The present invention relates to an improved device for dissipating impact energy impinged upon a structure. The device comprises a first set of operative arms arranged at a right angle in alternate face-to-face relation with respect to a second set…

Shielding upon radiation should not be underestimated as it can causes hazard to health. Precautions on the released of radioactive materials should be well concerned and considered. Therefore, the combination of ceramic and boron make them very…