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Journal articles on the topic 'Decelerated motion'

Author: Grafiati

Published: 3 June 2025

Last updated: 19 July 2025

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1

Afanasiev, G. N., and V. G. Kartavenko. "Cherenkov-like shock waves associated with surpassing the light velocity barrier." Canadian Journal of Physics 77, no. 7 (1999): 561–69. http://dx.doi.org/10.1139/p99-053.

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The effects arising from the accelerated and decelerated motion of a point charge inside a medium are studied. The motion is manifestly relativistic and may be produced by a constant uniform electric field. It is shown that in addition to the bremsstrahlung and Cherenkov shockwaves, the electromagnetic shock wave arises when the charged-particle velocity coincides with the light velocity in the medium. For the accelerated motion, this shock wave, forming an indivisible entity with the Cherenkov shock wave, arrives after the arrival of the bremsstrahlung shock wave. For the decelerated motion t

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2

Kotvytska, Klavdiia, and Zuzana Ješková. "Study of circular and rotational motion with the help of experimentation and mathematical modeling enhanced by digital technologies." Journal of Physics: Conference Series 2715, no. 1 (2024): 012018. http://dx.doi.org/10.1088/1742-6596/2715/1/012018.

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Abstract Circular and rotational motion belongs to basic topics studied at upper secondary school and courses on Mechanics at University. Many studies show problems in understanding basic concepts related to kinematics and dynamics of these motions. In this paper we present a series of inquiry activities aimed at developing the understanding of these concepts and the laws of circular and rotating motion with the effective use of digital technologies. The activity on the videomeasurement of a uniform and decelerating bicycle wheel motion analyses the basic kinematic concepts. In the experiments

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3

Popescu, Paul, and Marcela Popescu. "On a cotangent form of a nonholonomic lagrangian dynamics." ITM Web of Conferences 34 (2020): 03012. http://dx.doi.org/10.1051/itmconf/20203403012.

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A Lagrangian form of dynamic equations for nonlinear nonholonomic constraints was studied by the ﬁrst author in a previous paper. The aim of this paper is to put these equations in a cotangent form, according to some regularity conditions. It is particularized as an example to a decelerated motion of a free particle, when some dual simple equations are obtained.

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4

Moriwaki, Tohru. "Consideration on Dynamics of Decelerated Ascent Motion of Grains in Inclined Disc Pelletizer." Journal of the Society of Powder Technology, Japan 38, no. 7 (2001): 473–81. http://dx.doi.org/10.4164/sptj.38.473.

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5

Glovnea, Romeo P., and Hugh A. Spikes. "Behavior of EHD Films During Reversal of Entrainment in Cyclically Accelerated/Decelerated Motion." Tribology Transactions 45, no. 2 (2002): 177–84. http://dx.doi.org/10.1080/10402000208982537.

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DE OLIVEIRA, H. P., I. DAMIÃO SOARES, and E. V. TONINI. "BLACK HOLE BREMSSTRAHLUNG: CAN IT BE AN EFFICIENT SOURCE OF GRAVITATIONAL WAVES?" International Journal of Modern Physics D 15, no. 12 (2006): 2203–8. http://dx.doi.org/10.1142/s0218271806009625.

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We propose a new source of gravitational waves in the context of full nonlinear General Relativity: the black hole bremsstrahlung. A black hole initially in uniform motion is decelerated along its direction of motion; as a consequence of the deceleration, a radiative transfer process is set up through which the black hole loses its kinetic energy along with part of its rest mass by the emission of gravitational waves. Depending on the initial velocity and the strength of the deceleration, this process can correspond to a high power output in the initial pulse of gravitational radiation emitted

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7

SCHAFFER, NICOLE, LUKE COPLAND, and CHRISTIAN ZDANOWICZ. "Ice velocity changes on Penny Ice Cap, Baffin Island, since the 1950s." Journal of Glaciology 63, no. 240 (2017): 716–30. http://dx.doi.org/10.1017/jog.2017.40.

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ABSTRACTPredicting the velocity response of glaciers to increased surface melt is a major topic of ongoing research with significant implications for accurate sea-level rise forecasting. In this study we use optical and radar satellite imagery as well as comparisons with historical ground measurements to produce a multi-decadal record of ice velocity variations on Penny Ice Cap, Baffin Island. Over the period 1985–2011, the six largest outlet glaciers on the ice cap decelerated by an average rate of 21 m a−1 over the 26 year period (0.81 m a−2), or 12% per decade. The change was not monotonic,

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8

Zhang, Qiujie, Huiming Shen, Xiufeng Qin, and Tianguo Lü. "Research on Acceleration Segmented Compensation Strategy for Backlash of CNC Machine Tools." Journal of Physics: Conference Series 2450, no. 1 (2023): 012066. http://dx.doi.org/10.1088/1742-6596/2450/1/012066.

