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Academic literature on the topic 'Ghost waves'

Author: Grafiati
Published: 10 December 2022
Last updated: 28 January 2023

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Journal articles on the topic "Ghost waves"

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Mackay, Tom G., and Akhlesh Lakhtakia. "Exorcizing ghost waves." Optik 192 (September 2019): 162926. http://dx.doi.org/10.1016/j.ijleo.2019.06.026.

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Robertsson, Johan O. A., Dirk-Jan van Manen, Fredrik Andersson, Lasse Amundsen, and Kurt Eggenberger. "Source deghosting by depth apparition." GEOPHYSICS 82, no. 6 (November 1, 2017): P89—P107. http://dx.doi.org/10.1190/geo2016-0686.1.

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Marine seismic data are distorted by ghosts as waves propagating upward reflect downward from the sea surface. Ghosts appear on the source side and the receiver side. However, whereas the receiver-side ghost problem has been studied in detail, and many different solutions have been proposed and implemented commercially, the source-side ghost problem has remained largely unsolved with few satisfactory solutions available. We have developed a new and simple method to remove sea-surface ghosts that is related to the recently introduced concept of signal apparition. As opposed to the temporal/spatial source signature modulation functions used in the original signal apparition theory, our source deghosting method relies on using sources at different depths but not at the same lateral positions. The new method promises to be particularly suitable for 3D applications on sparse or incomplete acquisition geometries.
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Shapiro, Ilya L., Ana M. Pelinson, and Filipe de O. Salles. "Gravitational waves and perspectives for quantum gravity." Modern Physics Letters A 29, no. 30 (September 28, 2014): 1430034. http://dx.doi.org/10.1142/s0217732314300341.

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Understanding the role of higher derivatives is probably one of the most relevant questions in quantum gravity theory. Already at the semiclassical level, when gravity is a classical background for quantum matter fields, the action of gravity should include fourth derivative terms to provide renormalizability in the vacuum sector. The same situation holds in the quantum theory of metric. At the same time, including the fourth derivative terms means the presence of massive ghosts, which are gauge-independent massive states with negative kinetic energy. At both classical and quantum level such ghosts violate stability and hence the theory becomes inconsistent. Several approaches to solve this contradiction were invented and we are proposing one more, which looks simpler than those what were considered before. We explore the dynamics of the gravitational waves on the background of classical solutions and give certain arguments that massive ghosts produce instability only when they are present as physical particles. At least on the cosmological background one can observe that if the initial frequency of the metric perturbations is much smaller than the mass of the ghost, no instabilities are present.
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Aytun, Katibe. "The footsteps of the receiver ghost in the f-k domain." GEOPHYSICS 64, no. 5 (September 1999): 1618–26. http://dx.doi.org/10.1190/1.1444666.

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Waves traveling upward from subsurface reflective strata continue propagating after they are recorded by receivers as primary reflections. When a sharp velocity discontinuity exists above the receivers, the waves are then reflected back, and are once more recorded by the same receivers but as downgoing waves. This phenomenon is known as the receiver ghost. Based on a thorough study of the f-k response of the receiver ghost in a record, this paper shows that the null frequencies are caused by the time differences between the primary and the ghost arrivals, and that they vary with the angle of incidence. It is further shown that the loci of the null frequencies of each harmonic is a member of a family of hyperbolas with a common pair of asymptotes in the f-k domain.
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Surette, Ray. "A copycat crime meme: Ghost riding the whip." Crime, Media, Culture: An International Journal 16, no. 2 (August 1, 2019): 239–64. http://dx.doi.org/10.1177/1741659019865305.

