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41.
42.
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
43.
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
44.
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
45.
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
46.
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
47.
48.
It is concluded on the basis of predictions of the growth in demand for fresh water that nuclear desalination has promise.
The world status of and experience in nuclear desalination are reviewed. The requirements for using nuclear-powered desalination
complexes are examined. Substantiation is given for the desirability and practicability of building such complexes in floating
units based on the type of reactors used in ships. The basic design characteristics of a floating complex with a KLT-40S nuclear
power system are presented.
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Translated from Atomnaya énergiya, Vol. 102, No. 1, pp. 31–35, January, 2007. 相似文献
49.
AL Okorokov KI Panov WA Offen VG Mukhortov AA Antson Karpeisky MYa AJ Wilkinson GG Dodson 《Canadian Metallurgical Quarterly》1997,10(3):273-278
We have developed a model of ischaemia-reperfusion injury in C57BL/6 mice involving ischaemia for 0.5 to 2.5 h with an elastic tourniquet on one hind limb and reperfusion for 24 h, analogous to a well-established model of ischaemia-reperfusion injury in the rat. Viability was assessed in tissue homogenates of the gastrocnemius muscles from the affected and contralateral control limb by a triphenyl tetrazolium chloride dye reaction, measuring the activity of the oxidative mitochondrial enzymes. After 1.5 h ischaemia and 24 h reperfusion, viability in the ischaemic-reperfused limb was 13%, with the control muscle regarded as 100% viable. Significant improvements in viability to 86% (P < 0.05) and 56% (P < 0.05) were achieved, with administration 30 min prior to tourniquet release, of the nitric oxide (NO) synthase inhibitor nitro-L-arginine methyl ester (L-NAME, 30 mg/kg) and the anti-inflammatory glucocorticoid dexamethasone (2.5 mg/kg) respectively, with similar findings in the rat tourniquet model. 相似文献
50.