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Journal articles on the topic 'Pendulum waves'

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Published: 4 June 2021
Last updated: 7 February 2022

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1

MacIsaac, Dan. "Pendulum Waves: Compelling Videos." Physics Teacher 43, no. 9 (December 2005): 622. http://dx.doi.org/10.1119/1.2136468.

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2

Berg, Richard E. "Pendulum waves: A demonstration of wave motion using pendula." American Journal of Physics 59, no. 2 (February 1991): 186–87. http://dx.doi.org/10.1119/1.16608.

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3

Flaten, James A., and Kevin A. Parendo. "Pendulum waves: A lesson in aliasing." American Journal of Physics 69, no. 7 (July 2001): 778–82. http://dx.doi.org/10.1119/1.1349543.

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4

Snieder, Roel, Christoph Sens‐Schönfelder, Elmer Ruigrok, and Katsuhiko Shiomi. "Seismic shear waves as Foucault pendulum." Geophysical Research Letters 43, no. 6 (March 28, 2016): 2576–81. http://dx.doi.org/10.1002/2015gl067598.

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5

Nicola, Pozzi, Bracco Giovanni, Passione Biagio, Sirigu Sergej Antonello, Vissio Giacomo, Mattiazzo Giuliana, and Sannino Gianmaria. "Wave Tank Testing of a Pendulum Wave Energy Converter 1:12 Scale Model." International Journal of Applied Mechanics 09, no. 02 (March 2017): 1750024. http://dx.doi.org/10.1142/s1758825117500247.

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Wave Energy is a widespread, reliable renewable energy source. The early study on Wave Energy dates back in the 70’s, with a particular effort in the last and present decade to make Wave Energy Converters (WECs) more profitable and predictable. The PeWEC (Pendulum Wave Energy Converter) is a pendulum-based WEC. The research activities described in the present work aim to develop a pendulum converter for the Mediterranean Sea, where waves are shorter, thus with a higher frequency compared to the ocean waves, a characteristic well agreeing with the PeWEC frequency response. The mechanical equations of the device are developed and coupled with the hydrodynamic Cummins equation. The work deals with the design and experimental tank test of a 1:12 scale prototype. The experimental data recorded during the testing campaign are used to validate the numerical model previously described. The numerical model proved to be in good agreement with the experiments.
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6

DOSTAL, L., and M. A. PICK. "Theoretical and experimental study of a pendulum excited by random loads." European Journal of Applied Mathematics 30, no. 5 (September 18, 2018): 912–27. http://dx.doi.org/10.1017/s0956792518000529.

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Results on the behaviour of a pendulum which is parametrically excited by large amplitude random loads at its pivot are presented, including a novel experimental case study. Thereby, it is dealt with a random excitation by a non-white Gaussian stochastic process with prescribed spectral density. Special focus is devoted to stochastic processes resulting from random sea wave elevation and the question whether random sea waves can lead to rotational motion of the parametrically excited pendulum. The motivation for such an experimental study is energy harvesting from ocean waves.
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7

Shimoda, Tomofumi, Satoru Takano, Ching Pin Ooi, Naoki Aritomi, Yuta Michimura, Masaki Ando, and Ayaka Shoda. "Torsion-Bar Antenna: A ground-based mid-frequency and low-frequency gravitational wave detector." International Journal of Modern Physics D 29, no. 04 (March 4, 2019): 1940003. http://dx.doi.org/10.1142/s0218271819400030.

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Expanding the observational frequency of gravitational waves is important for the future of astronomy. Torsion-Bar Antenna (TOBA) is a mid-frequency and low-frequency gravitational wave detector using a torsion pendulum. The low resonant frequency of the rotational mode of the torsion pendulum enables ground-based observations. The overview of TOBA, including the past and present status of the prototype development, is summarized in this paper.
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8

Arief, I. S., I. K. A. P. Utama, R. Hantoro, J. Prananda, Y. Safitri, T. A. Rachmattra, and F. K. Rindu. "Response to Pontoon and Pendulum Motion at Wave Energy Converter Based on Pendulum System." E3S Web of Conferences 43 (2018): 01022. http://dx.doi.org/10.1051/e3sconf/20184301022.