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A 2006 US copycat crime wave came into being, surged with thousands of crimes committed, and dissipated without substantial news media attention. The development of this early copycat crime meme is traceable to the nature of the crime, “ghost riding the whip,” and the social media and popular music communication channels associated with it. Ghost riding the whip involved traffic violations where drivers exit their cars and dance atop or alongside the moving driverless vehicles. Social media allowed the widespread diffusion of detailed instructions that spread this crime from a single minority community to the middle class within a 3-month period. The study of this copycat crime meme examined four types of data: Google Trends, rap songs, ProQuest news media data, and YouTube videos. The examination of the crime wave suggests how Gabriel Tarde’s 19th-century ideas operate in the contemporary social media era. However, unlike pre-social media-based crime waves that were launched via interpersonal and legacy media communication pathways, for ghost riding, rap songs, YouTube postings, and Google searches spurred its growth. Legacy media were found to be most important during the crime wave’s decline, but not during its diffusion. For this copycat crime meme, social media’s influence flowed in a unique upward and outward pattern and the results raise the research questions as to how social media have changed the dynamics of crime waves and how important legacy media will be in future crime waves.
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Waseer, Waleed Iqbal, Qaisar Abbas Naqvi, and M. Juniad Mughal. "Non-uniform plane waves (ghost waves) in general anisotropic medium." Optics Communications 453 (December 2019): 124334. http://dx.doi.org/10.1016/j.optcom.2019.124334.

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Mohseni, Morteza. "Gravitational waves in ghost free bimetric gravity." Journal of Cosmology and Astroparticle Physics 2012, no. 11 (November 14, 2012): 023. http://dx.doi.org/10.1088/1475-7516/2012/11/023.

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Baranov, Denis. "Seeing a ghost: hybrid waves in anisotropic crystals." Advanced Photonics 1, no. 04 (August 29, 2019): 1. http://dx.doi.org/10.1117/1.ap.1.4.040501.

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Domenico, S. N. "Harnessing the ghost." GEOPHYSICS 55, no. 5 (May 1990): 608–18. http://dx.doi.org/10.1190/1.1442872.

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A previous field experiment demonstrated that the interface between an air‐water mixture of low fractional air volume (say, 0.005) and air‐free water is an effective reflector of acoustic waves, suggesting that acoustic waves in water might be beamed by placing an energy source at the focus of a paraboloidal interface between an air‐water mixture and air‐free water. When this interface is concave downward, wave energy traveling upward and outward from the source at the focus is reflected downward and the surface reflection (ghost) is eliminated. Accordingly, a paraboloid reflector consisting of perforated circular air pipes was constructed and tested with a small water gun at its focus. The structure, suspended from its apex, had a height of 4 ft (1.2 m), a base diameter of 8 ft (2.4 m), and a focus 1 ft (0.3 m) below the apex. The wave field, measured with an air‐bubble stream emanating from the perforated pipes, displays a beam with a nearly constant half‐width of 22 ft (6.7 m) created by the paraboloid reflector. Signal amplitudes directly below the paraboloid on an extension of its axis are as much as 9 dB above, and off‐axis amplitudes are as much as 17 dB below, signal amplitudes for no air‐bubble stream. The source signal’s amplitude spectrum, extending to about 1.5 kHz, is skewed toward higher frequencies by the paraboloid reflector, resulting in a dominant peak frequency of about 1210 Hz. The ghost is not evident. Theoretical wave fields of beamed monofrequency source signals demonstrate that the paraboloid reflector behaves as a high‐cut filter, the band‐pass narrowing as axial distance to the paraboloid decreases and off‐axis distance increases. Axial rates of decrease of the beamed experimental signal with increasing depth, at depths of 20 ft (6.1 m) and greater below the source, compare favorably to those of beamed theoretical continuous sinusoidal signals which are nearly equal at all frequencies within the experimental signal’s frequency band. Additional research is required to determine the complete effect of the paraboloid reflector on water‐gun signal characteristics. The small prototype reflector used in this experiment is not suitable for typical seismic exploration efforts because it produces excessively high‐frequency content. A useful paraboloid reflector may have to be several times the size of this prototype.
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Wang, Linfei, Zhong Wang, Huaishan Liu, Jin Zhang, Lei Xing, and Yanxin Yin. "Hydrate-Bearing Sediment Imaging of Ghost Reflection in Vertical Cable Seismic Data Using Seismic Interferometry." Geofluids 2022 (September 25, 2022): 1–7. http://dx.doi.org/10.1155/2022/3501755.

