Gotowe bibliografie tematyczne / Surface mode oscillations

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Gotowa bibliografia na temat „Surface mode oscillations”

Autor: Grafiati

Data publikacji: 6 września 2023

Data aktualizacji: 19 lipca 2025

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Artykuły w czasopismach na temat "Surface mode oscillations"

Klimov, Alexandr V., and Akop V. Antonyan. "Research of features of oscillating process’ behavior in the nonlinear system of individual traction drive of an electrobus." Izvestiya MGTU MAMI 17, no. 1 (2023): 87–96. http://dx.doi.org/10.17816/2074-0530-115233.

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BACKGROUND: When a vehicle is in motion, self-oscillations which properties are dependent on slip rate in a contact patch may occur in the area of tire interaction with ground surface. Oscillations frequency will vary in dependence with value of wheel slip relative to ground surface. Soft self-oscillations are excited by variable set of initial conditions at full slip in traction and driven wheel rolling modes as well as in mixed braking mode with partial slip. Hard mode of self-oscillations occurs at full wheel slip in braking mode. These processes have a negative impact on the processes in e

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Kuzmychov, I., O. Lukash, O. Senkevych, and O. Gribovsky. "SURFACE OSCILLATIONS IN OPEN RESONATORS WITH CURVILINEAR REFLECTORS." Radio physics and radio astronomy 30, no. 1 (2025): 065–73. https://doi.org/10.15407/rpra30.01.065.

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Subject and Purpose. The subject of the work is the behavior of "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors embedded in the waveguide transmission line. We seek to determine physical patterns and features of the interaction between volume "bouncing ball" oscillations and surface oscillations in open resonant systems with curvilinear reflectors. Methods and Methodology. Basic quasi-optical techniques were employed. The electric field structures of considered oscillation types were measured using the probe-induced perturbation method

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Zhileykin, Mikhail M., Pavel V. Sirotin, Sergey S. Nosikov, and Nikolay N. Pulyaev. "Method for detecting the loss of stability of the movement of tractors when towing a trailer or a coupled unit." Tractors and Agricultural Machinery 90, no. 1 (2023): 39–48. http://dx.doi.org/10.17816/0321-4443-321266.

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BACKGROUND:Currently, combines and tractors, being the most energy-intensive transport and technological machines for agricultural purposes, largely determine the possibility of transition to an efficient and environmentally friendly agricultural economy, and also provide the technical aspect of the transformation of the agro-industrial complex into the leading sector of the countrys industry. One of the sources of dynamic loads in the units and subsystems of tractor equipment are self-oscillating modes. AIMS:Study of the conditions for the occurrence of self-oscillating processes in the

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H Thomas, John. "Oscillations in Sunspots." Australian Journal of Physics 38, no. 6 (1985): 811. http://dx.doi.org/10.1071/ph850811.

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Recent observational and theoretical work on oscillations in sunspots is reviewed. The characteristic 3-minute umbral oscillations and flashes are reSonant modes of the sunspot itself, whereas the 5-minute oscillations in the umbra are a passive response to forcing by p modes in the surrounding convection zone. The observational evidence suggests that the fundamental cause of the 3-minute oscillations is the photospheric fast-mode resonance, with chromospheric slow-mode resonances perhaps producing additional oscillation frequencies in the chromosphere. Observations and theoretical models of t

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Mitura, Z., S. L. Dudarev, and M. J. Whelan. "Theoretical Investigations of RHEED Oscillations." Microscopy and Microanalysis 5, S2 (1999): 710–11. http://dx.doi.org/10.1017/s1431927600016871.

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Nowadays there is great interest in the application of reflection high energy electron diffraction (RHEED) to monitor the growth of ultra thin films. This popularity of RHEED arose from the discovery of RHEED intensity oscillations in the early eighties. Namely, it was experimentally found that if the growth of a material follows a layer-by-layer mode then regular oscillating changes in the intensity of the specular beam occur, and the period of the oscillations corresponds to the deposition of one atomic layer of the material. These findings are of great practical importance and consequently

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Liu, Yunqiao, and Benlong Wang. "Dynamics and surface stability of a cylindrical cavitation bubble in a rectilinear vortex." Journal of Fluid Mechanics 865 (March 1, 2019): 963–92. http://dx.doi.org/10.1017/jfm.2019.103.