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Energy conversion technology derived from ocean wave energy has been developed, one of them is the Power Wave sea-Pendulum System (PLTGL-SB). PLTGL composed of a pontoon which is subjected to the excitation force of ocean waves and will move the pendulum on the top of the pontoon. This study aims to analyze the best shape for PLTGL- SB’s pontoon and determine the largest deviation generated due to the movement of the pendulum vertical pontoon. Pontoon shapes studied are pontoon consisting of a large cylinder in the middle and there are two boats on the right and left, like a trimaran ship. Variations were made in this study consisted of variations of length and height boats, the draft height, wave period, the mass and the length of the pendulum arm. Best pontoon shape is determined by simulating the shape of a pontoon with Computational Fluid Dynamic (CFD). Pendulum deviation obtained by mathematical modeling pontoon two degrees of freedom (roll) and pendulum. Based on the chart Response Amplitude Operator (RAO) pontoon shape is best for PLTGL-SB is a pontoon with a 2/3 full large cylinder diameter, 1.5 cm height boats, catamarans length of 41.5 cm. Based on the results of a mathematical model of the largest deviation of the pendulum is generated when the pontoon is placed in the period of 0.8 s, with a mass and pendulum arm lengths are 19.9 g and 10.6 cm.
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9

Tian, Yu Feng, and Yan Huang. "Numerical Simulation of Interactions between Waves and Pendulum Wave Power Converter." Applied Mechanics and Materials 291-294 (February 2013): 1949–53. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.1949.

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The interactions between waves and the pendulum wave power converter were simulated, considering Navier-Stokes (N-S) equations as governing equations of the fluid, using the k-ε turbulence model and finite element software ADINA. The setting wave-generating boundary method and viscosity damping region method were developed in the numerical wave tank. Nodal velocities were applied on each layer of the inflow boundary in the setting wave-generating boundary method. The viscosity of the fluid in the damping region was obtained artificially in the viscosity damping region method, and the energy in the fluid was decreased by the viscosity in governing equations. The physical model tests were simulated with the fluid-structure interaction (FSI) numerical model. The numerical results were compared with the experimental data, and then the results were discussed. A reference method is advanced to design the pendulum wave power converter. The method to solve the complex FSI problems is explored.
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10

Bos, R. W., and P. R. Wellens. "Fluid–structure interaction between a pendulum and monochromatic waves." Journal of Fluids and Structures 100 (January 2021): 103191. http://dx.doi.org/10.1016/j.jfluidstructs.2020.103191.

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11

Kurlenya, M. V., V. N. Oparin, V. I. Vostrikov, V. V. Arshavskii, and N. Mamadaliev. "Pendulum waves. Part III: Data of on-site observations." Journal of Mining Science 32, no. 5 (September 1996): 341–61. http://dx.doi.org/10.1007/bf02046155.

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12

French, M. J. "Tadpole: A Design Problem in the Mechanics of the Use of Sea Wave Energy." Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy 210, no. 4 (August 1996): 273–77. http://dx.doi.org/10.1243/pime_proc_1996_210_046_02.

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A study is made of a device for obtaining electrical energy from sea waves, in which the problem of providing a reaction against the wave forces is met by a combination of a pendulum and gyroscopes. The mechanics is developed in a logical manner which gives a clear insight into the function, the pendulum providing the reaction force, which leaves an unbalanced moment to be countered by the gyroscopes, which also constitute the power take-off. The result is a relatively small machine with no external moving parts. The treatment requires no understanding of wave hydrodynamics. It is felt this paper may be of special interest as a design study, in which the relation between the mechanics and the development of the concept is peculiarly cogent.
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13

Bermeo-Ovalle, Adriana. "Triphasic Waves: Swinging the Pendulum Back in this Diagnostic Dilemma." Epilepsy Currents 17, no. 1 (January 2017): 40–42. http://dx.doi.org/10.5698/1535-7511-17.1.40.

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14

Bos, R. W., and P. R. Wellens. "Fluid structure interaction between a pendulum and focused breaking waves." Physics of Fluids 33, no. 6 (June 2021): 062118. http://dx.doi.org/10.1063/5.0054426.