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Marine vertical cable seismic (VCS) collects seismic waves by hydrophone array vertically suspended in seawater to prospect the offshore geological structure and monitor the reservoir. Due to its irregular source-receiver geometry, the primary imaging has narrow illustration coverage. Here, we proposed a cross-correlation transformation based on ghost wave interferometry. This method can transform the ghost reflections from the vertical cable seismic profile into the virtual surface seismic primaries just like those excited by the source and recorded by marine seismic towed-streamer below sea surface. After processing these virtual primaries with conventional method, we can obtain the ghost reflection imaging section with high resolution which effectively extend the illustration footprints in the subsurface. By application of this transform, virtual primaries are generated from the first-order ghost reflections of the actual VCS data. Then, migration of these virtual primaries provides a high-resolution image of hydrate-bearing sediments.
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Dissertations / Theses on the topic "Ghost waves"

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Baille, Kevin. "Fine-scale structures in Saturn's rings waves, wakes and ghosts." Doctoral diss., University of Central Florida, 2011. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/4840.

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The Cassini mission provided wonderful tools to explore Saturn, its satellites and its rings system. The UVIS instrument allowed stellar occultation observations of structures in the rings with the best resolution available (around 10 meters depending on geometry and navigation), bringing our understanding of the physics of the rings to the next level. In particular, we have been able to observe, dissect, model and test the interactions between the satellites and the rings. We first looked at kilometer-wide structures generated by resonances with satellites orbiting outside the main rings. The observation of structures in the C ring and their association with a few new resonances allowed us to estimate some constraints on the physical characteristics of the rings. However, most of our observed structures could not be explained with simple resonances with external satellites and some other mechanism has to be involved. We located four density waves associated with the Mimas 4:1, the Atlas 2:1, the Mimas 6:2 and the Pandora 4:2 Inner Lindblad Resonances and one bending wave excited by the Titan -1:0 Inner Vertical Resonance. We could estimate a range of surface mass density from 0.22 ([plus or minus]0.03) to 1.42 ([plus or minus]0.21) g cm[super-2] and mass extinction coefficient from 0.13 ([plus or minus]0.03) to 0.28 ([plus or minus]0.06) cm[super2] g[super-1]. These mass extinction coefficient values are higher than those found in the A ring (0.01 - 0.02 cm[super2] g[super-1]) and in the Cassini Division (0.07 - 0.12 cm[super2] g[super-1] from Colwell et al. (2009), implying smaller particle sizes in the C ring. We can therefore imagine that the particles composing these different rings have either different origins or that their size distributions are not primordial and have evolved differently.; Using numerical simulations for the propeller formation, we estimate that our observed moonlets belong to a population of bigger particles than the one we thought was composing the rings: Zebker et al. (1985) described the ring particles population as following a power-law size distribution with cumulative index around 1.75 in the Cassini Division and 2.1 in the C ring. We believe propeller boulders follow a power-law with a cumulative index of 0.6 in the C ring and 0.8 in the Cassini Division. The question of whether these boulders are young, ephemeral and accreted inside the Roche limit or long-lived and maybe formed outisde by fragmentation of a larger body before migrating inward in the disk, remains a mystery. Accretion and fragmentation process are not yet well constrained and we can hope that Cassini extended mission will still provide a lot of information about it.; We also estimate the mass of the C ring to be between 3.7 ([plus or minus]0.9) x 10[super16] kg and 7.9 ([plus or minus]2.0) x 10[super16] kg, equivalent to a moon of 28.0 ([plus or minus]2.3) km to 36.2 ([plus or minus]3.0) km radius (a little larger than Pan or Atlas) with a density comparable to the two moons (400 kg m[super-3]). From the wave damping length and the ring viscosity, we also estimate the vertical thickness of the C ring to be between 1.9 ([plus or minus]0.4) m and 5.6 ([plus or minus]1.4) m, which is consistent with the vertical thickness of the Cassini Division (2 - 20 m) from Tiscareno et al. (2007) and Colwell et al. (2009). Conducting similar analysis in the A, B rings and in the Cassini Division, we were able to estimate consistent masses with previous works for the these rings. We then investigated possible interactions between the rings and potential embedded satellites. Looking for satellite footprints, we estimated the possibility that some observed features in the Huygens Ringlet could be wakes of an embedded moon in the Huygens gap. We discredited the idea that these structures could actually be satellite wakes by estimating the possible position of such a satellite. Finally, we observed a whole population of narrow and clear holes in the C ring and the Cassini Division. Modeling these holes as depletion zones opened by the interaction of a moonlet inside the disk material (this signature is called a "propeller"), we could estimate a distribution of the meter-sized to house-sized objects in these rings. Similar objects, though an order of magnitude larger, have been visually identified in the A ring. In the C ring, we have signatures of boulders which sizes are estimated between 1.5 and 14.5 m, whereas similar measures in the Cassini Division provide moonlet sizes between 0.36 and 58.1 m.
ID: 030422748; System requirements: World Wide Web browser and PDF reader.; Mode of access: World Wide Web.; Thesis (Ph.D.)--University of Central Florida, 2011.; Includes bibliographical references (p. 269-295).
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Books on the topic "Ghost waves"