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Abstract For the problem of backlash in the semi-closed-loop linear feed servo system of CNC machine tools, which seriously affects the accuracy of machine tools, an acceleration segmentation backlash compensation strategy is proposed. In the reverse motion of the servo motor, the servo motor is controlled to compensate for the backlash error during a period of accelerated motion and a period of decelerated motion. Based on the established backlash transmission model, the parameters of the compensated motion process are calculated. In order to ensure accurate and quick compensation of the gap

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9

Wu, H., and F.-L. Yang. "Influence of a nearby hemisphere on the immersed on-wall collision dynamics of a sphere." Journal of Mechanics 40 (2024): 759–68. https://doi.org/10.1093/jom/ufae054.

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ABSTRACT Systematic experiments were conducted to elucidate how the dynamics of a fully immersed spherical pendulum in a normal approach to a wall may change with the presence of a third object–a hemisphere added to the wall at different vertical distances from the collision point. The studied collision regime ranges from non-bouncing to bouncing by changing the pendulum’s size, density, release angle, and liquid viscosity. In the non-bouncing regime, we analyzed the approach motion and found that the hemisphere decelerates the pendulum approach when it enters the area within one diameter of t

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10

Dai, Jin Jin, Xiang Min Li, and Zi Fen Li. "Target Identification Method for Single-Ship Air-Defense Based on Kinematics Characteristics." Advanced Materials Research 546-547 (July 2012): 559–64. http://dx.doi.org/10.4028/www.scientific.net/amr.546-547.559.

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In this paper, a target identification method is proposed based on kinematics characteristics for single-ship air-defense. After seriously analyzing the characteristics of modern air strike targets, extracting methods of the features of height, velocity, acceleration, detection distance, continuous radial motion etc. is given. Then, three-layer identification structure is established: layer 1 can identify tactical ballistic missile (TBM) and armed helicopter (AH) according to height, velocity; layer 2 can identify anti-radiation missile (ARM) and precision guided bomb (PGB) according to the fe

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11

Margolis, Donald. "Energy Regenerative Actuator for Motion Control With Application to Fluid Power Systems." Journal of Dynamic Systems, Measurement, and Control 127, no. 1 (2004): 33–40. http://dx.doi.org/10.1115/1.1870038.

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Motion control is principally involved with moving a load along some prescribed trajectory. Flight simulators and numerically controlled machine tools are examples where motion control is required. Actuators for motion control are typically electrohydraulic, electropneumatic, or electromechanical. An electric signal from a controller modulates high-power elements that control motion of a load in some prescribed manner. Since loads are continuously being accelerated and decelerated, actuators absorb energy as frequently as they output energy, but power is required from the supply regardless of

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12

Zhang, Guangfu, Ye Tian, Yangbao Deng, Dongchu Jiang, and Shuguang Deng. "Spin-Wave-Driven Skyrmion Motion in Magnetic Nanostrip." Journal of Nanotechnology 2018 (2018): 1–5. http://dx.doi.org/10.1155/2018/2602913.

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The photon-assisted magnetic recording utilizes the ultrafast laser to excite the spin wave in the magnetic nanostructures and accordingly switch its magnetization state. Here, by means of micromagnetic simulation, the motion of magnetic skyrmions, a topologically protected chiral magnet with few nanometer size, induced by the spin wave is studied. It is found that the magnetic skyrmion can move in the same direction of spin-wave propagation, which is first accelerated and then decelerated exponentially. The magnetic skyrmion motion originated from the robust coupling of the spin waves with th

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13

Lü, Xing, and Mingshu Peng. "Nonautonomous motion study on accelerated and decelerated solitons for the variable-coefficient Lenells-Fokas model." Chaos: An Interdisciplinary Journal of Nonlinear Science 23, no. 1 (2013): 013122. http://dx.doi.org/10.1063/1.4790827.

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14

Craighero, Laila, Valentina Ghirardi, Marco Lunghi, Fiorenza Panin, and Francesca Simion. "Two-day-old newborns learn to discriminate accelerated-decelerated biological kinematics from constant velocity motion." Cognition 195 (February 2020): 104126. http://dx.doi.org/10.1016/j.cognition.2019.104126.

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15

Putri, R. T., H. Z. Alhusni, and N. A. Lestari. "Design and Prototype Testing of the Video Tracker Analysis-Based Uniformly Varied Rectilinear Motion Tool for Uniformly Accelerated Rectilinear Motion and Uniformly Decelerated Rectilinear Motion Experiments." Journal of Physics: Conference Series 2623, no. 1 (2023): 012035. http://dx.doi.org/10.1088/1742-6596/2623/1/012035.

