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Journal articles on the topic 'H-bubbles'

Author: Grafiati

Published: 14 March 2023

Last updated: 31 July 2025

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1

Guerra, André, Xavier Lamy, and Konstantinos Zemas. "On the existence of degenerate solutions of the two-dimensional H-system." Comptes Rendus. Mathématique 363, G3 (2025): 271–81. https://doi.org/10.5802/crmath.731.

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We consider entire solutions ω∈H ˙ 1 (ℝ 2 ;ℝ 3 ) of the H-systemΔω=2ω x ∧ω y which we refer to as bubbles. Surprisingly, and contrary to conjectures raised in the literature, we find that bubbles with degree at least three can be degenerate: the linearized H-system around a bubble can admit solutions that are not tangent to the smooth family of bubbles. We then give a complete algebraic characterization of degenerate bubbles.

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2

Occhionero, Franco, Luca Amendola, and Pier Stefano Corasaniti. "Primordial Bubbles within Primordial Bubbles." Symposium - International Astronomical Union 201 (2005): 497–98. http://dx.doi.org/10.1017/s0074180900216847.

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Two consecutive, distinct episodes of phase transition occurring during inflation may nucleate two generations of bubbles, one inside the other. We design a model of inflation that realizes this sequence and yields bubble spectra that are bimodal and tunable functions of phenomelogical parameters in turn combinations of microphysical parameters. We argue in favor of a tuning of the parameters such that the outer and earlier generation of bubbles becomes hundreds of Mpc/h in diameter (like the local Hubble bubbles of the literature) whereas the inner and later generation becomes tens of Mpc/h i

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3

Li, G., B. Ning, L. Liu, W. Wan, and J. Y. Liu. "Effect of magnetic activity on plasma bubbles over equatorial and low-latitude regions in East Asia." Annales Geophysicae 27, no. 1 (2009): 303–12. http://dx.doi.org/10.5194/angeo-27-303-2009.

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Abstract. The dependence of plasma bubble occurrence in the eveningside ionosphere, with magnetic activity during the period years 2001–2004, is studied here based on the TEC observations gathered by ground-based GPS receivers which are located in the equatorial and low-latitude regions in East Asia. The observed plasma bubbles consist of the plasma-bubble events in the equatorial (stations GUAM, PIMO and KAYT), and low-latitude regions (stations WUHN, DAEJ and SHAO). It is shown that most equatorial plasma-bubble events commence at 20:00 LT, and may last for >60 min. The magnetic activity

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4

Randsoe, Thomas, and Ole Hyldegaard. "Effect of oxygen breathing on micro oxygen bubbles in nitrogen-depleted rat adipose tissue at sea level and 25 kPa altitude exposures." Journal of Applied Physiology 113, no. 3 (2012): 426–33. http://dx.doi.org/10.1152/japplphysiol.00193.2012.

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The standard treatment of altitude decompression sickness (aDCS) caused by nitrogen bubble formation is oxygen breathing and recompression. However, micro air bubbles (containing 79% nitrogen), injected into adipose tissue, grow and stabilize at 25 kPa regardless of continued oxygen breathing and the tissue nitrogen pressure. To quantify the contribution of oxygen to bubble growth at altitude, micro oxygen bubbles (containing 0% nitrogen) were injected into the adipose tissue of rats depleted from nitrogen by means of preoxygenation (fraction of inspired oxygen = 1.0; 100%) and the bubbles stu

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5

Hou, L. G., and X. Y. Gao. "Radio recombination line observations towards Spitzer infrared bubbles with the TianMa radio telescope." Monthly Notices of the Royal Astronomical Society 489, no. 4 (2019): 4862–74. http://dx.doi.org/10.1093/mnras/stz2466.

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ABSTRACT Many of the Spitzer infrared bubbles identified by the Milky Way Project (MWP) are suggested to be $\rm{H \small {II}} $ regions in nature. More than 70 per cent of the ∼5000 known bubbles do not have radio recombination line (RRL) observations, hence have not been confirmed as $\rm{H \small {II}} $ regions. A systematic RRL survey should be helpful to identify the nature of the bubbles. With the Shanghai TianMa 65-m radio telescope, we searched for RRLs towards 216 selected Spitzer bubbles by simultaneously observing 19 RRLs in the C band (4–8 GHz). RRLs are detected in the direction

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Palmeirim, P., A. Zavagno, D. Elia, et al. "Spatial distribution of star formation related to ionized regions throughout the inner Galactic plane." Astronomy & Astrophysics 605 (September 2017): A35. http://dx.doi.org/10.1051/0004-6361/201629963.

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We present a comprehensive statistical analysis of star-forming objects located in the vicinities of 1360 bubble structures throughout the Galactic plane and their local environments. The compilation of ~70 000 star-forming sources, found in the proximity of the ionized (Hii) regions and detected in both Hi-GAL and GLIMPSE surveys, provided a broad overview of the different evolutionary stages of star-formation in bubbles, from prestellar objects to more evolved young stellar objects (YSOs). Surface density maps of star-forming objects clearly reveal an evolutionary trend where more evolved st

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7

Song, Yan Yan, Guo Qi Liu, Hong Xia Li, and Wen Gang Yang. "Influence of Ladle Purging Plug Airway on Flow Properties of Liquid Steel." Advanced Materials Research 472-475 (February 2012): 2581–87. http://dx.doi.org/10.4028/www.scientific.net/amr.472-475.2581.

