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Barrett, Steve, Matthew C. Varley, Samuel P. Hills, Mark Russell, Matt Reeves, Adam Hearn, and Christopher Towlson. "Understanding the Influence of the Head Coach on Soccer Training Drills—An 8 Season Analysis." Applied Sciences 10, no. 22 (November 17, 2020): 8149. http://dx.doi.org/10.3390/app10228149.
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Soccer players perform a variety of training drills to develop the physical, technical and tactical qualities required for match-play. The role of coaches in prescribing training suggests that players may not always meet physical targets set by conditioning staff. To quantify the physical outputs elicited by different training drill types, 183 professional soccer players were monitored over 8 seasons using Microelectromechanical Systems during normal training, yielding 65,825 drill observations [362 ± 341 observations·player−1]. Linear mixed models assessed the influence of drill type, head coach and playing position on physical output. Drills lasted ~14 min, eliciting total distances and high speed running of ~1000 m and 40 m, respectively. Conditioning drills elicited substantially greater relative high-speed running [18.8 ± 27.2 m.min−1] and Sprint [3.5 ± 9.4 m.min−1] distances than all other drill types. The proportion of training drill types used and external outputs elicited per drill were affected by the head coach. Midfielders recorded the highest total distance [77.3 ± 36.1 m.min] and PlayerLoad™ [8.29 ± 3.54] of any playing position, whilst the lowest outputs were recorded by goalkeepers. This study provides reference data for practitioners when seeking to manipulate training prescription to achieve physical output targets whilst also meeting the team’s technical and tactical objectives.
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Ade, Jack D., Jamie A. Harley, and Paul S. Bradley. "Physiological Response, Time–Motion Characteristics, and Reproducibility of Various Speed-Endurance Drills in Elite Youth Soccer Players: Small-Sided Games Versus Generic Running." International Journal of Sports Physiology and Performance 9, no. 3 (May 2014): 471–79. http://dx.doi.org/10.1123/ijspp.2013-0390.
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Purpose:To quantify the physiological responses, time–motion characteristics, and reproducibility of various speed-endurance-production (SEP) and speed-endurance-maintenance (SEM) drills.Methods:Sixteen elite male youth soccer players completed 4 drills: SEP 1 v 1 small-sided game (SSG), SEP running drill, SEM 2 v 2 SSG, and SEM running drill. Heart-rate response, blood lactate concentration, subjective rating of perceived exertion (RPE), and time–motion characteristics were recorded for each drill.Results:The SEP and SEM running drills elicited greater (P < .05) heart-rate responses, blood lactate concentrations, and RPE than the respective SSGs (ES 1.1–1.4 and 1.0–3.2). Players covered less (P < .01) total distance and high-intensity distance in the SEP and SEM SSGs than in the respective running drills (ES 6.0–22.1 and 3.0–18.4). Greater distances (P < .01) were covered in high to maximum acceleration/deceleration bands during the SEP and SEM SSGs than the respective running drills (ES 2.6–4.6 and 2.3–4.8). The SEP SSG and generic running protocols produced greater (P < .05) blood lactate concentrations than the respective SEM protocols (ES 1.2–1.7). Small to moderate test–retest variability was observed for heart-rate response (CV 0.9–1.9%), RPE (CV 2.9–5.7%), and blood lactate concentration (CV 9.9–14.4%); moderate to large test–retest variability was observed for high-intensity-running parameters (CV > 11.3%) and the majority of accelerations/deceleration distances (CV > 9.8%) for each drill.Conclusions:The data demonstrate the potential to tax the anaerobic energy system to different extents using speed-endurance SSGs and that SSGs elicit greater acceleration/deceleration load than generic running drills.
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Wolski, L., and L. Shelley. "Learn to drill like bolt! running drills for hamstring injury management." Journal of Science and Medicine in Sport 22 (October 2019): S4—S5. http://dx.doi.org/10.1016/j.jsams.2019.08.037.
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Ghufron, Rojil, Adi Sucipto, and Susilo Bekti. "Differences Influence Of Ladder Drill Scissor Hops And Icky Shuffle Training On Improvements Prosperity And Speed In Pencak Silat Athletes." Jp.jok (Jurnal Pendidikan Jasmani, Olahraga dan Kesehatan) 3, no. 2 (May 10, 2020): 227–35. http://dx.doi.org/10.33503/jp.jok.v3i2.798.
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The purpose of this study was to analyze effect of ladder drill scissor hops dan ladder drill icky shuffle on agility and speed in pencak silat athletes. This studi use experimental method with two groups of pretest-posttest design was. Data analysis using quantitative descriptive statistics and t test. The sample consisted of two groups, 10 students were given the ladder drill scissor hops exercise, and 10 students were given the ladder drill icky shuffle. Do exercise for 6 weeks with three exercises per week. Data collected are the 30 meter test to retrieve running speed data and the Illionis Agility Test to retrieve agility data. The results showed the value of the t test agility between groups shows the sig-2 tailed value 0.864>0.05 and the results of the t-speed test show the sig-2 tailed value 0.297>0.05 so that Ho accepted which means both agility and speed have increased but both are not significantly different between the ladder drll scissor hops and the ladder drill icky shuffle.
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Ruslan, Ruslan, and Faturrahman Sangadji. "ZIG-ZAG RUNNING EXERCISES FOR BALL DRILL SKILLS." Jambura Journal of Sports Coaching 3, no. 1 (January 25, 2021): 33–38. http://dx.doi.org/10.37311/jjsc.v3i1.9644.
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Tujuan penelitian ini untuk mengetahui pengaruh latihan lari zig zag terhadap kemampuan menggiring dalam cabang olahraga sepak bola. Penelitian ini menggunakan teknik eksperimen pendekatan quasi eksperiment dengan desain One Group Pretest posttest design. Populasi dalam penelitian ini merupakan seluruh siswa kelas VIII SMP Negeri 1 Tilongkabila, dengan jumlah 183 siswa. Sampel penelitian ini adalah 20 Siswa yang diambil menggunakan Purposive sampling dengan suatu kriteria tertentu. Analisis data mengunakan uji normalitas menggunakan uji lilefors dan uji hipotesis menggunakan uji-t. Hasilnya adalah ada pengaruh latihan lari zig zag sebesar 36,88% terhadap kemampuan menggiring dalam cabang olahraga sepak bola di SMP Negeri 1 Tilongkabila.
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Haetami, Mimi, and Andika Triansyah. "Effect Of Abc Running Drill on the 50 Meter Sprint Of Students." Jurnal Maenpo : Jurnal Pendidikan Jasmani Kesehatan dan Rekreasi 11, no. 1 (June 20, 2021): 78. http://dx.doi.org/10.35194/jm.v11i1.1255.
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The purpose of this study was to determine whether there is an effect of the abc running drill on the ability to sprint 50 meters. The research was conducted using an experimental method with one group pretest-posttest design. At the initial stage, data collection was carried out to determine the initial conditions of students' sprint abilities which included the ability of basic running techniques and 50 meters sprint speed. Data collection techniques using observation and tests. Observations were made by observing basic squat start techniques, running techniques and finishing techniques while the test was used to take a sprint time of 50 meters. The instrument used in the study used a rubric for the assessment of the 50 meter sprint ability. To calculate the data obtained, the Wilcoxon nonparametric test data analysis was used. Based on the results of data analysis, the Asym.Sig. (2-tailed) <0.05, then Ha is accepted. Asym.Sig. (2-tailed) (0.000 <0.05) means that there is an effect of abc running drill on the ability of students to sprint 50 meters.Keywords: Abc Running Drill, 50 Meter Sprint, Students
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Azis, Abdul, Febi Kurniawan, and Resty Gustiawati. "SURVEI PENGGUNAAN MEDIA PEMBELAJARAN LADDER DRILL DALAM PEMBELAJARAN LARI JARAK PENDEK." COMPETITOR: Jurnal Pendidikan Kepelatihan Olahraga 12, no. 2 (June 14, 2020): 67. http://dx.doi.org/10.26858/cjpko.v12i2.13987.
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The purpose of making this skripsi is to find out, analyze, and identify the use of ladder drill learning media in short distance learning in vocational students in North Cikarang District, Bekasi Regency. This research is quantitative descriptive. The method used is a survey method. Data collection techniques in the form of a questionnaire. Data was collected at schools in North Cikarang sub-district. The subjects used in this study were all physical education teachers in North Cikarang sub-district, totaling 18 teachers. Based on the results of research on vocational schools in North Cikarang District 94% of teachers already knew the ladder drill learning media and already knew its shape, 67% of the teachers already had ladder drill learning media at their school, 94% of teachers already knew how to use ladder drill learning media, 56% teachers use ladder drill media in Physical Education learning, 67% of teachers use ladder drill learning media to train speed and agility, 50% of teachers use ladder drill learning media to train foot coordination, 94% of teachers state that ladder learning media are useful for learning Physical education, 67% of teachers state that the ladder drill learning media can increase the speed of running short distances, 94% of teachers already know that there is scope in physical education. Thus it can be stated that the ladder drill learning media is related to help increase the speed of running short distances, because more than half of the physical education teachers in vocational high schools in North Cikarang have used the ladder drill learning media.