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In this paper, we formulate the dynamic equations of radial and surface modes for a cylindrical cavitation bubble subject to a prescribed uniform rectilinear vortex flow. The potential flow in the bulk volume of the external flow is modelled using the general mode decomposition approach. The stability of surface modes is investigated under linear analysis. The effects of confinement due to a limited flow domain in a water tunnel and viscosity at the bubble surface are evaluated, which can be fairly neglected for the cylindrical cavitation bubbles discussed. Our model is capable of predicting t

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Wang, Minyang, Shang-Ping Xie, Samuel S. P. Shen, and Yan Du. "Rossby and Yanai Modes of Tropical Instability Waves in the Equatorial Pacific Ocean and a Diagnostic Model for Surface Currents." Journal of Physical Oceanography 50, no. 10 (2020): 3009–24. http://dx.doi.org/10.1175/jpo-d-20-0063.1.

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AbstractMesoscale activities over the equatorial Pacific Ocean are dominated by the Rossby and Yanai modes of tropical instability waves (TIWs). The TIW-induced surface velocity has not been accurately estimated in previous diagnostic models, especially for the meridional component across the equator. This study develops a diagnostic model that retains the acceleration terms to estimate the TIW surface velocity from the satellite-observed sea surface height. Validated against moored observations, the velocity across the equator is accurately estimated for the first time, much improved from exi

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Ignatyev, Alexander Anatolevich, Irina Pavlovna Nasad, and Tat'yana Gennadievna Nasad. "Modeling lathe dynamic system in terms of estimated dampening coefficient of autocorrelation function of oscillations." Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics 2023, no. 2 (2023): 17–22. http://dx.doi.org/10.24143/2072-9502-2023-2-17-22.

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Part machining on the lathes with automated tools is a complex process that depends on the properties  of the lathe dynamic system. Oscillations in processing the main parts determine the dynamic quality of the lathes, quality of the surface layer and resistance of the cutting tool, therefore, it is necessary to identify the methods to control the operation mode. Increased efficiency of the process is provided by the forced cutting modes, which can lead to the deterioration of processing quality and premature wear of a cutting tool. Theoretical definition of rational cutting modes causes

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Strohmayer, T. E. "Oscillations of Rotating Neutron Stars." International Astronomical Union Colloquium 128 (1992): 299–304. http://dx.doi.org/10.1017/s0002731600155386.

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AbstractWe use a perturbation technique to compute the rotational corrections to the non-radial oscillation spectrum of a realistic neutron-star model. We compute, to first order in the rotation rate, the corrections to the normal mode eigenfrequencies and eigenfunctions. We find that l = l0 oscillations are coupled to l = l0 ± 1 oscillations by the Coriolis force. For the toroidal modes, this coupling introduces a non-zero radial component to the velocity field. We have used this result to compute the neutrino damping rates for several corrected toroidal modes. This damping mechanism is inope

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MacLeod, Morgan, Michelle Vick, and Abraham Loeb. "Tidal Wave Breaking in the Eccentric Lead-in to Mass Transfer and Common Envelope Phases." Astrophysical Journal 937, no. 1 (2022): 37. http://dx.doi.org/10.3847/1538-4357/ac8aff.

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Abstract The evolution of many close binary and multiple star systems is defined by phases of mass exchange and interaction. As these systems evolve into contact, tidal dissipation is not always sufficient to bring them into circular, synchronous orbits. In these cases, encounters of increasing strength occur while the orbit remains eccentric. This paper focuses on the outcomes of close tidal passages in eccentric orbits. Close eccentric passages excite dynamical oscillations about the stars’ equilibrium configurations. These tidal oscillations arise from the transfer of orbital energy into os

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Rozprawy doktorskie na temat "Surface mode oscillations"

Cleve, Sarah. "Microstreaming induced in the vicinity of an acoustically excited, nonspherically oscillating microbubble." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC028/document.

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Des bulles micrométriques sont utilisées dans divers domaines, notamment dans des applications médicales basées sur les ultrasons. Il est possible d’exploiter différents effets des bulles, comme par exemple leur résonance acoustique ou leur effet destructeur en cavitation inertielle. Un autre mécanisme exploitable est la génération de micro-écoulements, appelé microstreaming, induits autour d’une bulle. Ces écoulements sont relativement lents par rapport aux oscillations rapides de la bulle. Le microstreaming et les contraintes de cisaillement associées jouent un rôle important dans la perméab

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Chen, Chia-Jeng. "Hydro-climatic forecasting using sea surface temperatures." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/48974.