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The influence of the different airway structure on mixing time of molten steel are studied through using water model experiments. The bubble volume and velocity have been investigated through the PIV for different airway structure in the flow of 1m3/h. Results showed that with the slit distribution same, the smaller the slit width, the greater the volume percentage of the large bubbles and the average velocity of the bubbles in rising, but the shorter the mixing time. Reduce the number of the slit can lead to the volume percentage of the large bubbles and the average velocity of the bubbles in

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8

Randsøe, T., T. M. Kvist, and O. Hyldegaard. "Effect of oxygen and heliox breathing on air bubbles in adipose tissue during 25-kPa altitude exposures." Journal of Applied Physiology 105, no. 5 (2008): 1492–97. http://dx.doi.org/10.1152/japplphysiol.90840.2008.

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At altitude, bubbles are known to form and grow in blood and tissues causing altitude decompression sickness. Previous reports indicate that treatment of decompression sickness by means of oxygen breathing at altitude may cause unwanted bubble growth. In this report we visually followed the in vivo changes of micro air bubbles injected into adipose tissue of anesthetized rats at 101.3 kPa (sea level) after which they were decompressed from 101.3 kPa to and held at 25 kPa (10,350 m), during breathing of oxygen or a heliox(34:66) mixture (34% helium and 66% oxygen). Furthermore, bubbles were stu

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9

Wang, Ziyue, Liansheng Liu, Runze Duan, and Liang Tian. "The aerobreakup of bubbles in continuous airflow." Physics of Fluids 34, no. 4 (2022): 043317. http://dx.doi.org/10.1063/5.0086604.

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Floating soap bubbles usually break up owing to gravitational drainage, surface evaporation, environmental disturbances, and collisions with objects. If a gust of wind blows into a bubble, does the bubble break, and, if so, how does it do so? This study reports experiments that use a high-speed camera to examine the dynamic behaviors of a suspended bubble that is suddenly exposed to continuous airflow. Specifically, the behaviors and mechanisms of the aerobreakup of bubbles are explored. The suspended bubble undergoes shedding and deformation under aerodynamic force and flows with airflow. As

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10

Ohiomoba, Emmanuel, Ayokunle Omosebi, Gao Xin, and Kunlei Liu. "(Invited) Elucidating the Hydrodynamic Behavior of Multi-Species Gas Bubbles in an Electrochemical Solvent Regenerator for Direct Air Capture." ECS Meeting Abstracts MA2022-02, no. 27 (2022): 1036. http://dx.doi.org/10.1149/ma2022-02271036mtgabs.

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Direct Air Capture (DAC) is very significant to bolstering the global drive towards net negative emissions. DAC technologies/plants have emerged in recent years, with the regeneration of the capture solvent used in the process being the major bottleneck of most aqueous technologies. [1] Leveraging electrochemical principles has offered a potential opportunity to simplify the entire solvent regeneration process and potentially reduce its overall capture cost, compared to traditional approaches. The electrochemical approach also offers the benefit of direct integrating clean energy, and also eli

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11

Di, Pengfei, Dong Feng, Jun Tao, and Duofu Chen. "Using Time-Series Videos to Quantify Methane Bubbles Flux from Natural Cold Seeps in the South China Sea." Minerals 10, no. 3 (2020): 216. http://dx.doi.org/10.3390/min10030216.

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Natural cold seeps are an important source of methane and other greenhouse gases to the ocean and atmosphere in the marine environment. Accurate quantification of methane bubble fluxes from cold seeps is vital for evaluating their influence on the global methane budget and climate change. We quantified the flux of gas bubbles released from two natural cold seep sites in the South China Sea: one seep vent in the Haima cold seeps (1400 m depth) and three seep vents at Site F (1200 m depth). We determined bubble diameter, size distribution, and bubble release rate using image processing technique

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12

Trigona, Carlo, Sara Panebianco, Rosaria Galvagno, and Anna Maria Gueli. "Bubble Sensors for Temperature Measurements through a Colorimetric Approach." Sensors 24, no. 4 (2024): 1278. http://dx.doi.org/10.3390/s24041278.

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This paper introduces an innovative sensor utilizing bubbles coated with thermochromic paint, aiming to facilitate temperature measurements in challenging-to-reach locations without the requirement of an external power source. The research conducted is innovative in terms of both methodology and application. The characterization of the thermochromic properties of paints was, in fact, performed using spectroradiometric measurements by selecting a temperature range useful for applications in various fields including preventive conservation. The study encompasses two main objectives: (1) analyzin

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13

Ostadrahimi, Mahdi, Khodakaram Gharibi, Ali Dehghani, and Saeed Farrokhpay. "Estimating Bubble Loading in Industrial Flotation Cells." Minerals 9, no. 4 (2019): 222. http://dx.doi.org/10.3390/min9040222.

