Mirage effect is contactless and non destructive method which has been used a lot to determine thermal properties of different  kind of samples , transverse photothermal deflection PTD in  skimming configuration with ccd camera  and special programs is used to determine thermal conductivity of porous silicon ps  film. Ps samples were prepared by electrochemical etching. Thermal conductivity wit...

In this letter we present first results from spectroscopic observations of Diffuse Ionized Gas (DIG) in the halo of NGC 5775 obtained with FORS11 attached to UT1/Antu of the Very Large Telescope (VLT). At our slit position perpendicular to the disk (41′′ SE of the nucleus) the emission of [N ii]λ6583, [O iii]λ5007, and [O ii]λ3727 is detected out to 9 kpc into the halo, allowing possible ioniza...

Models of the continuum radiation from accreting hot plasmas typically assume that the plasma heating mechanism produces energetic particles distributed in energy either as a Maxwellian (the “thermal” models) or as an extended power law (the “non-thermal” models). The reality, however, is that neither description is probably accurate. In other astrophysical contexts where we have been able to o...

*Correspondence: P. S. Bhupal Dev, School of Physics and Astronomy, University of Manchester, Manchester, M13 9PL, UK e-mail: bhupal.dev@ hep.manchester.ac.uk We describe the evolution of Dark Matter (DM) abundance from the very onset of its creation from inflaton decay under the assumption of an instantaneous reheating. Based on the initial conditions such as the inflaton mass and its decay br...

The energy of the thermal flare plasma and the kinetic energy of the non-thermal electrons in 14 hard X-ray peaks from 9 medium-sized solar flares have been determined from RHESSI observations. The emissions have been carefully separated in the spectrum. The turnover or cutoff in the low-energy distribution of electrons has been studied by simulation and fitting, yielding a reliable lower limit...

Abstract. We generalize the method of third quantization to a unified exact treatment of Redfield and Lindblad master equations for open quadratic systems of n fermions in terms of diagonalization of 4n × 4n matrix. Non-equilibrium thermal driving in terms of the Redfield equation is analyzed in detail. We explain how to compute all physically relevant quantities, such as non-equilibrium expect...

Abstract: Refractory materials containing cordierite (2MgO.2Al2O3.5SiO2) and mullite (3Al2O3.2SiO2) are used as support in furnaces, because of their low thermal expansion properties which confer them a very good ability to thermal shock resistance. Composed of two phases presenting very different CTE (1.5–3×10-6 for cordierite and 4–6×10-6 K-1 for mullite), these materials can develop damag...