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Journal articles on the topic 'Thermal condensations'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Hood, A., and U. Anzer. "Thermal condensations in coronal magnetic fields." Solar Physics 115, no. 1 (1988): 61–80. http://dx.doi.org/10.1007/bf00146230.

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Kohutova, P., P. Antolin, A. Popovas, M. Szydlarski, and V. H. Hansteen. "Self-consistent 3D radiative magnetohydrodynamic simulations of coronal rain formation and evolution." Astronomy & Astrophysics 639 (July 2020): A20. http://dx.doi.org/10.1051/0004-6361/202037899.

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Context. Coronal rain consists of cool and dense plasma condensations formed in coronal loops as a result of thermal instability. Aims. Previous numerical simulations of thermal instability and coronal rain formation have relied on the practice of artificially adding a coronal heating term to the energy equation. To reproduce large-scale characteristics of the corona, the use of more realistic coronal heating prescription is necessary. Methods. We analysed coronal rain formation and evolution in a three-dimensional radiative magnetohydrodynamic simulation spanning from convection zone to coron

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Donné, D., and R. Keppens. "Mass Cycle and Dynamics of a Virtual Quiescent Prominence." Astrophysical Journal 971, no. 1 (2024): 90. http://dx.doi.org/10.3847/1538-4357/ad50a3.

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Abstract The mass cycle of solar prominences or filaments is still not completely understood. Researchers agree that these dense structures form by coronal in situ condensations and plasma siphoning from the underlying chromosphere. In the evaporation–condensation model siphoning arises due to evaporation of chromospheric plasma from localized footpoint heating, but this is challenging to justify observationally. Here, we simulate the reconnection–condensation model at extreme resolutions down to 20.8 km within a three-dimensional (3D) magnetohydrodynamic coronal volume. We form a draining, qu

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Kucera, Therese A., James A. Klimchuk, and Manuel Luna. "Modeling of Condensations in Coronal Loops Produced by Impulsive Heating with Variable Frequencies and Locations." Astrophysical Journal 965, no. 1 (2024): 53. http://dx.doi.org/10.3847/1538-4357/ad25fc.

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Abstract We present the results of models of impulsively heated coronal loops using the 1D hydrodynamic Adaptively Refined Godunov Solver code. The impulsive heating events (which we refer to as nanoflares) are modeled by discrete pulses of energy along the loop. We explore the occurrence of cold condensations due to the effective equivalent of thermal nonequilibrium in loops with steady heating, and examine its dependence on nanoflare timing and intensity and also nanoflare location along the loop, including randomized distributions of nanoflares. We find that randomizing the distribution of

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Kohutova, P., E. Verwichte, and C. Froment. "Formation of coronal rain triggered by impulsive heating associated with magnetic reconnection." Astronomy & Astrophysics 630 (October 2019): A123. http://dx.doi.org/10.1051/0004-6361/201936253.

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Context. Coronal rain consists of cool plasma condensations formed in coronal loops as a result of thermal instability. The standard models of coronal rain formation assume that the heating is quasi-steady and localised at the coronal loop footpoints. Aims. We present an observation of magnetic reconnection in the corona and the associated impulsive heating triggering formation of coronal rain condensations. Methods. We analyse combined SDO/AIA and IRIS observations of a coronal rain event following a reconnection between threads of a low-lying prominence flux rope and surrounding coronal fiel

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6

Johnston, Craig D., Lars K. S. Daldorff, Peter W. Schuck, et al. "Filament Mass Losses Forced by Magnetic Reconnection in the Solar Corona." Astrophysical Journal 982, no. 2 (2025): 131. https://doi.org/10.3847/1538-4357/adbae8.

