Abstract This is a preliminary report on the development of a diffusion based inverse solver for the Helmholtz equation in the frequency domain, in the context of optical tomography. This utilizes a great simplification of the previously developed Elliptical Systems Method with the use of a certain new PDE of the 2nd order, with related boundary and special conditions. In this report we conside...

Cosmic ray astronomy attempts to identify and study the sources of ultrahigh energy cosmic rays. It is unique in its reliance on charged particles as the information carriers. While no discrete source of ultrahigh energy cosmic rays has been identified so far, a new generation of detectors is acquiring the huge exposure that is needed at the highest energies, where deflection by magnetic fields...

In 2009–2010, the Laser Interferometer Gravitational-Wave Observatory (LIGO) operated together with international partners Virgo and GEO600 as a network to search for gravitational waves (GWs) of astrophysical origin. The sensitivity of these detectors was limited by a combination of noise sources inherent to the instrumental design and its environment, often localized in time or frequency, tha...

The direct detection of gravitational radiation (GR) from astrophysical sources is one of the most important outstanding problems in experimental gravitation today. The construction of large laser interferometric gravitational wave detectors like the LIGO, VIRGO , LISA, TAMA 300, GITO 6000 and AIGO is opening a new window for the study of a vast and rich variety of nonlinear curvature phenomena...

This paper deals with communication using optical fibres. The transmission using high bandwidth can handle vast amounts of information, which can be further improved by reduction in fibre losses, increase in data rates and distances, development of optical sources and detectors compatible with fibres. The recent development in the area of fibre optic communication as well as the advances in dif...

Phase contrast imaging PCI solves the basic limitation of x-ray imaging, i.e., poor image contrast resulting from small absorption differences. Up to now, it has been mostly limited to synchrotron radiation facilities, due to the stringent requirements on the x-ray source and detectors, and only one technique was shown to provide PCI images with conventional sources but with limits in practical...

background: radon and its daughters are amongst the most important sources of natural exposure in the world. soil is one of the significant sources of radon/thoron due to both radium and thorium so that the emanated thoron from it may cause increased uncertainties in radon measurements. recently, a diffusion chamber has been designed and optimized for passive discriminative measurements of rado...

background: separate radon and thoron measurements in soil are very important in assessment of internal exposure due to inhalation of such radioactive gases. materials and methods: in this study, a low cost, small size, passive diffusion chamber has been developed for simple measurement of radon-222 and radon-220(thoron) gases separately in soil. the diffusion chamber consists of two films and ...