Academic literature on the topic 'Back somersault with twisting'
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Journal articles on the topic "Back somersault with twisting"
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Dullin, Holger R., and William Tong. "Twisting Somersault." SIAM Journal on Applied Dynamical Systems 15, no. 4 (2016): 1806–22. http://dx.doi.org/10.1137/15m1055097.
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Walton, James S. "Dr. Richard C. Nelson: The Penn State Biomechanics Laboratory and Its Impact on My Career." Journal of Applied Biomechanics 37, no. 6 (2021): 596–600. http://dx.doi.org/10.1123/jab.2021-0300.
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In 1967, as an undergraduate gymnast, I developed an interest in the mechanics of twisting somersaults. In 1969, after expressing a desire to measure and model human motion in a doctoral program, I was advised that Dr Richard “Dick” Nelson was starting a unique program in biomechanics of sport at Penn State University. In September 1970, I was the fourth or fifth doctoral student to join the new program. In 1972, I photographed a cluster of 18 golf balls hung from a 4′ × 8′ sheet of plywood in Dick’s new biomechanics laboratory. The question: “Could I create a 3-dimensional scale that would allow me to locate these golf balls in 3 dimensions?” From these early beginnings, I went on to develop the mathematical foundation for “motion capture” and a career as an entrepreneur and scientist working in a very wide variety of industrial environments in the United States and abroad. Much of my success can be traced back to the 4 years I spent on the Penn State campus. Dick’s efforts in the late 60s and his persistence in the early 70s, and later, were instrumental in creating a new discipline: “Biomechanics of Sport.” Dick: Thank you.
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Yeadon, Maurice R. "Twisting Double Somersault High Bar Dismounts." Journal of Applied Biomechanics 13, no. 1 (1997): 76–87. http://dx.doi.org/10.1123/jab.13.1.76.
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At the 1988 Seoul Olympic Games, four double somersault dismounts with one twist and four double somersault dismounts with two twists were filmed using two 16 mm cameras during the men's horizontal bar competitions. Contributions to tilt angle reached at the midtwist position, determined using computer simulations based on modifications of the data obtained from film, were used as measures of the twisting potential of various techniques. The amount of tilt produced was greater when total twist was greater and when the body was tucked rather than straight. The twisting techniques used varied with the timing of the twist within the two somersaults. Contact contributions were larger when there was more twist in the first somersault. When there was little or no twist in the first somersault, the major contribution came from aerial techniques that comprised mainly arm movements and asymmetrical hip movements in the flight phase.
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Tong, William, and Holger R. Dullin. "A New Twisting Somersault: 513XD." Journal of Nonlinear Science 27, no. 6 (2017): 2037–61. http://dx.doi.org/10.1007/s00332-017-9403-4.
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Marinšek, Miha, and Ivan Čuk. "EFFECTS OF DIFFERENT LEG LOADINGS AT TAKE-OFF ON LANDING CHARACTERISTICS IN TWISTING SOMERSAULTS." Science of Gymnastics Journal 11, no. 3 (2019): 289–98. http://dx.doi.org/10.52165/sgj.11.3.289-298.
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The purpose of the study was to determine whether take-off asymmetry affects landing asymmetry. Eleven male gymnasts performed forward and backward somersaults with 1/2, 1/1, and 3/2 twists. The leading leg for each participant was defined according to the twisting direction. Ground reaction forces under each foot were measured with Parotec insoles. Absolute and relative measures of lateral asymmetry were used as dependent variables. Three-way ANOVA and a series of one-way ANOVAs were used to determine the main effects between take-off and landing. A series of paired t-tests with Bonferroni corrections were used to find differences between the leading and non-leading legs. Maximal ground reaction forces showed that the leading leg was set out to a higher load at take-off than the non-leading leg for twisting somersaults. There were no statistically significant differences found in the maximal ground reaction force between the legs at landings. Index of bilateral asymmetry indicated landings with negligible asymmetry. However, the maximal force differences between the legs in somersault 3/2 were higher when compared to other somersault variations. No evidence was found to affirm that the asymmetry at take-off affects asymmetry at landing in a twisting somersault. Presumably, gymnasts can take corrective measures during the aerial phase of the twisting somersault that effectively diminish the tilt of the body and enable gymnasts to prepare for the landing with small proportional asymmetry. Prudence is required as these proportions rise in the quantity of load with the height of the somersault.
