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Journal articles on the topic 'Impact speed'

Author: Grafiati

Published: 4 June 2021

Last updated: 19 June 2025

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1

Steel, Duncan. "Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics." International Astronomical Union Colloquium 161 (January 1997): 197–201. http://dx.doi.org/10.1017/s0252921100014718.

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AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbita

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2

Vertlberg, Juraj, Marijan Jakovljević, Marko Ševrović, and Kamer Shabanaj. "Speed Display Radars’ Impact on Speed Reduction on District Roads at Settlement Entrances." Sustainability 15, no. 4 (2023): 3099. http://dx.doi.org/10.3390/su15043099.

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Speed is one of the main causes of severe traffic accidents, especially of those involving vulnerable road users. Speed display radars are one of the engineering solutions that aim to reduce the speed of traffic flow at locations where it is crucial. A before and after study was conducted at six locations on district roads in the Republic of Croatia. As part of the research, vehicles’ speeds were measured for two weeks, during which the devices’ displays were switched off for one week and switched on for another, however, the devices’ radars recorded and collected the speeds of all vehicles wh

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Sanada, Toshiyuki, Keita Ando, and Tim Colonius. "Effects of Target Compliance on a High-Speed Droplet Impact." Solid State Phenomena 187 (April 2012): 137–40. http://dx.doi.org/10.4028/www.scientific.net/ssp.187.137.

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High speed spray cleaning which utilize droplets impact has been used for removing contaminants from wafer surface. When a droplet impacts a solid surface at high speed, the contact periphery expands very quickly and liquid compressibility plays an important role in the initial dynamics and the formation of lateral jets. Impact results in high pressures that can clean or damage the surface. In this study, we numerically investigated a high speed droplet impacts on a solid wall. In order to compare the available theory and experiments, 1D, 2D and axisymmetric solutions are obtained. The generat

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4

S., T. DJABBAROV. "CONSIDERATION OF AERODYNAMIC IMPACT IN SETTING THE MAXIMUM PERMISSIBLE SPEEDS OF HIGH-SPEED TRAIN." Science and Transport Progress, no. 5(71) (October 27, 2017): 61–70. https://doi.org/10.15802/stp2017/113192.

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<strong>Purpose.</strong> Studies of the effect of aerodynamic pressure on the maximum permissible speeds of a high-speed train on the existing railway infrastructure. <strong>Methodology.</strong> The study of the magnitude and direction of the aerodynamic pressure, its effect on the maximum speeds of a high-speed train was carried out on a train model composed of axisymmetric bodies with conical forms of head and tail parts. <strong>Findings.</strong> Determined the values of the aerodynamic pressure at different distances from the train are, when the high-speed trai

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5

Croft, Arthur C. "Low Speed Rear Impact Collisions:." Journal of Musculoskeletal Pain 4, no. 4 (1996): 39–46. http://dx.doi.org/10.1300/j094v04n04_05.

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6

Zhang, Long, Jia Dong Huang, Xian Xin Xu, and Xiong Pan. "Impact of Wind Speed Correlation on Transient Stability of Power System." Applied Mechanics and Materials 448-453 (October 2013): 2301–4. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2301.

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Wind speeds of different wind turbines in a big wind farm always have correlations because of their close geographical location. This paper builds wind speed model by t-copula function and uses rank correlation matrix to measure the correlation of wind speeds. The case study of IEEE-39 bus system and Yunnan Power Grid shows that wind speed correlation has certain effect on the transient stability of power system.Taking wind speed correlation into consideration makes the analysis of systems transient stability more close to reality.

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7

Ding, Yu, Zhuoying Tan, Shuguang Li, Runke Huo, Ziliang Liu, and Yong Ma. "Research on Tunnel Surrounding Rock Failure and Energy Dissipation Based on Cyclic Impact and Shear Loading." Advances in Civil Engineering 2021 (June 22, 2021): 1–15. http://dx.doi.org/10.1155/2021/8838695.

