Dan Sykes、James D. Kubicki、Thomas C. Farrar1997-04-01The Journal of Physical Chemistry A
The basis set dependency of Al and Si isotropic chemical shieldings in Al 3+ ·6(H 2 O), [Al(OH) 4 ] 1- ·2(H 2 O), and tetramethylsilane have been calculated using the GIAO formalism. The Si chemical shielding changes substantially with the addition of extra d-functions; however, this influence is smaller than the effe…
Glass properties and applicationsAdvanced NMR Techniques and ApplicationsSolid-state spectroscopy and crystallography
Atsushi Shishido、Osamu Tsutsumi、Akihiko Kanazawa 等 6 位作者1997-04-01The Journal of Physical Chemistry B
Photochemical phase transition behavior of photochromic azobenzene liquid crystals (LCs) was explored by means of reflection-mode analysis. On pulse irradiation at 355 nm, which causes trans − cis isomerization of the azobenzene moiety, these LCs underwent nematic (N) to isotropic (I) phase transition in 100 μs as pro…
Liquid Crystal Research AdvancementsPhotochromic and Fluorescence ChemistryMolecular spectroscopy and chirality
V. V. Lemanov、Е. П. Смирнова、E. A. Tarakanov1997-04-01Physics of the Solid State
Dielectric properties of ceramic samples of Sr 1− x Pb x TiO 3 solid solutions for x varying from 0 to 0.3 have been studied. The ferroelectric phase transition in this system has been established to persist down to x =0.005. Within the x values of 0.002 to 0.05, the ferroelectric transition temperature is shown to fo…
Ferroelectric and Piezoelectric MaterialsMaterial Dynamics and PropertiesGlass properties and applications
Warren E. Pickett、David J. Singh1997-04-01Physical review. B, Condensed matter
Disorder broadening due to randomly distributed ${\mathrm{La}}^{3+}$ and ${\mathrm{A}}^{2+}$ (A=Ca,Sr,Ba) cations is combined with a virtual-crystal treatment of the average system to evaluate the effects on both majority and minority transport in the ferromagnetic ${\mathrm{La}}_{2\mathrm{/}3}$${\mathrm{A}}_{1\mathrm…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsElectronic and Structural Properties of Oxides
M. Pissas、G. Kallias、E. Devlin 等 5 位作者1997-04-01Journal of Applied Physics
A thorough study of the M{umlt o}ssbauer spectra (MS) of a lightly iron doped (2{percent}) polycrystalline La{sub 0.75}Ca{sub 0.25}MnO{sub 3} compound has been carried out from T=4.2 K up to 300 K. The MS for T{gt}T{sub c} and at T=4.2 K show one component. The corresponding hyperfine parameters are compatible with S=…
High-pressure geophysics and materialsMagnetic and transport properties of perovskites and related materialsRare-earth and actinide compounds
A. G. Lebed、N. N. Bagmet1997-04-01Physical review. B, Condensed matter
We demonstrate that transverse magnetoresistance is a nonanalytical function of the magnetic field, ${\mathrm{\ensuremath{\rho}}}_{\mathrm{\ensuremath{\perp}}}$(H)\ensuremath{\sim}|H${\mathrm{|}}^{1\mathrm{/}2}$, if a magnetic field is parallel to the plane of anisotropy and normal to the Fermi surface at an inflectio…
Magnetism in coordination complexesMolecular Junctions and NanostructuresOrganic and Molecular Conductors Research
Michaël Slany、M. Bardají、Anne‐Marie Caminade 等 5 位作者1997-04-01Inorganic Chemistry
The synthesis of phosphino-terminated dendrimers is described up to the tenth generation, which possess more than 3000 phosphino groups (3-[G'(10)()]). Several complexation reactions of these dendrimers toward various low oxidation states transition metal derivatives have been carried out, up to generation 5 for iron…
RNA Interference and Gene DeliveryLuminescence and Fluorescent MaterialsDendrimers and Hyperbranched Polymers
Kenji Funatsu、Akira Kimura、Taira Imamura 等 5 位作者1997-04-01Inorganic Chemistry
A series of ruthenium(II) porphyrin dimers and trimers (carbonyl dimers, 1-4; carbonyl trimers, 5-7, bis(pyridyl) trimers, 8-10), having axial or bridging porphyrin ligands, were synthesized and characterized by (1)H NMR and IR spectroscopy and mass spectrometry. An X-ray structural determination of Ru(II)(OEP)(CO)(H(…
Magnetism in coordination complexesPorphyrin and Phthalocyanine ChemistryMetal-Catalyzed Oxygenation Mechanisms
Xiang Tong Li、Dong He Pei、Shunsuke Kobayashi 等 4 位作者1997-04-01Japanese Journal of Applied Physics
The photopolymer material of poly(vinyl cinnamate) (PVCi) has been used to investigate the contribution of the anisotropic van der Waals force to the azimuthal anchoring energy in a pentyl cyanobiphenyl (5CB)/PVCi system. The optical anisotropy of a PVCi film is precisely controlled by varying the exposure time of lin…
Liquid Crystal Research AdvancementsPhotochemistry and Electron Transfer StudiesPhotochromic and Fluorescence Chemistry
P. D. Battle、D. E. Cox、M. A. Green 等 8 位作者1997-04-01Chemistry of Materials
Neutron and synchrotron X-ray powder diffraction techniques have been used to refine the crystal and magnetic structures of the n = 2 Ruddlesden−Popper (RP) system Sr 2 LaMn 2 O 7 . The sample is shown to be biphasic, although both phases are of the RP type and have similar structural parameters. The majority phase (8…