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KAMON, Masayuki, and Kazuo YOSHIDA. "Dynamic Analysis of Twisting Somersault Motions." Transactions of the Japan Society of Mechanical Engineers Series C 69, no. 680 (2003): 1072–79. http://dx.doi.org/10.1299/kikaic.69.1072.
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Sanders, Ross H., and Barry D. Wilson. "Angular Momentum Requirements of the Twisting and Nontwisting Forward 1 1/2 Somersault Dive." International Journal of Sport Biomechanics 3, no. 1 (1987): 47–62. http://dx.doi.org/10.1123/ijsb.3.1.47.
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This study investigated the in-flight rotation of elite 3m springboard divers by determining the angular momentum requirement about the transverse axis through the divers center of gravity (somersault axis) required to perform a forward 1 1/2 somersault with and without twist. Three elite male divers competing in the 1982 Commonwealth Games were filmed using high-speed cinematography while performing the forward 1 1/2 somersault in the pike position and the forward 1 1/2 somersault with one twist in a free position. The film was digitized to provide a kinematic description of each dive. An inclined axis technique appeared to be the predominant means of producing twist after takeoff from the board. The angular momentum about the somersault axis after takeoff was greater for the forward 1 1/2 somersault with twist than the forward 1 1/2 somersault without twist for all three divers. The difference in angular momentum between the two dives of each diver ranged from 6% to 19%. The most observable difference between the dives during the preflight phases was the degree of hip flexion at takeoff. There was more hip flexion at takeoff in 5132D than 103B for all three divers. This difference ranged from 9° to 18° (mean = 14°).
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Yeadon, Maurice R. "Twisting Techniques Used in Freestyle Aerial Skiing." International Journal of Sport Biomechanics 5, no. 2 (1989): 275–81. http://dx.doi.org/10.1123/ijsb.5.2.275.
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At the 1988 Calgary Winter Olympics, six triple somersaults with three twists or four twists were filmed using two cameras. Angles describing body configuration and orientation were determined and were used as input into a computer simulation model of aerial movement. It was found that the twist angle of each simulation deviated from the corresponding angle obtained from film by less than 0.08 revolutions during the first somersault of each movement. Contributions to the tilt angle after one somersault were determined using simulations based on modifications of the film data. It was found that of the six competitors, two initiated the twist during the takeoff phase, two initiated the twist during the aerial phase, and two used a combination of both methods.
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Yeadon, Maurice R. "Twisting Techniques Used in Dismounts from the Rings." Journal of Applied Biomechanics 10, no. 2 (1994): 178–88. http://dx.doi.org/10.1123/jab.10.2.178.
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At the 1992 Olympic Games six full twisting double somersault dismounts were recorded with two video cameras during the rings individual apparatus finals in the men's Artistic Gymnastics competition. Angles describing body configuration were determined from video data and were input, together with initial orientation angle values and angular momentum components, into a computer simulation model of aerial movement. Mean absolute deviations between simulation and video after the completion of one half twist were 0.01 rev for somersault, 2.8° for tilt, and 0.08 rev for twist. When the estimate of the initial tilt angle was adjusted by up to 1° these deviations fell to 1.6° for tilt and 0.02 rev for twist. All 6 competitors produced the majority of the tilt using aerial techniques that were predominantly asymmetrical movements of the arms. Contributions to the subsequent removal of tilt were determined using reverse simulations, and again arm movements were the main contributors.
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Mkaouer, Bessem, Monèm Jemni, Samiha Amara, Helmi Chaabène, Johnny Padulo, and Zouhair Tabka. "Effect of Three Technical Arms Swings on The Elevation of the Center of Mass During a Standing Back Somersault." Journal of Human Kinetics 40, no. 1 (2014): 37–48. http://dx.doi.org/10.2478/hukin-2014-0005.
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Abstract Arms swing during standing back somersaults relates to three different “gymnastics schools”, each is considered “optimal” by its adepts. In the three cases, technical performance, elevation and safety differ. Therefore, the aim of this study was to compare the mechanical variables of three different arms swing techniques in the performance of a standing back tucked somersault. Five high-level male gymnasts (age: 23.17±1.61 yrs; body height: 1.65±0.05 m; body mass: 56.80±7.66 kg) randomly performed standing somersaults under three conditions, each following a different arms’ swing technical angle (270°, 180° and 90°). A force plate synchronized with a three dimensional movement analysis system was used to collect kinetic and kinematic data. Significant differences were observed between somersaults’ performance. The back somersault performed with 270° arms swing showed the best vertical displacement (up to 13.73%), while the back somersaults performed with 180° arms swing showed a decrease in power (up to 22.20%). The back somersault with 90° arms swing showed the highest force (up to 19.46%). Considering that the higher elevation of the centre of mass during the flight phase would allow best performance and lower the risk of falls, this study demonstrated that optimal arms’ swing technique prior to back tucked somersault was 270°.