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Aiming at the cyclic impact deformation and failure of tunnel surrounding rock under shear stress, a self-developed rotation-impact simulation test platform was used to determine the number of failures, stress-strain curves, and energy in the process of cyclic impact failure. The failure process of rock under different impact velocities and shear stresses has been systematically studied. Results show that, under the same impact speed, the shear stress will increase with the increase in the rotation speed, but an upper limit will exist. When the rotation speed reaches this upper limit, the shea

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8

Xiao, Sen, Fuhao Mo, Jikuang Yang, Jing Huang, Zhi Xiao, and Jeff R. Crandall. "THE INFLUENCE OF IMPACT SPEED ON CHEST INJURY OUTCOME IN WHOLE BODY FRONTAL SLED IMPACTS." Transport 35, no. 6 (2021): 669–78. http://dx.doi.org/10.3846/transport.2020.14280.

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While the seatbelt restraint has significantly improved occupant safety, the protection efficiency still needs further enhance to reduce the consequence of the crash. Influence of seatbelt restraint loading on chest injury under 40 km/h has been tested and documented. However, a comprehensive profiling of the efficiency of restraint systems with various impact speeds has not yet been sufficiently reported. The purpose of this study is to analyse the effect of the seatbelt loadings on chest injuries at different impact speeds utilizing a high bio-fidelity human body Finite Element (FE) model. B

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9

Elhenawy, Mohammed, Hesham A. Rakha, and Huthaifa I. Ashqar. "Joint Impact of Rain and Incidents on Traffic Stream Speeds." Journal of Advanced Transportation 2021 (January 11, 2021): 1–12. http://dx.doi.org/10.1155/2021/8812740.

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Unpredictable and heterogeneous weather conditions and road incidents are common factors that impact highway traffic speeds. A better understanding of the interplay of different factors that affect roadway traffic speeds is essential for policymakers to mitigate congestion and improve road safety. This study investigates the effect of precipitation and incidents on the speed of traffic in the eastbound direction of I-64 in Virginia. To the best of our knowledge, this is the first study that studies the relationship between precipitation and incidents as factors that would have a combined effec

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10

Quistberg, D. Alex, Leah L. Thompson, James Curtin, Frederick P. Rivara, and Beth E. Ebel. "Impact of automated photo enforcement of vehicle speed in school zones: interrupted time series analysis." Injury Prevention 25, no. 5 (2018): 400–406. http://dx.doi.org/10.1136/injuryprev-2018-042912.

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ObjectiveMeasure the impact of automated photo speed enforcement in school zones on motorist speed and speeding violation rates during school travel.MethodsAutomated enforcement cameras, active during school commuting hours, were installed around four elementary schools in Seattle, Washington, USA in 2012. We examined the effect of automated enforcement on motorist speeds and speed violation rates during the citation period (10 December 2012 to 15 January 2015) compared with the ‘warning’ period (1 November to 9 December 2012). We evaluated outcomes with an interrupted time series approach usi

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11

Chen, Yue, Mark Jaksa, Brendan Scott, and Yien-Lik Kuo. "A numerical parametric study of the effectiveness of the 4-sided impact roller." Australian Geomechanics Journal 58, no. 2 (2023): 45–59. http://dx.doi.org/10.56295/agj5822.

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Rolling dynamic compaction (RDC) is a specific type of dynamic compaction, which involves towing a heavy non-circular module at a relatively constant speed. This paper investigates the effects of module mass, operating speed and varying ground conditions on the effectiveness of the 4-sided impact roller using a developed finite element method (FEM)-discrete element method (DEM) model. Numerical results were analysed from four aspects, namely the energy imparted to the ground, soil velocity vectors, module imprint lengths and soil displacements at different depths. It is found that, a heavier m

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12

Wall-Scheffler, Cara M. "Size and Shape: Morphology's Impact on Human Speed and Mobility." Journal of Anthropology 2012 (August 28, 2012): 1–9. http://dx.doi.org/10.1155/2012/340493.

