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Articles de revues sur le sujet « Wave Packet Dynamic »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Xiao, Tian Gui, Yao Wu, and Rong Hua Jin. "Analysis on the Characteristics of Scale Wave Energy Dynamic System during Extended Period of the Massive Drought in Southwestern Region." Applied Mechanics and Materials 164 (April 2012): 460–66. http://dx.doi.org/10.4028/www.scientific.net/amm.164.460.

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Through the wave-packet propagation diagnosis (WPD), the essay discusses and analyzes the characteristics of wave packet distribution and dynamic system of wave energy propagation during the extended period of the massive drought in southwestern region in the country by using the reanalysis grid data of the daily NCEP/NCAR geopotential height field and 10×10 horizontal resolution from September 2009 to April 2010. The results show that: the characteristics of dynamic system of wave energy propagation at the middle and high height fields can better reflect the stage features of this drought dur

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Markov, M. G., and A. Yu Yumatov. "THE EFFECT OF PROBE POSITION IN BOREHOLE ON WAVE PARAMETERS ESTIMATED FROM ACOUSTIC LOG DATA." Russian Geology and Geophysics 35, no. 2 (1994): 127–31. https://doi.org/10.2113/rgg.1994.35.2.127.

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By using an analytic solution to the problem of calculation of a pressure field created by a point source of elastic variations situated in a borehole, synthetic wave patterns (WP) of acoustic logging (AL) are obtained. Readings of three-element probes of acoustic logging are modelled with various positions of an emitter and receivers relative to the borehole axis. The calculated WP’s are processed by a software complex for processing wave AL data. Errors of the determination of kinematic and dynamic parameters (amplitudes) and waves are estimated as a function of probe location in the borehol

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Pizzo, Nick, and W. Kendall Melville. "Focusing deep-water surface gravity wave packets: wave breaking criterion in a simplified model." Journal of Fluid Mechanics 873 (June 24, 2019): 238–59. http://dx.doi.org/10.1017/jfm.2019.428.

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Geometric, kinematic and dynamic properties of focusing deep-water surface gravity wave packets are examined in a simplified model with the intent of deriving a wave breaking threshold parameter. The model is based on the spatial modified nonlinear Schrödinger equation of Dysthe (Proc. R. Soc. Lond. A, vol. 369 (1736), 1979, pp. 105–114). The evolution of initially narrow-banded and weakly nonlinear chirped Gaussian wave packets are examined, by means of a trial function and a variational procedure, yielding analytic solutions describing the approximate evolution of the packet width, amplitude

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ȘTEFĂNESCU, Eliade. "QUANTUM MECHANICS AS A THEORY BASED ON THE GENERAL THEORY OF RELATIVITY." Annals of the Academy of Romanian Scientists Series on Physics and Chemistry 7, no. 1 (2022): 7–52. http://dx.doi.org/10.56082/annalsarsciphyschem.2022.1.7.

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In this paper, we obtain the quantum dynamics in the framework of the general theory of relativity, where a quantum partide is described by a distribution of matter, with amplitude functions of the matter density, in the two conjugate spaces of the spațial coordinates and of the momentum, called wave functions. For a free partide, these wave functions are conjugate wave packets in the coordinate and momentum spaces, with time dependent phases proporțional to the relativistic lagrangian, as the wave velocities in the coordinate space are equal to the distribution velocity described by the wave

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Erofeev, V. I., A. N. Morozov, and I. S. Tsarev. "Quasi-Harmonic Bending Waves Evolution in a Beam Lying on the Generalized Nonlinear-Elastic Foundation and Possibility of their Transformation into a Sequence of Wave Packets." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (107) (April 2023): 83–97. http://dx.doi.org/10.18698/1812-3368-2023-2-83-97.

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The paper considers dynamic behavior of a track structure, which is a beam performing bending vibrations and lying on the elastic foundation. In this case, a generalized base model is selected that contains two independent bed coefficients: stiffness for tensile (compressive) and shear deformations. Such a model takes into account the soil distributive ability, i.e., its property to settle not only under the loaded area and the foundation, but also in its vicinity. In addition,to describe the foundation stiffness nonlinear properties, the model assumed dependence on the transverse midline beam

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Derakhti, Morteza, and James T. Kirby. "Breaking-onset, energy and momentum flux in unsteady focused wave packets." Journal of Fluid Mechanics 790 (February 9, 2016): 553–81. http://dx.doi.org/10.1017/jfm.2016.17.

