Letteratura scientifica selezionata sul tema "Spee Club"
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Articoli di riviste sul tema "Spee Club"
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Pincott, D., e A. S. Blicblau. "High Speed Golf Ball Impact on a Substrate". Applied Mechanics and Materials 440 (ottobre 2013): 314–19. http://dx.doi.org/10.4028/www.scientific.net/amm.440.314.
Testo completoAbstract (sommario):
This project aims to investigate the effect impacting a high speed golf ball on TiN coated metal plate, a simulated golf club head. It was found that the surface coating caused greater deformation of the golf ball. It can be said that a club with this coating will absorb less energy from the impact. The result of this is that the energy will that was not absorbed by the club threw deformation will remain in the golf ball. This extra energy will be transformed into two forms of kinetic energy. The other will be used up by the forces acting on the ball during flight. This research is important as large golf club and golf ball companies have great interest and motivation to further their understanding of new ways to improve their golf clubs.
2
Harper, T. E., J. R. Roberts e R. Jones. "Driver swingweighting: A worthwhile process?" Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 219, n. 5 (1 maggio 2005): 385–93. http://dx.doi.org/10.1243/095440505x32247.
Testo completoAbstract (sommario):
The concept that golf clubs should have a uniform weight distribution means that manufacturers invest significant time and money tailoring the swingweight of their clubs. If golfers are unable to perceive significant changes in swingweight, however, and the effect of swingweight on club performance is small, the current manufacturing tolerances on swingweight can be widened, allowing time and cost savings in the assembly process. Testing was conducted using 30 skilled golfers each performing ten tee-shots with four differently weighted drivers. Clubhead mass was varied using screwed inserts of different known masses and the effects on impact location and clubhead speed were both measured. Changes to golf club weight distribution, measured using the swingweight concept, were found to have little effect on player performance and, in general, golfers were unable to perceive small changes in club swingweight. Manufacturing tolerances for component masses appear to offer sufficient control over golf club weight distribution, suggesting that mass balancing procedures may be relaxed during club assembly to provide production time and cost savings.
3
Gryc, Tomáš, Jitka Marenčáková, Matěj Brožka e František Zahálka. "GOLF SWING VARIABILITY IN ELITE FEMALE JUNIOR GOLFERS". Lékař a technika - Clinician and Technology 49, n. 3 (19 marzo 2020): 87–91. http://dx.doi.org/10.14311/ctj.2019.3.03.
Testo completoAbstract (sommario):
The aim of the study was to determine the variability of golf swing execution in lower and upper body parameters for two golf clubs. Eleven elite female golfers of junior age volunteered in the study and performed 10 trials with mid-iron and with driver at laboratory conditions. A 3D motion capture system was used to measure the lower and upper body movement parameters and club head speed. To assess variability, the coefficient of variation (CV%) and biological coefficient of variation (BCV%) were calculated. Two-tailed t test was used to identify differences between mid-iron and driver variability for each selected kinematic parameter. Any significant difference in variability of kinematics parameters was found between mid-iron club and driver club. However, for both clubs, we found high stability of performance in timing parameters and of lower limbs kinematic parameters at three selected moments of the golf swing. We conclude that timing stability may be the key to achieve the effective and repeatable golf swing in both golf clubs types and that high intra-individual variability of performance may be due to large age range in the study group.
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Mahmuddin e Lutfia Novtriana Pasaribu. "Different Effects of Bench Dip and Wheelbarrow Training on Swimming Speed in 25 Meters Freestyle KU IV Gading Swimming Club in 2022". Kinestetik : Jurnal Ilmiah Pendidikan Jasmani 7, n. 2 (25 giugno 2023): 380–85. http://dx.doi.org/10.33369/jk.v7i2.27329.
Testo completoAbstract (sommario):
The purpose of this study was to determine the significant effect of the bench dip exercise on the swimming speed of the 25 meter freestyle KU IV Gading Swimming Club in 2022, to determine the significant effect of the Wheelbarrow exercise on the swimming speed of the 25 meter freestyle KU IV Gading Swimming Club in 2022 , and to find out how much difference the bench dip and wheelbarrow exercises have to the swimming speed of the 25 meter freestyle at KU IV Gading Swimming Club in 2022. The research was conducted at the swimming club Gading Swimming Club. In the swimming pool of Villa Gading Mas, the Villa Gading Mas complex, Jl Bajak II, Harjosari II Village, Medan Amplas District. This research will be carried out for 6 weeks and will take place from 09 January 2023 to 17 February 2023. The number of samples in this study amounted to 10 people. This research is a type of experimental research. Research instrument to collect data with a 25 meter swimming speed test. The conclusion of the results of the first hypothesis analysis from the pre-test data and post-test data is that there is a significant effect of Bench Dip training on the 25-meter freestyle swimming speed of KU IV Gading Swimming Club athletes in 2022. In the results of the second hypothesis analysis there is a significant effect on Wheelbarrow exercise on the 25-meter freestyle swimming speed of KU IV Gading Swimming Club athletes in 2022. Furthermore, the results of the third hypothesis analysis show that the Bench Dip exercise has no significantly greater effect than the Wheelbarrow exercise on increasing the 25-meter freestyle swimming speed of KU IV Gading Swimming athletes. Clubs of the Year 2022.
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Sereda, N. V., e D. V. Sanina. "Features of application of digital-marketing tools in the activiyies of fitness clubs in current crisis conditions". Scientific Journal of National Pedagogical Dragomanov University. Series 15. Scientific and pedagogical problems of physical culture (physical culture and sports), n. 5(164) (12 maggio 2023): 124–27. http://dx.doi.org/10.31392/npu-nc.series15.2023.5(164).27.
Testo completoAbstract (sommario):
The article presents the results of the conducted research on the determination of the features of the use of digital marketing tools in the activity of fitness clubs in modern crisis conditions. The reasons for which it is possible to significantly increase the number of consumers of physical culture and sports services in fitness clubs are revealed, taking into account the current crisis conditions and the variability of the macro environment. A description of the features of the application of the web-analysis toolkit of the activity of fitness clubs on the Internet is provided. The relevance and expediency of using digital marketing tools in the activity of fitness clubs, taking into account the change in the macro environment, was established. It was determined that only 34.3% of fitness club employees use periodic advertising on the Internet and 47.6% are active in social networks. The results of the study determined the technological parameters of consumer interaction with the web resource of the fitness club, namely: adaptation for mobile phones, page loading speed, convenience in searching for relevant information.
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Young, Warren, Andrew Russell, Peter Burge, Alex Clarke, Stuart Cormack e Glenn Stewart. "The Use of Sprint Tests for Assessment of Speed Qualities of Elite Australian Rules Footballers". International Journal of Sports Physiology and Performance 3, n. 2 (giugno 2008): 199–206. http://dx.doi.org/10.1123/ijspp.3.2.199.
