Variety of applications of fast neutron detection utilize thermal neutron detectors and moderators. Examples include homeland security applications such as portal monitors and nuclear safeguards which employ passive systems for detection of fissile materials. These applications mostly rely on gas filled detectors such as 3He, BF3 or plastic scintillators and require high voltage for operation. ...

This paper presents the semi-passive replication technique – a variant of passive replication – that can be implemented in the asynchronous system model without requiring a membership service to agree on a primary. Passive replication is a popular replication technique since it can tolerate non-deterministic servers (e.g., multithreaded servers) and uses little processing power when compared to...

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 ...

The classic MIMO wiretap channel comprises a passive eavesdropper that attempts to intercept communications between an authorized transmitter-receiver pair, each node being equipped with multiple antennas. In a dynamic network, it is imperative that the presence of an eavesdropper be determined before the transmitter can deploy robust secrecyencoding schemes as a countermeasure. This is a diffi...

TeleCare The home care service continues to grow as the overall population ages, and as the economic situation requires parents and other adults of the family all out for work and for longer hours. At the same time, Hong Kong, following the global trend, is shifting its care provision more and more from the expensive institutional-based model to the more economical community-based and family-ba...

OBJECTIVE To determine the prevalence of injury prevention counseling opportunities in children referred to a pediatric otolaryngologist. DESIGN A caregiver questionnaire was administered during office registration. SETTING Hospital-based pediatric otolaryngology practice in a metropolitan area. PATIENTS Random sample of 300 caregiver questionnaires stratified by the age of the child. M...

Currently deployed passive gamma and neutron detectors screen for illicit nuclear material. Archived data can help evaluate special nuclear material detection probabilities and investigate several related issues, including (1) nuisance gamma alarms arising from naturally occurring radiation, (2) the impact of drifting neutron and gamma background rates, and (3) radioisotope identification perfo...