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排序方式: 共有298条查询结果,搜索用时 15 毫秒
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A. N. Utkina Yu. Yu. Cherkis M. N. Kozlova V. L. Kozlov 《Metal Science and Heat Treatment》1982,24(4):270-273
Conclusion To ensure the required characteristics of the diffusion layer in heat-resistant steels, it is recommended to subject them to two-stage nitriding: saturation at 950°C for 2 h in endogas with an addition of 12% natural gas and 4% ammonia, lowering the temperature to 900°C, holding for 5 h in endogas with an addition of 6% natural gas and 4% ammonia; exchange of gas 6 times.Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 34–36, April, 1982. 相似文献
3.
V M Krasnopevtsev L S Trofimenko A V Istomin Iu A Noarov T I Kozlova 《Voprosy pitaniia》1989,(5):40-43
Actual nutrition, health state and physical working capacity were studied in schoolchildren of three age groups after intake of the polyvitamin "Undevitum" during a month. The results of the investigation conducted have shown that prophylactic measures produced a positive effect on the schoolchildren aged from 11 to 13 and from 14 to 17 years who received 1 degree of "Undevitum" daily. No positive effect was recorded in schoolchildren aged 7-10 years who received 1 degree of "undevitum"/day, every other day. 相似文献
4.
1. | Raising the cobalt concentration from 0 to 40% improves the oxidation resistance of Ni–20Cr alloys, since the amount of Cr2O3 in the scale increases. The oxidation resistance is highest for the alloy with 40% Co. Larger amounts of Co up to 70% lead to the formation of CoO in the scale and smaller amounts of chromium oxide, which has a negative effect on the oxidation resistance of Ni–Cr alloys. |
2. | The addition of up to 25% Fe to Ni–20Cr–Co alloys reduces the amount of Cr2O3 in the scale and lowers the oxidation resistance. With larger amounts of Fe the amount of Cr2O3 in the scale again increases, the oxidation resistance increasing correspondingly. Alloys with 45% Fe have the same oxidation resistance as alloys without Fe. |
5.
R. I. Kozlov O. R. Kozlova 《Journal of Computer and Systems Sciences International》2009,48(2):262-271
Modification and extension of procedures of strict analysis of stability and estimates of domains of attraction based on the reduction method with sublinear vector Lyapunov function is given for sufficiently wide class of nonlinear stabilization systems of continuous objects using piecewise constant control formed using discrete state measurements. The new type of realization of heterogeneous comparison systems in the form of interconnected differential and discrete impulse subsystems with varying right-hand side allowing to avoid preliminary discretization of the original system and thus increasing accuracy of investigations is proposed. In the case of nonlinearities (including those with respect to control and measurements), limited by semi-homogeneous functions. Constructive conditions of exponential stability with necessary quantitative estimates are formulated. Application to investigation of stability of economic growth in the Phillips-Bergstrom model with discrete monetary regulation is presented. The paper consists of two parts. In this part, the studied models are described, the studied stability property is defined, procedures for construction of vector Lyapunov function and comparison system are given, and some of their specific features are established. 相似文献
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S. V. Gol’din L. A. Nazarov L. A. Nazarova M. P. Kozlova 《Journal of Mining Science》2007,43(3):237-246
Dilatancy zones generated by an active internal source of isolated force in a heterogeneous rock mass are studied. Based on
the solution of an inverse problem, the method is proposed for locating and determining the source focus parameters using
the measurement data on strains of the daylight surface.
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Translated from Fiziko-Tekhnicheskie Problemy Razrabotki Poleznykh Iskopaemykh, No. 3, pp. 25–35, May–June, 2007. 相似文献
8.
O. Yu. Erenkov A. S. Vereshchagina E. G. Kravchenko M. A. Kozlova 《Russian Engineering Research》2016,36(5):376-378
Preliminary surface deformation (rolling) is proposed in the turning of polymers. The dependence of the surface roughness on the rolling and cutting conditions is derived. 相似文献
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E. M. Voronov A. P. Karpenko O. G. Kozlova V. A. Fedin A. G. Trofimov 《Optical Memory & Neural Networks》2010,19(4):291-299
The problem of the approximate dynamic system attainability domain boundary construction is considered. Results of neural
network-based methods efficiency research for the highly-maneuverable aircraft attainability domain boundaries approximate
construction are presented. 相似文献