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A key determinant of atmospheric circulation patterns and regional climatic conditions is sea surface temperature (SST). This has been the motivation for the development of various teleconnection methods aiming to forecast hydro-climatic variables. Among such methods are linear projections based on teleconnection gross indices (such as the ENSO, IOD, and NAO) or leading empirical orthogonal functions (EOFs). However, these methods deteriorate drastically if the predefined indices or EOFs cannot account for climatic variability in the region of interest. This study introduces a new hydro-climat

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Achlan, Moustafa. "Surface Plasmon Polariton and Wave Guide Modes in a Six Layer Thin Film Stack." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLS109.

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Dans cette thèse, nous étudions les propriétés optiques d'un système multicouche (air-Au-SiO₂-Au-Ti-verre). Les interfaces sont planes et la modélisation est réalisée en utilisant les coefficients de Fresnel à l'interface et la propagation d'ondes planes dans les couches. Deux modèles sont utilisés où l'échantillon est : i) excité par une source à l'infini ; ii) excité par une source locale. Dans l'expérience que nous avons modélisée l'empilement est excité par les électrons tunnel inélastiques dans un microscope à effet tunnel (STM). Dans le modèle, le courant tunnel inélastique est remplacé

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Chen, Lihui. "Synthesis and Plasmonic Properties of Copper-based Nanocrystals." 京都大学 (Kyoto University), 2016. http://hdl.handle.net/2433/217134.

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Maliniemi, V. (Ville). "Observations of solar wind related climate effects in the Northern Hemisphere winter." Doctoral thesis, University of Oulu, 2016. http://urn.fi/urn:isbn:9789526213545.

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Abstract This thesis studies the long-term relation between the solar wind driven energetic particle forcing into the atmosphere and the tropospheric circulation in the Northern Hemisphere winter. The work covers the period of more than one hundred years since the turn of the 20th century to present. The thesis makes a statistical analysis of satellite measurements of precipitating energetic electrons, sunspot number data and geomagnetic activity, and compares them with temperature and pressure measurements made at the Earth's surface. Recent results, both observational and from chemistry clim

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Awo, Founi Mesmin. "Modes interannnuels de la variabilité climatique de l'Atlantique tropical, dynamiques oscillatoires et signatures en salinité de surface de la mer." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30171/document.

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Dans cette thèse, nous avons abordé plusieurs thématiques liées aux modes de variabilité climatique dans l'Atlantique tropical à l'échelle interannuelle. Les analyses statistiques nous ont permis dans un premier temps de mettre en évidence les deux principaux modes dominants de cette variabilité interannuelle: un mode équatorial et un mode méridien. Le mode équatorial est responsable d'anomalies de température de surface de la mer (SST) principalement dans le Golfe de Guinée et est identifié par des variations de la pente du niveau de la mer dans la bande équatoriale. Il est dû à des rétroacti

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Ayina, Ludos-Hervé. "Etude des modes de variabilité de l'océan Atlantique tropical et de leur sensibilité à l'impact des décharges fluviatiles et des précipitations." Paris 6, 2002. http://www.theses.fr/2002PA066019.

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Thakore, Vaibhav. "Nonlinear dynamic modeling, simulation and characterization of the mesoscale neuron-electrode interface." Doctoral diss., University of Central Florida, 2012. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5529.

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Extracellular neuroelectronic interfacing has important applications in the fields of neural prosthetics, biological computation and whole-cell biosensing for drug screening and toxin detection. While the field of neuroelectronic interfacing holds great promise, the recording of high-fidelity signals from extracellular devices has long suffered from the problem of low signal-to-noise ratios and changes in signal shapes due to the presence of highly dispersive dielectric medium in the neuron-microelectrode cleft. This has made it difficult to correlate the extracellularly recorded signals with

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Rath, Pranaya Kishore. "Experimental Investigation of Electrons In and Above Liquid Helium." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5838.

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Electrons on the surface of liquid helium form a nearly ideal 2-dimensional electron system (2DES). An electron density up to 2 × 10^9 cm-2, known as the critical electron density, can be achieved on the liquid helium surface, above which an electro-hydrodynamic (EHD) instability sets in, which results in the formation of MEBs. Due to this limitation in maximum possible density, only the classical liquid and solid phases of the 2DES can be accessed in this system. But at the same time, on the surface of thin liquid helium film and with the multi-electron bubbles (MEBs), it may be possible to

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Das, Surajit. "Role Of Sea Surface Temperature Gradient In Intraseasonal Oscillation Of Convection In An Aquaplanet Model." Thesis, 2012. https://etd.iisc.ac.in/handle/2005/2583.