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McManus, James. Ghost waves. New York: Grove Press, 1988.

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Nonlinear water waves with applications to wave-current interactions and tsunamis. Philadelphia: Society for Industrial and Applied Mathematics, 2011.

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Dixon, Chris. Ghost wave: The discovery of Cortes Bank and the biggest wave on earth. San Francisco, Calif: Chronicle Books, 2011.

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Gravity's ghost: Scientific discovery in the twenty-first century. Chicago: University of Chicago Press, 2011.

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Ghosts & legends of Wales. Norwich: Jarrold Colour Publications, 1987.

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Rumours & oddities from North Wales: A selection of folklore, myths & ghost stories. Llanrwst, Gwynedd: Gwasg Carreg Gwalch, 1986.

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Saunders, Christian. Into the dragon's lair: A supernatural history of Wales. Llanrwst: Gwasg Carreg Gwlach, 2003.

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Baker, Mark. The ghosts of Gwrych Castle, Abergele, North Wales. [Colwyn Bay]: The author, 2004.

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Institute of Economic Affairs (Ghana), ed. Ghost names, shadow workers, and the public sector wage bill. Accra: Institute of Economic Affairs, 2002.

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Twigg, Aeres. The green hawk. Llandysul: Pont, 2000.

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Book chapters on the topic "Ghost waves"

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Liu, T. G., W. F. Xie, C. Turangan, and B. C. Khoo. "The modified ghost fluid method for shock-structure interaction in the presence of cavitation." In Shock Waves, 1059–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-85181-3_43.

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Gao, S., and T. G. Liu. "Modified Ghost Fluid Method for the Fluid Elastic-Perfectly Plastic Solid Interaction." In 30th International Symposium on Shock Waves 2, 1245–49. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-44866-4_79.

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Russ, Vanessa. "‘Ghost Habitats’." In A History of Aboriginal Art in the Art Gallery of New South Wales, 11–34. Names: Russ, Vanessa, author.Title: A History of Aboriginal Art in the Art Gallery of New South Wales / Vanessa Russ.Description: New York : Routledge, 2021.: Routledge, 2021. http://dx.doi.org/10.4324/9781003128014-1.

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Langton, Rae, and Christopher Robichaud. "Ghosts in the World Machine? Humility and Its Alternatives." In New Waves in Metaphysics, 156–78. London: Palgrave Macmillan UK, 2010. http://dx.doi.org/10.1057/9780230297425_9.

