Academic literature on the topic 'Ionization bubbles'

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Journal articles on the topic "Ionization bubbles"

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Danehkar, A., M. S. Oey, and W. J. Gray. "Numerical Modeling of Galactic Superwinds with Time-evolving Stellar Feedback." Proceedings of the International Astronomical Union 17, S370 (2021): 217–22. http://dx.doi.org/10.1017/s1743921323000066.

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AbstractMass-loss and radiation feedback from evolving massive stars produce galactic-scale superwinds, sometimes surrounded by pressure-driven bubbles. Using the time-dependent stellar population typically seen in star-forming regions, we conduct hydrodynamic simulations of a starburst-driven superwind model coupled with radiative efficiency rates to investigate the formation of radiative cooling superwinds and bubbles. Our numerical simulations depict the parameter space where radiative cooling superwinds with or without bubbles occur. Moreover, we employ the physical properties and time-dep
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Dwarkadas, Vikram V. "On the Evolution of, and Hot Gas in, Wind-Blown Bubbles around Massive Stars - Wind Bubbles Are Not Energy-Conserving." Galaxies 11, no. 3 (2023): 78. http://dx.doi.org/10.3390/galaxies11030078.

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The structure and evolution of wind-blown bubbles (WBBs) around massive stars has primarilybeen investigated using an energy-conserving model of wind-blown bubbles. While this model is useful in explaining the general properties of the evolution, several problems remain, including inconsistencies between observed wind luminosities and those derived using this formulation. Major difficulties include the low X-ray temperature and X-ray luminosity, compared to the model. In this paper, we re-examine the evolution, dynamics, and kinematics of WBBs around massive stars, using published ionization g
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Bolotnova, R. Kh. "Wide-range equations of state for organic liquids." Proceedings of the Mavlyutov Institute of Mechanics 5 (2007): 113–20. http://dx.doi.org/10.21662/uim2007.1.011.

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The method of construction the wide-range equations of state for organic liquids, describing the gas and liquid phases including dissociation and ionization which occurs during an intense collapse of steam bubbles and accompanied by ultra-high pressures and temperatures, is proposed.
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Xu, Yidong, Bin Yue, and Xuelei Chen. "The Neutral Islands during the Late Epoch of Reionization." Proceedings of the International Astronomical Union 12, S333 (2017): 64–67. http://dx.doi.org/10.1017/s174392131701153x.

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AbstractThe large-scale structure of the ionization field during the epoch of reionization (EoR) can be modeled by the excursion set theory. While the growth of ionized regions during the early stage are described by the “bubble model”, the shrinking process of neutral regions after the percolation of the ionized region calls for an “island model”. An excursion set based analytical model and a semi-numerical code (islandFAST) have been developed. The ionizing background and the bubbles inside the islands are also included in the treatment. With two kinds of absorbers of ionizing photons, i.e.
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Soria, R., M. W. Pakull, C. Motch, et al. "The ultraluminous X-ray source bubble in NGC 5585." Monthly Notices of the Royal Astronomical Society 501, no. 2 (2020): 1644–62. http://dx.doi.org/10.1093/mnras/staa3784.

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ABSTRACT Some ultraluminous X-ray sources (ULXs) are surrounded by collisionally ionized bubbles, larger and more energetic than supernova remnants: they are evidence of the powerful outflows associated with super-Eddington X-ray sources. We illustrate the most recent addition to this class: a huge (350 pc × 220 pc in diameter) bubble around a ULX in NGC 5585. We modelled the X-ray properties of the ULX (a broadened-disc source with LX ≈ 2–4 × 1039 erg s−1) from Chandra and XMM–Newton, and identified its likely optical counterpart in Hubble Space Telescope images. We used the Large Binocular T
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Kutovyi, Volodymyr. "Thermal Vacuum Process of Dispersing Heterogeneous Materials." American Journal of Physics and Applications 13, no. 3 (2025): 59–67. https://doi.org/10.11648/j.ajpa.20251303.12.

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The presented work examines physical processes in a thermal vacuum installation, which allow for the effective dispersion of heterogeneous materials within 15 seconds. An analysis of heat and mass transfer processes that affect the dispersion of heterogeneous materials been carried out. Calculations of the speed, frequency and wavelength in spiral heating element of the thermal vacuum installation been made for different angles of motion of material particles. It been established that the speed of motion of a material particle in the cavity of the heating element can be more than a thousand ki
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Yasui, Kyuichi. "Multibubble Sonoluminescence from a Theoretical Perspective." Molecules 26, no. 15 (2021): 4624. http://dx.doi.org/10.3390/molecules26154624.