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15

Wang, Dong Jiao, Shou Qiang Qiu, and Jia Wei Ye. "Study on the Hydrodynamics of a Single-Acting Pendulum Wave Energy Converter." Applied Mechanics and Materials 518 (February 2014): 209–14. http://dx.doi.org/10.4028/www.scientific.net/amm.518.209.

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Based on the three dimensional potential theory, numerical studies were carried out to investigate the hydrodynamics of a single-acting trapezoidal pendulum wave energy converter in regular waves by using time domain analysis. The nonlinear viscous damping was also taken into account, and the influence of power take-off damping on the motion responses and output performances were analyzed. Comparisons of experimental and numerical results were performed as part of the validation process.
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16

Aleksandrova, N. I., A. G. Chernikov, and E. N. Sher. "On attenuation of pendulum-type waves in a block rock mass." Journal of Mining Science 42, no. 5 (September 2006): 468–75. http://dx.doi.org/10.1007/s10913-006-0075-y.

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17

Cagnoli, G., J. Hough, D. DeBra, M. M. Fejer, E. Gustafson, S. Rowan, and V. Mitrofanov. "Damping dilution factor for a pendulum in an interferometric gravitational waves detector." Physics Letters A 272, no. 1-2 (July 2000): 39–45. http://dx.doi.org/10.1016/s0375-9601(00)00411-4.

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18

Zhu, Changqing, Juanmian Lei, Yecun Wu, Nan Li, Da Chen, and Qingfan Shi. "Experimental observation of solitary waves in a new designed pendulum chain system." European Journal of Physics 36, no. 4 (April 23, 2015): 045002. http://dx.doi.org/10.1088/0143-0807/36/4/045002.

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19

Aleksandrova, N. I. "Pendulum Waves on the Surface of Block Rock Mass under Dynamic Impact." Journal of Mining Science 53, no. 1 (January 2017): 59–64. http://dx.doi.org/10.1134/s1062739117011847.

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20

Delplace, Pierre, and Antoine Venaille. "From the geometry of Foucault pendulum to the topology of planetary waves." Comptes Rendus. Physique 21, no. 2 (November 3, 2020): 165–75. http://dx.doi.org/10.5802/crphys.28.

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21

Долгих, Г. И. "Принципы построения "деформационной антенны Земли"." Письма в журнал технической физики 46, no. 7 (2020): 3. http://dx.doi.org/10.21883/pjtf.2020.07.49210.17959.

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The principles of creation of "the deformation antenna of Earth" in the territory of Russia intended for registration and direction finding of fluctuations and waves of wide range of frequencies are discussed (from infrasonic to the range of gravitational waves). Placing laser strainmeters of classical and pendulum types in certain points of Russia, it is possible to receive the unique complex surpassing a LIGO project complex in sensitivity and frequency range.
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22

Garcés-Gómez, Yeison Alberto, Paula Andrea López Jimenez, Oscar Oswaldo Cárdenas Delgado, Vladimir Henao Cespedes, and Nicolás Toro García. "Experimental Verification of two Theoretical Solutions of the Pendulum for Large Angles in Frequency Domain for Teaching Support." International Journal of Interactive Mobile Technologies (iJIM) 14, no. 08 (May 20, 2020): 140. http://dx.doi.org/10.3991/ijim.v14i08.12607.

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During pendulum analysis, the approximation for small angles is usually performed as a simple harmonic motion. However, for large angles, this approximation is not convenient so exact solutions are proposed by differ-ent methods. This paper presents the comparison of two solutions for the displacement of the pendulum in the domain of time and frequency, the solution by Jacobi elliptic function and the solution by the numerical method Dormand-Prince with the results of measurements obtained by means of a physical prototype designed for the teaching of physics. We consider that this comparative study allows a better understanding of the phenomenon of the non-linear pendulum in the students of undergraduate careers in the physics of waves as well as a previous training for the course of analysis of signals being in good exercise of teaching
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23

Qin, Kan, Kai Luo, Dai Jin Li, Miao Li, and Feng Hu. "Design of a Novel Oceanic Oscillating Power Generation System." Advanced Materials Research 366 (October 2011): 429–33. http://dx.doi.org/10.4028/www.scientific.net/amr.366.429.