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Bubble loading is the ratio of the weight of the solid particles to the bubble’s surface, and it has an effective role in the flotation efficiency. This paper investigates bubble loading an industrial processing circuit through considering the important role of the bubble diameter in calculating bubble loading, and the effect of the aeration rate and frother dosage on the bubble diameter. The ratio of the weight of solid particles to the bubble volume was estimated to be in the range of 8 to 24 g/L. Although increasing the aeration could result in increasing the weight of the particles attache

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14

Gvozdić, Biljana, Elise Alméras, Varghese Mathai, et al. "Experimental investigation of heat transport in homogeneous bubbly flow." Journal of Fluid Mechanics 845 (April 20, 2018): 226–44. http://dx.doi.org/10.1017/jfm.2018.213.

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We present results on the global and local characterisation of heat transport in homogeneous bubbly flow. Experimental measurements were performed with and without the injection of ${\sim}2.5~\text{mm}$ diameter bubbles (corresponding to bubble Reynolds number $Re_{b}\approx 600$) in a rectangular water column heated from one side and cooled from the other. The gas volume fraction $\unicode[STIX]{x1D6FC}$ was varied in the range 0 %–5 %, and the Rayleigh number $Ra_{H}$ in the range $4.0\times 10^{9}{-}1.2\times 10^{11}$. We find that the global heat transfer is enhanced up to 20 times due to

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15

CALDIROLI, PAOLO, and ROBERTA MUSINA. "EXISTENCE OF MINIMAL H-BUBBLES." Communications in Contemporary Mathematics 04, no. 02 (2002): 177–209. http://dx.doi.org/10.1142/s021919970200066x.

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Given a function H ∈ C1 (ℝ3) asymptotic to a constant at infinity, we investigate the existence of H-bubbles, i.e., nontrivial, conformal surfaces parametrized by the sphere, with mean curvature H. Under some global hypotheses we prove the existence of H-bubbles with minimal energy.

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16

Kerboua, Kaouther, Oualid Hamdaoui, and Abdulaziz Alghyamah. "Numerical Characterization of Acoustic Cavitation Bubbles with Respect to the Bubble Size Distribution at Equilibrium." Processes 9, no. 9 (2021): 1546. http://dx.doi.org/10.3390/pr9091546.

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In addition to bubble number density, bubble size distribution is an important population parameter governing the activity of acoustic cavitation bubbles. In the present paper, an iterative numerical method for equilibrium size distribution is proposed and combined to a model for bubble counting, in order to approach the number density within a population of acoustic cavitation bubbles of inhomogeneous sizing, hence the sonochemical activity of the inhomogeneous population based on discretization into homogenous groups. The composition of the inhomogeneous population is analyzed based on cavit

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17

Zhang, Xin, Jia Bao Sun, Chao Tian, Tielu Liu, and Chao Zhao. "Study on the Mechanism of Bubble Defects in the PECVD Amorphous Silicon Films on Dielectric Substrate." Key Engineering Materials 994 (November 5, 2024): 55–60. http://dx.doi.org/10.4028/p-112ixc.

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The amorphous silicon (a-Si) grown by plasma enhanced chemical vapor deposition (PECVD) has been widely applied in advanced semiconductor devices. However, it still suffers from the bubble defects when the deposition temperature goes above 450 °C. In this work, we have investigated the influence of underlying materials on the formation of bubbles of a-Si. The a-Si was deposited on different dielectric substrates, including silicon nitrides (SiN) and silicon dioxide (SiO2), using PECVD technique at a substrate temperature of 500 °C. A large number of bubbles of the a-Si has been observed on the

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18

Yasui, Kyuichi. "The Reducing Agents in Sonochemical Reactions without Any Additives." Molecules 28, no. 10 (2023): 4198. http://dx.doi.org/10.3390/molecules28104198.

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It has been experimentally reported that not only oxidation reactions but also reduction reactions occur in aqueous solutions under ultrasound without any additives. According to the numerical simulations of chemical reactions inside an air or argon bubble in water without any additives under ultrasound, reducing agents produced from the bubbles are H, H2, HO2 (which becomes superoxide anion (O2−) in liquid water), NO, and HNO2 (which becomes NO2− in liquid water). In addition, H2O2 sometimes works as a reducing agent. As the reduction potentials of H and H2 (in strongly alkaline solutions for

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19

Skogland, Steffen, Kåre Segadal, Harald Sundland, and Arvid Hope. "Gas bubbles in rats after heliox saturation and different decompression steps and rates." Journal of Applied Physiology 92, no. 6 (2002): 2633–39. http://dx.doi.org/10.1152/japplphysiol.00795.2001.