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Abstract Recent observations of the solar atmosphere in cool extreme-ultraviolet lines have reported the prevalence of coronal rain falling from coronal cloud filaments that are associated with the magnetic dips of coronal X-point structures. These filaments mysteriously appear as clouds of mass in the corona that subsequently shrink and disappear due to mass losses that drain as coronal rain along arced field lines. Using a two-and-a-half-dimensional magnetohydrodynamic model, we investigated evaporation-condensation as the formation mechanism of the subset of coronal cloud filaments that for

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Claes, N., and R. Keppens. "Thermal stability of magnetohydrodynamic modes in homogeneous plasmas." Astronomy & Astrophysics 624 (April 2019): A96. http://dx.doi.org/10.1051/0004-6361/201834699.

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Context. Thermal instabilities give rise to condensations in the solar corona, and are the most probable scenario for coronal rain and prominence formation. We revisit the original theoretical treatment done by Field (1965, ApJ, 142, 531) in a homogeneous plasma with heat-loss effects and combine this with state-of-the-art numerical simulations to verify growth-rate predictions and address the long-term non-linear regime. We especially investigate interaction between multiple magnetohydrodynamic (MHD) wave modes and how they in turn trigger thermal mode development. Aims. We assess how well th

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Bak, Dongsu, and Sangheon Yun. "Thermal aspects of the ABJM theory: currents and condensations." Classical and Quantum Gravity 27, no. 21 (2010): 215011. http://dx.doi.org/10.1088/0264-9381/27/21/215011.

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9

Chu, H., Y. C. Chang, H. Umezawa, and F. C. Khanna. "Boson condensations in real time thermal quantum field theory." Physics Letters A 201, no. 4 (1995): 353–58. http://dx.doi.org/10.1016/0375-9601(95)00290-j.

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10

Glumac, N. G., Y.-J. Chen, and G. Skandan. "Diagnostics and Modeling of Nanopowder Synthesis in Low Pressure Flames." Journal of Materials Research 13, no. 9 (1998): 2572–79. http://dx.doi.org/10.1557/jmr.1998.0359.

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Laser-induced fluorescence, thermophoretic sampling, laser light scattering, and emission spectroscopy have been used to probe low pressure hydrogen/oxygen flames in which 3–50 nm, loosely agglomerated oxide nanopowders have been synthesized at high production rates by the pyrolysis of precursor vapors, followed by condensation in the gas phase. These measurements have enabled the identification of pyrolysis, condensations, and particle growth regions in the flame. Flame simulations using a one-dimensional stagnation flow model, with complex chemistry, demonstrate that the chemical and thermal

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11

Li, Xiaohong, Rony Keppens, and Yuhao Zhou. "Coronal Rain in Randomly Heated Arcades." Astrophysical Journal 926, no. 2 (2022): 216. http://dx.doi.org/10.3847/1538-4357/ac41cd.

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Abstract Adopting the MPI-AMRVAC code, we present a 2.5-dimensional magnetohydrodynamic simulation, which includes thermal conduction and radiative cooling, to investigate the formation and evolution of the coronal rain phenomenon. We perform the simulation in initially linear force-free magnetic fields that host chromospheric, transition-region, and coronal plasma, with turbulent heating localized on their footpoints. Due to thermal instability, condensations start to occur at the loop top, and rebound shocks are generated by the siphon inflows. Condensations fragment into smaller blobs movin

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Abrahams, S. C., J. Ihringer, and P. Marsh. "Structural and thermal dependence of normal-mode condensations in K2TeBr6." Acta Crystallographica Section B Structural Science 45, no. 1 (1989): 26–34. http://dx.doi.org/10.1107/s0108768188010493.

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13

Bui, Dinh-Hoi, and Van-Nham Phan. "Thermal fluctuations in a system of microcavity exciton-polariton condensations." physica status solidi (b) 254, no. 2 (2016): 1600359. http://dx.doi.org/10.1002/pssb.201600359.

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14

Claes, N., R. Keppens, and C. Xia. "Thermal instabilities: Fragmentation and field misalignment of filament fine structure." Astronomy & Astrophysics 636 (April 2020): A112. http://dx.doi.org/10.1051/0004-6361/202037616.

