschrift für anorganische und allgemeine Chemie
Die beiden isotypen Thiosilicate KCe[SiS4] (a = 649, 15(6), b = 656, 18(6), c = 863, 96(8) pm, β = 107, 531(9)°) und Eu2[SiS4] (a = 651, 71(6), b = 659, 54(6), c = 821, 93(8) pm, β = 108, 437(9)°) kristallisieren monoklin in der Raumgruppe P21/m mit Z = 2. Bei der Umsetzung von KCl, Ce2S3 und SiS2 im Verhältnis 1 : 1…
Crystal Structures and PropertiesChemical Synthesis and CharacterizationInorganic Chemistry and Materials
Gözen Bereket、A. Yurt2002-06-01Anti-Corrosion Methods and Materials
Potentiodynamic polarisation studies were carried out on the inhibition of low carbon steel in 0.1M hydrochloric acid solution over the temperature range 20‐60°C at different inhibitor concentrations by various quaternary ammonium salts and cationic surfactants. The inhibitors examined were tetraethyl ammonium chlorid…
Corrosion Behavior and InhibitionConcrete Corrosion and DurabilityMaterial Properties and Failure Mechanisms
Maria Paola Luda Di Cortemiglia、G. Ragosta、Pellegrino Musto 等 7 位作者2002-06-01Macromolecular Materials and Engineering
The chemical and morphological structure of new and post-consumer ten years old poly(propylene) based car bumpers has been investigated and their mechanical properties have been correlated to the chemical and physical degradation of the material. Poly(propylene) matrix and a rubbery ethylene-propylene phase were the c…
Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesPolymer Foaming and Composites
Aurora López-Munguira、Fernando Nieto、Diego Morata2002-06-01Clay Minerals
Abstract Chlorites from Cambrian basaltic vesicular lavas, characterized by relatively high X c (0.81-0.98), gave temperatures of formation of 285 to 350 ° C (Cathelineau's empirical geothermometer). Both the X c and temperature calculations gave results which were too high for the diagenetic conditions indicated by t…
Geological and Geochemical AnalysisGeochemistry and Elemental AnalysisClay minerals and soil interactions
Wei Liu、William P. Addiego、Charles M. Sorensen 等 4 位作者2002-06-01Industrial & Engineering Chemistry Research
Honeycomb-shaped monolithic catalysts offer an attractive solution to the long-standing problem of balancing the reactor pressure drop with mass transfer in fixed-bed reactors. This approach is discussed in detail in this paper based on experimental and modeling data for the dehydrogenation of ethylbenzene to styrene.…
Catalytic Processes in Materials ScienceCatalysts for Methane ReformingCatalysis and Oxidation Reactions
Tingkai Li、Sheng Teng Hsu、Bruce Ulrich 等 6 位作者2002-06-01IEEE Electron Device Letters
One transistor ferroelectric nonvolatile memory with gate stack of Pt/Pb5Ge3O/sub 11//lr/poly-Si/SiO2/Si was successfully fabricated. This device features a saturated memory window of 3 V at a programming voltage of higher than 3 V from C-V and I-V measurements. The memory window decays rapidly within 10 seconds after…
Ferroelectric and Piezoelectric MaterialsSemiconductor materials and devicesAcoustic Wave Resonator Technologies
A. L. R. Brennand、James S. Wilkinson2002-06-01Optics Letters
The fabrication of planar waveguides by a constant-current thermal poling procedure in multicomponent glasses rich in alkali or alkaline earth ions is described. Near the anode, the dc electric field applied to the substrate separates the mobile cations into regions according to their mobility. Each region presents a…
Photonic and Optical DevicesGlass properties and applicationsPhotorefractive and Nonlinear Optics
Makoto Ogawa、Kazuyuki Kuroda、Tomoyuki Nakamura2002-06-01Chemistry Letters
Abstract The adsorption and immobilization of tris(2,2′-bipyridine)ruthenium(II) ([Ru(bpy)3]2+) in mesoporous silicas (C18-FSM) modified by the introduction of aluminum as well as sulfonic acid groups were investigated. The complex was immobilized by the cooperative effects of electrostatic interactions between [Ru(bp…
Mesoporous Materials and CatalysisPorphyrin and Phthalocyanine ChemistryLanthanide and Transition Metal Complexes