Dissertations / Theses on the topic "Back somersault with twisting"
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Mikl, Joanne. "All Spun Out - Limits of aerial techniques when performing somersaults." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/15375.
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The somersault is a key skill in gymnastics and diving. Almost all the rotation required must be performed while the athlete is airborne; whilst airborne the athlete’s angular momentum is constant. The postures chosen, and any postural change that occurs while airborne, will determine the rotation achieved by the athlete. Equations are derived that describe the possible rotational states in terms of the somersault and twist rotation, thereby determining which rotational states are possible and useful for performing somersaults and twisting somersaults. Equations describing the results of idealised postural changes intended to initiate twist in a somersault are also derived. Inertial property data was both collated from the literature and estimated from measurements of current athletes. The data thus represented a range of ‘possible athletes’ which were applied to the derived equations of motion to predict which skills are achievable using different postures and actions. Recommendations were made as to the ‘best’ twist initiation actions and postures to use for different somersault skills. For twisting somersaults it was shown that previously published aerial techniques, and slight variations of these, are inadequate to allow the majority of athletes to achieve the highest numbers of twists per somersault observed in current international competition. It was concluded that contact twist or aerial techniques yet to be mathematically described must be used. Based on the predictions of skills achievable it was clear that some athletes have a natural advantage over others. Further, it was found that the postures or techniques which were the ‘best’ for one athlete were not necessarily the ‘best’ for all athletes. Differences in predicted skill achievement and which posture or technique was most suitable varied with the gender and squad (related to age and years of training) but these categories did not explain all of the variation.
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Tong, William. "Coupled Rigid Body Dynamics with Application to Diving." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14577.
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Platform and springboard diving is a sport involving athletes falling or jumping into a pool of water, usually while performing acrobatic manoeuvres. At the highest level it challenges the physical laws of gravity as athletes try to outperform each other by executing more sophisticated dives. With a mathematical model we are able to assist the athletes and coaches by providing some insight into the mechanics of diving, which hopefully gives them an edge during competition. In this thesis we begin with an introduction to rigid body dynamics and then extend the results to coupled rigid bodies. We generalise Euler's equations of motion and equations of orientation for rigid bodies to be applicable for coupled rigid bodies. The athlete is represented as a mathematical model consisting of ten simple geometric solids, which is used to conduct three projects within this thesis. In the first project we look at somersaults without twists, which provides a significant reduction as the model becomes planar. The equations of motion and equations of orientation reduce from vector form to a single scalar differential equation for orientation, since angular momentum is conserved. We digitise footage of an elite diver performing 107B (forward 3.5 somersault in pike) from the 3m springboard, and feed that data into our model for comparison between the theoretically predicted and observed result. We show that the overall rotation obtained by the athlete through somersault is composed of two parts, the major contribution coming from the dynamic phase and a small portion from the geometric phase. We note that by modifying the digitised dive slightly we can leave the dynamic phase intact, but change the geometric phase to provide a small boost in overall rotation. The technique involved in doing so is not practical for actual diving though, so we move away from this idea and devise another way of optimising for the overall rotation. We find that by shape changing in a particular way that takes slightly longer than the fastest way of moving into and out of pike, the overall rotation achieved can be improved by utilising the geometric phase. In the second project we use the model to simulate divers performing forward m somersaults with n twists. The formulas derived are general, but we will specifically look at 5132D, 5134D, 5136D, and 5138D (forward 1.5 somersaults with 1, 2, 3, and 4 twists) dives. To keep the simulation as simple as possible we reduce the segment count to two by restricting the athlete to only using their left arm about the abduction-adduction plane of motion. We show how twisting somersaults can be achieved in this manner using this simple model with predetermined set of motor actions. The dive mechanics consist of the athlete taking off in pure somersaulting motion, executing a shape change mid-flight to get into twist position, perform twisting somersaults in rigid body motion, and then executing another shape change to revert the motion back into pure somersaulting motion to complete the dive. In the third and final project we use our model to show how a 513XD dive (forward 1.5 somersaults with 5 twists) is performed. This complicated dive differs from all currently performed dives in that once the diver initiates twist in the somersaulting motion via shape change, they need to perform another appropriately timed shape change to speed up the twist rather than stopping the twist, and only then is five twists obtainable with practical parameters. Such techniques can be found in aerial skiing where the airborne time is longer, but our theory shows that it may also be applicable to platform and springboard diving too. To date, no athlete has ever attempted a 513XD in competition, nor does the International Swimming Federation (FINA) cover dives with five twists in their degree-of-difficulty formula. Our theory shows that 513XD dive is theoretically possible, and with extrapolation we estimate it would have a degree-of-difficulty of 3.9.