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In this thesis we examine intra-seasonal oscillations (ISO) in the aqua-planet setup of the Community Atmospheric Model (CAM) version 5.1, mainly based on July and January climatological sea surface temperature (SST). We investigate mainly two questions -what should be the SST distribution for the existence of (a) northward moving ISO in summer, and (b) eastward moving MJO-like modes in winter. In the first part of the thesis we discuss the northward propagation. A series of experiments were performed with zonally symmetric and asymmetric SST distributions. The basic lower boundary condition i

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Książki na temat "Surface mode oscillations"

Mann, Peter. Near-Equilibrium Oscillations. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198822370.003.0012.

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In this chapter, the theory of near-equilibrium oscillations is developed and normal mode analysis is performed. This topic requires a little bit of linear algebra when dealing with matrices, as well as an understanding of differential equations. The chapter explores small perturbations (small nudges or tiny shifts) to a stable equilibrium point in configuration space and introduces the characteristic equation. Interdisciplinary examples are then investigated, including a surface science example in which the bond frequencies of surface adsorbates are calculated, an example in which the motion

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Yang, Kun. Observed Regional Climate Change in Tibet over the Last Decades. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.587.

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The Tibetan Plateau (TP) is subjected to strong interactions among the atmosphere, hydrosphere, cryosphere, and biosphere. The Plateau exerts huge thermal forcing on the mid-troposphere over the mid-latitude of the Northern Hemisphere during spring and summer. This region also contains the headwaters of major rivers in Asia and provides a large portion of the water resources used for economic activities in adjacent regions. Since the beginning of the 1980s, the TP has undergone evident climate changes, with overall surface air warming and moistening, solar dimming, and decrease in wind speed.

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Horing, Norman J. Morgenstern. Random Phase Approximation Plasma Phenomenology, Semiclassical and Hydrodynamic Models; Electrodynamics. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198791942.003.0010.

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Chapter 10 reviews both homogeneous and inhomogeneous quantum plasma dielectric response phenomenology starting with the RPA polarizability ring diagram in terms of thermal Green’s functions, also energy eigenfunctions. The homogeneous dynamic, non-local inverse dielectric screening functions (K) are exhibited for 3D, 2D, and 1D, encompassing the non-local plasmon spectra and static shielding (e.g. Friedel oscillations and Debye-Thomas-Fermi shielding). The role of a quantizing magnetic field in K is reviewed. Analytically simpler models are described: the semiclassical and classical limits an

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Goswami, B. N., and Soumi Chakravorty. Dynamics of the Indian Summer Monsoon Climate. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.613.

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Lifeline for about one-sixth of the world’s population in the subcontinent, the Indian summer monsoon (ISM) is an integral part of the annual cycle of the winds (reversal of winds with seasons), coupled with a strong annual cycle of precipitation (wet summer and dry winter). For over a century, high socioeconomic impacts of ISM rainfall (ISMR) in the region have driven scientists to attempt to predict the year-to-year variations of ISM rainfall. A remarkably stable phenomenon, making its appearance every year without fail, the ISM climate exhibits a rather small year-to-year variation (the sta

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Nédélec, Anne. Earth and Life. Oxford University PressOxford, 2025. https://doi.org/10.1093/9780198945444.001.0001.

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Abstract The book provides a whole history of the Earth since the formation of the solar system. It describes the oldest rocks and minerals, and explains the main geological processes in a way understandable to everyone. The ancient Earth was very different from the current one, with very little emerged land area and no oxygen. Life appeared in the abyss, likely near hydrothermal oceanic vents. For more than two billion years, living beings were just simple marine microorganisms—bacteria or archea. Though basic, these were responsible for the oxygenation of the ocean and the atmosphere. Not al

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Hameed, Saji N. The Indian Ocean Dipole. Oxford University Press, 2018. http://dx.doi.org/10.1093/acrefore/9780190228620.013.619.

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Discovered at the very end of the 20th century, the Indian Ocean Dipole (IOD) is a mode of natural climate variability that arises out of coupled ocean–atmosphere interaction in the Indian Ocean. It is associated with some of the largest changes of ocean–atmosphere state over the equatorial Indian Ocean on interannual time scales. IOD variability is prominent during the boreal summer and fall seasons, with its maximum intensity developing at the end of the boreal-fall season. Between the peaks of its negative and positive phases, IOD manifests a markedly zonal see-saw in anomalous sea surface

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Kucharski, Fred, and Muhammad Adnan Abid. Interannual Variability of the Indian Monsoon and Its Link to ENSO. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.615.

