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Articoli di riviste sul tema "Accelerationer"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 13 febbraio 2022

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1

Loveikin, Viacheslav, Konstantyn Pochka, Nikolay Pristaylo, and Olga Pochka. "Substantiation of Boundary Accelerations of Roller Forming Unit Optimal Reversal Mode According to Fourth-Order Acceleration." Journal of Mechanical Engineering 22, no. 1 (2019): 38–52. http://dx.doi.org/10.15407/pmach2019.01.038.

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2

FEOLI, ANTONIO. "MAXIMAL ACCELERATION OR MAXIMAL ACCELERATIONS?" International Journal of Modern Physics D 12, no. 02 (2003): 271–79. http://dx.doi.org/10.1142/s0218271803002706.

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3

Long, Gary. "Acceleration Characteristics of Starting Vehicles." Transportation Research Record: Journal of the Transportation Research Board 1737, no. 1 (2000): 58–70. http://dx.doi.org/10.3141/1737-08.

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Abstract (sommario):

Acceleration characteristics of starting vehicles are needed for many transportation analysis and design purposes involving driveways, turning bays, intersecting streets, traffic signals, railroad crossings, simulation software, and so forth. Constant acceleration is sometimes assumed, or AASHTO Green Book values based on piecewise-constant accelerations are sometimes adopted. However, continuing research has shown that linearly decreasing acceleration rates better represent both maximum vehicle acceleration capabilities and actual motorist behavior. It is not acceleration that usually is cons

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4

JEON, HYEONG-MIN, JI-WON KIM, YURI KWON, JAE-HOON HEO, EUI-BUM CHOI, and GWANG-MOON EOM. "UPPER BODY ACCELERATIONS DURING LOCOMOTION IN DIFFERENT AGE GROUPS AND GENDERS." Journal of Mechanics in Medicine and Biology 17, no. 07 (2017): 1740026. http://dx.doi.org/10.1142/s0219519417400267.

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Aim: The purpose of this study is to measure the acceleration of upper body (pelvis, shoulder and head) during walking and to investigate whether the acceleration patterns differ among age groups and genders. Methods: Twenty-nine old subjects and thirty young subjects participated in this study. Tri-axial accelerations were measured on the back of upper body (head, shoulder and pelvis). Subjects performed two trials of walking on a treadmill in their own comfortable speeds. Three-way ANOVA (repeated measures) was carried out for the root mean square of each directional acceleration with age, g

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5

Ma, Kemao, and Xiaoyu Zhang. "A Novel Guidance Law with Line-of-Sight Acceleration Feedback for Missiles against Maneuvering Targets." Mathematical Problems in Engineering 2014 (2014): 1–8. http://dx.doi.org/10.1155/2014/983751.

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Terminal guidance law design and its implementation are considered for homing missiles against maneuvering targets. The lateral acceleration dynamics are taken into account in the design. In the guidance law design, the line-of-sight acceleration signals are incorporated into the acceleration reference signals to compensate for the targets’ maneuvers. Then the commanded accelerations are designed and the convergent tracking of the lateral accelerations to these signals is proven theoretically. In the guidance implementation, a linear high-gain differentiator is used to estimate the line-of-sig

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6

Liu, Zhi Xin, Yue Zhang, and Ming Jiang Wei. "Prediction on Vehicle Crash Acceleration Based on Circle of Constant Acceleration Method." Applied Mechanics and Materials 380-384 (August 2013): 51–54. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.51.

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Vehicle crash acceleration was essential for automotive passive safety analysis. Especially in CAE analysis and sled test, B-pillar lower accelerations are considered as vehicle acceleration and often used as crash pulse to reproduce the real crash conditions. But for frontal offset impact, the magnitudes and directions of the B-pillars lower accelerations were significantly different,which made the selection of vehicle acceleration very complicate. In this paper,a prediction algorithm based on Circle of Constant Acceleration method that can calculate the acceleration of any point on vehicle w

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7

Lajunen, Timo, Juha Karola, and Heikki Summala. "Speed and Acceleration as Measures of Driving Style in Young Male Drivers." Perceptual and Motor Skills 85, no. 1 (1997): 3–16. http://dx.doi.org/10.2466/pms.1997.85.1.3.

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This study investigated different measures of speed and acceleration as indicators of safe driving style. 58 young males drove a 7.1-km test route twice in an instrumented car. Drivers were instructed to drive as they usually do. Driving style was measured by both site-specific measures (speed on a crest and speed and lateral acceleration in a sharp and a gentle curve) and general measures (maximum speed and lateral and longitudinal accelerations over the route). Analysis of variance (accident involvement × mileage) showed that drivers who had had prior accidents drove at higher speed and high

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8

Wilson, T. A., and S. Liu. "Effect of acceleration on the chest wall." Journal of Applied Physiology 76, no. 3 (1994): 1242–46. http://dx.doi.org/10.1152/jappl.1994.76.3.1242.