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Effects of pressure reduction, decompression rate, and repeated exposure on venous gas bubble formation were determined in five groups (GI, GII, GIII, GIV, and GV) of conscious and freely moving rats in a heliox atmosphere. Bubbles were recorded with a Doppler ultrasound probe implanted around the inferior caval vein. Rats were held for 16 h at 0.4 MPa (GI), 0.5 MPa (GII and GIII), 1.7 MPa (GIVa), or 1.9 MPa (GIV and GV), followed by decompression to 0.1 MPa in GI to GIII and to 1.1 MPa in GIV and GV. A greater decompression step, but at the same rate (GII vs. GI and GIVb vs. GIVa), resulted i

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20

Myers, S. M., T. J. Headley, C. R. Hills, et al. "The Behavior of Ion-Implanted Hydrogen in Gallium Nitride." MRS Internet Journal of Nitride Semiconductor Research 4, S1 (1999): 532–41. http://dx.doi.org/10.1557/s1092578300003008.

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Hydrogen was ion-implanted into wurtzite-phase GaN, and its transport, bound states, and microstructural effects during annealing up to 980°C were investigated by nuclear-reaction profiling, ion-channeling analysis, transmission electron microscopy, and infrared (IR) vibrational spectroscopy. At implanted concentrations ∧1 at.%, faceted H2 bubbles formed, enabling identification of energetically preferred surfaces, examination of passivating N-H states on these surfaces, and determination of the diffusivity-solubility product of the H. Additionally, the formation and evolution of point and ext

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21

Ghara, Raghunath, and T. Roy Choudhury. "Bayesian approach to constraining the properties of ionized bubbles during reionization." Monthly Notices of the Royal Astronomical Society 496, no. 1 (2020): 739–53. http://dx.doi.org/10.1093/mnras/staa1599.

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ABSTRACT A possible way to study the reionization of cosmic hydrogen is by observing the large ionized regions (bubbles) around bright individual sources, e.g. quasars, using the redshifted 21 cm signal. It has already been shown that matched filter-based methods are not only able to detect the weak 21 cm signal from these bubbles but also aid in constraining their properties. In this work, we extend the previous studies to develop a rigorous Bayesian framework to explore the possibility of constraining the parameters that characterize the bubbles. To check the accuracy with which we can recov

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22

Heiles, Carl. "Clustered Supernovae vs. The Gaseous Disk and Halo: A Rematch." International Astronomical Union Colloquium 120 (1989): 484–93. http://dx.doi.org/10.1017/s0252921100024295.

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ABSTRACT.Recent developments, both observational and theoretical, require a reevaluation of the effects of clustered supernovae on the two-dimensional porosity parameter Q2D and the rates of mass injection into the halo Ṁ of both cold and hot gas. Clustered supernovae produce two types of bubble. Most clusters produce breakthrough bubbles, which do no more than break through the dense gas disk. But large clusters produce enough energy to make blowout bubbles, which blow gas up into the halo. We calculate area filling factors and mass injection rates into the halo for different types of galaxy.

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23

Ham, Phaly, Saret Bun, Pisut Painmanakul, and Kritchart Wongwailikhit. "Effective Analysis of Different Gas Diffusers on Bubble Hydrodynamics in Bubble Column and Airlift Reactors towards Mass Transfer Enhancement." Processes 9, no. 10 (2021): 1765. http://dx.doi.org/10.3390/pr9101765.

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Even bubble column reactors (BCR) and airlift reactors (ALR) have been developed in terms of various related aspects towards mass transfer enhancement, the effective analysis of gas diffuser types on mass transfer and gas–liquid hydrodynamic characteristics is still limited. Therefore, the present study aims to analyze the relative effect of different types of air diffusers on bubble hydrodynamics and mass transfer performance to understand their behaviors and define the best type. The experiments were conducted by varying different diffuser types, reactor types (BCR and ALR), and superficial

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24

Yuan, Bo, and Qunzhi Zhu. "Evaporation of nanofluid with induced bubbles under sun illumination." Journal of Physics: Conference Series 2566, no. 1 (2023): 012103. http://dx.doi.org/10.1088/1742-6596/2566/1/012103.

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Abstract Recently, various nanofluids have been explored to facilitate vapor production, showing the great efficacy of such fluids in solar evaporation. Plasmonic nanofluid generally requires high concentrations or mixing of individual nanofluids to achieve efficient evaporation. In contrast, carbon-based nanofluid, by its very nature, can achieve broad-spectrum absorption and require only very low concentrations. In this work, we introduce air bubbles within the carbon-based nanofluid to facilitate vapor evaporation. The dynamic bubbles effectively extend the incident light path and provide a

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25

Zhang, Jingjing, Tengfei Zheng, Lin Tang, Hui Qi, Xiaoyu Wu, and Linlong Zhu. "Bubble-Enhanced Mixing Induced by Standing Surface Acoustic Waves (SSAWs) in Microchannel." Micromachines 13, no. 8 (2022): 1337. http://dx.doi.org/10.3390/mi13081337.

