This paper presents a sentry-based approach to power management in wireless sensor networks for applications such as intruder detection and tracking. To minimize average power consumption while maintaining sufficient node density for coarse sensing, nodes are partitioned dynamically into two sets: sentries and non-sentries. Sentry nodes provide sufficient coverage for continuous monitoring and ...

What role, if any, physicians should have in the response to gun violence is a question not only of professionalism but also of law, culture, and ethics. We argue that physicians do have important roles to play in the larger landscape of advocacy, public opinion, and reduction of gun violence, but that it is not ethically or legally appropriate for them to serve as gatekeepers of gun privileges...

The headlines about gun crime and violent crime in the United Kingdom are tragic and alarming—seven deaths of young people by October 2007 from gun crime and an apparent increase in violent crime generally. When combined with other news of gun related incidents, such as the shooting of Jean Charles De Menezes by a police officer in a London underground station, anxiety about the danger of guns ...

Intestinal neutral NaCl absorption, which is made up of brush-border (BB) Na+/H+exchange linked to BB Cl-/[Formula: see text]exchange, is up- and downregulated as part of digestion and diarrheal diseases. Glucocorticoids stimulate ileal NaCl absorption and BB Na+/H+exchange. Intestinal BB contains two Na+/H+exchanger isoforms, NHE2 and NHE3, but their relative roles in rabbit ileal BB Na+/H+exc...

OBJECTIVE : To investigate whether vitamin D receptor gene (VDR) BsmI-rs1544410 and FokI-rs2228570 polymorphisms, smoking duration, and body mass index (BMI) are risk factors for cutaneous melanoma, especially metastatic melanoma. METHODS : We studied 120 cutaneous melanoma cases [68 stage I and II non-metastatic melanoma (NMetM) patients, plus 52 Stage III and IV metastatic melanoma (MetM) p...

This experimental study investigates the possible protective effects of Gum Arabic (GA) and its nanoparticles in hepato- reno-toxicity induced by bromobenzene (BB) rats mechanisms action. Thirty-five adult male albino were sorted into following: Group 1 (control), 2 (NPs), 3 (GA, received ml/kg 10%w/v aqueous suspension), 4 (Gum-NPs, GA loaded NPs), 5 (BB), 460 mg/kg, 6 (GA+BB) 7 (GA-NPs+BB). T...

The purpose of this Technology Profile is to provide summary information about enclosed spray gun washers that use alternative cleaners in order to raise awareness of their potential to reduce hazardous chemical use and the generation of hazardous waste and air emissions. This profile focuses on the potential benefits of enclosed spray gun washers using alternative cleaners when compared to tra...

An electron gun for a high-power electron linac in the Japan nuclear cycle development institute (JNC) has been developed and tested. In this electron gun, two types of grid control systems (mesh grid type and double aperture grid type) were tested for their ability to deliver high average current beams. In this paper, we discuss the problems associated with each type of gun system.