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Breaking waves on the ocean surface transfer energy and momentum into currents and turbulence. What is less well understood, however, is the associated total loss of wave energy and momentum flux. Further, finding a robust and universal diagnostic parameter that determines the onset of breaking and its strength is still an open question. Derakhti & Kirby (J. Fluid Mech., vol. 761, 2014, pp. 464–506) have recently studied bubble entrainment and turbulence modulation by dispersed bubbles in isolated unsteady breaking waves using large-eddy simulation. In this paper, a new diagnostic paramete

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Fedyanin, A. E., N. E. Khokhlov, and A. M. Kalashnikova. "Rasprostranenie lazerno-indutsirovannogo paketa magnitostaticheskikh voln v psevdo-spinovom klapane v prisutstvii spinovoy nakachki." Журнал экспериментальной и теоретической физики 164, no. 4 (2023): 526–37. http://dx.doi.org/10.31857/s004445102310005x.

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Spin pumping and angular momentum transfer, i.e., the emission of a spin current by a precessing magnetization and the reverse process of absorption, play an important role in coherent magnetic dynamics processes in multilayered structures. For ferromagnetic layers separated by a nonmagnetic interlayer these effects give rise to a dynamic coupling between the layers that is dissipative in nature and affects the damping of coherent magnetization precession. We have used micromagnetic simulations to analyze the influence of such a dynamic coupling on the propagation of a laser-induced surface ma

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Warrick, Erika R., Ashley P. Fidler, Wei Cao, Etienne Bloch, Daniel M. Neumark та Stephen R. Leone. "Multiple pulse coherent dynamics and wave packet control of the N2 a′′ 1Σ+g dark state by attosecond four-wave mixing". Faraday Discussions 212 (2018): 157–74. http://dx.doi.org/10.1039/c8fd00074c.

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Frauenfelder, Hans, Robert D. Young, and Paul W. Fenimore. "The role of momentum transfer during incoherent neutron scattering is explained by the energy landscape model." Proceedings of the National Academy of Sciences 114, no. 20 (2017): 5130–35. http://dx.doi.org/10.1073/pnas.1612267114.

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We recently introduced a model of incoherent quasielastic neutron scattering (QENS) that treats the neutrons as wave packets of finite length and the protein as a random walker in the free energy landscape. We call the model ELM for “energy landscape model.” In ELM, the interaction of the wave packet with a proton in a protein provides the dynamic information. During the scattering event, the momentum Q(t) is transferred by the wave packet to the struck proton and its moiety, exerting the force F(t)=dQ(t)/dt. The resultant energy E⋆ is stored elastically and returned to the neutron as it exits

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White, Joshua, and Anantha Aiyyer. "African easterly waves in an idealized general circulation model: instability and wave packet diagnostics." Weather and Climate Dynamics 2, no. 2 (2021): 311–29. http://dx.doi.org/10.5194/wcd-2-311-2021.

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Abstract. We examine the group dynamic of African easterly waves (AEWs) generated in a realistic, spatially non-homogeneous African easterly jet (AEJ) using an idealized general circulation model. Our objective is to investigate whether the limited zonal extent of the AEJ is an impediment to AEW development. We construct a series of basic states using global reanalysis fields and initialize waves via transient heating over West Africa. The dominant response is a localized, near-stationary wave packet that disperses upstream and downstream. The inclusion of a crude representation of boundary la

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Ali, Mohamed G. S., Nour Z. Elsayed, and Ebtsam A. Eid. "A Simulation for Detecting Nonlinear Echoes from Microbubbles Packets." Archives of Acoustics 40, no. 2 (2015): 151–57. http://dx.doi.org/10.1515/aoa-2015-0017.

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Abstract This work presents a simulation of the response of packets of microbubbles in an ultrasonic pulse-echo scan line. Rayleigh-Plesset equation has been used to predict the echo from numerically obtained radial dynamics of microbubbles. Varying the number of scattering microbubbles on the pulse wave form has been discussed. To improve microbubble-specific imaging at high frequencies, the subharmonic and second harmonic signals from individual microbubbles as well as microbubbles packets were simulated as a function of size and pressure. Two different modes of harmonic generation have been

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Krysztofik, Adam, Nikolai Kuznetsov, Huajun Qin, Lukáš Flajšman, Emerson Coy, and Sebastiaan van Dijken. "Tuning of Magnetic Damping in Y3Fe5O12/Metal Bilayers for Spin-Wave Conduit Termination." Materials 15, no. 8 (2022): 2814. http://dx.doi.org/10.3390/ma15082814.