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Context. Prominences show a surprising amount of fine structure and it is widely believed that their threads, as seen in Hα observations, provide indirect information concerning magnetic field topology. Both prominence and coronal rain condensations most likely originate from thermal instabilities in the solar corona. It is still not understood how non-linear instability evolution shapes the observed fine structure of prominences. Investigating this requires multidimensional, high-resolution simulations to resolve all emerging substructure in great detail. Aims. We investigate the spontaneous

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15

Phillips, G. J. "Fragmentation in Collapsing Magnetic Gas Clouds–Non-Uniform Initial Fields." Publications of the Astronomical Society of Australia 6, no. 2 (1985): 205–7. http://dx.doi.org/10.1017/s1323358000018105.

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It is widely believed that stars form from collapsing interstellar clouds. However, molecular clouds typically contain of the order of 103 solar masses. Thus a mechanism is required that allows a collapsing cloud to fragment into a number of collapsing stellar sized sub-condensations. The early work was based on a virial theorem approach—defining a critical mass a cloud must exceed in order for its gravitational force to overcome the resistive thermal, rotational and magnetic forces, thus allowing the cloud to collapse. This critical mass is analogous to the Jeans mass for non-rotating, non-ma

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Hayakawa, Eiji, and Shuji Himeno. "Preparation of Al-Containing ZSM-58 Zeolite Membranes Using Rapid Thermal Processing for CO2/CH4 Mixture Separation." Membranes 11, no. 8 (2021): 623. http://dx.doi.org/10.3390/membranes11080623.

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The synthesis of DDR-type zeolite membranes faces the problem of cracks that occur on the zeolite membrane due to differences in the thermal expansion coefficient between zeolite and the porous substrate during the detemplating process. In this study, Al-containing ZSM-58 zeolite membranes with DDR topology were prepared by rapid thermal processing (RTP), with the aim of developing a reproducible method for preparing DDR zeolite membrane without cracks. Moreover, we verified the influence of RTP before performing conventional thermal calcination (CTC) on ZSM-58 membranes with various silica-to

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17

Cherepanov, I. S. "Thermal and IR-Fourier transform spectroscopic study of water-soluble carbohydrate-arylamine condensation products in neutral media." Proceedings of the Voronezh State University of Engineering Technologies 81, no. 3 (2019): 213–16. http://dx.doi.org/10.20914/2310-1202-2019-3-213-216.

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Production of synthetic analogues of natural compounds, including high-molecular ones, as well as study of processes of their structure formation, is a pressing task of organic substances technology. To a large extent, this applies to synthetic humic substances, important products characterized by plant growth effect, chelating and other important properties. Simple carbohydrates and aromatic amines as oxygen and nitrogen-containing constituents during condensation in ethanol media produce water-fractionated products, the soluble fractions of which are studied herein by thermal degradation in

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18

van Hoven, G., L. Sparks, and T. Tachi. "Ideal condensations due to perpendicular thermal conduction in a sheared magnetic field." Astrophysical Journal 300 (January 1986): 249. http://dx.doi.org/10.1086/163799.

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19

Nejad-Asghar, Mohsen. "Formation of low-mass condensations in molecular cloud cores via thermal instability." Monthly Notices of the Royal Astronomical Society 414, no. 1 (2011): 470–78. http://dx.doi.org/10.1111/j.1365-2966.2011.18412.x.

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20

Nejad-Asghar, Mohsen, and Jamshid Ghanbari. "Formation of Small-Scale Condensations in the Molecular Clouds via Thermal Instability." Astrophysics and Space Science 302, no. 1-4 (2006): 243–51. http://dx.doi.org/10.1007/s10509-006-9049-4.

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21

Yang, Bo, Jiayan Yang, Yi Bi, Junchao Hong, and Zhe Xu. "Formation of a Solar Filament by Magnetic Reconnection, Associated Chromospheric Evaporation, and Subsequent Coronal Condensation." Astrophysical Journal Letters 921, no. 2 (2021): L33. http://dx.doi.org/10.3847/2041-8213/ac31b6.