Testo completoAbstract (sommario):
Purpose:The purpose of this study was to determine the relationships between split times within sprint tests over 30 m and 40 m in elite Australian Rules footballers.Methods:Data were analyzed from two Australian Football League (AFL) clubs. The first club (n = 35) conducted a 40-m sprint test and recorded split times at 10 m and 20 m. The second club (n = 30) conducted a 30-m sprint test and recorded splits at 10 m and 20 m. Analyses included calculation of Pearson correlations and common variances between all the split times as well as “flying” times (20–40 m for the first club and 20 to 30 m for the second club).Results:There was a high correlation (r = 0.94) between 10-m time and 20-m time within each club, indicating these measures assessed very similar speed qualities. The correlations between 10-m time and times to 30 m and 40 m decreased, but still produced common variances of 79% and 66% respectively. However when the “flying” times (20–40 m and 20–30 m) were correlated to 10-m time, the common variances decreased substantially to 25% and 42% respectively, indicating uniqueness.Conclusions:It was concluded that 10-m time is a good refection of acceleration capabilities and either 20 to 40 m in a 40-m sprint test or 20 to 30 m in a 30-m sprint test can be used to estimate maximum speed capabilities. It was suggested that sprint tests over 30 m or 40 m can be conducted indoors to provide useful information about independent speed qualities in athletes.
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Zhang, Xiaoyu, e Junhee Hong. "Analysis on the Present Situation of Golf Vocational Training in China". East Asian Trade Association 4, n. 1 (30 giugno 2022): 47–53. http://dx.doi.org/10.47510/jeat.2022.4.1.47.
Testo completoAbstract (sommario):
Purpose – Golf started on September 30th, 1982, when Zhang Junlin registered and established Shenzhen Golf Club Co., Ltd. in Shenzhen Municipal Market Supervision Administration. In September of the same year, it was approved by Shenzhen Municipal People’s Government. The establishment of the first established golf club in China also marks the official entry of modern golf into the Chinese market. In 1997, Shenzhen University established the first golf major in China, and now there are nearly 600 golf courses in China. China’s golf industry is still developing at a high speed despite policy restrictions. However, there are still some deficiencies in golf vocational training in China. Through the analysis of the shortcomings, the reasonable development direction is put forward.
Design/Methodology/Approach – With the development of golf industry, supporting education has also been carried out in China. Since Shenzhen University, many colleges and universities have also carried out related majors. Golf industry is not limited to golf, but also includes lawn planting, garden art, fashion design, sporting goods manufacturing, hotel management, real estate development, golf education and training, etc., which makes the golf industry bring a variety of jobs and personnel needs. It also makes golf clubs pay more attention to talent cultivation. In this paper, the problems existing in the training of golf talents in clubs and universities are listed and analyzed by means of investigation, to find out the appropriate direction.
Findings – Children are an important member of golf club staff. How to carry out good caddy training and improve caddy’s professional level and comprehensive quality has become the task focus of golf club managers. At present, the common problems of golf caddies in China are: 1. There is no uniform training standard, which makes the quality of caddies uneven. 2. The income of caddies is unstable. 3. Most of the temporary employment relationships between caddies and clubs. 4. Caddy talent reserve can’t meet the needs of club staff. 5. Caddy occupation requires physical condition, and it is difficult to transform after unemployment.
Research Implications – A good teaching foundation is an important way to cultivate talents, and only the mutual communication between clubs and colleges can help improve the ability of golf vocational training in China.
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Li, Weidong, Xuefang Wang e Olli-Pekka Hilmola. "Does High-Speed Railway Influence Convergence of Urban-Rural Income Gap in China?" Sustainability 12, n. 10 (21 maggio 2020): 4236. http://dx.doi.org/10.3390/su12104236.
Testo completoAbstract (sommario):
Transportation is an important factor affecting the balance of regional economic pattern. The construction of high-speed railway enhances the mobility of population, capital, technology and information resources between urban and rural areas. Will it further affect the income gap between urban and rural areas? Based on the nonlinear time-varying factor model, this paper analyzes the convergence of urban-rural income gap with the angle of high-speed railway. After rejecting the assumption of overall convergence in the traditional four economic regions, three convergence clubs of urban-rural income gap were found. For these ordered logit regression model is used to explore the initial factors that may affect the formation of “convergence club”. Empirical results show that the construction of High-speed railway has effectively narrows the urban-rural income gap in China, but it is not the cause of the formation of the three convergence clubs. The convergence effect of High-speed railway on the urban-rural income gap in China is still relatively weak.
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Ekstrand, Jan, Peter Ueblacker, Wart Van Zoest, Raymond Verheijen, Bruno Vanhecke, Maikel van Wijk e Håkan Bengtsson. "Risk factors for hamstring muscle injury in male elite football: medical expert experience and conclusions from 15 European Champions League clubs". BMJ Open Sport & Exercise Medicine 9, n. 1 (gennaio 2023): e001461. http://dx.doi.org/10.1136/bmjsem-2022-001461.
Testo completoAbstract (sommario):
ObjectivesTo describe the perceived importance of suggested hamstring injury risk factors according to chief medical officers (CMOs) of European male professional football clubs. A secondary objective was to compare if these perceptions differed between teams with a lower-than-average hamstring injury burden and teams with a higher than average hamstring injury burden.MethodsFirst, CMOs of 15 European professional male football clubs were asked to suggest risk factors for hamstring injury in their club. The perceived importance of the suggested risk factors was then rated by all participants on a 5-graded Likert scale. Participating teams were divided in two groups depending on their hamstring injury burden during the 2019/2020 and 2020/2021 seasons. The LOW group consisted of seven teams that had a lower than average hamstring injury burden. The HIGH group consisted of eight teams that had a higher-than-average hamstring injury burden.ResultsTwenty-one risk factors were suggested. The majority were extrinsic in nature, associated with coaching staff, team or club rather than players themselves. ‘Lack of communication between medical staff and coaching staff’ had the highest average importance (weighted average=3.7) followed by ‘Lack of regular exposure to high-speed football during training sessions’ (weighted average=3.6). The HIGH group perceived the player factors fatigue and wellness as more important than the LOW group.ConclusionAccording to CMOs recruited in this study, most risk factors for hamstring injuries are extrinsic and associated with the club and coaching staff, and not the players themselves.
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Lafuente, Juan Ángel, Amparo Marco, Mercedes Monfort e Javier Ordóñez. "Social Exclusion and Convergence in the EU: An Assessment of the Europe 2020 Strategy". Sustainability 12, n. 5 (29 febbraio 2020): 1843. http://dx.doi.org/10.3390/su12051843.