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In this work, we investigate the structural and dynamic magnetic properties of yttrium iron garnet (YIG) films grown onto gadolinium gallium garnet (GGG) substrates with thin platinum, iridium, and gold spacer layers. Separation of the YIG film from the GGG substrate by a metal film strongly affects the crystalline structure of YIG and its magnetic damping. Despite the presence of structural defects, however, the YIG films exhibit a clear ferromagnetic resonance response. The ability to tune the magnetic damping without substantial changes to magnetization offers attractive prospects for the d

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Mizuse, Kenta, Kenta Kitano, Hirokazu Hasegawa, and Yasuhiro Ohshima. "Quantum unidirectional rotation directly imaged with molecules." Science Advances 1, no. 6 (2015): e1400185. http://dx.doi.org/10.1126/sciadv.1400185.

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A gas-phase molecular ensemble coherently excited to have an oriented rotational angular momentum has recently emerged as an appropriate microscopic system to illustrate quantum mechanical behavior directly linked to classical rotational motion, which has a definite direction. To realize an intuitive visualization of such a unidirectional molecular rotation, we report high-resolution direct imaging of direction-controlled rotational wave packets in nitrogen molecules. The rotational direction was regulated by a pair of time-delayed, polarization-skewed laser pulses, introducing the dynamic chi

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Bunjac, A., D. B. Popović, and N. S. Simonović. "Resonant dynamic Stark shift as a tool in strong-field quantum control: calculation and application for selective multiphoton ionization of sodium." Physical Chemistry Chemical Physics 19, no. 30 (2017): 19829–36. http://dx.doi.org/10.1039/c7cp02146a.

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A method for determining the resonant dynamic Stark shift (RDSS), based on wave-packet calculations of the populations of quantum states, is presented. The RDSS data are used to analyze selective multiphoton ionization of sodium.

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Hu, Chen, and Ke Ding. "Thin Plate Damage Analysis Based on Transient Displacement Response." Academic Journal of Science and Technology 15, no. 1 (2025): 249–58. https://doi.org/10.54097/v2k3e487.

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This study systematically simulates and analyzes the dynamic response of a thin plate structure under different damage conditions based on a transient model, aiming to evaluate the performance of Wave Atom transform, wavelet packet transform, and Curvelet transform in damage detection. By applying random initial displacement excitations to the thin plate structure and using optimized load step settings, the impact of different damage severities, damage ranges, boundary damage, and damage spacing on the dynamic response of the structure is analyzed. The results show that both Wave Atom and Curv

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Talbot, Justin J., Martin Head-Gordon, William H. Miller, and Stephen J. Cotton. "Dynamic signatures of electronically nonadiabatic coupling in sodium hydride: a rigorous test for the symmetric quasi-classical model applied to realistic, ab initio electronic states in the adiabatic representation." Physical Chemistry Chemical Physics 24, no. 8 (2022): 4820–31. http://dx.doi.org/10.1039/d1cp04090a.

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Zhu, Dong Bi, and Dan Dan Zhu. "Performance Analysis of a Multi-Channel MAC with Dynamic CCH Interval in WAVE System." Advanced Materials Research 765-767 (September 2013): 2621–24. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.2621.

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To improve the throughput performance of the Wireless Access in Vehicular Environment (WAVE) system, we propose a multi-channel MAC protocol that is able to adaptively adjust the intervals of Control Channel (CCH) and Service Channel (SCH) according to the probability distribution of the reservation time for service packet in CCH Interval. Numerical results show that our protocol can significantly improve the performance of WAVE system.

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Pollard, W. Thomas, Soo‐Y Lee, and Richard A. Mathies. "Wave packet theory of dynamic absorption spectra in femtosecond pump–probe experiments." Journal of Chemical Physics 92, no. 7 (1990): 4012–29. http://dx.doi.org/10.1063/1.457815.

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Cádiz, Rodrigo F., and Javier Ramos. "Sound Synthesis of a Gaussian Quantum Particle in an Infinite Square Well." Computer Music Journal 38, no. 4 (2014): 53–67. http://dx.doi.org/10.1162/comj_a_00268.

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This article describes a synthesis technique based on the sonification of the dynamic behavior of a quantum particle enclosed in an infinite square well. More specifically, we sonify the momentum distribution of a one-dimensional Gaussian bouncing wave packet model. We have chosen this particular case because of its relative simplicity and interesting dynamic behavior, which makes it suitable for a novel sonification mapping that can be applied to standard synthesis techniques, resulting in the generation of appealing sounds. In addition, this sonification might provide useful insight into the

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Chuan, Wu, Ding Huafeng, and Han Lei. "A dynamic ocean wave simulator based on six-degrees of freedom parallel platform." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 232, no. 20 (2017): 3722–32. http://dx.doi.org/10.1177/0954406217739647.