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Oscillating Power Generation; Oceanic Wave Energy; Simulation and Testing Abstract: A new kind of oscillating power generation device utilizing ocean waves has been designed and developed. The basic composition and scheme of conversion devices has been introduced, with the structure design being completed. Theoretical basis of the system has been analyzed and verified by test. Theory and test shows that the load voltage is 1.5V under the condition that the pendulum moves at a frequency of 0.5Hz. Power efficiency of the device is good, while structure reliability is high, and it possesses a roomy future.
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24

Kosevich, Yuriy A. "Non-linear mechanical analogue of quantum Rabi oscillations in coherent output coupler for atoms in Bose-Einstein condensate." Journal of Micromechanics and Molecular Physics 01, no. 01 (April 2016): 1650007. http://dx.doi.org/10.1142/s2424913016500077.

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The analogies between coherent matter waves in Bose–Einstein condensates of atomic gases and coherent photons have been discussed in connection with possible realization of an “atom laser”. Theoretical discussions of the atom laser have considered the case in which atoms are fed into and coupled out of the condensate continuously. Here, we discuss the analogy between the output coupler for the trapped coherent matter waves and collective non-linear energy transfer in a system of three-coupled mechanical oscillators (pendulums) with variable parameters. One pendulum in the system is weakly coupled through a spring with the pair of pendulums, which are tightly bound through a common string. We show that self-sustained oscillations of the energy distribution between the weakly coupled and tightly bound subsystems can occur. In our simulations, the coherent fraction of the total mechanical energy of the system, which is periodically transferred to the weakly linked subsystem, can be of the order of 1/1000 and even smaller. These periodic oscillations in vibrational energy distribution can be considered as mechanical analogue, with a similar time evolution, of the quantum Rabi oscillations in the populations of the trapped and untrapped (out-coupled) states in the coherent output coupler for atoms in the Bose–Einstein condensate. The described effects can be used for the coherent control of the transfer of mechanical energy on the micro- and nano-scales.
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25

Kurlenya, M. V., V. N. Oparin, and V. I. Vostrikov. "Pendulum-type waves. Part II: Experimental methods and main results of physical modeling." Journal of Mining Science 32, no. 4 (July 1996): 245–73. http://dx.doi.org/10.1007/bf02046215.

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26

Wang, Dong-jiao, Shou-qiang Qiu, and Jia-wei Ye. "An experimental study on a trapezoidal pendulum wave energy converter in regular waves." China Ocean Engineering 29, no. 4 (June 2015): 623–32. http://dx.doi.org/10.1007/s13344-015-0044-9.

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27

WANG, Kaixing, Yishan PAN, and Linming DOU. "STUDY OF ENERGY TRANSFER ON PENDULUM-TYPE WAVES PROPAGATION IN BLOCK-ROCK MASS." Mining informational and analytical bulletin, S23 (2017): 255–57. http://dx.doi.org/10.25018/0236-1493-2017-10-23-255-257.

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28

Sirigu, Sergej Antonello, Ludovico Foglietta, Giuseppe Giorgi, Mauro Bonfanti, Giulia Cervelli, Giovanni Bracco, and Giuliana Mattiazzo. "Techno-Economic Optimisation for a Wave Energy Converter via Genetic Algorithm." Journal of Marine Science and Engineering 8, no. 7 (June 30, 2020): 482. http://dx.doi.org/10.3390/jmse8070482.

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Although sea and ocean waves have been widely acknowledged to have the potential of providing sustainable and renewable energy, the emergence of a self-sufficient and mature industry is still lacking. An essential condition for reaching economic viability is to minimise the cost of electricity, as opposed to simply maximising the converted energy at the early design stages. One of the tools empowering developers to follow such a virtuous design pathway is the techno-economic optimisation. The purpose of this paper is to perform a holistic optimisation of the PeWEC (pendulum wave energy converter), which is a pitching platform converting energy from the oscillation of a pendulum contained in a sealed hull. Optimised parameters comprise shape; dimensions; mass properties and ballast; power take-off control torque and constraints; number and characteristics of the pendulum; and other subcomponents. Cost functions are included and the objective function is the ratio between the delivered power and the capital expenditure. Due to its ability to effectively deal with a large multi-dimensional design space, a genetic algorithm is implemented, with a specific modification to handle unfeasible design candidate and improve convergence. Results show that the device minimising the cost of energy and the one maximising the capture width ratio are substantially different, so the economically-oriented metric should be preferred.
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29

Orszaghova, J., H. Wolgamot, S. Draper, R. Eatock Taylor, P. H. Taylor, and and A. Rafiee. "Transverse motion instability of a submerged moored buoy." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 475, no. 2221 (January 2019): 20180459. http://dx.doi.org/10.1098/rspa.2018.0459.