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The gravitational force on the rib cage has been found to be an expiratory force of approximately 8 cmH2O. The gravitational force on the abdomen is an inspiratory force of the same magnitude. Because the compliance of the rib cage is greater than the compliance of the abdomen, it follows that gravity has a net expiratory effect on lung volume and that upward accelerations augmenting the gravitational force would have an additional expiratory effect. This conclusion is contrary to observations that functional residual capacity increases during headward accelerations in centrifuges and during i

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9

Boroushak, Neda, Hasan Khoshnoodi, and Mostafa Rostami. "Investigation of the Head’s Dynamic Response to Boxing Punch Using Computer Simulation." Montenegrin Journal of Sports Science and Medicine 10, no. 1 (2021): 31–35. http://dx.doi.org/10.26773/mjssm.210305.

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Head injuries are dangerous injuries that are common in combat sports. Nevertheless, the mechanisms of concussion in sport have are not precisely known. Thus, this study aimed to investigate the dynamic response of the head based on linear and rotational accelerations in boxing using computer simulation. The ADAMS software model was used to determine the linear and rotational acceleration of boxing’s straight punch. The peak linear acceleration, average linear acceleration, peak rotational acceleration, and average rotational acceleration resulted from the straight punch to head were obtained:

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10

Nedergaard, Niels J., Mark A. Robinson, Elena Eusterwiemann, Barry Drust, Paulo J. Lisboa, and Jos Vanrenterghem. "The Relationship Between Whole-Body External Loading and Body-Worn Accelerometry During Team-Sport Movements." International Journal of Sports Physiology and Performance 12, no. 1 (2017): 18–26. http://dx.doi.org/10.1123/ijspp.2015-0712.

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Purpose:To investigate the relationship between whole-body accelerations and body-worn accelerometry during team-sport movements.Methods:Twenty male team-sport players performed forward running and anticipated 45° and 90° side-cuts at approach speeds of 2, 3, 4, and 5 m/s. Whole-body center-of-mass (CoM) accelerations were determined from ground-reaction forces collected from 1 foot–ground contact, and segmental accelerations were measured from a commercial GPS accelerometer unit on the upper trunk. Three higher-specification accelerometers were also positioned on the GPS unit, the dorsal aspe

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11

Campbell, K. W. "The Whittier Narrows, California Earthquake of October 1, 1987—Preliminary Analysis of Peak Horizontal Acceleration." Earthquake Spectra 4, no. 1 (1988): 115–37. http://dx.doi.org/10.1193/1.1585468.

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The Ml=5.9 Whittier Narrows, California, earthquake triggered several hundred accelerographs in the greater Los Angeles area. One-hundred and sixty-eight of these were used to develop attenuation relationships for peak horizontal acceleration. The analysis indicates that the attenuation of peak acceleration during the earthquake was generally consistent with that predicted from the attenuation relationships of Campbell (in press). However, the acceleration amplitudes were about 65-percent higher than predicted. An analysis of residuals clearly showed that the ground motions recorded during thi

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12

Elvin, Niell G., Alex A. Elvin, Steven P. Arnoczky, and Michael R. Torry. "The Correlation of Segment Accelerations and Impact Forces with Knee Angle in Jump Landing." Journal of Applied Biomechanics 23, no. 3 (2007): 203–12. http://dx.doi.org/10.1123/jab.23.3.203.

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Impact forces and shock deceleration during jumping and running have been associated with various knee injury etiologies. This study investigates the influence of jump height and knee contact angle on peak ground reaction force and segment axial accelerations. Ground reaction force, segment axial acceleration, and knee angles were measured for 6 male subjects during vertical jumping. A simple spring-mass model is used to predict the landing stiffness at impact as a function of (1) jump height, (2) peak impact force, (3) peak tibial axial acceleration, (4) peak thigh axial acceleration, and (5)

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13

Stevens, Tom G. A., Cornelis J. de Ruiter, Cas van Niel, Roxanne van de Rhee, Peter J. Beek, and Geert J. P. Savelsbergh. "Measuring Acceleration and Deceleration in Soccer-Specific Movements Using a Local Position Measurement (LPM) System." International Journal of Sports Physiology and Performance 9, no. 3 (2014): 446–56. http://dx.doi.org/10.1123/ijspp.2013-0340.