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While human sexual dimorphism is generally expected to be the result of differential reproductive strategies, it has the potential to create differences in the energetics of locomotion and the speed at which each morph travels, particularly since people have been shown to choose walking speeds around their metabolic optimum. Here, people of varying sizes walked around a track at four self-selected speeds while their metabolic rate was collected, in order to test whether the size variation within a population could significantly affect the shape of the optimal walking curve. The data show that

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13

Bevilacqua, M., FE Ciarapica, A. Forcellese, and M. Simoncini. "Comparison among the environmental impact of solid state and fusion welding processes in joining an aluminium alloy." Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 234, no. 1-2 (2019): 140–56. http://dx.doi.org/10.1177/0954405419845572.

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The life-cycle assessment methodology was used to evaluate the environmental impact of friction stir welding of AA5754-H114 aluminium alloy sheets. Other works in literature considered the environmental impact of friction stir welding, but in this study the influence of different process parameters on midpoint category impacts were analysed. Friction stir welding was performed under different values of rotational and welding speeds. Moreover, pin tool wear and mechanical properties of joints were also evaluated. The pre- and post-processing stages were also considered. Raw materials, energy an

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14

Šavija, Ana, and Mladen Kulundžija. "Analysis of the impact of speed on traffic safety in the city of Banja Luka." Put i saobraćaj 69, no. 3 (2023): 51–57. http://dx.doi.org/10.31075/pis.69.03.08.

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Speed, as one of the basic parameters for the movement of an individual vehicle, is the main cause of traffic accidents. Inadequate speed often leads to traffic accidents with serious consequences, or often fatal accidents. By increasing the speed, visibility decreases, that is, it is more difficult to see other road users, which endangers their safety. By moving on the road, the vehicle achieves different speeds at different moments of time, that is, vehicles move at different speeds under the same road and ambient conditions. In this paper, an analysis of the impact of vehicle speed on traff

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15

Mullen, Maureen A., James H. Wilson, Laura Gottsman, Robert B. Noland, and William L. Schroeer. "Emissions Impact of Eliminating National Speed Limits: One Year Later." Transportation Research Record: Journal of the Transportation Research Board 1587, no. 1 (1997): 113–20. http://dx.doi.org/10.3141/1587-13.

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The National Highway System (NHS) bill passed by Congress in November 1995 eliminated the national maximum speed limit. It has allowed states to set their own speed limits, which many have changed during the past year. This analysis examines the impact of speed limit changes 1 year after passage of the NHS. Oxides of nitrogen (NOx), carbon monoxide, and volatile organic compounds are analyzed and are found to have increased nationwide by up to 6, 7, and 2 percent, respectively. Much of the increase has occurred in western states, which generally have increased vehicle speeds more than in easte

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16

Zhang, Weipeng, Shuxin Zhang, Yanshuang Gong, Shuyi Xie, Chao Wu, and Chuanjiang Tan. "Impact radius of light oil pipeline leakage under different operating conditions." Journal of Physics: Conference Series 2756, no. 1 (2024): 012042. http://dx.doi.org/10.1088/1742-6596/2756/1/012042.

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Abstract This study investigated the impact range of pipeline leaks for light oil pipelines under different operating conditions. Three different calculation methods were employed to study the influence of various factors, including obstacle height, wind speed, leak hole diameter, and slope, on the leak impact range of flowing fires, pool fires, and overpressure waves. The results indicate that the impact range decreases as the height of obstacles increases. The most significant decrease occurs when obstacles are 2 meters high, and further increasing the obstacle height leads to a less pronoun

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17

Hazim, N., L. Shbeeb, and Salem Z. Abu. "Impact of Roadside Fixed Objects in Traffic Conditions." Engineering, Technology & Applied Science Research 10, no. 2 (2020): 5428–33. https://doi.org/10.5281/zenodo.3748332.

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Highway Capacity Manual (HCM) assumes that traffic flow rates are equally distributed between lanes, which is not always the case. Lane distribution and speed are influenced by lateral clearance on the roadsides. In Jordan, the absence of well-marked lanes and poor lane discipline results in under-utilizing of the freeway capacity. The objective of this study is to look into the impact of the presence of roadside objects on lane distribution and speed. Test sections were selected on six-lane freeway segments located in sub-urban areas on tangent highway segments. Speed measurements and distrib

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18

Lee, Yan-Yin, Mohammad Falahat, and Bik-Kai Sia. "Impact of Digitalization on the Speed of Internationalization." International Business Research 12, no. 4 (2019): 1. http://dx.doi.org/10.5539/ibr.v12n4p1.

