The service life of the sleeves and pins used in the production of hollow cylindrical refractories has been a total of 3-20 shifts until the present. This leads to significant downtime of the equipment and material losses related to production of repladement parts. Therefore an: increase in their~life is one of the pressing problems of the maintenance services of refractory plants.The wear of pins and sleeves occurs during pressing and ejection of parts. The amount of wear is different over the height of the part (Fig. i). This is caused by the fact that at the start of pressing the charge of refractory materials practically not compressed by the upper and lower punches, the pressure of the abrasive on the surface of the parts is insignificant, and, as a consequence, the intensity of wear is low. With countermovement of the punches and compression of the refractory material the pressure and securing of the abrasive grains increases, increasing the wear rate, which reaches a maximum value at the concluding stage of pressing. As the result of nonuniformity of wear of the sleeves and the pins the surface of the pressed green part acquires a barrel shape, leading to scrap as the result of formation of transverse cracks on the part of the ejection.A feature of the service of sleeves and pins of molds is the fact that as a rule the height of tubular parts pressed with the use of these parts is three to four times greater than of other forms of refractories. In connection with this the force of friction occurring in ejection of them is substantially greater than, for example, in ejection of a brick. The maximum allowable amount of water of the sleeves in the majority of plants does not exceed 0.5-0.6 mm and of pins 0.3 nun. For plates the same figure is 0.8mm. Therefore even with the use of the same materials the service life of sleeves and pins is less than of plates.At present in practically all refractory part plants carburized 20Kh, 15KhM, and 18KhGT steels are used for production of sleeves and hollow pins with a diameter of more than 80 mm. Investigations made in the direction of optimization of the conditions of chemicothermal treatment of these steels and the structure of the carburized case showed that the maximum wear resistance of the carburized surface of the part is obtained after carburizing at 960~ and hardening from this temperature without intermediate partial cooling [i]. After such a chemicothermal treatment the carburized case contains 60% residual austenite and up to 40% martensite with almost comFlete absence of carbides. The capacity of such a structure for significant hardening during wear (the hardness of the rubbing surface increases from Wear "~< --! 2 $ 4 5 Fig.l. Plan of the compartment of the :!i!~i i:i:}} S mold for pressing of tubular parts: i) ~i:i~ !~:i: 7 upper punch holder; 2) pin; 3) upper i~!i ~': 8 cover; 4) sleeve; 5) upper punch; 6)part; 7) die housing; 8) lower punch; 9 9) lower punchholder; I0) lower cover.ix\x\\\~ 10

of the results of the Ukrainian Championship in rowing on ergometers as a stage of selection for the national team. Abstract. As a result of studies, it was found a positive relationship between the time taken for a distance of 2000 m on an ergometer and the results of competitions on water (2000 m) for highly skilled athletes in rowing (r xy = 0.51-0.78) (P. Mikulic, 2009). Objective: research of the results of competitions in rowing on ergometers among highly qualified rowers with the further identification of factors influencing the time taken to cover a distance of 2000 m. Material & methods: the study analyzed the performance of Ukrainian Championship participants: 11 athletes -Honored Masters of Sports of Ukraine, 14 -Masters of Sports of Ukraine of International Class, 53 -Masters of Sports of Ukraine, 30 -Candidates for Masters of Sports of Ukraine, 2 athletes -with 1 category, 1 -without category. The following methods were used: analysis of scientific sources and protocols of technical results of the Ukrainian Championship in rowing on ergometers. The methods of mathematical statistics that were applied are: Kolmogorov-Smirnov test, determination of the mean and standard deviation, correlation analysis. SPSS package was used for calculations. Results. For athletes of the open category average rowing time on ergometers, determined at a distance of 2000 m, was: for men -376.71 s, for women -437.50 s. Among lightweight athletes it was observed the following results: 401.12 s for men, 465.03 s for women. It was determined that the age of athletes correlates with the time for covering a distance of 2000 m: men -(r = -0.633; p ˂ 0.01), light-weight men -(r = -0.677; p ˂0.05), women -(r = -0.554; p˂0.01), lightweight women (r = -0.618; p <0.05). It was determined the correlation between the body weight of men in the open category and time to overcome the distance of 2000 m and 5000 m: (r = -0.317; p <0.05) and (r = -0.388; p <0.01). The close relationships between the time of overcoming the distance of 2000 m and the distance of 5000 m were found in all groups of athletes: the open category for men (r = 0.928, p <0.01) and women (r = 0.963, p <0.01); lightweight men (r = 0.975, p <0.01) and lightweight women (r = 0.978, p <0.01). Conclusions. Thus, the age of the athlete and sports experience affect the results of competitions on ergometers. It has not been identified any significant effect of body weight on the result of competitions on rowing ergometers, except for male athletes of the open category. The formula of the regression equation is determined, which will allow predicting the time of passing the distance of 2000 m based on the result of the distance of 5000 m

The research focuses on exergaming as an instrument of physical traning for stress tolerance. The purpose of the study is to determine the positive effect of exergaming on two criteria: 1) on stress resistance based on root mean square of successive differences (speed of recovery after physical stress); 2) to combat obesity on the basis of metabolic equivalent of task. The main difference between simple gamer and professional sportsman reaction to the exergaming was developed. For example, exergaming is one of the best types of unloading workout for sportsman and one of the best motivator for more intence workout for simple exergamer. The main categories of exergames classification were reviewed in economic and scientific context of the exergame industry. Main exergaming types include: home, medical, dance and bike exergaming, connect emulation of the sport, role-playing game with gamercize-control and outdoor mobile games. Materials and methods. Nineteen competitions of dance exergaming (World Pump Festival and Just Dance) and eSports League discipline of bike exergaming (Zwift) have been identified in aspects of cybersports. This article is confirmed in 2 experimental researches about: 1) metabolic equivalent of task in main exergaming types and outdoor mobile games in particular; 2) speed of recovery after physical stress. Study of metabolic equivalent of task for the exterior mobile games is based on Ukraine Niantic games community survey (190 members). Results and discussion. Average playing experience for the Niantic games (Ingress, Pokémon Go and Harry Potter: Wizards Unite) community was 4 years (59% ≤5 years and 41% >5 years). The distance travelled during this time was about 7429 kilometers (32% passed more than 10,000 km). Metabolic equivalent of task and body heat balance was modelled on the basis of the survey data and metabolic WHO constants and body heat constants of ANSI standart. Exterior games take 5.65 kkal to 1 kg per 1 day, home fitness exergaming (Power Pad, Let's Yoga, Personal Trainer: Walking) takes 7.14 kkal to 1 kg per 1 day, dance exergames take 7.14-10 kkal to 1 kg per 1 day. In the body heat equivalent, this is 4.1 times more than at rest for home-fitness videogames, 5.75 times more than at rest for dance exergaming and 1.84-2.59 times more than at rest for exterior mobile exergames. Conclusion. Based on the indicators of root mean square of successive differences with the help of Energy Health free platform, the first stage of the research on the influence of outdoor exergames on the formation of stress tolerance was held. Root mean square of successive differences monitoring was carried out for 20 participants (10 Black Sea State University volleyball team members and 10 Niantic game community members). An increase in root mean square of successive differences was recorded for 80% of gamers and 60% of athletes. Moreover, the novelty factor acted precisely in athletes, which indicates long-term effectiveness of outdoor mobile games as an instrument of physical traning for stress tolerance

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