Books on the topic "Back somersault with twisting"
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Munster, Pamela. Twisting Fate: My Journey with BRCA--From Breast Cancer Doctor to Patient and Back. Experiment LLC, The, 2018.
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Twisting fate: My journey with BRCA--from breast cancer doctor to patient and back. 2018.
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Verne, Jules. Around the World in Eighty Days. Translated by William Butcher. Oxford University Press, 2008. http://dx.doi.org/10.1093/owc/9780199552511.001.0001.
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Having assured the members of London’s exclusive Reform Club that he will circumnavigate the world in 80 days, Fogg – stiff, repressed, English – starts by joining forces with an irrepressible Frenchman, Passepartout, and then with a ravishing Indian beauty, Aouda. Together they slice through jungles, over snowbound passes, even across an entire isthmus – only to get back five minutes late. Fogg faces despair and suicide, but Aouda makes a new man of him, able to face even the Reform Club again. Around the World in Eighty Days (1872) contains a strong dose of post-Romantic reality plus extensive borrowing from the author’s own Journey to England and Scotland – but not a shred of science fiction. Its modernism lies instead in the experimental literary technique, with parallel plots, a narrator constantly made to look foolish, four characters in search of their own unconscious, and a unique twisting of space and time. Verne's classic, a bestseller for over a century, has never appeared in a critical edition before. William Butcher's stylish new translation moves as fast and as brilliantly as Fogg’s own journey.
Book chapters on the topic "Back somersault with twisting"
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"back twisting." In The Fairchild Books Dictionary of Textiles. Fairchild Books, 2021. http://dx.doi.org/10.5040/9781501365072.916.
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Hartigan, John. "Interlude." In Care of the Species. University of Minnesota Press, 2017. http://dx.doi.org/10.5749/minnesota/9780816685301.003.0006.
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On one of my last days in Guanajuato, I visit the botanical garden and nature reserve, El Charco Ingenio, outside San Miguel de Allende. Driving from Ciudad Guanajuato, I climb up from the city (2,000 meters), through the mountains, rising up into the woodlands of pine and live oak (2,500 meters). This is likely the route Sessé and Mociño followed as they searched these mountains for plants they had not yet collected. The scent of pines is strong and sweet, the road narrow and twisting. I catch glimpses of the rocky soils of eroding lava cores until, once through the high pass, the terrain slowly morphs into savanna plains starting back around 2,000 meters. My colleague, geographer Karl Butzer, described this terrain as “Rough hill country and uplands, normally formed by ignimbrites tuffs with duricrusts, or lavas, appears to have had a medley of vegetation types, with scattered woodlands of mesquite or acacia, probably open” (1997, 162). Along the way, the car radio crackles with ...
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Iyer, Dr Sai. "PERFORMANCE BASED ASSESSMENT AND ITS ASSOCIATION WITH PAIN AND DISABILITY IN PATIENTS WITH CHRONIC LOW BACK PAIN." In Futuristic Trends in Medical Sciences Volume 3 Book 24. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bdms24p1ch8.