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Purpose:A local position measurement (LPM) system can accurately track the distance covered and the average speed of whole-body movements. However, for the quantification of a soccer player’s workload, accelerations rather than positions or speeds are essential. The main purpose of the current study was therefore to determine the accuracy of LPM in measuring average and peak accelerations for a broad range of (maximal) soccerspecific movements.Methods:Twelve male amateur soccer players performed 8 movements (categorized in straight runs and runs involving a sudden change in direction of 90° or

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14

Dong, Xue Ming, Wei Guan, and Xiao Feng Meng. "Combined Accelerations Produced by Vibrafuge." Applied Mechanics and Materials 543-547 (March 2014): 971–74. http://dx.doi.org/10.4028/www.scientific.net/amm.543-547.971.

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Various environmental factors will adversely influence accelerometers working in the field. Mixed inputs, including external causes and the intended acceleration, are important contributors to the problem. As a consequence, calibrating accelerometers with multiple accelerations is required by manufacturers and customers. We introduce a multi-component mechanical system called vibrafuge to provide multiple accelerations. In this paper, we deduce a general model of the accelerations reproduced by an ideal vibrafuge with homogeneous transformation of matrix. Based on the model, we have an element

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15

Jaarsveld, H. W. L. van, H. J. Grootenboer, and J. De Vries. "Accelerations due to impact at heel strike using below-knee prosthesis." Prosthetics and Orthotics International 14, no. 2 (1990): 63–66. http://dx.doi.org/10.3109/03093649009080323.

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The acceleration in the sagittal plane of the prosthetic tube at heel strike in normal walking was measured in five healthy amputees with their definitive below-knee prosthesis, every subject using six different prosthetic feet, wearing sport shoes as well as leather shoes. The experiments were carried out in the rehabilitation centre “Het Roessingh”, Enschede, The Netherlands. Maximum accelerations were extracted from the acceleration-time-signal. Mean acceleration maxima of all subjects were calculated for each foot-shoe combination to eliminate the individual influence of the subjects. In t

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16

Asias, A., M. Shusser, A. Leitner, A. Nabi, and G. Grossman. "Instability of Heat Pipe Performance at Large Axial Accelerations." Journal of Heat Transfer 129, no. 2 (2006): 137–40. http://dx.doi.org/10.1115/1.2402177.

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To investigate the feasibility of using heat pipes in airborne systems, heat pipe performance at large axial accelerations in the range of 3–12g was studied experimentally. The heat input chosen corresponded to the optimal heat pipe performance without acceleration. When applied against the direction of the liquid flow (unfavorable orientation) the accelerations were large enough to exceed the capillary limit, as was seen from the strong increase in the evaporator temperature. The influence of accelerations in the direction of the liquid flow (favorable orientation) was found to be more compli

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17

Blouin, Jean-Sébastien, Gunter P. Siegmund, and J. Timothy Inglis. "Interaction between acoustic startle and habituated neck postural responses in seated subjects." Journal of Applied Physiology 102, no. 4 (2007): 1574–86. http://dx.doi.org/10.1152/japplphysiol.00703.2006.

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Postural and startle responses rapidly habituate with repeated exposures to the same stimulus, and the first exposure to a seated forward acceleration elicits a startle response in the neck muscles. Our goal was to examine how the acoustic startle response is integrated with the habituated neck postural response elicited by forward accelerations of seated subjects. In experiment 1, 14 subjects underwent 11 sequential forward accelerations followed by 5 additional sled accelerations combined with a startling tone (124-dB sound pressure level) initiated 18 ms after sled acceleration onset. Durin

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18

Krupych, O., V. Banha, N. Veremeychyk, and S. Krupych. "Investigation of accelerations of branch shaking and walnut fruit separation." Mehanization and electrification of agricultural, no. 10(109) (2019): 101–9. http://dx.doi.org/10.37204/0131-2189-2019-10-9.

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Purpose. Improvement of the efficiency of technical means for shaking walnut fruits due to the rationale for the marginal accelerations of branch shaking and fruit separation. Methods. The basic principles of conducting a field experiment using modern measuring equipment for measuring acceleration in the tree crown, as well as methods of planned experiment and statistical data processing were used. Results. The acceleration of the skeletal branches shaking at the point of capture, the acceleration of fruit separation and the values of the coefficient of transfer of accelerations from the place

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19

Neira, Alejandro, Tomas Amenabar, Iver Cristi-Sánchez, et al. "Evaluation of atraumatic hip instability measured by triaxial accelerometry during walking." Journal of Hip Preservation Surgery 6, no. 2 (2019): 134–39. http://dx.doi.org/10.1093/jhps/hnz018.

