František Hartl、Derk J. Stufkens、Antonı́n Vlček1992-04-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTNature of the manganese(I)-dioxolene bonding as a function of the ligand oxidation state: UV-visible, IR, and resonance Raman spectroelectrochemical study of [Mn(CO)3Ln(Diox)]z (n = 0, 1; z = -2, -1, 0, +1) and [Mn(CO)2{P(OEt)3}m(Diox)]z (m = 1, 2; z = -1, 0, +1) complexesFr…
Metal complexes synthesis and propertiesMagnetism in coordination complexesPorphyrin and Phthalocyanine Chemistry
Susan E. Van Kirk、Steve W. Martin1992-04-01Journal of the American Ceramic Society
Transparent glasses with densities greater than 8 g/mL, which are resistant to nuclear radiation damage and can serve as a host for rare‐earth scintillators, are being developed. Glasses in the PbO–Bi 2 O 3 system are known to have some of the highest densities yet reported. In this study, a thorough reexamination of…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsDigital Radiography and Breast Imaging
Takeshi Yasuda、Masayo Miyama、H. Yasuda1992-04-01Textile Research Journal
Dynamic water vapor and heat transport in the transient state was investigated for fabrics made of polyester, acrylic, cotton, and wool fibers. The overall dissipation rate of water vapor depends on both the vapor transport rate and the vapor absorption by fibers, which are mutually interrelated. Water vapor transport…
Surface Modification and SuperhydrophobicityTextile materials and evaluationsFluid Dynamics and Thin Films
Deborah S. Franzblau、J. Tersoff1992-04-01Physical Review Letters
A standard model of glasses is shown to exhibit unexpected and remarkably simple elastic properties. For a sequence of networks of decreasing degree or coordination z, the number of zero-frequency vibrational modes (also called ``degrees of freedom'') increases as ${\mathit{e}}^{\mathrm{\ensuremath{-}}\mathit{z}/\math…
Material Dynamics and PropertiesTheoretical and Computational PhysicsTopological and Geometric Data Analysis
Robert Ruh、Michael Kearns、Avigdor Zangvil 等 4 位作者1992-04-01Journal of the American Ceramic Society
Boron carbide–boron nitride particulate composites were fabricated by vacuum hot‐pressing. Near‐theoretical densities of B 4 C were obtained, but percent theoretical densities decreased with increasing amounts of BN. The grain size of B 4 C and BN was not affected by composition, but the amount of twinning in B 4 C de…
Advanced ceramic materials synthesisAluminum Alloys Composites PropertiesBoron and Carbon Nanomaterials Research
Robert G. Hill、Christopher Goat、David J. Wood1992-04-01Journal of the American Ceramic Society
A SiO 2 ─Al 2 O 3 ─CaO─CaF 2 ionomer glass was investigated using thermal analysis, X‐ray diffraction, and scanning electron microscopy. The purpose of this investigation was to control the susceptibility of the glass to acid attack. The differential thermal analysis trace exhibited a sharp glass transition at about 6…
Advanced ceramic materials synthesisGlass properties and applicationsNuclear materials and radiation effects
David A. Carter、Jeanne E. Pemberton1992-04-01Langmuir
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSurface-enhanced Raman scattering of the acid-base forms of imidazole on silverDavid A. Carter and Jeanne E. PembertonCite this: Langmuir 1992, 8, 4, 1218–1225Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April 1992ht…
Gold and Silver Nanoparticles Synthesis and ApplicationsElectrochemical Analysis and ApplicationsProtein Interaction Studies and Fluorescence Analysis
Alain Petit、A. Loupy、Ph. Maiuardb 等 4 位作者1992-04-01Synthetic Communications
We report a simple and quick synthesis of tetrapyrrolic macrocycle in dry media conditions, under microwave irradiation. Heating in microwave oven pyrrole and benzaldehyde adsorbed on a solid acidic support affords tetraphenylporphyrin within ten minutes with very simplified treatment and purification.
