Relevant bibliographies by topics / Pendulum waves

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Pendulum waves'

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Published: 4 June 2021
Last updated: 7 February 2022

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Journal articles on the topic "Pendulum waves"

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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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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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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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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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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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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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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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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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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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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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Dissertations / Theses on the topic "Pendulum waves"

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Xu, Xu. "Nonlinear dynamics of parametric pendulum for wave energy extraction." Thesis, University of Aberdeen, 2005. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?pid=189414.

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A new concept, extracting energy from sea waves by parametric pendulor, has been explored in this project. It is based on the conversion of vertical oscillations to rotational motion by means of a parametrically-excited pendulor, i.e. a pendulum operating in rotational mode. The main advantage of this concept lies in a direct conversion from vertical oscillations to rotations of the pendulum pivot. This thesis, firstly, reviewed a number of well established linear and nonlinear theories of sea waves and Airy’s sea wave model has been used in the modelling of the sea waves and a parametric pendulum excited by sea waves. The third or fifth order Stokes’s models can be potentially implemented in the future studies. The equation of motion obtained for a parametric pendulum excited by sea waves has the same form as for a simple parametrically-excited pendulum. Then, to deepen the fundamental understanding, an extensive theoretical analysis has been conducted on a parametrically-excited pendulum by using both numerical and analytical methods. The numerical investigations focused on the bifurcation scenarios and resonance structures, particularly, for the rotational motions. Analytical analysis of the system has been performed by applying the perturbation techniques. The approximate solutions, resonance boundary and existing boundary of rotations have been obtained with a good correspondence to numerical results. The experimental study has been carried out by exploring oscillations, rotations and chaotic motions of the pendulum.
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Sturgess, Keith Alan. "A study of the amplification of laser and VLF waves using a simple pendulum model." Thesis, Monterey, Calif. : Springfield,Va. : Naval Postgraduate School ; Available from National Technical Information Service, 1993. http://handle.dtic.mil/100.2/ADA270857.

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Silva, Jean Carlo de Sousa e. "Aplicação do mínimo múltiplo comum generalizado nas ondas de pêndulos." Universidade Federal de Goiás, 2016. http://repositorio.bc.ufg.br/tede/handle/tede/5719.

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Submitted by Luciana Ferreira (lucgeral@gmail.com) on 2016-07-14T12:48:19Z No. of bitstreams: 2 Dissertação - Jean Carlo de Sousa e Silva - 2016.pdf: 1067779 bytes, checksum: b4f60747c4efb9967cd66d2dba3afc20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
Approved for entry into archive by Luciana Ferreira (lucgeral@gmail.com) on 2016-07-14T12:49:42Z (GMT) No. of bitstreams: 2 Dissertação - Jean Carlo de Sousa e Silva - 2016.pdf: 1067779 bytes, checksum: b4f60747c4efb9967cd66d2dba3afc20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5)
Made available in DSpace on 2016-07-14T12:49:42Z (GMT). No. of bitstreams: 2 Dissertação - Jean Carlo de Sousa e Silva - 2016.pdf: 1067779 bytes, checksum: b4f60747c4efb9967cd66d2dba3afc20 (MD5) license_rdf: 0 bytes, checksum: d41d8cd98f00b204e9800998ecf8427e (MD5) Previous issue date: 2016-03-30
The simple pendulums have oscillatory and periodic movements. Thus, if we analyze some of them with independent movements, they may again return to be in the same spot, if your periods are comensurávies. We present the basic concepts needed to understand this phenomenon. Ending with a hint of implementation.
Os pêndulos simples possuem movimentos oscilatórios e periódicos. Assim, se analisarmos alguns deles com movimentos independentes, eles poderão voltar a se encontrar no mesmo ponto se seus períodos forem comensurávies. Para isso apresentamos os conceitos básicos necessários para a compreensão desse fenômeno. Finalizando com uma sugestão de aplicação do mesmo.
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Eroz, Murat. "Advanced models for sliding seismic isolation and applications for typical multi-span highway bridges." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19709.

