نتایج جستجو برای: impactor
تعداد نتایج: 1284 فیلتر نتایج به سال:
Current planetary defense policy prioritizes a probability assessment of risk Earth impact by an asteroid or comet in the planning detection and mitigation strategies setting levels urgency budgeting to operationalize them. The result has been focus on asteroids Tunguska size, which could destroy city region, since this is most likely sort object we would need defend against. However complete c...
Decreases in the seawater 187Os/188Os ratio caused by the impact of a chondritic meteorite are indicative of projectile size, if the soluble fraction of osmium carried by the impacting body is known. Resulting diameter estimates of the Late Eocene and Cretaceous/Paleogene projectiles are within 50% of independent estimates derived from iridium data, assuming total vaporization and dissolution o...
OBJECTIVE National Football League (NFL) concussions occur at an impact velocity of 9.3 +/- 1.9 m/s (20.8 +/- 4.2 mph) oblique on the facemask, side, and back of the helmet. There is a need for new testing to evaluate helmet performance for impacts causing concussion. This study provides background on new testing methods that form a basis for supplemental National Operating Committee on Standar...
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