Tellurium nanostructures have been prepared by physical vapor deposition method in a tube furnace. The experiments were carried out under argon gas flow at a pressure of 1 mbar. Tellurium powder was evaporated by heating at 350°C and 430°C and was condensed on substrates at 110–250°C, in the downstream of argon gas flow. The products were characterized by field emission scanning electron micros...

Nowadays, increased attention has been focused on internal combustion engine fuels. Regarding environmental effects of internal combustion engines particularly as sources of pollution and depletion of fossil fuels, compressed natural gas has been introduced as an alternative to gasoline and diesel fuels in many applications. A high research octane number which allows combustion at higher co...

It is of great significance to obtain the source mixed gas emission from working face and law each coal seam for targeted implementation control measures. Based on principle that hydrocarbon isotope values in different seams have significant variability, a method identifying proposed. Taking Pingmei No. 6 Coal Mine as study area, distribution characteristics value were obtained by testing carbo...

Well-crystallized Ba2SiO4:Eu powders were grown on a substrate by the vapor phase reaction between a mixed powder (barium carbonate and europium oxide) and SiO gas. The vaporization of SiO occurs at 1400–1600◦C from the SiO2 source (or SiO powder) in a reducing atmosphere. The formed SiO gas was transported by 95 vol% Ar 5 vol% H2 gas and reacted with the raw material powders. The emission inte...

We have studied the FR I radio galaxy NGC 6251 and its environment at several wavelengths and scale lengths. On the large scale, we have probed the gravity field by measuring the velocity dispersion of the cluster members associated with NGC 6251 and relating this to the clus-ter's X-ray emission. On the small scale, the gravitational information is provided by cold HI near the nucleus and the ...

Time-resolved spectroscopy of the novalike variable UU Aquarii is analyzed with eclipse mapping techniques to produce spatially resolved spectra of its accretion disc and gas stream as a function of distance from disc centre in the range 3600-7000Å. The spectrum of inner disc shows a blue continuum filled with deep, narrow absorption lines which transition to emission with clear P Cygni profile...

XMM-Newton recently discovered O VII line emission from ∼ 2 million K gas near the outer parts of several clusters of galaxies. This emission is attributed to the Warm-Hot Intergalactic Medium. The original sample of clusters studied for this purpose has been extended and two more clusters with a soft X-ray excess have been found. We discuss the physical properties of the warm gas, in particula...

We report on the results of an in depth investigation of the extended [O ii]λ3727 line-emission in 11 3CR radio galaxies (0.5 < z < 1.1). Using a FabryPerot etalon to obtain both the kinematics and morphology of the [O ii] gas, our goal was to find the mechanisms responsible for the creation and excitation of this warm gas, and the source of its alignment with the radio emission.

This paper discusses results from the MATTER project (MATerials Technologies for greenhouse gas Emission Reduction). The goal of the project is to provide more insight into the potentials to reduce greenhouse gas (GHG) emissions in Western Europe through changes in the production of materials and the use of materials. GHG emission reduction is one of the key environmental problems for the susta...

We report on the molecular gas properties in the central kiloparsec of the almost face-on double barred galaxy NGC 4303 (M 61), using the CO 1−0 line emission observed with the Owens Valley Radio Observatory (OVRO) millimeter interferometer. The bulk of the molecular line emission comes from two straight gas lanes which run north-south along the leading sides of the large-scale primary bar. Vel...