scholarly journals Pedagogičeskie osobennosti postroeniâ učebnyh makrociklov silovoj napravlennosti on trenažere «Soncept–2» in sportsmenov edinoborcev

2019 ◽  
Vol 65 (2) ◽  
pp. 348-352
Author(s):  
Oleksandr Chumachenko ◽  
Oleksandr Kozubenko ◽  
Volodymyr Pilnenkij
Keyword(s):  
High Speed ◽  
Control Group ◽  
Physical Culture ◽  
Leg Strength ◽  
Maximum Test ◽  
Medium Speed ◽  
Methodical Approach ◽  
Special Power ◽  
Effective Transfer ◽  
Auxiliary Factor

In this preparation of the sportsmen of êdinoborcìv has been included in the training process of exercises on Simulator «Concept–2». This dependence is related to the fact that the athletes êdinoborcâm need to perform common power exercises on simulators to increase training volume of corresponding capacity. Sources of literature do not disclose data integrated power preparation êdinoborcìv using vesluvalnih simulators, so study the allowable amounts of load simulator «Concept–2» is the unsolved problem of the modern physical culture and Sport. Sports training is a system that is constantly being improved based on the accumulation of new data, experimental research, best practices and scientific and technical progress. For testing and training athletes êdinoborcìv, as well as to increase the level of physical disability of different population groups are widely used vesluvalnì ergometers «Concept–2», etc. An auxiliary factor for improving the general preparedness of athletes of single-fighters is the development of highly specialized manifestations of force, which determine the capabilities of the development of the necessary effort and its abilities in the process of training and competitive activities. A key element in the formation of specialized power qualities of wrestlers is the effective transfer of this motor quality in the transition from the preferential use of the PROF. In this regard, the formation of a methodical approach, based on which is the improvement of special power capabilities, as an integrated component of the system of functional training of single-team fighters, becomes actual. Analysis of special literature and practice of strength training in martial arts gave reason to speak about the possibility of solving this problem using special training devices that stimulate the development of power abilities, provided that the main groups of muscles are included and the main elements of the structure of the competitive exercise are preserved. In this case, the interest is an analysis of the method of using a specialized power simulator «Dyno-Concept». It is recommended to use a rowing simulator to assess the strength of athletes of single-team with the exercise of traction sitting for the upper limbs and foot press for the lower extremities in three modes: I (damper simulator fully open) – manifestation of power capabilities at high speed; II-th – (open half of the flaps) – the manifestation of the optimal ratio of the speed and power component at medium speed; III (damper of the simulator is completely closed) – manifestation of maximum force at low speed. In the second mode, half of the flaps were opened. To evaluate special strength endurance – maximum test 2000 m. Application of the methodology of the development of force using the specialized simulator «Сoncept–2 Dyno» allows you to get a higher rate of growth of the developing quality. In the experimental group, the strength of the hands was 5%, leg strength – 2,8%, strength endurance increased by 2,2%; in the control group, respectively, 1.4%, 1.2% and 1%.

Maximum Temperature Through a Yttrium Stabilized Zirconia Ceramic After Er,Cr:YSGG Laser Irradiation

2020 ◽  
Vol 02 ◽  
Author(s):  
Laurel Stringer ◽  
Sarah Malley ◽  
Darrell M. Hutto ◽  
Jason A. Griggs ◽  
Susana M. Salazar Marocho
Keyword(s):  
High Speed ◽  
Potential Method ◽  
Maximum Temperature ◽  
Zirconia Ceramic ◽  
Tooth Pulp ◽  
Control Group ◽  
Stabilized Zirconia ◽  
Significant Difference ◽  
Power Setting ◽  
Group A

