Christiane Dietrich‐Buchecker、Jean‐François Nierengarten、Jean Pierre Sauvage 等 6 位作者1993-12-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTDicopper(I) trefoil knots and related unknotted molecular systems: influence of ring size and structural factors on their synthesis and electrochemical and excited-state propertiesChristiane O. Dietrich-Buchecker, Jean Francois Nierengarten, Jean Pierre Sauvage, Nicola Armar…
Supramolecular Chemistry and ComplexesMagnetism in coordination complexesPorphyrin and Phthalocyanine Chemistry
V. L. Gurevich、Д. А. Паршин、J. Pelous 等 4 位作者1993-12-01Physical review. B, Condensed matter
We work out a theory of low-energy Raman scattering in glasses. The scattering and the energy transfer are due to interaction of the light with the soft potentials in glasses. We exploit relations between the scattering cross sections at a certain energy transfer, \ensuremath{\Elzxh}\ensuremath{\omega}, and the mean f…
Material Dynamics and PropertiesGlass properties and applicationsRandom lasers and scattering media
Per Linse1993-12-01The Journal of Physical Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTPhase behavior of poly(ethylene oxide)-poly(propylene oxide) block copolymers in aqueous solutionPer LinseCite this: J. Phys. Chem. 1993, 97, 51, 13896–13902Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 19…
Advanced Battery Materials and TechnologiesConducting polymers and applicationsBlock Copolymer Self-Assembly
S. K. J. Al‐Ani1993-12-01International Journal of Electronics
A computational method is applied for the analysis of optical absorption spectra of amorphous materials to obtain both the power index, r, and E opt, the optical band gap, from the theories of Tauc, and Davis and Mott which relate the energy of the incident photon (hw) to the absorption coefficient α(w) i.e. [αhw ∼ (h…
Glass properties and applicationsPhase-change materials and chalcogenidesNonlinear Optical Materials Studies
N. Afify1993-12-01Physical review. B, Condensed matter
The short- and medium-range orders of ${\mathrm{GeSe}}_{2}$ chalcogenide glass were studied by using the radial distribution function. The effect of the annealing temperature on the short-range order structure of this glass was investigated. The short-range order structure of as-prepared and annealed ${\mathrm{GeSe}}_…
Glass properties and applicationsPhase-change materials and chalcogenidesSolid-state spectroscopy and crystallography
V. Di Liello、E. Martuscelli、Pellegrino Musto 等 5 位作者1993-12-01Die Angewandte Makromolekulare Chemie
Abstract A tetrafunctional epoxy resin and a thermosetting bismaleimide resin were modified by adding a thermoplastic polyether imide, commercially available as Ultem 1000. Dynamic‐mechanical data and electron microscopy analyses demonstrated that a two‐phase system was obtained in both the cases after the curing and…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersSilicone and Siloxane Chemistry
H. Toraya、T. C. Huang、Yanqing Wu1993-12-01Journal of Applied Crystallography
An intensity enhancement obtained from asymmetric diffraction with a fixed incident angle α has been studied. Parallel-beam synchrotron radiation with λ = 1.54 Å (Stanford Synchrotron Radiation Laboratory) and λ = 1.53 Å (Photon Factory) was used to collect powder diffraction patterns of Si, CeO 2 ( α = 5 and 10°) and…
Advanced ceramic materials synthesisMicrostructure and Mechanical Properties of SteelsX-ray Diffraction in Crystallography
Qing Ma、D. Raoux、S. Bénazeth1993-12-01Physical review. B, Condensed matter
The local structure of ${\mathrm{As}}_{\mathit{x}}$${\mathrm{Te}}_{100\mathrm{\ensuremath{-}}\mathit{x}}$ glassy semiconductors has been studied using x-ray anomalous scattering and x-ray-absorption spectroscopy as a function of the composition. Two important findings are (a) tellurium (Te) atoms are twofold coordinat…
Glass properties and applicationsMetallic Glasses and Amorphous AlloysPhase-change materials and chalcogenides
Janice M. Davis、Hans Peter Bächinger1993-12-01Journal of Biological Chemistry
A hysteresis is observed in the triple helix-coil transition of type III collagen. This hysteresis appears in the thermal transition, where it is not solvent-dependent, and also in the transition induced by guanidinium hydrochloride. The transitions are observed both by optical rotatory dispersion and by trypsin diges…
Connective tissue disorders researchSkin and Cellular Biology ResearchCollagen: Extraction and Characterization
T. Delort、D. Maystre1993-12-01Journal of the Optical Society of America A
The purpose of the method described in this paper is to identify with precision sharp phenomena and to produce reliable solutions for various kinds of one-dimensional grating problems in the resonance domain, without limitation in the geometry or the electromagnetic parameters. The theory lies in the use of finite ele…
Electromagnetic Simulation and Numerical MethodsAdvanced Surface Polishing TechniquesOptical Coatings and Gratings
R. Calvo、Carlos A. Steren、Oscar E. Piro 等 6 位作者1993-12-01Inorganic Chemistry
