Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Formation of monodispersed colloidal particles is a complex process: nuclei, produced rapidly in a supersaturated solution, grow to nanosize primary particles, which then aggregate (coagulate) to form much larger final colloids. This paper reviews a kinetic model that explains the formation of dispersions of narrow si…
Recent spectroscopic results in the emerging area of transition-metal NIR-to-visible upconversion are related. The examples of Ti(2+)-, Re(4+)-, and Os(4+)-doped materials showing upconversion illustrate GSA/ESA, GSA/ETU, and photon avalanche multiphoton excitation mechanisms, respectively. Strategies for manipulation…
The thermal expansion coefficients of $\mathrm{Na}_{N}$ clusters with $8 \le N \le 40$ and $\mathrm{Al}_{7}$, $\mathrm{Al}_{13}^-$ and $\mathrm{Al}_{14}^-$ are obtained from {\it ab initio} Born-Oppenheimer LDA molecular dynamics. Thermal expansion of small metal clusters is considerably larger than that in the bulk a…
Many systems where interactions compete with each other or with constraints are well described by a model first introduced by Brazovskii. Such systems include block copolymers, alloys with modulated phases, Rayleigh-Benard Cells and type-I superconductors. The hallmark of this model is that the fluctuation spectrum is…
We study metallization of molecular hydrogen under pressure using exact exchange (EXX) Kohn-Sham density-functional theory in order to avoid well-known underestimates of band gaps associated with standard local-density or generalized-gradient approximations. Compared with the standard methods, the EXX approach leads t…
The ferrodistortive phase transition in the bis-tetramethylammonium tetrabromide crystals below room temperature is studied within the framework of the Landau theory. The specific heats of [N(CH3)4]2MnBr4 and [N(CH3)4]2ZnBr4 are correctly described down to 40°C below the transition temperature. The phenomenological pa…
The usual tiling problem determines which polygons can be used to cover the plane exactly without overlaps or gaps. We consider two variations of that problem. The first attempts to determine polygons that can tile the plane by reflections as in a kaleidoscope. The second determines polygons that can be used to create…
Article Entwicklung eines elektrolytischen Ätzverfahrens zur Charakterisierung der Magnesiumlegierung AZ 91 hp für den Thixogießprozess / The Development of an Electrolytic Etching Process for Examining the Microstructure of Thixocast Magnesium Alloy AZ91 hp was published on March 1, 2000 in the journal Practical Meta…
Magnetic field analysis of a permanent magnet put in free space can be effectively performed by a boundary‐integral technique completed with an iterative procedure following a non‐linear magnetic curve of magnetic material. The general idea of the boundary‐integral model of the permanent magnet is presented, the itera…
Monoesters of itaconic acid (monobutyl itaconate and monocyclohexyl itaconate) were synthesized and used as monomers. Poly(monobutyl itaconate) (PMBI) and poly(monocyclohexyl itaconate) (PMCHI) were prepared by free radical polymerization of these monomers using tert-butyl hydroperoxide as initiator. Subsequently, ABA…
An approximation formula of buildup factor for two-layer shields proposed previously was improved to fitting to the newly calculated buildup factors for point isotropic source gamma-rays of 0.1, 0.3, 0.6, 1,3,6 and 10 MeV penetrating two-layer shields combinations of water, iron or lead materials with the Monte Carlo…
New powder X-ray diffraction data of Ca 12 Al 14 O 32 F 2 (C11A7f), a cementitious compound, were collected on a conventional X-ray powder diffractometer; the cubic cell parameter is a =11.96269(6) Å, volume 1711.93(2) Å 3 (space group I -43 d (No. 220)). The strongest lines are 4.887(100), 2.676(95), 2.992(46), 2.443…
A gap streaming experiment was performed by using a D-T neutron source at FNS/JAERI as the ITER/EDA R&D Task T-218, in order to examine the streaming effects due to gap between shield blanket modules in ITER. The experiment had three phases. The first one defined neutron source characteristics (Source Characterization…
X-ray photoelectron spectroscopy and x-ray excited Auger electron spectroscopy have been used to investigate the electronic core levels of mercury chalcogenophosphate HgPS3 and HgPSe3 single crystals. On the basis of the measured chemical shifts relative to the elements information on the bonding state of the composit…
Effects of hydrodynamic interactions in the formation of lamellar patterns in thin block copolymer films are studied. We derive the phase diffusion equation, and the stability analysis reveals the development of the skewed-varicose instability. Moreover, we predict by means of numerical simulations that the hydrodynam…
The hydrothermal processing conditions of strontium tungstate powders were studied by using a thermodynamic model of electrolytic solutions in order to avoid the empirical trial-and-error mode of synthesis. The approach used makes possible to predict the optimum conditions through stability and yield diagrams, relatin…
Dipolar interaction between the metal ion and proximate water molecules represents an efficient mechanism for solvent relaxation in Gd3+ complexes currently employed as MRI contrast agents. Besides inner sphere (metal bound) and outer sphere hydration molecules, a well-defined second coordination shell may provide an…
Article Crystal structure of distrontium lanthanum gallium pentaoxide, Sr2LaGaO5 was published on March 1, 2000 in the journal Zeitschrift für Kristallographie - New Crystal Structures (volume 215, issue 3).
X-ray diffraction and thermomechanical analysis have been used, respectively, to examine structural order and shrinkage behaviour for oriented samples of rigid and flexible poly(vinyl chloride) (PVC). Results were compared with previously measured tensile properties and structure–property relationships explored. X-ray…
Tungsten bronze Sr0.5Ba0.5Nb2O6 nano-powders and thin films on platinum, Si(100), and sapphire substrates were prepared by the sol-gel route and characterized by x-ray diffraction and micro-Raman scattering techniques. The transparent and crack-free films crystallized into an orthorhombic phase at 700°C. Annealing of…