Background: The most common approach to remove yttria stabilized zirconia (YSZ) fixed-dental prostheses (FDPs) is by means of diamond burs attached to a high-speed handpiece. This process is time-consuming and destructive. The use of lasers over mechanical instrumentation for removal of FDPs can lead to efficient and predictable restoration retrievability. However, the heat produced might damage the tooth pulp (>42˚C). Objective: The purpose of this study was to determine the maximum temperature (T) reached during the use of different settings of the erbium, chromium:yttrium-scandium-gallium-garnet Er,Cr:YSGG laser through a YSZ ceramic. Methods: YSZ slices (1 mm thick) were assigned into 7 groups. For the control group, a diamond bur was used to cut a 1 mm groove into the YSZ slices. For the 6 experimental groups, the laser was operated at a constant combination of 33% water and 66% air during 30 s with two different power settings (W) at three frequencies (PPS), as follows (W/PPS): 2.5/20, 2.5/30, 2.5/45, 4.5/20, 4.5/30, 4.5/45. The T through the YSZ slice was recorded in degrees Celsius by using a digital thermometer with a K thermocouple. Results: The median T of the control group was 26.5˚C. The use of 4.5 W resulted in the median T (˚C) of 44.2 at 20 PPS, 53.3 at 30 PPS, and 58.9 at 45 PPS, while 2.5 W showed 34.6, 31.6, and 25.0 at 20, 30, and 45 PPS, respectively. KruskalWallis one-way ANOVA showed that within each power setting, the T was similar. The high power and lowest frequency (4.5/20) showed no significant difference from the 2.5 W settings and the control group. Conclusion: The lower power setting (2.5 W) is a potential method for the use of the Er,Cr:YSGG laser to debond YSZ structures. The higher power (4.5 W) with high frequencies (30 and 45 PPS) is unsuitable.

High-speed railway and tourism development in China

2021 ◽  
pp. 135481662199852
Author(s):  
Shujie Yao ◽  
Xu Yan ◽  
Chun Kwok Lei ◽  
Feng Wang
Keyword(s):  
High Speed ◽  
Tourism Development ◽  
Policy Implications ◽  
Control Group ◽  
Difference In Differences ◽  
Transportation Mode ◽  
High Speed Railway ◽  
Model Cities ◽  
Large Panel ◽  
Research Findings

High-speed railway (HSR) is a new and increasingly popular transportation mode in China bringing about a significant impact on the economy, including tourism development. This article investigates the effect of HSR on tourism development in China based on a time-varying difference-in-differences model. Cities connected by HSR in 2013 and 2014 are regarded as the treatment group, while those without HSR services until 2017 are placed in the control group. The empirical analyses cover a large panel dataset comprising 163 cities in 2009–2017. The empirical results suggest that both domestic tourism revenue and tourist number are positively affected by HSR, and the effect is stronger for the undeveloped or geopolitically less important regions such as the inland or prefecture-level cities. Other relevant determinants of tourism include the availability of airports and the number of hotels in the cities. Our research findings have important policy implications for tourism development in China with respect to HSR.

scholarly journals Features of Physical Preparation of Students for Passing the GTO Standards

2021 ◽  
Vol 4 (4) ◽  
pp. 22-26
Author(s):  
Oksana Anatolevna Sbitneva
Keyword(s):  
Physical Fitness ◽  
Physical Training ◽  
High Speed ◽  
Effective Means ◽  
Educational Process ◽  
Physical Culture ◽  
Successful Implementation ◽  
Positive Trend ◽  
Gradual Change ◽  
Educational Potential

The article deals with the problems of motor activity, the development of physical qualities and speed abilities of students. The importance of physical culture and physical fitness is revealed. The search for effective means and methods of physical culture in preparation for passing the GTO standards is analyzed. The features of physical training of high-speed orientation of students to pass the GTO standards for speed are considered. The effectiveness of the use of speed-oriented exercises, which are necessary for students to achieve the norms of the GTO complex for speed, within the framework of physical culture classes, is revealed. Research methods. In the course of the study, a comparative analysis of the results was carried out. The method of control tests was used. The overall assessment of the effectiveness of the above tools and methods is expressed in positive dynamics. The results of the study. According to the results of the study, there is a positive trend. The analysis of the results according to the table of GTO standards in the framework of physical culture classes allows us to note the growth of indicators for all established tests. Systematic classes using high-speed, high-speed and power-oriented exercises with a gradual change in the load, improving the technique of performing exercises, contribute to the development of the physical quality «speed». Conclusions. Regular physical education classes with the use of speed exercises contribute to the development and improvement of physical qualities, the achievement of growth rates of GTO standards. The level of readiness of students to fulfill the norms and requirements of the GTO complex at the average level. Affordable, effective means and methods of physical training make it possible to actively use the scientific and educational potential of the university. The purposeful organization of the educational process contributes to achieving the proper level of physical fitness necessary for the successful implementation of the regulatory requirements of the AR PCS Complex GTO.

scholarly journals The Effect of 8 Weeks of Zumba Exercıse on Flexbılıty and Some Strength Parameters in Women Aged 25-45

