The contribution of free-free and recombination radiation to the IR emission from regions of massive star formation is investigated. A method for calculating Gaunt factors for free-free emission from a hydrogenic non-relativistic gas is employed and the results are compared with approximation formula from the literature. While the cooling of ionized star forming regions due to free-free and fre...

Quantification of infrared (IR) radiation is a convenient, noncontact method for making the base metal temperature measurements needed for on-line feedback controls. However, the problem of interference from the arc is a complicating factor in applying IR temperature sensing to welding. The objective of this research is to implement and test a top-face, noncontact temperature measurement system...

The soft X-ray background shows a general enhancement toward the inner region of the Galaxy. But whether this enhancement is a local feature (e.g., a superbubble within a distance of < ∼ 200 pc) and/or a phenomenon related to energetic outflows from the Galactic center/bulge remains unclear. Here we report a comparative X-ray emission and absorption study of diffuse hot gas along the sight line...

there are mainly two methods of deep drawing analysis; experimental and analytical/numerical. experimental analysis can be useful in analyzing the process to determine the process parameters that produce a defect free product, and the analytical/numerical modeling can be used to model and analyze the process through all stages of deformation. this approach is less time consuming and more econom...

zno nanostructures of different methods and sizes were grown in a controlled manner using a simple hydrothermal and sonochemical technique. controlling the content of concentration and temperature of the reaction mixture, spherical nanoparticles zno structures could be synthesized at temperatures 100-150 °c with excellent reproducibility in solvothermal and at different power and time in sonoch...

The Power Systems Development Facility (PSDF) is an engineering-scale demonstration facility of advanced coalfired power systems and high-temperature, high-pressure gas filtration systems. The PSDF was designed at sufficient size so that system components can be evaluated and assessed in an integrated fashion to provide data for commercial scale-up. The PSDF is funded by the U.S. Department of ...

The main challenge for gas storage and separation in nanoporous materials is that many molecules of interest adsorb too weakly to be effectively retained. Instead of synthetically modifying the internal surface structure of the entire bulk-as is typically done to enhance adsorption-here we show that post exposure of a prototypical porous metal-organic framework to ethylenediamine can effectivel...

Context. This paper is the third in a series of NH3 multilevel imaging studies in well-known high-mass star forming regions. Aims. We want to map at sub-arcsecond resolution highly-excited inversion lines of NH3 in the high-mass star forming region W51 Main (distance=5.4 kpc). Methods. Using the Karl Jansky Very Large Array (JVLA), we have mapped the hot and dense molecular gas in W51 Main, wit...

Fast-growing trees such as Salix viminalis L. and Populus tremula L. are well suited to phytoremediate heavy metal contaminated soils. However, information on tree performance, particularly leaf function, under conditions of heavy metal contamination is scarce. We used yearly coppiced saplings of S. viminalis and P. tremula growing in model ecosytems to test four hypotheses: (1) heavy metal con...