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Abstract Physics practicum activities have an important role in the learning process because they can provide convenience for students in proving theories. This research aims to develop a prototype uniformly varied rectilinear motion teaching aid based on a video analysis tracker in physics practicum. This study uses research and development with an ADDIE model. The research results show that when an object moves up, the object experiences slowed down, uniformly varied rectilinear motion. Meanwhile, when the object moves down, the object experiences uniformly varied rectilinear motion accelera

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Zhang, Lixin. "SIMPLIFICATION OF THE RIGID BODY DYNAMIC MODEL FOR A 6-UPS PARALLEL KINEMATIC MACHINE UNDER THE ACCELERATED MOTION AND THE DECELERATED MOTION." Chinese Journal of Mechanical Engineering 39, no. 11 (2003): 117. http://dx.doi.org/10.3901/jme.2003.11.117.

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17

Hsu, Li-Huan, Hung-Chi Kuo, and Robert G. Fovell. "On the Geographic Asymmetry of Typhoon Translation Speed across the Mountainous Island of Taiwan." Journal of the Atmospheric Sciences 70, no. 4 (2013): 1006–22. http://dx.doi.org/10.1175/jas-d-12-0173.1.

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Abstract This paper examines the effect of topographically phase-locked convection on the motion of typhoons across the island of Taiwan. Data for 84 typhoons that reached Taiwan’s eastern coast from 1960 to 2010 are analyzed, with motions compared to the long-term average overland translation speed. For 61 continuous-track typhoons among all cases, 77% of the slow-moving tropical cyclones (TCs) made landfall on the northern end of Taiwan’s eastern coast, while 60% of the fast storms had southeastern coastal landfalls. This geographic asymmetry with respect to typhoon translation speeds widene

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KIM, WONTAE, and EDWIN J. SON. "TWO NONCOMMUTATIVE PARAMETERS AND REGULAR COSMOLOGICAL PHASE TRANSITION IN THE SEMICLASSICAL DILATON COSMOLOGY." Modern Physics Letters A 23, no. 15 (2008): 1079–91. http://dx.doi.org/10.1142/s0217732308027047.

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We study cosmological phase transitions from modified equations of motion by introducing two noncommutative parameters in the Poisson brackets, which describes the initial- and future-singularity-free phase transition in the soluble semiclassical dilaton gravity with a nonvanishing cosmological constant. Accelerated expansion and decelerated expansion appear alternatively, where the model contains the second accelerated expansion. The final stage of the universe approaches the flat spacetime independent of the initial state of the curvature scalar as long as the product of the two noncommutati

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19

Bowin, C. O., W. Yi, R. D. Rosson, and S. T. Bolmer. "Phase change in subducted lithosphere, impulse, and quantizing Earth surface deformations." Solid Earth 6, no. 3 (2015): 1075–85. http://dx.doi.org/10.5194/se-6-1075-2015.

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Abstract. The new paradigm of plate tectonics began in 1960 with Harry H. Hess's 1960 realization that new ocean floor was being created today and is not everywhere of Precambrian age as previously thought. In the following decades an unprecedented coming together of bathymetric, topographic, magnetic, gravity, seismicity, seismic profiling data occurred, all supporting and building upon the concept of plate tectonics. Most investigators accepted the premise that there was no net torque amongst the plates. Bowin (2010) demonstrated that plates accelerated and decelerated at rates 10−8 times sm

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20

Holly, Jan E. "Baselines for three-dimensional perception of combined linear and angular self-motion with changing rotational axis." Journal of Vestibular Research 10, no. 4-5 (2000): 163–78. http://dx.doi.org/10.3233/ves-2000-104-501.

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The laws of physics explain many human misperceptions of whole-body passive self-motion. One classic misperception occurs in a rotating chair in the dark: If the chair is decelerated to a stop after a period of counterclockwise rotation, then a subject will typically perceive clockwise rotation. The laws of physics show that, indeed, a clockwise rotation would be perceived even by a perfect processor of angular acceleration information, assuming that the processor is initialized (prior to the deceleration) with a typical subject's initial perception – of no rotation in this case. The motion pe

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21

Zhu, Xiao Rong, Hui Ping Shen, and Wei Zhu. "Realization and Simulation of Motion Trajectory of a 2-DOF Planar Parallel Manipulator." Key Engineering Materials 467-469 (February 2011): 1351–56. http://dx.doi.org/10.4028/www.scientific.net/kem.467-469.1351.

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A kind of 2-DOF parallel manipulator driven by two sliders moving along two parallel guides is analyzed. Based on the explicit expression of inverse position, velocity and acceleration analyses, the mobile trajectory of this manipulator is investigated and simulated. In trajectory planning, the trajectory profiles are assigned to be accelerated and decelerated at the first and last few seconds, respectively, and keep at constant speed for the remainder of time, where the forth-order polynomial is fitted during acceleration and deceleration, and clothoid curve is applied around the corner of ax

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22

Noto, D., Y. Tasaka, T. Yanagisawa, and Y. Murai. "Horizontal diffusive motion of columnar vortices in rotating Rayleigh–Bénard convection." Journal of Fluid Mechanics 871 (May 21, 2019): 401–26. http://dx.doi.org/10.1017/jfm.2019.313.