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Abstract We present the first observation of a solar filament formed by magnetic reconnection, associated chromospheric evaporation, and subsequent coronal condensation. Driven by shearing motion during flux emergence, a sequential tether-cutting reconnection process occurred and resulted in an M1.3 confined flare accompanied by the formation of a sigmoid structure. It is found that the flare had conjugate compact footpoint brightenings, which correspond to the footpoints of the sigmoid. Furthermore, observational evidence of explosive evaporation is well diagnosed at the conjugate footpoint b

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22

Nejad-Asghar, M. "Global Thermal Instability in the Spherical Interstellar Clouds." Asian Journal of Research and Reviews in Physics 8, no. 4 (2024): 66–72. http://dx.doi.org/10.9734/ajr2p/2024/v8i4176.

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Thermal instability (TI) is a trigger mechanism, which can explain the formation of small condensations through some regions of the interstellar clouds. The instability criterion for flat geometry approximations has been investigated in previous works. Here, we focus on spherical perturbations in the spherical clouds. Our goal here is to examine the conditions for the occurrence of TI through the thermally dominated (i.e., gravitationally stable) quasi-static spherical interstellar clouds. First, we obtain the profiles of density, temperature, pressure, and enclosed mass of a symmetric spheric

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23

Marti, Josep, Luis F. Rodriguez, and Bo Reipurth. "Proper Motions of the Inner Condensations in the HH 80–81 Thermal Radio Jet." Astrophysical Journal 502, no. 1 (1998): 337–41. http://dx.doi.org/10.1086/305900.

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24

Jeffries, R. D. "Are there prominences around binary systems?" Symposium - International Astronomical Union 176 (1996): 461–68. http://dx.doi.org/10.1017/s0074180900083479.

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I examine the possibility that large, cool prominences can be formed in close binary systems, when coronal structures grow beyond the point where centrifugal force balances gravitational attraction. X-ray light curves of the eclipsing binary XY UMa indicate that an extended corona is probably present and this is likely to reach heights > 1.5 R⊙, where centrifugal compression may render plasma in the coronal loop apexes unstable to thermal perturbations. Cool condensations could form, explaining features such as the dips in the X-ray light curves of V471 Tau, and the circumstellar material d

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25

Zhou, Yuhao, Xiaohong Li, and Rony Keppens. "Frozen-field Modeling of Coronal Condensations with MPI-AMRVAC. I. Demonstration in Two-dimensional Models." Astrophysical Journal 968, no. 2 (2024): 123. http://dx.doi.org/10.3847/1538-4357/ad4466.

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Abstract Large-scale coronal plasma evolutions can be adequately described by magnetohydrodynamics (MHD) equations. However, full multidimensional MHD simulations require substantial computational resources. Given the low plasma β in the solar corona, in many coronal studies, it suffices to approximate the magnetic field to remain topologically fixed and effectively conduct one-dimensional (1D) hydrodynamic (HD) simulations instead. This approach is often employed in studies of coronal loops and their liability to form condensations related to thermal instability. While 1D HD simulations along

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26

Burdyuzha, V. V. "The development of modes of thermal instability in a non-stationary medium (production of OH maser condensations)." Symposium - International Astronomical Union 147 (1991): 211–14. http://dx.doi.org/10.1017/s0074180900239545.

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In a nonstationary medium (behind the shock front, for instance) the development of isobaric and adiabatic modes of the thermal instability are more preferable. Some examples of the fragmentation of the medium on clouds in case of OH masers are given.

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Burdyuzha, V. V. "The development of modes of thermal instability in a non-stationary medium (production of OH maser condensations)." Symposium - International Astronomical Union 147 (1991): 211–14. http://dx.doi.org/10.1017/s0074180900198924.

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In a nonstationary medium (behind the shock front, for instance) the development of isobaric and adiabatic modes of the thermal instability are more preferable. Some examples of the fragmentation of the medium on clouds in case of OH masers are given.

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28

Figueira, M., L. Bronfman, A. Zavagno, et al. "ALMA observations of RCW 120 Fragmentation at 0.01 pc scale." Astronomy & Astrophysics 616 (August 2018): L10. http://dx.doi.org/10.1051/0004-6361/201832930.