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The development of marine equipment is an international trend. It is also a strategic choice for coastal countries, as the basis to construct a strong marine power. For this purpose, the Chinese government has strengthened the support for marine equipment research and development in recent years. For most researchers, however, they cannot test their marine equipment at an actual ocean site due to limited fund as well as because the devices are not easy to move. Hence, devices for simulating ocean waves are emerging on this basis. But these existing devices are not able to completely recreate t

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Liu, Yu-Jie, Jing-Jing Wang, Li Zheng, Ying Shi, and Li Xiong. "Dynamic behavior of the quantum correlations of two cavity fields in the double Jaynes–Cummings model." Laser Physics Letters 19, no. 4 (2022): 045204. http://dx.doi.org/10.1088/1612-202x/ac5521.

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Abstract The influence of the atom’s spatial degrees of freedom and the purity of the initial state on the dynamics of Bell non-locality, entanglement, geometric measure of quantum discord (GMQD) and quantum discord in a double Jaynes–Cummings model are investigated. We study the above four quantum correlations for an initial Werner-like state between the electronic states of the two atoms and between the two cavities respectively and find that all these quantum correlations are sensitive to the wave packet width and the purity of the initial state. For Bell non-locality, we find the phenomeno

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Sun, Zhigang, Zhongqi Jin, J. Lu, Dong H. Zhang, and Soo-Y. Lee. "Wave packet theory of dynamic stimulated Raman spectra in femtosecond pump-probe spectroscopy." Journal of Chemical Physics 126, no. 17 (2007): 174104. http://dx.doi.org/10.1063/1.2715593.

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Shahverdyan, A. V., K. G. Trouni, and V. R. Kocharyan. "Dynamic diffraction of thermal neutrons in crystals with continuous deformation field." Journal of Instrumentation 19, no. 06 (2024): C06014. http://dx.doi.org/10.1088/1748-0221/19/06/c06014.

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Abstract The purpose of the work is to consider the basics of the formation of a diffraction wave field of thermal neutrons in the case of Laue transmission geometry of a limited beam of neutrons in the crystal, taking into account the peculiarities of the interaction of thermal neutrons with a continuously and slowly changing deformation field of the crystal net. The conditions of both diffraction blurring and diffraction contraction (focusing) up to the practical restoration of the original shape of the packet will be studied. An integral form for determining the quasi-amplitudes of diffract

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Huang, Zhongkai, Alejandro D. Somoza, Cheng Peng, et al. "Polaron dynamics of Bloch–Zener oscillations in an extended Holstein model." New Journal of Physics 23, no. 12 (2021): 123020. http://dx.doi.org/10.1088/1367-2630/ac3ac7.

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Abstract Recent developments in qubit engineering make circuit quantum electrodynamics devices promising candidates for the study of Bloch oscillations (BOs) and Landau–Zener (LZ) transitions. In this work, a hybrid circuit chain with alternating site energies under external electric fields is employed to study Bloch–Zener oscillations (BZOs), i.e. coherent superpositions of BOs and LZ transitions. We couple each of the tunable qubits in the chain to dispersionless optical phonons and build an extended Holstein polaron model with the purpose of investigating vibronic effects in the BZOs. We em

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Jordan, Vladimir I., and Igor A. Shmakov. "Computer molecular-dynamic simulation of shs microkinetics in the atomic structure with a checkerboard-like arrangement of nanoscale blocks of Ni and Al atoms." Yugra State University Bulletin 16, no. 2 (2020): 71–77. http://dx.doi.org/10.17816/byusu2020271-77.

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The article presents the results of computer simulation of the propagation of the combustion wave of "self-propagating high-temperature synthesis (SHS)" process in an atomic layered structure. In each layer of the structure, nanosized blocks of two types alternate: a block of the first type is composed as a packet of unit cells of Ni atoms, and a block of the second type is composed of a packet of elementary cells of Al atoms. In each pair of layers adjacent to each other, sequences of alternating blocks of two types are shifted relative to each other by one block, so the full layered structur

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Tanış, Emine, Engin Yılmaz та Ezman Karabulut. "The functional states of angular quantum numbers and Ne + H2+(ν= 0,j= 2) → NeH++ H reaction mechanism". Canadian Journal of Physics 96, № 12 (2018): 1395–403. http://dx.doi.org/10.1139/cjp-2018-0162.

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The behaviors of Legendre polynomials representing angular movements are independent of the type of reaction and can be studied in detail paying attention to the changes on effective and centrifugal potentials. For the title reaction, dynamic calculations taking into account the effects of potential energy surfaces have been investigated using the real wave packet method on the most realistic potential energy surface (LZHH) recently obtained. The total electrical dipoles and energies were also calculated in the corresponding quantum states of the molecular system.

