bluuebunny/crossref_metadata_2025_split huggingface dataset:
The basics of theory and methods of mastering the game of table tennis in the classroom physical education of students
Authors: Arkhipov O.A. , Arkhipov S.O. , Garmata O.M. 
Published: March 2024

How to master the game of table tennis in physical education classes. At the beginning of your classes, you need to get acquainted with how the racket interacts with the ball, "feel" the racket and the ball, learn to control its flight in different ways, master the basic striking movements, master the orientation of the torso, arms, legs and racket in space, etc.
Purpose: to analyze the essence and significance of the stages of table tennis training in physical education classes: (special physical training; technical training, techniques; tactical training; psychological training).It is important to learn how to hold the racket correctly and perform various exercises with the racket and ball off the table, as this will help you master the technique of the game faster. In this case, it is recommended to use the following exercises: moving around the court, holding the ball on the racket and watching the grip, rolling the ball on the racket from one edge to the other or in a circle, repeatedly hitting the ball with different sides of the racket from the bottom up or alternately with one and the other side of the racket, strive to keep the ball from falling to the ground as long as possible (should be performed both in place and in motion); driving the ball with the racket, hitting the floor (dribbling), in the player's stance on the spot or in motion; to give the ball rotation with both sides of the racket in different directions: from the body to the right or left; to hit the ball with a racket to different heights in turn - high bounce, low bounce; crouching and standing up, to hit the ball: hit - crouch, hit again - stand up.
When playing on the table, you need to pay attention to the correctness of your movements. The basics of the technique can be properly mastered and consolidated only with repeated repetition of technical elements in a game environment on the table, and the prerequisites for this are practicing the technique with the help of imitation exercises. In the future, a lot depends on coordination of movements, musculoskeletal sensitivity, attentiveness, reaction speed, as well as the level of development of such qualities as endurance, perseverance, dedication and efficiency.
Development of flexibility of young men of 22-35 years old who are engaged in capoeira
Authors: Vlasiuk Olena , Shkarupilo Pavlo , Soroka Olena 
Published: March 2024

Taking into account a wide arsenal of means of physical training which are used during training sessions of capoeira, it can be referred to the list of the brightest and the most various types of martial arts. This greatly influences the choice of capoeira exercises by young Ukrainians as a means of physical education. Traditionally, one of the defining physical qualities on the way to mastering complex coordination exercises in capoeira is flexibility. The insufficient level of its development leads to a lack of technique. This negatively affects the motivation to train and the final result. Therefore, today, it is important to develop and implement a system of classes that promote the development of flexibility in the training process of capoeirists.
The purpose of the study: to experimentally substantiate the system of flexibility development of men of the first mature age engaged in capoeira. Methods of the research. To achieve this goal we used the following methods: analysis and generalization of scientific and methodical literature and documentary materials; pedagogical observation; pedagogical experiment; methods of mathematical statistics. The research was conducted on the basis of the capoeira school "RABO DE ARRAIA" (Dnipro) with men aged 22-35 years. The results of a preliminary study of the level of flexibility development showed an average level of its development, as well as a level below average. Scientific novelty of the study. The system of development of flexibility of capoeiristas of 25-35 years old, with the predominant use of exercises: without an object, with an object and in pairs, was experimentally substantiated. Conclusions. The experimental system involved the performance of exercises without an object, with an object and in pairs, which alternated each training session; in the experimental group; after twelve weeks of training according to the author's system of flexibility development, a significant increase in all test indicators is observed.
Use of means of restoration of working capacity in preparation sprinters
Authors: Maleniuk T. , Babalich V. , Panchenko G. 
Published: March 2024

The purpose of the work: to analyze and systematize modern data on the use of means of rehabilitation of athletes specializing in short-distance running. Methodology: theoretical analysis and generalization of scientific and methodological literature and Internet resources.
Scientific novelty. A comprehensive approach to the use of modern means of restoring the working capacity of sprinters is presented, the effectiveness of which depends on the period of preparation in the annual cycle, specialization, volume, intensity and direction of training loads of previous and subsequent classes, microcycles, etc.Conclusions. It was noted that among the pedagogical means of recovery, it is important to use motor switching in training programs and microcycles in the form of sports games. To manage the performance of runners, selective recovery of those components that were not primarily affected during the training session, but will be mobilized during the next training session, should be carried out. It is recommended to use the entire complex of pedagogical tools for the rational construction of the sports training process. Extra-training (physical) means of recovery in the preparatory and competitive periods of the annual training of sprinters are proposed. It is recommended that track and field athletes use complexes of physical and hygienic means of recovery of the general effect after performing significant training loads, and for medium and small loads - of local effect. Pharmacological means of recovery of athletes depending on the functional state of muscles, the size and intensity of training loads are presented. The positive effect of nutrition on the course of restorative processes is indicated.
Directions of modernization of professional training of future specialists in physical culture and sports in conditions of martial law
Authors: Rybalko Lina 
Published: March 2024

