The sputtering of the lunar surface by the solar wind is examined as a possible mechanism of mass fractionation. Simple arguments based on current theories of sputtering and the ballistics of the sputtered atoms suggest that most ejected atoms will have sufficiently high energy to escape lunar gravity. However, the fraction of atoms which falls back to the surface is enriched in the heavier ato...

Simulation research on the launch process of a ship-borne multiple launch rocket system is studied in this paper. First, the power spectrum density of the ship’s motion is calculated based on ocean wave energy spectrum, and the movement spectrums of the ship’s random motion are calculated. Then, the model of shipborne rocket launcher system is built by virtual prototype technology. The launch p...

OAKOC is an Army acronym used for planning operations: it stands for Observation and fields of fire, Avenues of approach, Key and decisive terrain, Obstacles, and Cover and concealment. The first point is therefore the Observation and fields of fire. It means that it is necessary to answer the following questions [1]: What can you see throughout your area? What fields of fire will you have in t...

This paper presents the experimental estimation of ignition pressure value produced by a primer in small arms ammunition. Investigations were performed using chamber capacity equal to 12.7 mm ammunition case. The inner volume was adjusted free cartridge inserting sleeve or glass balls diameter 2 4 mm. values measured inside after action primer. maximum used as an value. Depending on nature fill...

It is essential to have materials that can support armor systems for the application of body composed anti-ballistic material from coated fibers in trials order defend military personnel with better ballistic performance who are lighter against growing threats and conflicts. defense-related ballistics. New used protection subject this discussion. As shields, fiber composite currently due their ...

introduction and case report: an interesting case of shot gun injury fired from a near range of 1.0 to 2.0 meter distance as per the eye witnesses is presented here which on examination revealed that the dispersion of pellets on the body indicates that the range of fire has occurred from a distance of 4 meters to 7 meters. further the presence of wad in the wound adds to the confusion that the ...