beaubell - Slashdot User

Comment Re:Skin effect: DC more deadly at same voltage (Score 1) 597

by beaubell on Friday May 29, 2015 @02:32AM (#49796675) Attached to: How Tesla Batteries Will Force Home Wiring To Go Low Voltage

Skin effect is only that when the media has a uniform impedance. The human body is anything but uniform when it comes to electrical propagation. AC is considered a greater shock hazard to humans because of it's ability to overcome the bodies natural resistance with a lower magnitude (voltage) than DC.

RFID Bracelets to Track Inmates in L.A. County 451

Posted by timothy on Wednesday May 18, 2005 @06:09PM from the nothing-unsettling-about-that-no-sir dept.

Roland Piquepaille writes "According to RFID Journal, the Los Angeles County Sheriff's Department is about to launch a pilot program to track 1,800 inmates using RFID devices. If the test is successful, the technology will be deployed for the 18,000 inmates of the L.A. county jails. With this system, inmates carry a wrist bracelet which issues a signal every two seconds and is caught by RFID readers installed everywhere in the prison. Officers and staff also carry a RFID device attached to their belts. And a central server keeps track in real time of the position of all prisoners and guardians. Besides tracking locations, the system also intends to reduce violence within the jail and to avoid escapes. If this system works as its promoters think, the potential market to equip all federal, state and county jails in the U.S. exceeds $1 billion. This overview contains other details and references, including a picture of a wristwatch transmitter worn by inmates."

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