Magnetic and transport properties of perovskites and related materialsMultiferroics and related materialsAdvanced Condensed Matter Physics
Janet A.W. Elliott、C. A. Ward1997-04-01The Journal of Chemical Physics
The equation traditionally used to interpret temperature programmed desorption (TPD) spectra, the Polanyi–Wigner equation, does not contain explicitly the coverage and temperature dependence necessary to predict TPD spectra in several important systems including CO–Ni(111). Herein, the statistical rate theory (SRT) ap…
Catalytic Processes in Materials ScienceElectrochemical Analysis and ApplicationsCatalysis and Oxidation Reactions
Iwao Okazaki、Bernhard Wunderlich1997-04-01Macromolecular Rapid Communications
Abstract The melting of poly(ethylene terephthalate) is analyzed by quasi‐isothermal, temperature‐modulated differential scanning calorimetry. The measurement is done by sinusoidally changing the temperature in the melting range (± 1.0 K). In the melting range a small portion of the sample melts reversibly. This obser…
Polymer crystallization and propertiesbiodegradable polymer synthesis and propertiesMicroplastics and Plastic Pollution
Andréa Prosperetti1997-04-01The Journal of the Acoustical Society of America
It is argued that a pulsating acoustically levitated bubble cannot possibly maintain a spherical shape. A jet forms during compression, and the sound amplitude such that the jet first strikes the other side of the bubble with sufficient energy is hypothesized to be the threshold for sonoluminescence. It is proposed th…
Microfluidic and Bio-sensing TechnologiesUltrasound and Cavitation Phenomena
Ming Wu、John SantaLucia、Douglas H. Turner1997-04-01Biochemistry
The three-dimensional solution structure of the RNA self-complementary duplex [formula in text] was derived from two-dimensional NMR and the iterative relaxation matrix approach. Each GA mismatch forms two hydrogen bonds: A-NH6 to G-O6 and A-N1 to G-NH1 (imino). This GA structure differs from the sheared tandem GA str…
Magnetism in coordination complexesElectron Spin Resonance StudiesMolecular spectroscopy and chirality
J. Richard Booth、Deb Bhattacharjee1997-04-01Journal of Thermal Insulation and Building Envelopes
Monitoring thermal conductivity changes in thin-sliced cellular plastics has drastically reduced the time required to evaluate the long-term aging of insulating foams. Monitoring the weight changes of closed-cell thin-slices provides data which can be analyzed to determine the effective diffusivity of atmospheric and…
Polymer Foaming and Composites
Barbara L. Sherriff、E. V. Sokolova、Janice Cramer 等 6 位作者1997-04-01American Mineralogist
Other| April 01, 1997 Changes in the crystal structure of tsaregorodtsevite [N(CH3)4 ][Si2 (S0.5 Al0.5)O6 ]2 on heating Barbara L. Sherriff; Barbara L. Sherriff University of Manitoba, Department of Geological Sciences, Canada Search for other works by this author on: GSW Google Scholar Elena V. Sokolova; Elena V. Sok…
Zeolite Catalysis and SynthesisCrystal Structures and PropertiesRadioactive element chemistry and processing
R. C. Ormerod、H. A. Becker、E. W. Grandmaison 等 5 位作者1997-04-01The Canadian Journal of Chemical Engineering
Abstract Variables affecting the high temperature oxidation of steel were investigated using an experimental design strategy. The experimental methods included continuous mass‐gain measurement to characterize the oxidation kinetics in terms of parabolic rate constants. A Morris and Mitchell (1983) eleven‐run experimen…
High-Temperature Coating BehaviorsMetallurgical Processes and ThermodynamicsThermal and Kinetic Analysis
H.J. Brede、O. Hecker、R. Hollnagel1997-04-01Radiation Protection Dosimetry
An experimental set-up is described which allows the calorimetric determination of the heat defect of solids and fluids relative to that of gilded copper which is used as the reference material. The calorimeter operates in a quasi-adiabatic mode and is suitable for protons, deuterons, alpha particles and other heavy i…
Nuclear Physics and ApplicationsGraphite, nuclear technology, radiation studiesNuclear and radioactivity studies
R.J. Iwanowski、Janusz W. Sobczak、Ż. Kaliński1997-04-01Acta Physica Polonica A
X-ray photoelectron spectra of core levels are reported for InP:Yb. Crystalline InP, doped with Yb to a level of 0.5 at.%, was grown by the synthesized solute diffusion method. An analysis of the core-level spectra of the constituent components, i.e. In 3d512 and P 2p, revealed a minor influence of the surface oxide s…
Semiconductor materials and devicesElectron and X-Ray Spectroscopy TechniquesIon-surface interactions and analysis
Yoshiyuki Sano、Chan Woo Lee、Yoshiharu Kimura 等 4 位作者1997-04-01Die Angewandte Makromolekulare Chemie
Abstract Copoly(amide‐ethers) containing two types of tertiary amine units were made as antistatic modifiers for poly(ethylene terephthalate) (PET) fibers. The filaments of the copolymers were melt‐spun and reacted with three alkylating agents in order to quaternize the tertiary amine into a sulfo‐betaine, a carbobeta…
biodegradable polymer synthesis and propertiesSynthesis and properties of polymersBiopolymer Synthesis and Applications