Testo completoAbstract (sommario):
Economic convergence has long been a declared objective of the EU and considered the fundamental mechanism for achieving socioeconomic cohesion. The recent economic crisis had an uneven impact across EU countries and brought a halt to the process of economic and social convergence. In response to this situation, the Europe 2020 strategy, launched in 2010, aimed to deliver social and territorial cohesion in the Member States. In this paper we evaluate the poverty and social exclusion pillar of the Europe 2020 strategy by analysing whether it has promoted convergence across the EU countries in the indicators devised to capture risk of poverty, severe material deprivation, and the number of persons living in households with very low work intensity. Our results for all three rates indicate that convergence occurs in heterogeneous clubs that do not follow a geographic east‒west or south‒north pattern. Convergence within each club, especially for the severe deprivation rate, takes place by means of a catching-up process, with Eastern European levels converging on the Western levels. Finally, not only is there club convergence, but there is no tendency for the clubs to convergence. Poverty and social cohesion indicators show a multi-speed Europe, casting doubt on the sustainability of the overall convergence process in the EU.
Tesi sul tema "Spee Club"
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Frennessen, Sebastian. "A comparison of peak trunk rotational power and club head speed in elite golf players". Thesis, Högskolan i Halmstad, Bio- och miljösystemforskning (BLESS), 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-31039.
Testo completoAbstract (sommario):
Abstract Background: Golf is a sport with a growing focus on the physical aspect of the game and its relationship to performance. Studies have determined a correlation between club head speed and performance in golf. Rotational power has proven to be an important factor for the club head speed. By examining the relationship between club head speed and rotational power, researchers has found that rotation power on the golfers dominant side have a moderate to high correlation with club head speed. Previous research has mostly investigated the peak rotational power on the dominant side. Furthermore, additional research is needed to examine the bilateral strength and its relationship to club head speed. Aim: The aim of this study was to examine the correlation between peak trunk rotational power and club head speed in elite golfers, and also to study the impact of bilateral rotational strength on club head speed. Methods: The study included 27 elite golf players (21 males, 6 females) age 19±2 years. The subjects attended two sessions where the first session included a club head speed test and the second session a rotation power test in the Quantum machine. The rotational peak power ratio (dominant/non-dominant side) were ranged from 1-27 (the closer to 1, the higher order) to study a linier relationship with club head speed. Spearman’s nonparametric rank correlations coefficient (rs) was used since the data was not normally distributed. Results: There was a moderate correlation between peak trunk rotational power on the dominant side and club head speed ( rs=0.58, p=0.01). The correlation between the peak trunk rotational powers on the dominant and non- dominant side was high, rs=0.82 (p=0.01). There were no significant correlation found between the ranged rotational peak power ratio and club head speed (rs=0.30, p=0.1). Conclusion: The current study found a slightly lower correlation between peak trunk rotational power and club head speed than found in earlier studies. The golfers in this study had symmetric strength in the trunk, other studies have shown that the rotational strength in golfer´s dominant side were higher than of the non- dominant side. The result of this study indicates that balance between the sides not necessarily has a relationship with how high the golfer’s club head speed is. Future research is needed to analyze the quadratic correlation between ratio and club head speed on a more advanced level. The results of this study can, if validated, be used for further researching and understanding of club head speed and golf performance.
2
Joyce, Christopher. "An Investigation of Technique and Equipment Factors Associated with Clubhead Speed in Golf". Thesis, Edith Cowan University, Research Online, Perth, Western Australia, 2014. https://ro.ecu.edu.au/theses/1439.
Testo completoAbstract (sommario):
If golfers achieve long hitting distances whilst maintaining their accuracy they will gain a competitive advantage. To increase hitting distance, faster clubhead speed is required and this can potentially be achieved through a number of factors. Firstly, anthropometric factors such as height and physical factors such as trunk rotational power have been previously considered to be of importance. However, biomechanical factors such as; the X-factor (separation of the trunk-pelvis alignment when viewed in the transverse plane), have been a major focus of recent research. Further, the interaction of the golfer with the implement they hit with i.e. the golf club has also been examined in biomechanical studies. The broad aim of this doctoral research was to investigate how male high-level amateur golfers generate club head speed and this was examined in a series of five studies that examined technical and equipment factors.
The first study of this thesis (Study I) developed a valid three-dimensional Cardan / Euler model to examine the kinematics of the trunk and lower trunk during the golf swing. This validation study involved; developing and validating models and related algorithms as well as making comparisons to static and dynamic postures. It was concluded that a lateral bending / flexion-extension / axial rotation (ZYX) order of rotation was the most suitable to quantify the X-factor and lower trunk movement in the golf swing.
Previous research has shown conflicting relationships between golf swing kinematics (such as variables related to the X-factor) and clubhead speed, as well as what physical variables assist in generating clubhead speed. The second study of this thesis (Study II) had two aims.
The first aim was to determine whether significant between-club (driver and five-iron) differences existed for trunk and lower trunk kinematics as well as launch conditions. The second aim was to determine which anthropometric, physical and trunk and lower trunk kinematic variables were most strongly associated with clubhead speed. Fifteen high level amateur male golfers (2.5 ± 1.9 handicap) had their trunk and lower trunk three-dimensional kinematics data quantified using the methods developed in Study I. Nine significant (p < 0.002) between-club differences in swing kinematics were found; namely trunk and lower trunk flexion and lower trunk axial rotation, as well as ball velocity. Regression analyses explained 33.7 % and 66.7 % of the variance in clubhead speed for the driver and five-iron respectively, with both trunk and lower trunk variables showing associations with clubhead speed. No anthropometric (i.e. height) or physical (i.e. maximum trunk rotational speed) were associated with clubhead speed.
