In some experiments and applications there is need for large-area photosensitive detectors to operate at cryogenic temperatures. Nowadays, vacuum PMs are usually used for this purpose. We have developed special designs of planar photosensitive gaseous detectors able to operate at cryogenic temperatures. Such detectors are much cheaper PMs and are almost insensitive to magnetic fields. Results o...

Semiconductor-based solid-state neutron detectors have received considerable attention in recent years. These devices can be categorized as either thin-film-coated diode detectors or solid-form bulk detectors. There have been many attempts to fabricate boron-based solid-form detectors utilizing processing techniques similar to those frequently used to fabricate thin-film-coated diodes. Conseque...

Feature detectors using a quadratic nonlinearity in the ltering stage are known to have some advantages over linear detectors; here we consider how their scale-space properties compare. In particular, we investigate the question whether, like linear detectors, quadratic feature detectors permit a scale-selection scheme with the \causality property", which guarantees that features are never crea...

Most systems which require phase information use mixers somewhere in the measurement or comparison of the phase information. Theoretically, any mixer with a dc coupled port could be used as a phase detector. Practically, however, mixers often display some very non-ideal characteristics (e.g., dc offset) when used as phase detectors. The actual mixer chosen for a particular application will ofte...

In code division multiple access (CDMA) systems employing linear adaptive receivers, the detector is typically estimated directly from the received signals, based on some partial knowledge about the system, e.g., signature waveforms of one or several users. We derive the Cramér–Rao lower bounds on the covariances of the estimated linear detectors, under three different assumptions on the mechan...

In the past few years, there has been an increased interest in the development of alternative neutron detection technologies. Included among many promising alternative neutron detection technologies are semiconductor-based neutron detectors. These detectors are typically small and compact, hence those methods used to characterize large gas-filled neutron detectors are inappropriate. Proposed ar...

In my thesis project, I provide a description of the entire process of materials preparation, assembly, testing, and characterization of several triple-GEM (Gas-Electron Multiplier) prototype detectors. GEM detectors represent one of the latest developments in a new style of gaseous particle detectors. They have become well-known and widely used. Improvements in foil production are important fo...

This paper presents a technique to derive and implement error detectors to protect an application from data errors. The error detectors are derived automatically using compiler-based static analysis from the backward program slice of critical variables in the program. Critical variables are defined as those that are highly sensitive to errors, and deriving error detectors for these variables pr...