The professional training of future specialists in physical education and sports in institutions of higher education (hereinafter referred to as higher education institutions) in the conditions of martial law is an urgent problem today. Despite the large number of works devoted to the study of various aspects of the training of future specialists, it is worth stating that the study of the professional training of future specialists in physical culture and sports in the conditions of martial law requires special attention of scientists and practitioners.
The purpose of the work: revealing the peculiarities of the professional training of future specialists in physical culture and sports in the conditions of martial law, highlighting the main directions of modernization of this process.
Research has proven that modern requirements for physical culture and sports specialists are significantly different from those that existed a few years ago. Curricula as well as work programs for educational disciplines need to be updated in the aspect of increased attention to modern health systems, various innovative forms of physical activity, in particular, national-patriotic sports and folk games among schoolchildren and students.
The article reveals the conceptual apparatus of the researched topic, the structure and content of the professional training of future specialists in physical culture and sports, identifies and characterizes the directions of its modernization. It has been established that the process of training future specialists in physical culture and sports under martial law needs not only renewal, but also modernization. The areas of modernization of the professional training of future teachers of physical education are highlighted and characterized: conducting effective career orientation work; update of educational and methodical literature on educational disciplines for higher education applicants in specialty 017 Physical culture and sport; introduction of innovative forms and methods of education into the educational process.
The use of modern fitness technologies in the physical education of students
Authors: Serhata Natalia , Sergaty Mykola 
Published: March 2024

The article examines the variety and expediency of fitness classes with students of various specialties, shows the impact of such classes on the state of health of students, as well as the peculiarities of conducting fitness classes. One of the problems of physical education in universities is insufficient interest of young people in physical education. There is a problem between the need to form a physically healthy specialist during training and the lack of motivation of students engaged in physical education and sports, the need to change the format of conducting physical education classes using new approaches and new technologies.
The use of fitness technologies in the physical education of students will have a positive effect on their motivational sphere, which in turn will affect the improvement of indicators of physical and mental condition, academic performance and the formation of a healthy lifestyle of students. culture in the university, in the formation of a healthy lifestyle of students.
The article examines the state of the issue in scientific and methodical literature, summarizes the experience of using fitness technologies in the educational process. The effectiveness of fitness technology programs in physical culture for students of various specialties at the university is shown.
The introduction of elements of fitness technologies into educational classes increases students' interest in physical culture, stimulates their independent work. Planning classes with elements of fitness for young men can be based on sports and recreational fitness technologies (athletic gymnastics, crossfit, mixed programs, fitness yoga, specialized programs of athletic gymnastics, circular fitness training, adapted mixed programs). For girls of the main group, fitness yoga, athletic gymnastics, step aerobics, mixed programs can be chosen; for girls of the adaptive group – fitness yoga, billiards, pilates, athletic gymnastics.
Component Relevant Creep Damage in Tempered Martensitic 9 to 12 %Cr Steels
Authors: Parker Jonathan 
Published: March 2024

Abstract
Creep brittle behaviour in tempered martensitic, creep strength enhanced ferritic (CSEF) steels is linked to the formation of micro voids. Details of the number of voids formed, and the tendency for reductions in creep strain to fracture are different for the different CSEF steels. However, it appears that the susceptibility for void nucleation is related to the presence of trace elements and hard non-metallic inclusions in the base steel. A key factor in determining whether the inclusions present will nucleate voids is the particle size. Thus, only inclusions of a sufficient size (the critical inclusion size is directly linked to the creep stress) will act directly as nucleation sites. This paper compares results from traditional uniaxial laboratory creep testing with data obtained under multiaxial conditions. The need to understand and quantify how metallurgical and structural factors interact to influence creep damage and cracking is discussed and the significant benefits available through the use of high quality steel making and fabrication procedures are highlighted. Details of component behaviour are considered as part of well-engineered, Damage Tolerant, design methods.
Application of Inconel 740H to Pipe Transition Joints in Advanced Power Plant
Authors: Moody P. , Barnard P. , Dauda T. , Baker B.A. , Gollihue R.D. 
Published: March 2024

