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The trends in the improvement of the economic characteristics of nuclear power plants, one of which is the prolongation of
the reactor campaign, i.e., the period in which the fuel is situated in the active zone under the due increase in its burnup
level, are considered. Such an increase can be achieved, specifically, via using fuel with burnable absorbers, as well as
by improving the quality of fuel pellets obtained by powder metallurgy. It is necessary to toughen the technical requirements
for fuel pellets and improve the technology of their production and the equipment used in their fabrication. It is noted that
the works for improving the operational factors of fuel pellets (particularly, lowering their gas release and decreasing the
interaction of the fuel with the cladding) are currently mainly oriented to producing pellets with burning absorbers; obtaining
the optimal microstructure (porosity and grain size) of the pellets; improving their shape; excluding dust on their surface
after smoothing; and stabilizing their properties in regards to geometric sizes, density, and aftersintering. 相似文献
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Small-signal analysis and control design of isolated power supplies with optocoupler feedback 总被引:2,自引:0,他引:2
Optocouplers are widely used in isolated power supplies to transfer the feedback signal from the secondary to the primary side. In many power supplies, the feedback amplifier is supplied from the output voltage that creates additional feedback path which should be taken into account in the control design. The paper presents a detailed analysis and control design for each of the two possible feedback loops that can be identified. In addition, dynamic limitations of the TL431 shunt regulator and of the optocoupler are discussed. Practical guidelines for the error amplifier design and a design example are presented for both voltage-mode and current-mode controls. 相似文献
46.
T. A. Kostereva Yu. N. Panov V. N. Artem’eva N. V. Kukarkina N. A. Nikanorova V. V. Kudryavtsev 《Journal of Engineering Physics and Thermophysics》2005,78(5):948-953
The time change in the melt viscosity of the polyamide composite forming at the final stage a polymer with the structure of
a semi-interpenetrative polymer mesh has been investigated. To impregnate with the composite melt the carbon fiber for forming
carbon-filled plastics, it is necessary to preserve the low viscosity of the melt for a long time. This is achieved by preliminary
heat treatment of the composite and introduction of fullerene into it.
__________
Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 5, pp. 109–113, September–October, 2005. 相似文献
47.
P. A. Bak A. M. Batrakov R. A. Kadyrov P. V. Logachev A. V. Pavlenko A. N. Panov V. Ya. Sazanskii G. A. Fatkin 《Optoelectronics, Instrumentation and Data Processing》2011,47(3):303-312
The structure, operation logic, and hardware tools of the control system of a linear induction accelerator for an X-ray complex
are considered. The hardware developed in the CompactPCI standard for the control system is described. The possibility of
embedding of smart microelectronic equipment into high-voltage elements of the facility is analyzed. 相似文献
48.
AL Okorokov KI Panov RH te Poele HJ Breukelman A Furia Karpeisky MYa JJ Beintema 《Canadian Metallurgical Quarterly》1995,6(4):472-480
Bovine pancreatic ribonuclease (RNase A) is a member of a homologous group of extensively studied proteins. It is a small, basic protein, containing 124 amino acid residues and four stabilizing disulfide bridges. Ribonuclease A catalyzes the hydrolysis of the phosphodiester bonds in ribonucleic acids. Since this degradation of RNA interferes with normal cell functions, the signal peptide of alkaline phosphatase (phoA, Escherichia coli) was cloned onto the gene coding for RNase A, directing the protein to the periplasm. Several expression systems have been evaluated which use T7, trc, or PR promoters to transcribe the RNase A gene. Also, variation in host strains was tested to optimize the protein yield. It was found that the PR system gave better expression than the two other systems. E. coli strain BL21 was shown to be the strain in which export to the periplasm was most effective and recombinant RNase A could be isolated from the periplasmic fraction of these cells. The system provides a stable yield of active recombinant bovine pancreatic RNase of about 45-50 mg/liter of cell culture. 相似文献
49.
Whether a high-resolving light scattering spectrometer may be used in medical practice is discussed in the paper. The results of the experiments on blood components and microorganisms are discussed. 相似文献
50.