The low amount of variance explained by clubhead speed for the driver in Study II stimulated further investigation. Studies III and IV were designed to develop a method to locate the kick point during the golf swing and examine the effect of kick point location on swing parameters and their related launch conditions, respectively. Study III involved two phases, Firstly, the level of agreement between two methods of determining the static kick point was determined. This showed that an algorithm using three-dimensional locations of markers placed on the golf club was a valid method to determine the location of the static kick point. In the second phase of testing, this method was used to determine the location of the dynamic kick point during the golf swing. Excellent between-trial reliability was found for this method. Further, differences were found for the dynamic kick point location when compared to the static kick point location. The main objective of Study IV was to determine whether drivers fitted with shafts having high and low kick points would alter selected swing parameters, and related launch conditions. Twelve high level amateur male golfers (1.2 ± 1.8 handicap) had three shots analysed for each of two drivers fitted with “stiff” shafts but these drivers had differing kick point location. Stiffness profiles of these shafts were also measured. Five swing parameters and their related launch conditions were measured using a real-time launch monitor. The driver fitted with the shaft containing the high kick point displayed a more negative (steeper) angle of attack, a lower launch angle and an increased spin rate when compared to a driver fitted with a low kick point
In Study II, a relatively small amount of variance in clubhead speed was explained by the driver and it was the overall intention of the last study of this thesis (Study V) to attempt to explain more of this variance by examining both trunk and wrist kinematics. This was undertaken using two drivers containing differing kick point locations (low and high), with two separate regression models being produced. Twenty high-level amateur male golfers (1.9 ± 1.9 handicap) had their trunk and lower trunk three-dimensional kinematics data quantified as in Study II, but with the addition of a wrist segment. Four significant (p
In conclusion, the methods developed for this thesis to analyse golf swing kinematics revealed a greater insight into how highly skilled golfers produce clubhead speed. Particularly, the results from Studies II and V revealed significant associations between lower trunk related variables and clubhead speed when using different clubs (driver vs. fiveiron) and the same club fitted with two shafts of different kick point location (driver). Also, the methods developed in Studies III and IV to investigate dynamic shaft profiles (deflection) in the downswing provided possible explanations as to how shaft performance in the downswing can influence swing parameters and their related launch conditions at ball impact.
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Wang, Shi-Gung, e 王士剛. "The correlation between sequential movement and club head speed during golf down swing". Thesis, 2002. http://ndltd.ncl.edu.tw/handle/nw98k8.
Testo completoAbstract (sommario):
碩士國立體育學院
教練研究所
90
Will there be different results on the club head speed which concern with the time of ball impacted is earlier or late to the time of maximum vertical force on left foot, and according to Asmussen (1960), the counteraction of gravity is maintained primarily by the back muscle during trunk forward rotation, so will there be different results on the club head speed which is due to the contraction time of latissimus dorsi is prior or late to that of pectoral major? Those points of view pointed out the sequential movement can be checked by time of weight on left foot, impact, and sequential of muscles contraction during down swing. So the intent of this study is to find out the sequential movement of down swing and its affection on the club head velocity. The time between the maximum vertical force on right and left foot named “weight transform phase”, on left foot and impact named “whipping phase”. The start time between latissimus dorsi and pectoral major`s contraction named “time difference of contraction”. Two separate force plates, club head speed meter, EMG and an artificial swing mate on force plate were arranged in laboratory. Samples of vertical force were collected with 1000 Hz rate in Kistler system, speed meter（m/sec）was put on the neck of club head, and the muscles activity data with 1000 Hz rate in Bio-Pac system and AcqKnowledge software were obtained from electrode detectors on latissimus dorsi and pectoral major. Three elite golfers from national team members and four beginners were tested and named A and B group. We found action phase of A group was 0.250 ±0.087 sec and of B group was 0.478 ±0.290sec, reaction phase of A group was 0.058 ±0.01 sec and of B group was 0.049 ±0.25sec sec, time difference of contraction of A group was 0.448 ±0.18 sec and of B group was 0.691 ±0.370 sec and club head speed of A group was 44.83 ±1.14 m/sec and of B group was 37.27 ±3.80 m/sec. Moreover, there were 78 times of B group performing the incorrect sequential movement during down swing which caused the contraction time of pectoral major prior to latissimus dorsi and reduce the club head speed to 28.74±2.02 m/sec. The T test of two groups shown the significant difference on all factors except action phase of B group, and the correlation test of A group shown that action phase, reaction phase, and time difference of contraction were significant related to club head speed(p＜.01). The results shown that the correct sequential movement could increase the club head speed during golf down swing.
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"The Relationship of Club Handle Twist Velocity to Selected Biomechanical Characteristics of the Golf Drive". Doctoral diss., 2014. http://hdl.handle.net/2286/R.I.25851.
Testo completoAbstract (sommario):
abstract: During the downswing all golfers must roll their forearms and twist the club handle in order to square the club face into impact. Anecdotally some instructors say that rapidly twisting the handle and quickly closing the club face is the best technique while others disagree and suggest the opposite. World class golfers have swings with a range of club handle twist velocities (HTV) from very slow to very fast and either method appears to create a successful swing. The purpose of this research was to discover the relationship between HTV at impact and selected body and club biomechanical characteristics during a driver swing. Three-dimensional motion analysis methods were used to capture the swings of 94 tour professionals. Pearson product-moment correlation was used to determine if a correlation existed between HTV and selected biomechanical characteristics. The total group was also divided into two sub-groups of 32, one group with the fastest HTV (Hi-HTV) and the other with the slowest HTV (Lo-HTV). Single factor ANOVAs were completed for HTV and each selected biomechanical parameter. No significant differences were found between the Hi-HTV and Lo-HTV groups for both clubhead speed and driving accuracy. Lead forearm supination velocity at impact was found to be significantly different between groups with the Hi-HTV group having a higher velocity. Lead wrist extension velocity at impact, while not being significantly different between groups was found to be positive in both groups, meaning that the lead wrist is extending at impact. Lead wrist ulnar deviation, lead wrist release and trail elbow extension velocities at maximum were not significantly different between groups. Pelvis rotation, thorax rotation, pelvis side bend and pelvis rotation at impact were all significantly different between groups, with the Lo-HTV group being more side bent tor the trail side and more open at impact. These results suggest that world class golfers can successfully use either the low or high HTV technique for a successful swing. From an instructional perspective it is important to be aware of the body posture and wrist/forearm motion differences between the two techniques so as to be consistent when teaching either method.Dissertation/Thesis
Doctoral Dissertation Exercise Science 2014
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Chen, Yi-Ling, e 陳奕伶. "Differences of trunk rotation and weight transfer patterns when swinging at difference club head speed". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/41726322312900759242.
Testo completoAbstract (sommario):
碩士國立臺灣師範大學
體育學系
101
Purpose: This study investigated the relationship between club head speed and swing movement pattern which included trunk rotation and weight transfer pattern. Methods: Ten golfers (7 males, 3 females, age: 16.9±3.5 years, handicap: 4.5 ±3.17) were recruited to perform two velocity of club head speed: normal club head speed (NS) and accelerated club head speed (AS). The kinematics variables were collected by 3D Vicon Motion Capture System (250Hz), and the kinetic variables were collected by two Kistler foreplates (1000Hz). Paried t test was employed to compare the differences of trunk rotation and weight transfer patterns between normal club head speed and accelerated club head speed. Significant level was set at 0.05. Results: There were several significant differences between AS and NS been found. First of all, AS was found a greater pelvic tilt angle toward anterior at address phase. A greater upper trunk rotation angle and pelvic tilt angle at backswing phase as follow. Next, AS showed larger pelvic side bending angle at top of the backswing phase, smaller pelvic rotation angle and larger X Factor at downswing phase. After that, AS was found greater pelvic rotation angle and greater X Factor at the ball impact phase. Ultimately, AS was found greater pelvic tilt angle at the follow through phase. On the other hand, with the respect of weight transfer pattern, AS were found significant greater VRGF maximum, and were found greater VGRF at the downswing phase. Moreover, there were found greater displacement range of COP with AS, and significantly shift toward toe at the address and downswing phase. Conclusions: We concluded that golfer would adjust their trunk rotation and weight transfer pattern to accelerate the club head speed.