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Context. Little is known about how high-mass stars form. Around 30% of the young high-mass stars in the Galaxy are observed at the edges of ionized (H II) regions. Therefore these are places of choice to study the earliest stages of high-mass star formation, especially toward the most massive condensations. High spatial resolution observations in the millimeter range might reveal how these stars form and how they assemble their mass. Aims. We want to study the fragmentation process down to the 0.01 pc scale in the most massive condensation (1700 M⊙) observed at the southwestern edge of the H i

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29

Marti, J., L. F. Rodriguez, and Bo Reipurth. "Large Proper Motions and Ejection of New Condensations in the HH 80-81 Thermal Radio Jet." Astrophysical Journal 449 (August 1995): 184. http://dx.doi.org/10.1086/176044.

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30

FURUUCHI, KAZUYUKI. "MATRIX MODEL FOR POLYAKOV LOOPS, STRING FIELD THEORY IN THE TEMPORAL GAUGE AND WINDING STRING CONDENSATIONS IN ANTI-DE SITTER SPACE." Modern Physics Letters A 23, no. 17n20 (2008): 1565–76. http://dx.doi.org/10.1142/s0217732308027965.

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Closed string field theory is constructed by stochastically quantizing a matrix model for Polyakov loops that describes phases of a large N gauge theory at finite temperature. Coherent states in this string field theory describes winding string condensation which has been expected to cause topology change from thermal AdS geometry to AdS -Schwarzschild black hole geometry. D-branes in this closed string field theory is also discussed. Based on a talk given at CosPA 2007, Taipei.

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31

Alegre-Requena, Juan V., Marleen Häring, Isaac G. Sonsona, et al. "Synthesis and supramolecular self-assembly of glutamic acid-based squaramides." Beilstein Journal of Organic Chemistry 14 (August 6, 2018): 2065–73. http://dx.doi.org/10.3762/bjoc.14.180.

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We describe the preparation and characterization of two new unsymmetrical squaramide-based organogelators. The synthesis of the compounds was carried out by subsequent amine condensations starting from dimethyl squarate. The design of the gelators involved a squaramide core connected on one side to a long aliphatic chain and on the other side to a glutamic acid residue. The gelator bearing the free carboxylic groups showed a lower gelation capacity than its precursor diester derivative. Some selected gels were further studied by infrared spectroscopy, rheology and electron microscopy. Critical

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32

Barreira, Eva, and Vasco P. de Freitas. "The effect of nearby obstacles in surface condensations on external thermal insulation composite systems: Experimental and numerical study." Journal of Building Physics 37, no. 3 (2013): 269–95. http://dx.doi.org/10.1177/1744259113480132.

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33

Liu, Xiang-Long, Guang-Cai Gong, Heng-Sheng Cheng, and Li-Xing Ding. "Airflow and Heat Transfer in the Slot-Vented Room with Radiant Floor Heating Unit." Journal of Applied Mathematics 2012 (2012): 1–12. http://dx.doi.org/10.1155/2012/287271.

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Radiant floor heating has received increasing attention due to its diverse advantages, especially the energy saving as compared to the conventional dwelling heating system. This paper presents a numerical investigation of airflow and heat transfer in the slot-vented room with the radiant floor heating unit. Combination of fluid convection and thermal radiation has been implemented through the thermal boundary conditions. Spatial distributions of indoor air temperature and velocity, as well as the heat transfer rates along the radiant floor and the outer wall, have been presented and analyzed c

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34

Wang, Yuwei, Keping Qiu, Yue Cao, Yu Cheng, Junhao Liu, and Bo Hu. "Surveys of Clumps, Cores, and Condensations in Cygnus X. II. Radio Properties of Massive Dense Cores." Astrophysical Journal 927, no. 2 (2022): 185. http://dx.doi.org/10.3847/1538-4357/ac480a.