2021 ◽  
Vol 15 (7) ◽  
pp. 2180-2184
Author(s):  
Mehmet Murat Beyaz ◽  
Gökçe Oktay
Keyword(s):  
Exercise Program ◽  
Strength Parameter ◽  
Control Group ◽  
Muscular Endurance ◽  
Leg Strength ◽  
Lower Extremity Strength ◽  
Significant Difference ◽  
Before And After ◽  
Post Test ◽  
Experimental Group

The aim of this study is to examine the effects of 6-week Zumba exercises on flexibility, leg strength, back strength and muscular endurance parameters in women aged 25-45. The research group consists of a total of (n=20) women, (n=10) in the experimental group and (n=10) in the control group, between the ages of 25-45 living in Istanbul. The participants in the experimental group were given 60 minutes of Zumba exercises 3 days a week for 6 weeks, and sit-reach, 1-minute sit-up and strength test measurements were made to the participants before and after the exercise program. Participants in the control group were not included in any exercise program. As a result of the analysis, it was determined that there was a statistically significant difference between the participants' flexibility, leg strength, back strength and muscular endurance values between the pre-test and post-test within the group (p< 0.05). In addition, there was no significant difference between the pre-test and post-test values between the groups (p< 0.05). In conclusion; It was determined that zumba exercises applied to the experimental group did not have a significant effect on flexibility, muscular endurance and back strength. In the leg strength parameter, the effect of zumba exercises applied to the experimental group on leg strength was found to be significant at a rate of 34%. In the light of these data, it was concluded that zumba exercises performed in sedentary women have a positive effect on lower extremity strength. Keywords: Zumba Fitness, Exercise, Women and Exercise

PHYSICAL DEVELOPMENT OF CHILDREN OF PRESCHOOL AGE

2020 ◽  
Vol 18 (Suppl.1) ◽  
pp. 903-907
Author(s):  
T. Traykova
Keyword(s):  
Body Weight ◽  
Physical Development ◽  
Preschool Age ◽  
Chest Circumference ◽  
Control Group ◽  
Physical Culture ◽  
Educational Content ◽  
Anthropometric Parameters ◽  
Basic Parameters ◽  
Experimental Group

Purpose of the study: To register the dynamics of the basic parameters of the physical development of children from the fourth preparatory group, as a result of the implementation of an enriched educational content in physical culture pedagogical situations. 54 girls and 67 boys were investigated and measured twice – at the beginning and at the end of the pedagogical experiment. Anthropometric parameters assessed: height, body weight, chest circumference. Methods: Theoretical analysis, pedagogical experiment, anthropometry, statistical methods. Results: Height: the highest increase in that parameter was found in the Experimental Group of boys and the smallest one – in girls of the Control group. Body weight: boys from the EG showed the highest increase, while the lowest one was found in boys from CG. Chest circumference: the greatest increase was measured in CG of, while the smallest one in the EG of girls. In conclusion, we can underline that the changes in the anthropometric parameters are due both to the laws of biological developments of children at that age, as well as to the applied enriched educational content.

Realization of a Fully Optically Accessible Medium Speed Large Bore Engine Using a Fisheye Optic

2020 ◽  
Author(s):  
Stephan Karmann ◽  
Christian Friedrich ◽  
Maximilian Prager ◽  
Georg Wachtmeister
Keyword(s):  
High Speed ◽  
Optical Measurement ◽  
Measurement Techniques ◽  
Combustion Process ◽  
Engine Operation ◽  
New Approach ◽  
Medium Speed ◽  
Starting Point ◽  
Nominal Load ◽  
Fire Engine

Abstract To address one of the main environmental concerns, the engine out emissions, an enhanced understanding of the combustion process itself is fundamental. Recent optical and laser optical measurement techniques provide a promising approach to investigate and optimize the combustion process regarding emissions. These measurement techniques are already quite common for passenger car and truck size engines and significantly contribute to their improvement. Transferring these measurement techniques to large bore engines from low to high speed is still rather more uncommon especially due to the bigger challenges caused by the engine size and thus much higher stability requirements and design effort for optical accessibility. To cover this new field of research a new approach for a medium speed large bore engine was developed using a fisheye optic mounted centrally in the cylinder head to design a fully optically accessible engine test bench. This new approach is detailed with a test setup layout and a stability concept consisting of cooling systems and the development of a suitable operation strategy based on simulation and experimental verification. The design of this single cylinder engine with 350mm bore and 440mm stroke providing 530kW nominal load at 750 rpm was tested up to 85% nominal load in skipped fire engine operation mode. The measurements of the flame chemiluminescence of a dual fuel combustion of the diesel gas type present proof of the feasibility of the new design as a starting point for future systematic studies on the combustion process of large bore engines.