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In the present review, complexity in multibubble sonoluminescence (MBSL) is discussed. At relatively low ultrasonic frequency, a cavitation bubble is filled mostly with water vapor at relatively high acoustic amplitude which results in OH-line emission by chemiluminescence as well as emissions from weakly ionized plasma formed inside a bubble at the end of the violent bubble collapse. At relatively high ultrasonic frequency or at relatively low acoustic amplitude at relatively low ultrasonic frequency, a cavitation bubble is mostly filled with noncondensable gases such as air or argon at the e
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Dwarkadas, Vikram V. "Ionization-Gasdynamic Simulations of Wind-Blown Nebulae around Massive Stars." Galaxies 10, no. 1 (2022): 37. http://dx.doi.org/10.3390/galaxies10010037.

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Using a code that employs a self-consistent method for computing the effects of photo-ionization on circumstellar gas dynamics, we model the formation of wind-driven nebulae around massive stars. We take into account changes in stellar properties and mass-loss over the star’s evolution. Our simulations show how various properties, such as the density and ionization fraction, change throughout the evolution of the star. The multi-dimensional simulations reveal the presence of strong ionization front instabilities in the main-sequence phase, similar to those seen in galactic ionization fronts. H
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Medling, Anne M., Lisa J. Kewley, Daniela Calzetti, et al. "Tracing the Ionization Structure of the Shocked Filaments of NGC 6240." Astrophysical Journal 923, no. 2 (2021): 160. http://dx.doi.org/10.3847/1538-4357/ac2ebb.

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Abstract We study the ionization and excitation structure of the interstellar medium in the late-stage gas-rich galaxy merger NGC 6240 using a suite of emission-line maps at ∼25 pc resolution from the Hubble Space Telescope, Keck/NIRC2 with Adaptive Optics, and the Atacama Large Millimeter/submillimeter Array (ALMA). NGC 6240 hosts a superwind driven by intense star formation and/or one or both of two active nuclei; the outflows produce bubbles and filaments seen in shock tracers from warm molecular gas (H2 2.12 μm) to optical ionized gas ([O iii], [N ii], [S ii], and [O i]) and hot plasma (Fe
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Gorce, Adélie, and Jonathan R. Pritchard. "Studying the morphology of reionization with the triangle correlation function of phases." Monthly Notices of the Royal Astronomical Society 489, no. 1 (2019): 1321–37. http://dx.doi.org/10.1093/mnras/stz2195.

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ABSTRACT We present a new statistical tool, called the triangle correlation function (TCF), inspired by the earlier work of Obreschkow et al. It is derived from the three-point correlation function and aims to probe the characteristic scale of ionized regions during the epoch of reionization from 21cm interferometric observations. Unlike most works, which focus on power spectrum, i.e. amplitude information, our statistic is based on the information we can extract from the phases of the Fourier transform of the ionization field. In this perspective, it may benefit from the well-known interferom
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Dissertations / Theses on the topic "Ionization bubbles"

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Khadka, Sovit M. "Multi-diagnostic Investigations of the Equatorial and Low-latitude Ionospheric Electrodynamics and Their Impacts on Space-based Technologies." Thesis, Boston College, 2018. http://hdl.handle.net/2345/bc-ir:108001.

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Thesis advisor: Prof. Michael J. Naughton<br>Thesis advisor: Dr. Cesar E. Valladares<br>The equatorial and low-latitude ionosphere of the Earth exhibits unique features on its structuring, coupling, and electrodynamics that offer the possibility to forecast the dynamics and fluctuations of ionospheric plasma densities at later times. The scientific understanding and forecasting of ionospheric plasma are necessary for several practical applications, such as for mitigating the adverse effects of space weather on communication, navigation, power grids, space mission, and for various scientific ex
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Raste, Janakee. "Analytical Formalism to Study the 21 cm Signal from Cosmic Dawn and Epoch of Reionization." Thesis, 2019. https://etd.iisc.ac.in/handle/2005/4746.

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The epoch of Cosmic Dawn and Reionization is one of the most important time periods of the universe when first sources of radiation like stars and galaxies were formed, and they changed the properties of their surrounding medium. 21 cm radiation emitted due to the hyperfine splitting of ground state of neutral hydrogen is one of the most important probes to study the state and dynamics of neutral medium during this epoch. I present an analytical formalism to compute the fluctuating component of the 21 cm signal from CD/EoR. I have used excursion set formalism to calculate the size distri
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"Effects of ionization in a single sonoluminescing bubble." 2000. http://library.cuhk.edu.hk/record=b5890351.

