Construction of markov processes from hitting distributions

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47648/1/440_2004_Article_BF00538487.pd

Three-phase power factor corrector with direct power control and power supply of the unbalanced industrial network

Nowadays three-phase power factor correctors (PFC) became widely used. This is dictated by strict requirements of the international electrical technical commission standards to harmonic composition of current supplied by three-phase industrial network. New schematic technical version of three-phase PFC having direct power control and improved efficiency factor is presented. Mathematical description of power component and control system taking in account its functioning depending upon asymmetrical three-phase input voltage was fulfilled. The electrical processes in the presented PFC was analysed by means of computer simulation. The obtained results are of interest to the persons engaged in the development of electrical energy systems and complexes to which higher requirements in respect to power loss reduction and reliable functioning in case of three-phase asymmetrical industrial network are imposed

Technique Preventive Maintenance of Complications at Damages of the Pancreas

Results of treatment of 135 victims with damage of a pancreas and results of experimental researches lead on 127 white rats are analysed. It is established, that expansion of volume of operation on damaged iron does not conduct to improvement of results of treatment. Phase changes of average perfusion blood in a pancreas are revealed at development of an experimental posttraumatic pancreatitis. Development destruction in iron coincided on time with a phase re-perfusion. Local hypothermya pancreas reduced rate re-perfusion and reduced a degree destruction its fabrics. By results of research the technique intraoperation preventive maintenance of complications of damages of a pancreas is develope

Dynamics of laser speckle imaging of blood flow and morphological changes in tissues with a full time local ischemia of pancreas

The purpose: to establish influence of a full ischemia of different duration and the subsequent reperfusionon pathology development in pancreas of rats by means of laser speckle-visualization and lifetime digital microscopy. Materials and Methods. The work has been performed on 42 white rats of line Wistar in weight of 200-250 Research of properties of a blood-groove was made by means of methods laser Doppler flowmetry, digital biomicroscopy and a method of laser speckle-contrast visualization. Results. After the termination of a 5-minute full ischemia the speed of bloodflow has been increased in 2-3 times, clinic pancreatic necrosis is marked does not develop. After the termination of 20-minute full ischemia the increase in speed of a bloodflow did not occur, there were morphological and clinical signs of pancreatic necrosis. Conclusion, the efficiency of monitoring of microhemodynamics of pancreas in rats by the method of speckle-capillary of full field has been shown. Multidirectional phase of perfusion changes in pancreas have been revealed after reversible infringement of blood supply of different duration