Analysis of psychophysiological characteristics in young basketballers trained by traditional and experimental programs

The purpose of the study was to compare and analyze the psychophysiological characteristics of young bas- ketball players who trained according to both traditional program and experimental training program. The experimental training program provides motor actions realization in suddenly changing conditions. Research methods and organization. The study involved 24 basketball players aged 13-14 years, with the expe- rience of sports activities from 5 to 6 years. The complex "NS-Psychotest" (2007, Ivanovo) was used to evalu- ate psychophysiological characteristics using the tests "Simple visual-motor reaction", "Reaction to a moving object" and "Complex visual-motor reaction".. Differences significance was established using one-way variance analysis (ANOVA) with Post-Hoc analysis using the Newman-Keuls criterion (STATISTICA 10 software pack- age). Research results. Our training program aimed to coordination abilities improvement included open competi- tive basketball exercises, a set of body core static exercises and special exercises on the balance ladder. It was revealed that basketball players reaction stability decreasing after the end of training programs both in the experimental group (by 2.67%) and in the control group (by 1.08%) at p <0.05. At the same time most studied psychophysiological characteristics in the experimental group tended to increase, versus decreasing in the control group. Conclusion. Thus, our experimental training program for young basketball players aimed to coordination abilities improvement has a positive effect to the athletes psychophysiological characteristics and it can be used for competitive results improving.

Investigation of the Pathogenesis and Treatment Efficiency of Bevacizumab-Induced Hypertension in the Rat Model

Bevacizumab is known to reduce Vascular Endothelial Growth Factor (VEGF) to undetectable levels when used in conjunction with chemotherapy. Hypertension is a frequent adverse effect of bevacizumab, although its mechanism(s) remain unclear. In this study, our aim was to examine the pathogenesis of bevacizumab-induced hypertension and to investigate the treatment efficacy of valsartan. A total of 24 Wistar Albino female rats were included in the study. Rats were divided into three groups with 8 rats in each, as follows: The control group, bevacizumab group and bevacizumab + valsartan group. Blood pressure, blood urea nitrogen and serum creatinine levels were measured, urine samples were collected for 24 hours statistical analyses were performed using IBM SPSS 20 software pack. Nephrectomy specimens in bevacizumab and bevacizumab + valsartan groups exhibited varying degrees of renal injury. Although valsartan was able to reduce the bevacizumab-induced rise in blood pressure, it could not prevent the development of nephropathy. Conclusions these findings suggest that hypertension occurring secondary to bevacizumab treatment in rats may be associated with mechanisms involving renal injury.

STUDY OF AIR DISTRIBUTION AT ELONGATED TRANSPORT TUNNELS OF BAIKAL-AMUR MAINLINE

At the paper results of study of air distribution at elongated railway tunnels from piston effect of trains are represented. Simulation was carried out on the example of movement of freight train with length of 1 km at tunnels with length 3 and 6 km by numerical experiment in ANSYS Fluent software pack. As a result of the study, dependences of air pressure to front and rear surfaces of train on its position in the tunnel and on value of aerodynamic resistance of the gap between train and wall of the tunnel are obtained. The results have been used for development of quasi-dynamic model of piston effect of trains for solution of static air distribution problems on network models. Comparison of air discharge at various tunnel cross-sections obtained using ANSYS Fluent pack and network model shows satisfied repeatability. In that case, time of problem solution for a tunnel with length 3km on network model in 4·105 lower than on volume model. It has important practical meaning for multivariant calculations during designing of ventilation systems at railway tunnels.

Numerical research on inlet total pressure distortion in a transonic compressor with non-axisymmetric stator

The adverse impacts of non-uniform inlet flow have been the focus for several decades with the increase of the operating range of engines. A deep understanding of the flow mechanism of distortion passing through a compressor is needed urgently and the improvement of the compressor performance becomes more and more important. In this paper, a non-axisymmetric stator is presented with significant non-axisymmetric characteristics in a transonic compressor to investigate compressor performance and flow field effects. A time-dependent three-dimensional Reynolds-averaged Navier-Stokes equation composed in ‘Fluent Software Pack’ is validated and used to perform the simulations. The flow fields with distorted inlet are obtained and the effects of original stator and non-axisymmetric stator in a transonic compressor are compared. The results are discussed in terms of the effects of non-axisymmetric stator on compressor performance, blockage of flow passage, rotor and stator. The results show that the non-axisymmetric stator influences not only the stator flow field but also the rotor flow field, so the efficiency and total pressure ratio are improved correspondingly.

Determining the Driving Torques of the Robots with Delta 3DOF Parallel Structure by Using the MSC ADAMS Software Pack

During the latest years the parallel structure robots have been used more and more due to their advantages that consist of: high stiffness, availability for usage at higher speed and acceleration rates. In general these robots are used for handling light objects [. For choosing the driving servomotors of the robots, the maximum torques needed for the parallel mechanism to transport an object of a certain weight, along a trajectory, at a certain speed and acceleration, have to be considered. In this work the authors are approaching the study of the variation of the driving torques of the robots with parallel structure Delta 3DOF along a trajectory, in order to select the driving servomotors [2]. For analyzing the driving torque variations along a trajectory the MSC Adams software pack has been used.

Effects of Bowed Stators on a Transonic Fan With Distorted Inlet

The adverse impacts of inlet distortion on fan/compressor have been recognized as an important problem for several decades, and it is still a topic of considerable interest. Many research works indicate that it is possible to improve the performance and stability of a fan in clean and distorted inlet flow by using bowed stator blades. But, how bowed stator influences the flow field and what kind of bow patterns and angles can improve fan performance better are still not clearly studied. Therefore, a 3D analysis in fan flow field with different bowed stator blades is required. In this paper, a time-dependent three-dimensional Reynolds averaged Navier-Stokes equation composed in “Fluent Software Pack” is carried out in a parallel supercomputer. The fan with straight/different bowed stators is simulated with a clean/distorted inlet boundary condition to obtain a better understanding of bowed stators effects in distorted flow field. The analysis of results consists of three aspects. The first is about the effects of straight/bowed stators on the fan characteristics with clean and distorted inlet. Bowed stators can improve the fan performance significantly when inlet is distorted, especially at design point. But, when inlet is clean bowed stators even worsen the fan performance at design point. The effects of bowed stators on the fan performance at design point are analyzed secondly. It is found that different bow angles have different influence on rotor or stator flow field. Small bow angle stator reduces the flow loss in rotor but have no effect on stator flow field. Large bow angle stator can reduce the flow loss in stator markedly, but increases the rotor loss. Finally the patterns of flow loss caused by total pressure distortion with straight and different bowed stators are compared and analyzed in detail. The scale of vortex in stator is weakened by large bow angle blades significantly, which decreased the stator loss.