NERYO-CHAGI KINEMATIC CHARACTERISTICS EVALUATION IN IMPACT SINGLE COMBATS BY EXAMPLE OF WTF TAEKWONDO VIA FEEDBACK TECHNOLOGIES

This article is dedicated to topical issues related to feedback information technologies. As of now, there is not enough research on the topic of studying the kinematic characteristics of athletes in full-contact martial arts using tracking feedback systems. Research methodology: To test the hypothesis concerning the practicability of modern information technologies application, there was held an experiment with WTF taekwondo martial arts athletes. The researchers examined 4 athletes: 2 highly qualified athletes (elite) and 2 sub-elite athletes. The GPS/LPS RealTrack System by Wimu Pro Spain, was chosen to record the motion parameters. Neryo-Chagi was randomly chosen to assess the kinematic characteristics (exploratory study). Neryo-Chagi was considered as an integral motor action, which consists of two types of movement: 1) swing and 2) shock movement (strike). Research results: At the moment of Neryo-Chagi strike, there is a linear increase in the angular velocity (degrees/sec) from low to maximum. When performing a swing and a shock movement (strike), the angular velocity (deg / s) is different. The maximum angular speed during the swing is observed when strikes the way they are in a fight are compared to the maximum, medium and slow intensity. Swing time (s) with elite athletes is higher compared to sub-elite ones, while the time to perform a strike movement does not differ. Elite athletes have higher maximum angular velocity during the swing and strike movement. Evaluation of the main motor actions of athletes, classified by kinematic characteristics, allows a new assessment of their effectiveness.  Article visualizations

The Complexation of Silver (I) ion with 18-Crown-6 Ether in Water and Some Polar Aprotic Solvents

Методом прямого потенциометрического титрования изучен процесс комплексообразования ионов серебра (I) с 18-краун-6 эфиром в среде некоторых полярных водно-апротонных растворителей при постоянной температуре 308 К. Константы устойчивости образующегося комплекса определены при различных мольных долях диметилсульфоксида и диметилформамида от 0,2 до 0,8 в составе смешанного растворителя. Показано, что, несмотря на одинаковую природу сорастворителей, они оказывают прямо противоположное действие на константу устойчивости комплекса вследствие неустойчивости ДМФА в кислой среде и при нагревании. Отмечено, что исследуемая реакция комплексообразования является экзотермичной, а повышение температуры уменьшает устойчивость исследуемых комплексовThe process of complexation of silver (I) ions with 18-crown-6 ether in some polar water-aproton solvents at a constant temperature of 308К was studied by direct potentiometric titration. The stability constants of the resulting complex are determined depending on the molar fraction from 0.2 to 0.8 dimethylsulfoxide and dimethylformamide in the composition of the mixed solvent. It is shown that, despite the same nature of the co-solvents, they have the opposite effect on the stability constant of the complex due to the instability of DMF in an acidic medium and when heated. It is noted that the studied reaction is exothermic and the temperature increase reduces the stability of the studied complexe

Finite-Element Modeling of Spontaneous Potential in an Axisymmetric Reservoir Model with Account of Its Shale Content

(1) This article is devoted to the development of a theoretical and algorithmic basis for numerical modeling of the spontaneous potential method (SP) as applied to the study of sandy-argillaceous reservoirs. (2) In terms of coupled flows, we consider a physical–mathematical model of SP signals from an electrochemical source, with regards to the case of fluid-saturated shaly sandstone. (3) An algorithm for 2D finite-element modeling of SP signals was developed and implemented in software, along with its internal and external testing with analytical solutions. The numerical SP modeling was carried out, determining the dependences on the reservoir thickness and porosity, the amount of argillaceous material and the type of minerals. We performed a comparative analysis of the simulated and field SP data, using the results of laboratory core examinations taken from wells in a number of fields in the Latitudinal Ob Region of Western Siberia. (4) The results of the study may be used either for the development of the existing SP techniques, by providing them with a consistent computational model, or for the design of new experimental approaches

Finite-Element Modeling of Spontaneous Potential in an Axisymmetric Reservoir Model with Account of Its Shale Content

(1) This article is devoted to the development of a theoretical and algorithmic basis for numerical modeling of the spontaneous potential method (SP) as applied to the study of sandy-argillaceous reservoirs. (2) In terms of coupled flows, we consider a physical–mathematical model of SP signals from an electrochemical source, with regards to the case of fluid-saturated shaly sandstone. (3) An algorithm for 2D finite-element modeling of SP signals was developed and implemented in software, along with its internal and external testing with analytical solutions. The numerical SP modeling was carried out, determining the dependences on the reservoir thickness and porosity, the amount of argillaceous material and the type of minerals. We performed a comparative analysis of the simulated and field SP data, using the results of laboratory core examinations taken from wells in a number of fields in the Latitudinal Ob Region of Western Siberia. (4) The results of the study may be used either for the development of the existing SP techniques, by providing them with a consistent computational model, or for the design of new experimental approaches

APPLICATION OF MODERN INFORMATION TECHNOLOGIES OF FEEDBACK IN IMPACT MARTIAL ARTS ON THE EXAMPLE OF TAEKWONDO WTF

The article deals with topical issues related to the use of feedback information technologies. Since there are not so many studies on this topic, the review includes information on the example of other sports where research is already being carried out, as well as preliminary own research obtained on the example of athletes of percussion martial arts, taekwondo WTF. The study examines the main parameters of the kinematics of the movement of athletes, the study of which allows us to evaluate their effectiveness, and the magnitude of the impact, primarily when assessing the external side of the load. Feedback information technologies for continuous monitoring of motor activity are currently informative, reliable tools in the work of coaches, the information from which helps to plan the training process and carry out the continuous process of training an athlete both in different periods of the annual cycle and during the recovery period.  Article visualizations

Features of Direct Alkaline Processing of Rare-Metal Ores of the Tomtor Deposit

Исследовано прямое щелочное разложение редкометалльной томторской руды в различных условиях. Установлено, что попутные минералы (алюмофосфаты, карбонаты и сульфиды железа) разлагаются растворами гидроксида натрия и существенно снижают активность оборотного щелочного раствора. Предварительная обработка руды разбавленными отработанными щелочными растворами позволяет разложить алюмофосфаты с частичным переводом их в растворимые формы и устойчивые в щелочных растворах алюмосиликаты. Показано, что значительные колебания выхода в раствор редкоземельных металлов при последующем кислотном выщелачивании кеков щелочного вскрытия связаны с частичным окислением церия кислородом воздухаDirect alkaline decomposition of rare-metal Tomtor ore under various conditions has been studied. It has been established that associated minerals (aluminophosphates, iron carbonates and sulfides) are decomposed by sodium hydroxide solutions and significantly reduce the activity of the circulating alkaline solution. Pre-treatment of ore with dilute spent alkaline solutions makes it possible to decompose aluminophosphates with their partial conversion into soluble forms and aluminosilicates stable in alkaline solutions. It is shown that significant fluctuations in the release of rare- earth metals into solution during subsequent acid leaching of cakes from alkaline opening are associated with partial oxidation of cerium by atmospheric oxyge