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BAW-based micromixers usually achieve mixing enhancement with acoustic-induced bubbles, while SAW-based micromixers usually enhance mixing efficiency by varying the configuration of IDTs and microchannels. In this paper, bubble-enhanced acoustic mixing induced by standing surface acoustic waves (SSAWs) in a microchannel is proposed and experimentally demonstrated. Significant enhancement in the mixing efficiency was achieved after the bubbles were stimulated in our acoustofluidic microdevice. With an applied voltage of 5 V, 50 times amplified, the proposed mixing microdevice could achieve 90.8

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Zhang, Zhenming, Peng Ma, Jianhong Dong, Min Liu, Yonggang Liu, and Chaobin Lai. "Effects of Different RH Degasser Nozzle Layouts on the Circulating Flow Rate." Materials 15, no. 23 (2022): 8476. http://dx.doi.org/10.3390/ma15238476.

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The effects of gas flow rate and 22 kinds of nozzle layouts on the circulation flow rate were researched during the RH refining process using a water model and a mathematical model. Numerical simulations agreed with the water model experiment well. The results showed that the circulating flow rate increased with an increase of the gas flow rate. The critical value of the gas flow rate was 2.4 m3/h. Out of the 22 kinds of layouts, the 127-87 symmetrical layout was the optimal layout, for which the circulating flow rate reached 29.8 m3/h, the area of blind zone was the smallest and the mixing ef

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27

Gao, Jialiang, Gang Wang, Jitong Li, et al. "Design and Verification of Experimental Device for Pressurized Bubbling Absorption and Transport Characteristics in Vacuum Environment." Buildings 14, no. 6 (2024): 1685. http://dx.doi.org/10.3390/buildings14061685.

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To explore the dynamics of flow and heat transfer behaviors associated with bubbles during solution absorption in a vacuum environment, we present the design of an experimental setup for measuring the absorption and transport properties of bubbles in a pressurized vertical tube. The structure and operational principle of the setup are detailed. The reliability and accuracy of the system are validated through a series of experiments, including vacuum level maintenance, bubble flow verification, and energy checks. The findings reveal that the supercharging technology effectively facilitates bubb

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Shimabukuro, Hayato, Yi Mao, and Jianrong Tan. "Estimation of H ii Bubble Size Distribution from 21 cm Power Spectrum with Artificial Neural Networks." Research in Astronomy and Astrophysics 22, no. 3 (2022): 035027. http://dx.doi.org/10.1088/1674-4527/ac4ca3.

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Abstract The bubble size distribution of ionized hydrogen regions probes information about the morphology of H II bubbles during reionization. Conventionally, the H II bubble size distribution can be derived from the tomographic imaging data of the redshifted 21 cm signal from the epoch of reionization, which, however, is observationally challenging even for upcoming large radio interferometer arrays. Given that these interferometers promise to measure the 21 cm power spectrum accurately, we propose a new method, which is based on artificial neural networks, to reconstruct the H II bubble size

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Liu, Xiao, Huaican Chen, Jianfei Tong, et al. "The Kinetic Behaviors of H Impurities in the Li/Ta Bilayer: Application for the Accelerator-Based BNCT." Nanomaterials 9, no. 8 (2019): 1107. http://dx.doi.org/10.3390/nano9081107.

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Hydrogen bubble phenomenon is one of the key issues to be solved in the development of a long-life target system for boron neutron capture therapy (BNCT). In this study, we assessed the kinetic behaviors of H impurities in the nano-composite target from the atomic level. Firstly, two kinds of Li/Ta nanolayer models were constructed, based on the calculated lattice parameters and surface energies. The H solution energy, diffusion mechanism, and hydrogen bubbles formation in the Li/Ta nanostructured bilayer were studied, through theoretical modeling and simulation. Our results show that the Li/T

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Barnes, Ashley T., Elizabeth J. Watkins, Sharon E. Meidt, et al. "PHANGS–JWST First Results: Multiwavelength View of Feedback-driven Bubbles (the Phantom Voids) across NGC 628." Astrophysical Journal Letters 944, no. 2 (2023): L22. http://dx.doi.org/10.3847/2041-8213/aca7b9.

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Abstract We present a high-resolution view of bubbles within the Phantom Galaxy (NGC 628), a nearby (∼10 Mpc), star-forming (∼2 M ⊙ yr−1), face-on (i ∼ 9°) grand-design spiral galaxy. With new data obtained as part of the Physics at High Angular resolution in Nearby GalaxieS (PHANGS)-JWST treasury program, we perform a detailed case study of two regions of interest, one of which contains the largest and most prominent bubble in the galaxy (the Phantom Void, over 1 kpc in diameter), and the other being a smaller region that may be the precursor to such a large bubble (the Precursor Phantom Void

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Yusefi, Hossein, and Brandon Helfield. "Investigating the resonance response of a system of two ultrasound-driven lipid encapsulated microbubbles." Journal of the Acoustical Society of America 151, no. 4 (2022): A110. http://dx.doi.org/10.1121/10.0010813.

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Ultrasound-stimulated microbubbles are clinical imaging agents and being developed for therapeutic applications. Here, we aim to understand the behaviour of two individual phospholipid-encapsulated microbubbles in close proximity to each other, typically the case given clinical doses. We developed a finite element model to study the radial resonance response of each microbubble within a two-microbubble system from 1–8 MHz with bubble diameters ranging from 2 to 4 μm, bubble center-to-center distances h = 8–24 μm, and peak-negative pressures of 30–45 kPa. For two identical microbubbles, our res

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Bordoloi, Rongmon, Andrew J. Fox, and Felix J. Lockman. "A New High-latitude H i Cloud Complex Entrained in the Northern Fermi Bubble." Astrophysical Journal Letters 987, no. 2 (2025): L32. https://doi.org/10.3847/2041-8213/addd16.

