Volker Buddensiek、H. Engel、S. Fleischauer-Rössing 等 5 位作者1990-07-20Archiv für Hydrobiologie
Dans le cadre d'etude des sediments de l'habitat des bivalves dulcaquicoles, une technique d'echantillonnage des eaux interstitielles, primitivement decrite pour les lits rocheux d'eaux courantes par Husmann, a ete modifiee pour une utilisation a long terme dans les sables et graviers d'eaux courantes ou stagnantes.La…
Wastewater Treatment and Nitrogen RemovalDiatoms and Algae ResearchIntegrated Water Resources Management
Rachid Benchrifa、M. Leblanc、R. De Pape1990-07-17ChemInform
Abstract The hydrothermal treatment of an (NH4)2O/MoO3 mixture at 200 °C (teflon autoclave) yields (NH 4 ) 2 Mo 2 O 7 , (NH 4 ) 8 Mo 10 O 34 and the title compound (NH 4 ) 2 Mo 4 O 13 (I).
Metal-Organic Frameworks: Synthesis and ApplicationsPolyoxometalates: Synthesis and ApplicationsChemical Synthesis and Characterization
Elias Lolis、Tom Alber、R. Davenport 等 6 位作者1990-07-17Biochemistry
The structure of yeast triosephosphate isomerase (TIM) has been solved at 3.0-A resolution and refined at 1.9-A resolution to an R factor of 21.0%. The final model consists of all non-hydrogen atoms in the polypeptide chain and 119 water molecules, a number of which are found in the interior of the protein. The struct…
Protein Structure and DynamicsEnzyme Structure and FunctionErythrocyte Function and Pathophysiology
А. А. Каминский、B. V. Mill、А. В. Буташин 等 5 位作者1990-07-16physica status solidi (a)
Crystallization conditions are found and Czochralski method is used for the first time for growing single crystals of the trigonal acentric La3Ga5SiO14 compound with Ln3+ ions (Ln3+ = Pr3+, Ho3+, and Er3+). The behaviour of the Ln3+ activators in the grown disordered crystals is studied by analyzing the results of con…
Luminescence Properties of Advanced MaterialsPhotorefractive and Nonlinear OpticsSolid State Laser Technologies
M. Molotskii、С. З. Шмурак1990-07-16physica status solidi (a)
Results are given of experimental and theoretical investigations of electron emission, observed under plastic deformation of colored alkali halide crystals. The emission is shown to be due to Auger process by the electrons pushed out of the surface from F-centres by dislocation. A comparison of theory and experiment p…
Electron and X-Ray Spectroscopy TechniquesX-ray Diffraction in CrystallographySurface and Thin Film Phenomena
G. J. Zhang、Takeshi Kinoshita、Keiji Sasaki 等 5 位作者1990-07-16Applied Physics Letters
A new type of chalcone crystal was prepared. Anisotropic indices with wavelength dispersion were measured by the Brewster angle method. The two largest second-harmonic generation (SHG) tensor components were determined by the wedge method and compared with d11 of 2-methyl-4-nitroaniline. Calculated collinear and nonco…
Nonlinear Optical Materials ResearchPhotochemistry and Electron Transfer StudiesSpectroscopy and Quantum Chemical Studies
Armando C. Gonzalez、C. G. Pantano1990-07-16Applied Physics Letters
The phenomenon termed fractoemission was monitored in soda-lime-silica glass specimens during slow crack growth. No electron, ion, or photon signals were detected until crack velocities reached approximately 10−2 m/s. These observations suggest that the more intense fractoemissions observed during fast fracture are du…
Glass properties and applicationsBuilding materials and conservationStructural Analysis of Composite Materials
J. von Cieminski、H.Th. Langhammer、Hans‐Peter Abicht1990-07-16physica status solidi (a)
Investigations of the electromechanical properties of BTS-ceramics show unusual strain-field curves and extraordinary high weak-signal electrostrictive R coefficients. In the process of selecting two examples (BTS-10 and BTS-13) it is illustrated that the strain-field curves differ significantly from those of lead per…
Ferroelectric and Piezoelectric MaterialsMicrowave Dielectric Ceramics SynthesisDielectric properties of ceramics
Е. П. Найден、V. I. Mal'tsev、G. I. Ryabtsev1990-07-16physica status solidi (a)
A neutronographic study is made of magnetic structure and spin-orientational transitions in polycrystalline samples of the system BaCo2−xZnxFe16O27 (Co2−xZnxW). Along with this studies measurements of the macroscopic magnetic characteristics, X-ray dilatometry, and DTA are performed. The diagram of the magnetic state…
Multiferroics and related materialsMagnetic Properties and Synthesis of FerritesIron oxide chemistry and applications
B. S. Berry、W. C. Pritchet、J. J. Cuomo 等 5 位作者1990-07-16Applied Physics Letters
The internal tensile stress in polycrystalline diamond films deposited on silicon substrates has been measured from 100 to 700 K by a vibrating-membrane method. The stress increases strongly with temperature, in a manner consistent with the elastic accommodation of the differential thermal strain between diamond and s…
Metal and Thin Film MechanicsHigh-pressure geophysics and materialsDiamond and Carbon-based Materials Research
R. S. Kwok、G. Grüner、S. E. Brown1990-07-16Physical Review Letters