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Baby, Ajin, and Manish Shrikhande. "Wavelet Packet Characterization of Scenario Earthquake Ground Motions." Journal of Earthquake and Tsunami 11, no. 03 (2017): 1750006. http://dx.doi.org/10.1142/s1793431117500063.

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With increased emphasis on performance-based seismic design, the need for appropriate ground motion time histories for use in nonlinear dynamic analyses is felt accutely. However, it is generally not possible to get a suitable recorded time history consistent with the estimated hazard at a specific site. The ground motion prediction models are therefore derived/developed from a statistical analysis of recorded ground motion for a variety of source and site conditions to address this need. Most often, the ground motion prediction models are developed to model the response spectrum amplitudes at

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Ji, Hongxin, Zijian Tang, Chao Zheng, Xinghua Liu та Liqing Liu. "Insulator Partial Discharge Localization Based on Improved Wavelet Packet Threshold Denoising and Gxx−β Generalized Cross-Correlation Algorithm". Sensors 25, № 13 (2025): 4089. https://doi.org/10.3390/s25134089.

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Partial discharge (PD) in insulators will not only lead to the gradual degradation of insulation performance but even cause power system failure in serious cases. Because there is strong noise interference in the field, it is difficult to accurately locate the position of the PD source. Therefore, this paper proposes a three-dimensional spatial localization method of the PD source with a four-element ultra-high-frequency (UHF) array based on improved wavelet packet dynamic threshold denoising and the Gxx−β generalized cross-correlation algorithm. Firstly, considering the field noise interferen

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Long, Jinyou, Yuzhu Liu, Chaochao Qin, Song Zhang, and Bing Zhang. "Real-time visualization of the dynamic evolution of CS_2 4d and 6s Rydberg wave packet components." Optics Express 19, no. 5 (2011): 4542. http://dx.doi.org/10.1364/oe.19.004542.

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Zhang, Wenqi, Lin Wang, Dehai Luo, et al. "Impacts of Background Conditions on the Evolutionary Disparities between Greenland and Euro-Atlantic Blocking." Journal of the Atmospheric Sciences 82, no. 3 (2025): 501–17. https://doi.org/10.1175/jas-d-24-0016.1.

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Abstract In this paper, we investigate the contrasting evolutionary behaviors and weather impacts of Greenland blocking and Euro-Atlantic blocking. The comprehensive analysis reveals that Greenland blocking is characterized by substantial amplitude, a prolonged lifespan, and notable westward movement, accompanied by significant warming over western Greenland and cooling over eastern North America and northern Europe. In contrast, Euro-Atlantic blocking remains quasi stationary, has a shorter duration, and features a smaller amplitude, resulting in only mild cooling over southern Europe. We elu

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Kharchenko, Diana Sergeevna. "The shape of wave-packets in a three-layer hydrodynamic system." V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics, no. 94 (November 29, 2021): 77–90. http://dx.doi.org/10.26565/2221-5646-2021-94-05.

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The article is devoted to the problem of wave-packet propagation in a three - layer hydrodynamic system "layer with a hard bottom - layer - layer with a cover stratified by density. The current research on selected topics is reviewed. The mathematical formulation of the problem is given in dimensionless form and contains the equations of fluid motion, kinematic and dynamic conditions on the contact surfaces, as well as the boundary conditions on the lid and on the bottom. Using the method of multiscale developments, the first three approximations of the studied problem are obtained, of which t

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Xu, Hongtai, and Zijiang Yang. "State-to-State Quantum Dynamics Study of Intramolecular Isotope Effects on Be(1S) + HD (v0 = 2, j0 = 0) → BeH/BeD + H/D Reaction." Molecules 29, no. 6 (2024): 1263. http://dx.doi.org/10.3390/molecules29061263.

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The dynamic mechanisms and intramolecular isotope effects of the Be(1S) + HD (v0 = 2, j0 = 0) → BeH/BeD + H/D reaction are studied at the state-to-state level using the time-dependent wave packet method on a high-quality potential energy surface. This reaction can proceed along the indirect pathway that features a barrier and a deep well or the smooth direct pathway. The reaction probabilities, total and state-resolved integral cross sections, and differential cross sections are analyzed in detail. The calculated dynamics results show that both of the products are mainly formed by the dissocia

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Chen, Huan Guo, Yun Ju Yan, and Jie Sheng Jiang. "Vibration-Based Damage Detection of Composite Wingbox Structures Using Improved Hilbert-Huang Transform." Key Engineering Materials 324-325 (November 2006): 539–42. http://dx.doi.org/10.4028/www.scientific.net/kem.324-325.539.