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The interannual variability of Indian summer monsoon is probably one of the most intensively studied phenomena in the research area of climate variability. This is because even relatively small variations of about 10% to 20% from the mean rainfall may have dramatic consequences for regional agricultural production. Forecasting such variations months in advance could help agricultural planning substantially. Unfortunately, a perfect forecast of Indian monsoon variations, like any other regional climate variations, is impossible in a long-term prediction (that is, more than 2 weeks or so in adva

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Nash, David. Changes in Precipitation Over Southern Africa During Recent Centuries. Oxford University Press, 2017. http://dx.doi.org/10.1093/acrefore/9780190228620.013.539.

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Precipitation levels in southern Africa exhibit a marked east–west gradient and are characterized by strong seasonality and high interannual variability. Much of the mainland south of 15°S exhibits a semiarid to dry subhumid climate. More than 66 percent of rainfall in the extreme southwest of the subcontinent occurs between April and September. Rainfall in this region—termed the winter rainfall zone (WRZ)—is most commonly associated with the passage of midlatitude frontal systems embedded in the austral westerlies. In contrast, more than 66 percent of mean annual precipitation over much of th

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Stańczykiewicz, Arkadiusz. Prawdopodobieństwo wystąpienia szkód w odnowieniach podokapowych wskutek pozyskiwania drewna oraz model ich szacowania. Publishing House of the University of Agriculture in Krakow, 2018. http://dx.doi.org/10.15576/978-83-66602-34-2.

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An analysis of the existing literature on the issue of damage to regeneration caused by timber harvesting, revealed that a great majority of results reported in those publications was obtained through laborious and time-consuming field research conducted in two stages. Field research methods for gathering data, employed by various authors, differed in terms of the manner of establishing trial plots, the accuracy of counting and evaluating the number of saplings growing on the investigated sites, classification systems used for distinguishing particular groups of regeneration based on quantitat

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Części książek na temat "Surface mode oscillations"

Shaw, Stephen J. "Surface mode deformations on an oscillating bubble." In Fluid Mechanics and Its Applications. Springer Netherlands, 1994. http://dx.doi.org/10.1007/978-94-011-0938-3_33.

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Glampedakis, Kostas, Lars Samuelsson, and Nils Andersson. "A toy model for global magnetar oscillation." In Isolated Neutron Stars: From the Surface to the Interior. Springer Netherlands, 2007. http://dx.doi.org/10.1007/978-1-4020-5998-8_84.

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Jian, Lijun, Xiao Zeng, and Jie Pei. "The Potential Force Interface Tension Model in MPS Method for Stratification Simulation." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_27.

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AbstractIn the analysis of phenomenology of serious accident, stratification behavior is important in the late in-vessel stage of core melt. Traditional numerical methods have difficulties in analyzing stratification process accompanying with free surface, which need extra processes such as empirical correlations. The Moving Particle Semi-implicit (MPS) method has a natural advantage in calculating multiphase flows with free surface. In this paper, we apply the potential force surface tension model to the MPS program and extend the original surface tension model to the interface tension calculation of multiple flows. The improved MPS method is verified by a classical dam break problem. The surface tension model is verified by the cases of droplet oscillation, droplet on solid wall and floating droplet. Finally, the two-dimensional dam-break stratification experiment of silicone oil and salt water is simulated, and the simulation results agree with the experiment.

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Holm, Darryl D., Ruiao Hu, and Oliver D. Street. "Coupling of Waves to Sea Surface Currents Via Horizontal Density Gradients." In Mathematics of Planet Earth. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-18988-3_8.

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AbstractThe mathematical models and numerical simulations reported here are motivated by satellite observations of horizontal gradients of sea surface temperature and salinity that are closely coordinated with the slowly varying envelope of the rapidly oscillating waves. This coordination of gradients of fluid material properties with wave envelopes tends to occur when strong horizontal buoyancy gradients are present. The nonlinear models of this coordinated movement presented here may provide future opportunities for the optimal design of satellite imagery that could simultaneously capture the dynamics of both waves and currents directly.The model derived here appears in two levels of approximation: first for rapidly oscillating waves, and then for their slowly varying envelope (SVE) approximation obtained by using the WKB approach. The WKB wave-current-buoyancy interaction model derived here for a free surface with significant horizontal buoyancy gradients indicates that the mechanism for the emergence of these correlations is the ponderomotive force of the slowly varying envelope of rapidly oscillating waves acting on the surface currents via the horizontal buoyancy gradient. In this model, the buoyancy gradient appears explicitly in the WKB wave momentum, which in turn generates density-weighted potential vorticity whenever the buoyancy gradient is not aligned with the wave-envelope gradient.

