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排序方式: 共有178条查询结果,搜索用时 15 毫秒
1.
A. D. Bulanov A. N. Moiseev O. Yu. Troshin V. V. Balabanov D. V. Isaev 《Inorganic Materials》2004,40(6):555-557
High-purity isotopically enriched (99.98% 28Si, 99.57% 29Si, and 99.83% 30Si) silane samples are prepared for the first time. The total hydrocarbon content of the samples is no higher than 0.1–0.3 ppm. The concentration of electroactive impurities in the silicon prepared from the purified monoisotopic silane is below 1015 cm–3. 相似文献
2.
VladimirV.Primachenko ValeriyV.Martynenko 《中国耐火材料》2003,12(3):25-29
The article gives an introduction to the Ukrainian Research Institute of Refractories and especially its R D and refractory products for the industries of iron and steel,nonferrous,glass and chemistry etc. 相似文献
3.
4.
In this paper, a new model-based engineering approach is introduced by bridging MATLAB Simulink with IEC61499 Function Block models. This is achieved by a transformation between the two block-diagram languages. The transformation supported by the developed tools sets the cornerstone of the verification and validation framework for IEC 61499 Function Blocks in closed-loop with the models of the plant. The framework also paves the way to running distributed simulations of complex hybrid (i.e., continuous-discrete) closed-loop plant-controller systems and building complex models using the efficient object instantiation techniques of IEC 61499. 相似文献
5.
Glass Physics and Chemistry - The aim of this study is to establish the dependence of the mechanical strength of products with the geometry of the Schwarz P-surface on the number and size of unit... 相似文献
6.
O. S. Balabanov 《Cybernetics and Systems Analysis》2018,54(2):173-184
Several simple inequality constraints on correlations in a rhombus-like causal model (structured as a cycle with one collider) are formulated and proved. These constraints follow from the linearity and Markov properties of the model. The presented inequalities are specific to the basic model and are incorrect for alternative models that differ in Markov properties due to the presence of an additional edge (connection). The plausibility of the violation of these inequalities in alternative models is evaluated by stochastic simulation. It is shown that the presented inequalities are useful for model verification under partial observability. 相似文献
7.
S. S. Balabanov E. M. Gavrishchuk V. V. Drobotenko E. E. Katkova V. A. Krylov T. I. Storozheva O. Yu. Chernova 《Inorganic Materials》2012,48(4):407-409
We have optimized the composition of a mixture of aluminum yttrium hydroxynitrates, urea, and acetic acid for the self-propagating
high-temperature synthesis of yttrium aluminum garnet (YAG) powder. The powder prepared in this way offers a low degree of
agglomeration, and the ceramic produced from it has a low carbon content. A technique has been proposed for carbon determination
in YAG ceramics through gas chromatographic analysis of the gaseous products of carbide hydrolysis after the dissolution of
the ceramic in pyrophosphoric acid. 相似文献
8.
9.
Oleg Vasylkiv Yoshio Sakka Valeriy V. Skorokhod 《Journal of the American Ceramic Society》2006,89(6):1822-1826
CeCl3 ·7H2 O and GdCl3 ·6H2 O that were dissolved in water were precipitated with urea (NH2 CONH2 ) to produce matrix agglomerates for three-component nano-reactors. Mixing hexamethylenetetramine with dilute nitric acid resulted in the formation of well-dispersed nano-particles of cyclotrimetilene trinitramine (C3 H6 N6 O6 ) (RDX) in the solvent. Nano-reactors were produced by impregnating the nano-C3 H6 N6 O6 into the matrix agglomerates of an intermediate complex of cerium and gadolinium compounds. Blast initiation of the C3 H6 N6 O6 resulted in extremely rapid detonation and gaseous products formation at temperatures of 2000°–5000°C, which were compressed into a volume nearly equal to the initial volume of each RDX nano-particle. Multiple "nano-blasts" occurred in the volume of each nano-reactor. The impact of the blast waves led to fragmentation of the surrounding matter. The evolution of a large volume of gaseous products dissipated the heat of the process and limited temperature increase, thus reducing the possibility of local sintering among the primary particles. The short-term high temperature generated during the blasts enhanced the solid solubility of the metal oxides. Uniform aggregates of 22∼74 nm consisting of 6∼14 nm crystallites of gadolinia in ceria solid solution were synthesized. 相似文献
10.
Oleg Vasylkiv Yoshio Sakka Valeriy V. Skorokhod 《Journal of the American Ceramic Society》2003,86(2):299-304
The 1.5- to 3-mol%-Y2 O3 -stabilized tetragonal ZrO2 (Y-TZP) and Al2 O3 /Y-TZP nanocomposite ceramics with 1 to 5 wt% of alumina were produced by a colloidal technique and low-temperature sintering. The influence of the ceramic processing conditions, resulting density, microstructure, and the alumina content on the hardness and toughness were determined. The densification of the zirconia (Y-TZP) ceramic at low temperatures was possible only when a highly uniform packing of the nanoaggregates was achieved in the green compacts. The bulk nanostructured 3-mol%-yttria-stabilized zirconia ceramic with an average grain size of 112 nm was shown to reach a hardness of 12.2 GPa and a fracture toughness of 9.3 MPa·m1/2 . The addition of alumina allowed the sintering process to be intensified. A nanograined bulk alumina/zirconia composite ceramic with an average grain size of 94 nm was obtained, and the hardness increased to 16.2 GPa. Nanograined tetragonal zirconia ceramics with a reduced yttria-stabilizer content were shown to reach fracture toughnesses between 12.6–14.8 MPa·m1/2 (2Y-TZP) and 11.9–13.9 MPa·m1/2 (1.5Y-TZP). 相似文献