We investigate the model of disk/coronal accretion into a black hole. We show that the inner regions of an accretion disk in X-ray binaries can transform from a cool standard disk to an advection-dominated flow through the known properties of Coulomb interaction in a two-temperature plasma, viscous heating, radiative processes, and ...
Energy Citations Database
The proposal, revived by Tremaine and Zytkow (1985), that accretion of comets by neutron stars may be the origin of gamma-ray bursts is considered. This mechanism has difficulty accounting for the observed gamma-ray spectrum and optical counterparts of the bursts. The survival of comets near supernovae is investigated. Ablation rates and the thermal ...
... Title : Evaluating Evaporation with Satellite Thermal Data. ... There should be good correlations between evaporation and surface temperatures. ...
DTIC Science & Technology
Thermal conduction between a cool accretion disk and a hot inner corona can result in either evaporation of the disk or condensation of the hot corona. At low mass accretion rates, evaporation dominates and can completely remove the inner disk. At higher mass accretion ...
NASA Astrophysics Data System (ADS)
We examine a new paradigm to account for the exponential decay seen in the light curves of some of the bright X-ray novae. These systems show an exponential decay in soft X-rays with an e-folding time constant of approximately 30 days. We investigate a scenario in which evaporation of matter into a corona is the dominant mass removal mechanism from the ...
PubMed
This paper describes thermal performance of a loop heat pipe (LHP) with two evaporators and two condensers in ambient testing. Each evaporator has an outer ...
NASA Website
Present theory of field evaporation assumes it to be a thermally activated process. Recent measurements of the charges of the field evaporated ions show that the relative abundance of the ionic species changes rapidly with emitter temperature. The thermal...
National Technical Information Service (NTIS)
Young low-mass stars are characterized by ejection of collimated outflows and by circumstellar discs which they interact with through accretion of mass. The accretion builds up the star to its final mass and is also believed to power the mass outflows, which may in turn remove the excess angular momentum from the star-disc system. However, although the ...
We have studied the dependence of the profiles of molecular abundances and line emission on the accretion flow in the hot ($\\ga 100$K) inner region of protoplanetary disks. The gas-phase reactions initiated by evaporation of the ice mantle on dust grains are calculated along the accretion flow. We focus on methanol, a molecule that is ...
E-print Network
We consider the effect of accretion of radiation in the early Universe on primordial black holes in Brans-Dicke theory. The rate of growth of a primordial black hole due to accretion of radiation in Brans-Dicke theory is considerably smaller than the rate of growth of the cosmological horizon, thus making available sufficient radiation density for the ...
The standard model of an accretion disk is considered. The temperature in the inner region is computed. It is assumed that the radiated power derives from comptonized photons, produced in a homogeneous single temperature plasma, supported by radiation pre...
A linear theory is developed for thermal convective instability in radiating gas dominated by radiation pressure. Analysis demonstrates how the magnetic field and differential rotation will affect the onset of thermal convection in the interior of a black hole accretion disk.
We consider time-dependent accretion onto magnetized white dwarfs. A detailed description of a numerical method of solution to the hydrodynamical equations is given. The postshock flow is cooled by optically thin bremsstrahlung and is thermally unstable. As a result the shock height undergoes periodic oscillations. We consider the properties of this ...
Observations of novae and theoretical results, in which the authors studied the nova outburst by radially accreting H-rich matter onto an He white dwarf, have convinced them that realistic nova models must be based on accretion that includes the angular momentum of the accreting matter. In the present paper the authors develop the ...
Chemical zoning patterns in some iron, nickel metal grains from CH carbonaceous chondrites imply formation at temperatures from 1370 to 1270 kelvin by condensation from a solar nebular gas cooling at a rate of approximately 0.2 kelvin per hour. This cooling rate requires a large-scale thermal event in the nebula, in contrast to the localized, transient heating events inferred ...
... Accession Number : ADA156593. Title : The Development of a Neutron Evaporation Theory Code for the Thermal Fission of Uranium-235. ...
... difference toward thermal stability resulted in spuriously high calculated evaporation duct heights. A modification to the duct height calculation that ...
was removed, primarily by convective and evaporative cooling. Ice accreting on trees and overhead lines caused into Maine caused tree and overhead line damage comparable to that in this storm. This is consistent and evaporative cooling. Ice freezing to trees and overhead lines caused hundreds of millions of dollars of damage
In the accretion disk around a black hole or a neutron star, the radiative viscosity will much exceed the viscosity of the fully ionized gas. The Reynolds number, depending strongly on the accretion rate, will reach a minimum in the zone where the bulk of the energy is released. Thermal instability will set in, altering the local ...