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Alper, Said Emre, and Tayfun Akin. "A Symmetric Surface Micromachined Gyroscope with Decoupled Oscillation Modes." In Transducers ’01 Eurosensors XV. Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-59497-7_108.

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Lebreton, Y., G. Berthomieu, and J. Provost. "A Solar Model With Turbulent Diffusion Mixing: Surface Abundances And Oscillations." In Advances in Helio- and Asteroseismology. Springer Netherlands, 1988. http://dx.doi.org/10.1007/978-94-009-4009-3_20.

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Gjonaj, Erion, Yun Ouedraogo, and Sebastian Schöps. "Modelling of Droplet Dynamics in Strong Electric Fields." In Fluid Mechanics and Its Applications. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-09008-0_6.

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AbstractWe describe a modelling approach for the simulation of droplet dynamics in strong electric fields. The model accounts for electroquasistatic fields, convective and conductive currents, contact angle dynamics and charging effects associated with droplet breakup processes. Two classes of applications are considered. The first refers to the problem of water droplet oscillations on the surface of outdoor high-voltage insulators. The contact angle characteristics resulting from this analysis provides a measure for the estimation of the electric field inception thresholds for electrical discharges on the surface. The second class of applications consists in the numerical characterization of electrosprays. Detailed simulations confirm the scaling law for the first electrospray ejection and, furthermore, provide insight on the charge-radius characteristics for transient as well as steady state electrosprays.

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Stępień, Jan, and Janusz Stafiej. "Potential Oscillations in Cellular Automaton Based Model for Passivation of Metal Surface." In Developments in Language Theory. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99813-8_8.

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Matsunami, Koji, Kyoji Sassa, Loi Doan, Ranjan Weerasinghe, and Tania Munasinghe. "Observation of Seismic Ground Motion and Pore Water Pressure in Lineated Valley Fill of Wakayama, Southwest Japan." In Progress in Landslide Research and Technology, Volume 3 Issue 1, 2024. Springer Nature Switzerland, 2024. http://dx.doi.org/10.1007/978-3-031-55120-8_3.

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AbstractWe performed in-situ observations of seismic ground motion, pore-water pressure, and ground-water level at lineated valley fill (LVF) in Wakayama city, southwest Japan, from 2004 to 2008. In Wakayama city and its surrounding area, felt earthquakes often occur with epicenters in the northwestern part of the Kii Peninsula and the Nankai Trough off the coast of the Kii Peninsula. We obtained simultaneous observation records of surface ground motion and pore-water pressure from several small- to medium-sized earthquakes. The excess pore-water pressure was clearly observed during a medium-sized earthquake with magnitude Mj 4.5. From the detailed analysis of surface ground motion, we detected a long-period pulse, although it was usually hidden behind oscillating short-period components with large amplitudes. The strong shaking induced ground tilting motion, causing a step-like acceleration change in the seismometer pendulum. Although no ground deformation could be confirmed through visual observation during the earthquake, the in-situ instrumental observation revealed ground tilting motion. Theoretical long-period pulses were synthesized assuming models of ground tilting motion during an earthquake. From comparison of the theoretical model with the observed long-period pulse, the permanent tilt is of an order of 10−6 degree down nearly toward the direction of the valley line.

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Garrett, Steven L. "Attenuation of Sound." In Understanding Acoustics. Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-44787-8_14.

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Abstract We will capitalize on our understanding of thermoviscous loss to develop an understanding of the attenuation of sound waves in fluids that are not influenced by proximity to solid surfaces. Such dissipation mechanisms are particularly important at very high frequencies and short distances (for ultrasound) or very low frequencies over geological distances (for infrasound). The Standard Linear Model of viscoelasticity introduced the nondimensional frequency, ωτR, that controlled the medium’s elastic (in-phase) and dissipative (quadrature) responses. Those response curves were “universal” in the sense that causality linked the elastic and dissipative responses through the Kramers-Kronig relations. That relaxation-time perspective is essential for attenuation of sound in media that can be characterized by one or more relaxation times related to those internal degrees of freedom that make their equation of state a function of frequency. Examples of these relaxation-time effects include the rate of collisions between different molecular species in a gas (e.g., nitrogen and water vapor in air), the pressure dependence of ionic association-dissociation of dissolved salts in sea water (e.g., MgSO4 and H3BO3), and evaporation-condensation effects when a fluid is oscillating about equilibrium with its vapor (e.g., fog droplets in air or gas bubbles in liquids).

