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81.
Salvador Antonio Palomares-Sánchez Yuri M. Chumakov Selina Ponce-Castañeda Bernard E. Watts Fabrizio Leccabue Gabrielle Bocelli 《Journal of Materials Science》2007,42(20):8690-8694
The binary oxide AlVO4 is being proposed as a new gas sensor material. An X-ray investigation, IR spectrum analysis, resistivity and a calculation
of the electronic structure of this compound have been carried out in order to determine its structural, absorptive and sensor
properties. The fragment [Al3V3O23]18− is the chain chosen to study the electronic properties of AlVO4 in the framework of the frontier orbital theory and the interaction between molecules has been described by the Molecular
Electrostatic Potential (MEP). The vibration analysis and the simulated infrared spectrum (IR) were calculated for the unit
[Al3V3O23]18− and a comparative analysis with the experimental spectrum of AlVO4 is also presented. 相似文献
82.
XRD has been applied to component interaction in the Nd ― Re ― B system. Isothermal sections have been constructed for the phase diagram at 600°C (a region >33 at.% boron) and 800°C (>33 at.% boron). It is confirmed that it contains the previously known borides Nd2Re3B6 (Pr2Re3B6 structure type) and Nd8Re13 − x B12 (Pr8Re13 − x B12 structure type). Two new ternary compounds are reported: ∼NdRe4B4 considered to have a tetragonal incommensurate structure and ∼Nd5Re2B6, whose structure is unknown.
相似文献83.
V. V. Belyakov A. I. Chumakov A. Y. Nikiforov V. S. Pershenkov P. K. Skorobogatov A. V. Sogoyan 《Microelectronics Reliability》2000,40(12):465
The approach for IC's radiation hardness estimation and fault prediction is presented in this paper. It is based on the implementation of low-energy laboratory simulation sources (laser, X-ray, etc.). The possibility of radiation simulator application is based on similarity of physical processes in semiconductor structures causing IC upsets and failures under the radiation environment and under simulation sources. The analysis of adequacy is performed for total dose effects, single event effects, displacement effects and transient radiation effects. The application of imitators permits to change the expensive and low-productive radiation test installations with much more effective simulation sources, based on the dominant effects equivalence. The designed simulation test methods are proved to be an effective tool to different IC radiation hardness estimation and fault prediction in radiation environment. 相似文献
84.
85.
Singularities of measurement of pulsation characteristics in nonisothermal flows with a high degree of turbulence are discussed.
A modification of the hot-wire anemometer method of velocity measurement for similar flows is suggested. The results are given
of measurements of different characteristics of pulsation motion in the free-convection boundary layer forming along a heated
vertical surface. 相似文献
86.
Chemical and Petroleum Engineering - 相似文献
87.
Here we present a novel technique for the preparation of thin, transparent and conducting, nanotube containing layers at the surface of commercially available polyethylene films. This is achieved by the swelling of the polyethylene in nanotube/tetrahydrofuran dispersions, followed by nanotube infiltration. These layers, typically 250 nm thick, display conductivities of up to 66 S/m, depending on the nanotube content. This results in sheet resistances of as low as 50 kΩ/□ at optical transparencies of 80%. 相似文献
88.
In the present paper we have derived the analytical expressions for the modes of twisted elliptical fibers with torsional mechanical stress at various relationships of the fiber parameters. It was shown that circularly polarized optical vortices with the topological charges ±1 can propagate in elliptical fibers as generic modes if ellipticity and the twist-induced circular birefringence suppress the spin-orbit interaction. A comparison of the obtained results with the corresponding results for spun elliptical fibers is made. 相似文献
89.
N. P. Chumakov V. N. Varyukhin N. N. Talalueva 《Refractories and Industrial Ceramics》1999,40(9-10):406-408
A process for fabricating clay tile by hydrostatic treatment and a device for its production are described. The suggested technology is distinguished from existing ones by an elevated and uniform density of the tile, which improves the quality of the product and makes it possible to decrease its thickness while retaining the requisite service parameters, and it makes the use of all drying equipment unnecessary and reduces the firing temperature. Implementation of the new technology makes it possible to widen the range of products and use lean low-plasticity clays. 相似文献
90.
Results are given of experimental investigations of air flow in the vicinity of a vertical plate under stepwise heating which
leads to inversion of heat flux on the surface. It is suggested to generalize to this case the algebraic model of turbulent
thermal diffusivity developed by us previously. The results of calculations of such flow are compared with experimental data,
and special features of the structure of thermal layer are identified. 相似文献