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Thesis (Ph.D)--Civil and Environmental Engineering, Georgia Institute of Technology, 2008.
Committee Chair: DesRoches, Reginald; Committee Member: Goodno, Barry; Committee Member: Jacobs, Laurence; Committee Member: Streator, Jeffrey; Committee Member: White, Donald.
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Killbourn, Stuart Duncan. "Double pendulums for terrestrial interferometric gravitational wave detectors." Thesis, University of Glasgow, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362943.

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Horton, Bryan. "Rotational motion of pendula systems for wave energy extraction." Thesis, Available from the University of Aberdeen Library and Historic Collections Digital Resources, 2009. http://digitool.abdn.ac.uk:80/webclient/DeliveryManager?application=DIGITOOL-3&owner=resourcediscovery&custom_att_2=simple_viewer&pid=25873.

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Volanksy, Ami. "Order out of disorder : the 'pendulum syndrome' of centralization and decentralization processes in education - the case of England and Wales." Thesis, University of Oxford, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.315908.

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Nie, Chunyong. "Modeling of Wave Impact Using a Pendulum System." Thesis, 2010. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7950.

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For high speed vessels and offshore structures, wave impact, a main source of environmental loads, causes high local stresses and structural failure. However, the prediction of wave impact loads presents numerous challenges due to the complex nature of the instant structure-fluid interaction. The purpose of the present study is to develop an effective wave impact model to investigate the dynamic behaviors of specific shaped elements as they impact waves. To achieve this objective, a wave impact model with a body swinging on a pendulum system is developed. The body on the pendulum goes through a wave free surface driven by gravity at the pendulum's natural frequency. The system's motion and impact force during the entire oscillation time beginning from the instant of impact are of interest. The impact force is calculated by applying von Karman's method, which is based on momentum considerations. The usual wave forces are presented in the Morison's equation and incorporated into dynamic systems with other wave forces. For each body shape, the dynamic system is described by a strongly nonlinear ordinary differential equation and then solved by a Runge-Kutta differential equation solver. The dynamic response behavior and the impact force time history are obtained numerically and the numerical results show support the selection of a pendulum model as an efficient approach to study slamming loads. The numerical prediction of this model is compared to previous experiments and classification society codes. Moreover, a basic design of wave impact experiments using this pendulum model is proposed to provide a more accurate comparison between numerical results and experimental data for this model. This design will also serve as a first look at the experimental application of the pendulum model for the purpose of forecasting slamming force.
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"Optical analogue of interacting quantum and mechanical systems: spin and plane pendulum." 2013. http://library.cuhk.edu.hk/record=b5884310.

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Au-Yeung, Kin Chung = 以光學模擬量子自旋和機械鐘擺的相互作用 / 歐陽健聰.
Thesis (M.Phil.)--Chinese University of Hong Kong, 2013.
Includes bibliographical references (leaves 80-81).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstracts also in Chinese.
Au-Yeung, Kin Chung = Yi guang xue mo ni liang zi zi xuan he ji xie zhong bai de xiang hu zuo yong / Ouyang Jiancong.
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Lin, Kuen-Lin, and 林坤霖. "Application of Fuzzy System in Jellyfish type pendulum wave form power generating system." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/15460549169832672636.

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碩士
國立高雄海洋科技大學
電訊工程研究所
101
The wave power generation system proposed in this study was designed with the wave potential energy difference and the objective quality difference. In order to improve the overall power generation efficiency, the system adopted the Fuzzy System Arduino Controller, so that the generation system is capable of self-learning and variation. The actuation principle of the wave power generation system includes Energy-Work Transformations, Energy Conservation Law, Archimedes principleand Simple Harmonic Motion.
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Books on the topic "Pendulum waves"

1

Sturgess, Keith Alan. A study of the amplification of laser and VLF waves using a simple pendulum model. Monterey, Calif: Naval Postgraduate School, 1993.