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Streszczenia konferencji na temat "Surface mode oscillations"

Smith, Elizabeth T., William W. Schultz, and Elijah Kannatey-Asibu. "Modeling Oscillations During Conduction Mode Laser Welding." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0725.

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Abstract Thermal, optical, and acoustic signals are generated during laser welding by the many physical phenomena which govern the laser beam-material interactions involved in welding. The objective of this study is to analyze one potential source of these signals — oscillations of the molten weld pool. Weld pool oscillations are modeled as gravity-capillary waves in a partially penetrating, conduction mode weld pool. The weld pool is assumed to be stationary and cylindrical, containing inviscid, incompressible, irrotational liquid metal. Dynamic and kinematic boundary conditions are imposed a

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Mahjoub, Mohamed, Ngoc-Ha Dao, Khac-Long Nguyen, and Stéphane Menand. "Combining Downhole Axial and Surface Oscillation Tools, What Are the Consequences on Tool Face Control Performance?" In IADC/SPE International Drilling Conference and Exhibition. SPE, 2022. http://dx.doi.org/10.2118/208708-ms.

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Abstract When drilling in sliding mode, axial oscillation tools (AOT) and surface oscillation tools (SOT) are two possible solutions that are used in the industry to overcome the friction forces, especially in unconventional well trajectories with a long lateral section. The AOT is assembled in the drillstring and run in hole such that it is generally placed in the middle of the lateral section. It is actuated by the mud flow to produce high-frequency axial vibrations. As for the SOT, it is placed at surface and produces low-frequency torsional oscillations in the drillstring by alternating th

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Mortazavi, Mehdi, and Taylor Pedley. "Dynamics of Droplets in Core Gas Flow Superimposed With Acoustic Pressure Waves." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-72011.

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Abstract During the operation of a proton exchange membrane fuel cell, water is produced in the cathode electrode. Accumulation of produced water in the flow channel can block the transport of reactants, which ultimately lowers the performance of the cell. The water content in the flow channel can be efficiently removed from the channel with an external excitation. Previously, the author reported utilization of acoustic pressure waves in order to remove the water content from the flow channel [1]. However, the dynamics of liquid water droplets during this removal process were not investigated.

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Schro¨der, J. J., and S. Alraun. "An Extra Mode of Enhanced Heat Transfer by Oscillating Bubbles in Minichannels and Microchannels." In ASME 2003 1st International Conference on Microchannels and Minichannels. ASMEDC, 2003. http://dx.doi.org/10.1115/icmm2003-1083.

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Experimental investigations on heat transfer in tubular micro- or minichannel arrangements more often report on two-phase flow instabilities, pulsations or oscillations, which result in a remarkable influence on heat transfer efficiency. In order to explain the piston-like oscillations of the steam-plugs and water-slugs (-columns), the authors studied the somehow similar process which occurs in the worldwide known toy steam boat. Experiments have been performed which used a demonstration plant made of glass. By controlled electrical heating, high-speed video, pressure and local temperature mea

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Lakis, A. A., and S. Neagu. "Free Surface Effects on the Dynamics of Cylindrical Shells Partially Filled With Liquid." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-0102.

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Abstract This paper presents an analytical model for the dynamic analysis of thin cylindrical shells partially filled with liquid. The method used is a combination of finite element analysis and classical shell theory, and the objective is to determine the specific displacement functions which best represent the real deformations. The effect of oscillations of the free surface of the liquid on fluid-shell vibration is studied, and consideration is given to the influence of such parameters as: the circumferential mode, the axial mode, the structural damping, the length of the shell and the forc

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Zagitov, R. A., N. V. Shuvaev, A. N. Dushko, and Yu N. Shmotin. "Numerical Simulation of Unsteady Flow Around Oscillating Blade." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-69458.

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The paper is pointed to the problem of numerical simulation of unsteady flow around an oscillating blade in jet engine compressor. Single compressor rotor blade row is considered. It is assumed that mode shape and frequency of blade oscillation is not influenced by airflow. The system of governing equations is transformed to a moving coordinate system to describe blade oscillations. Multi-block structured “H-O” grid is used for spatial discretization. Inner boundary of “O”-grid (representing blade airfoil surface) is moved to describe blade airfoil oscillation. To minimize discretization error

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Buffum, Daniel H., and Sanford Fleeter. "The Aerodynamics of an Oscillating Cascade in a Compressible Flow Field." In ASME 1989 International Gas Turbine and Aeroengine Congress and Exposition. American Society of Mechanical Engineers, 1989. http://dx.doi.org/10.1115/89-gt-271.