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Abstract We report the discovery of 11 high-velocity H i clouds at Galactic latitudes of 25°–30°, likely embedded in the Milky Way’s nuclear wind. The clouds are detected with deep Green Bank Telescope 21 cm observations of a 3 . ° 2 × 6 . ° 2 field around QSO 1H1613-097, located behind the northern Fermi Bubble. Our measurements reach 3σ limits on N HI as low as 3.1 × 1017 cm−2, more than twice as sensitive as previous H i studies of the bubbles. The clouds span −180 ≤ v LSR ≤ −90 km s−1 and are the highest-latitude 21 cm high-velocity cloud detected inside the bubbles. Eight clouds are spati

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Nazari, Sabereh, Sied Ziaedin Shafaei, Mahdi Gharabaghi, Rahman Ahmadi, Behzad Shahbazi, and Arash Tehranchi. "New Approach to Quartz Coarse Particles Flotation Using Nanobubbles, with Emphasis on the Bubble Size Distribution." International Journal of Nanoscience 19, no. 01 (2019): 1850048. http://dx.doi.org/10.1142/s0219581x18500485.

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This study investigates the influence of bubble size distribution and operational parameters on the flotation behavior of quartz coarse particles. The parameters evaluated during this study include the different bubble size distribution, air flow rate and impeller speed. Experiments were conducted at three different bubble sizes: 110, 171 and 293[Formula: see text]nm as db(32). Then, the results were compared with common air bubbles of the conventional flotation process. The bubble size distribution was measured using a laser particle size analyzer (LPSA). Results showed that the recovery of [

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Paskevicius, M., and C. E. Buckley. "Analysis of polydisperse bubbles in the aluminium–hydrogen system using a size-dependent contrast." Journal of Applied Crystallography 39, no. 5 (2006): 676–82. http://dx.doi.org/10.1107/s0021889806032407.

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The characterization of hydrogen defects in an aluminium–hydrogen system was performed previously [Buckleyet al.(2001).J. Appl. Cryst.34, 119–129] using small-angle scattering, inelastic neutron scattering and electron microscopy techniques. This analysis resulted in the determination of the relative change in lattice parameter as a result of hydrogen introduction into the Al matrix. However, this method relied on the average volume of the bubbles of hydrogen and also the pressure in a bubble of average volume. The characterization of the Al–H system has been improved by considering the size p

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Zhou, Chang Chun. "Study of Strengthen Flotation Separation for Middle-Low Grade Bauxite." Advanced Materials Research 361-363 (October 2011): 844–47. http://dx.doi.org/10.4028/www.scientific.net/amr.361-363.844.

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The ore properties and strengthen separation of bauxite were studied in this paper. The parameters in strengthen separation, such as dosage of collectors, flotation turbulence and inflation etc., were also discussed. With the increase of collector dosage, the recovery of Al2O3increased.,When the collector dosage was 900 g/t, A/S of foam was 7.06 and the recovery was 86.39%. The recovery also increased with the increase of stirring speed. When the speed of agitation mixing impeller reached 1700 r/min, the recovery was 84.56% and A/S of concentrate was 6.71. With the increase of inflation, the n

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Hennig, D., J. F. R. Archilla, and J. M. Romero. "Modelling the thermal evolution of enzyme-created bubbles in DNA." Journal of The Royal Society Interface 2, no. 2 (2005): 89–95. http://dx.doi.org/10.1098/rsif.2004.0024.

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The formation of bubbles in nucleic acids (NAs) is fundamental in many biological processes such as DNA replication, recombination, telomere formation and nucleotide excision repair, as well as RNA transcription and splicing. These processes are carried out by assembled complexes with enzymes that separate selected regions of NAs. Within the frame of a nonlinear dynamics approach, we model the structure of the DNA duplex by a nonlinear network of coupled oscillators. We show that, in fact, from certain local structural distortions, there originate oscillating localized patterns, that is, radia

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Marks, Roman, and Piotr H. Pawłowski. "Rotational-electric principles of RNA/DNA and viability." AIMS Biophysics 10, no. 3 (2023): 385–400. http://dx.doi.org/10.3934/biophy.2023023.

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<abstract> <p>Photographic investigations of rising bubbles in seawater revealed that each bubble may conduct a single or bi-spiraling motion, which resemble architecture of RNA or DNA respectively. The rotational motion results from acceleration of ionic hydrates, which are separated to anionic and cationic domains at the upper and bottom curvatures of the bubble. Afterwards, rotational motion undergoes further acceleration in the bubble upper vortex, followed by deceleration at the vortex tip. During that phase, the spiraling motion cause significant friction that result in polar

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Fajarningrum, Nurmala Dyah, M. Fendy Kussuma Hadi Sufyan, Rizqa Ula Fahadha, Deendarlianto Deendarlianto, and Dedy Kurniawan. "Visualization of Two-Phase Flow Regime in Vertical Pipe Airlift pump." Jurnal Rekayasa Mesin 19, no. 1 (2024): 85–94. https://doi.org/10.32497/jrm.v19i1.5136.

