A drone developed by the US Navy has broken its own endurance record by staying in the air for just over 48 hours. The ‘Ion Tiger’ used a new cryogenic tank for the liquid hydrogen fuel feeding its fuel cells to achieve the breakthrough. Keeping a drone in the air as long as possible is a chief task for a UAV operator, especially in surveillance. One approach is to use fuel that packs... 

The small-size vibration-driven generator using magnetostriction effect. A Japanese university researcher developed a small-size vibration-driven generator that measures approximately 2 x 3 x 12mm and can output a power of 1.56mW with a vibration of 357Hz. The energy density of the generator, which was developed by Toshiyuki Ueno, associate professor at Kanazawa University, is about 22mW/cm3. It is...