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Castagna, Carlo, Lorenzo Francini, Susana C. A. Póvoas, and Stefano D’Ottavio. "Long-Sprint Abilities in Soccer: Ball Versus Running Drills." International Journal of Sports Physiology and Performance 12, no. 9 (October 2017): 1256–63. http://dx.doi.org/10.1123/ijspp.2016-0565.
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Purpose:To examine the acute effects of generic drills (running drills [RDs]) and specific (small-sided-games [SSGs]) long-sprint-ability (LSA) drills on internal and external load of male soccer players. Methods:Fourteen academy-level soccer players (mean ± SD age 17.6 ± 0.61 y, height 1.81 ± 0.63 m, body mass 69.53 ± 4.65 kg) performed four 30-s LSA bouts for maintenance (work:rest 1:2) and production (1:5) with RDs and SSGs. Players’ external load was tracked with GPS technology (20-Hz), and heart rate (HR), blood lactate concentration (BLc), and rating of perceived exertion (RPE) were used to characterize players’ internal load. Individual peak BLc was assessed with a 30-s all-out test on a nonmotorized treadmill (NMT). Results:Compared with SSGs, the RDs had a greater effect on external load and BLc (large and small, respectively). During SSGs players covered more distance with high-intensity decelerations (moderate to small). Muscular RPE was higher (small to large) in RDs than in SSGs. The production mode exerted a moderate effect on BLc while the maintenance condition elicited higher cardiovascular effects (small to large). Conclusion:The results of this study showed the superiority of generic over specific drills in inducing LSA-related physiological responses. In this regard production RDs showed the higher postexercise BLc. Individual peak blood lactate responses were found after the NMT 30-s all-out test, suggesting this drill as a valid option to RDs. The practical physiological diversity among the generic and specific LSA drills here considered enable fitness trainers to modulate prescription of RD and SSG drills for LSA according to training schedule.
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Cummins, Cloe, Blake McLean, Mark Halaki, and Rhonda Orr. "Positional Differences in External On-Field Load During Specific Drill Classifications Over a Professional Rugby League Preseason." International Journal of Sports Physiology and Performance 12, no. 6 (July 2017): 764–76. http://dx.doi.org/10.1123/ijspp.2015-0789.
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Purpose:To quantify the external training loads of positional groups in preseason training drills.Methods:Thirty-three elite rugby league players were categorized into 1 of 4 positional groups: outside backs (n = 9), adjustables (n = 9), wide-running forwards (n = 9), and hit-up forwards (n = 6). Data for 8 preseason weeks were collected using microtechnology devices. Training drills were classified based on drill focus: speed and agility, conditioning, and generic and positional skills.Results:Total, high-speed, and very-high-speed distance decreased across the preseason in speed and agility (moderate, small, and small, respectively), conditioning (large, large, and small) and generic skills (large, large, and large). The duration of speed and generic skills also decreased (77% and 48%, respectively). This was matched by a concomitant increase in total distance (small), high-speed running (small), very-high-speed running (moderate), and 2-dimensional (2D) BodyLoad (small) demands in positional skills. In positional skills, hit-up forwards (1240 ± 386 m) completed less very-high-speed running than outside backs (2570 ± 1331 m) and adjustables (2121 ± 1163 m). Hit-up forwards (674 ± 253 AU) experienced greater 2D BodyLoad demands than outside backs (432 ± 230 AU, P = .034). In positional drills, hit-up forwards experienced greater relative 2D BodyLoad demands than outside backs (P = .015). Conversely, outside backs experienced greater relative high- (P = .007) and very-high-speed-running (P < .001) demands than hit-up forwards.Conclusion:Significant differences were observed in training loads between positional groups during positional skills but not in speed and agility, conditioning, and generic skills. This work also highlights the importance of different external-load parameters to adequately quantify workload across different positional groups.
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McLean, Blake D., Cloe Cummins, Greta Conlan, Grant Duthie, and Aaron J. Coutts. "The Fit Matters: Influence of Accelerometer Fitting and Training Drill Demands on Load Measures in Rugby League Players." International Journal of Sports Physiology and Performance 13, no. 8 (September 1, 2018): 1083–89. http://dx.doi.org/10.1123/ijspp.2017-0729.
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Purpose: To determine the relationship between drill type and accelerometer-derived loads during various team-sport activities and examine the influence of unit fitting on these loads. Methods: Sixteen rugby league players were fitted with microtechnology devices in either manufacturer vests or playing jerseys before completing standardized running, agility, and tackling drills. Two-dimensional (2D) and 3-dimensional (3D) accelerometer loads (BodyLoad™) per kilometer were compared across drills and fittings (ie, vest and jersey). Results: When fitted in a vest, 2D BodyLoad was higher during tackling (21.5 [14.8] AU/km) than during running (9.5 [2.5] AU/km) and agility (10.3 [2.7] AU/km). Jersey fitting resulted in more than 2-fold higher BodyLoad during running (2D = 9.5 [2.7] vs 29.3 [14.8] AU/km, 3D = 48.5 [14.8] vs 111.5 [45.4] AU/km) and agility (2D = 10.3 [2.7] vs 21.0 [8.1] AU/km, 3D = 40.4 [13.6] vs 77.7 [26.8] AU/km) compared with a vest fitting. Jersey fitting also produced higher BodyLoad during tackling drills (2D = 21.5 [14.8] vs 27.8 [18.6] AU/km, 3D = 42.0 [21.4] vs 63.2 [33.1] AU/km). Conclusions: This study provides evidence supporting the construct validity of 2D BodyLoad for assessing collision/tackling load in rugby league training drills. Conversely, the large values obtained from 3D BodyLoad (which includes the vertical load vector) appear to mask small increases in load during tackling drills, rendering 3D BodyLoad insensitive to changes in contact load. Unit fitting has a large influence on accumulated accelerometer loads during all drills, which is likely related to greater incidental unit movement when units are fitted in jerseys. Therefore, it is recommended that athletes wear microtechnology units in manufacturer-provided vests to provide valid and reliable information.
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Kuhl, Tanner W., Jay A. Johnson, Alexander J. Shturmakov, Joshua J. Goetz, Chris J. Gibson, and Donald A. Lebar. "A new large-diameter ice-core drill: the Blue Ice Drill." Annals of Glaciology 55, no. 68 (2014): 1–6. http://dx.doi.org/10.3189/2014aog68a009.
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AbstractThe Blue Ice Drill (BID) is a large-diameter agile drill system designed by the Ice Drilling Design and Operations group of the University of Wisconsin–Madison to quickly core-clean 241 mm diameter ice samples from near-surface sites. It consists of a down-hole motor/gear reducer rotating a coring cutter and core barrel inside an outer barrel for efficient cuttings transport in solid ice. A variable-frequency drive and custom control box regulates electrical power to the drill. Torque reaction is accomplished on the surface via handles attached to a torsion stem. Core recovery is achieved with either core dogs in the sonde or with a separate core recovery tool. All down-hole tools are suspended on a collapsible tripod via ropes running on a capstan winch. The BID is operated by a minimum of two people and has been used successfully during two seasons of coring on a blue ice area of Taylor Glacier, Antarctica. An updated version of the drill system, BID-Deep, has been designed to recover cores to depths up to 200 m.
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Dwi, Dicky Reva Apriana Sanga, Budi, and Boby Agustan. "VO2MAX ANALYSIS ABC RUNNING DRILL WITH TRAINING MASK METHOD USING ANDROID BASED." Gladi : Jurnal Ilmu Keolahragaan 12, no. 05 (December 31, 2021): 396–402. http://dx.doi.org/10.21009/gjik.125.06.
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The purpose of this study was to analyze the effect of ABC Running Drill using Training Mask on increasing Vo2max Android-based. From the research objective, the researcher used the Pretest-Posttest Experiment Design. The research method used is the research and development (RnD) model from Borg and Gall. Population this research is beginner athletes, members of the Unit Kegiatan Mahasiwa (UKM) Track and Field STKIP Muhammadiyah Kuningan totaling 10 people, the sampling technique uses total sampling technique. The research test instrument used to collect data is the 2400 Meter run test (Cooper Test). After getting the data and obtaining it then the data is input into the system to be used as a database on the application, the android application can be downloaded link bit.ly/PDPDickyReva. To analyze the research data using SPSS Version 26, the results of the processing of the Hypothesis Test using the Pearson formula obtained the following data: There is a significant effect after the ABC Running Drill training process using the Training Mask (sig.) 0.00 < 0.05 so it can be concluded that the ABC Running exercise Drill using a Training Mask has a significant effect on increasing vo2max in Track and Field UKM STKIP Muhammadiyah Kuningan.
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Worobets, Jay, Fausto Panizzolo, Steve Hung, John William Wannop, and Darren Stefanyshyn. "The influence of running shoe traction on performance in a short duration maximal effort running drill." Footwear Science 3, sup1 (June 2011): S167—S168. http://dx.doi.org/10.1080/19424280.2011.575833.
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Whitby, David, Budi Utama, and Richard Reading. "Total Depth Solutions' technologies provide effective, efficient and safe well construction method to mitigate borehole problems." APPEA Journal 51, no. 1 (2011): 459. http://dx.doi.org/10.1071/aj10029.