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Ho Chun Yan = 電離對單泡聲致發光的影響 / 何俊恩.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2000.<br>Includes bibliographical references (leaves [90]-93).<br>Text in English; abstracts in English and Chinese.<br>Ho Chun Yan = Dian li dui dan pao sheng zhi fa guang de ying xiang / He Junen.<br>Abstract --- p.i<br>Acknowledgements --- p.ii<br>Contents --- p.iii<br>List of Figures --- p.vii<br>List of Tables --- p.xii<br>Chapter Chapter 1. --- Introduction --- p.1<br>Chapter Chapter 2. --- Hydro dynamical Framework --- p.7<br>Chapter 2.1 --- Bubble wall motion --- p.8<br>Chapter 2.2 --- Navie
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Books on the topic "Ionization bubbles"

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Gravity wave seeding of equatorial plasma bubbles. National Aeronautics and Space Administration, 1997.

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Book chapters on the topic "Ionization bubbles"

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Jenkins, Edward B. "Pressure and Ionization Balances in the Circum-Heliospheric Interstellar Medium and the Local Bubble." In From the Outer Heliosphere to the Local Bubble. Springer New York, 2008. http://dx.doi.org/10.1007/978-1-4419-0247-4_16.

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Conference papers on the topic "Ionization bubbles"

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Miller, Kyle G., Jacob R. Pierce, Manfred V. Ambat, et al. "Dephasingless Laser Wakefield Acceleration in the Bubble Regime." In CLEO: Applications and Technology. Optica Publishing Group, 2024. https://doi.org/10.1364/cleo_at.2024.ath3h.4.

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An ultrashort flying-focus pulse created by an axiparabola and radial echelon drives a dephasingless laser wakefield accelerator in the bubble regime. Simulations show that 25 pC of ionization-injected electrons gain 2.1 GeV over 20 dephasing lengths (1.3 cm), with projected energy gains of 125 GeV over &lt;1 m.
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Yamamoto, Marino, Jun Kataoka, and Yoshiaki Sofue. "Discovery of non-equilibrium ionization plasma around the Fermi Bubble; new evidence of past activity of the Galactic center." In 7th Heidelberg International Symposium on High-Energy Gamma-Ray Astronomy. Sissa Medialab, 2024. http://dx.doi.org/10.22323/1.417.0124.

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Menchiari, Stefano, Giovanni Morlino, Elena Amato, and Niccolò Bucciantini. "Cosmic ray induced ionization of molecular clouds embedded in the wind blown bubbles of massive star clusters." In 38th International Cosmic Ray Conference. Sissa Medialab, 2023. http://dx.doi.org/10.22323/1.444.0059.

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Tabei, Katsuine, Shunji Mashiko, and Hiroyuki Shirai. "Study of Cavitation Light Emission Generated by a Waterhammer." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45274.

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Cavitation light emission generated by a waterhammer is investigated experimentally and theoretically for water containing a small amount of rare gas (xenon and argon). In the experiment, the water is forced to flow upwards in an evacuated vertical circular tube by the rapid opening of a ball valve that is connected to the liquid reservoir. The liquid vaporizes until the flow reaches the top end of the tube, and many minute cavitation bubbles are generated in the liquid. When the water column collides with the end of the closed pipe, a waterhammer with a pressure of over 1 MPa is generated in
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Shkolnikov, P. L., and A. E. Kaplan. "Backward and multi-echo field ionization by intense non-envelope "superpulses"." In Applications of High Field and Short Wavelength Sources. Optica Publishing Group, 1997. http://dx.doi.org/10.1364/hfsw.1997.the29.

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Recently, we have proposed two avenues to generating ultrashort (potentially, subfemtosecond) and intense (up to atomic fields) nonoscillating pulses: a high-repetition train of such pulses can be produced in multicomponent stimulated Raman scattering [1], and a single pulse ("electromagnetic bubble" -- EMB) or several of them can result [2,3] from the propagation of an initially broad unipolar pulse (half-cycle pulse -- HCP [4]) in an appropriate nonlinear medium. Such pulses could cause a substantial "shake-up" excitation or ionization of an atomic system within the time much smaller than an
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Vogel, Alfred, and Joachim Noack. "Numerical Simulation of Optical Breakdown for Cellular Surgery at Nanosecond to Femtosecond Time Scales." In European Conference on Biomedical Optics. Optica Publishing Group, 2001. http://dx.doi.org/10.1364/ecbo.2001.4433_70.

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We have shown by experimental investigations that cellular surgery (microdissection, optoporation, and optoinjection) with Nd:YAG laser pulses of 1064 nm and 532 nm wavelength relies on nonlinear absorption leading to optical breakdown and plasma formation at the laser focus. The present study explores possibilities of refining the breakdown effects by employing shorter pulse durations and irradiances that generate plasmas below the threshold for shock wave and bubble formation. Optical breakdown in water at NA = 0.9 and NA = 1.3 was simulated numerically for wavelengths of 1064 nm, 532 nm and
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