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Since 1990, the global burden of disability associated with low back pain is increasing continuously in all the age groups. The disability rate was highest in the age 50-54 in 2019. Working age group (20-65 years) people had the highest burden of disability about 70%. The prevalence and people living with LBP have been increasing continuously until the age of 80-89 years the greatest number of people with LBP globally are currently in the 50-54 year age group. Global Burden of Disease studies have defined LBP as “pain in the posterior aspect of the body from the lower margin of the twelve ribs to the lower gluteal folds with or without pain referred into one of the lower limbs that last for at least one day. Persistence of pain/symptoms for more than 3 months is defined as chronic. Appropriate tools for measuring mobility and activities of daily living was recently characterized as a priority for research by an international task force on back pain. Timed tests of activities such as walking, sit-tostand task, and repeated trunk flexion have been examined in patients with back pain and shown to have what we consider acceptable reliability, and to be sensitive to change over time. Decreased mobility of the trunk often is considered a Manifestation of low back pain includes decreased mobility of trunk and limitations of activities like, bending, twisting, stooping, crouching, lifting, dressing, picking up objects from floor. Research states that performance based tests used in patients with low back pain is used in determining functioning and activity limitations. The most common outcome measure used in chronic low back pain is ODI, a self-reported questionnaire.
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Lucas, Peter W. "The Evolution of the Hominin Diet from a Dental Functional Perspective." In Evolution Of The Human Diet. Oxford University PressNew York, NY, 2006. http://dx.doi.org/10.1093/oso/9780195183474.003.0003.
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Abstract No other part of the modern human body suffers from disruptions as our mouths; they are so frequently diseased that an entire health profession, dentistry, specializes in them. Its various parts do not seem to fit together properly. The teeth, which develop in the jaws, often have insufficient space to erupt into its cavity. This causes rotation, twisting, tilting, impaction, and sometimes even a reversal of development, where even if some tooth germs form, they fail to mineralize and are resorbed. All this has been documented very thoroughly in dental journals along with a battery of techniques for coping with these problems. What have not been thoroughly examined are the root causes or the functional consequences of these disturbances, basically because the dentition tends to be treated as semiredundant. The dental profession adopts treatment protocols that are protective of dental state and of structures known to be vulnerable, notably the temporomandibular joint, but has done relatively little to investigate dental function in a broad context. Yet it is not just dentists who feel this way. Physical anthropologists have long regarded the size reduction of the dentition in the genus Homo (Brace, Rosenberg, and Hunt, 1987; Calcagno and Gibson, 1991) as indicative of its gradual loss of function due to increased tool use (Brace, 1963, 1964). Recently, Wrangham and colleagues (1999) have suggested that cooking, rather than tool use, explains a trend toward the reduction of tooth size as far back as 1.9 million years ago.
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Senthilkumar, Dr S., Dr S. Rajasekar, and Dr S. Jeyakumar. "AN ERGONOMICS FOR PHOTOGRAPHERS WITH PREVENTION OF MUSCULOSKELETAL DISORDERS." In Futuristic Trends in Medical Sciences Volume 3 Book 13. Iterative International Publishers, Selfypage Developers Pvt Ltd, 2024. http://dx.doi.org/10.58532/v3bdms13p1ch3.
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Photography is a visually captivating profession that requires photographers to spend extended periods in physically demanding positions. The repetitive and prolonged movements involved in capturing mages can lead to musculoskeletal disorders (MSDs) if proper ergonomic practices are not followed. This article aims to provide an overview of ergonomics for photographers and the prevention of MSDs. The key focus of ergonomics for photographers is to optimize body posture, reduce physical strain, and minimize the risk of injury. This can be achieved through various measures such as maintaining proper body alignment, using well-designed camera equipment, and creating an ergonomic workspace. Proper body alignment involves maintaining a neutral posture while shooting, avoiding excessive bending or twisting of the spine, and distributing weight evenly. Using a camera grip that fits comfortably in the hand and a padded camera strap can help reduce strain on the wrists and shoulders. Camera bags and backpacks should be designed to distribute weight evenly across the body, preventing excessive strain on specific muscle groups. Tripods with adjustable legs and quick-release mechanisms contribute to a more comfortable shooting experience. In the editing phase, photographers should pay attention to their workstation setup. A well-adjusted chair with good lumbar support and a desk at an appropriate height can help prevent neck, back, and wrist pain. Additionally, proper monitor placement, adequate lighting, and glare reduction techniques are essential to minimize eye strain and fatigue. Taking regular breaks, incorporating stretching exercises, and maintaining overall physical fitness are important aspects of preventing MSDs. Conditioning exercises that target muscles commonly used in photography, such as the core, shoulders, and wrists, can help build strength and flexibility. By implementing these ergonomic principles, photographers can reduce the risk of developing MSDs and promote a healthier and more sustainable working environment. It is crucial for photographers to prioritize their well-being and take proactive measures to prevent occupational injuries.
