The threat of terrorism is not new to transportation. From jet airliners to mass transit buses and rail terminals, vehicles and transport facilities are all-too-familiar targets of terrorist attacks.   The 1995 sarin gas attack on the Tokyo subway left 13 people dead and injured 6,000 others. The terror attack was …

As the name indicates, ultrasonic sensors measure distance by using ultrasonic waves. The basic working principle of these sensors is based on echolocation, which involves transmission of ultrasonic waves to the target object, which reflects it back to the source after receiving the initial wave. The ultrasonic sensors detect the exact …

Deep sea reach is important to Navies which can collect the information about enemy submarines as well as carry out their own operations undetected. China continues to make progress in deep sea exploration following the three-month mission of a new underwater glider in the South China Sea, which experts said …