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Digitalization combined with globalization is the current megatrend that impacting the international business landscape and creates opportunities for new business models. Embracing digitalization enables firms for speedy internationalization. Although the phenomenon of early internationalization has received increasing attention in the field of International Entrepreneurship over the past decades, however, there is a lack of focus on the role of digitalization that allows a higher speed of internationalization. This paper proposes a model that highlights the moderating role of digitalization o

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19

Khammar, A. J. "Impact of Amblyopia on Reading Speed." AAP Grand Rounds 35, no. 4 (2016): 45. http://dx.doi.org/10.1542/gr.35-4-45.

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20

McNitt-Gray, Jill L. "LANDING STRATEGY ADJUSTMENTS TO IMPACT SPEED." Medicine and Science in Sports and Exercise 21, Supplement (1989): S88. http://dx.doi.org/10.1249/00005768-198904001-00527.

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21

Patel, Tanuj, and Vinod Vasudevan. "Impact of speed humps of bicyclists." Safety Science 89 (November 2016): 138–46. http://dx.doi.org/10.1016/j.ssci.2016.06.012.

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22

Chen, Y. P., A. Eskandarian, M. Oskard, and J. D. Lee. "Meshless analysis of high-speed impact." Theoretical and Applied Fracture Mechanics 44, no. 3 (2005): 201–7. http://dx.doi.org/10.1016/j.tafmec.2005.09.007.

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23

Uuemõis, H., H. Kangur, and I. Veerus. "Wear in high-speed impact mills." International Journal of Mineral Processing 44-45 (March 1996): 301–13. http://dx.doi.org/10.1016/0301-7516(95)00041-0.

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24

SHI, Hong-Hui, and John P. DEAR. "Oblique High-Speed Liquid-Solid Impact." JSME international journal. Ser. 1, Solid mechanics, strength of materials 35, no. 3 (1992): 285–95. http://dx.doi.org/10.1299/jsmea1988.35.3_285.

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25

Ravid, M., S. R. Bodner, and I. Holcman. "Analysis of very high speed impact." International Journal of Engineering Science 25, no. 4 (1987): 473–82. http://dx.doi.org/10.1016/0020-7225(87)90073-5.

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26

Davies, P. A., and F. P. Lees. "Impact speed of heavy goods vehicles." Journal of Hazardous Materials 26, no. 2 (1991): 213–17. http://dx.doi.org/10.1016/0304-3894(91)80006-a.

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27

Warner, Mary. "AGU Journals Increase Speed and Impact." Eos, Transactions American Geophysical Union 95, no. 33 (2014): 298. http://dx.doi.org/10.1002/2014eo330007.

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28

Takeda, Arisa, Yasuki Motozawa, Marin Takaso, Mami Nakamura, Shinobu Hattori, and Masahito Hitosugi. "Mechanisms of Negative Fetal Outcome in Frontal Vehicle Collisions Involving Unbelted Pregnant Drivers." Healthcare 9, no. 1 (2020): 25. http://dx.doi.org/10.3390/healthcare9010025.

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To determine the cause of negative fetal outcomes and the causative mechanism in a frontal collision, we analyzed the kinematics and mechanisms of injuries using an unbelted pregnant dummy, the Maternal Anthropometric Measurement Apparatus dummy, version 2B. Sled tests were performed to recreate frontal impact situations with impact speeds of 13, 26, and 40 km/h. Overall kinematics of the dummy were examined through high-speed video imaging. Quantitative dummy responses—such as time courses of the abdominal pressure, chest deflection, neck injury criteria (Nij), and displacement of the pelvis

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Kandula, Rajesh, and Chinnababu Anima. "High - Speed Savior: Exploring Formula One's HALO Frame using Impact Simulations." International Journal of Science and Research (IJSR) 8, no. 11 (2019): 1999–2002. http://dx.doi.org/10.21275/sr24119231329.