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Inc, Earthquake Protection Systems, and Highway Innovative Technology Evaluation Center (U.S.), eds. Evaluation findings for Earthquake Protection Systems, Inc.: Friction pendulum bearings. Washington, DC: Civil Engineering Research Foundation, 1998.

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Cato, Molly Scott. The Pit and the Pendulum: A Cooperative Future for Work in the Welsh Valleys (Politics and Society in Wales series). University of Wales Press, 2004.

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Book chapters on the topic "Pendulum waves"

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Morozov, A. D. "On Resonances, Pendulum Equations, Limit Cycles and Chaos." In Nonlinear Waves 3, 276–82. Berlin, Heidelberg: Springer Berlin Heidelberg, 1990. http://dx.doi.org/10.1007/978-3-642-75308-4_25.

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Filippov, Alexandre T. "From Pendulum to Waves and Solitons." In The Versatile Soliton, 95–128. Boston: Birkhäuser Boston, 2010. http://dx.doi.org/10.1007/978-0-8176-4974-6_5.

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Moshchuk, N. K., R. A. Ibrahim, R. Z. Khasminskii, and P. L. Chow. "Ship Capsizing in Random Sea Waves and the Mathentical Pendulum." In IUTAM Symposium on Advances in Nonlinear Stochastic Mechanics, 299–309. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-0321-0_28.

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Archi, Mostefa, and Jean-Baptiste Casimir. "Realization of Le Rolland-Sorin's Double Pendulum and Some Experimental Results." In Mechanical Characterization of Materials and Wave Dispersion, 305–33. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118621264.ch12.

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Archi, Mostefa, and Jean-Baptiste Casimir. "Very Low Frequency Vibration of a Rod by Le Rolland-Sorin's Double Pendulum." In Mechanics of Viscoelastic Materials and Wave Dispersion, 425–91. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118623114.ch8.

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Fowler, Andrew. "The Scientific Legacy of George Gabriel Stokes." In George Gabriel Stokes, 197–216. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198822868.003.0011.

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The scientific legacy of George Gabriel Stokes is considered. Certain aspects of Stokes’s research work are reviewed and related to more recent fields of research. These include the Navier–Stokes equations and other approaches to rational continuum mechanics, the issue of existence of solutions, the boundary no-slip condition; Stokes flow and the issue of pendulum drag; the Hele-Shaw cell, viscous fingering, wavelength selection in pattern formation; moving contact lines; the highest water wave, rogue waves, the NLS equation; Stokes lines, exponential asymptotics, dendrite growth, slow manifods, and diffraction.
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Nicholson, James C. "Progress." In Racing for America, 32–57. University Press of Kentucky, 2021. http://dx.doi.org/10.5810/kentucky/9780813180649.003.0003.

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Chapter two explains the shutdown of racing in New York following the passage of a series of anti-gambling laws pushed by governor Charles Evans Hughes amid a national wave of Progressive Era reform. With racing banned in all but a few American jurisdictions in the early twentieth century, leading owners sent their stock to Europe. Jockeys and trainers followed. The glut of American horses flooding Great Britain sewed animosity between horsemen of the two nations. With the onset of World War I, American equestrians began a mass exodus back to the states, though resentments remained. Upon the war's conclusion, American racing would enjoy a period of rebirth as the political pendulum moved away from the Progressive spirit that had dominated American politics in the first two decades of the twentieth century and back toward a laissez-faire ethos.
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Wang, K., and Y. Pan. "Dynamic response of tunnel wall on pendulum-type wave propagation in block-hierarchical rock mass." In Rock Dynamics and Applications - State of the Art, 603–9. CRC Press, 2013. http://dx.doi.org/10.1201/b14916-81.

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Leigh, R. John, and David S. Zee. "Diagnosis of Nystagmus and Saccadic Intrusions." In The Neurology of Eye Movements, 657–768. Oxford University Press, 2015. http://dx.doi.org/10.1093/med/9780199969289.003.0011.

