Generation of high harmonics is the only available way to obtain coherent extreme ultraviolet (EUV) and soft X-ray radiation in laboratory conditions. We present a system for high harmonics generation and study of its parameters. Capillary waveguide filled with Ar gas is used to convert the pumping laser radiation from a Ti:Sapphire mode-locked femtosecond laser system. In the capillary the las...

Single bubble sonoluminescence is not an exotic phenomenon but can quantitatively be accounted for by applying a few well-known, simple concepts: the Rayleigh–Plesset dynamics of the bubble’s radius, polytropic uniform heating of the gas inside the bubble during collapse, the dissociation of molecular gases, and thermal radiation of the remaining hot noble gas, where its finite opacity ~transpa...

The astrophysical processes that led to the formation of the first seed black holes and to their growth into the supermassive variety that powers bright quasars at z ∼ 6 are poorly understood. In standard ΛCDM hierarchical cosmologies, the earliest massive holes (MBHs) likely formed at redshift z ∼ > 15 at the centers of low-mass (M ∼ > 5×10 M⊙) dark matter “minihalos”, and produced hard radiat...

Metallic gas detected in the β Pictoris circumstellar debris disk raises many questions. The origin of this gas is unclear and its very presence is difficult to explain: many constituents of the gas are expected to be radiatively accelerated outward, yet their motion appears to be consistent with Keplerian rotation out to at least 300 AU. Hydrogen has previously been hypothesized to exist in th...

Energy released by a small fraction of the baryons in the universe, which condensed out of while the IGM was cold, dark, and neutral, reheated and reionized it, exposing gas clouds within it to the glare of ionizing radiation. The first gas dynamical simulations of the photoevaporation of an intergalactic cloud by a quasar, including radiative transfer, are presented, along with a few observati...

XeF( C --* A ) laser radiation has been produced in a fivecomponent gas mixture excited by a coaxial electron beam with an intermediate pulse length ( 175 ns) and pumping rate ( 1 MW/cm'). The laser output energy was 215 mJ from an active volume of 157 cm3 (1.4 J / L ) at a total gas pressure of 8 bar corresponding to an intrinsic

We examine the cooling radiation from forming galaxies in hydrodynamic simulations of the LCDM model (cold dark matter with a cosmological constant), focusing on the Lyα line luminosities of high-redshift systems. Primordial composition gas condenses within dark matter potential wells, forming objects with masses and sizes comparable to the luminous regions of observed galaxies. As expected, th...

Please cite this article in press as: L. Qiao, Com A detailed numerical study was conducted to understand the transient flame propagation process and the flame-speed oscillation phenomenon in a carbon dust cloud. The modeling included the solution of a set of time-dependent conservation equations developed for the gas phase and the particle phase in a spherical coordinate. The gas-phase reactio...

The increment integration of renewable distributed energies means the desired operation of the electric power system will significantly depend on the performance of primary energy. In this order, an integrated approach for mutual interaction between the electricity and natural gas systems has been considered for the purpose of ensuring optimal energy exchanging between the electric power system...