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A vibration-based approach to detect crack damage in a cantilever composite wingbox is studied using the improved Hilbert-Huang Transform (HHT). The improved HHT is composed of HHT with Wavelet Packet Transform (WPT) and a simple but effective method for intrinsic mode function (IMF) selection. For different damage status, in order to obtain structural dynamic responses, which imply plentiful damage information, the composite wing boxes were excited by a contrived square wave signal. Then, the dynamic responses of intact wingbox and damaged wingbox are disposed using improved HHT. Finally, a f

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Wang, Haiyan, Ji Ma, Gongda Wang, Han Gao, Guangyong Cui, and Xiaoshen Li. "Research on AE Source Location of Linear and Plane Rock Mass." Shock and Vibration 2020 (September 8, 2020): 1–18. http://dx.doi.org/10.1155/2020/8846582.

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The occurrence of rockburst dynamic disaster is a process from the microdamage to macroinstability of coal and rock mass, which is accompanied by the acoustic emission (AE) phenomenon. The application of AE technology can reliably help to judge and predict the damage evolution of coal and rock mass, as the most basic problem in the study of AE is the location of the AE source. In this work, the AE source localization experiments of rod-shaped rocks and plate-shaped rocks were carried out. The influence of calibration wave velocity of linear and plane positioning on the location of the AE sourc

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Zhao, Mingjie, Guoyin Wu, and Kui Wang. "Comparative Analysis of Dynamic Response of Damaged Wharf Frame Structure under the Combined Action of Ship Collision Load and Other Static Loads." Buildings 12, no. 8 (2022): 1131. http://dx.doi.org/10.3390/buildings12081131.

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In the long-term service, the wharf structure can be damaged by ship impact, wave load, and even earthquake, which will affect the safe production and smooth operation of the port. Based on the theory of structural dynamic response analysis and wavelet packet analysis principle, this paper established the damage identification index of the wharf frame structure. Combining with the finite element method and the dynamic response theory of the wharf frame structure, it set up a finite element analysis model of the dynamic response of the wharf frame structure under the action of multiple loads, w

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Tonoro, Aletheia Anggelia, Hartanto K. Wardana, and Saptadi Nugroho. "Simulasi dan Pengkajian Performa Vehicular Ad Hoc Network." Techné : Jurnal Ilmiah Elektroteknika 14, no. 01 (2015): 27–34. http://dx.doi.org/10.31358/techne.v14i01.121.

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Meningkatnya, tingkat kecelakaan dan kemacetan di jalan raya, dan berkembangnya teknologi informasi dengan menggunakan wireless, menghadirkan teknologi Wireless Access for Vehicular Environment (WAVE) sebagai standart komunikasi kendaraan. Salah satu, perkembangan WAVE adalah Vehicular ad hoc networks (VANET). Teknologi VANET memungkinkan sebuah perangkat komunikasi dapat berkomunikasi secara langsung dengan perangkat lain dalam posisi bergerak misalnya mobil. Meskipun VANET dapat membantu menyelesaikan permasalahan lalu lintas seperti kecelakaan, dan kemacetan, tapi untuk membangun infrastruk

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Velichko, S., A. Matveev, D. Bychkov, V. Ivanov, V. Tsymbal, and O. Gavrilenko. "Radar monitoring of long surface waves in the pacific ocean." RADIOFIZIKA I ELEKTRONIKA 26, no. 1 (2021): 3–11. http://dx.doi.org/10.15407/rej2021.01.003.

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Subject and Purpose. The paper addresses interaction processes going in the ocean–atmosphere system and is concerned with their research by the method of radar remote sensing. Specifically, the matter of concern is the detection and parameter estimation of long waves, including nonlinear ones, on the ocean surface. Methods and Methodology. In August 1988, a series of successive radar surveys of long surface wave manifestations on the Pacific Ocean surface was carried out in the 3 cm wave range by means of an airborne X-band radar system “Analog”. The analysis of the results includes estimation

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Park, Young Choon, Heesun An, Yoon Sup Lee, and Kyung Koo Baeck. "Dynamic Symmetry Breaking Hidden in Fano Resonance of a Molecule: S1 State of Diazirine Using Quantum Wave Packet Propagation." Journal of Physical Chemistry A 120, no. 6 (2016): 932–38. http://dx.doi.org/10.1021/acs.jpca.5b11052.

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Wolf, Gabriel, and Volkmar Wirth. "Diagnosing the Horizontal Propagation of Rossby Wave Packets along the Midlatitude Waveguide." Monthly Weather Review 145, no. 8 (2017): 3247–64. http://dx.doi.org/10.1175/mwr-d-16-0355.1.

