The rail gun is an electromagnetic device that converts electrical energy into mechanical energy for accelerating the projectile to hypervelocity. In order to accelerate the projectile between the conducting rails, it uses the magnetic field generated by the rail current. The rail gun consists of two parallel conductors called the rails that are bridged by a non-ferromagnetic conductor called a...

in ordere to determine the prognosis of perforating eye injuries caused hy bb guns in our patients, the visual and anatomic results of 14 patients with gun injuries seen between september 1996 and february 1998 in farafti hospital and private office in tehran were reviewed. five patients liad nonn erf orating eye injuries. all perforated eyes underwent scleral buckling, tenseclomy, vitrectomy a...

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 ...

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.