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Silva, Pedro Filipe Correia Rodrigues da. "Relatório do estágio no Laboratório de Otimização do Rendimento do Sporting Clube de Portugal na Época Desportiva 2015/2016 na equipa de futebol Sub-17". Master's thesis, 2020. http://hdl.handle.net/10437/10231.
Testo completoAbstract (sommario):
Orientação: Luís Miguel Rosado da
Cunha Massuça ; co-orientação: Carlos Bruno CharruaO relatório relata o trabalho realizado no departamento de treino das qualidades físicas do Sporting Clube de Portugal (S.C.P.), no Laboratório de Otimização do Rendimento (L.O.R.), na época desportiva 2015/2016, na equipa de futebol Sub-17. O desenvolvimento dos atletas nos seus mais variados parâmetros é o principal objetivo da formação do S.C.P, não só formar atletas, mas acima de tudo formar Homens. Cada departamento tem a sua finalidade no longo processo que é o desenvolvimento dos jovens atletas de futebol. O L.O.R. por sua vez é responsável pelo desenvolvimento das qualidades físicas dos atletas, vulgo ‘’trabalho físico’’. Os seus membros são responsáveis pelo planeamento das sessões de treino, com vista à melhoria das qualidades físicas, recuperação de lesões e de esforços depois dos jogos, aspetos nutricionais, entre outros. Dependendo do escalão em que o atleta se insere, está estipulado um tipo base de trabalho. Nos escalões mais novos, o trabalho centra-se muito na coordenação e com o avançar da idade começa a dar-se primazia a outras vertentes, como a hipertrofia e força máxima, sem nunca descurar as restantes vertentes. Para além do trabalho geral, são realizadas baterias de testes físicos, duas a três vezes ao ano, para se compreender quais as necessidades especificas de cada jogador e dessa forma elaborar um trabalho individual, os testes visam em analisar os índices de força, flexibilidade, resistência e velocidade. Nesta época em concreto foram realizados dois momentos de avaliação, pré-época (Julho) e a meio da época (Março). No fim do ano foi realizada uma análise dos resultados e podemos observar que os atletas melhoraram os parâmetros analisados. Um fato curioso foi que os atletas não residentes na academia tiveram melhores resultados nos testes de força de membros inferiores, ao passo que os atletas residentes melhoraram os resultados dos testes mais ligados ao jogo (velocidade, agilidade e VO2máx).
The goal of this report is showcase the work developed by the department of physical qualities of Sporting CP, taken place on the Lab for Performance Optimization (L.O.R) during the season of 2015/2016, on the U17 team. The development of its athletes and their various skills, is, and has always been, the primary focus of Sporting Clube de Portugal’s academy. In that, is also the aim on bringing up athletes as true Men. Each department has its own specific goal during the long process that is the development of the football athlete. The L.O.R is responsible for the development of the physical attributes of the athletes, in other words, the ‘’physical work’’. Members of these department are responsible for planning training sessions focusing the improvement of physical qualities (PQ), recovering from injuries and postmatch muscle exhaustion, nutritional advice (meal and supplements), plus more. Considering the age level of these athletes, there is a preset work structure method. In the younger teams, much is geared towards team coordination, while later, the focus starts to spread into other traits (adding more without subtracting or lessen already acquired traits), such as, hypertrophy maximum strength. Beyond the general work, two to three times a year, there will be benchmark scoring tests performed to identify specific needs of each player, and as such allowing for a more individual work plan for each athlete, the tests aim to analyze the strength, flexibility, endurance and speed indexes. In this particular season, we carried out two evaluation moments, pre-season (July) and mid-season (March). At the end of the year, an analysis of the results was carried out and we can see which are the best analysis parameters. A curious fact was that nonresident athletes had better results in lower limb strength tests, while resident athletes improved the results of tests more associated with the game (speed, agility and Vo2max).
Libri sul tema "Spee Club"
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Bergkamp, Dennis. Stillness and speed: My story. London: Simon & Schuster, 2013.
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Club, Inverness Field, a cura di. Inverness Field Club study excursion to the mouth of the River Spey. [Inverness]: [Inverness Field Club], 1995.
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Drake, Albert. Brotherhood of speed: History of the Slo Poks Hot Rod Club, Vancouver, U.S.A. Vancouver, Washington: Murphy Hill Farm/Stone Press, 2012.
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Meston, Zach. 3DO Games Secrets: Book Two. Maui, HI: Sandwich Islands Publishing, 1996.
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Hines, James R. England: The Birthplace of Figure Skating. University of Illinois Press, 2017. http://dx.doi.org/10.5406/illinois/9780252039065.003.0002.
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This chapter traces the early development of figure skating in England. Topics covered include the publication of the first skating book entitled The Art of Skating by Robert Jones in 1772; the first skating club, Edinburgh Skating Club; one of the earliest and most important books about skating, George Anderson's The Art of Skating, dating from 1852 and published under the pen name Cyclos; founding of the London Skating Club in 1830; the development of the English style of skating and new turns and figures; the advent of combined skating; the development of speed skating in the agricultural area of the fen country north of London; and establishment of the National Skating Association in 1879.
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United States Auto Club: Fifty years of speed and glory. [Escondido, CA]: Dick Wallen Productions, 2006.
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H. Irving (Harrie Irving) 1 Hancock. Motor Boat Club off Long Island, or, a Daring Marine Game at Racing Speed. Creative Media Partners, LLC, 2021.
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Wilke, Fritz. Branding Speed: How to Market Your Club Racing Team and Create the Image You Want. Independently Published, 2021.
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Wilke, Fritz. Branding Speed: How to Market Your Club Racing Team and Create the Image You Want. Independently Published, 2021.
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Alexander, Ryan. Complete Conditioning for Soccer. Human Kinetics, 2021. http://dx.doi.org/10.5040/9781718214620.