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It has been suggested that upper-tropospheric Rossby wave packets propagating along the midlatitude waveguide may play a role for triggering severe weather. This motivates the search for robust methods to detect and track Rossby wave packets and to diagnose their properties. In the framework of several observed cases, this paper compares different methods that have been proposed for these tasks, with an emphasis on horizontal propagation and on a particular formulation of a wave activity flux previously suggested by Takaya and Nakamura. The utility of this flux is compromised by the semigeostr

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Karjanto, Natanael. "Modeling Wave Packet Dynamics and Exploring Applications: A Comprehensive Guide to the Nonlinear Schrödinger Equation." Mathematics 12, no. 5 (2024): 744. http://dx.doi.org/10.3390/math12050744.

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The nonlinear Schrödinger (NLS) equation stands as a cornerstone model for exploring the intricate behavior of weakly nonlinear, quasi-monochromatic wave packets in dispersive media. Its reach extends across diverse physical domains, from surface gravity waves to the captivating realm of Bose–Einstein condensates. This article delves into the dual facets of the NLS equation: its capacity for modeling wave packet dynamics and its remarkable breadth of applications. We illuminate the derivation of the NLS equation through both heuristic and multiple-scale approaches, underscoring how distinct in

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Kurman, Yaniv, Raphael Dahan, Hanan Herzig Sheinfux, et al. "Spatiotemporal imaging of 2D polariton wave packet dynamics using free electrons." Science 372, no. 6547 (2021): 1181–86. http://dx.doi.org/10.1126/science.abg9015.

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Coherent optical excitations in two-dimensional (2D) materials, 2D polaritons, can generate a plethora of optical phenomena that arise from the extraordinary dispersion relations that do not exist in regular materials. Probing of the dynamical phenomena of 2D polaritons requires simultaneous spatial and temporal imaging capabilities and could reveal unknown coherent optical phenomena in 2D materials. Here, we present a spatiotemporal measurement of 2D wave packet dynamics, from its formation to its decay, using an ultrafast transmission electron microscope driven by femtosecond midinfrared pul

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Dosser, Hayley V., and Bruce R. Sutherland. "Anelastic Internal Wave Packet Evolution and Stability." Journal of the Atmospheric Sciences 68, no. 12 (2011): 2844–59. http://dx.doi.org/10.1175/jas-d-11-097.1.

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Abstract As upward-propagating anelastic internal gravity wave packets grow in amplitude, nonlinear effects develop as a result of interactions with the horizontal mean flow that they induce. This qualitatively alters the structure of the wave packet. The weakly nonlinear dynamics are well captured by the nonlinear Schrödinger equation, which is derived here for anelastic waves. In particular, this predicts that strongly nonhydrostatic waves are modulationally unstable and so the wave packet narrows and grows more rapidly in amplitude than the exponential anelastic growth rate. More hydrostati

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Mahmood, Tahera. "Data Dissemination Scheme for VANET using Genetic algorithm and Particle Swarm Optimization." International Journal of Recent Technology and Engineering 10, no. 1 (2021): 322–28. http://dx.doi.org/10.35940/ijrte.a5970.0510121.

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A vehicular ad hoc network (VANET) consist of moving vehicles connected via wireless technology e.g., Wireless Access in Vehicular Environment (WAVE) for the aim of exchanging information. Therefore data dissemination in VANET has become issue of debate for researcher. In VANET broadcasting play an important role. The aim of VANET is to ensure passenger safety through emergency message. With multiple objectives broadcast storm is assumed to be an NP-Hard problem. In this paper we propose DDV algorithm to solve broadcast storm problem. Fitness function has used to optimize the objective of prop

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Tahera, Mahmood, and Tulika. "Data Dissemination Scheme for VANET using Genetic algorithm and Particle Swarm Optimization." International Journal of Recent Technology and Engineering (IJRTE) 10, no. 1 (2021): 322–28. https://doi.org/10.35940/ijrte.A5970.0510121.

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A vehicular ad hoc network (VANET) consist of moving vehicles connected via wireless technology e.g., Wireless Access in Vehicular Environment (WAVE) for the aim of exchanging information. Therefore data dissemination in VANET has become issue of debate for researcher. In VANET broadcasting play an important role. The aim of VANET is to ensure passenger safety through emergency message. With multiple objectives broadcast storm is assumed to be an NP-Hard problem. In this paper we propose DDV algorithm to solve broadcast storm problem. Fitness function has used to optimize the objective of prop

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Barcellona, Marco, Maurizio Simos, Marilena Greco, and O. M. Faltinsen. "An Experimental Investigation on Bow Water Shipping." Journal of Ship Research 47, no. 04 (2003): 327–46. http://dx.doi.org/10.5957/jsr.2003.47.4.327.