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In laboratory experiments, horizontal translational motion of columnar vortices formed in rotating Rayleigh–Bénard convection was investigated. Two types of measurements, vertical velocity fields and horizontal temperature fields, were conducted with water as the test fluid. Using particle image velocimetry, the vertical velocity fields determined the parameter range at which the quasi-two-dimensional columnar vortices emerged. Locally, the duration characteristics of the columns, evaluated with their vertical coherence, indicate the minimum time scale of translational motion of the vortices i

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23

Zeng, Jiqing. "Classical physical mechanism of quantum production and its explanation for hydrogen atom structure and photoelectric effect." Physics Essays 34, no. 4 (2021): 529–37. http://dx.doi.org/10.4006/0836-1398-34.4.529.

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In this paper, the problems existing in the concepts of Planck's energy element and Einstein's light quantum are analyzed, and the alternate concept of quantum and a new concept of electron transition power were proposed. This paper clarifies the common misunderstanding in classical electromagnetics that the electron will radiate electromagnetic wave when it moves around the nucleus in a uniform circular motion and points out that the electron will radiate and absorb electromagnetic waves only when it moves around the nucleus in an accelerated or decelerated motion with a change of frequency a

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24

ARZHANNIKOV, A. V., V. T. ASTRELIN, V. S. KOIDAN, and S. L. SINITSKY. "Resonant principle for operation of energy recuperator for a magnetized electron beam: A numerical simulation." Laser and Particle Beams 20, no. 2 (2002): 359–64. http://dx.doi.org/10.1017/s026303460220227x.

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The problem of energy recuperator for a high current sheet electron beam used to drive a millimeter-waves generator is considered. There are two main obstacles to solving the problem. The first one is the presence of a magnetic field guiding beam electrons. The second obstacle is significant energy and angular spreads of the electrons in the waste beam. To overcome these obstacles, we suggest a novel scheme of a recuperator. The main idea of the proposed scheme is the use of a decelerating electrical field together with a guiding magnetic field that has longitudinal and spatial periodic transv

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25

Ziefle, Reiner Georg. "Einstein’s special relativity applies a not recognized physical mistake leading to an absurd interpretation of the Michelson‐Morley experiment and absurd physics." Physics Essays 36, no. 4 (2023): 422–33. http://dx.doi.org/10.4006/0836-1398-36.4.422.

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Special relativity (SR) needs different speeds of light in the horizontal arm of the Michelson‐Morley interferometer to “explain” a constant speed of light in all inertial frames. To obtain equal speeds from the two different speeds of light (c−v) = [(1 ‐ v/c) × c] and (c + v) = [(1 + v/c) × c], Einstein mathematically accelerates the speed of the photons in the direction of Earth’s motion around the Sun from [(1 ‐ v/c) × c] to [(1 − v2/c2) × c], and in the opposite direction, Einstein decelerates the speed of the photons from [(1 + v/c) × c] to [(1 − v2/c2) × c]. Besides the fact that light c

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Palleda, Thaviti Naidu, Santhosh Banoth, Yen-Ling Kuo, and Koji Kakehi. "Influences of Post-Heat Treatment on the Microstructure Evolution and Creep Properties of Ni-Based Superalloy IN718 Fabricated by Electron Beam Melting." Metals 12, no. 3 (2022): 446. http://dx.doi.org/10.3390/met12030446.

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In this study, the Ni-based superalloy IN718, fabricated using an electron beam melting process, was investigated in as-built and various heat-treated conditions. The relationships between the microstructure characteristics and creep properties were elucidated. Under testing conditions of 650 °C and 650 MPa, the direct-aged specimen exhibited the lowest steady-state creep rate, at 0.15 × 10−8 s−1. The superior creep resistance can be attributed to the higher volume fraction of γ’/γ”-strengthening precipitates within the grain and fine δ precipitates along the grain boundaries. Being coherent t

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Chen, Yan, Wen Zhuo Chen, Ken Chen, Jun Yi Shao, and Wei Ming Zhang. "Trajectory Generation for Inner V-Shaped Surface." Applied Mechanics and Materials 380-384 (August 2013): 681–85. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.681.