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Wave energy converters and other offshore structures may exhibit instability, in which one mode of motion is excited parametrically by motion in another. Here, theoretical results for the transverse motion instability (large sway oscillations perpendicular to the incident wave direction) of a submerged wave energy converter buoy are compared to an extensive experimental dataset. The device is axi-symmetric (resembling a truncated vertical cylinder) and is taut-moored via a single tether. The system is approximately a damped elastic pendulum. Assuming linear hydrodynamics, but retaining nonlinear tether geometry, governing equations are derived in six degrees of freedom. The natural frequencies in surge/sway (the pendulum frequency), heave (the springing motion frequency) and pitch/roll are derived from the linearized equations. When terms of second order in the buoy motions are retained, the sway equation can be written as a Mathieu equation. Careful analysis of 80 regular wave tests reveals a good agreement with the predictions of sub-harmonic (period-doubling) sway instability using the Mathieu equation stability diagram. As wave energy converters operate in real seas, a large number of irregular wave runs is also analysed. The measurements broadly agree with a criterion (derived elsewhere) for determining the presence of the instability in irregular waves, which depends on the level of damping and the amount of parametric excitation at twice the natural frequency.
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30

LEVI, MARK. "GEOMETRY OF VIBRATIONAL STABILIZATION AND SOME APPLICATIONS." International Journal of Bifurcation and Chaos 15, no. 09 (September 2005): 2747–56. http://dx.doi.org/10.1142/s0218127405013745.

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This paper gives a short overview of various applications of stabilization by vibration, along with the exposition of the geometrical mechanism of this phenomenon. More specifically, the following observation is described: a rapidly vibrated holonomic system can be approximated by a certain associated nonholonomic system. It turns out that effective forces in some rapidly vibrated (holonomic) systems are the constraint forces of an associated auxiliary nonholonomic constraint. In particular, we review a simple but remarkable connection between the curvature of the pursuit curve (the tractrix) on the one hand and the effective force on the pendulum with vibrating support. The latter observation is a part of a recently discovered close relationship between two standard classical problems in mechanics: (1) the pendulum whose suspension point executes fast periodic motion along a given curve, and (2) the Chaplygin skate (known also as the Prytz planimeter, or the "bicycle"). The former is holonomic, the latter is nonholonomic. The holonomy of the skate shows up in the effective motion of the pendulum. This relationship between the pendulum with a twirled pivot and the Chaplygin skate has somewhat unexpected physical manifestations, such as the drift of suspended particles in acoustic waves. Finally, a higher-dimensional example of "geodesic motion" on a vibrating surface is described.
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31

Li, S. H., W. C. Zhu, L. L. Niu, and F. Dai. "Constant Strain Rate Uniaxial Compression of Green Sandstone during SHPB Tests Driven by Pendulum Hammer." Shock and Vibration 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/2619081.

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During the Split-Hopkinson pressure bar (SHPB) tests driven by pendulum hammer, employing a proper special shape striker is an effective way to obtain dynamic stress equilibrium condition and to get constant strain rate of the rock specimen. To find the proper special shape striker, a striker with a cambered surface was introduced and eight geometrically different hammers were designed to analyze the effect of hammer geometry on the waveform of excited incident stress waves. Based on experiments and simulations, parameter effects, including the cambered hammer curvature radius and hammer diameter, length, and impact velocity, on the incident wave shape were examined. These parametric studies provided guidelines for achieving constant strain rates in rock specimens during SHPB tests. The use of different diameter hammers was noted for shaping stress-time curves to follow the stress-strain behavior of green sandstone. Finally, to examine the applicability of using hammer geometry for shaping incident waves to achieve constant strain rate, SHPB tests on green sandstone specimens were conducted. The results demonstrated that a constant strain rate (100 s−1) lasting for 70 μs was achieved with the 8# hammer (3.7 kg; curvature radius, diameter, and length of 100, 70, and 126.3 mm, resp.). In addition, dynamic experiments on green sandstone were carried out under various strain rates and the results showed that the initial tangential modulus was almost unaffected by strain rate. The strain at peak stress tended to increase with rising strain rate and the dynamic strength of green sandstone showed an apparent rate dependency.
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32

