V. Bertolasi、V. Ferretti、P. Gilli 等 4 位作者1993-01-01Journal of the Chemical Society Perkin Transactions 2
The crystal structures of five 4-aminophenyl 4-X-phenyl sulfones (X = NO2, CN, F, OCH3, NH2) are reported. The molecules present a relevant degree of charge redistribution where electronic charge transfer mainly occurs from the amino to the sulfonyl group with consequent shortening of C–N and C–S distances and increas…
Nonlinear Optical Materials ResearchSulfur-Based Synthesis TechniquesOrganic and Inorganic Chemical Reactions
H. Müller、Yoshinobu Ueba1993-01-01Synthesis
All articles of this category 5,6-Dihydro-1,3-dithiolo[4,5- b ][1,4]dithiin-2-one ( 3 ) was prepared in one step starting from thiapendione ( 1 ; [1,3]dithiolo[4, 5- d ][1,3]dithiole-2,5-dione) in 55% yield via 4,5-dimercapto-1, 3-dithiol-2-one ( 2 ). Coupling of 3 in triethyl phosphite gave bis(ethylenedithio)tetrath…
Organic and Molecular Conductors ResearchPhenothiazines and Benzothiazines Synthesis and Activities
Mogens Bjerg Mogensen1993-01-01ECS Proceedings Volumes
The reaction kinetics for oxidation of H 2 on the Ni-YSZ-cermet electrode in Solid Oxide Fuel Cells (SOFC) have been studied using impedance spectroscopy. The polarisation resistance, R P , has been found to consist of two separate contributions with one being strongly dependent on both the partial pressure of H 2 , p…
Electrocatalysts for Energy ConversionAdvancements in Solid Oxide Fuel CellsGas Sensing Nanomaterials and Sensors
Katsutoshi Komeya、Noriyuki Matsukaze、Takeshi Meguro1993-01-01Journal of the Ceramic Society of Japan
Direct nitridation of Al-alloys such as Al-Y, Al-Ca, and Al-Li was investigated with particular emphasis on the alloy composition, reaction temperature and reaction time. The alloys Al-2.3wt% Li, Al-5.0wt% Li and Al-5.0wt% Ca converted completely to AlN in very short soaking time at 1000°C. For Al-1.0wt% Li and Al-0.5…
GaN-based semiconductor devices and materialsAdvanced ceramic materials synthesisAluminum Alloys Composites Properties
M. Miyamoto、Toshiro Takase、Yoshitaka Mitsuda1993-01-01Mineralogical Journal
We measured Raman spectra of diamonds in ureilite meteorites and of diamonds synthesized under static high pressure, under shock-induced high pressure, and by chemical vapor deposition. The full width at half maximum (FWHM) and wavenumber position of a Raman line of F2g (at 1332 cm−1) are compared. Both the wavenumber…
Geological and Geochemical AnalysisHigh-pressure geophysics and materialsDiamond and Carbon-based Materials Research
Michael Kotik、H. Zuber1993-01-01European Journal of Biochemistry
In order to investigate the physical basis of protein stability, two mutant L-lactate dehydrogenases (LDH) and the wild-type enzyme from Bacillus megaterium were analyzed for differences in quaternary structure, global protein conformation, thermal stability, stability against guanidine hydrochloride, and polypeptide…
Protein Structure and DynamicsProtein purification and stabilityEnzyme Structure and Function
Mathias O. Senge、K. Ruhlandt‐Senge、Kevin J. Regli 等 4 位作者1993-01-01Journal of the Chemical Society Dalton Transactions
Several thallium(III) porphyrin complexes [Tl(por)X] with the axial ligand x = MeCO2, CF3CO2, Cl, Br, l, CN, SCN or N3, have been obtained via ligand-exchange reactions from the corresponding thallium(III) trifluoroacetates. All compounds were characterized by 1H NMR, UV/VIS spectroscopy, and elemental analysis. Fourt…
Metal complexes synthesis and propertiesPorphyrin and Phthalocyanine ChemistryLanthanide and Transition Metal Complexes
Klaüs Praefcke、Dirk Blunk1993-01-01Liquid Crystals
Selectively O-alkylated inositols of myo-, scyllo- and chiro-configuration allow detailed studies of the relationship between the substitution pattern in the cyclohexane ring and the liquid crystalline properties observed to be made for these mainly novel cyclic compounds containing hydroxyl functions. The types of th…
Liquid Crystal Research AdvancementsSynthesis and Properties of Aromatic CompoundsMolecular spectroscopy and chirality
Akira KINBARA、Akira Kikuchi、Shigeru Baba 等 4 位作者1993-01-01Journal of Adhesion Science and Technology
PTFE foils were plasma-treated in order to enhance their adhesion to thin films. The effect of plasma treatment using argon and oxygen discharge gases on the surface energy of PTFE foils was examined by measuring the contact angles of water droplets placed on the foil surface. Exposure to the plasma for only about 10-…
Surface Modification and SuperhydrophobicityCopper Interconnects and ReliabilityAdhesion, Friction, and Surface Interactions
G. Lagaly、Heinrich M. Köster1993-01-01Steinkopff eBooks
Tone sind unverfestigte Sedimentgesteine. Sie bestehen im wesentlichen aus Mineralpartikeln kleiner 20 μm im Durchmesser. Unter diesen Partikeln herrschen blättchenförmige silicatische Tonminerale mengenmäßig vor, deren Teilchendurchmesser meistens kleiner als 2 μm sind. Altersmäßig gehören die unverfestigten Tone fas…