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Permit TL/2 in the Carnarvon Basin, WA, presents several challenges for top hole drilling and casing running operations. Previous experience showed that drilling the 16” hole section and running 13⅜” casing was typically a time consuming phase of the well due to fluid losses and tight hole conditions, consequently requiring the use of seawater to drill, back reaming, wiper trips and occasional spotting of pills. The initial solution delivered to the operator as an alternative method to get 13⅜” casing to total depth (TD) was to employ a casing drill bit to ream the casing to bottom while also delivering an improved drill-out time. This would be coupled with a sophisticated, unique, reliable and simply operated top drive casing running system that was already installed on the rig. Reviewing the Weatherford Total Depth Solutions teamâs systems with cost, time and capabilities analysis, the operator was certain that the application of a complete drilling with casing system (DwC™) would mitigate the known hole problems and yield a safe and more cost-effective surface hole operation, significantly reducing non-productive time (NPT). This paper reviews: the problems that were traditionally encountered during conventional surface hole drilling and casing running operations; the decision-making process that the operator followed prior to employing DwC technology; and, the hazard mitigation and economic benefits realised through a one-way trip to total depth of about 1,000 m TVDRT, which broke to date the longest Weatherford 13⅜” DwC interval globally by the service company and operator.
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Zhang, Ji Ping, Xin Ping Han, Shi Jin Ma, and Zhao Feng Yang. "The Development of the LWD-200B Full Hydraulic Open Cut Mine Drill." Applied Mechanics and Materials 318 (May 2013): 267–71. http://dx.doi.org/10.4028/www.scientific.net/amm.318.267.
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In order to improve the technical level, perforation efficiency and ability of LWD-200B full hydraulic open cut mine drill to adapt to the complex geological conditions, we developed LWD-200B multi-function full hydraulic open cut mine drill, the drill has rotary cutting, impact and roller bit drill three functions.The drill travel use hydraulic motor to drive crawler belt running gear, low speed high torque hydraulic motor to direct top drive drilling rod. Pressure and lifting system use a long stroke hydraulic cylinder, wire rope and pulley mechanism, load sensing constant power variable pump , load sensing electromagnetic proportional multi-way directional valve. The control system uses electronic control handle and PLC controller, design pressure, speed, length, temperature sensors etc. and GPS base station, with real-time data acquisition, display, lithology automatic identification, closed-loop feedback control, GPS precise positioning , the manual and automatic drilling, specified depth or level drilling function. It applies to drilling diameter 150mm ~ 200mm blast hole in various types of open pit mine.
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Gerbrandt, Brad, Marion Joyce Alexander, and David Telles-Langdon. "A Comparison of the Technique of the 180° Cutting Maneuver Performed on Grass and on a Hardwood Floor." International Journal of Physical Education, Fitness and Sports 7, no. 4 (December 17, 2018): 22–35. http://dx.doi.org/10.26524/ijpefs1843.
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The 180º cutting maneuver (also known as the 505 drill) is commonly seen in field and court sports, and it consists of a 15 m run up to a turning point, followed by a timed stop and 180º change of direction for 5 m. The purpose of this study was to determine the most effective joint movements, limb velocities and body positions to perform the 180º cutting maneuver. Additionally, the study compared the kinematics of the 505 drill performed indoors while wearing running shoes and outdoors while wearing cleats. For this study, twelve athletes executed the 505 drill indoors while wearing running shoes, and twelve executed the 505 drill outdoors while wearing cleats. Fifty nine independent variables were measured for each athlete and compared to the athlete’s time to complete the test. Mean test time was 2.27 seconds for the indoor group and a significantly lower 2.47 s for the outdoor group. Correlation analysis and forward stepwise multiple regression analysis was performed on both groups to determine which variables were significantly related to test time. Trunk forward lean at push off of the jab leg was most highly correlated to test time for the indoor athletes (r= -0.887), however, flexion at maximum flexion of the jab knee was most highly correlated to test time for the outdoor group (r= -0.748). Outdoor athletes could benefit from assuming a lower and more flexed body position similar to the indoor athletes and attain a greater degree of trunk lean at jab leg touchdown.
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Popa, Ioan, and Lavinia Silvia Stanciu. "Stress and Displacements Analysis for Drilling Mast Elements Made of Rectangular Pipe: The Overload Test Case." Key Engineering Materials 601 (March 2014): 120–23. http://dx.doi.org/10.4028/www.scientific.net/kem.601.120.
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In the oil and gas industry, the drilling masts are complex metallic constructions made of welded ends beams, which can be classified, from a mechanical point of view, in the statically indeterminate structures` category. The drilling mast is a part of the hoisting system of a drilling rig and its main purposes are: to support some devices as the crown block at the top, the crane, the rotary swivel etc and to provide support for the drill pipes to be stacked vertically during the round trips operations, which implies the operation of removing the drill string from the wellbore or running it back in the hole.
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Ertas, A., W. R. Blackstone, and B. K. Majumdar. "The Effect of Tool Joint Stiffness on Drill Pipe Fatigue in Riser Ball Joints." Journal of Engineering for Industry 111, no. 4 (November 1, 1989): 369–74. http://dx.doi.org/10.1115/1.3188774.
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It is well known that the ball joint in a marine riser can cause fatigue damage in the drill pipe passing through. Previous investigators have assessed the damage done for a lower ball joint angle of 3–5 degrees (drilling) and 1–3 degrees (running casing). This paper extends that work to deep water operations in which an upper ball joint is also present. Also, it is shown, via finite element models, that tool joint bending stiffness can have a significant effect on fatigue life. Fatigue damage calculations, including this heretofore unconsidered effect, are presented for various ball joint angles and drill pipe tensions.
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Wohlfeil, Margo, Cole Neary, Mitchell Klocke, Johnny Mills, Rich Calvert, and David Senchina. "Should high-top or low-top cleats be used when playing baseball." American Journal of Undergraduate Research 16, no. 1 (June 23, 2019): 5–13. http://dx.doi.org/10.33697/ajur.2019.011.
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There is a shortage of knowledge about how baseball cleat design may impact athletes. The purpose of this experiment was to determine if the height of the baseball cleat affected performance, perception of the cleat, and ankle range-of-motion. Thirteen subjects participated in the study, and each subject performed three drills (base-running, 5:10:5 "pro agility," and hitting) in both high-top and low-top baseball cleats. Performance time was measured for the first two drills. Perception of comfort, heaviness, shoe climate (heat), stability, and traction were measured for all three drills using 10-cm visual analog scales (VAS). Ankle range-of-motion (dorsiflexion, plantarflexion, eversion, and inversion) was measured using goniometry in both cleats, plus socks-only as baseline control. Shoe height did not significantly affect completion time in either the base-running drill (6.1±0.1 sec. in high-top vs. 6.1±0.1 sec. in low-top) or pro-agility drill (4.8±0.1 sec. in high-top vs. 4.6±0.1 sec. in low-top). There were significant differences in perception of heat (6.4 in high-top vs. 4.6 in low-top; p<.001), stability (6.9 in high-top vs. 5.1 in low-top; p=.001), and heaviness (6.0 in high-top vs. 4.1 in low-top; p<.001), but not in perception of comfort (6.1±2.0 in high-top vs. 6.6±1.5 in low top) or traction (7.3±2.0 in high-top vs. 7.4±1.5 in low-top). There were significant differences between high-top and low-top cleats in plantarflexion (42.5° in high-top vs. 47.5° in low-top; p=.033), eversion (7.9° in high-top vs. 11.3° in low-top; p=.003), and inversion (12.8° in high-top vs. 16.6° in low-top; p=.044), but not dorsiflexion (8.2° in high-top vs. 10.9°). For baseball players concerned about excessive ankle movements during play, these results suggest that using a high-top baseball cleat might reduce ankle range-of-motion without impairing performance or feeling burdensome. KEYWORDS: Baseball; Cleats; High-Top; Low-Top; Perception; Performance; Range-of-Motion; Shoes
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di Prampero, Pietro, and Cristian Osgnach. "Metabolic Power in Team Sports - Part 1: An Update." International Journal of Sports Medicine 39, no. 08 (June 14, 2018): 581–87. http://dx.doi.org/10.1055/a-0592-7660.
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AbstractTeam sports are characterised by frequent episodes of accelerated/decelerated running. The corresponding energy cost can be estimated on the basis of the biomechanical equivalence between accelerated/decelerated running on flat terrain and constant speed running uphill/downhill. This approach allows one to: (i) estimate the time course of the instantaneous metabolic power requirement of any given player and (ii) infer therefrom the overall energy expenditure of any given time window of a soccer drill or match. In the original approach, walking and running were aggregated and energetically considered as running, even if in team sports several walking periods are interspersed among running bouts. However, since the transition speed between walking and running is known for any given incline of the terrain, we describe here an approach to identify walking episodes, thus utilising the corresponding energy cost which is smaller than in running. In addition, the new algorithm also takes into account the energy expenditure against the air resistance, for both walking and running. The new approach yields overall energy expenditure values, for a whole match,≈14% smaller than the original algorithm; moreover, it shows that the energy expenditure against the air resistance is≈2% of the total.