KOBAYASHI, Hidetaka, Chang-Kyu RHEEM, and Koki MARUYAMA. "Evaluation of the Pendulum Type Wave Power Generation System (Wave Rudder) for Irregular Waves." Journal of Japan Society of Civil Engineers, Ser. B2 (Coastal Engineering) 69, no. 2 (2013): I_1321—I_1325. http://dx.doi.org/10.2208/kaigan.69.i_1321.

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33

Aleksandrova, N. I. "Propagation of Pendulum Waves under Deep-Seated Cord Charge Blasting in Blocky Rock Mass." Journal of Mining Science 53, no. 5 (September 2017): 824–30. http://dx.doi.org/10.1134/s1062739117052837.

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34

Aleksandrova, NI. "Three-dimensional modeling of pendulum waves propagation under dynamic loading of underground excavation surface." IOP Conference Series: Earth and Environmental Science 773, no. 1 (May 1, 2021): 012004. http://dx.doi.org/10.1088/1755-1315/773/1/012004.

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35

Liu, Ting Ting, Yong Wu, and Jun Lin. "Data Acquisition System Connect to CMG-3T Low-Frequency Seismic Pendulum." Advanced Materials Research 734-737 (August 2013): 2945–48. http://dx.doi.org/10.4028/www.scientific.net/amr.734-737.2945.

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Aiming at the low-frequency performance of the lowfrequency seismic pendulum CMG -3T, we design a data acquisition system can acquire the low-frequency seismic waves, at the same time we accomplish the process of adjusting the CMG-3T. This paper gives designing scheme include the low noise design of the power module, the design of the connector to RS232 which can send command to adjusting the mass of CMG-3T,the design of voltage attenuation network and no-source low-pass filter network of data acquisition system, the last is the design of software for adjusting the CMG-3T.
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36

BENIELLI, DOMINIQUE, and JOËL SOMMERIA. "Excitation and breaking of internal gravity waves by parametric instability." Journal of Fluid Mechanics 374 (November 10, 1998): 117–44. http://dx.doi.org/10.1017/s0022112098002602.

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We study the dynamics of internal gravity waves excited by parametric instability in a stably stratified medium, either at the interface between a water and a kerosene layer, or in brine with a uniform gradient of salinity. The tank has a rectangular section, and is narrow to favour standing waves with motion in the vertical plane. The fluid container undergoes vertical oscillations, and the resulting modulation of the apparent gravity excites the internal waves by parametric instability.Each internal wave mode is amplified for an excitation frequency close to twice its natural frequency, when the excitation amplitude is sufficient to overcome viscous damping (these conditions define an ‘instability tongue’ in the parameter space frequency-amplitude). In the interfacial case, each mode is well separated from the others in frequency, and behaves like a simple pendulum. The case of a continuous stratification is more complex as different modes have overlapping instability tongues. In both cases, the growth rates and saturation amplitudes behave as predicted by the theory of parametric instability for an oscillator. However, complex friction effects are observed, probably owing to the development of boundary-layer instabilities.In the uniformly stratified case, the excited standing wave is unstable via a secondary parametric instability: a wave packet with small wavelength and half the primary wave frequency develops in the vertical plane. This energy transfer toward a smaller scale increases the maximum slope of the iso-density surfaces, leading to local turning and rapid growth of three-dimensional instabilities and wave breaking. These results illustrate earlier stability analyses and numerical studies. The combined effect of the primary excitation mechanism and wave breaking leads to a remarkable intermittent behaviour, with successive phases of growth and decay for the primary wave over long timescales.
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37

Galent, Marcin. "Trust in the Everyday Life of Guests and Hosts: Employers and Employees in Belgium." European Review 16, no. 4 (October 2008): 573–83. http://dx.doi.org/10.1017/s1062798708000410.