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This chapter reviews the approach to the patient with nystagmus or saccadic intrusions and their clinical features (with illustrative video cases), etiology, pathophysiology, and management. Nystagmus caused by peripheral vestibular disorders; downbeat, upbeat, and torsional nystagmus; periodic alternating nystagmus, seesaw and hemi-seesaw nystagmus; gaze-evoked nystagmus; Bruns nystagmus; centripetal and rebound nystagmus; nystagmus occurring in association with disease of the visual system; acquired pendular nystagmus with multiple sclerosis; oculopalatal tremor; convergence-retraction nystagmus; infantile nystagmus syndrome; fusional maldevelopment nystagmus syndrome and latent nystagmus; spasmus nutans syndrome; and lid nystagmus are discussed. Saccadic intrusions and oscillations and the clinical features, etiology, pathophysiology, and management of square-wave jerks, macrosaccadic oscillations, saccadic pulses, ocular flutter, opsoclonus, and voluntary saccadic oscillations are summarized. Treatments for nystagmus and saccadic intrusions are summarized, including pharmacological treatments, optical treatments, procedures to weaken the extraocular muscles (e.g., Kestenbaum-Anderson procedure), and measures such as biofeedback and vibration.
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"frequency of 100-200 Hz the beam is moved to and fro like a pendulum. The reason for this is that the material to be irradiated must, as nearly as possible, receive the same radiation dose in all its parts. The electron beam has a diameter of only a few millimeters or centimeters. Without scanning, the electron beam would concentrate the whole beam power on a very small area of the irradiated goods. By scanning the electron beam and simultaneously moving the material to be irradiated perpendicularly to the scanning line of the electron beam, an even distribution of radiation energy to the irradiated material can be achieved. It is very difficult to handle accelerating potentials higher than 5 MeV in DC accelerators, whereas linacs can produce electron energies even higher than the 10 MeV allowed for food irradiation. In a linac (Fig. 7), pulses or bunches of electrons produced at the thermionic cathode are accelerated in an evacuated tube by driving RF electromagnetic fields along the tube. The electrons ride on a traveling electromagnetic wave, comparable with a piece of wood or a surfer riding the crest of a water wave. The RF generator is designated high-power klystron tube in Figure 7. The electron beam leaving the accelerator tube can be scanned in the same way as for DC accelerators. Linac electrons are also monoenergetic, but the beam is pulsed rather than continuous. An electron pulse of a few micro-seconds duration may be followed by a dead time of a few milliseconds, with different manufacturers using different timings. When the dose rate provided by a pulsed electron beam is described, it is important to indicate whether this is the pulse dose rate or the overall dose rate of pulse plus dead time. Linac designs other than the traveling wave type described here are available (7). A number of linacs have been built specifically for food irradiation studies." In Safety of Irradiated Foods, 39. CRC Press, 1995. http://dx.doi.org/10.1201/9781482273168-30.

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Conference papers on the topic "Pendulum waves"

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Tokmakov, K. "Bi-filar pendulum mode Q factor for silicate bonded pendulum." In Third edoardo amaldi conference on gravitational waves. AIP, 2000. http://dx.doi.org/10.1063/1.1291908.

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Beilby, Mark A. "Development of a double pendulum for gravitational wave detectors." In Third edoardo amaldi conference on gravitational waves. AIP, 2000. http://dx.doi.org/10.1063/1.1291907.

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Garufi, Fabio, Massimo Bassan, Antonella Cavalleri, Martina De Laurentis, Fabrizio De Marchi, Rosario De Rosa, Luciano Di Fiore, et al. "PETER: a torsion pendulum facility to study small forces/torques on free falling instrumented masses." In Gravitational-waves Science&Technology Symposium. Trieste, Italy: Sissa Medialab, 2018. http://dx.doi.org/10.22323/1.325.0019.

