X-ray spectroscopy of Seyfert 1 galaxies often reveal absorption edges resulting from photoionized gas along the line-of-sight to the central engine, the so-called warm absorber. I discuss how recent ASCA observations of warm absorber variability in MCG?6-30-15 can lead us to reject a one-zone model and, instead, have suggested a multi-zone warm absorber. The evidence for dust within the warm a...

The results of an X-ray observation of the nearby core-dominated, super-luminal quasar 4C +73.18 (1928+738) with ASCA are reported. Variations of the 1–10 keV flux on time-scales of the order of 10 hours were found while the 0.5– 1 keV flux remained almost unchanged. The measured flux at 1 keV had increased by ∼ 50% compared with previous observations 18 years ago. The quasar shows a curved spe...

At low redshifts, a census of the baryons in all known reservoirs falls a factor of two to four below the total baryon density predicted from Big Bang nucleosynthesis arguments and observed light element ratios. Recent cosmological hydrodynamic simulations suggest that a significant fraction of these missing baryons could be in the form of warm/hot gas in the filaments and halos within which mo...

Abstract. The observation of the Narrow-Line Seyfert 1 galaxy IRAS13349+2438 performed by XMM-Newton European Photon Imaging Camera between 0.3-10 keV, is presented here. The broadband spectrum of the source is dominated at low energies (E≤2 keV) by a strong excess of emission and by complex emission/absorption features between ∼ 5.5-8.0 keV. The soft X-ray spectrum is consistent with ionized a...

Simultaneous heat and mass transfer in unsteady free convection flow with thermal radiation and thermal diffusion past an impulsively started infinite vertical porous plate subjected to a strong magnetic field is presented. The dimensionless governing equations for this investigation are solved analytically using two terms harmonic and non-harmonic functions. The influence of various parameters...

The GeniSTELA code has been developed as a generalised CFD-based approach for thermal analysis of protected steelwork in fire. This is a quasi-3D approach with computation of a "steel temperature field" parameter in each computational cell. The methodology accommodates both uncertainties in the input parameters and possible variants to the specification by means of simultaneous calculations. A ...

The aim of this paper is to promote thermal analysis as a method for the study archaeological ceramics. In order achieve goal, nature methods (thermal processes, types and their application) described. Specific experimental measurements by simultaneous TG/DTG-DSC ceramic artifacts are also presented.

The continual increase in microprocessor transistor densities has led to major challenges in on-chip temperature management. Examining how emerging architectural paradigms scale from a thermal-aware design perspective is critical for sustaining high-performance computing. In this paper we explore a novel dynamic thermal management technique for simultaneous multithreaded processors. Unlike prio...

Proton exchange membranes were prepared by radiation-induced grafting of styrene onto commercial poly(tetrafluoroethylene-co-hexafluoropropylene) films using a simultaneous irradiation technique followed by a sulfonation reaction. The resulting membranes were characterized by measuring their physicochemical properties such as water uptake, ion exchange capacity, hydration number, and proton con...

A large nurober of investigations have been undertaken to develop technical systems in order to enable a tactile substitution of speech for the deaf. These aids have been evaluated with various experimental procedures (identification and discrimination tests, learning experiments, tracking procedures and other overt behaviour methods). In order to find additional evidence for the processing and...