R. James Kirkpatrick、Ping Yu、Xiaoqiang Hou 等 4 位作者1999-08-01American Mineralogist
The 35 Cl NMR spectroscopy of Cl - -intercalated hydrotalcite and the Ca-aluminate hydrate hydrocalumite (Friedel’s salt) demonstrates dynamical behavior of interlayer Cl - , the presence of dynamical order-disorder phase transitions in these phases, and significant differences in the transition temperatures and tempe…
Mesoporous Materials and CatalysisClay minerals and soil interactionsLayered Double Hydroxides Synthesis and Applications
Taichi Okuda、T. Kimura、Y. Tokura1999-08-01Physical review. B, Condensed matter
Low-temperature magnetotransport properties have been investigated for a single crystal of ${\mathrm{La}}_{1.3}{\mathrm{Sr}}_{1.7}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7}$ with a bilayered structure to reveal the ground-state nature of the quasi-two-dimensional ferromagnetic state. The specific heat measured in a magnetic fi…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsAdvanced Condensed Matter Physics
J. Rodrı́guez、A. Martín、J.Y. Pastor 等 6 位作者1999-08-01Journal of the American Ceramic Society
The wear resistance of four Al 2 O 3 /SiC nanocomposites that contained SiC particles of varying average size (40, 200, and 800 nm) was studied under dry sliding conditions and compared with the results obtained in unreinforced alumina. The wear rate of the alumina and the nanocomposites of equivalent grain size incre…
Advanced ceramic materials synthesisAluminum Alloys Composites PropertiesAdvanced materials and composites
Tomoo Akizuki、Kouichi Miyachi、Yoichi Takanishi 等 6 位作者1999-08-01Japanese Journal of Applied Physics
The helical pitch and the optical rotatory power (ORP) were measured in the subphases of an antiferroelectric liquid crystal. These measurements clearly indicate the existence of a macroscopic helical structure with a pitch of several microns. The selective reflection and ORP in several molecular orientational structu…
Liquid Crystal Research AdvancementsPlant Reproductive BiologyMolecular spectroscopy and chirality
Hiroyuki Nojiri、Koji Kaneko、M. Motokawa 等 6 位作者1999-08-01Physical review. B, Condensed matter
It was discovered in ${\mathrm{La}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(x\ensuremath{\sim}1/8)$ that a field-induced phase transition occurs from a ferromagnetic metal (FM) phase to a ferromagnetic insulator (FI) phase. The magnetization shows a sharp jump at the transition field accompanied by a…
Magnetic and transport properties of perovskites and related materialsRare-earth and actinide compoundsAdvanced Condensed Matter Physics
Kazuhiko Kuroki、Hideo Aoki1999-08-01Physical review. B, Condensed matter
The d-wave pairing correlations along with spin correlation are calculated with the quantum Monte Carlo method for the two-dimensional Hubbard model on lattice structures representing organic superconductors $\ensuremath{\kappa}\ensuremath{-}(\mathrm{BEDT}\ensuremath{-}\mathrm{TTF}{)}_{2}\mathrm{X}$ and $(\mathrm{TMTS…
Physics of Superconductivity and MagnetismMagnetism in coordination complexesOrganic and Molecular Conductors Research
V. Radmilović、R. Kilaas、U. Dahmen1999-08-01Microscopy and Microanalysis
Abstract The mechanical properties of Al-Cu-Mg alloys depend on a dispersion of Al2CuMg phase precipitates which form as laths along <100>A1, with {012}A1 as the habit plane. Despite extensive study, the crystal structure, morphology and interface structure between the Al2CuMg intermetallic phase and the Al matrix are…
Intermetallics and Advanced Alloy PropertiesMetallurgical and Alloy Processes
Kumar Rajesh、Hirotsugu Kikuchi、Martin Stärk 等 5 位作者1999-08-01Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals
Morphology of the liquid crystal/polymer composite has been investigated at the microscopic level as a model investigation in order to elucidate the nature of microscopic phase separation. It has been observed that the modification of surface interaction between liquid crystal and polymer is different for different sy…
Liquid Crystal Research AdvancementsSurfactants and Colloidal SystemsForce Microscopy Techniques and Applications
Mikhail N. Pivnenko、A. P. Fedoryako、L. A. Kutulya 等 4 位作者1999-08-01Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals
Dynamic properties of ferroelectric liquid crystals have been studied by means of observation of electric, optical and mechanical responses to the step-like change of electric field strength. A resonance low-frequency mode interpreted as a texture one has been revealed near the phase transition SmA - SmC*. Interaction…
Liquid Crystal Research AdvancementsMaterial Dynamics and PropertiesOptical Polarization and Ellipsometry
R. A. Lewis、John W. Goodby、Michael Hird 等 4 位作者1999-08-01Molecular crystals and liquid crystals science technology. Section A, Molecular crystals and liquid crystals/Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals
The synthesis and transition temperatures of a series of novel liquid crystalline quinolines is described. Palladium-catalysed coupling of arylboronic acids to 6-bromoquinolines is used to create 6-alkyl-2-arylquinolines in which the phenyl ring is fluorinated at the 2′ and 2′,3′-position. The fluoro-substituents give…