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Davenport, Tony. "Sex, Ghosts, and Dreams: Walter Map (1135?–1210?) and Gerald of Wales (1146–1223)." In Writers of the Reign of Henry II, 133–50. New York: Palgrave Macmillan US, 2006. http://dx.doi.org/10.1007/978-1-137-08855-0_6.

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"Spiritual Carnality: Lars von Trier’s Breaking the Waves and Flannery O’Connor’s “A Temple of the Holy Ghost”." In Negotiating Sexual Idioms, 1–17. Brill | Rodopi, 2008. http://dx.doi.org/10.1163/9789401206525_002.

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"Hawking Their Wares." In Ghost Signs of Arkansas, 31–43. University of Arkansas Press, 1997. http://dx.doi.org/10.2307/j.ctv1xq3dp0.7.

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Aaron, Jane. "Haunted Wales." In The Routledge Handbook to the Ghost Story, 197–205. Routledge, 2017. http://dx.doi.org/10.4324/9781315644417-21.

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"CHAPTER 2. A New Wave of Europeans: 1492–1659." In Needles, Herbs, Gods, and Ghosts, 36–71. Harvard University Press, 2005. http://dx.doi.org/10.4159/9780674020542-004.

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Gallagher, Jim. "The Ghost in the Machine? The Government of England." In Governing England, 69–90. British Academy, 2018. http://dx.doi.org/10.5871/bacad/9780197266465.003.0004.

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The asymmetry of the UK as a union means that England, unlike Scotland, Wales and Northern Ireland, not only has no domestic legislature but no executive of its own either. Westminster is England’s Parliament and the UK Government is England’s Government. Much attention has been devoted to the (parliamentary) anomaly of the West Lothian Question, but there has been little discussion of England’s Government. This chapter asks whether the UK Government contains a ghost in the machine: an embryonic English Government, perhaps in English departments or cabinet committees, or shown in social or economic policy or in taxation and spending. It notes how deeply entangled UK and English economic and fiscal policy are, notably via the Barnett formula, and considers the options for more explicit English governance such as a ‘Minister for England’, but questions how politically salient this would be when the main issue is England’s relations with Europe.
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Conference papers on the topic "Ghost waves"

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Narimanov, Evgenii. "Electromagnenic Ghost Waves." In CLEO: Applications and Technology. Washington, D.C.: OSA, 2018. http://dx.doi.org/10.1364/cleo_at.2018.jtu2a.144.

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Narimanov, Evgenii. "Nonlinear Optics with Ghost Waves." In Nonlinear Optics. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/nlo.2017.nth3a.6.

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Khan, Emroz, and Evgenii E. Narimanov. "Ghost Sensing." In CLEO: Applications and Technology. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/cleo_at.2022.jw3a.65.

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We show the recently discovered ghost waves - a class of non-uniform waves in biaxial media - can be used for optical sensing based on exceptional points. In addition to showing high sensitivity, the proposed sensor employs planar geometry and is robust against noise.
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Tanvir, Huda, B. M. A. Rahman, and K. T. V. Grattan. "Ghost modes in Terahertz Quantum Cascade Laser waveguides." In 2011 36th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz 2011). IEEE, 2011. http://dx.doi.org/10.1109/irmmw-thz.2011.6104778.

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Wang, G., Z. Hu, Y. Tian, L. Han, Z. Xu, C. Jiang, and W. Liu. "The propagation phenomenon of multiple waves and ghost waves in seismic physical modeling experiment." In 82nd EAGE Annual Conference & Exhibition. European Association of Geoscientists & Engineers, 2021. http://dx.doi.org/10.3997/2214-4609.202112690.

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Olivieri, Luana, Luke Peters, Juan S. Totero Gongora, Alessia Pasquazi, and Marco Peccianti. "Time-Resolved Nonlinear Ghost-Imaging for Terahertz 3D microscopy." In 2022 47th International Conference on Infrared, Millimeter and Terahertz Waves (IRMMW-THz). IEEE, 2022. http://dx.doi.org/10.1109/irmmw-thz50927.2022.9895765.