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Hristova, G., M. Dallev, and G. Tihanov. "Design parameters of furrow forming and compacting roller of the combined seeder STS-80." Agricultural Science and Technology 13, no. 3 (September 2021): 292–94. http://dx.doi.org/10.15547/ast.2021.03.048.
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Abstract. A turf seed drill (STS-80) has been designed, in which the seeds from the sowing machines are sent to the soil through seed pipes. The size of the seeds is relatively small, therefore it is a requirement for them to be sown at a depth between 0.5 cm and 1.5 cm. The drill allows the following operations to be performed simultaneously: soil furrowing, seed sowing, and soil compaction with a compaction roller. The structure of the individual bodies that make up the aggregate is essential for the smooth running of the work process. Two rollers have been developed, which allow the providing of the necessary agro-technical requirements for sowing grass seeds. The role of the roller mounted in the front part of the drill is to make furrows in the soil at a depth of 1.5 cm, where the grass seeds fall. The roller, located in the rear of the unit, dulls the surface of the soil after the seeds enter it. This creates additional dynamic force, which increases the degree of soil compaction and the intensity of destruction of soil aggregates at a certain mass of the roller.
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Kryzhanivskyi, Yevstakhii, Oleg Vytyaz, Roman Hrabovskyi, and Volodymyr Tyrlych. "Statistical analysis of drill pipe failures of strength groups S-135 and G-105." Nafta-Gaz 78, no. 7 (July 2022): 513–23. http://dx.doi.org/10.18668/ng.2022.07.03.
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The characteristic types of operational defects that can form on the inner or outer surface of drill pipes of strength groups S-135 and G-105 (according to API Spec 5DP) are described using the results of technical diagnostics from drilling wells in the Dnipro-Donetsk gas and oil region. In 2018 and 2019, the Ukrburgaz Drilling Department rejected 81 drill pipes of strength group S-135 and 89 drill pipes of strength group G-105 when drilling wells to a depth of 4000 to 6000 m. A statistical evaluation of the operational defects detected during deep drilling of wells (4000–6000 m) was carried out. Potentially dangerous areas were identified: in the drilling pipe upset zone and along the length of the drill string end drill pipes lifetime has been taken into account. It is recommended during defectoscopy of drill string pipes of the selected strength groups to pay close attention to the sections of pipes of strength group S-135 from the end of the coupling or nipple, in the range of 0.45 m to 0.57 m, and for sections of pipes of strength group G-105, in the range of 0.55 m to 0.63 m. In addition, given the depth of drilling (Lmax), when performing diagnostics on drill pipes, special attention should be paid to sections with the most likely defect (Lf ) along the length of the drill string. In particular, taking into account the relative length (Lf /Lmax) of the drill string, for pipes of strength groups S-135 and G-105, segments in the ranges of 0.34 to 0.47 and 0.43 to 0.52, respectively, were identified as having the highest probability of operational defects. The peculiarities of the influence of a drill pipe operating lifespan depending on the strength group were established. In particular, during the long-term deepening of drill pipes in strength group S-135, three stages of drilling were distinguished: Stage I – running-in (from start-up to 2000 hours); Stage II – stable work (2000 to 7000 hours); and Stage III – accelerated destruction (7000 hours and longer). It was found that during defectoscopy of the pipe, special attention should be paid to the drill pipe, the service life of which is 602–998 hours in the first stage, from 3348 to 5344 hours in the second stage, and from 8942 to 10 584 hours in the third stage, because these periods carry the greatest probability of originating an inadmissible defect. For long-term drilling works with pipes of strength group G-105, two stages of drilling were distinguished: the first stage, of stable work (up to 6000 hours), and the second stage, of accelerated destruction (6000 hours and longer). It was found that during defectoscopy of the pipe, special attention should be paid to the drill pipe, the service life of which is from 2692 to 3736 hours in the first stage and from 8744 to 10 983 hours in the second stage, because these periods demonstrate the greatest probability of an inadmissible defect.
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Chen, Wenkang, Chuanjun Han, and Liangliang Ding. "Analysis of running depth and study of combined tubing of drill-grinding string in horizontal wells." Journal of Mechanical Science and Technology 35, no. 12 (December 2021): 5359–70. http://dx.doi.org/10.1007/s12206-021-1108-9.
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Zakir, Rasul Valiyev. "Surge and Swab Pressure in Oil Drilling." International Journal for Research in Applied Science and Engineering Technology 10, no. 3 (March 31, 2022): 2425–29. http://dx.doi.org/10.22214/ijraset.2022.41091.
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Abstract: Surge and swab pressures have been for a while an issue in the drilling of an oil well. The drill string causes a flow for displaced fluid and a pressure change in the borehole when running in or pulling out of the hole. When the string moves upward creates a swab pressure and it creates a surge pressures when moves downward. Surge and swab pressures have for a long time been a problem in the petroleum industry. These pressure changes are mainly related to tripping operations, where the drill string has to be pulled out of the well, normally due to a worn out drill bit, or a broken tool. The desire is to optimize the process and time used to trip in and out of the well, to save time and money, and at the same time not taking any risks. If the tripping speed exceeds a certain limit, the pressure changes in the well may become so severe that the consequences are fatal. The main aim of the thesis is to show the models with the affecting parameters of surge and swab pressures, to explore their effect on the fluid behavior models. The Bingham plastic model, the Power Law model, and the Herschel-Bulkley model are utilized to get the best outcomes. Keywords: surge, swab, pressure, tripping, bottom whole assembly, drilling, oil and gas, well, drilling fluid
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Maggioni, Martina A., Matteo Bonato, Alexander Stahn, Antonio La Torre, Luca Agnello, Gianluca Vernillo, Carlo Castagna, and Giampiero Merati. "Effects of Ball Drills and Repeated-Sprint-Ability Training in Basketball Players." International Journal of Sports Physiology and Performance 14, no. 6 (July 1, 2019): 757–64. http://dx.doi.org/10.1123/ijspp.2018-0433.
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Purpose: To investigate the effects of ball drills and repeated-sprint-ability training during the regular season in basketball players. Methods: A total of 30 players were randomized into 3 groups: ball-drills training (BDT, n = 12, 4 × 4 min, 3 vs 3 with 3-min passive recovery), repeated-sprint-ability training (RSAT, n = 9, 3 × 6 × 20-m shuttle running with 20-s and 4-min recovery), and general basketball training (n = 9, basketball technical/tactical exercises), as control group. Players were tested before and after 8 wk of training using the following tests: , squat jump, countermovement jump, Yo-Yo Intermittent Recovery Test Level 1 (YIRT1), agility T test, line-drill test, 5-/10-/20-m sprints, and blood lactate concentration. A custom-developed survey was used to analyze players’ technical skills. Results: After training, significant improvements were seen in YIRT1 (BDT P = .014, effect size [ES] ± 90% CI = 0.8 ± 0.3; RSAT P = .022, ES ± 90% CI = 0.7 ± 0.3), the agility T test (BDT P = .018, ES ± 90% CI = 0.7 ± 0.5; RSAT P = .037, ES ± 90% CI = 0.7 ± 0.5), and the line-drill test (BDT P = .010, ES ± 90% CI = 0.3 ± 0.1; RSAT P < .0001, ES ± 90% CI = 0.4 ± 0.1). In the RSAT group, only 10-m sprint speeds (P = .039, ES ± 90% CI = 0.3 ± 0.2) and blood lactate concentration (P = .004, ES ± 90% CI = 0.8 ± 1.1) were improved. Finally, technical skills were increased in BDT regarding dribbling (P = .038, ES ± 90% CI = 0.8 ± 0.6), shooting (P = .036, ES ± 90% CI = 0.8 ± 0.8), passing (P = .034, ES ± 90% CI = 0.9 ± 0.3), rebounding (P = .023, ES ± 90% CI = 1.1 ± 0.3), defense (P = .042, ES ± 90% CI = 0.5 ± 0.5), and offense (P = .044, ES ± 90% CI = 0.4 ± 0.4) skills. Conclusions: BDT and RSAT are both effective in improving the physical performance of basketball players. BDT had also a positive impact on technical skills. Basketball strength and conditioning professionals should include BDT as a routine tool to improve technical skills and physical performance simultaneously throughout the regular training season.
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Rohman, Ujang. "METODE PEMBELAJARAN PERMAINAN BOLA TANGAN DENGAN MENGGUNAKAN LATIHAN LADDER DRILL HOP SCOTCH PENGARUHNYA TERHADAP KEMAMPUAN AGILITY BERMAIN BOLA TANGAN." Buana Pendidikan: Jurnal Fakultas Keguruan dan Ilmu Pendidikan 14, no. 26 (October 26, 2018): 136–43. http://dx.doi.org/10.36456/bp.vol14.no26.a1678.