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The collapse of the Iron Curtain, and recent European enlargement have brought about new waves of intra-European migration. Whilst millions of people from Central and Eastern European countries have trodden the well-worn path to the West in search of better paid jobs, their migration trajectories have differed from traditional patterns. They very often work in host countries and simultaneously maintain close social links with their countries of origin, thus earning the label ‘pendulum migrants’. These pendulum movements can be perceived as agents that stimulate processes of social integration at the micro level. Contrary to popular discourse, which represents migration as a phenomenon endangering social cohesion, this article investigates how personal contacts between hosts and guests may contribute to the building of mutual trust between European citizens.
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38

Shved, G. M., N. V. Karpova, L. N. Petrova, E. G. Orlov, and S. I. Ermolenko. "Steady-frequency waves at intradiurnal periods from simultaneous co-located microbarometer and seismometer measurements: a case study." Annales Geophysicae 29, no. 6 (June 29, 2011): 1153–67. http://dx.doi.org/10.5194/angeo-29-1153-2011.

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Abstract. Simultaneous co-located microbarometer and vertical-pendulum seismometer measurements at St. Petersburg (59.9° N, 29.8° E) with total duration of 4 months are used to study atmospheric oscillations at steady frequencies at periods shorter than 8 h. The temporal behavior of the phase shift between oscillations detected simultaneously by both instruments is analyzed for oscillations of periods up to as short as ~0.5 h. Some of oscillations last up to several days. For the 42–90 min and 2.5–5 h period ranges, the temporal behavior of the power spectra are considered and correlated with the atmospheric angular momentum of zonal wind, tropical cyclones and large earthquakes. Signatures of sequences of subharmonics of the solar tide are revealed with periods up to day/30. There are indications of effects of the 5-day planetary waves and tropical cyclones on wave activity in the ~1–5 h period range. A weak increase of wave activity is observed when large earthquakes occur.
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39

Oparin, V. N., V. V. Adushkin, T. A. Kiryaeva, V. P. Potapov, A. A. Cherepov, V. G. Tyukhrin, and A. V. Glumov. "Effect of Pendulum Waves from Earthquakes on Gas-Dynamic Behavior of Coal Seams in Kuzbass." Journal of Mining Science 54, no. 1 (January 2018): 1–12. http://dx.doi.org/10.1134/s1062739118013269.

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40

Bagaev, S. N., V. N. Oparin, V. A. Orlov, S. V. Panov, and M. D. Parushkin. "Pendulum waves and their singling out in the laser deformograph records of the large earthquakes." Journal of Mining Science 46, no. 3 (May 2010): 217–24. http://dx.doi.org/10.1007/s10913-010-0028-3.

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41

Kurlenya, M. V., V. N. Oparin, and V. I. Vostrikov. "Pendulum-type waves. Part I: State of the problem and measuring instrument and computer complexes." Journal of Mining Science 32, no. 3 (May 1996): 159–63. http://dx.doi.org/10.1007/bf02046583.

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42

Gyarmati, G., I. Szunyogh, and D. J. Patil. "Local predictability in a simple model of atmospheric balance." Nonlinear Processes in Geophysics 10, no. 3 (June 30, 2003): 183–96. http://dx.doi.org/10.5194/npg-10-183-2003.

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Abstract. The 2 degree-of-freedom elastic pendulum equations can be considered as the lowest order analogue of interacting low-frequency (slow) Rossby-Haurwitz and high-frequency (fast) gravity waves in the atmosphere. The strength of the coupling between the low and the high frequency waves is controlled by a single coupling parameter, e, defined by the ratio of the fast and slow characteristic time scales. In this paper, efficient, high accuracy, and symplectic structure preserving numerical solutions are designed for the elastic pendulum equation in order to study the role balanced dynamics play in local predictability. To quantify changes in the local predictability, two measures are considered: the local Lyapunov number and the leading singular value of the tangent linear map. It is shown, both based on theoretical considerations and numerical experiments, that there exist regions of the phase space where the local Lyapunov number indicates exceptionally high predictability, while the dominant singular value indicates exceptionally low predictability. It is also demonstrated that the local Lyapunov number has a tendency to choose instabilities associated with balanced motions, while the dominant singular value favors instabilities related to highly unbalanced motions. The implications of these findings for atmospheric dynamics are also discussed.
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43

Li, Bing, Bin Wang, Shaohua Wang, and Xiao Wu. "Energy Response Analysis of Continuous Beam Bridges with Friction Pendulum Bearing by Multihazard Source Excitations." Shock and Vibration 2020 (July 6, 2020): 1–17. http://dx.doi.org/10.1155/2020/3724835.