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V-shaped surface with two planes linked by an arc surface is widely used in structure design, such as inlet duct. According to its characteristic, the transverse painting method is adopted to plan painting trajectory for its inner surface. Along the curve of the cross-section, the plane area is painted under the uniform speed of spray pattern and the arc area is painted under the uniformly accelerated and decelerated motion. The maximum speed is calculated by the transfer efficiency of the plane area and arc area. Experimental tests and evaluation are carried out on an arc-transit duct with re

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28

Nobuta, Koji, and Tomoyuki Hanawa. "Instability of Accretion Flow with a Shock Wave." Publications of the Astronomical Society of Japan 46, no. 3 (1994): 257–65. https://doi.org/10.1093/pasj/46.3.257.

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Abstract The dynamical instability of accretion flow onto a black hole with a standing shock wave is investigated. When gas possessing angular momentum accretes onto a black hole, the flow can be associated with a standing shock wave. If the flow is decelerated at the pre-shock side of the front, it is unstable and the shock front leaves its equilibrium position. Assuming an isothermal accreting gas flow and a pseudo-Newtonian potential, we obtained the eigenvalues and eigenfunctions of unstable perturbations. The nonlinear evolution of the instability was also studied by a numerical simulatio

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Wang, Guanqun, Xiang Dong, Weidong Jia, et al. "Influence of Wind Speed on the Motion Characteristics of Peach Leaves (Prunus persica)." Agriculture 14, no. 12 (2024): 2307. https://doi.org/10.3390/agriculture14122307.

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Air-assisted sprayers are widely used in orchards due to their efficiency in enhancing droplet penetration and deposition. These sprayers disperse droplets through a high-velocity airflow, which agitates the leaves and aids in canopy penetration. This study involved controlled experiments to simulate leaf movement during field spraying, with a focus on the dynamics of peach tree leaves (Prunus persica) in varying wind fields. An experimental setup consisting of a wind-conveying system, a measurement system, and a fixed system was designed. The moving speeds of the wind field (0.75 m/s, 0.5 m/s

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30

Chang, Shou-Yi, Yi-Chung Huang, Shao-Yi Lin, Chia-Ling Lu, Chih Chen, and Ming Dao. "In Situ Study of Twin Boundary Stability in Nanotwinned Copper Pillars under Different Strain Rates." Nanomaterials 13, no. 1 (2023): 190. http://dx.doi.org/10.3390/nano13010190.

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The nanoscopic deformation of ⟨111⟩ nanotwinned copper nanopillars under strain rates between 10−5/s and 5 × 10−4/s was studied by using in situ transmission electron microscopy. The correlation among dislocation activity, twin boundary instability due to incoherent twin boundary migration and corresponding mechanical responses was investigated. Dislocations piled up in the nanotwinned copper, giving rise to significant hardening at relatively high strain rates of 3–5 × 10−4/s. Lower strain rates resulted in detwinning and reduced hardening, while corresponding deformation mechanisms are propo

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Bietenholz, M. F., N. Bartel, M. P. Rupen, et al. "Supernova 1993J in M81." Symposium - International Astronomical Union 205 (2001): 380–83. http://dx.doi.org/10.1017/s0074180900221529.

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Twenty-two consecutive VLBI images of supernova 1993J in the galaxy M81 taken over 7 years show, in unprecedented detail, the dynamic evolution of the expanding radio shell of an exploded star. High precision astrometry using phase-referencing shows that the supernova expands isotropically, and that its geometric center has a formal proper motion of 190±110 km s−1 w.r.t. the core of M81. Systematic changes in the images most likely reflect a pattern of inhomogeneities in the medium left over from the progenitor star, or possibly instabilities in the expanding shell. As the shockfront sweeps up

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Bondariev, A., I. Maksymiv, and S. Altunin. "SIMULATION OF RADIO RESPONSE MEASUREMENTS OF MORTAR SHELL." Information and communication technologies, electronic engineering 2, no. 2 (2022): 96–101. http://dx.doi.org/10.23939/ictee2022.02.096.

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The article is devoted to the problem of quickly measurement of the initial velocity of a mortar shell. In the article is carried out the simulation modeling of two optimal modifications of the radar response parameters meter from such a target. The structural diagrams of both modifications and the parameters of their analytical mathematical models are given and described. Numerical tests of both models are carried out for a test trajectory that simulates the uniformly decelerated motion of the shell. According to the simulation results, the values of the meters parameters, which ensure the mo

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ADAMS, BRETT, CHITRA DORAI, and SVETHA VENKATESH. "FINDING THE BEAT: AN ANALYSIS OF THE RHYTHMIC ELEMENTS OF MOTION PICTURES." International Journal of Image and Graphics 02, no. 02 (2002): 215–45. http://dx.doi.org/10.1142/s0219467802000573.