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30

Zhang, Jinwei, Xijing Zhu, and Jing Li. "SPH–FEM Analysis of Effect of Flow Impingement of Ultrasonic Honing Cavitation Microjet on Titanium–Tantalum Alloy Surface." Micromachines 15, no. 1 (2023): 38. http://dx.doi.org/10.3390/mi15010038.

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To investigate the machining effect of ultrasonic honing microjets on a titanium–tantalum alloy surface, a cavitation microjet flow impingement model was established using the smoothed particle hydrodynamics–finite element method (SPH–FEM) coupling method including the effects of wall elastic–plastic deformation, the ultrasonic field and the honing pressure field. Simulation analysis was conducted on a single impact with different initial speeds and a continuous impact at a constant initial speed. The results showed that the initial speed of the microjet needed to reach at least 580 to 610 m/s

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31

Islam, Md Tazul, Karim El-Basyouny, and Shewkar E. Ibrahim. "The impact of lowered residential speed limits on vehicle speed behavior." Safety Science 62 (February 2014): 483–94. http://dx.doi.org/10.1016/j.ssci.2013.10.006.

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32

Hashim, Ibrahim H., Rania M. Badawy, and Usama Heneash. "Impact of Pavement Defects on Traffic Operational Performance." Sustainability 15, no. 10 (2023): 8293. http://dx.doi.org/10.3390/su15108293.

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The present research investigates the influence of pavement distresses on traffic operational performance in terms of speed and capacity. The pavement distresses are expressed by the pavement condition index (PCI). Three roads of multi-lane highways located on the road network of Kafrelsheikh governorate, Egypt, were chosen as a case study. Road geometry, pavement condition characteristics, and traffic volume were collected manually from 23 sections for field data surveys. For speed measurements, spot speed data were gathered using the stopwatch method under the free-flow conditions, and the p

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33

Abd Samad, Faisal Ikram, Mohd Yuzri Mohd Yusop, Nik Mohd Ridzuan Shaharuddin, Nasrudin Ismail, and Omar Bin Yaakob. "SLAMMING IMPACT ACCELERATIONS ANALYSIS ON SMALL HIGH SPEED PASSENGER CRAFTS." Brodogradnja 72, no. 1 (2021): 79–94. http://dx.doi.org/10.21278/brod72104.

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Small high speed passenger crafts (HSC) are commonly known for their poor seakeeping qualities. These crafts are frequently exposed to large slamming impacts and these repetitive shocks may pose danger to passengers’ safety and health. In Malaysia, small high speed passenger crafts having lengths between 7 to 9 meters are mainly used to transport tourists between popular island destinations. Evaluation on impact and vibration for this type of craft was conducted by using accelerometers attached to several locations on craft’s deck. The test was conducted at speeds ranged between 20 to 30 knots

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34

Gustås, Pia, Christopher Johnston, Ulf Hedenström, Lars Roepstorff, and Stig Drevemo. "A field study on hoof deceleration at impact in Standardbred trotters at various speeds." Equine and Comparative Exercise Physiology 3, no. 3 (2006): 161–68. http://dx.doi.org/10.1017/ecp200694.

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AbstractImpact-related peak decelerations with high loading rates are described as indicators of mechanical stress to the limb. The hoof deceleration pattern in the beginning of the stance phase has recently been described, together with ground reaction force measurements at slow speed; however, no information is available at high speeds. The objective of the present study was to investigate the hoof deceleration pattern following impact at slow speeds, comparable to earlier force plate studies, and at high speeds on a racetrack. Eight Standardbreds equipped with triaxial accelerometers mounte

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35

Kuvik, Tomáš, Jozef Krilek, Ján Kováč, and Ján Melicherčík. "Impact of cutting speed and feed rate for cross cutting with saw chains." BioResources 16, no. 3 (2021): 5341–49. http://dx.doi.org/10.15376/biores.16.3.5341-5349.