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Lane, Belden C. "Fear: The Maze in Canyonlands and John of the Cross." In Backpacking with the Saints. Oxford University Press, 2015. http://dx.doi.org/10.1093/oso/9780199927814.003.0019.
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It’s one thing to wake up in the middle of the night to an imagined terror. It’s another thing to be wide awake and feel the hand of fear creeping up your spine. Camping alone one winter night above Ghost Ranch in New Mexico, I heard (or did I dream I heard?) scratching on the wall of the tent and the heavy breathing of an animal outside in the snow. I was so frightened I couldn’t voice the scream stifled in my throat. Or was it in my dream that I wasn’t able to make any sound? On waking I wasn’t sure what had or hadn’t happened—or whether it was all in my mind. An even more uncanny experience came on another moonlit night in the depths of the Maze in Canyonlands National Park in southeast Utah. A friend and I had walked a mile down the canyon from our campsite, under the shadow of the towering walls within that vast winding labyrinth. Hiking in the light of a full moon without flashlights, we felt a sense of wild, animal abandonment. With reckless exuberance we’d been howling like wolves at the moon. But then we found ourselves standing before a canyon wall covered with ancient figures painted by archaic artists some two thousand years ago. These were spirit beings standing vigil—long, ethereal shadows hovering on the surface of the rock. Whether they were guarding, witnessing, or offering protection, I didn’t know. But in the hollowed-out world of moonlight and shadow that formed the Maze, I sensed the presence of something I couldn’t name. It’s a place about as far away from other people as you can get in the lower forty-eight, yet for an instant I had an uncanny awareness of a finger lightly touching me on the back of the neck. I’d been taken into a profoundly deeper meaning of fear. Three days earlier we had driven seven hours from the Hite Marina on Lake Powell along a tortuous dirt road, part of the old Flint Trail. It was a belly-scraping, wheel-spinning, bronco-twisting ride, with hairpin turns around huge boulders and narrow rocky ledges.
Conference papers on the topic "Back somersault with twisting"
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Potop, Vladimir, Valeriu Jurat, Victor Buftea, and Viorel Dorgan. "USE OF E-TRAINING IN MATHEMATICAL MODELING OF THE BIOMECHANICAL CHARACTERISTICS OF DOUBLE BACK SOMERSAULT ON THE FLOOR." In eLSE 2017. Carol I National Defence University Publishing House, 2017. http://dx.doi.org/10.12753/2066-026x-17-202.
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The purpose of this paper is to develop a mathematical model based on the use of e-training in the technical preparation of acrobatic elements on floor in women’s artistic gymnastics. This scientific approach has led to the organization of an experimental study, using the research methods as follows: analysis of specialized scientific literature; computerized video method by means of ”Pinnacle Studio” program of capture and video processing; also ”Kinovea” and ”Physics ToolKit” programs for biomechanical video analysis of sports technique; method of mathematical modeling; method of postural orientation of movement; statistical method, using ”KyPlot” computerized program. A number of 13 athletes aged from 12 to 15 years, all of them members of junior national team of Romania, participated in this research, which was conducted from 2012 to 2014. In this regard, 36 double back somersaults performed in three national competitions were analyzed in terms of biomechanics; the results of the kinematic and dynamic characteristics and the performances achieved in competitions were statistically correlated. It has been highlighted the linear correlative significance of the kinematic and dynamic characteristics for the translation with rotation movement, in accordance with the anthropometric, biomechanical and performance indicators of junior gymnasts of 12 to 15 years old, for developing the mathematical model of double back somersault in women’s artistic gymnastics. The effective use of e-training in the mathematical modeling of the biomechanical characteristics of sports performances created the possibility to deepen the phasic preparation of sports training and the more efficient processing of the modern didactical programs of learning.
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Hirose, Motoki, Sota Shimizu, and Rikuta Mazaki. "Tornado: Power Assist Suit to Assist Twisting Motion of Lower Back." In IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2022. http://dx.doi.org/10.1109/iecon49645.2022.9968664.
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Fang, Zheng, and Kai Lu. "Ultra-Wideband Circularly Polarized Back-Fed Horn Antenna with Twisting Ridges." In 2022 International Conference on Microwave and Millimeter Wave Technology (ICMMT). IEEE, 2022. http://dx.doi.org/10.1109/icmmt55580.2022.10023276.