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This research is motivated by the fact that teaching in activities Students of the 2015 Sports Coaching Education, the Teaching and Education Faculty of the University of PGRI Adi Buana Surabaya the delivery of training materials less than the maximum, so that learners become passive and processes running less interesting extracurricular activities. Agility on hand ball sport is a absolut needs wich is must be had by all of hand ball’s atletes. Formulation of the problem in this research is "Hand ball learning method using training ladder drill hop scotch effect on ability materials to play hand ball" The goal is to determine the presence or absence of ladder drill hopscotch training for agility on hand ball game on boy students 18th grade of student of 2015 Sports Coaching. Agility is ability of someone to move faster and turn the navigate with agile. Agility is a combine of speed, strength, balance, flexibility and coordination. In this study to measure the agility use the instrumen of research zig-zag run test.. Subjects in this study consisted of 15 boy students. The method used for this study is one group pretest-posttest design. Data collection techniques using the test. Results of the t test obtained by value t = 6,795 and while t table with significance level of α = 5% (0.05) 1.761. Thus t count > t table is 6,795 > 1.761. This means that by using ladder drill hopscotch training influence the agility of hand ball game.
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Gaudino, P., F. Iaia, G. Alberti, R. Hawkins, A. Strudwick, and W. Gregson. "Systematic Bias between Running Speed and Metabolic Power Data in Elite Soccer Players: Influence of Drill Type." International Journal of Sports Medicine 35, no. 06 (October 28, 2013): 489–93. http://dx.doi.org/10.1055/s-0033-1355418.
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Du, Zhen Yu, and Yi Xing Zhang. "Influence of Convalescence on Soil Temperature Field around a Vertically Buried Single-U-Tube Ground Heat Exchanger." Applied Mechanics and Materials 121-126 (October 2011): 1651–55. http://dx.doi.org/10.4028/www.scientific.net/amm.121-126.1651.
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The mathematical physical model of the heat and moisture transfer in the single-U-tube heat exchanger of a ground source heat pump (GSHP) is validated using observed data from the practical rock-soil thermal response test on a resident district in Taiyuan, the soil is layered according to the geological structure of an actual drill in the depth direction in this model. Inputting the dynamic design cooling and heating load of the district into the Realizable turbulent model in Fluent, the temperature fields of a single well in the GSHP project running for 1 year in 2 conditions in which convalescence is considered and not, are simulated numerically. It shows that it rather necessary to take the influence of convalescence into consideration while predicting the soil temperature field of a GSHP system running for a long term, or may not correspond to the reality and make a wrong theory guide to the practical engineering.
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Carpenter, Chris. "High-Density Brine Used in Oil-Based Completion Fluid Deployed Offshore Norway." Journal of Petroleum Technology 73, no. 03 (March 1, 2021): 67–68. http://dx.doi.org/10.2118/0321-0067-jpt.
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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 199243, “First Use of a Newly Developed High-Density Brine in an Oil-Based Screen Running Fluid in a Multilateral Extended-Reach Well: Fluid Qualification, Formation Damage Testing, and Field Application, Offshore Norway,” by Bjarne Salmelid, Morten Strand, and Duncan Clinch, Halliburton, et al., prepared for the 2020 SPE International Conference and Exhibition on Formation Damage Control, Lafayette, Louisiana, 19–21 February. The paper has not been peer reviewed. When used for running sand-control screens, low-solids, oil-based completion fluids (LSOBCF) maintain reservoir wellbore stability and integrity while minimizing the potential risks of losses, screen plugging, completion damage, and productivity impairment. Until now, using LSOBCF as a screen running fluid has been limited by fluid density. The complete paper discusses the design, qualification, and first deployment of an LSOBCF that incorporates a newly developed, high-density brine as the internal phase to extend the density limit. Field History This new field’s well forms part of the greater Alvheim area located in the central part of the North Sea, close to the UK sector. The formations discussed present excellent reservoir characteristics but also significant drilling challenges. The intruded country rock tends to have a high shear failure gradient (SFG) combined with a relatively low fracture gradient. Furthermore, because these reservoirs are exploited using long horizontal and multilateral wells, the drilling window is relatively narrow. For the presented case, the SFG was anticipated to be 1.39 specific gravity (SG) equivalent mud weight with an equivalent circulating density limit of 1.49 SG and stretch limit of 1.53 SG. The fluid density chosen to drill the well was 1.40 SG, and the density for the screen running fluid was planned to be 1.45 SG. Fluids Qualification Laboratory Testing Matrix. An extensive laboratory test matrix was initiated for the qualification of reservoir fluids. The reservoir fluid and drill-in fluid (RDIF) qualification is not detailed in the paper, only the LSOBCF and the novel brine used to prepare this fluid. The test matrix included tests such as rheology performance, long-term stability, production screen on 275 µm screen coupons, standard fluid-loss and filter-cake repair capabilities, reservoir fluid and RDIF compatibility tests, true crystallization temperature (TCT), and corrosion rate. The ultimate test was to check for formation and completion damage performance.
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Nuryadi, Achmad, and Guntur Firmansyah. "PENGARUH LATIHAN LADDER DRILL TERHADAP KECEPATAN LARI 60 METER PADA SISWA SEKOLAH BOLA BASKET LOC SIDOARJO." JP.JOK (Jurnal Pendidikan Jasmani, Olahraga dan Kesehatan) 2, no. 1 (November 14, 2018): 63–69. http://dx.doi.org/10.33503/jpjok.v2i1.191.
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Abstract
The research approach used is a type of experimental research using a pre-experimental design that is one group pretests-posttest design. From the data analysis above, the results obtained for the correlation of 0.877 from mean X1 = 9.9700 with a standard deviation of 0.62619 and mean X2 = 9.8108 with a standard deviation of 0.6380, while for the results of the pre-test and post-test results obtained mean 0.159220 with a standard deviation of 0.32138 and the result of the t test is 2.477, thus Ho is accepted so that the ladder drill exercise provided can increase the running speed of 60 meters in Sidoarjo LOC Basketball School.
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Wannop, John, Shaylyn Kowalchuk, Michael Esposito, and Darren Stefanyshyn. "Influence of Artificial Turf Surface Stiffness on Athlete Performance." Life 10, no. 12 (December 10, 2020): 340. http://dx.doi.org/10.3390/life10120340.
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Properties of conventional playing surfaces have been investigated for many years and the stiffness of the surface has potential to influence athletic performance. However, despite the proliferation of different infilled artificial turfs with varying properties, the effect of surface stiffness of these types of surfaces on athlete performance remains unknown. Therefore, the purpose of this project was to determine the influence of surface stiffness of artificial turf systems on athlete performance. Seventeen male athletes performed four movements (running, 5-10-5 agility, vertical jumping and sprinting) on five surfaces of varying stiffness: Softest (−50%), Softer (−34%), Soft (−16%), Control, Stiff (+17%). Performance metrics (running economy, jump height, sprint/agility time) and kinematic data were recorded during each movement and participants performed a subjective evaluation of the surface. When compared to the Control surface, performance was significantly improved during running (Softer, Soft), the agility drill (Softest) and vertical jumping (Soft). Subjectively, participants could not discern between any of the softer surfaces in terms of surface cushioning, however, the stiffer surface was rated as harder and less comfortable. Overall, changes in surface stiffness altered athletic performance and, to a lesser extent, subjective assessments of performance, with changes in performance being surface and movement specific.
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Chatterjee, Kallol, and Mrinal Das. "INFLUENCE OF 50 METER DRILL OF DIFFERENT INTENSITY TRAINING ON ANAEROBIC CAPACITY OF MALEKHO-KHO PLAYERS." International Journal of Advanced Research 10, no. 04 (April 30, 2022): 597–605. http://dx.doi.org/10.21474/ijar01/14589.
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Purpose: Aim of the study was to investigate the influence of 50 meter drill of different intensity training on anaerobic capacity of male Kho-Kho players. Method: Pre test - Post test Purposive Design was used by which total thirty two (N=32) male Kho-Kho players (Age: 17.66 + 1.34 years, BMI: 20.04 + 1.36 kg/m2, Resting Heart Rate: 74.44 + 1.44 beats/min., Training Age: 3.78 + 0.75 years) were purposively selected and assigned into four equal groups: HIITG (n=8), MIITG (n=8), CHMIITG (n=8) and ACG (n=8). Anaerobic Capacity (Unit: Watts) was assessed by Running Based Anaerobic Sprint Test (RAST) before and after the completion of eight weeks 50 meters drill of different intensity interval training. Data analysis methods were descriptive statistics: Mean, Standard Deviation and Standard Error, inferential statistics: 2-tailed One-Way ANCOVA with Bonferroni Post-Hoc test and normality test: Shapiro-Wilk test respectively performed on IBM SPSS software (Version: 25). The alpha (α) level was set at p≤0.05 for significance, whereas the effect size was reported with the 95% confidence for all analyzed measures. Result:The results shown that there was significant (p<0.05) increases in anaerobic capacity (Power in Watts) for each experimental groups (EG) in comparison to active control group (ACG). Conclusion:The present results indicate that eight (8) weeks 50 meter drill of different intensity interval training showed an increase in anaerobic capacity of senior state level male Kho-Kho players. Not only HIIT is better and beneficial than MIIT, but also CHMIIT too is better and beneficial than MIIT.
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Li, Xiang Feng, Gen Lian Yang, and Dun Wen Zuo. "Recognition for Spindle Speeds of Drill Press Based on Sound Signals Produced from Drilling." Key Engineering Materials 375-376 (March 2008): 535–38. http://dx.doi.org/10.4028/www.scientific.net/kem.375-376.535.