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Fundamental experiments are performed in the NASA Lewis Research Center Transonic Oscillating Cascade Facility to investigate and quantify the aerodynamics of a cascade of biconvex airfoils executing torsion mode oscillations at realistic reduced frequency values. Both steady and unsteady airfoil surface pressures are measured at two inlet Mach numbers, 0.65 and 0.80, and two incidence angles, 0 and 7 degrees, with the harmonic torsional airfoil cascade oscillations at realistic high reduced frequency and unsteady data obtained at several interblade phase angle values. The time-variant pressur

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Rhee, J. K., T. B. Norris, Y. Arakawa, M. Nishioka, and C. Weisbuch. "Dynamics of Coherently Excited Semiconductor Microcavities." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1994. http://dx.doi.org/10.1364/up.1994.tue.5.

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Recently, cavity quantum electrodynamic (QED) effects in semiconductor microcavities have been of considerable interest since, in the weak-coupling regime they play an important role in selectively increasing spontaneous emission into the lasing mode of vertical-cavity surface-emitting lasers (VCSEL’s) [1,2], enabling low-threshold, high speed, and high efficiency. In a strong-coupling regime, the normal modes of the coupled system are superpositions of the exciton and cavity modes. Hence the impulsively excited system will evolve in time with the energy oscillating between the exciton and cav

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Zhao, Xiaopeng, and Harry Dankowicz. "Characterization of Intermittent Contact in Tapping Mode Atomic Force Microscopy." In ASME 2005 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/detc2005-84741.

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Tapping-mode atomic force microscopy has wide applications for probing the nanoscale surface and subsurface properties of numerous materials in a variety of environments. Strongly nonlinear effects due to large variations in the force field on the probe tip over very small length scales and the intermittency of contact with the sample, however, result in strong dynamical instabilities. These can result in a sudden loss of stability of low-contact-velocity oscillations of the atomic-force-microscope tip in favor of oscillations with high contact velocity, coexistence of stable oscillatory motio

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Koch, M., J. Shah, H. Wang, T. C. Damen, J. E. Cunningham, and W. Y. Jan. "Ultrafast oscillations in the optical emission from a semiconductor microcavity." In International Conference on Ultrafast Phenomena. Optica Publishing Group, 1996. http://dx.doi.org/10.1364/up.1996.thb.2.

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We report here the first investigation of femtosecond time-resolved emission from a semiconductor microcavity resonantly excited with intense femtosecond pulses. The emission intensity, which exhibits a strong threshold behavior, shows novel, well-pronounced oscillations that have a period of 600 fs and that last for several picoseconds. These THz oscillations can be associated with the appearance of a new mode in the spectrum and become more pronounced with pump intensify. The frequency of these oscillations is 20 times higher than those reported previously [1]. Our investigation probes novel

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Raporty organizacyjne na temat "Surface mode oscillations"

Brown, Dustin, Matthew Hiett, Samantha Cook, Dylan Pasley, Melissa Pham, and Sandra LeGrand. Rotorcraft Resupply Site Selection (RRSS) v1.0 and the USACE Model Interface Platform (UMIP) : documentation and user’s guide. Engineer Research and Development Center (U.S.), 2023. http://dx.doi.org/10.21079/11681/47908.

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This research effort aimed to create an operational prototype of the Geomorphic Oscillation Assessment Tool (GOAT) v1.0, developed by the US Army Engineer Research and Development Center, as a part of the US Army Corps of Engineers’ Model Interface Platform (UMIP). This platform is a web-based software that allows for easy and rapid construction and deployment of spatial planning and analysis capabilities. The prototype tool in UMIP represents the science embedded in GOAT while providing a user-friendly interface for interaction and spatially referenced result viewing. It also includes user ac

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Yeates, Elissa, Kayla Cotterman, and Angela Rhodes. Hydrologic impacts on human health : El Niño Southern Oscillation and cholera. Engineer Research and Development Center (U.S.), 2020. http://dx.doi.org/10.21079/11681/39483.

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A non-stationary climate imposes considerable challenges regarding potential public health concerns. The El Niño Southern Oscillation (ENSO) cycle, which occurs every 2 to 7 years, correlates positively with occurrences of the waterborne disease cholera. The warm sea surface temperatures and extreme weather associated with ENSO create optimal conditions for breeding the Vibrio cholerae pathogen and for human exposure to the pathogenic waters. This work explored the impacts of ENSO on cholera occurrence rates over the past 50 years by examining annual rates of suspected cholera cases per countr

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