A procedure is described for estimating an optimum kernel for the detection by convolution of signals among Poissonian noise. The technique is applied to the detection of x-ray point sources in XMM-Newton data, and is shown to yield an improvement in detection sensitivity of up to 60% over the sliding-box method used in the creation of the 1XMM catalog.

The currently accepted model for gamma-ray burst phenomena involves the violent formation of a rapidly rotating solar-mass black hole. Gravitational waves should be associated with the black-hole formation, and their detection would permit this model to be tested. Even upper limits on the gravitational-wave strength associated with gammaray bursts could constrain the gamma-ray burst model. This...

We present results from a BeppoSAX observation of the broad absorption line (BAL) QSO CSO 755, which was observed as part of our program to investigate the X-ray properties of highly polarized BAL QSOs. CSO 755 is clearly detected by the BeppoSAX Medium-Energy Concentrator Spectrometers, making it the highest redshift (z=2.88) and most optically luminous (MV=-27.4) BAL QSO seen in X-rays. It is...

Two vertical cosmic ray telescopes for atmospheric cosmic ray ionization event detection are compared. Counter A, designed for low power remote use, was deployed in the Welsh mountains; its event rate increased with altitude as expected from atmospheric cosmic ray absorption. Independently, Counter B's event rate was found to vary with incoming particle acceptance angle. Simultaneous co-located...

Two vertical cosmic ray telescopes for atmospheric cosmic ray ionisation event detection are compared. Counter A, designed for low power remote use, was deployed in the Welsh mountains; its event rate increased with altitude as expected from atmospheric cosmic ray absorption. Independently, Counter B’s event rate was found to vary with incoming particle acceptance angle. Simultaneous co-located...

This paper deals with the automatic detection of defects within various welding. The authors propose a method based on taking an X-ray image of the welding and then applying various image processing algorithms for the detection of possible defects. This method has a significant improvement in the detection success ratio compared to classical detection techniques (by using human operators). Key-...

In this paper the feedback pulse coupled neural network (FPCNN) is used for the segmentation and edge detection of x-ray images generated from American Science and Engineering (AS&E) Inc. systems used for cargo and pallet search. We prove that this technique is able to isolate important parts of x-ray images. Furthermore, our results show that the FPCNN has a good ability to retrieve small dens...

We discuss how detection of gamma-ray emission from the decay of r-process nuclei can improve our understanding of r-process nucleosynthesis. We Ðnd that a gamma-ray detector with a sensitivity of D10~7c cm~2 s~1 at keV may detect the emission from the decay of 125Sb, 137Cs, 144Ce, Ec B 100È700 155Eu, and 194Os produced in a future Galactic supernova. In addition, such a detector may determine ...

Since several years pnCCDs are well known as radiation detectors for spectroscopic imaging in many fields of science: X-Ray Fluorescence analysis (XRF), X-ray astronomy, X-ray Free Electron Laser science, synchrotrons and in the visible range as wave front sensors in adaptive optics systems. For direct electron detection in the focal plane of (S)TEMs they have delivered remarkable results in an...

We discuss how detection of gamma-ray emission from the decay of r-process nuclei can improve our understanding of r-process nucleosynthesis. We find that a gamma-ray detector with a sensitivity of ∼ 10 −7 γ cm −2 s −1 at E γ ≈ 100–700 keV may detect the emission from the decay of 194 Os produced in a future Galactic supernova. In addition, such a detector may detect the emission from the decay...