CORRELATION BETWEEN THE POTENTIAL MORPHOLOGIC-MOTOR INDEX OF SKIJUMPERS AND THEIR COMPE'TITIVE SUCCESS

The purpose of the study was to find the correlation between the morphologic-motor potential index of ski-jumpers and their competitive success. A sample of twenty-two top Slovene ski-jumpers, among which was also the two-time winner of the World Cup in the seasons 1996197 and 1997198, gave a statistically significant correlation (r=.48;

KINEMATIC, KINETIC AND ELECTROMYOGRAPHIC CHARACTERISTICS OF THE SPRINTING STRIDE OF TOP FEMALE SPRINTERS

The main purpose of this study was to find those kinematic, kinetic and electromyographic parameters of the sprinting stride that most affect maximal velocity of top female sprinters. A 20 m flying start test was made with a sample of four female sprinters of the Slovene National team. In addition to maximal velocity, nine kinetic parameters in the contact phase of the sprinting stride were measured. It was found that the most important generators of maximal velocity are: duration of contact phase, duration of braking phase, minimal braking impulse, maximal impulse in propulsion phase, preserving maximal horizontal velocity of CG in braking phase and maximal grabbing velocity of the foot in the forward contact phase. In light of the EMG activation, m. biceps femoris is one of the most important muscles in the sprint

COMPARISON OF ISOMETRIC AND DYNAMIC METHODS OF STRENGTH TRAINING PROGRAM

The purpose of this study was to determine the difference in the quality of muscle strength employing two methods of strength training (isometric, dynamic). Nineteen male university students volunteered to participate in the experiment, encompassing a five week strength training sessions. The dynamic method was applied to the elbow flexion and extension of the right side (load totalling 60 % of maximal performance) and the isometric method applied on the same muscle groups of the left side (maximal voluntary isometric contraction). Pre- and post-test measurements included maximal isometric strength, the angle a expressed the speed of increasing muscle strength and the number of repetitions performed for each exercise (at a of load 60 % max), as a measure of muscle endurance. No differences were found between the results of strength training when using both methods (isometric, dynamic). A five week training program improved the isometric force by about 8-14 % of pre-test values, and by about 34-54 % in repetition exercises with the load. No differences were exhibited in the rate of the speed of increasing muscle strength

Uber die Darstellung von Additionsverbindungen des wasserfreien Scandiumchlorids und Scandiumbromids mit Alkoholen

Es wird gezeigt, dass das wasserfreie Scandiumchlorid bzw. Scandiumbromid mit verschiedenen Alkoholen ROH wohldefinierte Additionsverbindungen von der Zusammensetzung ScX3 • n ROH bilden, wobei n bis auf Ausnahmen ganzzahlig und hochtens gleich 5 ist. Die Darstellung der hochsten Additionsverbindungen erfolgte durch die Einwirkung von Alkoholdampfen auf das wasserfreie Scandiumhalogenid, wahrend die niederen Additionsverbindungen durch den stufenweisen Abbau erhalten werden

Subcell Operation and Long Term Stability Analysis of Perovskite Based Tandem Solar Cells Using a Bichromatic Light Emitting Diode Light Source

In monolithic tandem solar cells, current voltage J V characteristics of subcells provide invaluable information about their quality and tandem operation. However, accessing the subcell J Vs is challenging and requires sophisticated spectral methods. Herein, a customized, bichromatic light emitting diode setup BCLED for in depth analysis of tandem solar cells, suitable for subcell operation analysis, and long term stability testing is presented. For this, two spectrally independent LED arrays are used to selectively bias the two subcells. The power of the developed setup is demonstrated by successfully disentangling the tandem J V curve into subcell J V curves. The method is based on a one diode model for each subcell and is validated by electrical simulations. Afterward, it is used on a fabricated 27.6 efficient perovskite silicon tandem device, resulting in great agreement with the measured J V curve. Therefore, the BCLED setup is a versatile tool, suitable for subcell characteristics and long term stability analysis of tandem solar cell

Is diet partly responsible for differences in COVID-19 death rates between and within countries?

Correction: Volume: 10 Issue: 1 Article Number: 44 DOI: 10.1186/s13601-020-00351-w Published: OCT 26 2020Reported COVID-19 deaths in Germany are relatively low as compared to many European countries. Among the several explanations proposed, an early and large testing of the population was put forward. Most current debates on COVID-19 focus on the differences among countries, but little attention has been given to regional differences and diet. The low-death rate European countries (e.g. Austria, Baltic States, Czech Republic, Finland, Norway, Poland, Slovakia) have used different quarantine and/or confinement times and methods and none have performed as many early tests as Germany. Among other factors that may be significant are the dietary habits. It seems that some foods largely used in these countries may reduce angiotensin-converting enzyme activity or are anti-oxidants. Among the many possible areas of research, it might be important to understand diet and angiotensin-converting enzyme-2 (ACE2) levels in populations with different COVID-19 death rates since dietary interventions may be of great benefit.Peer reviewe

Strategy for large???scale monolithic Perovskite/Silicon tandem solar cell: A review of recent progress

For any solar cell technology to reach the final mass-production/commercialization stage, it must meet all technological, economic, and social criteria such as high efficiency, large-area scalability, long-term stability, price competitiveness, and environmental friendliness of constituent materials. Until now, various solar cell technologies have been proposed and investigated, but only crystalline silicon, CdTe, and CIGS technologies have overcome the threshold of mass-production/commercialization. Recently, a perovskite/silicon (PVK/Si) tandem solar cell technology with high efficiency of 29.1% has been reported, which exceeds the theoretical limit of single-junction solar cells as well as the efficiency of stand-alone silicon or perovskite solar cells. The International Technology Roadmap for Photovoltaics (ITRPV) predicts that silicon-based tandem solar cells will account for about 5% market share in 2029 and among various candidates, the combination of silicon and perovskite is the most likely scenario. Here, we classify and review the PVK/Si tandem solar cell technology in terms of homo- and hetero-junction silicon solar cells, the doping type of the bottom silicon cell, and the corresponding so-called normal and inverted structure of the top perovskite cell, along with mechanical and monolithic tandemization schemes. In particular, we review and discuss the recent advances in manufacturing top perovskite cells using solution and vacuum deposition technology for large-area scalability and specific issues of recombination layers and top transparent electrodes for large-area PVK/Si tandem solar cells, which are indispensable for the final commercialization of tandem solar cells