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This paper presents a new study on the application of the framework of Computational Media Aesthetics to the problem of automated understanding of film. Leveraging Film Grammar as the means to closing the "semantic gap" in media analysis, we examine film rhythm, a powerful narrative concept used to endow structure and form to the film compositionally and enhance its lyrical quality experientially. The novelty of this paper lies in the specification and investigation of the rhythmic elements that are present in two cinematic devices; namely motion and editing patterns, and their potential usefu

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Frey, Sándor, Judit Fogasy, Krisztina Perger, et al. "Revisiting a Core–Jet Laboratory at High Redshift: Analysis of the Radio Jet in the Quasar PKS 2215+020 at z = 3.572." Universe 10, no. 2 (2024): 97. http://dx.doi.org/10.3390/universe10020097.

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The prominent radio quasar PKS 2215+020 (J2217+0220) was once labelled as a new laboratory for core–jet physics at redshift z=3.572 because of its exceptionally extended jet structure traceable with very long baseline interferometric (VLBI) observations up to a ∼600 pc projected distance from the compact core and a hint of an arcsec-scale radio and an X-ray jet. While the presence of an X-ray jet could not be confirmed later, this active galactic nucleus is still unique at high redshift with its long VLBI jet. Here, we analyse archival multi-epoch VLBI imaging data at five frequency bands from

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Van Oss, R. F., G. H. J. Van Den Oord, and M. Kuperus. "Accretion Disk Flares in Energetic Radiation Fields." Symposium - International Astronomical Union 157 (1993): 217–18. http://dx.doi.org/10.1017/s0074180900174157.

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We consider the physics of magnetic flares in the energetic radiation field of an accretion disk corona (ADC). The X-ray emission from these flares is thought to be responsable for the observed hard powerlaw component in the X-ray spectra of galactic black hole candidates in their ‘high’ spectral state. During the flare event (inverse Compton) scattering of soft photons from the underlying disk into hard photons occurs on accelerated electrons in current sheets. The electrons are decelerated by the radiation drag force that results from the up-scattering. This friction-like effect of the inten

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36

Chen, Wei-Qin, Qing-Feng Guan, Chao-Fan Jiang, Fei-Fan Zhang, and Lei Wang. "Nonautonomous Motion Study on Accelerated and Decelerated Lump Waves for a (3 + 1)-Dimensional Generalized Shallow Water Wave Equation with Variable Coefficients." Complexity 2019 (November 16, 2019): 1–8. http://dx.doi.org/10.1155/2019/6287461.

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Under investigation in this paper is a (3 + 1)-dimensional variable-coefficient generalized shallow water wave equation. The exact lump solutions of this equation are presented by virtue of its bilinear form and symbolic computation. Compared with the solutions of the previous cases, these solutions contain two inhomogeneous coefficients, which can show some interesting nonautonomous characteristics. Three types of dispersion coefficients are considered, including the periodic, exponential, and linear modulations. The corresponding nonautonomous lump waves have different characteristics of tra

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Chen, Dongliang, Jindong Zhang, Xutao Weng, Yunjian Zhang, and Zhonghui Shi. "Analysis of Stiffness and Energy Consumption of Nonlinear Elastic Joint Legged Robot." Applied Bionics and Biomechanics 2020 (July 14, 2020): 1–10. http://dx.doi.org/10.1155/2020/8894399.

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In order to reduce the energy consumption of the legged robot in walking, this paper designs a kind of nonlinear elastic joint from the flexible variable-stiffness joint based on the mammal walking on the limb and optimizes the leg structure of the legged robot. The motor is rigidly connected to the articulated lever. When the lever is accelerated or decelerated, the elastic unit is introduced. The system can be considered as a special variable-rate elastic system. This paper will study it from theory and simulation experiments. Based on the dynamic analysis, a functional relationship between

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Hartmann, M., F. Kreuzpointner, R. Haefner, H. Michels, A. Schwirtz, and J. P. Haas. "Effects of Juvenile Idiopathic Arthritis on Kinematics and Kinetics of the Lower Extremities Call for Consequences in Physical Activities Recommendations." International Journal of Pediatrics 2010 (2010): 1–10. http://dx.doi.org/10.1155/2010/835984.

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Juvenile idiopathic arthritis (JIA) patients (n=36) with symmetrical polyarticular joint involvement of the lower extremities and healthy controls (n=20) were compared concerning differences in kinematic, kinetic, and spatio-temporal parameters with 3D gait analysis. The aims of this study were to quantify the differences in gait between JIA patients and healthy controls and to provide data for more detailed sport activities recommendations. JIA-patients showed reduced walking speed and step length, strongly anterior tilted pelvis, reduced maximum hip extension, reduced knee extension during s

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Walsh, J. R. "The Structure of the HH39 Region." Symposium - International Astronomical Union 115 (1987): 340–41. http://dx.doi.org/10.1017/s0074180900095759.