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The future of soccer conditioning has arrived. With content ranging from how to properly develop speed, strength, power, and agility in players at all levels to unique position-specific training guidelines and detailed return-to-play protocols, Complete Conditioning for Soccer is a real game changer. Training protocols and progressions, complete with schematics of on-field conditioning drills, guide conditioning for players from youth to professional levels. Field players of every position will increase strength to dribble through traffic. Forwards will pack more power into shots on goal. Central midfielders will improve quickness and agility to find open passing lanes and evade opponents. Goalkeepers will develop the explosiveness to cover the width of the goal to make that save. Emphasizing player movement and conditioning needs for the long term, you will learn the positional and seasonal demands that directly impact player development and performance and discover the significant differences between playing styles, positions, levels of play, and genders. To keep players game-ready, you’ll find detailed information on avoiding some of the most common soccer injuries as well as step-by-step, position-specific training protocols for players returning from injury. Written by Ryan Alexander, the director of sports science for Atlanta United Football Club (MLS), Complete Conditioning for Soccer takes the process of physical preparation for soccer to a whole new level. AUDIENCE Strength and conditioning coaches and personal trainers who work with soccer players, as well as soccer coaches and players seeking the best ways to condition for the sport.
Capitoli di libri sul tema "Spee Club"
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Sariman, Mohd Hanifa, Nik Nabihah Nik Yusof, Mohd Zulkhairi Azam, Wan Mohd Norsyam Wan Norman e Fatin Aqilah Abdul Razak. "Comparison of Flexibility, Muscular Endurance, and Speed Among Veteran Male Tennis Player Between Clubs". In Regional Conference on Science, Technology and Social Sciences (RCSTSS 2016), 1001–6. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0074-5_98.
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P. O’Brien, Conor. "Leading Wrist Injuries in a Golfing Population. Golf Swing Biomechanics a Significant Cause of Pathology". In Recent Advances in Sport Science [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.96979.
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Golf participation has increased significantly over the past 50 years. Injury rates have mirrored this increase with amateur and elite golfers suffering a similar injury incidence to rugby players. The upper limb is the second most common anatomical site of injury in this population. Wrist injury and specifically the ulnar side of the leading wrist is the most prevalent. Leading wrist injuries affect the tendons, fibrocartilage, bones and neural structures that are located on the ulnar side of the wrist and hand as well as the soft tissue aponeurosis and bony and ligamentous canals that traverse the wrist joint. The most commonly injured lateral wrist structure is the Extensor Carpi Ulnaris tendon. This is particularly liable to injury due to the forces placed on it during the golf swing. Other structures on the medial side of the leading wrist associated with golf related injury and pathology include Triangular Fibro-cartilage, the hamate bone, the bony canals through which the nerves travel, as well as the flexor aponeurosis and Flexor Carpi Ulnaris tendon. Risk injury to the medial aspect of the leading wrist is increased by the newer golfing theories and techniques which endeavour to create increase golf club head speeds by storing greater energy by a phenomenon called “lag”. Lag results in greater speed as the club head releases at impact but results in injury to the medial wrist anatomical structures. Swing biomechanics, and their alteration and augmentation are a major factor in medial wrist injury. Diagnosis of these pathologies requires careful history and examination, as well as the use of radiology and electrodiagnostic medicine to confirm the pathology and degree. Treatment is targeted to the specific disability. Classical treatments are mostly employed and usually involve rest and anti-inflammatory treatments. Newer therapies such as Platelet Rich Plasma injection and Deep Oscillation therapy have proven beneficial. Splinting is often employed on return to play. Early diagnosis and cessation of the offending activity often allays the need for surgery. The rhyme that “minutes to diagnosis means weeks to recovery” is particularly apt for medial wrist golf injuries. Surgery will be required in long standing or chronic cases. Return to play, unlike many sports injuries, will require careful golf biomechanical assessment and alteration in swing dynamics. The objective of this chapter is to identify how the new biomechanical manipulation of the wrist and specifically the leading wrist has resulted in increased injuries to this anatomical structure. The type of injury, diagnosis and treatment is discussed in detail. Club head speed is generated through a combination of improved golf club equipment, golf payer fitness and manipulation of the golf club by the left wrist resulting in increased golf club lag and torque which all contribute to wrist injuries.
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Vorotović, Goran, Nebojša Petrović, Časlav Mitrović e Vesna Šešum-Čavić. "Possibilities of BLOB (Binary Large OBject) and CLOB (Character Large Object) Integration Into the Core of IoT and Using the SQL Platform for Distributing a Large Amount of Data to HTML, JAVA, and PHP Platforms". In Emerging Trends and Applications of the Internet of Things, 235–76. IGI Global, 2017. http://dx.doi.org/10.4018/978-1-5225-2437-3.ch009.
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This chapter identifies and describes the key concepts and techniques for BLOB and CLOB integration into the IoT core. Data system centralization has sped up the solution of problems with large amounts of data storage and processing, particularly if the data is large by its nature. In that sense, everyday stream of photos, audio and video content, large textual data files led to new concepts BLOB and CLOB. Adequate examples of stored procedures, views, C#, JAVA, HTML5 i PHP languages, follow the establishing communication methods. Finally, the chapter will illustrate two practical examples of IoT: the example for pagination on a large database with million BLOB and CLOB objects, and the example for dynamic mechatronic system of a fire truck with feedback.
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Shipton, Alyn. "Horn for Hire". In Groovin’ High, 87–106. Oxford University PressNew York, NY, 1999. http://dx.doi.org/10.1093/oso/9780195091328.003.0007.
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Abstract The legendary status afforded to Minton’s (which was in the basement of the Cecil Hotel at 210 West 118th Street), based on such oral reminiscences as Dizzy’s, has made the club into one of the sacred cows of jazz history. It is celebrated as the place where bebop was forged in the heat of the after-hours jam session, and where the great and the good clamored to sit in. Those with no knowledge of the rhythmic and harmonic changes afoot in bebop were systematically excluded as the musicians on the bandstand played ever more esoteric chord changes and improvised melodic lines built of increasingly complex chordal extensions at greater and greater speed.
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Łukaszewski, Bartosz. "Metody readaptacji młodzieży zagrożonej marginalizacją i wykluczeniem społecznym. Perspektywa empiryczna". In Praca socjalna w perspektywie polityki społecznej, 187–200. Uniwersytet Papieski Jana Pawła II w Krakowie Wydawnictwo Naukowe, 2023. http://dx.doi.org/10.15633/9788363241612.11.
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Following article is focused on the analysis of the methods of youth’s at risk of social exclusion readaptation. In this context in the range of identifying the risky and pro-tective factors there were used the theories such as emerging adulthood, general strain theory (GST) and the resilience category. The empirical layer was based on the results of research carried on the premises of the Youth Club “Alternatywa”, protective-spe-cialistic day care facility. In this light there were used the survey questionnaires which were the base of correlative, inter-variables analysis (statistically significant also), content analysis of the open questions in the questionnaires and the SWOT analysis scheme.
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Fayed, Karim, Birgit Franken e Kay Berkling. "Understanding the use of eye-tracking recordings to measure and classify reading ability in elementary children school". In CALL for widening participation: short papers from EUROCALL 2020, 69–74. Research-publishing.net, 2020. http://dx.doi.org/10.14705/rpnet.2020.48.1167.