scholarly journals Transient Characterization of Automotive Exhaust Emission from Different Vehicle Types Based on On-Road Measurements

Atmosphere ◽  
2020 ◽  
Vol 11 (1) ◽  
pp. 64 ◽  
Author(s):  
Chao Ma ◽  
Lin Wu ◽  
Hong-jun Mao ◽  
Xiao-zhen Fang ◽  
Ning Wei ◽  
...  
Keyword(s):  
High Speed ◽  
Exhaust Emissions ◽  
Particulate Filter ◽  
Specific Power ◽  
Vehicle Emission ◽  
Emission Rates ◽  
Automotive Exhaust ◽  
Nucleation Mode ◽  
Medium Speed ◽  
High Emission

Previous works on real-world vehicle emission characteristics have mainly focused on the influences of fuel, speed, vehicle type, elevation, and other factors on vehicle emission quantity and components. However, few studies have investigated the transient trend of automotive exhaust emissions through on-road measurements. The key objective of the present paper was to examine the transient characteristics of exhaust emissions from different vehicle types on the roads of Tianjin. To achieve the goal, a portable emission measurement system (PEMS) was employed to monitor emissions from selected test vehicles—private cars, passenger vehicles, and cargo vehicles. It was found that the high-emission points of test vehicles were mainly distributed in two regions: the high-speed region (speed > 70–90 km/h, vehicle-specific power (VSP) > 0 kW/t) and the medium-speed–acceleration region (20–30 km/h < speed < 60–90 km/h, 0 kW/t <VSP < 12 kW/t). The CO, hydrocarbon (HC), NOx, and particulate number (PN) average emission rates in the high-emission points could be 3.15–14.93 times, 1.93–24.89 times, 3.23–6.03 times, and 3.22–30.27 times of those of average emission rates. The HC, NOx, and PN average emission rates of China IV vehicles in the high-emission points were 2.46–4.92 times, 3.56–6.03 times, and 3.22–13.21 times of those of average emission rates, not less than those of China III (1.93–2.52 times, 2.75–3.90 times, and 9.98–22.34 times). Test vehicles mainly emitted nucleation-mode and Aitken-mode particles, and the increase of the PN concentration emission rate in low-speed and high-speed regions was higher than that in the medium-speed region. The exhaust gas recirculation (EGR) + diesel particulate filter (DPF) could effectively inhibit the Aitken output caused by turbocharged intercooler (CIC). The selective catalytic reduction (SCR) might cause more nucleation-mode particles.

Training with unilateral resistance exercise increases contralateral strength

2005 ◽  
Vol 99 (5) ◽  
pp. 1880-1884 ◽  
Author(s):  
Joanne Munn ◽  
Robert D. Herbert ◽  
Mark J. Hancock ◽  
Simon C. Gandevia
Keyword(s):  
Confidence Interval ◽  
Resistance Exercise ◽  
High Speed ◽  
Statistical Power ◽  
Elbow Flexion ◽  
Maximum Load ◽  
Control Group ◽  
Repetition Maximum ◽  
Low Speed ◽  
Initial Strength

Evidence that unilateral training increases contralateral strength is inconsistent, possibly because existing studies have design limitations such as lack of control groups, lack of randomization, and insufficient statistical power. This study sought to determine whether unilateral resistance training increases contralateral strength. Subjects ( n = 115) were randomly assigned to a control group or one of the following four training groups that performed supervised elbow flexion contractions: 1) one set at high speed, 2) one set at low speed, 3) three sets at high speed, or 4) three sets at low speed. Training was 3 times/wk for 6 wk with a six- to eight-repetition maximum load. Control subjects attended sessions but did not exercise. Elbow flexor strength was measured with a one-repetition maximum arm curl before and after training. Training with one set at slow speed did not produce an increase in contralateral strength (mean effect of −1% or −0.07 kg; 95% confidence interval: −0.42–0.28 kg; P = 0.68). However, three sets increased strength of the untrained arm by a mean of 7% of initial strength (additional mean effect of 0.41 kg; 95% confidence interval: 0.06–0.75 kg; P = 0.022). There was a tendency for training with fast contractions to produce a greater increase in contralateral strength than slow training (additional mean effect of 5% or 0.31 kg; 95% confidence interval: −0.03–0.66 kg; P = 0.08), but there was no interaction between the number of sets and training speed. We conclude that three sets of unilateral resistance exercise produce small contralateral increases in strength.

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