Search Results - Ball, D. H~
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Advanced techniques to improve the design of tennis ball cores
Published 2019Get full text
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The effects of ball impact location and grip tightness on the arm, racquet and ball for one-handed tennis backhand groundstrokes
Published 2012“…A torque-driven, 3D computer simulation model of an arm–racquet system was used to investigate the effects of ball impact location and grip tightness on the arm, racquet and ball during one-handed tennis backhand groundstrokes. …”
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Milling a cement-based 3D printable mortar in its green state using a ball-nosed cutter
Published 2021Get full text
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Self-stabilizing balls and bins in batches: The power of leaky bins
Published 2018“…Moreover, for any (even super-exponential) round t, the maximum system load is (w.h.p.) O 1 1−λ· log n 1−λ for d = 1 and O log n 1−λ for d = 2. …”
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Validation of a technical intervention to correct an illegal bowling action using a smart cricket ball
Published 2024Get full text
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Self-stabilizing balls & bins in batches: The power of leaky bins [Extended Abstract]
Published 2016“…Moreover, for any (even superexponential) round t, the maximum system load is (w.h.p.) O ( 1/1-λ · log n/1-λ ) for d = 1 and O(log n/1-λ) for d = 2. …”
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Ball grid array-module with integrated shaped lens for WiGig applications in eyewear devices
Published 2016“…A maximum gain of 11 dBi is obtained at 60 GHz, with 24◦ and 96◦ beamwidth at 5-dBi gain, respectively, in the vertical and horizontal planes. …”
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The relationship between bowling intensity and ground reaction force in cricket pace bowlers
Published 2022“…Peak force and loading rate were significantly different across the three perceived intensity zones in the horizontal and vertical directions (Cohen’s d range = 0.14–0.45, p …”
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Supplementary information files for The relationship between bowling intensity and ground reaction force in cricket pace bowlers
Published 2023“…Peak force and loading rate were significantly different across the three perceived intensity zones in the horizontal and vertical directions (Cohen’s d range = 0.14–0.45, p …”
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Aerodynamics of an in-flight football using 3D particle tracking velocimetry
Published 2024Get full text
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3D printed utility dielectric core manufacturing process for antenna prototyping
Published 2018“…In this antenna, the mixed powders were encased in a 3D printed shell that achieved a reduction in diameter of the spherical antenna by a factor of 1.85. …”
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Application of 3D stereophotogrammetry for characterising dynamic association football kick launch parameters and flight trajectories
Published 2024“…However, 3D stereophotogrammetry, using a GOM Aramis system, applied with a high-speed video camera pair, has been utilised in golf ball tracking, with excellent accuracy and demonstrable benefits over other commercially available systems. …”
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Table tennis event detection and classification
Published 2015“…The research has four key considerations: i) an investigation into an effective recording environment with minimum configuration and calibration, ii) the selection and optimisation of a CV algorithm to detect the ball from the resulting single source video data, iii) validation of the accuracy of the 2-dimensional (2D) CV data for motion change detection, and iv) the data requirements and processing techniques necessary to automatically detect changes in ball motion and match those to match-play events. …”
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The influence of impairment type on the biomechanics of the wheelchair tennis serve technique
Published 2022“…Consequently, upper body, racket and ball 3D position data were collected to assist the investigation of the serve technique descriptors in WCT. …”
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Novel rework techniques for electronic assemblies
Published 1998Get full text
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Assessment of impact measurement data from low sampling rates.
Published 2024Get full text
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Transient analysis of isothermal elastohydrodynamic circular point contacts
Published 2001Get full text
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The use of geometrical simplification to model natural fibre composites.