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HH39 is the group of Herbig-Haro (HH) objects associated with the young semi-stellar object R Monocerotis (R Mon) and the variable reflection nebula NGC 2261. An R CCD frame and a B prime focus plate of the region show a filament connecting NGC 2261 with HH39, confirming the association between R Mon and the HH objects. This filament is probably composed of emission material. The southern knot in HH39 has brightened over the last 20 years; its proper motion has been determined and is similar to that of the other knots. A total of 8 knots can be distinguished in HH39 surrounded by diffuse nebul

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Narksri, Patiphon, Eijiro Takeuchi, Yoshiki Ninomiya, and Kazuya Takeda. "Deadlock-Free Planner for Occluded Intersections Using Estimated Visibility of Hidden Vehicles." Electronics 10, no. 4 (2021): 411. http://dx.doi.org/10.3390/electronics10040411.

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A common approach used for planning blind intersection crossings is to assume that hypothetical vehicles are approaching the intersection at a constant speed from the occluded areas. Such an assumption can result in a deadlock problem, causing the ego vehicle to remain stopped at an intersection indefinitely due to insufficient visibility. To solve this problem and facilitate safe, deadlock-free intersection crossing, we propose a blind intersection planner that utilizes both the ego vehicle and the approaching vehicle’s visibility. The planner uses a particle filter and our proposed visibilit

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Akter, Shahina, M. Ferdows, Tasveer A. Bég, O. Anwar Bég, A. Kadir, and Shuyu Sun. "Spectral relaxation computation of electroconductive nanofluid convection flow from a moving surface with radiative flux and magnetic induction." Journal of Computational Design and Engineering 8, no. 4 (2021): 1158–71. http://dx.doi.org/10.1093/jcde/qwab038.

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Abstract A theoretical model is developed for steady magnetohydrodynamic viscous flow resulting from a moving semi-infinite flat plate in an electrically conducting nanofluid. Thermal radiation and magnetic induction effects are included in addition to thermal convective boundary conditions. Buongiorno’s two-component nanoscale model is deployed, which features Brownian motion and thermophoresis effects. The governing nonlinear boundary layer equations are converted to nonlinear ordinary differential equations by using suitable similarity transformations. The transformed system of differential

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Zhang, Q. M., S. H. Yang, T. Li, Y. J. Hou, and Y. Li. "Fast degradation of the circular flare ribbon on 2014 August 24." Astronomy & Astrophysics 636 (April 2020): L11. http://dx.doi.org/10.1051/0004-6361/202038072.

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Context. The separation and elongation motions of solar flare ribbons have extensively been investigated. The degradation and disappearance of ribbons have rarely been explored. Aims. We report our multiwavelength observations of a C5.5 circular-ribbon flare associated with two jets (jet1 and jet2) on 2014 August 24, focusing on the fast degradation of the outer circular ribbon (CR). Methods. The flare was observed in ultraviolet (UV) and extreme-ultraviolet (EUV) wavelengths by the Atmospheric Imaging Assembly (AIA) on board the Solar Dynamics Observatory spacecraft. Soft X-ray fluxes of the

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Lin, Chang, Wei-Ying Wong, Ming-Jer Kao, James Yang, Rajkumar V. Raikar, and Juan-Ming Yuan. "Hydrodynamic Features of an Undular Bore Traveling on a 1:20 Sloping Beach." Water 11, no. 8 (2019): 1556. http://dx.doi.org/10.3390/w11081556.

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The hydrodynamic characteristics, including local and convective accelerations as well as pressure gradient in the horizontal direction, of the external stream of an undular bore propagating on a 1:20 sloping beach are experimentally studied. A bore with the water depth ratio of 1.70 was generated downstream of a suddenly lifted gate. A high-speed particle image velocimetry was employed to measure the velocity fields during the run-up and run-down motions. The time series of free surface elevation and velocity field/profile of the generated bore, comprising a pure bore accompanied by a series

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VAN DER GELD, C. W. M., and J. G. M. KUERTEN. "Axisymmetric dynamics of a bubble near a plane wall." Journal of Fluid Mechanics 640 (November 2, 2009): 265–303. http://dx.doi.org/10.1017/s0022112009991340.

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Explicit expressions for the added mass tensor of a bubble in strongly nonlinear deformation and motion near a plane wall are presented. Time evolutions and interconnections of added mass components are derived analytically and analysed. Interface dynamics have been predicted with two methods, assuming that the flow is irrotational, that the fluid is perfect and with the neglect of gravity. The assumptions that gravity and viscosity are negligible are verified by investigating their effects and by quantifying their impact in some cases of strong deformation, and criteria are presented to speci

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Mkhatshwa, Musawenkosi Patson. "Overlapping Grid-Based Spectral Collocation Technique for Bioconvective Flow of MHD Williamson Nanofluid Over a Radiative Circular Cylindrical Body With Activation Energy." Computation 12, no. 4 (2024): 75. http://dx.doi.org/10.3390/computation12040075.