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This article examined the impact of cutting speed and feed rate on the process of cross cutting with a saw chain. Three cutting speeds and three feed rates were chosen, and their impact on energy intensity was evaluated. The measurements were performed on an experimental device, on which it is possible to set the rpm (cutting speed) and the feed rate into the section using frequency converters. The cutting speed influences the resulting energy efficiency, at a cutting speed (vc) of 5.02 m × s-1 the resulting power (P) was 485 W. With increasing speed the cutting power increased, where the maxi

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36

Boonchouytan, Worapong, Jaknarin Chatthong, and Rommador Burapa. "Analysis of the impact factors from the friction stir welding process for dissimilar butt joints between semi-solid cast aluminum 356 and AISI 1018 carbon steel." Journal of Metals, Materials and Minerals 31, no. 2 (2021): 1–9. http://dx.doi.org/10.55713/jmmm.v31i2.1003.

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This research aimed to study the impacts of three different rotation speeds of 710, 1000, and 1400 rpm and three welding speeds of 40, 56, and 80 mm·min-1, on dissimilar butt joints between semi-solid aluminum 356 and AISI 1018 carbon steel. Welding tools were made from tungsten carbide material, and the offset was 0 mm. It was found that an increase in the rotation speed and welding speed caused accumulated heat, which led to the appropriate changes in the metallurgical structure. The rotation speed and welding speed factors had the impact on the greater blending of the two metals at the SZ z

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37

Olowosegun, Adebola, Grigorios Fountas, and Adrian Davis. "Assessing the Impact of 20 mph Speed Limits on Vehicle Speeds in Rural Areas: The Case of the Scottish Borders." Safety 9, no. 3 (2023): 66. http://dx.doi.org/10.3390/safety9030066.

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This paper aims at delivering new empirical evidence as to the effectiveness of 20 mph speed limits in rural areas. For this purpose, speed and traffic data were drawn from the area of the Scottish Borders, UK, where the local Council led the rollout of a 20 mph speed limit trial in 97 villages and towns from October 2020. This intervention is considered as one of the first of its kind in the UK and overseas, as it was carried out on a large scale, in predominantly rural areas. To evaluate the impact of the 20 mph speed limit on vehicle speeds, we conducted a “before–after” quantitative analys

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Fondzenyuy, Stephen Kome, Blair Matthew Turner, Alina Florentina Burlacu, et al. "The Impact of Speed Limit Change on Emissions: A Systematic Review of Literature." Sustainability 16, no. 17 (2024): 7712. http://dx.doi.org/10.3390/su16177712.

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In the pursuit of sustainable mobility and the decarbonization of transport systems, public authorities are increasingly scrutinizing the impact of travel speed on emissions within both low-speed and high-speed environments. This study critically examines the evidence concerning emission impacts associated with speed limit changes in different traffic environments by conducting a systematic review of the literature in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. A total of 25 studies that met the eligibility criteria were assessed.

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Oke, Sunday Ayoola, Ayokunle Bamigbaiye, Oluwafemi Isaac Oyedokun, and Oliver Ekpere Charles-Owaba. "A MATHEMATICAL MODEL TO SET SPEED LIMITS FOR VEHICLES ON THE HIGHWAY." TRANSPORT 21, no. 4 (2006): 278–83. http://dx.doi.org/10.3846/16484142.2006.9638079.

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The purpose of this paper is to develop a mathematical model that could guide certain speed limits for vehicles on roads. Excessive speeds on roads have been a major indirect cause of deaths on highways due to the sudden impact of vehicles that lead to accidents. The model presented here is developed on a measure of impact force of two vehicles engaged in a head‐on collision. A hypothetical case study was investigated based on the impact of force on the human body. The results showed a variation of speed with occupation position distance. The paper also examines the role of seatbelt as a safet

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40

Januševičius, Tomas, and Rasa Akelaitytė. "Speed bumps impact on motor transport noise." Baltic Journal of Road and Bridge Engineering 10, no. 2 (2015): 191–99. http://dx.doi.org/10.3846/bjrbe.2015.24.