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The iRead EU Project has released literacy games for Spanish, German, Greek, and English for L1 and L2 acquisition. In order to understand the impact of these games on reading skills for L1 German pupils, the authors employed an eye-tracking recording of pupils’ readings on a weekly basis as part of an after-school reading club. This work seeks to first understand how to interpret the eye-tracker data for such a study. Five pupils participated in the project and read short texts over the course of five weeks. The resulting data set was extensive enough to perform preliminary analysis on how to use the eye-tracking data to provide information on skill acquisition looking at pupils’ reading accuracy and speed. Given our set-up, we can show that the eye-tracker is accurate enough to measure relative reading speed between long and short vowels for selected 2-syllable words. As a result, eye-tracking data can visualize three different types of beginning readers: memorizers, pattern learners, and those with reading problems.
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Spence, John C. H. "Faraday and Maxwell". In Lightspeed, 91–111. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198841968.003.0006.
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The story of Michael Faraday and the development of field theory in the early nineteenth century and his discovery of the magneto-optical effect, which linked the study of optics and light to electromagnetism for the first time, and led to the discovery of the displacement current. The integration of electrostatics and electromagnetism by James Clerk Maxwell and others. How Maxwell discovered his great equations, which predict a constant speed of light and show that light is an electromagnetic wave. How the symmetry which resulted from his displacement current provided an important clue for Einstein’s theory. Maxwell’s current-charge balance apparatus, which allowed him to measure the speed of light by purely electrical means. How Maxwell’s equations were later used in the discovery of radio waves. Maxwell’s life and interests, from poetry to horse riding and guitar. Kelvin and the laying of the Atlantic cable.
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Smith, Gary. "Intelligent or obedient?" In The AI Delusion. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198824305.003.0003.
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Jeopardy! is a popular game show that, in various incarnations, has been on television for more than 50 years. The show is a test of general knowledge with the twist that the clues are answers and the contestants respond with questions that fit the answers. For example, the clue, “16th President of the United States,” would be answered correctly with “Who is Abraham Lincoln?” There are three contestants, and the first person to push his or her button is given the first chance to answer the question orally (with the exception of the Final Jeopardy clue, when all three contestants are given 30 seconds to write down their answers). In many ways, the show is ideally suited for computers because computers can store and retrieve vast amounts of information without error. (At a teen Jeopardy tournament, a boy lost the championship because he wrote “Who Is Annie Frank?” instead of “Who is Anne Frank.”A computer would not make such an error.) On the other hand, the clues are not always straightforward, and sometimes obscure. One clue was “Sink it and you’ve scratched.” It is difficult for a computer that is nothing more than an encyclopedia of facts to come up with the correct answer: “What is the cue ball?” Another challenging clue was, “When translated, the full name of this major league baseball team gets you a double redundancy.” (Answer: “What is the Los Angeles Angels?”) In 2005 a team of 15 IBM engineers set out to design a computer that could compete with the best Jeopardy players. They named it Watson, after IBM’s first CEO, Thomas J. Watson, who expanded IBM from 1,300 employees and less than $5 million in revenue in 1914 to 72,500 employees and $900 million in revenue when he died in 1956. The Watson program stored the equivalent of 200 million pages of information and could process the equivalent of a million books per second. Beyond its massive memory and processing speed, Watson can understand natural spoken language and use synthesized speech to communicate. Unlike search engines that provide a list of relevant documents or web sites, Watson was programmed to find specific answers to clues. Watson used hundreds of software programs to identify the keywords and phrases in a clue, match these to keywords and phrases in its massive data base, and then formulate possible responses.
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El Naggar, Bassant, e Kay Berkling. "Designing a gamified reading app with pupils in elementary school". In CALL for widening participation: short papers from EUROCALL 2020, 63–68. Research-publishing.net, 2020. http://dx.doi.org/10.14705/rpnet.2020.48.1166.
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Playing games on mobile devices has become an integral part of younger generations’ lives. Mobile games foster, among other things, deep concentration. This paper reports on design guidelines derived from observations of six elementary school pupils’ engagement over a six-week period during an after-school reading club program. Each meeting consisted of three activities as well as reading text on the Microsoft immersive reader on an iPad, and playing a competitive reading game app, ‘Henry rennt’, which are both designed to support reading. Pupils were engaged in informal conversation with the researchers about both applications, and the authors informally observed the pupils’ engagement with the apps and each other. Patterns of engagement and comments from pupils informed the design of a new reading app. This work reports these general patterns and concludes with new research areas to pursue as a result, including the impact of: social setting on playing, in-game teaching with avatars on engagement, and speed as a measurement of skill mastery. Finally, the applicability of children’s engagement patterns is validated with adult students of German as a second language who used the app.
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Siu, Helen F. "The Cultural Landscape of Luxury Housing in South China". In Tracing China. Hong Kong University Press, 2016. http://dx.doi.org/10.5790/hongkong/9789888083732.003.0014.
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This chapter attempts to use the “fever” for luxury housing in post-Mao Guangdong to highlight a historically specific circulation of cultural meanings in the making of a regional landscape. Many regions of China experienced a building boom in the 1990s. Overseas Chinese capital, particularly that from Hong Kong developers, has partially shaped the skyline of coastal metropolitan areas such as Beijing and Shanghai—luxury housing estates, shopping malls, five-star hotels, golf courses, and clubs. Private housing markets in these cities have grown with remarkable speed and intensity, and a large portion of this growth is fueled by government danwei providing units for employees to purchase at subsidized prices. Where private developers enter the market to offer affordable choices, families have explored the “one family two systems” strategy in housing as they have in jobs. One member may explore entrepreneurial ventures while another holds onto state sector allocations for basic security. In pursing their own intimate spaces in a more mobile housing situation that allows residents to straddle state and market, are they redefining social hierarchies that have previously been shaped by bureaucratic agenda and political privilege? Have their notions of place-based identities and loyalties changed by the new housing choices?
Atti di convegni sul tema "Spee Club"
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Campos Calderón, Antonio, e Cristina Solano. "Teenagers science club". In SPIE Optical Engineering + Applications, a cura di G. Groot Gregory. SPIE, 2012. http://dx.doi.org/10.1117/12.930074.
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Mekaouar, Anouar, Chokri Ben Amar e Tanneguy Redarce. "New vision based navigation clue for a regular colonoscope's tip". In SPIE Medical Imaging, a cura di Michael I. Miga e Kenneth H. Wong. SPIE, 2009. http://dx.doi.org/10.1117/12.811340.
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Doyle, P. A. T., M. L. Gorman, S. Howe e I. J. Patterson. "The North Sea Bird Club: Ten Years of Recording in the North Sea". In SPE Health, Safety and Environment in Oil and Gas Exploration and Production Conference. Society of Petroleum Engineers, 1991. http://dx.doi.org/10.2118/23348-ms.