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Abstract We have carried out a high-sensitivity and high-resolution radio continuum study toward a sample of 47 massive dense cores (MDCs) in the Cygnus X star-forming complex using the Karl G. Jansky Very Large Array, aiming to detect and characterize the radio emission associated with star-forming activities down to ∼0.01 pc scales. We have detected 64 radio sources within or closely around the FWHMs of the MDCs, of which 37 are reported for the first time. The majority of the detected radio sources are associated with dust condensations embedded within the MDCs, and they are mostly weak and

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35

Berger, Thomas. "Solar Prominence Fine Structure and Dynamics." Proceedings of the International Astronomical Union 8, S300 (2013): 15–29. http://dx.doi.org/10.1017/s1743921313010697.

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AbstractWe review recent observational and theoretical results on the fine structure and dynamics of solar prominences, beginning with an overview of prominence classifications, the proposal of possible new “funnel prominence” classification, and a discussion of the recent “solar tornado” findings. We then focus on quiescent prominences to review formation, down-flow dynamics, and the “prominence bubble” phenomena. We show new observations of the prominence bubble Rayleigh-Taylor instability triggered by a Kelvin-Helmholtz shear flow instability occurring along the bubble boundary. Finally we

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36

Akabane, Kenji, Yoshiaki Sofue, Hisashi Hirabayashi, and Makoto Inoue. "Continuum Observations of M17, W49 A, and W5l A at 43 GHz." Publications of the Astronomical Society of Japan 41, no. 4 (1989): 809–22. https://doi.org/10.1093/pasj/41.4.809.

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Abstract In this paper 43.3-GHz continuum observations of the galactic H ii regions M17, W49 A, and W51 A are presented. Observations were made with a single-dish of 39" resolution, and the contour maps were compared with those of 3-mm wavelength results by Gordon et al. (1986; AAA 42.132.029). Each resolved area of the sources essentially shows a fairly reasonable thermal spectrum, though there is a weak millimeter-wave intensity excess in the near-south diffuse area of the M17 S-bar. An unfilled concentration of extremely compact and high-density ionized condensations is suggested in this hi

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Zhou, Yuhao, Xiaohong Li, Jack M. Jenkins, Jie Hong, and Rony Keppens. "Frozen-field Modeling of Coronal Condensations with MPI-AMRVAC. II. Optimization and Application in 3D Models." Astrophysical Journal 978, no. 1 (2024): 72. https://doi.org/10.3847/1538-4357/ad96af.

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Abstract The frozen-field hydrodynamic (ffHD) model is a simplification of the full magnetohydrodynamical equations under the assumption of a rigid magnetic field, which significantly reduces computational complexity and enhances efficiency. In this work, we combine the ffHD prescription with hyperbolic thermal conduction (TC) and the Transition Region Adaptive Conduction (TRAC) method to achieve further optimization. A series of 2D tests are done to evaluate the performance of the hyperbolic TC and the TRAC method. The results indicate that hyperbolic TC, while showing limiter-affected numeri

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Terradas, J., M. Luna, R. Soler, R. Oliver, M. Carbonell, and J. L. Ballester. "One-dimensional prominence threads." Astronomy & Astrophysics 653 (September 2021): A95. http://dx.doi.org/10.1051/0004-6361/202039905.

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Context. Threads are the building blocks of solar prominences and very often show longitudinal oscillatory motions that are strongly attenuated with time. The damping mechanism responsible for the reported oscillations is not fully understood yet. Aims. To understand the oscillations and damping of prominence threads we must first investigate the nature of the equilibrium solutions that arise under static conditions and under the presence of radiative losses, thermal conduction, and background heating. This provides the basis to calculate the eigenmodes of the thread models. Methods. The non-l

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Asatrian, A. S., A. R. Petrosian, and F. Börngen. "New Data on the Peculiar Galaxy MRK 273." International Astronomical Union Colloquium 124 (1990): 201–8. http://dx.doi.org/10.1017/s0252921100005108.