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Most accidents are caused by excessive speed or aggressive driver behavior. One of the most popular speed regulation implement is speed bumps. However, there are some problems with speed bumps as well – it has been noticed that speed bumps increase motor vehicle-induced noise. This article presents investigation on how speed bumps increase motor vehicle-induced noise. The investigations were carried out on Klaipėda and Vilnius streets during different time of the day and year. Brüel&Kjær sound level meters type 2260 and 2270 were used to investigate how much noise is caused by vehicles pas

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Al-Nabhani, Majid Hamed, Mohammad Sayeed Hossain, and Khaled Giasin. "Low-speed impact on structural integrity of aluminum alloy Al1050." Engineering Solid Mechanics 13, no. 1 (2025): 117–24. https://doi.org/10.5267/j.esm.2024.7.001.

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Low-speed impacts are common occurrences in industries such as aviation, automotive, and marine. Yet they have received relatively little attention compared to medium and high-speed impacts. Understanding the behavior of materials under low-speed impact is crucial for ensuring impact resistance and damage absorption in engineering structures. This study presents an experimental investigation into the low-speed impact behavior of 1050 aluminum alloy plates. Impact tests were conducted using a CEAST 9340 drop-weight testing machine, varying impact energies and temperatures to analyze their effec

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Draxl, Caroline, Rochelle P. Worsnop, Geng Xia, et al. "Mountain waves can impact wind power generation." Wind Energy Science 6, no. 1 (2021): 45–60. http://dx.doi.org/10.5194/wes-6-45-2021.

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Abstract. Mountains can modify the weather downstream of the terrain. In particular, when stably stratified air ascends a mountain barrier, buoyancy perturbations develop. These perturbations can trigger mountain waves downstream of the mountains that can reach deep into the atmospheric boundary layer where wind turbines operate. Several such cases of mountain waves occurred during the Second Wind Forecast Improvement Project (WFIP2) in the Columbia River basin in the lee of the Cascade Range bounding the states of Washington and Oregon in the Pacific Northwest of the United States. Signals fr

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Sultana, Tahmina, and Yasser Hassan. "Impact of Mixed-Vehicle Environment on Speed Disparity as a Measure of Safety on Horizontal Curves." World Electric Vehicle Journal 15, no. 10 (2024): 456. http://dx.doi.org/10.3390/wevj15100456.

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Due to the transition of vehicle fleets from conventional driver-operated vehicles (DVs) to connected vehicles (CVs) and/or automated vehicles (AVs), vehicles with different technologies will soon operate on the same roads in a mixed-vehicle environment. Although a major goal of vehicle connectivity and automation is to improve traffic safety, negative safety impacts may persist in the mixed-vehicle environment. Speed disparity measures have been shown in the literature to be related to safety performance. Therefore, speed disparity measures are derived from the expected speed distributions of

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Vescovi, Jason D. "Impact of Maximum Speed on Sprint Performance During High-Level Youth Female Field Hockey Matches: Female Athletes in Motion (FAiM) Study." International Journal of Sports Physiology and Performance 9, no. 4 (2014): 621–26. http://dx.doi.org/10.1123/ijspp.2013-0263.

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The aim of this study was to examine the impact of maximum sprint speed on peak and mean sprint speed during youth female field hockey matches. Two high-level female field hockey teams (U-17, n = 24, and U-21, n = 20) were monitored during a 4-game international test series using global position system technology and tested for maximum sprint speed. Dependent variables were compared using a 3-factor ANOVA (age group, position, and speed classification); effect sizes (Cohen d) and confidence limits were also calculated. Maximum sprint speed was similar between age groups and positions, with fas

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Sakhare, Rahul Suryakant, Yunchang Zhang, Howell Li, and Darcy M. Bullock. "Impact of Rain Intensity on Interstate Traffic Speeds Using Connected Vehicle Data." Vehicles 5, no. 1 (2023): 133–55. http://dx.doi.org/10.3390/vehicles5010009.

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With the emergence of connected vehicle data and high-resolution weather data, there is an opportunity to develop models with high spatial-temporal fidelity to characterize the impact of weather on interstate traffic speeds. In this study, 275,422 trip records from 41,234 unique journeys on 42 rainy days in 2021 and 2022 were obtained. These trip records are categorized as no rain, slight rain, moderate rain, heavy rain, and very heavy rain periods using the precipitation rate from NOAA High-Resolution Rapid-Refresh (HRRR) data. It was observed that average speeds decreased by approximately 8.