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An airlift pump can be used to move from one location to another. The pump lifts liquid or solid particles from air bubbles through a vertical pipe. In this experiment, the airlift pump system was modified using a microbubble generator installed on the injector to produce air bubbles. Two injectors were installed with a swirl model. This study aims to visualise the flow pattern that forms in a vertical pipe when air bubbles lift water toward the endpoint. The flow pattern was observed by varying airspeed and water column h in the vertical pipe. The method in this study was carried out using a

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Duplat, Jérôme. "Dynamics of expansion and collapse of explosive two-dimensional bubbles." Journal of Fluid Mechanics 859 (November 22, 2018): 677–90. http://dx.doi.org/10.1017/jfm.2018.804.

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An explosive gas mixture of hydrogen and oxygen is introduced in liquid water between two horizontal walls, forming a flat cylindrical bubble. Ignition and explosion of the bubble lead to a large depressurized cavity that finally implodes. We investigate the dynamics of the bubble collapse, which is qualitatively similar to the collapse of a spherical bubble. It exhibits a slightly weaker singularity than for spherical bubbles. We also analyse the explosion process. Starting with an initial radius $R_{0}$, the bubble reaches a maximal radius $R_{max}$ that depends on the gap thickness $h$ betw

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Caldiroli, Paolo. "H-bubbles with prescribed large mean curvature." manuscripta mathematica 113, no. 1 (2004): 125–42. http://dx.doi.org/10.1007/s00229-003-0427-8.

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Yeom, Geum-Su. "Correlations and Asymptotic Behaviors of the Shape Parameters of Floating Bubbles Using an Improved Numerical Procedure." Applied Sciences 12, no. 4 (2022): 1804. http://dx.doi.org/10.3390/app12041804.

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An improved numerical procedure is used to present the correlations between the shape parameters and Bond numbers of floating bubbles for a wider range of Bond numbers (5×10−5<Bo<5000) than the previously reported range of Bond numbers (0.003<Bo<241), and their asymptotic relations as Bo → 0 and Bo → ∞. The proposed method is proven to be more precise and robust than the conventional methods in comparison with previous numerical and experimental results. In addition, the profile of floating bubbles and the related parameters are presented for a wide range of bubble sizes. The shape

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Liu, Gang, Qiang Fu, and Junjun Kang. "Cavitation and Negative Pressure: A Flexible Water Model Molecular Dynamics Simulation." International Journal of Statistics and Probability 8, no. 2 (2019): 172. http://dx.doi.org/10.5539/ijsp.v8n2p172.

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The critical negative pressure for cavitation in water has been theoretically predicted to be in the range of -100 to -200 MPa at room temperature, whereas values around -30 MPa have been obtained by many experiments. The discrepancy has yet to be resolved. Molecular dynamics (MD) is an effective method of observing bubble nucleation, however, most MD simulations use a rigid water model and do not take the effects of intermolecular vibrations into account. In this manuscript we perform MD simulations to study cavitation in water by using a TIP4P/2005f model under volumecontrolled stretching. I

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Filella, Audrey, Patricia Ern, and Véronique Roig. "Oscillatory motion and wake of a bubble rising in a thin-gap cell." Journal of Fluid Mechanics 778 (July 30, 2015): 60–88. http://dx.doi.org/10.1017/jfm.2015.355.

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We investigate the characteristics of the oscillatory motion and wake of confined bubbles freely rising in a thin-gap cell ($h=3.1~\text{mm}$ width). Once the diameter $d$ of the bubble in the plane of the cell is known, the mean vertical velocity of the bubble $V_{b}$ is proportional to the gravitational velocity $(h/d)^{1/6}\sqrt{gd}$, where $g$ is the gravitational acceleration. This velocity is used to build the Reynolds number $Re=V_{b}d/{\it\nu}$ that characterizes the flow induced by the bubble in the surrounding liquid (of kinematic viscosity ${\it\nu}$), and which determines at leadin

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Trott, C. M., C. H. Jordan, J. L. B. Line, et al. "Constraining the 21 cm brightness temperature of the IGM at z = 6.6 around LAEs with the murchison widefield array." Monthly Notices of the Royal Astronomical Society 507, no. 1 (2021): 772–80. http://dx.doi.org/10.1093/mnras/stab2235.

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ABSTRACT The locations of Ly α-emitting galaxies (LAEs) at the end of the Epoch of Reionization (EoR) are expected to correlate with regions of ionized hydrogen, traced by the redshifted 21 cm hyperfine line. Mapping the neutral hydrogen around regions with detected and localized LAEs offers an avenue to constrain the brightness temperature of the Universe within the EoR by providing an expectation for the spatial distribution of the gas, thereby providing prior information unavailable to power spectrum measurements. We use a test set of 12 h of observations from the Murchison Widefield Array

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Sandin, Christer, Matthias Steffen, Ralf Jacob, et al. "The role of heat conduction to the formation of [WC]-type planetary nebulae." Proceedings of the International Astronomical Union 7, S283 (2011): 494–95. http://dx.doi.org/10.1017/s1743921312012094.