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AbstractOn the basis of direct UBV and spectral observations at Tautenburg (DDR) 2m and Special Observatory (USSR) 6m telescopes respectively the colorimetric and spectral investigations of the megamaser galaxy MRK 273 are carried out. It is seen that: MRK 273 is in a physical group of galaxies, which contains at least five members. Two bright central condensations of MRK 273 are Seyfert nuclei. The area of the main body of MRK 273 which contains both Seyfert nuclei and from which comes out a straight tail, is redder than the remaining part of the galaxy. The tail has a pronounced blue color a

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Esteban, Jesús, Pedro Yustos, and Miguel Ladero. "Catalytic Processes from Biomass-Derived Hexoses and Pentoses: A Recent Literature Overview." Catalysts 8, no. 12 (2018): 637. http://dx.doi.org/10.3390/catal8120637.

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Biomass is a plentiful renewable source of energy, food, feed and chemicals. It fixes about 1–2% of the solar energy received by the Earth through photosynthesis in both terrestrial and aquatic plants like macro- and microalgae. As fossil resources deplete, biomass appears a good complement and eventually a good substitute feedstock, but still needs the development of relatively new catalytic processes. For this purpose, catalytic transformations, whether alone or combined with thermal ones and separation operations, have been under study in recent years. Catalytic biorefineries are based on d

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Kim, Woong-Tae. "Disk Stability and Turbulence Generation: Effects of the Stellar Component." Proceedings of the International Astronomical Union 4, S254 (2008): 313–18. http://dx.doi.org/10.1017/s1743921308027749.

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AbstractGalactic disks consist of both stars and gas. The stars gravitationally influence the gas either in disks at large or within spiral arms, leading to the formation of giant clouds and turbulence driving in the gas. In featureless disks as in flocculent galaxies, swing amplification operating in a combined star-gas disk is efficient to form bound condensations and feed a significant level of random gas motions. This occurs when the gaseous Toomre parameter is less than 1.4 for the stellar parameters similar to the solar neighbourhood conditions. In disks with spiral features, on the othe

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Wolf, Kevin, Nicolas Bellouin, and Olivier Boucher. "Long-term upper-troposphere climatology of potential contrail occurrence over the Paris area derived from radiosonde observations." Atmospheric Chemistry and Physics 23, no. 1 (2023): 287–309. http://dx.doi.org/10.5194/acp-23-287-2023.

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Abstract. Condensations trails (or contrails) that form behind aircraft have been of climatic interest for many years; yet, their radiative forcing is still uncertain. A number of studies estimate the radiative impact of contrails to be similar to, or even larger than, that of CO2 emitted by aviation. Hence, contrail mitigation may represent a significant opportunity to reduce the overall climate effect of aviation. Here we analyze an 8-year data set of radiosonde observations from Trappes, France, in terms of the potential for contrail and induced cirrus formation. We focus on the contrail ve

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Liakh, Valeriia, and Rony Keppens. "Rotational Flows in Solar Coronal Flux Rope Cavities." Astrophysical Journal Letters 953, no. 1 (2023): L13. http://dx.doi.org/10.3847/2041-8213/acea78.

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Abstract We present a 2.5D magnetohydrodynamic simulation of a systematically rotating prominence inside its coronal cavity using the open-source MPI-AMRVAC code. Our simulation starts from a nonadiabatic, gravitationally stratified corona, permeated with a sheared arcade magnetic structure. The flux rope (FR) is formed through converging and shearing footpoints driving, simultaneously applying randomized heating at the bottom. The latter induces a left–right asymmetry of temperature and density distributions with respect to the polarity inversion line. This asymmetry drives flows along the lo

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Sanjiokumar, S. Rahangdale. "Thermal Degradation Study of Copolymer Resin Resulting From O-Toluidine, Biuret and Formaldehyde." International Journal of Advance and Applied Research 10, no. 5 (2023): 76–82. https://doi.org/10.5281/zenodo.8042481.

