Results 51 to 60 of about 1,923 (164)

Stochastic Quantum Mechanics in Curved Spaces: Application to Schwarzschild Black Holes

Astronomische Nachrichten, Volume 346, Issue 3-4, March-May 2025.
ABSTRACT In this work, we start from the hypothesis that the universe lives in a Gravitational Wave Background (GWB). From this hypothesis, it follows that space–time is not locally flat because we have to take into account the fluctuations of the GWB in space–time. This implies that sufficiently small particles will feel these oscillations, preventing
Juan S. Jerez‐Rodriguez, Tonatiuh Matos   +1 more
wiley   +1 more source

Computation of Viscoelastic Shear Shock Waves Using Finite Volume Schemes With Artificial Compressibility

International Journal for Numerical Methods in Biomedical Engineering, Volume 41, Issue 2, February 2025.
The artificial compressibility method is proposed to analyse the nonlinear dynamic response of soft viscoelastic solids such as brain tissue. Based on Lagrangian finite volume schemes, the formation of shear shock waves and wave focusing are reproduced numerically. The methodology could be applied to head trauma simulations.
Harold Berjamin
wiley   +1 more source

Controlled Lagrangians and Stabilization of the Discrete Cart-Pendulum System [PDF]

, 2006
Matching techniques are developed for discrete mechanical systems with symmetry. We describe new phenomena that arise in the controlled Lagrangian approach for mechanical systems in the discrete context.
Bloch, Anthony M., Leok, Melvin, Marsden, Jerrold E., Zenkov, Dmitry V.   +3 more
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Dynamic Features of Low Embankment Subgrade on Expressways Under Traffic‐Induced Loads: Experimental and Numerical Study

Advances in Civil Engineering, Volume 2025, Issue 1, 2025.
The dynamic features of the subgrade are closely related to vehicle operation safety. Most of the previous studies are limited to the dynamic response of high embankments, therefore, in this study, the dynamic characteristics of low embankment subgrade under dynamic traffic loads are investigated through field tests and numerical simulations ...
Yonghui Shang, Linrong Xu, Donglei Jin, Meixia Wang, Qiancheng Fang, Huseyin Bilgin   +5 more
wiley   +1 more source

Isogeometric Approximation Methods Using the Interlineation Operators [PDF]

, 2016
Interlineation of functions of two or more variables is approximation of the functions by their traces or traces of some differential operators on the fixed system of lines.
Grytsai, Olga, Lytvyn, Oleg M., Lytvyn, Oleg O., Sergienko, Ivan, Tkachenko, Alexandr   +4 more
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Derivation of the Lorentz Transformations for Three‐Dimensional Relative Motion Between Inertial Frames of Reference

Advances in Mathematical Physics, Volume 2025, Issue 1, 2025.
Lorentz transformations are central to relativistic mechanics, explaining phenomena such as the mass–energy relationship, spatial contraction, momentum transformation, velocity addition, and the geometric structure of Minkowski space‐time. While traditionally derived for motion along a single spatial axis, these transformations can be generalized to ...
Chandra Bahadur Khadka, Zine El Abiddine Fellah   +1 more
wiley   +1 more source

An Advanced Computer Vision Method for Noncontact Vibration Measurement of Cables in Cable‐Stayed Bridges

Structural Control and Health Monitoring, Volume 2025, Issue 1, 2025.
With the development of computer and image processing technologies, computer vision (CV) has been attracting increasing attention in the field of civil engineering measurement and monitoring. Cables in slender structures have unique challenges for CV‐based vibration measurement methods, such as low pixel proportion and sensitivity to environmental ...
Naiwei Lu, Weiming Zeng, Jian Cui, Yuan Luo, Xiaofan Liu, Yang Liu, Francesc Pozo   +6 more
wiley   +1 more source

A Multistrategy Fusion–Improved Black Widow Optimization Algorithm for Structural Damage Identification

Structural Control and Health Monitoring, Volume 2025, Issue 1, 2025.
Structural damage identification based on metaheuristic algorithms is an important part of structural health monitoring with great potential. However, the metaheuristic intelligent algorithms probably have flaws of slow convergence speed and low calculation accuracy, which need to be improved to address engineering optimization problems. In this paper,
Zhen Chen, Wanying Li, Xiaoshuai Liu, Yikai Wang, Tommy H. T. Chan, Young-Jin Cha   +5 more
wiley   +1 more source

Effects of Distributed Tuned Mass Dampers on the Modal Response Characteristics of a 3‐DOF Structure With Closely Spaced Natural Frequencies

Structural Control and Health Monitoring, Volume 2025, Issue 1, 2025.
Distributed tuned mass dampers (DTMDs) have been widely employed for multimodal seismic response control of structures with closely spaced natural frequencies. However, the traditional mode‐by‐mode design approach neglects the coupling effects between modes and the synergistic effects among tuned mass dampers (TMDs), making it difficult to effectively ...
Shuyong He, Shouying Li, Zhengqing Chen, Lin Chen   +3 more
wiley   +1 more source

Wave detected by LIGO is not gravitational wave [PDF]

General Relativity defines gravity like the metric of a Lorentzian manifold. Einstein formulated spacetime as quality structural of gravity, i.e, circular definition between gravity and spacetime, also Einstein denoted "Space and time are modes by which ...
Guillen Gomez, Alfonso Leon
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