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Effects of running state and spindle speeds on the sound signals produced from a drill press are investigated. And the obtained sound signals by using of a sound level meter are analyzed in both time domain and frequency domain. It is evident that there is more high frequency energy for drilling sound signals with load than without load. And spindle speeds still affect their energy distribution of drilling sound signals. Using wavelet decomposition and wavelet packet decomposition, drilling sound signals are decomposed into a number of frequency bands. And energy percentages of the divided frequency bands are extracted to be the effective characteristics to recognize spindle speeds. Meanwhile, training error of different BP networks is compared to obtain the effective network for recognition spindle speeds. By using of the obtained network structure named 16-30-5, the study rate for training samples and the recognize rate for testing samples are all above 95%.
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McNicoll, Russell. "HORIZONTAL DRILLING IN AUSTRALIA: THREE CASE HISTORIES." APPEA Journal 31, no. 1 (1991): 354. http://dx.doi.org/10.1071/aj90027.
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Three horizontal wells with horizontal sections of up to 331 m were drilled successfully during the development of the marginal North Herald and South Pepper oil and gas fields, which have relatively thin oil columns (6 to 12 m) at a depth of some 1200 m sub-sea. A steerable motor system was used to maintain directional control within the design parameters. This system proved to be successful from the start and no major changes to the bottom hole assembly design were required to drill all the wells. Average drilling time including running and setting the seven inch liner amounted to 12 days. The wells were tested with rates up to 7500 BOPD through a one inch choke.
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Lambers, Kaj T. A., Jari Dahmen, Mikel L. Reilingh, Christiaan J. A. van Bergen, Sjoerd A. S. Stufkens, and Gino M. M. J. Kerkhoffs. "Arthroscopic lift, drill, fill and fix (LDFF) is an effective treatment option for primary talar osteochondral defects." Knee Surgery, Sports Traumatology, Arthroscopy 28, no. 1 (September 13, 2019): 141–47. http://dx.doi.org/10.1007/s00167-019-05687-w.
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Abstract Purpose The purpose of this study was to describe the mid-term clinical and radiological results of a novel arthroscopic fixation technique for primary osteochondral defects (OCD) of the talus, named the lift, drill, fill and fix (LDFF) technique. Methods Twenty-seven ankles (25 patients) underwent an arthroscopic LDFF procedure for primary fixable talar OCDs. The mean follow-up was 27 months (SD 5). Pre- and post-operative clinical assessments were prospectively performed by measuring the Numeric Rating Scale (NRS) of pain in/at rest, walking and when running. Additionally, the Foot and Ankle Outcome Score (FAOS) and the Short Form-36 (SF-36) were used to assess clinical outcome. The patients were radiologically assessed by means of computed tomography (CT) scans pre-operatively and 1 year post-operatively. Results The mean NRS during running significantly improved from 7.8 pre-operatively to 2.9 post-operatively (p = 0.006), the NRS during walking from 5.7 to 2.0 (p < 0.001) and the NRS in rest from 2.3 to 1.2 (p = 0.015). The median FAOS at final follow-up was 86 for pain, 63 for other symptoms, 95 for activities of daily living, 70 for sport and 53 for quality of life. A pre- and post-operative score comparison was available for 16 patients, and improved significantly in most subscores. The SF-36 physical component scale significantly improved from 42.9 to 50.1. Of the CT scans at 1 year after surgery, 81% showed a flush subchondral bone plate and 92% of OCDs showed union. Conclusion Arthroscopic LDFF of a fixable primary talar OCD results in excellent improvement of clinical outcomes. The radiological follow-up confirms that fusion of the fragment is feasible in 92%. This technique could be regarded as the new gold standard for the orthopedic surgeon comfortable with arthroscopic procedures. Level of evidence Prospective case series, therapeutic level IV.
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Xu, Xiaofeng, Yingfeng Meng, Yonghui Liu, and Yueying Ji. "A study on weight-on-bit data correction method of a near-bit measuring tool." Advances in Mechanical Engineering 11, no. 1 (January 2019): 168781401882151. http://dx.doi.org/10.1177/1687814018821518.
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The real weight on bit is difficult to observe or estimate in highly deviated wells and extended-reach wells since complex loads are acted on drill string. Near-bit measurement while drilling tools, which are generally used to address this issue, can only measure axial forces based on axial strains instead of the real WOB. Axial forces on near-bit drill string are mainly controlled by buoyancy force of drilling fluid, circulating pressure, and other factors. To some extent, the measured data can be corrected by force analysis. It should be noted that experiments must be conducted to study the influences of differential pressure and temperature on measured WOB data of near-bit measuring tool. This article presents calculating method of real WOB via correction of measured data, based on force analysis of a self-developed near-bit measuring tool and experiments on influences of differential pressure and downhole temperature. Field test indicates that higher deviation angle will lead to a greater difference between real WOB and the indicated value at wellhead. Multi-well testing data verification indicates that this method is effective and reliable in extracting real WOB, and helpful to accurately identify the running state of bottom-hole assembly.
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Rikken, Quinten, Jari Dahmen, Sjoerd A. Stufkens, and Gino Kerkhoffs. "Long-Term Clinical Results of Arthroscopic Lift-Drill-Fill and Fixation (LDFF) Treatment for Osteochondral Lesions of the Talus." Foot & Ankle Orthopaedics 7, no. 1 (January 2022): 2473011421S0041. http://dx.doi.org/10.1177/2473011421s00416.
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Category: Ankle; Arthroscopy Introduction/Purpose: The purpose of this study was to describe the long-term (> 5 years) clinical results of a novel arthroscopic fixation technique for osteochondral lesions of the talus (OLT), named the Lift, Drill, Fill and Fix (LDFF) technique. Methods: 18 ankles (17 patients) underwent an arthroscopic LDFF procedure for a primary OLT. The mean follow-up was 6.8 years (range: 68 - 96 months). Pre- and postoperative clinical assessment was prospectively performed by measuring the Numeric Rating Scale (NRS) of pain at rest, during walking, and when running. Additionally, the Foot and Ankle Outcome Score (FAOS) including its subscores of pain, symptoms, activities of daily living, sports, and quality. Additionally, the Short Form-36 (SF-36) was assessed. Results: The mean NRS during running significantly improved from 7.8 pre-operatively to 3.7 post-operatively (p = 0.006), the NRS during walking from 5.7 to 1.5 (p < 0.001), and the NRS in rest from 2.3 to 1.0 (p = 0.015). The median FAOS at final follow- up was 80 for pain, 57 for other symptoms, 90 for activities of daily living, 70 for sport, and 55 for quality of life. A pre- and post- operative score comparison was available for fifteen patients, and improved significantly in most subscores. The SF-36 physical component scale significantly improved from 42.9 pre-operatively to 50.1 post-operatively. Conclusion: Arthroscopic LDFF of fixable primary OLTs results in excellent pain reduction and improvement of functional outcomes, with sustained results at long-term follow-up. These results indicate surgeons should consider fixation for a fixable OLT.
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Orantes-Molina, A., J. A. Juárez-Abad, J. Linares-Flores, and Rosebet Miranda Luna. "Automation of a drilling process via a wireless connection using the EMQX protocol." Memorias del Congreso Nacional de Control Automático 5, no. 1 (October 17, 2022): 404–9. http://dx.doi.org/10.58571/cnca.amca.2022.035.
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This paper proposes an alternative solution to automate a system called “Drill Station." Our automation proposal focuses on wireless communication between a GUI and a PLC S7-200 CPU 226 from the manufacturer Siemens to achieve remote control and monitoring of the process. In our proposal, the enriched production Grafcets diagrams and the security Grafcet diagrams are used with the transfer-type process forcing order. The process consists of three work areas: loading, drilling, testing, and evacuation of the part. We showed that with the use of Grafcets, it is possible to fully automate the process, considering the various running, operating, and safety modes, to improve the operation, achieve a better understanding of the drive, and facilitate the training of the operators.
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Little, Max A., and Nick S. Jones. "Generalized methods and solvers for noise removal from piecewise constant signals. I. Background theory." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 467, no. 2135 (June 8, 2011): 3088–114. http://dx.doi.org/10.1098/rspa.2010.0671.
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Removing noise from piecewise constant (PWC) signals is a challenging signal processing problem arising in many practical contexts. For example, in exploration geosciences, noisy drill hole records need to be separated into stratigraphic zones, and in biophysics, jumps between molecular dwell states have to be extracted from noisy fluorescence microscopy signals. Many PWC denoising methods exist, including total variation regularization, mean shift clustering, stepwise jump placement, running medians, convex clustering shrinkage and bilateral filtering; conventional linear signal processing methods are fundamentally unsuited. This paper (part I, the first of two) shows that most of these methods are associated with a special case of a generalized functional, minimized to achieve PWC denoising. The minimizer can be obtained by diverse solver algorithms, including stepwise jump placement, convex programming, finite differences, iterated running medians, least angle regression, regularization path following and coordinate descent. In the second paper, part II, we introduce novel PWC denoising methods, and comparisons between these methods performed on synthetic and real signals, showing that the new understanding of the problem gained in part I leads to new methods that have a useful role to play.