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Ocholi, M., K. E. Ibe, E. E. Iheonu, and E. E. Ameh. "Assessing Wind Impact on Noise Level Measurements for Application in Architectural Acoustics: A Preliminary Study." Nigerian Journal of Environmental Sciences and Technology 5, no. 2 (2021): 413–19. http://dx.doi.org/10.36263/nijest.2021.02.0290.

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In this study, we have used wind data obtained from an earlier work covering several locations in Nigeria to estimate the possible impact of wind on sound pressure levels. Estimated Weibull parameters were used to compute the most probable wind speed, the average wind speed and the duration for which wind speed exceeds or equal the most probable speed. Adopting the proposed criteria that wind is able to strengthen or weaken sound pressure levels by 3dB depending on wind direction, the effect of wind on sound pressure level was determined. Results showed that wind effect seemed more predominant

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Zhao, Manhong, and Rui Su. "The Impact of High-speed Railway Opening on Economic Growth in Heilongjiang Province." Frontiers in Sustainable Development 3, no. 8 (2023): 19–25. http://dx.doi.org/10.54691/fsd.v3i8.5513.

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With the arrival of China's high-speed rail era, it greatly shortens the distance of time and space, and speeds up the flow of economic factors. This paper selects the panel data of 11 prefecture-level cities in Heilongjiang Province except the provincial capital from 2014 to 2021, and uses the multi-period difference-difference method to analyze the impact of high-speed railway construction on the urban economic development of Heilongjiang Province. The results show that in the short term, high-speed railway construction can promote the economic development of Heilongjiang Province.

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Wang, Xinghua, Yong Peng, and Shengen Yi. "Comparative analyses of bicyclists and motorcyclists in vehicle collisions focusing on head impact responses." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 231, no. 11 (2017): 997–1011. http://dx.doi.org/10.1177/0954411917723674.

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To investigate the differences of the head impact responses between bicyclists and motorcyclists in vehicle collisions. A series of vehicle–bicycle and vehicle–motorcycle lateral impact simulations on four vehicle types at seven vehicle speeds (30, 35, 40, 45, 50, 55 and 60 km/h) and three two-wheeler moving speeds (5, 7.5 and 10 km/h for bicycle, 10, 12.5 and 15 km/h for motorcycle) were established based on PC-Crash software. To further comprehensively explore the differences, additional impact scenes with other initial conditions, such as impact angle (0, π/3, 2π/3 and π) and impact positio

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Nguyen Huu Thanh. "Impact of trawling speed on vertical opening of trawl net by modelling method." Tạp chí Khoa học - Công nghệ Thủy Sản, Trường Đại học Nha Trang, no. 04 (December 30, 2018): 078–83. http://dx.doi.org/10.53818/jfst.04.2018.420.

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This study was conducted to find out the relations between trawling speed and vertical opening of trawl net. The study uses a trawl model to perform a test in a flume tank at various trawling speeds, from 0.46 m/s to 1.08 m/s, this is equivalent from1.5 knots to 3.5 knots in the field for full-scale net. The results show that the vertical opening of the net mouth decreases as the trawling speed increases, the vertical opening was reduced by more than 32% as the speed increased from 1.5 knots to 3.5 knots. The regression results show that there is an approximate relationship between trawling sp

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Wu, Nai Qun, and Yao Jun Shi. "Impact on Perceptual Speed to Geometry Pattern." Applied Mechanics and Materials 274 (January 2013): 567–70. http://dx.doi.org/10.4028/www.scientific.net/amm.274.567.

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After the research on the velocity perception, and the analysis and studies to the effect generated from various illusion forms of movement pattern speed, surveys of perceptual speed and physical speed differences, know the features of impacting the speed to perceive the special design. Form an interest that reflects a picture on the road of the geometry impact. Through the study, then prove the relationship and influence factors between the perceptual speed and geometry, which makes contribution to research development of road mode.

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