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排序方式: 共有382条查询结果,搜索用时 15 毫秒
131.
V. P. Mashirev V. V. Shatalov K. F. Grebenkin Yu. N. Zuev A. V. Panov V. G. Subbotin D. Yu. Chuvilin 《Atomic Energy》2001,90(3):235-242
Experimental work on transferring compact weapons plutonium by pyrochemical methods into its compounds was generalized. Powdered plutonium dioxide was obtained by interaction with moist air at 480–500°C. PuH3 was synthesized by interaction of the metal with hydrogen at 280°C. PuF3 was formed in an interaction of dioxides with HF and H2. The reaction of plutonium hydride with HF also resulted in plutonium trifluoride. PuF4 was synthesized by interaction of PuO2 with HF.In summary, compact plutonium can be transfered by water-free methods into its powdered compounds, which can be used in investigations for developing new types of fuel elements for power reactors. 6 figures, 2 tables, 16 references. 相似文献
132.
The topology selection, design, and performance evaluation of an on-board DC/DC converter, which delivers power from a 48 V input to a 1.2-1.65 V/70 A microprocessor load, are presented. It was shown that the symmetrical half-bridge topology with the current doubler and synchronous rectifiers is a suitable approach for this application. The measured full-load efficiency of a 200 kHz experimental half-bridge converter was higher than 82% in the entire output and input voltage range 相似文献
133.
The paper presents design considerations for a 12-V/1.5-V, 50-A voltage regulator module (VRM) for the next generation of microprocessors. The module has stringent power-density and transient-response specifications, which are hard to meet with traditional design techniques. The proposed design solutions increase the VRM efficiency, as well as achieve the desired transient response with a minimum amount of the output capacitance 相似文献
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V. I. Shapovalov O. A. Shilova I. V. Smirnova A. V. Zav’yalov A. E. Lapshin O. V. Magdysyuk M. F. Panov V. V. Plotnikov N. S. Shutova 《Glass Physics and Chemistry》2011,37(2):150-156
The glass surface has been modified by titanium dioxide films synthesized using the sol-gel method. The sol-gel synthesis
has been optimized by the experimental design with the use of the Latin square method. The film composition has been evaluated
using X-ray powder diffraction analysis and optical measurements. The photoinduced hydrophilicity of the modified glass has
been investigated. 相似文献
138.
E. I. Andreev K. V. Glavin A. V. Ivanov V. V. Malovik V. V. Martynov V. S. Panov 《Russian Journal of Non-Ferrous Metals》2009,50(3):281-285
Features of the macrostructure and microstructure of uranium dioxide powders are considered. Assumptions are made on the mechanisms of the behavior of powders of various natures during pelletizing. Experimental data that reflect the effect of these powders on the quality of fuel pellets, which is evaluated by modern procedures, are presented. To investigate the structure of the powders, modern methods of electron microscopy, helium pycnometry, etc., are used. The presented results indicate the disadvantages of wet methods for obtaining the starting UO2 powders by the ammonium diuranate (ADU) flow sheet because strong agglomerates and conglomerates, which complicate the process of pelletizing, are formed. The main directions of investigation that can lead to understanding the regularities of formation of the structure of starting UO2 powders, which will allow one to control the process of their fabrication and stabilize the properties of powders and pellets, are emphasized. 相似文献
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