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排序方式: 共有1093条查询结果,搜索用时 15 毫秒
1.
G. A. Kolmakov V. F. Zanozina E. N. Karataev D. F. Grishin A. D. Zorin 《Petroleum Chemistry》2006,46(6):384-388
The feasibility of manufacture of asphaltic materials by means of the thermal cracking of acid tars was shown and a corresponding bench-scale unit was designed. The dependence of the viscosity characteristics of the obtained compositions on the temperature and time of the process was examined using the penetration technique. 相似文献
2.
N Sobel V Prabhakaran JE Desmond GH Glover EV Sullivan JD Gabrieli 《Canadian Metallurgical Quarterly》1997,78(1-2):115-123
A method for generating olfactory stimuli for humans within a functional magnetic resonance imaging (fMRI) experimental design is described. The system incorporates a nasal-mask in which the change from odorant to no-odorant conditions occurs in less than 500 ms and is not accompanied by visual, auditory, tactile, or thermal cues. The mask provides an ordorant-free environment following prolonged ordorant presence. Specific imaging parameters that are conducive to the study of the human olfactory system are described. In a pilot study performed using these methods, the specific patterns of activation observed converged with published experimental and clinical findings. 相似文献
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I. A. Grishin V. A. Gur'ev E. B. Intyushin Yu. E. Elliev A. P. Savikin 《Inorganic Materials》2004,40(4):431-433
TeO2–WO3 glasses coactivated with Er3+ and Yb3+ are prepared. The effect of Yb content on the efficiency of Er photoluminescence (PL) in the visible and IR spectral regions is studied. The highest PL efficiency is achieved at an Er : Yb atomic ratio of 1 : 1. The PL lifetime for the Er3+
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13/2 level is determined to be 7–9 ms. 相似文献
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Cross-linking additions of silicon carbide and waste material from ferroalloy production make it possible to increase the
heat-resistance index for mullite-containing refractories. For briquette specimens based on a charge containing aluminum powder
it reaches 45 thermal cycles (1300°C – water).
Translated from Novye Ogneupory, No. 11, pp. 44–46, November 2008. 相似文献
7.
Yu. A. Radin I. A. Grishin T. S. Kontorovich O. B. Panshina A. V. Chugin 《Power Technology and Engineering (formerly Hydrotechnical Construction)》2006,40(2):113-119
Problems arising with connecting the second exhaust-heat boiler to the first exhaust-heat boiler under load in the case of
flow circuits of combined-cycle plants of type PGU-450 are considered. Similar problems exist for two-boiler single-turbine
units of type PGU-325 and for two-boiler single-turbine units of traditional steampower plants with an output of 200–300 MW
upon connection of the second furnace of a two-furnace boiler to the operating first furnace. Analysis of the temperature-induced
stressed state and of the cyclic strength of thick-walled elements of the steam-water conduit of PGU-450 and of two-furnace
boilers of two-boiler single-turbine units with an output of 200–300 MW (the check valve, the inlet header of the water economizer)
is used for determining the steam temperature differences in the high-pressure conduits to the steam turbine and the order
of connection of the second exhaust-heat boiler to the operating fist one. Modes of enabling a two-boiler single-turbine unit
of a combined-cycle plant, which are most “rigid” from the standpoint of thermal strength, are determined.
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Translated from élektricheskie Stantsii, No. 2, February 2006, pp. 11–17. 相似文献
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Two site-specific endonucleases, RspLKI and RspLKII, have been isolated and purified to functional homogeneity from the soil bacterium Rhodococcus species LK2. RspLKI recognizes the 5'-GCATG decreases C-3' DNA sequence and RspLKII recognizes the 5'-G decreases GATCC-3' sequence (arrows indicate DNA cleavage sites). The isolated enzymes are class II site specific endonucleases and are isoschizomers of endonucleases SphI and BamHI, respectively. 相似文献