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The water on deck caused on a restrained ship model without forward speed in head waves is studied experimentally by using a transient test technique. A single water-shipping event is induced by the wave packet, and the severity of the interaction is controlled by the wave-packet steepness. Three different bow geometries are considered. Two of them are analytical hull forms, and the last is the ESSO-Osaka tanker. The models are equipped with a transparent-material deck to study the flow-field evolution by image analysis. A vertical wall is placed at a certain distance from the forward perpendi

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Wolf, Gabriel, and Volkmar Wirth. "Implications of the Semigeostrophic Nature of Rossby Waves for Rossby Wave Packet Detection." Monthly Weather Review 143, no. 1 (2015): 26–38. http://dx.doi.org/10.1175/mwr-d-14-00120.1.

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Abstract Upper-tropospheric Rossby wave packets have received increased attention recently. In most previous studies wave packets have been detected by computing the envelope of the meridional wind field using either complex demodulation or a Hilbert transform. The latter requires fewer choices to be made and appears, therefore, preferable. However, the Hilbert transform is fraught with a significant problem, namely, a tendency that fragments a single wave packet into several parts. The problem arises because Rossby wave packets show substantial deviations from the almost-plane wave paradigm,

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Pizzo, N. E., and W. Kendall Melville. "Wave modulation: the geometry, kinematics, and dynamics of surface-wave packets." Journal of Fluid Mechanics 803 (August 19, 2016): 292–312. http://dx.doi.org/10.1017/jfm.2016.473.

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We examine the geometry, kinematics, and dynamics of weakly nonlinear narrow-banded deep-water wave packets governed by the modified nonlinear Schrödinger equation (Dysthe, Proc. R. Soc. Lond. A., vol. 369, 1979, pp. 105–114; MNLSE). A new derivation of the spatial MNLSE, by a direct application of Whitham’s method, elucidates its variational structure. Using this formalism, we derive a set of conserved quantities and moment evolution equations. Next, by examining the MNLSE in the limit of vanishing linear dispersion, analytic solutions can be found. These solutions then serve as trial functio

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Mao Yi-Yi and Dai Han-Ning. "Aubry-André-Harper momentum-state chain in curved spacetime." Acta Physica Sinica 74, no. 2 (2025): 0. https://doi.org/10.7498/aps.74.20241592.

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Anderson localization is a profound phenomenon in condensed matter physics, representing a fundamental transition of eigenstates induced by disorder. The one-dimensional Aubry-André-Harper (AAH) model, an iconic quasiperiodic lattice model, is one of the simplest models that demonstrate the Anderson localization transition. Recently, with the growing interest in quantum lattice models in curved spacetime (CST), the AAH model in CST has been proposed as a way to explore the interplay between Anderson localization and CST physics. While a few CST lattice models have been realized in optical wave

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Brunskill, Henry, Andy Hunter, Lu Zhou, Rob Dwyer Joyce, and Roger Lewis. "An evaluation of ultrasonic arrays for the static and dynamic measurement of wheel–rail contact pressure and area." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 10 (2020): 1580–93. http://dx.doi.org/10.1177/1350650120919889.

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The interfacial contact conditions between a railway vehicle wheel and the rail are paramount to the lifespan, safety and smooth operation of any rail network. The wheel–rail interface contact pressure and area conditions have been estimated, calculated and simulated by industry and academia for many years, but a method of accurately measuring dynamic contact conditions has yet to be realised. Methods using pressure-sensitive films and controlled air flow have been employed, but both are limited. Ultrasonic reflectometry is the term given to active ultrasonics in which an ultrasonic transducer

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Cheng, Junxia, Bo Tian, Siyu Li, Jia Wang, and Shenjiang Wu. "Investigating the Selective Control of Photoassociation of Yb2." International Journal of Optics 2021 (September 4, 2021): 1–9. http://dx.doi.org/10.1155/2021/6859330.

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The selective control of photoassociation of Yb2 is investigated in theory. Based on ab initio to rationalize Franck–Condon filtering, the optimal target states of photoassociation have been obtained. The corresponding vibrational transitions from X1Σ+g to the excited state (A1Σu+, B1Πu, C1Σu+, and D1Πu) are v ′ = 23, 50, 55, and 0, respectively. By using quantum wave packet dynamic methods, we calculated the yields with time evaluation for the selected target states. The projections of time-dependent wave functions of initial states on the target vibrational eigenstates reflected the syntheti

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