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Based on the principle of conservation of energy, analytical modelling of the energy response of continuous beam bridges with friction pendulum bearing (FPB) was carried out for foundation-induced vibrations. A three-dimensional finite element analysis of a multispan continuous concrete girder bridge with FPB was established using the nonlinear time-history method to verify the accuracy of analytical modelling. The influence of the friction coefficient and isolation period of the FPB on the energy response of isolated bridge was then investigated under multihazard source excitations (e.g., El Centro and Taft waves) with different dominant periods and durations. The variations of structural response energy, sliding displacement, energy dissipation ratio, and acceleration of the isolated bridges are plotted. The results of analytical modelling and finite element simulation show good agreement. In addition, there exist particular values of the friction coefficient and isolation period of FPB, for which the structural response energy of the isolated bridges attains the minimum value. The optimal parameters of FPB are greatly influenced by seismic waves, and the friction coefficient of FPB should be increased with the increase of seismic fortification intensity. In addition, the energy dissipation capacity of FPB used in isolated bridge is excellent.
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44

Lenci, S. "On the Production Of Energy From Sea Waves By a Rotating Pendulum: A Preliminary Experimental Study." Journal of Applied Nonlinear Dynamics 3, no. 2 (June 2014): 187–201. http://dx.doi.org/10.5890/jand.2014.06.008.

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45

Aleksandrova, N. I., E. N. Sher, and A. G. Chernikov. "Effect of viscosity of partings in block-hierarchical media on propagation of low-frequency pendulum waves." Journal of Mining Science 44, no. 3 (May 2008): 225–34. http://dx.doi.org/10.1007/s10913-008-0012-3.

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46

Lugovoi, Vladimir, Igor Rasskazov, Denis Tsoi, Maksim Rasskazov, and Aleksandr Sidliar. "The research of remote earthquakes impact on the intensity of geomechanical processes in burst-hazardous rock massif." E3S Web of Conferences 56 (2018): 02018. http://dx.doi.org/10.1051/e3sconf/20185602018.

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Brief summary of works on the detection of pendulum waves intensifying geomechanical processes in rock massif, with the application of high-sensitivity laser measurements, is represented in the article. Peculiarities and technical characteristics of laser deformograph applied as part of comprehensive geodynamic monitoring system in the area of “Streltsovskoe” ore field have been taken into consideration. The results of experimental research for the evaluation of remote earthquakes impact on the condition of rock massif of “Streltsovskoe” ore field, registration of remote earthquakes and their forerunners are given.
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47

Toyota, Kazutaka, Shuichi Nagata, Yasutaka Imai, Toshiaki Setoguchi, and Keisuke Ono. "A Study on Floating Type Pendulum Wave Energy Converter(1st Report ) -Energy Conversion Characteristics in Regular Waves-." Journal of the Japan Society of Naval Architects and Ocean Engineers 13 (2011): 67–74. http://dx.doi.org/10.2534/jjasnaoe.13.67.

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48

Adushkin, V. V., and V. N. Oparin. "From the alternating-sign explosion response of rocks to the pendulum waves in stressed geomedia. Part III." Journal of Mining Science 50, no. 4 (July 2014): 623–45. http://dx.doi.org/10.1134/s1062739114040024.

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49

Adushkin, V. V., and V. N. Oparin. "From the alternating-sign explosion response of rocks to the pendulum waves in stressed geomedia. Part IV." Journal of Mining Science 52, no. 1 (January 2016): 1–35. http://dx.doi.org/10.1134/s106273911601009x.

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50

Adushkin, V. V., and V. N. Oparin. "From the alternating-sign explosion response of rocks to the pendulum waves in stressed geomedia. Part I." Journal of Mining Science 48, no. 2 (March 2012): 203–22. http://dx.doi.org/10.1134/s1062739148020013.

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