The basic requirement for a imaging low-light level system (one capable of single photon counting) is that the device has low dark current. Photocathode based devices have the advantage over solid state devices in this regard as the dark current is inherently low. A further requirement for UV detectors is the necessity to suppress the sensitivity in the red, and wide-band gap semi-conductors ll...
The aim of this review paper is to enlighten some recent progresses in quantum optical metrology in the part of quantum efficiency measurements of photo-detectors performed with bi-photon states. The intrinsic correlated nature of entangled photons from Spontaneous Parametric Down Conversion phenomenon has opened wide horizons to a new approach for the absolute measurement of photodetector quan...
Since a few years the direct detection of X-ray photons into electrical signals is possible by usage of highly absorbing photo conducting materials (e.g. CdTe) as detection layer of an underlying CMOS semiconductor X-ray detector. Even NDT energies up to 400 keV are possible today, as well. The image sharpness and absorption efficiency is improved by the replacement of the unsharp scintillation...
The Belle II experiment at the SuperKEKB aims collecting 50 times more data than its predecessor Belle. One of key components in is particle identification (PID), especially separation kaons and pions. In spectrometer, a proximity focusing ring imaging Cherenkov detector using aerogel as radiator (ARICH) equipped for PID forward endcap. this counter, total 420 hybrid avalanche photo-detectors (...
I discuss general unified formulas for resumming collinear and soft contributions to QCD hard scattering cross sections at large x. Expansions of the resummed cross sections to next-to-next-to-next-to-leading order are also shown along with applications of the formalism. Presented at DPF 2004, Riverside, California, August 26-31, 2004.
An open edge of a simple polygon is the set of points in the relative interior of an edge. We revisit several art gallery problems, previously considered for closed edge guards, using open edge guards. A guard edge of a polygon is an edge that sees every point inside the polygon. We show that every simple non-starshaped polygon admits at most one open guard edge, and give a simple new proof tha...
abstract various studies carried out on different photo anthropometry, but each one had some deficiencies which during the years they have been resolved. the objective of this paper is to test the efficiency of two-dimensional image processing software in photo anthropometry of hand. in this applied research, 204 office workers and industrial workers were selected. their hands were measured by ...
1. INTRODUCTION. The premise of this article—what our friends in theatre would call its " conceit " —is that we are about to visit a gallery devoted to the history of calculus. Admittedly no such institution exists, but it is easily imagined. One need only think of an art museum, albeit one whose masterpieces are not canvases but theorems and whose masters are not Courbet and Cezanne but Leibni...