Published 2024Get full text
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The effect of surface geometry on the aerodynamic behaviour of a football
Published 2023“…This study commissioned many 3D printed footballs with regularly increasing seam length and surface texture to undertake a designed experiment to study these changes in a controlled fashion. …”
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Assessment of the accuracy of different systems for measuring football velocity and spin rate in the field
Published 2019“…For ball velocity, the 2-D high-speed video had the smallest systematic error, followed by the radar gun, TrackMan and miCoach football at 0.2, 0.4, 0.5 and 4.8 m·s-1 , respectively. …”
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A biomechanical analysis of fast bowling variations
Published 2023“…This study investigated fast bowling pitch length delivery types using a full body three-dimensional kinematic and kinetic analysis. 21 county fast bowlers performed 48 deliveries (12 yorkers, 12 bouncers and 24 stock balls) with an eighteen camera (MX3) Vicon motion analysis system (250 Hz) and a Kistler force plate (1000 Hz) recording each trial. …”
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An investigation of elbow loading in one-handed tennis backhand groundstrokes using computer simulation
Published 2007“…Excellent agreement between performance and matching simulations was obtained with a mean RMS difference of 1.3% based on racket kinematics, outbound ball velocity and time of ball contact. …”
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The effect of uphill and downhill slopes on weight transfer, alignment and shot outcome in golf
Published 2018“…Twelve elite male golfers hit 30 shots with a six-iron from a computer assisted rehabilitation environment (CAREN) used to create 5° slopes while collecting 3D kinematics and kinetics of the swing. …”
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Stepovers and signal detection: Response sensitivity and bias in the differentiation of genuine and deceptive football actions
Published 2018“…High-skilled and low-skilled association football players judged whether a player genuinely intended to take the ball to the participant’s left or right or intended to step over the ball then take it in the other direction. …”
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The efficacy of a golf robot for simulating individual golfer's swings
Published 2007“…An extensive 3D kinematic study of golfers' swings was undertaken to determine joint positions representative of a double pendulum model of the swing along with ball launch and shaft deflection data. …”
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Next generation cricket bowling machine
Published 2009“…Existing cricket bowling machines do not offer batsmen pre-release visual information that they would receive in a match situation and the most popular models release moulded, dimpled balls that do not replicate the performance of cricket balls.... cont'd.…”
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Evaluation of a subject-specific, torque-driven computer simulation model of one-handed tennis backhand ground strokes
Published 2011“…Backhand strokes of an elite subject were recorded on an artificial tennis court. Over the 50-ms period after impact, good agreement was found with an overall RMS difference of 3.3° between matching simulation and performance in terms of joint and racket angles. …”
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A low-volume, low-cost method for Ti-Nb alloys in the selective laser melting process
Published 2022“…However, the porosity (2.1%) of the Ti-20Nb alloys fabricated with 110 J/mm3 energy density from the powder milled with Ca was higher than alloys fabricated from powder milled with stearic acid (0.2%). …”
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Some properties of a class of stochastic heat and wave equations with multiplicative Gaussian noises
Published 2015“…In the first case we choose Lu := ∂tu, we study the stochastic fractional heat equation of the form ∂tu(t, x) = ∆ α/2u(t, x) +λ σ(u(t, x))N˙ for t > 0, x ∈ B(0, R) ⊂ R d . …”
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The feasibility of sports grips customisation using rapid manufacturing methodologies
Published 2006“…In many sports where an implement is used to strike a ball, the grip is typically the sole point of contact between the player and implement. …”
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Additive manufacture of sodium beta alumina solid state battery electrolyte
Published 2023“…The calcination temperature for the BASE powder synthesis was investigated and 1250 oC was finally used. The particle size of the BASE powder was reduced to d50=1.12 μm by planetary ball-milling for extrusion-based 3D-printing afterwards. …”
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Development of a nanodiamond-based lubricant for a versatile use in the beverage industry conveyor systems
Published 2017“…Coefficients of friction and wear scars were measured and the lubricating performance quantified. A four-ball tester was used to characterise the performance of the nanolubricant as per ASTM D2783/D4172. …”
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Data-driven analysis of decision-making in football
Published 2024“…To address this challenge, we propose two novel methods to quantify individual pressure and team pressure, respectively. i For individual pressure quantification, we introduce a 2D measurement of the pressure on off-ball players with contextual information like the positions and speed of players and create an incisive 3D amplifier to fine-tune the 2D pressure into a more precise metric to quantify the pressure on the ball carrier. …”
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On-body near field confining spherical helical antennas
Published 2021“…The “on-body” characteristics were obtained with the antenna in contact with a phantom representing a wearer’s chest. The phantom had been developed using the above dielectric powders in a 3D printed frame and had passed basic tests to show that its performance was close to that of a live human upper chest.…”
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Knowledge is power? Outcome probability information impairs detection of deceptive intent
Published 2020“…Three probability conditions were used with respect to outcome direction: 50/50, 67/33, and 83/17. Participants responded by stepping on one of two corresponding pressure mats, as if attempting to intercept the player. …”
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The science of sports surface interactions for synthetic turf surfaces
Published 2008“…However, as part of a PhD research programme at Loughborough University, a comprehensive review of published literature was performed which highlighted a significant lack of quantified research and data regarding the surface properties influencing the traction developed at the shoe-surface interface. …”
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Structured biodegradable polymeric microparticles for drug delivery produced using flow focusing glass microfluidic devices
Published 2015“…The droplets with a coefficient of variation in dripping regime below 2.5 % were evaporated to form polymeric particles with uniform sizes ranging between 4-30 μm. …”
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Integrated inpection of sculptured surface products using machine vision and a coordinate measuring machine
Published 1996“…A graphical representation of the product model and errors has been developed using a 3-D solid modelling CAD system. …”
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