Multicomponent Synthesis of HeterocyclesPorphyrin and Phthalocyanine ChemistrySynthesis and Biological Evaluation
R. Glynn Holt、Lawrence A. Crum1992-04-01The Journal of the Acoustical Society of America
An experimental technique for measuring the time-varying response of an oscillating, acoustically levitated air bubble in water is developed. The bubble is levitated in a resonant cell driven in the (r,θ,z) mode of (1,0,1) at a frequency fd≊24 kHz. Linearly polarized laser light (Ar–I 488.0 nm) is scattered from the b…
Microfluidic and Bio-sensing TechnologiesUnderwater Acoustics ResearchUltrasound and Cavitation Phenomena
R. L. Aitken1992-04-01Soil Research
The objectives of this study were to examine (1) interrelationships between various forms of extractable A1 and selected soil properties, (2) the contribution of extractable A1 to pH buffer capacity, and (3) investigate the use of extractable A1 to predict lime requirement. Aluminium was extracted from each of 60 Quee…
Soil and Unsaturated FlowClay minerals and soil interactionsMine drainage and remediation techniques
K. Liang、Janusz Grȩbowicz、Enrique M. Vallés 等 5 位作者1992-04-01Journal of Polymer Science Part B Polymer Physics
Abstract Blends of an aromatic polyethersulfone (commercial name Victrex) and a polyimide (commercial name Matrimid 5218), the condensation product of 3,3′,4,4′‐benzophenone tetracarboxylic dianhydride and 5(6)‐amino‐1‐(4′‐aminophenyl)‐1,3,3′‐trimethylindane, were studied by differential scanning calorimetry, dynamic…
Polymer crystallization and propertiesPolymer Nanocomposites and PropertiesSynthesis and properties of polymers
H. Claus、A. Büssenschütt、M. Henzler1992-04-01Review of Scientific Instruments
Low-energy electron diffraction (LEED) is a well established technique for evaluation of the surface atom arrangement. The information is derived from the elastically scattered electrons. Usually the thermal diffuse background between diffraction spots is assumed to be constant and subtracted as a constant. For spot p…
Advanced Electron Microscopy Techniques and ApplicationsX-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy Techniques
Werner Maschek、Claus Dieter Munz、L. Meyer1992-04-01Nuclear Technology
Analyses of unprotected loss-of-flow accidents for medium-size cores of current liquid-metal fast breeder reactors have shown that the accident proceeds into a transition phase where further meltdown is accompanied by recriticalities and secondary excursions. Assuming very pessimistic conditions concerning fuel discha…
Nuclear reactor physics and engineeringNuclear Materials and PropertiesNuclear Engineering Thermal-Hydraulics
Monique Fréchette、Ian R. Butler、Rosemary C. Hynes 等 4 位作者1992-04-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructures in solution and in the solid state of the complexes of lanthanum(III) with 1,10-phenanthroline. X-ray crystallographic and proton, carbon-13, oxygen-17 and lanthanum-139 solution NMR studiesMonique Frechette, Ian R. Butler, Rosemary Hynes, and Christian DetellierC…
Radioactive element chemistry and processingLanthanide and Transition Metal ComplexesNMR spectroscopy and applications
G.C. Stone、R.G. van Heeswijk、R. Bartnikas1992-04-01IEEE Transactions on Electrical Insulation
An extensive statistical accelerated aging experiment, involving a total of 180 unfilled type epoxy specimens, has been conducted to determine the number of voltage surges required to initiate electrical trees under various magnitudes, surge repetition rates, and polarity conditions. The specimens were tested one at a…
High voltage insulation and dielectric phenomenaLightning and Electromagnetic PhenomenaElectrostatic Discharge in Electronics
Pau-Lin Chen、Roger Barker、Gary W. Smith 等 4 位作者1992-04-01Textile Research Journal
Two groups of weft-knitted fabrics, single and double knits, were selected to represent typical summer T-shirts and winter sportswear such as sweaters and other knit tops. Two kinds of analyses were performed: subjective overall handle and primary sensory factors were evaluated using a 99 point polar-word scale, and p…
Textile materials and evaluationsErgonomics and Musculoskeletal DisordersColor perception and design
R. Ostermeir、Karl Brünner、G. Abstreiter 等 4 位作者1992-04-01IEEE Transactions on Electron Devices
The local rise of lattice temperature in n-MOSFETs is analyzed by the energy shift of the silicon optical phonon using Raman spectroscopy with submicrometer spatial resolution. When operating the devices in saturation, a source-drain temperature asymmetry is observed corresponding to the heat dissipation profile that…
Photonic and Optical DevicesThin-Film Transistor TechnologiesSilicon Nanostructures and Photoluminescence
James R. Keogh、Fredrik F. Velander、John W. Eaton1992-04-01Journal of Biomedical Materials Research
Surfaces of implantable and blood contact-devices accumulate adsorbed and denatured proteins. This anomalous layer of proteins may help trigger unwanted events such as activation of coagulation systems and, perhaps, chronic inflammation. Because, in many experimental systems, the purposeful coating of surfaces with al…
Nanoparticle-Based Drug DeliveryPolymer Surface Interaction StudiesProtein purification and stability
Michael Hird、G. W. Gray、Kenneth J. Toyne1992-04-01Liquid Crystals
Terphenyls with two lateral ortho-fluoro-substituents have proved to be excellent host materials for ferroelectric (SC∗) mixtures. The compounds reported here are biphenyls with the same arrangement of lateral substituents but with a trans-4-alkylcyclohexylethyl moiety as one of the terminal substituents. Such three r…
Liquid Crystal Research AdvancementsSynthesis and Properties of Aromatic Compounds
Eric P. Visser、Erwin H. Versteegen、W.J.P. van Enckevort1992-04-01Journal of Applied Physics
A method to determine the thermal diffusivity in thin films, based on the measurement and analysis of thermal waves induced by a modulated infrared laser, is demonstrated. A nearly exact mathematical description, independent of the film geometry and including surface heat losses, is presented. It is shown that the in-…
Thermal properties of materialsAdhesion, Friction, and Surface InteractionsThermography and Photoacoustic Techniques