Word: nucleus
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
Invisible Springs. Compared with the difficulties of controlling fusion, producing energy from nuclear fission is relatively simple. In fission-which occurs in A-bomb explosions and powers today's nuclear plants-a speeding neutron is used to split the atomic nucleus of a heavy element like uranium into the nuclei of one or more lighter elements. In the process, more neutrons are given off. But the mass of the resulting nuclei and neutrons is somewhat less than the mass of the original nucleus; the missing matter-as predicted by the famed Einstein equation E=mc2-has been converted into...
...have larger cross sections than those of ordinary hydrogen nuclei. Thus the probability of direct collisions between them is increased and that in turn means that less extreme conditions are required to make them fuse. The easiest fusion to attain, scientists determined, was between a deuterium and a tritium nucleus; they combine to form a helium nucleus and release energy in the form of a high-velocity neutron. Both isotopes are easily obtained. Each gallon of sea water contains one-eighth gram (.004 oz.) of deuterium, which can be converted into the energy equivalent of more than 1,100 liters...
...group of young lacrosse players, who last year found themselves rated 15th in the country and this year added quality freshmen to an already outstanding nucleus, now lie four games under .500 and have no chance for the NCAA playoffs...
...their fellow tenants that to win the battle they only had to stay ensconced in their apartments "and say no. No to all intimidation. No to harrassment. No to the tireless rumormongers." Overcoming the obedience to authority of the neighbors was so difficult that by the time the small nucleus of organizers had succeeded, the number of occupied apartments had fallen from...
PENN: Coach Jim Adams returns only a small nucleus of lettermen, but they are good ones. Three All-Ivy stars, middie Mike Page, attackman Pete Hollis and defenseman Don DelGiorno, head the list...