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AbstractHip joint instability has been targeted as an important issue that affects normal hip function. The diagnosis of hip instability could be very challenging and currently, there is no definitive diagnostic test. Hip instability results in an excessive amount of translation of femoroacetabular articulation, leading to changes on the dynamic loading of the hip. These changes in femoroacetabular translation could be evaluated by human movement analysis methods. The purpose of this study was to describe the triaxial and overall magnitude of acceleration in patients diagnosed with hip instabi

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20

Aubol, Kevin G., Jillian L. Hawkins, and Clare E. Milner. "Tibial Acceleration Reliability and Minimal Detectable Difference During Overground and Treadmill Running." Journal of Applied Biomechanics 36, no. 6 (2020): 457–59. http://dx.doi.org/10.1123/jab.2019-0272.

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Measurements of tibial acceleration during running must be reliable to ensure valid results and reduce errors. The purpose of this study was to determine the reliability and minimal detectable difference (MDD) of peak axial and peak resultant tibial acceleration during overground and treadmill running. The authors also compared reliability and MDDs when peak tibial accelerations were determined by averaging 5 or 10 trials. Tibial acceleration was measured during overground and treadmill running of 19 participants using a lightweight accelerometer mounted to the tibia. Peak axial and peak resul

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21

Price, N. S. C., S. Ono, M. J. Mustari, and M. R. Ibbotson. "Comparing Acceleration and Speed Tuning in Macaque MT: Physiology and Modeling." Journal of Neurophysiology 94, no. 5 (2005): 3451–64. http://dx.doi.org/10.1152/jn.00564.2005.

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Studies of individual neurons in area MT have traditionally investigated their sensitivity to constant speeds. We investigated acceleration sensitivity in MT neurons by comparing their responses to constant steps and linear ramps in stimulus speed. Speed ramps constituted constant accelerations and decelerations between 0 and 240°/s. Our results suggest that MT neurons do not have explicit acceleration sensitivity, although speed changes affected their responses in three main ways. First, accelerations typically evoked higher responses than the corresponding deceleration rate at all rates test

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22

Rousseau, P., and T. B. Hoshizaki. "The influence of deflection and neck compliance on the impact dynamics of a Hybrid III headform." Proceedings of the Institution of Mechanical Engineers, Part P: Journal of Sports Engineering and Technology 223, no. 3 (2009): 89–97. http://dx.doi.org/10.1243/17543371jset34.

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The objective of this study was to determine the influence of impact deflection and neck compliance on the Gadd severity index (GSI), peak linear acceleration, and peak angular acceleration during a front impact to a Hybrid III head using a pneumatic linear impactor. Impact deflection was performed by translating the headform laterally and was shown to be effective at reducing the linear and angular accelerations as well as the GSI. Neck compliance was altered using one Hybrid III 50th percentile neck and two modified Hybrid III necks. A less compliant neck increased linear acceleration but de

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23

Sleep, Norman H., and Nori Nakata. "Nonlinear Rheology at Shallow Depths with Reference to the 2016 Kumamoto Earthquakes." Bulletin of the Seismological Society of America 109, no. 6 (2019): 2674–90. http://dx.doi.org/10.1785/0120180200.

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Abstract Strong S waves produce dynamic stresses, which bring the shallow subsurface into nonlinear inelastic failure. We examine implications of nonlinear viscous flow, which may be appropriate for shallow muddy soil, and contrast them with those of Coulomb friction within a shallow reverberating uppermost layer with low‐seismic velocities. Waves refract into essentially vertical paths at the shallow layers and produce tractions on horizontal planes. The Coulomb ratio of shear traction to lithostatic stress for S waves equals the resolved horizontal acceleration normalized to the acceleration

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Hoshino, Masahiro. "Nonthermal Particle Acceleration in Shock Front Region: “Shock Surfing Accelerations"." Progress of Theoretical Physics Supplement 143 (2001): 149–81. http://dx.doi.org/10.1143/ptps.143.149.

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Lou, Bo, Yonghai Qiu, and Jianhong Xu. "Characteristics of diffusion flames with accelerated motion." Thermal Science 20, no. 6 (2016): 2113–24. http://dx.doi.org/10.2298/tsci150413180l.

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The aim of this work is to present an experiment to study the characteristics of a laminar diffusion flame under acceleration. A Bunsen burner (nozzle diameter 8 mm), using liquefied petroleum gas as its fuel, was ignited under acceleration. The temperature field and the diffusion flame angle of inclination were visualised with the assistance of the visual display technology incorporated in MATLAB?. Results show that the 2-d temperature field under different accelerations matched the variation in average temperatures: they both experience three variations at different time and velocity stages.

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Echaveguren, Tomás, Cristian Henríquez, and Gustavo Jiménez-Ramos. "Longitudinal Acceleration Models for Horizontal Reverse Curves of Two-Lane Rural Roads." Baltic Journal of Road and Bridge Engineering 15, no. 1 (2020): 103–25. http://dx.doi.org/10.7250/bjrbe.2020-15.463.