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AbstractX-ray observations of young Planetary Nebulæ (PNe) have revealed diffuse emission in extended regions around both H-rich and H-deficient central stars. In order to also reproduce physical properties of H-deficient objects, we have, at first, extended our time-dependent radiation-hydrodynamic models with heat conduction for such conditions. Here we present some of the important physical concepts, which determine how and when a hot wind-blown bubble forms. In this study we have had to consider the, largely unknown, evolution of the CSPN, the slow (AGB) wind, the fast hot-CSPN wind, and t

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Jinno, Ryusuke, Thomas Konstandin, Henrique Rubira, and Jorinde van de Vis. "Effect of density fluctuations on gravitational wave production in first-order phase transitions." Journal of Cosmology and Astroparticle Physics 2021, no. 12 (2021): 019. http://dx.doi.org/10.1088/1475-7516/2021/12/019.

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Abstract We study the effect of density perturbations on the process of first-order phase transitions and gravitational wave production in the early Universe. We are mainly interested in how the distribution of nucleated bubbles is affected by fluctuations in the local temperature. We find that large-scale density fluctuations (H * < k * < β) result in a larger effective bubble size at the time of collision, enhancing the produced amplitude of gravitational waves. The amplitude of the density fluctuations necessary for this enhancement is 𝒫ζ (k *) ≳ (β/H *)-2, and therefore the gravitati

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Thom, Stephen R., Tatyana N. Milovanova, Marina Bogush, et al. "Bubbles, microparticles, and neutrophil activation: changes with exercise level and breathing gas during open-water SCUBA diving." Journal of Applied Physiology 114, no. 10 (2013): 1396–405. http://dx.doi.org/10.1152/japplphysiol.00106.2013.

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The study goal was to evaluate responses in humans following decompression from open-water SCUBA diving with the hypothesis that exertion underwater and use of a breathing mixture containing more oxygen and less nitrogen (enriched air nitrox) would alter annexin V-positive microparticle (MP) production and size changes and neutrophil activation, as well as their relationships to intravascular bubble formation. Twenty-four divers followed a uniform dive profile to 18 m of sea water breathing air or 22.5 m breathing 32% oxygen/68% nitrogen for 47 min, either swimming with moderately heavy exerti

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Kang, Shu Mei, Ming Gang Shen, and Cheng Wei Li. "Cold Model Experiments and Mechanism on Inclusion Removal by Ultrasonic Horn." Advanced Materials Research 750-752 (August 2013): 404–7. http://dx.doi.org/10.4028/www.scientific.net/amr.750-752.404.

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The effect of power and tool rod position on inclusion removal was studied in the ladle refining cold model when the organic particles were used to imitate the inclusion. The mechanism of removing inclusion by cavitation bubbles was investigated. Both the transient bubbles and stable bubbles can promote the removal of inclusion; as the power increase, cavitation intensity increases, the number of cavitation bubbles increases, the collision probability of the cavitation bubbles increases with the inclusion, the efficiency of removing inclusion increases; as the wave source into the liquid is 1/

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Frigeri, Cesare, L. Nasi, M. Serényi, A. Csik, Z. Erdélyi, and Dezső L. Beke. "Influence of Hydrogen on the Structural Stability of Annealed Ultrathin Si/Ge Amorphous Layers." Solid State Phenomena 156-158 (October 2009): 325–30. http://dx.doi.org/10.4028/www.scientific.net/ssp.156-158.325.

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The influence of hydrogen on the structural stability of multilayers made of ultrathin (3 nm) Si and Ge amorphous layers submitted to annealing to activate Si and Ge intermixing has been studied by TEM and AFM. By energy dispersive microanalysis the interdiffusion of Si and Ge has been observed. The Si/Ge multilayers, however, underwent remarkable structural degradation because of the formation of hydrogen bubbles which give rise to surface bumps and eventually craters when the bubbles blow up because of too high internal pressure in samples with high H content and annealed at high temperature

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Wilbur, J. C., S. D. Phillips, T. G. Donoghue, et al. "Signals consistent with microbubbles detected in legs of normal human subjects after exercise." Journal of Applied Physiology 108, no. 2 (2010): 240–44. http://dx.doi.org/10.1152/japplphysiol.00615.2009.

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Exercise may produce micronuclei (presumably gas-filled bubbles) in tissue, which could serve as nucleation sites for bubbles during subsequent decompression stress. These micronuclei have never been directly detected in humans. Dual-frequency ultrasound (DFU) is a resonance-based, ultrasound technique capable of detecting and sizing small stationary bubbles. We surveyed for bubbles in the legs of six normal human subjects (ages 28–52 yr) after exercise using DFU. Eleven marked sites on the left thigh and calf were imaged using standard imaging ultrasound. Subjects then rested in a reclining c

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