We present results on the resistivity \ensuremath{\rho}, specific heat ${\mathit{C}}_{\mathit{p}}$, and susceptibility \ensuremath{\chi} of ${\mathrm{K}}_{0.3}$${\mathrm{MoO}}_{3}$ near the Peierls transition ${\mathit{T}}_{\mathit{p}}$ at 180 K. Our resistivity measurements demonstrate that fluctuations intrinsic to…
Physics of Superconductivity and MagnetismMagnetism in coordination complexesOrganic and Molecular Conductors Research
M.S. Weiss、Tobias Wacker、J. Weckesser 等 5 位作者1990-07-16FEBS Letters
The crystal structure of porin from Rhodobacter capsulatus strain 37b4 has been solved at 3.0 A (1 A = 0.1 nm) resolution by multiple isomorphous replacement and solvent-flattening. The three pores of the trimer are well defined in the electron density map. Each pore consists of a 16-stranded beta-barrel which travers…
Bacterial Genetics and BiotechnologyAdvanced Electron Microscopy Techniques and ApplicationsEnzyme Structure and Function
Yukio TOMITA、A. Shima、K. Sato1990-07-16Applied Physics Letters
Two bubbles are simultaneously generated in water by focusing a Q-switched ruby laser. The dynamic behavior of the induced bubbles is investigated by means of high-speed photography. Consequently it is found that the bubble–bubble interaction is significantly influenced not only by the relative size of bubbles but als…
Ultrasound and Cavitation PhenomenaLaser-Ablation Synthesis of Nanoparticles
J. R. Bellingham、W. A. Phillips、C. J. Adkins1990-07-16Journal of Physics Condensed Matter
The authors present a detailed analysis of the electrical and optical properties of amorphous transparent conducting thin films of indium oxide prepared by ion beam sputtering with a wide range of carrier concentrations. They show that the resistivity is dominated by ionised impurity scattering despite the amorphous s…
ZnO doping and propertiesThin-Film Transistor TechnologiesElectronic and Structural Properties of Oxides
Andrew J. Golder、David C. Povey、Jack Silver 等 4 位作者1990-07-15Acta Crystallographica Section C Crystal Structure Communications
[Zn(C 44 H 28 N 4 )(H 2 O)] cristallise dans I4/m avec a=13,425, c=9,6994 A, Z=2; affinement jusqu'a R=0,043. Cette structure a ete reetudiee afin de mesurer, avec plus de precision, le deplacement du zinc par rapport au plan de la porphine. Ainsi, ce deplacement est de 0,173 A. Le zinc n'est coordine qu'a une seule m…
Molecular Sensors and Ion DetectionPorphyrin and Phthalocyanine ChemistryAnalytical Chemistry and Chromatography
L. Dobrzyński、C. Petrillo、F. Sacchetti1990-07-15Physical review. B, Condensed matter
The magnetic structure factors determined using polarized neutron scattering are employed to analyze the magnetic-moment distribution of Fe in ${\mathrm{Fe}}_{3}$(${\mathrm{Al}}_{\mathit{x}}$${\mathrm{Si}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$) alloys. The spherical and aspherical parts of the distributions are not mu…
Magnetic properties of thin filmsMagnetic Properties and ApplicationsMagnetic Properties of Alloys
Nobuo Ueno、Kazuyuki Sugita1990-07-15Physical review. B, Condensed matter
Low-energy electron transmission experiments were performed for two types of amorphous films (solid amorphous and molten amorphous films) of tetratetracontane [${\mathrm{CH}}_{3}$(${\mathrm{CH}}_{2}$${)}_{42}$${\mathrm{CH}}_{3}$]. The temperature dependence of the transmission spectra and the spectral changes due to t…
Semiconductor materials and devicesAdvanced Electron Microscopy Techniques and ApplicationsElectron and X-Ray Spectroscopy Techniques
S.W.S. McKeever1990-07-15Journal of Applied Physics
The concept of competition-during-heating as a mechanism for TL supralinearity and sensitization in TLD-100 is re-examined. It is demonstrated that with this model it is not necessary that the competing traps be removed by radiation in order for supralinearity to be obtained. Furthermore, the arguments for and against…
Luminescence Properties of Advanced MaterialsNonlinear Optical Materials ResearchSolid-state spectroscopy and crystallography
Ken‐ichi Onisawa、M. Fuyama、Katsumi Tamura 等 6 位作者1990-07-15Journal of Applied Physics
Yttrium oxide (Y2O3) thin films were deposited on indium-tin-oxide(ITO)-coated glass substrates by the radio-frequency-sputtering method using an Y2O3-sintered target. The relative dielectric constant εr and the dielectric strength EBD of the Y2O3 films were studied. It was found that εr and EBD have a maximum value a…
Advanced ceramic materials synthesisAcoustic Wave Resonator TechnologiesGa2O3 and related materials
Seongbok Lee、D. M. Bylander、Leonard Kleinman1990-07-15Physical review. B, Condensed matter
Using an expansion of \ensuremath{\sim}2870 plane waves, we have performed ab initio calculations of the energy bands, equilibrium lattice constants and atomic positions, and cohesive energy of ${\mathrm{B}}_{12}$. We find an indirect gap of 1.427 eV and a direct gap of 1.780 eV. The lattice constants and atomic posit…
High-pressure geophysics and materialsBoron and Carbon Nanomaterials ResearchSuperconductivity in MgB2 and Alloys