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McNabb, Colm, Tahere Reha, Julia Georgieva, Angela Jacques, Kevin Netto, and Andrew P. Lavender. "The Effect of Sub-Concussive Impacts during a Rugby Tackling Drill on Brain Function." Brain Sciences 10, no. 12 (December 10, 2020): 960. http://dx.doi.org/10.3390/brainsci10120960.
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Concussion is known to detrimentally affect brain health. Rugby tackles commonly occur with high collision force between tackler and ball carrier, and low impact head contact is not uncommon. Cognitive deficits following a bout of soccer ball heading has been attributed to the impact and termed sub-concussion. Although soccer ball heading studies provide evidence for acute effects of sub-concussion, it is unknown whether this phenomenon occurs following rugby tackles. This study investigates the acute effects of rugby tackles on brain function and balance in rugby players. Twenty-six volunteers were assigned to either the ball carrier (9), tackler (9) or control (8) group. Controls performed running without the tackle. Outcome measures included corticomotor function using transcranial magnetic brain stimulation (TMS) and balance was assessed by a series of tasks performed on a NeuroCom Balance Master before and immediately after a tackle training drill. Following the tackling bout, the cortical silent period (cSP) increased for the tacklers with no change for ball carrier and control groups, and no differences between groups for balance measures were observed. Lengthening of cSP observed in the tacklers following the bout has been reported in studies of concussion and may indicate long term detrimental effects.
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Akanni, Owolabi, Chunkai Fu, and Boyun Guo. "Drag Coefficients of Irregularly Shaped Particles in Newtonian Fluids." Sustainability 13, no. 14 (July 6, 2021): 7517. http://dx.doi.org/10.3390/su13147517.
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An accurate prediction of the settling velocities of drill cuttings is essential in effectively designing, running, and optimizing drilling operations. If there is no reliable process for modelling the drag coefficient, the settling velocity cannot be obtained. In most current literature, particles are assumed to be spherical, which can be easily modelled. However, this assumption may lead to inaccurate results for other irregular particle shapes. This paper studies the transport behavior of irregular particles by modelling these shapes as variants of a bow shape, with a numerical simulation approach for their drag coefficients. The drilling fluid around the particle is water (Newtonian). The drag coefficients of the non-spherical particle (grouped into three sub-shapes) were modelled. In addition, the inlet velocity of the fluid is varied to show the effects on the shape drag coefficients. The results of the simulations were compared to experimental results carried out by other researchers. It was observed that as the particles became less streamlined, their drag coefficient increased. A sensitivity analysis was carried out to investigate the effects of fluid properties on the drag coefficient. The results were consistent and logical. The results showed that Computational Fluid Dynamics analysis provided a reliable estimation of the drag coefficient, which can help optimize the transport of drill cuttings during drilling operations.
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Saputra, Hendra, Achmad Sofyan Hanif, Iman Sulaiman, Desy Tya Maya Ningrum, and Razali Razali. "The Effect of Traditional Games and Drill with Motor Ability on Skills (Running, Jumping, Overhand Throw and Catching) at Elementary School." International Journal of Human Movement and Sports Sciences 9, no. 6 (November 2021): 1097–103. http://dx.doi.org/10.13189/saj.2021.090603.
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Lizunov, Petro, and Valentyn Nedin. "The stability of rotating rods under the action of vibro-impact load." Strength of Materials and Theory of Structures, no. 106 (May 24, 2021): 113–21. http://dx.doi.org/10.32347/2410-2547.2021.106.113-121.
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The paper presents the investigation results of the vibro-impact loads’ influence on the stability of vibro-drilling machine’ drill-rod in the process of well in hard rock. The drilling process of such wells is significantly facilitated in case of vibro-impact action. The destroying of the rocks during the vibro-rotary drilling occurs via the complex effect of the vibration impulses and rotational motion. In this way, the task of such drill-rod study stability has actuality. In this case, the various modes of vibration and stability loss are possible. In this regard, the study was done by developed software, in which a technique of computer simulation of the oscillating motion of considerable length rotating rods under the action of axial periodic loads is implemented. Such software gives the possibility to model the oscillatory motion of rotating rods and determine the parameters by witch the dynamic stability loss of the studied system can occur. Using this software the diagrams with regions of stable and unstable motion of the rotating rod were drawn for different parameters of the considered system. The process of oscillation is considered in space with account of inertia forces and geometric nonlinearity of the rod. It is shown, that on certain rotational speeds and frequencies of vibro-impact load there are ranges of unstable motion where the run of equipment can inevitably lead to destruction. The obtained results have been analyzed. The conclusion about the possibility of running the equipment in certain frequency ranges is made.
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Demidov, V., V. Sivkov, A. Nazarenko, V. Demidova, and F. Mavliev. "ANAEROBIC PERFORMANCE AND MORPHOLOGICAL DEVELOPMENT OF YOUNG FOOTBALL PLAYERS DURING THE INITIAL PREPARATION STAGE." Human Sport Medicine 19, no. 4 (January 21, 2020): 20–28. http://dx.doi.org/10.14529/hsm190403.
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Aim. The purpose of the study is to determine the morphological features and anaerobic performance of young football players. Materials and methods. 20 young football players aged 12–13 years were examined. The anaerobic performance test was carried out on a Monark 891E hand ergometer (Sweden). Physical and technical preparedness was assessed with the following pedagogical tests: the 15 m standing and crouch start running test, standing long jump, vertical jump, 30-second running, 3×10 m 3×10 m shuttle run. Hip circumference as a morphological basis of anaerobic performance of the legs was evaluated by using a measuring tape. Body length and weight were measured by standard anthropometric methods. Results. The young football players have a significant heterochrony of morphological development, which is expressed in a significant dispersion of the parameters of body weight and length. At the same time, neither actual age nor training loads are the determining factors for the demonstrated strength, but the level of morphological development (i.e. biological age), as evidenced by the correlations between the hip circumference and absolute peak power (r = 0.75, at p = 0.0001). There are no similar correlations with age (both in years and in days). Technical tests, such as basketball dribbling, basketball ball handling drill, and shuttle running with the ball, as well as basketball obstacle course did not have statistically significant differences between more or less physically developed athletes. Conclusion. The approach to differentiation of athletes according to the development of speed-strength qualities based on morphofunctional data can be used in coaching practice when working with young athletes aged 12–13 years. This will allow coaches to plan training sessions aimed not at balancing differences, but at improving the training process taking into account the individual characteristics of an athlete.
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Fikri, Muhammad Dzul, Oce Wiriawan, and Achmad Widodo. "PENGARUH PELATIHAN LADDER DRILL DENGAN METODE ASCENDING DAN DESCENDING TERDADAP PENINGKATAN KECEPATAN DAN KELINCAHAN." Journal of Sport Science and Fitness 7, no. 1 (July 8, 2021): 1–8. http://dx.doi.org/10.15294/jssf.v7i1.43707.
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Abstrak
Penelitian ini dilatarbelakangi oleh penurunan prestasi atlet futsal SMA Antartika Sidoarjo. Penelitian ini bertujuan mengkaji pengaruh latihan Ladder Drill dengan metode latihan ascending dan metode latihan descending terhadap peningkatan kecepatan dan kelincahan pada siswa ekstrakurikuler futsal SMA Antartika Sidoarjo.
Jenis penelitian dalam penelitian ini adalah kuantitatif dengan metode quasi-experiment. Desain yang digunakan dalam penelitian adalah Pretest-Posttest Control Group Design yang dilaksanakan dalam 24 kali pertemuan dalam 8 minggu. Instrumen tes kecepatan menggunakan lari 40 meter, sedangkan instrumen kelincahan menggunakan shuttle run test. Analisis data yang digunakan untuk mengolah hasil penelitian menggunakan uji-t, MANOVA, dan Post Hoc dengan uji Scheffe.
Hasil penelitian menunjukkan peningkatan kecepatan dan kelincahan yang signifikan dari metode ascending dan descending. Sedangkan analisis post hoc uji Scheffe tidak terdapat perbedaan yang signifikan antara kelompok ascending dan kelompok descending terhadap kecepatan dan kelincahan.
Hasil penelitian ini menyimpulkan bahwa kedua metode ascending dan descending, dapat meningkatkan kecepatan dan kelincahan sama baiknya terhadap atlet futsal SMA Antartika Sidoarjo.
Abstract
This research was motivated by a decrease in the achievement of futsal athletes at SMA Antartika Sidoarjo. This study aims to examine the effect of ladder drill training with ascending training methods and descending training methods on increasing speed and agility in futsal extracurricular students at SMA Antartika Sidoarjo.
The type of research in this research is quantitative with a quasi-experimental method. The design used in the study was the Pretest-Posttest Control Group Design which was carried out in 24 meetings in 8 weeks. The speed test instrument uses 40 meters running, while the agility instrument uses the shuttle run test. Analysis of the data used to process the research results using the t-test, MANOVA, and Post Hoc with the Scheffe test.
The results showed a significant increase in speed and agility from the ascending and descending methods. While the post hoc analysis of the Scheffe test, there was no significant difference between the ascending and descending groups in terms of speed and agility.