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The operating speed profile models adopt acceleration and deceleration as constant values obtained from kinematic models, assuming that the operating speeds between two consecutive sections are not spatially correlated. Existent research shows that acceleration and deceleration in horizontal reverse curves (HRC) depend on the tangent length and curve radii. In this paper, accelerations/decelerations-geometry models for light cars are proposed. The models are based on the data obtained in-field with a 10 Hz GPS under favourable traffic, weather, and pavement condition to isolate the effect of r

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Negrean, Iuliu, Adina-Veronica Crișan, and Sorin Vlase. "A New Approach in Analytical Dynamics of Mechanical Systems." Symmetry 12, no. 1 (2020): 95. http://dx.doi.org/10.3390/sym12010095.

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This paper presents a new approach to the advanced dynamics of mechanical systems. It is known that in the movements corresponding to some mechanical systems (e.g., robots), accelerations of higher order are developed. Higher-order accelerations are an integral part of higher-order acceleration energies. Unlike other research papers devoted to these advanced notions, the main purpose of the paper is to present, in a matrix form, the defining expressions for the acceleration energies of a higher order. Following the differential principle in generalized form (a generalization of the Lagrange–D’

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Roberts, Thomas J., and Jeffrey A. Scales. "Mechanical power output during running accelerations in wild turkeys." Journal of Experimental Biology 205, no. 10 (2002): 1485–94. http://dx.doi.org/10.1242/jeb.205.10.1485.

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SUMMARYWe tested the hypothesis that the hindlimb muscles of wild turkeys(Meleagris gallopavo) can produce maximal power during running accelerations. The mechanical power developed during single running steps was calculated from force-plate and high-speed video measurements as turkeys accelerated over a trackway. Steady-speed running steps and accelerations were compared to determine how turkeys alter their running mechanics from a low-power to a high-power gait. During maximal accelerations, turkeys eliminated two features of running mechanics that are characteristic of steady-speed running:

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Torromé, Ricardo Gallego. "Maximal acceleration geometries and spacetime curvature bounds." International Journal of Geometric Methods in Modern Physics 17, no. 04 (2020): 2050060. http://dx.doi.org/10.1142/s0219887820500607.

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A geometric framework for metrics of maximal acceleration which is applicable to large proper accelerations is discussed, including a theory of connections associated with the geometry of maximal acceleration. In such a framework, it is shown that the uniform bound on the proper maximal acceleration implies a uniform bound for certain bilinear combinations of the Riemannian curvature components in the domain of the spacetime where curvature is finite.

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Gellner, Ryan A., Eamon T. Campolettano, Eric P. Smith, and Steven Rowson. "Are specific players more likely to be involved in high-magnitude head impacts in youth football?" Journal of Neurosurgery: Pediatrics 24, no. 1 (2019): 47–53. http://dx.doi.org/10.3171/2019.2.peds18176.

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OBJECTIVEYouth football attracts approximately 3.5 million participants every year, but concern has recently arisen about the long-term effects of experiencing repetitive head accelerations from a young age due to participation in football. The objective of this study was to quantify total involvement in high-magnitude impacts among individual players in youth football practices. The authors explored the relationship between the total number of high-magnitude accelerations in which players were involved (experienced either by themselves or by other players) during practices and the number of h

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Woodward, M. I., and J. L. Cunningham. "Skeletal Accelerations Measured during Different Exercises." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 207, no. 2 (1993): 79–85. http://dx.doi.org/10.1243/pime_proc_1993_207_274_02.

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Exercise is often suggested as a means of reducing the effects of osteoporosis in post-menopausal women. In response to an increase in physical activity, bone mass can be increased and several studies have investigated the effectiveness of different exercises in increasing bone mass. In this study we have attempted to quantify the effect of different exercises by measuring the accelerations produced during various exercises. Accelerations have been measured at the ankle of normal subjects during a series of impulsive (walking, running and walking up and down stairs) and non-impulsive (cycling)

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HUA, BACH LIEN, JAMES C. McWILLIAMS, and PATRICE KLEIN. "Lagrangian accelerations in geostrophic turbulence." Journal of Fluid Mechanics 366 (July 10, 1998): 87–108. http://dx.doi.org/10.1017/s0022112098001001.

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A distinctive property of Lagrangian accelerations in geostrophic turbulence is that they are governed by the large and intermediate scales of the flow, both in time and space, so that the inertial part of the dynamics plays a much larger role than in three-dimensional turbulence where viscous effects are stronger. For the case of geostrophic turbulence on a β-plane, three terms contribute to the Lagrangian accelerations: the ageostrophic pressure gradient which often is the largest term, a meridional acceleration due to the β-effect, and an acceleration due to horizontally divergent ageostrop

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PALASRI, CHITTI, and ANAT RUANGRASSAMEE. "PROBABILISTIC SEISMIC HAZARD MAPS OF THAILAND." Journal of Earthquake and Tsunami 04, no. 04 (2010): 369–86. http://dx.doi.org/10.1142/s179343111000087x.