... Accession Number : ADD853988. Title : Optical Properties and Structure of Thermally Evaporated Tin Oxide Films. Descriptive Note : Journal article,. ...
connected to the evaporator via a flexible thermal strap. ... Co~pling Block: The coupling block is made of a high thermal conductivity metal and is essentially a ...
The thermal emission of accretion disks in Active Galactic Nuclei (AGN) is examined. Medium broadband AGN spectra are shown in order to explain the emission mechanism proposed. Basic behaviors from radiation theory and from hydrodynamics of importance for...
We show that most of hot, optically thin accretion disk models that ignore advective cooling are not self-consistent. We have found new types of optically thin disk solutions where cooling is dominated by radial advection of heat. These new solutions are thermally and viscously stable.
The illumination of companion stars in very low mass X-ray binaries by various kinds of radiation from the neighborhood of the neutron star after accretion has terminated or during accretion is considered. If a neutron star's spun-up period approaches 0.001 s, pulsar kHz radiation can quench accretion by pushing surrounding ...
The dynamics of iron, its thermal state and its phase in the accreting Earth probably played a major
NASA Technical Reports Server (NTRS)
Subsequent aqueous and thermal alteration of chondrites, asteroidal accretion and differentiation, and the consequent formation of achondrites result in a ...
... eustacy,� caused by thermal expansion of water and melting of polar ice caps and glaciers) are not being balanced by accretion ( ... ...
NBII National Biological Information Infrastructure
Chondrites are increasingly understood to be the products of uniquely nebular processes. Refractory inclusions are now thought to be mixtures of high-temperature condensates and evaporation residues. High-resolution chronometers demonstrate that the formation of refractory inclusions predated chondrules. The heating mechanism for chondrules remains controversial, but rapid ...
A mathematical model of the evaporation of a water-emulsion mixture (lubricating agent) in thermal treatment of a synthetic fiber is suggested. It is based on an approximation of interpenetrating continua. A substantial effect of deformation heat losses on the evaporation-front motion is shown.
... of the thermal decomposition of motor oils, at elevated ... When an oil sample is heated in a neutral ... the sample is heated in air, evaporation occurs at ...
... Descriptors : (*SEA WATER, CHEMICAL PROPERTIES), FREEZING, COOLING, EVAPORATION, THERMAL ANALYSIS, SEPARATION, LIQUIDS ...
... The method of ionic liquid aerosol nanoparticle vaporization, for reactive ionic liquids such as hypergolic species, is a convenient, thermally "cooler ...
... 15) where κwall is thermal conductivity of the wall, and Φvap is evaporation heat of the wall material, -Ex is the total energy ...
and chemical processes (LPCVD, sputtering, e-gun and thermal evaporation), and process inspection equipment
Fluoropolymer etching and deposition techniques including thermal evaporation, RF sputtering, plasma
... EVAPORATION, HEAT, MOISTURE, CLOTHING, VAPOR PRESSURE ... ACCLIMATIZATION, PERSPIRATION, HEAT PRODUCTION(BIOLOGY). ...
A plasma instability which may lead to the thermal coupling of ions and electrons in two-temperature
Many accreting neutron stars do so intermittently; that is, the accretion ceases for long quiescent intervals. During the accretion outburst, reactions are induced in the crust by the continual accumulation of matter. These reactions heat the crust out of thermal equilibrium with the core, and when ...
The laboratory study of presolar grains has made important contributions to several areas of astronomy and astrophysics. For example, studying isotopic compositions of grains that condensed from the ejecta of dying stars provides "ground truth" for models of stellar nucleosynthesis. Presolar grains are also excellent probes of conditions in the Solar Nebula (accretion disk) ...
New self-consistent solutions of spherical accretion onto black holes with significant pair productions in Active Galactic Nuclei (AGN) are found. The maximum pair density is a few times that of the ionized electrons. Relativistic hydrodynamic equations, ...
Steady state and time dependent calculations of a model for accretion instability are presented, in which matter accumulates in a cold torus and then undergoes a thermal instability causing the matter to heat and flow down onto the central star. The model...
In order to develop the conceptual design of the Thermal Control System (TCS) of HOPE (Japanese orbiting plane planned to be launched by H2 rocket), the thermal model of the evaporative cooling system of the U.S. Space Shuttle was analyzed. This consists ...
Water surface temperatures can be obtained from satellite thermal remote sensing. Landsat and other satellites sense emitted thermal infrared radiation on a regular basis over much of the earth's surface. Evaporation is accomplished by the net transport o...
An evaporative thermal protection system for use in hostile environment well logging applications, the system including a downhole thermal protection cartridge disposed within a well logging sonde or tool to keep a payload such as sensors and support electronics cool, the cartridge carrying either an active ...
... Title : Development of a Pebble-Bed Liquid-Nitrogen Evaporator and Superheater for the Scaled Large Blast/Thermal Simulator Facility. ...