Abstract
INCONEL 740H has been developed by Special Metals for use in Advanced Ultra Super Critical (A-USC) coal fired boilers. Its creep strength performance is currently amongst the ‘best in class’ of nickel based alloys, to meet the challenge of operating in typical A-USC steam temperatures of 700°C at 35 MPa pressure. Whilst the prime physical property of interest for INCONEL 740H has been creep strength, it exhibits other physical properties worthy of consideration in other applications. It has a thermal expansion co-efficient that lies between typical values for Creep Strength Enhanced Ferritic (CSEF) steels and austenitic stainless steels. This paper describes the validation work in support of the fabrication of a pipe transition joint that uses INCONEL 740H pipe, produced in accordance with ASME Boiler Code Case 2702, as a transition material to join P92 pipe to a 316H stainless steel header. The paper gives details of the material selection process, joint design and the verification process used for the joint.
Precipitate Phase Stability and Compositional Dependence on Alloying Additions in Advanced Ni-Base Superalloys
Authors: Antonov S. , Detrois M. , Tin S. 
Published: March 2024

Abstract
Modern polycrystalline Ni-base superalloys for advanced gas turbine engines have been a key component that has contributed to technological advances in propulsion and power generation. As advanced turbine engine designs are beginning to necessitate the use of materials with temperature and strength capabilities beyond those exhibited by existing materials, new alloying concepts are required to replace conventional Ni-base superalloys with conventional γ-γ’ microstructures. The phase stability of various high Nb content Ni-base superalloys exhibiting γ-γ’-δ -η microstructures have been the subject of a number of recent investigations due to their promising physical and mechanical properties at elevated temperatures. Although high overall alloying levels of Nb, Ta and Ti are desirable for promoting high temperature strength in γ-γ’ Ni-base superalloys, excessive levels of these elements induce the formation of δ and η phases. The morphology, formation, and composition of precipitate phases in a number of experimental alloys spanning a broad range of compositions were explored to devise compositional relationships that can be used to predict the microstructural phase stability and facilitate the design of Ni-base superalloys.
Development of Ni-Base Superalloy USC141 for 700°C Class A-USC Boiler Tubes
Authors: Uehara Toshihiro , Sato Naoya , Shimizu Masaru , Schraven Patrik 
Published: March 2024

Abstract
Recently, a γ’ precipitation strengthened Ni-base superalloy, USC141, was developed for 700°C class A-USC boiler tubes as well as turbine blades. In boiler tube application, the creep rupture strength of USC141 was much higher than that of Alloy617, and the 105 hours’ creep rupture strength of USC141 was estimated to be about 180MPa at 700°C. This is because fine γ’ particles precipitate in austenite grains and some kinds of intermetallic compounds and carbides precipitate along austenite grain boundaries during creep tests. Good coal ash corrosion resistance is also required for tubes at around 700°C. It is known that coal ash corrosion resistance depends on the contents of Cr and Mo in Ni-base superalloys. Therefore the effect of Cr and Mo contents in USC141 on coal ash corrosion resistance, tensile properties, and creep rupture strengths were investigated. As a result, the modified USC141 containing not less than 23% Cr and not more than 7% Mo showed better hot corrosion resistance than the original USC141. This modified alloy also showed almost the same mechanical properties as the original one. Furthermore the trial production of the modified USC141 tubes is now in progress.
Power Austenite- A Novel σ-Phase Hardened High Temperature Alloy for 700 °C (1292 °F) Fired Boilers
Authors: Spiegel Michael , Schraven Patrik 
Published: March 2024

Abstract
The article gives a brief overview of the newly developed austenitic material “Power Austenite”. The microstructure of the Power Austenite is characterized by grain boundary strengthening with boron stabilized M23(C,B)6 and secondary Nb(C,N) in combination with sigma phase and Nb(C,N) as the major grain strengthening precipitates. The material shows a significant creep strength at 700 °C (1292 °F) and 650 °C (1202 °F) as well as fireside corrosion resistance which makes it a possible candidate for 700 °C (1292 °F) power plants.
Creep Behavior and Microstructural Evolution of Super 304H
Authors: Sanders Paul G. , White Calvin L. , Seguin Daniel J. , Raju Kada Sitarama , Shingledecker John P. 
Published: March 2024

Abstract
Long-term creep tested specimens of the advanced austenitic stainless steel Super 304H were subjected to detailed metallographic analysis with an emphasis on the relationship between creep induced cavities (voids) and microstructural features. The creep specimens were tested between 873 and 973 K (600 and 700°C) at stresses between 110 and 340 MPa, with rupture times up to ~1.8 x 108 s (50,000 hours). To characterize damage, the distributions of creep cavities along the length of the gage section were determined and microstructural features associated with the cavities were investigated using optical microscopy and scanning electron microscopy.
Steelmaking Challenges to Achieve Grade 91 with Ultra-Low Impurity Content
Authors: Mariani P. , Marinari A. , Donati M. , Arrigoni M. 
Published: March 2024

