Large-deviation inequalities for parameter estimators in stochastic systems

Translated from Kibernetika i Sistemnyi Analiz, No. 2, pp. 95–112, March–April, 1994.     

Repairs of the lining of a rotary cement kiln

An object of this study is the development of a composition of monolithic refractory concrete and a method of ongoing repairs of the lining of cement kilns with its use. The operation of clinker-firing kilns and the processes occurring in firing the concrete are investigated and the process operations of hot repairs of the kiln lining with the monolithic refractory concrete are described. The physicotechnical properties of the concrete and the results of experimental industrial tests are also given. Translated from Ogneupory, No. 4, pp. 25 – 26, April, 1994.     

Energy expenditures and the actual nutrition of workers in a synthetic leather plant

A study was made of energy expenditures and factual nutrition of the workers engaged in synthetic leather manufacture. Antropometric measurements were also taken. Based on the study of daily energy expenditures, the calculations were made of the optimal requirements of the main substances and energy. The actual nutrition of the workers was found to provide the necessary caloricity covering energy expenditures. However, definite shortcomings were revealed in the structure of the foods consumed, namely insufficient intake of vegetable fats, the prevalence of simple sugars in the structure of carbohydrate component, insufficient intake of vitamins A, B1 and folacin. According to the antropometric measurements 30,4% of the examined workers were obese.     

Investigation of strained InxGa1−x As/InP quantum wells fabricated by metalorganic compound hydride epitaxy

An investigation was made of the possibility of using reduced-pressure MOC hydride epitaxy to fabricate highly strained (compressive stress) In_xGa_1−x As/In_0.53Ga_0.47As quantum wells on indium phosphide (100) substrates. The photoluminescence properties of these heterostructures were investigated. It was shown that these heterostructures are potentially useful for laser diodes emitting in the 1.5–2 μm range, which is important for environmental monitoring. Pis’ma Zh. Tekh. Fiz. 24, 46–51 (November 26, 1998)     

Some problems for Clark’s model. II. A solution for Merton’s portfolio problem1

The problem of finding the optimal control over the portfolio for an investor in (B, S)-market is considered. Clark’s model is taken as a model for the stock price evolution. The cases of risk-loving, risk-neutral, and risk-averse investors are considered.     

Limiting parameters of high-power single-stripe laser diodes in the range of 800–808 nm in the pulsed mode

Experimental results on the study of the output parameters of high-power continuous-wave (cw) laser diodes operating in the pulsed mode and the results of numerical simulation of the total efficiency of laser diodes with cavity lengths of 3 and 4 mm in a wide range of pump currents are presented. The spectral parameters of the high-power laser diodes are studied at various pulse-repetition rates. The possible causes of the limited output power in the pulsed mode are discussed.     

AZ31B镁合金薄板超塑性气胀成形

利用热拉伸试验、气胀成形、金相显微镜和扫描电镜,研究AZ31B镁合金薄板热拉伸性能、气胀成形性能及其组织结构.结果表明:在变形温度为425℃,应变速率为1.0×10-3～6.6×10-5s-1时,其流动应力4～12MPa,延伸率则为200%～327%,挤压+热轧,冷轧的镁合金薄板表现出良好的超塑性;在变形温度为425℃,应变速率为1.0×10-3s-1条件下AZ31B镁合金板材的超塑气胀成形性能较好,胀形件的高度可达24 mm以上,其高径比大于0.80.     

Hydrate formation process with consideration of heat and mass exchange

Results are offered from numerical experiments involving hydrate formation in pipelines during quasisteady state flow of a moist gas.Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 55, No. 2, pp. 226–231, August, 1988.     

Measuring the radii of templet profiles by means of heads calibrated in radii

Conclusions Measurements of templet profile radii with existing radii-measuring heads by means of the superposition method and calculations of deviations from the nominal can be recommended only for tentative, approximate evaluations on microscopes BMI and MMI in the course of manufacturing the templets.For the final control of templets after their manufacture, as well as for periodic testing of templets with radii of 0.1–25 mm (and in some cases up to 50 mm) the control and measuring instruments laboratories should use the hump method, preferably with a UIM-21 microscope.It is recommended that the constant chord method, owing to its complexity, be used only for precision measurements either when the size of the templet radius approaches half the sum of r₁ and r₂, or when the subtending angle is small, or else when radii-measuring heads of Zeiss manufacture (types E, E2, R et al.) are used for measuring radii of 25 to 80 mm.