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排序方式: 共有729条查询结果,搜索用时 19 毫秒
71.
OI Potrokhov DV Dolgikh VP Kas'ianovskaia OI Shevchenko 《Canadian Metallurgical Quarterly》1997,(7):14-18
The study covered influence of combined toxic chemicals on fire extinguishers. Acute exposure of respiratory and peripheral nervous systems was demonstrated. Consequences of the exposure were proved to include polyneuropathies, neuroses and other health disorders. 相似文献
72.
73.
74.
L. I. Kuksenova S. A. Gerasimov M. S. Alekseeva V. G. Lapteva S. V. Lazarev 《Journal of Machinery Manufacture and Reliability》2011,40(6):527-531
This study considers the results of an experimental evaluation of the ability of superficial layers of nitrated steels and
alloys to resist damage in the conditions of frictional deformation and superficial plastic deformation. A new approach is
offered to evaluate and choose modes of nitration of parts of friction assemblies. 相似文献
75.
76.
We demonstrate that the structural perfection of silicon layers on sapphire can be improved through high-temperature solid-state
recrystallization after preamorphization of the most imperfect silicon layer near the silicon/sapphire interface by high-energy
oxygen ions, followed by high-temperature recrystallization in an inert atmosphere. 相似文献
77.
M. A. Dem’yanenko D. G. Esaev I. V. Marchishin V. N. Ovsyuk B. I. Fomin B. A. Knyazev V. V. Gerasimov 《Optoelectronics, Instrumentation and Data Processing》2011,47(5):508-512
The mechanism of occurrence of sensitivity of microbolometer detector arrays based on vanadium oxide to terahertz radiation
are analyzed. Experimental data are given showing the possibility of increasing the sensitivity of microbolometer detectors
in the terahertz range by using an additional thin metal absorbing layer applied on the microbolometer membrane. A polarization
dependence of the sensitivity of microbolometers in the terahertz and far infrared spectral ranges is found. It is shown that
the sensitivity of microbolometers in the terahertz range is due to the absorption of radiation in the narrow metal runs placed
on the support legs of the microbolometers and playing the role of an ohmic contact between the heat-sensitive layer and the
processing curcuit. 相似文献
78.
AL Zakharenko SN Khodyreva NI Rechkunova IV Safronov DV Pyshnyi SK Degtyarev OI Lavrik 《Canadian Metallurgical Quarterly》1998,63(8):929-934
The aim of this study was to evaluate the influence of nicotine on the daily rhythms of heart rate, body temperature and locomotor activity in unrestrained rats by use of implanted radiotelemetry transmitters. The study was divided into three seven-day periods: a control period, a treatment period and a recovery period. The control period was used for baseline measurement of heart rate, body temperature and locomotor activity. During the treatment period three rats received nicotine (1 mg kg(-1), s.c.) at 0900 h. Three rats received saline under the same experimental conditions. Heart rate, body temperature and locomotor activity were continuously monitored and plotted every 10 min. During the three periods a power spectrum analysis was used to determine the dominant period of rhythmicity. If daily rhythms of heart rate, body temperature and locomotor activity were detected, the characteristics of these rhythms, i.e. the mesors, amplitudes and acrophases, were determined by cosinor analysis, expressed as means +/- s.e.m. and compared by analysis of variance. Nicotine did not suppress daily rhythmicity but induced decreases of amplitudes and phase-advances of acrophases for heart rate, body temperature and locomotor activity. These perturbations might result from the effects of nicotine on the suprachiasmatic nucleus, the hypothalamic clock that co-ordinates biological rhythms. 相似文献
79.
80.
SM Liapunov IF Seregina OI Okina VV Golubchikov IV Kislova AA Kistanov EP Shevchenko NM Sorokina 《Canadian Metallurgical Quarterly》1998,(12):37-44
The authors specified methods to detect lead in biologic materials. The quality control covered use of Russian and foreign standard samples, the results proved to agree. Lead was detected by AAS technique (direct and flow-type variants with preliminary concentration of lead) and ELRA method. The authors determined measurement limits sufficient for analysis of complex biologic materials. The measurement range for lead varied from 0.002 mg/kg (plants) to 3,000 mg/kg (soil); the range of serum lead levels was < 0.5-39 mg/dl. 相似文献