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Memije, D., O. Carranza, J. J. Rodriguez, R. Ortega, and F. E. Rodarte. "Super- Twisting Algorithm for Back EMF Harmonic Rejection in a Permanent Magnet Synchronous Motor." In 2021 IEEE 30th International Symposium on Industrial Electronics (ISIE). IEEE, 2021. http://dx.doi.org/10.1109/isie45552.2021.9576347.
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Otsuka, Keisuke, Taku Itami, Jun Yoneyama, Kimiwa Itami, Keiko Seki, and Mikiko Senda. "Twisting posture detection using triaxial accelerometers to prevent low back pain in nurses and caregivers." In 2023 IEEE/SICE International Symposium on System Integration (SII). IEEE, 2023. http://dx.doi.org/10.1109/sii55687.2023.10039044.
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Yang, Xiaofei, Xuman An, Yunjie Wu, Fei Ma, and Bohao Li. "Adaptive super-twisting sliding mode back-stepping control for hypersonic flight vehicle with impact angle constraint and autopilot dynamics." In 2022 IEEE 17th International Conference on Control & Automation (ICCA). IEEE, 2022. http://dx.doi.org/10.1109/icca54724.2022.9831896.
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Lall, Pradeep, Hyesoo Jang, and Scott Miller. "Twist Reliability Assessment of Flexible Battery in Wearable Applications." In ASME 2020 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/ipack2020-2647.
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Abstract Survivability of thinner power sources such as flexible Li-ion batteries (LIB) when exposed to repeated charge-discharge cycles at different operating temperatures along with small mechanical twisting loads encountered in human body applications is relatively unknown. With the advancements in portable and densely packaged electronics, thin power sources, which are reliable and are needed to sustain the daily stresses of motion. The ability of thin form factors to operate reliably in presence of loads such twisting while simultaneously being exposed to different ambient temperatures is the major concern. Development of meaningful test protocols for reliability of the battery requires the replication of human body motion. A twisting test-stand capable of replicating the stresses of daily motion in a lab-environment has been developed for the test. The battery state assessment analyzer comprises of programmable source meter and electronic load, a multi-channel data acquisition system, LabVIEW user interface. A mechanical bending actuator controlled via microcontroller was used for subjecting the LIBs to bending loads. The microcontroller was programmed in a way such that 60 twisting cycles were performed during every discharge phase. A total of 150 charge-discharge cycles are conducted during the life cycle tests where each cycle is comprised of discharging to full depth, bending during discharging, and charging back to full voltage. The degradation of the batteries has been studied. FEM model has been developed for life prediction of the battery and for assessment of acceleration factors between test conditions and use conditions.
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Esat, Volkan, and Memis Acar. "Biomechanical Response of a Functional Spine Unit Under Various Loading Conditions: A Viscoelastic Finite Element Approach." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-61728.
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Biomechanical and epidemiologic studies state that recreational activity and industrial work, embodying static work postures, physically heavy tasks, frequent bending, and twisting motions, lifting and sudden loading incidents are highly related to low back pain disorders. In order to provide a comprehensive understanding of the low back pain under severe and traumatic static and dynamic loading conditions, the finite element (FE) technique is widely used as a computational method to model, simulate and analyse the behaviour of the spinal segments in the lumbar spine, which are much more difficult with in vitro and in vivo experimental studies. Intervertebral discs, having many other functions, support a huge extent of the compressive loadings the trunk is subjected to. The results of the FE analyses can be employed to understand the injury mechanisms occurring in and about the intervertebral discs, providing stress and strain distributions, and to aid the therapists in selecting the type of treatment for low back pain, and in developing guidelines for industrial safety.
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Gudavalli, Maruti R., Jerrilyn A. Backman, Steven J. Kirstukas, Anant V. Kadiyala, Avinash G. Patwardhan, and Alexander J. Ghanayem. "Electromyographic Activity of Trunk Muscles During Flexion-Distraction Treatment of Low Back Patients." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0473.