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Dai, Xian-zhi. "A pendulum-type magnetoelectric vibration energy harvester with frequency-doubling characteristics." In 2015 Symposium on Piezoelectricity, Acoustic Waves, and Device Applications (SPAWDA). IEEE, 2015. http://dx.doi.org/10.1109/spawda.2015.7364466.

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Yerrapragada, Karthik, and M. Amin Karami. "Utilization of Nonlinear Resonance of Vessels for Ocean Wave Power Generation." In ASME 2015 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/detc2015-47706.

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This paper presents a method to utilize the pitch-roll nonlinear energy transfer phenomenon in vessels for off-shore wave power generation. This paper builds on an existing design where the power generator is a horizontal pendulum on board a vessel. The surface waves result in rocking of the ship, which in turn results in rotation of the pendulum. The pendulum is connected to a DC generator to produce power. The coupled electro-mechanical system is modeled using energy methods. The design in this paper utilizes the nonlinear coupling between the roll and pitch motions of the generator vessel. The natural frequency of the roll motion of the vessel is tuned to be twice the fundamental frequency of the pitch motion. In this specific condition when the vessel is excited in the pitch direction, the energy is nonlinearly transferred to the roll mode and the vessel oscillates in the roll direction. It is shown that the combination of the pitch as well as roll motion is far superior to the pitch motion since the combination results in full rotations of pendulum. A pendulum in full rotations generates orders of magnitude more power compared to a locally oscillating pendulum.
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MacCready, T., T. Zambrano, and B. D. Hibbs. "Generating Power From Ocean Waves Using a Float With Excessive Buoyancy: Theory and Dynamic Model Results." In ASME 2003 22nd International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2003. http://dx.doi.org/10.1115/omae2003-37059.

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We are exploring a new approach to ocean energy extraction through a device that we refer to as the NAF (an acronym for Non-Archimedean Float). The NAF is a fully submerged body with excess buoyancy; i.e., the mass of the body is far less than the mass of the water it displaces. When such a float is tethered beneath the ocean surface the buoyancy yields a large force vector in the direction perpendicular to the isobaric surfaces that parallel the water/air interface. The constant shifting of the wave troughs provides the opportunity for energy extraction using turbines affixed to the float. We are exploring the NAF concept because its simplicity results in many inherent benefits. The device has few moving parts, gathers energy from waves coming in any direction, and exists as a non-obtrusive, completely submerged installation. A numerical model of the NAF has been created to determine the dynamic behavior and power output for various configurations and under various wave conditions. The numerical model is set up to calculate the various forces experienced by the NAF float, and from these it calculates the velocity and position of the float through time series steps. The model effectively demonstrates which variables are important and how power output relates to NAF dimensions. One early finding from the model result relates to tuning the natural frequency of the NAF to match the natural frequency of the waves. The NAF moves like an inverted pendulum, and its natural frequency is primarily dependent on the length of the pendulum. Regardless of the actual float buoyancy, the 6 to 12 second periods that typify average wave conditions dictate that the NAF tether should be between 30-m and 60-m long. Also, a scale version of this novel energy device consisting of a float tethered beneath the ocean surface was deployed off the coast of southern California. The deployment yielded rich data sequences that are sufficient for comparison with a dynamic numerical model.
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Bandyopadhyay, Promode R. "Flying Fish Sculls to Taxi and Perturbs Wing Lift With Travelling Waves to Land." In ASME 2016 Fluids Engineering Division Summer Meeting collocated with the ASME 2016 Heat Transfer Summer Conference and the ASME 2016 14th International Conference on Nanochannels, Microchannels, and Minichannels. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/fedsm2016-7507.