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The amalgamation of motile microbes in nanofluid (NF) is important in upsurging the thermal conductivity of various systems, including micro-fluid devices, chip-shaped micro-devices, and enzyme biosensors. The current scrutiny focuses on the bioconvective flow of magneto-Williamson NFs containing motile microbes through a horizontal circular cylinder placed in a porous medium with nonlinear mixed convection and thermal radiation, heat sink/source, variable fluid properties, activation energy with chemical and microbial reactions, and Brownian motion for both nanoparticles and microbes. The flo

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Gor, D., J. A. C. Humphrey, and R. Greif. "Ventilated Flow Between Corotating Disks With Large Obstructions in a Fixed Cylindrical Enclosure (Data Bank Contribution)." Journal of Fluids Engineering 116, no. 4 (1994): 828–34. http://dx.doi.org/10.1115/1.2911857.

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Time-resolved laser-Doppler velocimeter measurements of the circumferential velocity component were obtained for the flow between the center pair of four disks of common radius R2 corotating at angular velocity Ω in a fixed, cylindrical enclosure. Mean and rms profiles of this velocity component were obtained for two disk rotation speeds (300 and 3600 rpm), two relatively thick tapered obstructions (long and short) placed radially inward midway between each pair of disks, and three ventilation conditions (unventilated, blowing, and sucking) resulting from an imposed inter-disk radial throughfl

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Obulesu Mopuri, Raghunath Kodi, Charankumar Ganteda, Ramu Srikakulapu, and Giulio Lorenzini. "MHD Heat and Mass Transfer Steady Flow of a Convective Fluid Through a Porous Plate in The Presence of Diffusion Thermo and Aligned Magnetic Field." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 89, no. 1 (2021): 62–76. http://dx.doi.org/10.37934/arfmts.89.1.6276.

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In the presence of a diffusion thermal and coupled magnet field effect, this manuscript seeks continuous free convective motion by a viscous, incompressible fluid that conducts electrically past a sloping platform via a porous medium. The free flow speed may be compatible with the exponentially tiny disrupting law. Two-term harmonic and non-harmonic functions solve dimensional-less control equations analytically. Detailed graphs are used to determine the budgets for tempo, temperature, and concentration for various limit calculations. Also, the numbers of Nusselt and Sherwood are given and eva

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Dev, Sharma. "Estimating the Minimum Possible Deceleration of Cosmic Expansion Post-inflation." International Journal of Physics Research and Applications 7, no. 1 (2024): 080–85. http://dx.doi.org/10.29328/journal.ijpra.1001089.

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The inflationary epoch, occurring shortly after the Big Bang, initiated an extraordinarily rapid exponential expansion of the universe. Following this period, the rate of cosmic expansion decelerated for approximately 9.8 billion years, until observations indicated a transition to an accelerated expansion of space-time. This paper aims to estimate the minimum possible deceleration of cosmic expansion during the post-inflationary epoch, addressing an unresolved aspect of cosmological studies. The observable universe is modeled as a spherical region defined by the particle horizon in the FLRW me

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Michael Lewis, C. F., Steve M. Blasco, and Pierre L. Gareau. "Glacial Isostatic Adjustment of the Laurentian Great Lakes Basin: Using the Empirical Record of Strandline Deformation for Reconstruction of Early Holocene Paleo-Lakes and Discovery of a Hydrologically Closed Phase*." Géographie physique et Quaternaire 59, no. 2-3 (2007): 187–210. http://dx.doi.org/10.7202/014754ar.

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Abstract In the Great Lakes region, the vertical motion of crustal rebound since the last glaciation has decelerated with time, and is described by exponential decay constrained by observed warping of strandlines of former lakes. A composite isostatic response surface relative to an area southwest of Lake Michigan beyond the limit of the last glacial maximum was prepared for the complete Great Lakes watershed at 10.6 ka BP (12.6 cal ka BP). Uplift of sites computed using values from the response surface facilitated the transformation of a digital elevation model of the present Great Lakes basi

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Chernyshov, A. V., and S. A. Chernyshova. "A Method of Investigating the Phenomenon of Bifurcation Memory in the Dynamics of River Vessels." Nelineinaya Dinamika 18, no. 2 (2022): 171–81. http://dx.doi.org/10.20537/nd220202.

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The phenomenon of “bifurcation memory”, which can be detected during the steering of river vessels, is considered by researchers with the questions of equilibrium point’s bifurcations. It was noticed that in some dynamic systems during saddle-node bifurcation, areas are formed on the phase plane (so-called “phase spot”), passing through which the phase velocity of the representative point decreases. A decrease in phase velocity (e. g. during the steering of river vessel) can cause navigation accidents during shallow waters navigation. In order to improve sailing safety, it is necessary to inve

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