Full textAbstract:
Abstract The objective of this study was to determine the electromyographic (EMG) activity of the superficial muscles during the treatment of low back patients during a conservative procedure known as the Cox flexion-distraction procedure. A total of 33 low back pain patients were recruited for this study from chiropractic and allopathic orthopedic clinics. EMG signals were collected while the patient was in a prone relaxed position, during the treatment using the flexion-distraction procedure, and during maximum voluntary exertions in the three planes (flexion, extension, left and right lateral bending, and left and right twisting). The mean values of the Root Mean Square (RMS) values of EMG ratios during treatment versus resting indicate that the muscles are active during the treatment. This activity is more than the activity at rest. However the mean values of the RMS EMG ratios (during treatment versus maximum voluntary contraction) are small indicating that the muscle activity during treatment may not influence the treatment loads. The left and right muscles in all muscle groups were similarly active. During the treatment, erector spinae muscles were the most active, followed by the external oblique, and the rectus abdominus muscles. The results from this study provide quantitative data for the muscle activity during the flexion-distraction treatment. This information can be incorporated into computer models to estimate the loads generated during the flexion-distraction treatment due to the muscle activity compared to the loads generated by the chiropractic physician.
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dos Santos e Lucato, S. L., R. M. McMeeking, and A. G. Evans. "Kagome-Based High Authority Shape Morphing Structure." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60768.
Full textAbstract:
A concept for a high authority shape morphing plate is described and demonstrated. The design incorporates an active back-plane comprising a Kagome truss, capable of changing the shape of a solid face, connected to the back-plane by means of a tetrahedral truss core. The two shape deformations to be demonstrated consist of hinging and twisting. The design is performed by a combination of analytic estimation and numerical simulation, guided by previous assessments of the Kagome configuration. It is shown that, while the structure is capable of sustaining large passive loads at low weight, the demonstrable authority is actuator-limited. An optimization based on a genetic algorithm has been used to determine the best placement of a limited number of actuators in the structure for a given set of target shapes. The force capability of the actuators and failure threshold loads of the structure were ascertained in the optimization. Possible applications of such multi-shape morphing structures include ailerons and mirrors.
Reports on the topic "Back somersault with twisting"
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Turner, John. Evaluation of Elongation Criteria and Friction Loss in Ground Anchors. Deep Foundations Institute, 2014. http://dx.doi.org/10.37308/cpf-2013-soil-1.
Full textAbstract:
This report describes a research project for evaluating the applicability of the widely accepted 80 percent criterion for elongation of ground anchors to anchors with unbonded lengths exceeding 100 feet. This issue is driven by several recent projects involving ground anchors for landslide stabilization in which a significant percentage of the anchors did not meet the criterion that requires measured elongation during proof load testing of at least 80 percent of the theoretical elastic elongation. The projects involved anchor unbonded lengths in the range of 85 to 220 feet, which is outside the range traditionally used in practice, although anchors of this length are being used more frequently for landslide stabilization. The principal objective of this research is to address whether the widely accepted criterion of 80 percent elongation is applicable for such applications, and whether other factors affect the ability of anchors to meet the criterion. Analytical methods for predicting transfer of load along the length of steel strand due to friction loss are used routinely in the prestressed concrete industry. These analytical expressions provide a rational framework for quantifying changes in load due to friction along the length of a ground anchor in terms of a ‘wobble coefficient’ (K) as defined in Aalami(2004). Values of the wobble coefficient for ground anchors can only be determined by back‐calculating from load tests, i.e., fit the value of K to the appropriate analytical expression based on the known test load and measured percent elongation. The analytical basis is first developed and shown to provide a tool for evaluating results of anchor load tests to determine the magnitude of expected elongation as a function of unbonded length. Next, a database of anchor load tests is used to back‐calculate values of K for anchors with unbonded lengths in the range typically used in geotechnical applications (<100feet). These values of K are then used to calculate expected friction loss for anchors with high unbonded lengths (100 to 250 feet) to evaluate whether the 80 percent criterion is reasonable. The primary findings of this research are: Field data data show a general trend of increasing rate of friction loss with increasing unbonded length, i.e., longer anchors are more likely to fail the 80‐percent minimum elongation criterion; Shallow anchor inclination appears to be a strong contributor to higher friction loss because it makes placement of the anchor into the hole difficult, requiring the anchor to be forced in, which may induce additional curvature and twisting; Factors that contribute to alignment deviations of the anchor drill hole, such as obstructions, discontinuities, or alternating hard and soft layers, also contribute to curvature and increase friction loss; Factors that result in forcing the anchor in to the hole, which for the cases considered involved a combination of long anchors, shallow inclination, and alignment deviations, increases the probability of anchor damage. For example, failure of the seal between the bond and unbonded segments of the anchor may allow grout to penetrate the sheathing, preventing elastic deformation of the strands.