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The top 200 meters of oceans abound in life forms since photosynthesis is possible in that layer. Competition and predator-prey (swordfish-flying fish, 102–104 to 1 mass ratio) interactions are intense here. Chased by predators, a flying fish (FF) — a pleuston — frantically escapes from the water and becomes airborne. Here we report the visual observations of oceanic surface and body distortions of FF to surmise the mechanisms of propulsion during taxiing and landing. FF leaps, not when it is chased, but when the additional energy required for further increase in speed underwater exceeds that required to leap.1 The higher metabolic cost of transport of regular flapping flight in air than in water is circumvented by gliding. We examine the BBCTV video2 by Richard Attenborough, the noted naturalist. An FF may camber its wings like parafoils and may also twist the outer half of the wings during taxiing and climbing. To produce thrust during taxiing, the FF sculls with the lower lobe of the tail fin to produce a reverse Karman vortex jet; there is rapid flicking of the lower lobe of the tail fin tangentially over the surface. The body acts as a chaotic damped and driven pendulum to produce the high-velocity wide flick. To damp after takeoff, it becomes a single asymmetric pendulum. Unpowered (foil) gliding follows. For descent, the wings are shaped, untwisted parafoils and, just prior to touchdown, travelling waves are superimposed, producing, in contrast to taxiing, an impressively smooth small-angle-of-attack tail touchdown on water without any nose-down. The spiked crowns of Richtmyer-Meshkov interface instability are visible on the ocean surface during leaping but not during landing. Trailing hydraulic jumps are observable during landing but not during leaping. The leap is a high-acceleration and Weber number dominated (inertia/capillary forces) phenomenon, but the landing involves little impact force and is dominated by Froude number forces (inertia/gravity forces). The evidence suggests that, prior to leaping and while still underwater, the FF reads the surface wind direction to align the flight path.
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Chandrasekaran, Srinivasan, Deepak Kumar, and Ranjani Ramanathan. "Response Control of TLP Using Tuned Mass Dampers." In ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-23597.

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Offshore tension leg platform (TLP) is a compliant type offshore structure where the tendons are deployed under initial pretension to counteract the excessive buoyancy. TLPs show large amplitude response under environmental loads due to their compliancy, which poses threat under extreme loads. Use of passive dampers like Tuned Mass Damper (TMD) is common to control such large amplitude motion, however their deployment in offshore structures is relatively new. Response control of a scaled model of TLP is attempted using tuned mass damper of pendulum type under regular waves. Based on the experimental studies carried out, it is seen that there is a significant reduction in the surge response under the folded pendulum type damper. Results also show that there is a reduction in the heave response due to the control envisaged in the surge motion. The discussed method of response control is one of the effective methods of retrofitting offshore platforms whose operability at rough sea states is a serious concern.
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Zhuravlev, V., S. Perelyaev, and D. Borodulin. "The Generalized Foucault Pendulum is a 3D Integrating Gyroscopes Using the Three-Dimensional Precession of Standing Waves in a Rotating Spherically Symmetric Elastic Solid." In 2019 DGON Inertial Sensors and Systems (ISS). IEEE, 2019. http://dx.doi.org/10.1109/iss46986.2019.8943687.

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10

Fonseca, Ícaro A., Felipe F. de Oliveira, and Henrique M. Gaspar. "Virtual Prototyping and Simulation of Multibody Marine Operations Using Web-Based Technologies." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96051.

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Abstract This paper focuses on virtual prototyping and simulation of marine operations based on web technologies. The ship is represented as a digital object, which can be used to perform different types of analyses and simulations. The presented simulations are: motion of a single hull and of multiple hulls in regular waves calculated with closed-form expressions, induced pendulum motion response to a lifted load, and motion of a barge with initial movements in still water calculated with equations of motion. The simulations are developed as web applications in JavaScript and HTML, with graphical user interfaces and 3D renders of the operations. Relevant parameters of the simulations such as wave characteristics and design dimensions are linked to interactive dashboards, allowing the user to modify them and visualize the results in real-time. The applications are lightweight enough to be executed locally in the web browser of most modern devices. The work employs an open source approach, relying most notably on the Vessel.js library. This aims to foster reuse of models and collaboration with external contributors.
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