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In this study, the probabilistic seismic hazard map of Thailand and neighboring areas is developed. Thailand is located close to the Andaman thrust in the west and the Sunda arc in the south which are the boundaries between the Eurasian plate and Indo-Australian plate. Several active faults in this region have caused earthquakes which affects Thailand. Earthquakes recorded from 1912 to 2006 by the Thai Meteorological Department and the US Geological Survey are used in the analysis. Two attenuation models for active tectonic regions which give good correlations with actual measured acceleration

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Morrow, Melissa M. B., Wendy J. Hurd, Emma Fortune, Vipul Lugade, and Kenton R. Kaufman. "Accelerations of the Waist and Lower Extremities Over a Range of Gait Velocities to Aid in Activity Monitor Selection for Field-Based Studies." Journal of Applied Biomechanics 30, no. 4 (2014): 581–85. http://dx.doi.org/10.1123/jab.2013-0264.

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This study aimed to define accelerations measured at the waist and lower extremities over a range of gait velocities to provide reference data for choosing the appropriate accelerometer for field-based human activity monitoring studies. Accelerations were measured with a custom activity monitor (± 16g) at the waist, thighs, and ankles in 11 participants over a range of gait velocities from slow walking to running speeds. The cumulative frequencies and peak accelerations were determined. Cumulative acceleration amplitudes for the waist, thighs, and ankles during gait velocities up to 4.8 m/s we

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İz, H. Bâki. "Sea level acceleration under the magnifier." Journal of Geodetic Science 11, no. 1 (2021): 7–13. http://dx.doi.org/10.1515/jogs-2020-0118.

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Abstract Detection and quantification of sea level accelerations at tide gauge stations are needed for assessing anthropogenic contributions to the climate change. Nonetheless, uniform or non-uniform sea level accelerations/decelerations are particularly di˚cult to discern partly because of their small magnitudes and partly because of the low frequency sea level variations as confounders. Moreover, noisy excursions in the observed sea level variations also exacerbate reliability of estimated sea level accelerations. This study explores the uniformity of a sea level acceleration graphically tha

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Ma, Li Jie, Xi Bin Wang, and Yong Feng Li. "Influence of Cutting Parameters on Vibration Acceleration in Micro-End-Milling." Applied Mechanics and Materials 457-458 (October 2013): 439–42. http://dx.doi.org/10.4028/www.scientific.net/amm.457-458.439.

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In order to reveal the change rule of vibration acceleration during micro-end-milling straight groove, the single-factor and orthogonal experiments are employed to confirm the influence of milling parameters on vibration acceleration. On this basis, the relation equation between milling parameters and vibration accelerations is built. The result show that, the vibration acceleration along the width of groove is bigger than that of feed direction and it will increase rapidly with the improve of cutting speed; the predicted result of vibration acceleration is in good accordance with test result,

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Wang, Yu Suo, Ke Yue Zhang, Jian Hui Tang, and Dong Liang. "Model Test Research of the Influences of Rock-Fall Impaction on Accelerations of the Cut-and-Cover Tunnel Structure." Applied Mechanics and Materials 117-119 (October 2011): 206–11. http://dx.doi.org/10.4028/www.scientific.net/amm.117-119.206.

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On conditions of different weight and height, the tunnel portal structure’s accelerations evoked by rock-fall impaction have been researched in laboratory by using a 1/30 scale similar model. The study shows that the normal acceleration value is the biggest, the lateral acceleration is second and the longitudinal acceleration is the minimum. There is a simple linear relationship between the structure’s acceleration, the rock weight and the rockfall height when the slope gradient is 1:0.5 and the slope surface is slippery. The multiple linear relationship between the structure’s normal accelera

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38

Terashi, Hiroo, Hiroya Utsumi, Yohei Ishimura, et al. "Deficits in Scaling of Gait Force and Cycle in Parkinsonian Gait Identified by Long-Term Monitoring of Acceleration with the Portable Gait Rhythmogram." ISRN Neurology 2012 (October 16, 2012): 1–8. http://dx.doi.org/10.5402/2012/306816.

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To examine the range of gait acceleration and cycle in daily walking of patients with Parkinson’s disease (PD), we compared the gait of 40 patients with PD and 17 normal controls by using a newly developed long-term monitoring device that extracts gait-related accelerations from overall movements-related accelerations. The range of change in gait acceleration, relative to the control, was less than 75% in 12 patients. The range of change in gait cycle was less than 75% in 8 patients. The range of changes in both parameters was less than 75% in 4 patients. The results suggest narrow changes in

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Denny, M., and B. Gaylord. "Why the urchin lost its spines: hydrodynamic forces and survivorship in three echinoids." Journal of Experimental Biology 199, no. 3 (1996): 717–29. http://dx.doi.org/10.1242/jeb.199.3.717.