Liquid Crystal Research AdvancementsOrganic Light-Emitting Diodes ResearchSynthesis and Properties of Aromatic Compounds
Peter Baur、Jorg Schönherr、Ben Grayson1999-08-01Pesticide Science
Polydisperse ethoxylated fatty alcohol (EFA) surfactants can improve the performance of crop protection agents. At the cuticular level they act as accelerators of penetration by increasing the mobility of active ingredients in the cuticle, the barrier properties of which are mainly caused by cuticular waxes. Polydispe…
Bee Products Chemical AnalysisTextile materials and evaluations
O. Krause、Peter Dürichen、Christian Näther 等 4 位作者1999-08-01European Journal of Inorganic Chemistry
The new compounds K4Nb2S10O and Rb4Nb2S10O have been synthesized by the reaction of potassium or rubidium alkaline polychalcogenides with NbO2, Nb2O5, or mixtures of Nb and NbO. Their structures consist of discrete [Nb2Q11]4– anions (Q = O, S) built up of two face-sharing pentagonal bipyramids, which are connected via…
Magnetic and transport properties of perovskites and related materialsCrystal Structures and PropertiesInorganic Chemistry and Materials
Qingshan Zhu、Kazuhisa Shobu、Eiji Tani 等 5 位作者1999-08-01Journal of the American Ceramic Society
Molybdenum carbosilicide composites (SiC‐Mo ≤5 Si 3 C ≤1 ) were fabricated via the melt‐infiltration process. The fracture behavior of the composites was studied from room temperature up to 1800°C in 1 atm (∼10 5 Pa) of argon. The bend strength of the composites slightly increased at ∼1200°C, because of the brittle‐du…
Advanced ceramic materials synthesisMXene and MAX Phase MaterialsAdvanced materials and composites
Hidetoshi Fujii1999-08-01Science and Technology of Welding & Joining
To assist in selection of suitable wetting materials and control of wetting in various situations, previous results for ceramic–aluminium systems have been readdressed. Wetting systems can be categorised into three types (A, B, and C), characterised by original wettability and equilibrium wettability. In pure systems…
Mechanical Behavior of CompositesSurface Modification and SuperhydrophobicityFiber-reinforced polymer composites
Kil‐Yeong Choi、Mi Hie Yi1999-08-01Macromolecular Symposia
Abstract A series of novel aromatic diamines containing kinked cycloalkane structures between two phenyl rings were synthesized by HCl‐catalyzed condensation reaction of excess aniline and corresponding cycloalkanone derivatives. The structures of the diamines were indentified by 1 H NMR, 13 C NMR, FT‐IR spectroscopy…
Epoxy Resin Curing ProcessesSynthesis and properties of polymersTribology and Wear Analysis
L. Oster、Y.S. Horowitz、N. Issa1999-08-01Radiation Protection Dosimetry
The optical absorption (OA) and thermoluminescence (TL) or irradiated LiF:Mg,Ti was studied as a function of the temperature of post-irradiation annealing. The dose response of the OA bands and sensitisation effect were also investigated. The filling and emptying rate 'anti-correlation' and the behaviour with dose of…
Luminescence Properties of Advanced MaterialsRadiation Detection and Scintillator TechnologiesNuclear Physics and Applications
Jian‐Min Zuo1999-08-01Microscopy Research and Technique
The method for accurate structure refinement from energy-filtered convergent-beam electron diffraction (CBED) patterns is described with emphasis on recent progress in using imaging filters and 2-D detectors. Details are given about the underlying theoretical model and the statistical analysis of experimental data. Th…
Electronic and Structural Properties of OxidesX-ray Diffraction in CrystallographySurface and Thin Film Phenomena
V. G r me、D. Lapraz、P. Iacconi 等 6 位作者1999-08-01Radiation Protection Dosimetry
The thermostimulated luminescence (TSL) of powdered synthetic CaSO4 crystals is studied with various types of doping rare earth (RE3+) impurities: Dy3+, Tm3+, Ho3+, Er3+ or Gd3+. Fluorescence and optical diffuse reflectance data are presented. Valence changes of RE3+ are observed after X irradiation and/or thermal ann…
Luminescence Properties of Advanced MaterialsCrystal Structures and PropertiesSolid-state spectroscopy and crystallography
David C. Joy1999-08-01Microscopy and Microanalysis
Abstract The development of quantitative X-ray microanalysis in the 1950s spurred the need for knowledge of the many parameters which describe the electron interaction, such as the ionization cross-sections, fluorescent yields, the electron stopping power, mass absorption coefficients, and others. Although classical m…
X-ray Spectroscopy and Fluorescence AnalysisElectron and X-Ray Spectroscopy TechniquesAdvanced Materials Characterization Techniques
Noriyasu Mori、M. Morimoto、Kiyoji Nakamura1999-08-01Advanced Materials
An important feature of liquid crystal displays is surface alignment of the LCs. While mechanical rubbing has been used extensively to induce such alignment, this process also produces dust and static electricity. However, surface alignment in films of hydroxypropylcellulose has recently been achieved in situ during h…
Liquid Crystal Research AdvancementsAdvanced Cellulose Research StudiesPickering emulsions and particle stabilization