نتایج جستجو برای: gas condensation
تعداد نتایج: 274584 فیلتر نتایج به سال:
We investigate the dynamical condensation process in a magnetized and thermally bistable flow, in one dimensional (slab) geometry. We find self-similar solutions able to describe the magneto-thermal process for weakly heterogeneous magnetic fields and perform a numerical simulation in the general case corresponding to the neutral interstellar medium. It is well known that a purely transverse ma...
Possibility of establishment of equilibrium between the photon and the dense photon bunch is studied. In the case, when the density of plasma does not change, the condition of production of the Bose-Einstein condensate is obtained. It is shown that the inhomogeneity of density of photons leads to a new intermediate state of the photon gas. 52.25.Os, 52.27.Ny, 52.40.Db Typeset using REVTEX 1 Imp...
Because of the wealth of new phenomena which the condensates display, and the precision and flexibility with which they can be manipulated, interest in them has grown explosively in communities of atomic physics, quantum optics, and many-body physics. At least twenty groups have created condensates, and the publication rate on BoseEinstein condensation has soared following the discovery of the ...
Nanometer size-selected Cu clusters in the size range of 1-5 nm have been produced by a plasma-gas-condensation-type cluster deposition apparatus, which combines a grow-discharge sputtering with an inert gas condensation technique. With this method, by controlling the experimental conditions, it was possible to produce nanoparticles with a strict control in size. The structure and size of Cu na...
The effects of condensation of the world.ng gee (nitrogen) on pitot and static pressures in the R.A.R.D.E. hypersonic gun tunnel have been examined and the onset of condensation determined for flow Mach numbers of 8.4, 10.4 and 12.9. A large degree of supersaturation was observed at the two higher Maoh numbers. Symbols M flow Mach number P statio pressure P 1 stagnation pressure p2 pitot pressu...
Nanoparticles (NPs) of indium antimonide (InSb) were synthesized using a vapor phase synthesis technique known as inert gas condensation (IGC). NPs were directly deposited, at room temperature and under high vacuum, on glass cover slides, TEM grids and (111) p-type silicon wafers. TEM studies showed a bimodal distribution in the size of the NPs with average particle size of 13.70 nm and 33.20 n...
The diffusivities of methane in single-walled carbon nanotubes (SWNTs) are investigated at various temperatures and pressures using classical molecular dynamics (MD) simulations complemented with grand canonical Monte Carlo (GCMC) simulations. The carbon atoms at the nanotubes are structured according to the (m, m) armchair arrangement and the interactions between each methane molecule and all ...
We study the characteristics of molecular gas in the central regions of spiral galaxies on the basis of our CO(J=1–0) imaging survey of 20 nearby spiral galaxies using the NRO and OVRO millimeter arrays. Condensations of molecular gas at galactic centers with sizescales ∼< 1 kpc and CO-derived masses Mgas(R < 500pc) ∼ 10 8 – 10 M⊙ are found to be prevalent in the gas-rich ∼ L ∗ galaxies. Moreov...
The experimental realization of Bose-Einstein condensation (BEC) with atoms and quasiparticles has triggered wide exploration of macroscopic quantum effects. Microcavity polaritons are of particular interest because quantum phenomena such as BEC and superfluidity can be observed at elevated temperatures. However, polariton lifetimes are typically too short to permit thermal equilibration. This ...
Phase transitions, where observable properties of a many-body system change discontinuously, can occur in both open and closed systems. By placing cold atoms in optical cavities and inducing strong coupling between light and excitations of the atoms, one can experimentally study phase transitions of open quantum systems. Here we observe and study a non-equilibrium phase transition, the condensa...
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