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Wen, Hongwei, Yue Liu, Shengpei Wang, Jishui Zhang, Yun Peng e Huiguang He. "Diffusion tractography and graph theory analysis reveal the disrupted rich-club organization of white matter structural networks in early Tourette Syndrome children". In SPIE Medical Imaging, a cura di Andrzej Krol e Barjor Gimi. SPIE, 2017. http://dx.doi.org/10.1117/12.2254093.
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Yi, Wei, Zhiqiang Gao e Maosi Chen. "Dynamic modelling of future land-use change: a comparison between CLUE-S and Dinamica EGO models". In SPIE Optical Engineering + Applications, a cura di Wei Gao, Thomas J. Jackson, Jinnian Wang e Ni-Bin Chang. SPIE, 2012. http://dx.doi.org/10.1117/12.927781.
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Xue, Yuan, Patrick Cronin, Chengmo Yang e Jingtong Hu. "Fine-tuning CLB placement to speed up reconfigurations in NVM-based FPGAs". In 2015 25th International Conference on Field Programmable Logic and Applications (FPL). IEEE, 2015. http://dx.doi.org/10.1109/fpl.2015.7294013.
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Li, Kun, Wei Si, Jingjie Sha e Yunfei Chen. "Molecular Dynamics Study of DNA Translocation Through Graphene Nanopores With Controllable Speed". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50858.
Testo completoAbstract (sommario):
All-atom steered molecular dynamics (SMD) simulations provide the means to study the single-stranded DNA (ssDNA) translocation through graphene nanopores at a controllable speed. The ssDNA is pulled by an elastic force similar to the manipulation by an AFM tip. At the same time, an electric field is applied across the reservoir along the direction of the pulling force, in order to hold the ssDNA strand taut and drive the ions in the solutions through the nanopore. By monitoring and analyzing the average ionic current blockage of poly(dA)10, poly(dC)10, poly(dG)10 and poly(dT)10, it is found that one can indeed discriminate the different DNA bases from each other by holding each nucleotide in the pore for sufficiently long time. It is obtained the average blocked ionic currents can be listed, in a increasing order, as IG<IA<IT, which is almost in agreement with the order of sizes of the four nucleotides (VG>VA>VT>VC), apart from C. The results indicate that physical occupancy of the nucleotide plays the major role in affecting average blocked ionic current when the DNA translocation speed is effectively slowed down. This work provides a clue for the further investigation to realize the discrimination of the four nucleotides by the method of actively controlling DNA molecule translocation speed through the nanopores.
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Kobayashi, M., H. Ogata, T. Oda, R. Matsuyama, A. Horikawa, Y. Kinoshita e Hitoshi Fujiwara. "Improvement on Ignition Performance for a Lean Staged Low NOx Combustor". In ASME 2011 Turbo Expo: Turbine Technical Conference and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/gt2011-46187.
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KHI (Kawasaki heavy industries Ltd, Japan) and JAXA (Japan Aerospace Exploration Agency) have been working together since 2004 to improve lean staged concentric fuel injector technologies. One of the weak points of a lean staged fuel injector is said to be ignition / light around performance. Ignition characteristics were assessed on several fuel injector configurations in burner tests. Laser diagnosis, CFD analysis and high-speed video camera recording were used to understand the effect of fuel injector geometry on fuel spray distribution and ignition characteristics. They showed a clear relationship between the burner geometry and ignition characteristics. Light around characteristics was evaluated with the burner configuration optimized in burner tests. Light around performance deteriorated in multi sector unit compared to that in burner test. CFD analysis and some ignition tests with different configuration of combustor gave a clue to restore the light around characteristics deteriorated in multi sector unit.
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Masaki, Daisaku, e Shojiro Kaji. "Numerical Analysis of Transonic Compressor Rotor Flow Near Stall Points". In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-068.
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A three-dimensional Navier-Stokes solver based upon a high resolution shock-capturing scheme has been developed in order to analyze complex flow phenomena inside transonic fan/compressor rotors, especially tip clearance flow. The aim of this research is to find out a key element concerned with aerodynamic instability of transonic fan/compressor rotors such as rotating stall and surge by using this newly developed numerical tool. The numerical analysis of this research is twofold. First it investigates the flowfield of a transonic compressor rotor along the design speed operating line. It obtains definite flow structures around the tip region and clear description of the transition of the flow pattern inside the clearance gap between operating points, which shows that shock-tip leakage vortex interaction plays an important role on both loss generation and the failure of steady flow, or surge. A model will be proposed on the onset of tip stall in transonic compressor rotors according to the calculated results. Secondly, the above model will be examined through a series of numerical experiments by altering tip clearance height white keeping the design speed. From qualitative point of view, the model works fairly well and seems geometry-independent for typical transonic fan/compressor rotors. A clue to the optimum clearance is also obtained.
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Oprea, Bogdan, Vladimir Potop, Niculina-Liliana Mihailescu e Ion Mihaila. "Caracteristicile zonelor de efort în jocul de fotbal la copiii de 10 ani". In Congresul Ştiinţific Internaţional "Sport. Olimpism. Sănătate". State University of Physical Education and Sport, Republic of Moldova, 2022. http://dx.doi.org/10.52449/soh22.35.
Testo completoAbstract (sommario):
The purpose of the research is to determinethe weight of the effort zones by monitoring the heart rate and themovement speedof the 10-year oldchildren during the football game. A number of 14 football players aged 10 years, from the School Sports Club no. 1 Pajura, Bucharest, participated in the research. The children, with a weight of 29.95±0.95 kg and a height of 137.7±1.89 cm, were divided into two groups: experimental group (n=7) and control group(n=7). The players from both groups were assigned to positions, namely: Goalkeeper and Central Defender, Offensive Central Defender, Central Midfielder, Right Midfielder , Left Midfielder andForward. The research was carried out inAugust 2022, at the ”Biruința” Sports Center of Bucharest, on a 60/40 m sized playing field, according to thestandard dimensionsgiven by the Bucharest Municipal Football Association. To monitor the effort zones in the football game, Vantage V – Polar FlowSync watch-type functional measurement systems were applied to the experimental group. The research results show the monitoring of the movement distance in training sessions, the heart rate (HR) average, maximum and minimum value and the average and maximum travel speedin the 1st and the 2nd half.There arehighlighted the dynamics of the recoveryin the 1st and the 2nd half and the graph of the individual values, as well as the relationship of the effort zones weight depending on the intensity of the HR and the movement speed.Thus, the analysis of the changes in HRand movement speed contributedto the determination of the characteristics of the effort zones specific to each football playing position in the children aged 10 years.