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Two species of sea urchins (Colobocentrotus atratus and Echinometra mathaei) commonly co-occur on wave-swept intertidal shores in the Indo West Pacific. E. mathaei is a typical spiny urchin and is confined to cavities in the rock. In contrast, C. atratus has an unusual morphology, in which the spines are much reduced, and is found on substrata fully exposed to wave-induced velocities and accelerations. Previous researchers have suggested that spine reduction may therefore be a morphological adaptation to hydrodynamic forces. However, measurement of the drag, lift and accelerational forces on s

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40

Trafimow, Jordan, and Alexander S. Aruin. "The Use of Negative Acceleration as Accessory Force during Lifting." Advances in Orthopedics 2018 (December 2, 2018): 1–4. http://dx.doi.org/10.1155/2018/9164590.

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Abstract (sommario):

Objectives. Injury associated with lifting, especially low back injury, is a big problem in industry that accounts for loss of work and high medical expenses. Studies of biomechanics of lifting provide a basis for optimization of lifting. The aim of the study was to further investigate the role of the upward force due to negative acceleration during a lift. Methods. Nine healthy subjects lifted an empty box and a box with additional load of 10, 20, and 25 lb. Kinematic data were recorded during the lifts and accelerations were calculated, and angular positions of the trunk and knee were obtain

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41

Abraczinskas, Alicia, Ardyn Olszko, Christine Beltran, et al. "A Comparison of Nonhuman Primate Injuries in Horizontal Versus Vertical Sled +Gz (Head-to-Foot) Impact Accelerations." Military Medicine 186, Supplement_1 (2021): 610–18. http://dx.doi.org/10.1093/milmed/usaa354.

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ABSTRACT Introduction Accelerative events commonly expose military pilots to potentially injurious + Gz (axial, caudal to cranial) accelerations. The Naval Biodynamics Laboratory exposed nonhuman primates (NHPs) to + Gz loading in two subject orientations (supine or upright) to assess the effect of orientation and accelerations associated with injury at accelerations unsafe for human participation. Materials and Methods Archived care records, run records, and necropsy and pathology reports were used to identify acceleration-related injuries. Injuries were categorized as central nervous system

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42

Bender, L. C., N. L. Guinasso, J. N. Walpert, and S. D. Howden. "A Comparison of Methods for Determining Significant Wave Heights—Applied to a 3-m Discus Buoy during Hurricane Katrina." Journal of Atmospheric and Oceanic Technology 27, no. 6 (2010): 1012–28. http://dx.doi.org/10.1175/2010jtecho724.1.

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Abstract In August 2005, the eye of Hurricane Katrina passed 90 km to the west of a 3-m discus buoy deployed in the Mississippi Sound and operated by the Central Gulf of Mexico Ocean Observing System (CenGOOS). The buoy motions were measured with a strapped-down, 6 degrees of freedom accelerometer, a three-axis magnetometer, and from the displacement of a GPS antenna measured by postprocessed-kinematic GPS. Recognizing that an accelerometer experiences a large offset due to gravity, the authors investigated four different means of computing wave heights. In the most widely used method for a bu

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Bechtel, S. E., S. Vohra, K. I. Jacob, and C. D. Carlson. "The Stretching and Slipping of Belts and Fibers on Pulleys." Journal of Applied Mechanics 67, no. 1 (1999): 197–206. http://dx.doi.org/10.1115/1.321164.

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Abstract (sommario):

We derive the equations of motion for an extensible belt on a pulley in which all effects of inertia, including (for the first time) acceleration due to stretching, are retained in the momentum balance. These equations are also valid for fibers and films on rollers undergoing cold draw. We apply our equations to the problem of torque transmission by a belt between two pulleys, and compare the resulting solution to solutions in which centrifugal acceleration is included but stretching acceleration is neglected (the common engineering practice), and the solution in which both centrifugal and str

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Reina, María, Javier García-Rubio, José Pino-Ortega, and Sergio J. Ibáñez. "The Acceleration and Deceleration Profiles of U-18 Women’s Basketball Players during Competitive Matches." Sports 7, no. 7 (2019): 165. http://dx.doi.org/10.3390/sports7070165.

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Abstract (sommario):

The ability of a player to perform high-intensity actions can be linked to common requirements of team sports, and the ability to accelerate can be an important factor in successfully facing the opponent. The aim of this study was to determine the acceleration and deceleration profiles of U-18 women’s basketball players during competitive matches. This study categorized accelerations and decelerations by playing position and quarter. Forty-eight U-18 female basketball players from the same Spanish league participated in this study. Each player was equipped with a WimuProTM inertial device. Acc

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Peleg, Kalman, and Shabtai Shpigler. "Dynamic Matching of Acceleration Transducers." Journal of Dynamic Systems, Measurement, and Control 108, no. 4 (1986): 306–13. http://dx.doi.org/10.1115/1.3143799.

