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101.
T. A. Akunov O. V. Slita S. A. Sudarchikov A. V. Ushakov 《Journal of Computer and Systems Sciences International》2013,52(4):535-541
An algorithm for the synthesis of median modal control of a plant with parametric uncertainties given in interval form is proposed. It is supplemented by the check of relative interval estimate of the system state matrix, that ensures the required interval estimate of the quality indices. The results are illustrated by an example. 相似文献
102.
A. V. Radha Oscar Bomati-Miguel Sergey V. Ushakov Alexandra Navrotsky Pedro Tartaj 《Journal of the American Ceramic Society》2009,92(1):133-140
A fundamental issue that remains to be solved when approaching the nanoscale is how the size induces transformation among different polymorphic structures. Understanding the size-induced transformation among the different polymorphic structures is essential for widespread use of nanostructured materials in technological applications. Herein, we report water adsorption and high-temperature solution calorimetry experiments on a set of samples of single-phase monoclinic zirconia with different surface areas. Essential to the success of the study has been the use of a new ternary water-in-oil/water liquid solvothermal method that allows the preparation of monoclinic zirconia nanoparticles with a broad range of (BET) Brunauer–Emmett–Teller surface area values. Thus, the surface enthalpy for anhydrous monoclinic zirconia is reported for the first time, while that for the hydrous surface is a significant improvement over the previously reported value. Combining these data with previously published surface enthalpy for nanocrystalline tetragonal zirconia, we have calculated the stability crossovers between monoclinic and tetragonal phases to take place at a particle size of 28 ± 6 nm for hydrous zirconia and 34 ± 5 nm for anhydrous zirconia. Below these particle sizes, tetragonal hydrous and anhydrous phases of zirconia become thermodynamically stable. These results are within the margin of the theoretical estimation and confirm the importance of the presence of water vapor on the transformation of nanostructured materials. 相似文献
103.
N. A. Dudarenko A. V. Ushakov 《Optoelectronics, Instrumentation and Data Processing》2010,46(2):120-124
The degeneration property of dynamic multivariable control systems is considered. In this work, by degeneration for a multivariable
systems is meant primarily a decrease and even a loss of its operating capacity. A technique of quantitative assessment of
the tendency of multivariable control systems to degeneration was developed using a singular decomposition of criteria matrices
formed on the basis of the matrix formalism of Faddeev-Leverrier algorithm, Gramian representation, matrix coefficient of
the expansion of the system output vector in the derivatives of the control input vector, and with the use of the matrix formalism
of Sylvester’s and Lyapunov’s equations 相似文献
104.
包头地区粉煤灰在混凝土中的应用 总被引:2,自引:1,他引:2
本文首先描述了包头地区粉煤灰的化学成份及其特性分析,然后介绍了为改善混凝土特性而掺入最优量粉煤灰的三种实验方法,并给出了整个实验过程和测试结果,在此基础上,作者讨论了包头地区粉煤灰在混凝土中应用的可行性。 相似文献
105.
Results are reported from factory testing of different models of equipment that make it possible to limit the oxidation of
steel as it is being cast on the tundish-mold section of continuous casters. A study is made of the effect of the chosen method
of protection on point segregation at the edges of the continuous-cast semifinished product and the formation of gas bubbles
inside it.
__________
Translated from Metallurg, No. 1, pp. 45–47, January, 2007. 相似文献
106.
107.
108.
24-h fluctuations in the response of CNS (occurrence of the complex of neurological disorders) were studied in white rat males which were exposed to gamma radiation (Co-50, 62.5 Gy, craniocaudally) or injected alcohol (2.25 g/kg, 15% solution, i.p.). After alcohol administration, the above fluctuations were at first almost similar to those in response to the radiation. Later, the curve of the CNS sensitivity to alcohol was leveling, rhythm phases shifted without the rhythm inversion. Neurological symptoms induced by alcohol and radiation were very much alike suggesting the existence of common mechanisms of nonspecific regulation evident early after exposure to these two factors. 相似文献
109.
110.
P. N. Slyusarev G. N. Ushakov O. V. Starkov L. A. Kochetkov L. N. Nesterova V. Ya. Kozlov 《Atomic Energy》1961,9(2):601-607
An important problem in the design of boiling reactors or reactors with boiling and superheating of the steam in channels is the study of the level of contamination of steam by radioactive materials, generated and directed into the turbine, the physicochemical properties of the radioactive deposits and the possibility of deactivation of the internal surfaces of the pipes and turbine.At the first atomic power station, studies were made on the transfer of radioactive materials by steam and water in the loop built into the first circuit of the power station. A determination was made of the coefficient of deposition of the materials on the internal surface of the pipes, and the chemical stability of the deposits was studied. Studies were made on problems of deactivation of some parts of the steam power equipment of the station. 相似文献