The results of this study concluded that both ascending and descending methods can improve speed and agility as well as futsal athletes at SMA Antartika Sidoarjo.
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Ma, Guanchao, Xisheng Wang, Jianfeng Liu, Weibiao Chen, Qinghe Niu, Yun Liu, and Xiaocheng Gao. "Intelligent Detection of Foreign Matter in Coal Mine Transportation Belt Based on Convolution Neural Network." Scientific Programming 2022 (July 5, 2022): 1–10. http://dx.doi.org/10.1155/2022/9740622.
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This paper applies the CenterNet target detection algorithm to the foreign object detection of coal conveying belts in coal mines. Given the fast running speed of coal conveying belts and the influence of background and light sources on the objects to be inspected, an improved algorithm of CenterNet is proposed. First, the depth separable volume is introduced. The product replaces the standard convolution, which improves the detection efficiency. At the same time, the normalization method is optimized to reduce the consumption of computer memory. Finally, the weighted feature fusion method is added so that the features of each layer are fully utilized, and the detection accuracy is improved. The experimental results show that the improved algorithm has improved speed and accuracy compared with the original CenterNet algorithm. The foreign object detection algorithm proposed in this paper mainly detects coal gangue and can also detect iron tools such as bolts, drill bits, and channel steel. In the experimental environment, the average detection rate is about 20fps, which can meet the needs of real-time detection.
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Lizunov, Petro, Hryhorii Ivanchenko, and Valentyn Nedin. "The stability of shafts under the action of periodic axial loads." Strength of Materials and Theory of Structures, no. 107 (October 29, 2021): 257–64. http://dx.doi.org/10.32347/2410-2547.2021.107.257-264.
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The paper presents the investigation results of the harmonic periodic axial loads’ influence on the stability of shaft. Such loads can be appeared during the running of the vessel passing the turbulence zones from the side of the propeller to the shafting. In shafting, the influence of oscillatory motion performed in adjacent part, which is transmitted through the coupling due to longitudinal movements, can be periodic, too. Therefore, the question of the stability of such shafts during rotation is relevant. In this way, the task of such drill-rod study stability has actuality. In this case, the various modes of vibration and stability loss are possible. In this regard, the study was done by developed software, in which a technique of computer simulation of the oscillating motion of considerable length rotating rods under the action of axial periodic loads is implemented. Such software gives the possibility to model the oscillatory motion of rotating rods and determine the parameters by witch the dynamic stability loss of the studying system can occur. Using this software the diagrams with regions of stable and unstable motion of the rotating shaft were drawn for various parameters of the considered system. The process of oscillation is considered in space with account of inertia forces and geometric nonlinearity of the rod. It is shown, that on certain rotational speeds and frequencies of vibro-impact load there are ranges of unstable motion where the run of equipment can inevitably lead to destruction. The obtained results are analyzed. The conclusion about the possibility of running the equipment in certain frequency ranges is made.
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Florence, Angus, Mike Dow, George Shieh, and JV Babu. "Four-well comparison in Papua New Guinea: high-risk, high-angle wells demonstrate extended wellbore stability and faster drilling time with inhibitive high-performance water-based fluid." APPEA Journal 51, no. 1 (2011): 119. http://dx.doi.org/10.1071/aj10007.
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A four-well project located onshore Papua New Guinea provided an opportunity to compare the performance of two inhibitive drilling fluids in the problematic 12¼” interval. Wells A and B were drilled using a conventional KCl/glycol fluid. Wells C and D used a high-performance water-based fluid (HPWBF) containing a shale inhibitor that also provides lubricity. All four wells were drilled with the same rig. The base brine for both fluids was KCl. All hole sections were directionally drilled from vertical to near horizontal by section TD through a claystone interval. Tectonic wellbore breakout was present in all four wells, and the position of the breakout in the wellbore varied from well to well. Well A was regarded as the easiest well to drill due to the breakout being on the sides on the inclined well bore (horizontal), and Well D was regarded as being the most difficult well to drill due to the breakout being located directly on the top and bottom of the wellbore (vertical). Performance comparisons were made using on bottom rates of penetration, tripping times, casing running times, and overall hole section costs. These data have been normalised to remove non hole related NPT events. The KCl/glycol system provided sufficient wellbore stability in Wells A and B with horizontal breakouts and with non-optimal breakouts with very limited openhole exposure. For higher risk wells C and D with non-optimal breakout positions however, the HPWBF offered improved reliability and ensured there was no performance decline. Outstanding performance occurred in Well D where the HPWBF maintained good wellbore stability over a 56-day exposure. Although the KCl/glycol fluid had a lower cost/bbl, improved overall cost savings were achieved by using the HPWBF in the high-risk wells. This paper addresses all operations performed while drilling and casing the 12¼” interval. Possible causes for performance differences are evaluated, taking into account that mud systems represent only one variable. As other variables were introduced progressively, it was possible to back these out to determine mud system effectiveness.
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Sultoni, Adam, and Sri Subekti. "Process Production of Fishball Using Design of Fishball Moulding Machine in The Center of Testing The Application of Fishery (BBP2HP), Jakarta." Journal of Marine and Coastal Science 8, no. 1 (August 4, 2020): 49. http://dx.doi.org/10.20473/jmcs.v8i1.21146.
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Meatball is round-shaped food which contains meat as the basic ingredient and it becomes an original Indonesian food. Meatball can be made or created manually by hand or meatball machine. In this the modern era, a lot of meatball sellers are using meatball machine in order to get a maximum and desired meatball results therefore the meatball machine is needed to accelerate the production process, faster than manual process.Meatball machine can produce more meatball (1000 meatballs per day) compared with manual process which can only produce 200-400 meatballs per day. This internship was carried out to learn the production design for fish meatball production in BBP2HP through Triple screw with horizontal model. It consists of three basic process such as preparation, installation, and trial phase. The equipments which are used in running this system are masks, welding goggles, gloves, electrode, work outfit, saw blades, hammers, grinders, electric drill, hacksaw, lathes, work shoes, and sigmat. Meatball machine is designed with stainless steel and can easily be used. This machine has horizontal-shaped body (Length x Height x Wide = 848 x 500 x 313 mm), 200 watt electricity, 5 kilograms grinding capacity, and 120 meatballs per minute production speed. It is suitable for home scale production with low electricity to save the cost.
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Carpenter, Chris. "Technique Models Effect of Local Doglegs on Running of Completions and Casing in Hole." Journal of Petroleum Technology 73, no. 12 (December 1, 2021): 47–48. http://dx.doi.org/10.2118/1221-0047-jpt.
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This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 202431, “RSS and Motor Directional Analysis: Modeling the Effect of Local Doglegs on Running in Hole of Completions and Casing,” by Benjamin Nobbs, SPE, Stéphane Menand, SPE, and Ngoc-Ha Dao, SPE, DrillScan, prepared for the 2020 SPE Asia Pacific Oil and Gas Conference and Exhibition, originally scheduled to be held in Perth, Australia, 20–22 October. The paper has not been peer reviewed. Rotary steerable systems (RSS) and steerable motors pose unique challenges when modeling bottomhole-assembly (BHA) directional behavior. The complete paper presents a methodology that aims to allow the anticipation of problems such as mechanically stuck pipe or lockup situations when running in hole (RIH) casing or completion strings. Correctly evaluating the risk of BHA, casing, or completion strings being stuck or locked up when RIH can ultimately provide a template for ultimate reduction of nonproductive time. Local Doglegs and Downhole Equipment A pure rotary BHA has no ability to change its directional behavior during the run. Its directional capabilities are defined by stabilizer position and outer diameter, and, although no ability exists to control directional behavior directly, this type of BHA may be sensitive to weight on bit (WOB), mud weight, formation changes [unconfined compressive strength (UCS)], and inclination. With proper design, it is possible to design a rotary BHA that is insensitive to these parameters. A motor and turbine can operate with or without a bent housing. A bent housing imposes a small angle offset from the axis of the drillstring, with the result that two distinct modes of directional behavior occur, sliding and rotating. Because of its increased rotary speed, rotary mode is prioritized over sliding mode (ideally, 30% sliding and 70% rotating). Because a combination of these distinct drilling modes exists, the actual tortuosity may be quite different when compared with standard survey spacing (Fig. 1). A slight overgauge will be present when operating in rotating mode because of the bent sub. Much like a rotary BHA, a motor may be sensitive to operational parameters. The type of polycrystalline diamond compact bit recommended is one with a long passive gauge that is required to drill in the direction of bit tilt. An RSS can be modelled in two distinctive modes: point-the-bit and push-the-bit. A point-the-bit system operates in much the same way as a downhole motor by varying the tilt at bit. A push-the-bit system operates by applying a side force at pads that pushes against the wellbore. Both types of RSS allow continuous rotation of the drillstring and reduce the risk of differential sticking and, ultimately, stuck pipe. A point-the-bit system may operate with or without proportional steering. A push-the-bit RSS system can operate either by varying the magnitude of force or having a constant force that is varied for a set period in the desired tool-face orientation (TFO). Because of the method of activation (using pads that hit against the side of the wellbore), the local doglegs that can be induced are slightly higher.