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The copolymer o-TBF has been synthesized by condensation of o-Toluidine and biuret with formaldehyde in the presence of hydrochloric acid as a catalyst in the 1: 1: 2 molar proportion of reactants. The thermal decomposition behavior of o-TBF copolymer has been carried out by using TGA in static nitrogen atmosphere at a heating rate of 10 0C/min. Sharp-Wentworth and Freeman-Carroll methods have been applied to calculatethe thermal activation energy(Ea), entropy change (∆S), apparent entropy change (S*), free energy change (∆F) and frequency factor (Z). The order of reaction (n) has been found t

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Tomisaka, Kohji. "Galactic Shock in Cloud Fluid and Its Gravitational Instability." Publications of the Astronomical Society of Japan 39, no. 1 (1987): 109–33. https://doi.org/10.1093/pasj/39.1.109.

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Abstract Based on the coagulation model of clouds, we study the response of the ensemble of clouds to the galactic spiral potential. We adopt the cloud fluid approximation in which each cloud is treated as a molecule in ordinary gas. The equations for the cloud fluid are modeled by taking into account the following processes: the formation and destruction of giant molecular clouds, the loss of random velocity due to mutual dissipative collisions, and the energy input by active star formation in giant molecular clouds. We show that the galactic shock is also formed in this cloud fluid. After th

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IIYAMA, Koji, Akiko KANEKO, Yutaka ABE, and Yutaka SUZUKI. "F106 STUDY ON THERMAL HYDRAULIC CHARACTERISTICS OF STEAM CONDENSATION IN MICROCHANNEL(Heat Exchanger)." Proceedings of the International Conference on Power Engineering (ICOPE) 2009.1 (2009): _1–323_—_1–328_. http://dx.doi.org/10.1299/jsmeicope.2009.1._1-323_.

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Varlamov, A. G., V. A. Kudryashov, A. N. Firsov, Yu M. Grigor'ev, and A. G. Merzhanov. "Condensation-thermal explosion." Combustion, Explosion, and Shock Waves 25, no. 5 (1989): 609–14. http://dx.doi.org/10.1007/bf00772978.

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Nejad-Asghar, M., and J. Soltani. "Evolution of density perturbations in a cylindrical molecular cloud using smoothed particle hydrodynamics." Serbian Astronomical Journal, no. 179 (2009): 61–67. http://dx.doi.org/10.2298/saj0979061n.

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Molecular clouds have a hierarchical structure from few tens of parsecs for giants to few tenth of a parsec for proto-stellar cores. Nowadays, our observational techniques are so advanced that it has become possible to detect the small-scale substructures inside the molecular cores. The question that arises is how these small condensations are formed. In the present research, we study the effect of ambipolar diffusion heating on the ubiquitous perturbations in a molecular cloud and investigate the possibility of converting them to dense substructures. For this purpose, a small azimuthal pertur

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Nomozov, Odiljon, and Feruza Mustafakulova. "INCREASING THERMAL PROTECTION OF ROOFING CONSTRUCTIONS OF RESIDENTIAL BUILDINGS." Zamonaviy dunyoda innovatsion tadqiqotlar: Nazariya va amaliyot, no. 10 (January 11, 2022): 9–12. https://doi.org/10.5281/zenodo.5837932.

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<strong>This article discusses the issues of protecting the attic floor of low-rise residential buildings from heat and cold, the disadvantages of materials used in the protection, improving the thermal insulation properties. Today in private housing construction, the construction of houses with mansard and mansard roofs is very popular. The issue of protection and ventilation of such roofs from heat and cold is raised separately.</strong>

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Labay, Volodymyr, and Halyna Vereshchynska. "METHOD OF ARRANGEMENT OF INTERNAL THERMAL INSULATION OF EXTERNAL PROTECTIVE STRUCTURES OF THE ROOM." Theory and Building Practice 2023, no. 2 (2023): 18–26. http://dx.doi.org/10.23939/jtbp2023.02.018.

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The paper presents the results of a study aimed at increasing energy efficiency in residential buildings, as well as an analysis of the humidity state and the possibility of condensation when using internal insulation. Numerical simulations were performed to confirm the results. The obtained results indicate that the use of mineral insulation "BETOL®" and aluminum foil used as a vapor barrier, applied from the inside, contributes to the improvement of thermal insulation of the walls and reduces the risks of condensation. Computer modeling showed that under the formed conditions, condensation i

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