Abstract
Grade 91 steel has achieved broad acceptance within the modern boiler industry to fabricate a variety of critical pressure components including tubing, piping and headers, particularly in Ultra Super Critical (USC), Advanced Ultra Super Critical (A-USC) and Combined Cycle Power Plants (CCPP). The applications for which this material is used enforce severe requirements on strength, corrosion, creep properties and thermal stability during service. The properties of Creep Strength Enhanced Ferritic steels (CSEF) such as Grade 91 are critically dependent on manufacturing factors like steelmaking, heat treatments and welding: poor control of these parameters can severely compromise material properties. In scientific literature, several studies correlate low creep ductility to high content of trace elements such As, Sn, Sb, Pb, Cu, P and S. Since the current reference Codes, namely ASTM/ASME, don’t require particular restrictions for these elements, Electric Power Research Institute (EPRI) has issued guidelines for grade 91 which enforce a significant reduction of impurities and trace elements. This paper discusses steelmaking operating challenges to produce Grade 91 steel with very low contents of the above mentioned residual elements, starting from the furnaces charges, up to the chemical composition measuring equipment used in the steel shop laboratories.
Effect of Ductility on Load-Stress Conversion Factor of Small Punch Creep Test
Authors: Komazaki Shin-ichi , Ohkawa Yuya , Yonemura Mitsuharu 
Published: March 2024

Abstract
Remaining-life assessment of high temperature components using the small punch (SP) creep testing technique necessitates the evaluation of SP load (F)/uniaxial stress (σ) conversion factor, F/σ, obtained by comparing the SP and uniaxial creep test results. In the present study, the SP creep tests were carried out at 850°C on various Ni-base alloys having different reduction of area in the range of 0.05-0.67 to investigate the influence of creep ductility on the value of F/σ. The F/σ value was determined for each alloy by correlating SP creep rupture data with corresponding uniaxial creep ones. The experimental results revealed that the F/σ value was not well correlated with Vickers hardness, but it increased almost linearly with increasing reduction of area up to around 0.4. This result indicated that the SP creep rupture data could be converted to the uniaxial data if the creep ductility on a given material was available.
Development of Low Thermal Expansion Fe-Ni-Cr Austenitic Heat Resistant Steel for High Temperature Steam Turbine
Authors: Oinuma Shun , Takaku Reki , Nakatani Yujiro , Imai Kiyoshi , Yamada Masayuki , Kubo Takahiro 
Published: March 2024

Abstract
Austenitic heat resistant steels are one of the most promising materials to be applied around 650°C, due to its superior creep strength than conventional ferritic steels and lower material cost than Ni based superalloys. The problem of austenitic steels is its high thermal expansion coefficient (CTE), which leads to high deformation and stress when applied in rotors, casings, blades and bolts. To develop low CTE austenitic steels together with high temperature strength, we chose the gamma-prime strengthened austenitic steel, A-286, as the base composition, and decreased the CTE by introducing the invar effect. The developed alloy, Fe-40Ni-6Cr-Mo-V-Ti-Al-C-B, showed low CTE comparable to conventional ferritic steels. This is mainly due to its high Ni and low Cr composition, which the invar effect is prone even at high temperature region. This alloy showed higher yield strength, higher creep rupture strength and better oxidation resistance than conventional high Cr ferritic steels and austenitic steels. The 2 ton ESR ingot was forged or hot rolled without defects, and the blade trial manufacturing was successfully done. This alloy is one of the best candidates for USC and A-USC turbine components.
The Influence of Surface Quality of Grade 91 Tubing on Long-Term Oxidation in Steam
Authors: Gorman David M. , Fry Antony T. 
Published: March 2024

Abstract
Oxide scale formation in the inner bore of steam tubing has been identified as a key metric for determining operational parameters and life expectancy of modern boiler systems. Grade 91 tubing is commonly used for the construction of key components within boiler systems designed for power generation operating in the temperature range of 500 to 650 °C. Standard laboratory test procedures involve grinding the surface of test coupons to homogenise their surface structure and improve experimental consistency, however, data presented here shows a discrepancy between laboratory and industrial practices that has long term implications on scale growth kinetics and morphological development. Microstructural analysis of both virgin and ex-service tubing reveals the presence of a pre-existing oxide structure that is incorporated into the inwardly growing scale and is implicated in the formation of multiple laminar void networks. These void networks influence thermal diffusivity across the scale and may function as regions of spallation initiation and propagation.