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Aggarwal, Ankit, Mayilvahanan Alagan Chella, Arun Kamath, Hans Bihs, and Øivind Asgeir Arnsten. "Numerical Simulation of Irregular Wave Forces on a Horizontal Cylinder." In ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54423.

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In the present study, the irregular wave forces on a fully submerged circular cylinder are investigated using the open-source computational fluid dynamics (CFD) model REEF3D. A complete three dimensional representation of the ocean waves requires the consideration of the sea surface as an irregular wave train with the random characteristics. The numerical model uses the incompressible Reynolds-averaged Navier-Stokes (RANS) equations together with the continuity equation to solve the fluid flow problem. Turbulence modeling is carried out using the two equation k-ω model. Spatial discretization is done using an uniform Cartesian grid. The level set method is used for computing the free surface. For time discretization, third-order total variation diminishing (TVD) Runge Kutta scheme is used. Ghost cell boundary method is used for implementing the complex geometries in the numerical model. MPI is used for the exchange of the value of a ghost cell. Relaxation method is used for the wave generation. The numerical model is validated for the irregular waves for a wave tank without any structure. Further, the numerical model is validated by comparing the numerical results with the experimental data for a fully submerged circular cylinder under regular waves and irregular waves. The numerical results are in a good agreement with the experimental data for the regular and irregular wave forces. The JONSWAP spectrum is used for the wave generation. The free surface features and kinematics around the cylinder is also presented and discussed.
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Johannisson, Pontus, Dan Anderson, Anders Berntson, and Jonas Mårtensson. "Perturbational Analysis of the Generation of Ghost Pulses in 40 Gbit/s Fibre-Optic Communication Systems." In Nonlinear Guided Waves and Their Applications. Washington, D.C.: OSA, 2001. http://dx.doi.org/10.1364/nlgw.2001.mc74.

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Khan, Emroz, and Evgenii E. Narimanov. "Ghost Exchange: Ferromagnetic-antiferromagnetic Phase Transition in Linear Optics of Non-magnetic Dielectrics." In Frontiers in Optics. Washington, D.C.: Optica Publishing Group, 2022. http://dx.doi.org/10.1364/fio.2022.fth3c.1.

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With the recent discovery of electromagnetic ghost waves, the dynamics of correlated fermionic systems and their associated phase transitions can be mapped to the linear optics of a layered composite of biaxial-anisotropic and isotropic media.
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Jinbo, Yoshinori, and Hiroyuki Takahira. "Numerical Investigations of Thermal Effects on the Interaction of Shock Waves With Bubbles." In ASME-JSME-KSME 2011 Joint Fluids Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/ajk2011-33022.

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The present study deals with the collapse of nonspherical bubbles in a compressible liquid by taking the thermal diffusion into account. The ghost fluid method (GFM) is modified so as to consider the thermal diffusion through the bubble surface. The boundary condition for the temperature continuity at the interface is discussed for determining the values of the ghost fluids. The improved GFM is applied to the collapse of a single spherical bubble. The present results are in good agreement with those obtained from the equation of motion for a single bubble (Keller equation) coupling with the energy equation. The improved multigrid GFM is also applied to the interaction of a gas bubble with a strong shock wave. The non-spherical bubble collapse is simulated successfully by taking the thermal diffusion into account. The thermal boundary layers both inside and outside the bubble are captured with the present method although the thermal boundary layer in liquid is very thin. The bubble collapse due to the incident shock wave accompanies the formation of the liquid jets and shock waves leading to the high temperature field. The influence of thermal diffusion becomes more prominent when the initial bubble radius is small. It is shown that a large amount of heat outflows from the interior of the bubble to the liquid when the liquid jet hits the downstream surface of the bubble and the bubble rebounds. The increased thermal diffusion causes the decrease of the internal pressure and temperature in the bubble leading to more violent collapse.
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