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCrystal structure and magnetic properties of diaqua(L-aspartato)copper(II)R. Calvo, C. A. Steren, O. E. Piro, T. Rojo, F. J. Zuniga, and E. E. CastellanoCite this: Inorg. Chem. 1993, 32, 26, 6016–6022Publication Date (Print):December 1, 1993Publication History Published onli…
Magnetism in coordination complexesLanthanide and Transition Metal ComplexesMetal-Catalyzed Oxygenation Mechanisms
Paul W. Brown1993-12-01Journal of the American Ceramic Society
Hydration reactions of C 3 A and C 4 AF with calcium sulfate hemihydrate and gypsum were investigated and the kinetics of the reactions compared. The rates of C 3 A and C 4 AF hydration, as determined by heat evolution, vary depending on whether the sulfate‐containing reactant is gypsum or calcium sulfate hemihydrate.…
Ferroelectric and Piezoelectric MaterialsMultiferroics and related materialsNuclear materials and radiation effects
Edgardo Paez-Mozo、Nyole Gabriunas、Fabio Lucaccioni 等 8 位作者1993-12-01The Journal of Physical Chemistry
Cobalt phthalocyanine was synthesized within the cavities of Y zeolites and was characterized in all the steps of the synthesis and purification procedures by elemental analysis, Fourier transform infrared spectroscopy, UV-visible spectroscopy, X-ray photoelectron spectroscopy, surface analysis, thermogravimetric anal…
Porphyrin and Phthalocyanine ChemistryPhotochemistry and Electron Transfer StudiesElectrochemical Analysis and Applications
J. Tao、N.W. Cheung、Chenming Hu1993-12-01IEEE Electron Device Letters
The AC electromigration lifetime, without DC component, has been studied in a wide frequency range (mHz to 200 MHz) and found to be linearly proportional to the repetition frequency of the AC stressing current. This behavior is observed in both of the metallization systems (Al-2% Si and Cu) investigated. This provides…
Semiconductor materials and devicesCopper Interconnects and ReliabilitySemiconductor materials and interfaces
Hiroshi Kumagai、K. Toyoda、Masahiko Matsumoto 等 4 位作者1993-12-01Japanese Journal of Applied Physics
We compared the use of nitrous oxide (N 2 O) and hydrogen peroxide (H 2 O 2 ) as the oxidant in digital chemical vapor deposition to obtain high-quality optical crystalline thin films of Al 2 O 3 . Optical constants and thicknesses of these films were investigated in terms of growth temperature, by using variable-angl…
Thin-Film Transistor TechnologiesNonlinear Optical Materials ResearchOptical Coatings and Gratings
G. Shirane、R. A. Cowley、Masaaki Matsuda 等 4 位作者1993-12-01Physical review. B, Condensed matter
The recent discovery, by high-resolution x-ray-diffraction measurements, of two length scales in ${\mathrm{SrTiO}}_{3}$ motivated a reinvestigation by neutron scattering of the soft phonon and associated central peak above the zone-boundary structural-phase-transition temperature (${\mathit{T}}_{\mathit{c}}$=99.5 K).…
Ferroelectric and Piezoelectric MaterialsHigh-pressure geophysics and materialsElectronic and Structural Properties of Oxides
Michael J. Michalczyk、W. E. Farneth、A. Vega1993-12-01Chemistry of Materials
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTHigh temperature stabilization of crosslinked siloxanes glassesM. J. Michalczyk, W. E. Farneth, and A. J. VegaCite this: Chem. Mater. 1993, 5, 12, 1687–1689Publication Date (Print):December 1, 1993Publication History Published online1 May 2002Published inissue 1 December 199…
Glass properties and applicationsSilicone and Siloxane ChemistryStructural Analysis of Composite Materials
J. P. Canselier1993-12-01Journal of Dispersion Science and Technology
Crystallization phenomena and processes may be greatly affected by the addition of surfactants, which play an important rote in nucleation and growth kinetics and can substantially modify both habit and size distribution of crystal products. Moreover, scaling in industrial equipments and caking in storage tanks can be…
Calcium Carbonate Crystallization and InhibitionMinerals Flotation and Separation TechniquesCrystallization and Solubility Studies
Dan J. Durben、Paul F. McMillan、George H. Wolf1993-12-01American Mineralogist
The pressure dependence of the vibrational modes of forsterite (Mg2SiO4) crystal and glass were measured to 50 GPa at 298 K with Raman spectroscopy. Raman bands of crystalline forsterite persist to 50 GPa. Two new Raman bands appear above 30 GPa. On decompression the new bands are retained to 8 GPa. The spectral chang…
Geological and Geochemical AnalysisHigh-pressure geophysics and materialsGlass properties and applications
B. Scott Jaynes、Craig L. Hill1993-12-01Journal of the American Chemical Society
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTSelective ethylation and vinylation of alkanes via polyoxotungstate photocatalyzed radical addition reactionsB. Scott Jaynes and Craig L. HillCite this: J. Am. Chem. Soc. 1993, 115, 25, 12212–12213Publication Date (Print):December 1, 1993Publication History Published online1…
Radical Photochemical ReactionsPolyoxometalates: Synthesis and ApplicationsSulfur-Based Synthesis Techniques