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Abstract (sommario):

Small mismatches between similarly manufactured accelerometers stem from slight differences between their flexural elements, seismic masses and their mountings, as well as variations in damping ratios. This is not detrimental for measuring absolute accelerations, but when it is desired to measure differential accelerations, very large errors may result. This is probably the main reason why transducers for measuring differential acceleration are not generally commercially available. Measuring the differential acceleration between two accelerometers mounted in different locations of an item prov

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46

Papini, Giorgio. "Maximal acceleration and radiative processes." Modern Physics Letters A 30, no. 31 (2015): 1550166. http://dx.doi.org/10.1142/s0217732315501667.

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Abstract (sommario):

We derive the radiation characteristics of an accelerated, charged particle in a model due to Caianiello in which the proper acceleration of a particle of mass [Formula: see text] has the upper limit [Formula: see text]. We find two power laws, one applicable to lower accelerations, the other more suitable for accelerations closer to [Formula: see text] and to the related physical singularity in the Ricci scalar. Geometrical constraints and power spectra are also discussed. By comparing the power laws due to the maximal acceleration (MA) with that for particles in gravitational fields, we find

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47

Hernandez-Martin, Antonio, Javier Sanchez-Sanchez, Jose Luis Felipe, et al. "Physical Demands of U10 Players in a 7-a-Side Soccer Tournament Depending on the Playing Position and Level of Opponents in Consecutive Matches Using Global Positioning Systems (GPS)." Sensors 20, no. 23 (2020): 6968. http://dx.doi.org/10.3390/s20236968.

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Abstract (sommario):

The aim of this study was to analyse the physical demands of U10 players in a 7-a-side-soccer tournament based on the playing positions in 6 consecutive matches by global positioning systems (GPS). Variables of total distance, relative distance in different speed zones, maximum speed, time interval between accelerations, maximum speed acceleration, maximum acceleration, acceleration distance and the number of high-intensity accelerations were analysed. Differences between playing positions were found in the total distance covered by the midfielders. They covered higher total distances than the

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48

Song, Ying, Lei Liang, Yanliang Du, and Baochen Sun. "Railway Polygonized Wheel Detection Based on Numerical Time-Frequency Analysis of Axle-Box Acceleration." Applied Sciences 10, no. 5 (2020): 1613. http://dx.doi.org/10.3390/app10051613.

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Abstract (sommario):

The increasing need for repairs of polygonized wheels on high-speed railways in China is becoming problematic. At high speeds, polygonized wheels cause abnormal vibrations at the wheel-rail interface that can be detected via axle-box accelerations. To investigate the quantitative relationship between axle-box acceleration and wheel polygonization in both the time and frequency domains and under high-speed conditions, a dynamics model was developed to simulate the vehicle-track coupling system and that considers both wheel and track flexibility. The calculated axle-box accelerations were analyz

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49

Madigan, Edwin F., and Katherine R. Lehman. "Factors Affecting Productivity and Ergonomics of Supermarket Checkers." Proceedings of the Human Factors and Ergonomics Society Annual Meeting 40, no. 7 (1996): 419–23. http://dx.doi.org/10.1177/154193129604000710.

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Abstract (sommario):

A field study was conducted to examine scanning productivity and ergonomic issues as a function of scanner technology and product type. Cashiers performed both normal and staged activities using bi-optic and flat-bed scanners. In Phase One of the study, package handling and throughput were examined. Overall, bi-optic scanning was faster and some package types were handled more efficiently. Some package types, however, were handled less optimally (i.e., flipping and twisting scans). In phase two of the study, wrist acceleration measures were examined as a function of scanner technology and pack

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50

Belardinelli, E., M. Ursino, G. Fabbri, A. Cevese, and F. Schena. "Pressure Changes Induced by Whole Body Acceleration Shocks." Journal of Biomechanical Engineering 113, no. 1 (1991): 27–29. http://dx.doi.org/10.1115/1.2894081.

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Abstract (sommario):

In the present paper pressure changes induced by sudden body acceleration are studied “in vivo” on the dog and compared to the results obtainable with a recently developed mathematical model. A dog was fixed to a movable table, which was accelerated by a compressed air piston for less than 1 s. Acceleration was varied by changing the air pressure in the piston. Pressure was measured during the experiment at different points along the vascular bed. However, only data obtained in the carotid artery and abdominal aorta are presented here. The results demonstrated that impulse body accelerations c

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