Geological and Geochemical AnalysisBuilding materials and conservationClay minerals and soil interactions
John R. Helliwell、S.E. Ealick、Park Doing 等 5 位作者1993-01-01Acta Crystallographica Section D Biological Crystallography
Synchrotron radiation has been used extensively to overcome a variety of technical challenges involved in data collection from macromolecular crystals. The next generation of such sources offer a higher brilliance at much shorter wavelengths than hitherto available. Hence, the quality of X-ray diffraction data from cr…
Protein Structure and DynamicsEnzyme Structure and FunctionMolecular Biology Techniques and Applications
Sara Bastida、J. I. Eguiazábal、J. Nazábal1993-01-01Polymer Testing
The possibility of using the Vicat softening-point test as an additional method to find the phase behaviour of amorphous polymer blends is discussed. The comparison of the TgS by DSC to the Vicat temperatures of three blends, miscible, immiscible and partially miscible, allows us to interpret the different Vicat softe…
Polymer crystallization and propertiesMaterial Dynamics and PropertiesPolymer Nanocomposites and Properties
Janet Blümel、Peter Hofmann、Frank H. Köhler1993-01-01Magnetic Resonance in Chemistry
Abstract The methylated metallocenes (MeCp) 2 M with M = V, Cr, Mn, Co, Ni (1–5) were investigated by 1 H and 2 H NMR spectroscopy at natural abundance. The 2 H NMR signals are narrower by a factor of up to 30 compared with the corresponding 1 H NMR signals, thus establishing an inexpensive method and a general improv…
Magnetism in coordination complexesAdvanced NMR Techniques and ApplicationsElectron Spin Resonance Studies
A. W. Ruff、Raymond Bayer1993-01-01OpenAlex
Description 12 peer-reviewed papers provide practical information on the selection and use of wear tests in engineering. Includes guidance in deciding how to test for wear of new materials or design; actual examples of successful wear testing; and suggested approaches by experts.
Mechanical stress and fatigue analysisTribology and Wear AnalysisMetal Alloys Wear and Properties
W Stinchcomb、Noel E. Ashbaugh1993-01-01OpenAlex
Description Addresses current issues related to fatigue and fracture of composites and practical insights on new developments in damage and failure analysis and test methods. Provides new directions for emerging technology areas, such as micro mechanics and interfacial analysis, which are applicable to fatigue and fra…
Material Properties and Applications
Setsuhisa Tanabe、T. Ohyagi、Teiichi Hanada 等 4 位作者1993-01-01Journal of the Ceramic Society of Japan
The optical properties of Er3+ ions doped in aluminate glasses were investigated.(1) Among three intensity parameters obtained from absorption spectra by Judd-Ofelt theory, Ω2 and Ω4 showed a large value compared with those in other oxide glasses.(2) The multiphonon decay rates of the 4S3/2 and 4F9/2 levels were obtai…
Luminescence Properties of Advanced MaterialsGlass properties and applicationsPhotorefractive and Nonlinear Optics
Christoph W. Müller、Georg E. Schulz1993-01-01Proteins Structure Function and Bioinformatics
Two mutants of adenylate kinase from Escherichia coli have been crystallized and analyzed by X-ray diffraction at resolutions of 3.4 and 2.4 A, respectively. These mutants are Pro-9-->Leu and Gly-10-->Val. They were selected for their positions in the highly conserved Gly-loop forming a giant anion hole for the beta-p…
Protein Structure and DynamicsRNA and protein synthesis mechanismsEnzyme Structure and Function
Andrew S. Gordon、Valerie J. Harwood、S Sayyar1993-01-01Applied and Environmental Microbiology
The influence of elevated copper concentrations on cell numbers and extracellular protein production was investigated in chemostat cultures of Vibrio alginolyticus. High (20 microM) copper in the medium reservoir resulted in a dramatic drop in cell numbers which was overcome with time. The copper-stressed cultures est…
Calcium Carbonate Crystallization and InhibitionEnzyme Production and CharacterizationVibrio bacteria research studies
D. B. Mitton、John Walton、G.E. Thompson1993-01-01Surface and Interface Analysis
Abstract The initial oxidation behaviour of a Co–20%Ni alloy exposed to air and the longer term oxidation of a metalevaporated magnetic recording tape (MET) of the same composition have been studied using XPS and AES. Air exposure of the alloy for 24 h showed the formation of a mixed hydroxide/carbonate layer over a r…
Corrosion Behavior and InhibitionSemiconductor materials and devicesCopper Interconnects and Reliability
Steve Roberts、P. B. Hirsch、A.S. Booth 等 5 位作者1993-01-01Physica Scripta
The brittle-ductile transition (BDT) in precracked Si and other pure covalent crystals is associated with plastic relaxation processes induced by the crack tip stress field. A model which simulates the dynamic behaviour of shielding dislocations near a crack tip under an increasing stress has been developed. Dislocati…
Advanced ceramic materials synthesisMicrostructure and mechanical propertiesHigh-Velocity Impact and Material Behavior