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Beryllium has a large scattering cross section for high-energy neutrons, about 6 barns for energies above ~ 0. 01 MeV.
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Beryllium and has
Beryllium is a steel gray and hard metal that is brittle at room temperature and has a close-packed hexagonal crystal structure.
Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.
Beryllium copper has found use in ultra-low temperature cryogenic equipment, such as dilution refrigerators, because of its combination of mechanical strength and relatively high thermal conductivity in this temperature range.
Beryllium copper has been used for armour piercing bullets, though any such usage is unusual because bullets made from steel alloys are much less expensive, but have similar properties.
Beryllium has also been used in some experimental types, and hydrocarbons have been suggested as another possibility.
To date, most research has focused on FLiBe, because Lithium and Beryllium are reasonably effective moderators, and form a eutectic salt mixture with a lower melting point than each of the constituent salts.
Beryllium and for
* National Institute for Occupational Safety and Health – Beryllium Page
Beryllium copper fulfills the demands of ATEX directive for use in Zone 0, 1, and 2.
Beryllium copper is frequently used in the manufacture of professional-quality percussion instruments, especially tambourine and triangle, where it is prized for its clear tone and strong resonance.
Beryllium copper is used for measurement-while-drilling tools in the directional ( slant drilling ) drilling industry.
Beryllium copper wire is resistant to non-oxidizing acids ( for example, hydrochloric acid, or carbonic acid ), to plastic decomposition products, to abrasive wear and to galling.
The first ceramic metal material developed used magnesium oxide ( MgO ), Beryllium oxide ( BeO ), and aluminum oxide ( Al < sub > 2 </ sub > O < sub > 3 </ sub >) for the ceramic part.
The combination of good physical properties, fair electrical conductivity and moderate cost make Phosphor Bronze round, square, flat and special shaped wire desirable for many springs and electrical contacts and a wide variety of wire forms where cost of properties does not prescribe Beryllium copper.
Beryllium and neutrons
Beryllium also releases neutrons under bombardment by gamma rays.
This process occurs when the Beryllium nucleus re-emits two neutrons after absorbing a single neutron.
Beryllium is unique as being the only monoisotopic element with both an even number of protons and an odd number of neutrons.
Beryllium and 0
Beryllium copper ( BeCu ), also known as copper beryllium, beryllium bronze and spring copper, is a copper alloy with 0. 5 — 3 % beryllium and sometimes with other alloying elements.
Beryllium and .
Beryllium ( ) is the chemical element with the symbol Be and atomic number 4.
Beryllium increases hardness and resistance to corrosion when alloyed to aluminium, cobalt, copper ( notably beryllium copper ), iron and nickel.
Beryllium is corrosive to tissue, and can cause a chronic life-threatening allergic disease called berylliosis in some people.
* Walsh, KA, Beryllium Chemistry and Processing.
* ATSDR Case Studies in Environmental Medicine: Beryllium Toxicity U. S. Department of Health and Human Services
It was dated using Beryllium based Radiometric dating as living circa.
Beryllium and boron are not significantly produced in stellar fusion processes, because the instability of any < sup > 8 </ sup > Be formed from two < sup > 4 </ sup > He nuclei prevents simple 2-particle reaction building-up of these elements.
Lithium and Beryllium, the first elements in group 1 and group 2 respectively, show some properties which are different from other members of their respective groups.
Beryllium copper combines high strength with non-magnetic and non-sparking qualities.
Beryllium copper is a ductile, weldable, and machinable alloy.
Beryllium copper attains the highest strength ( to ) of any copper-based alloy.
Beryllium compounds are known human carcinogens when inhaled.
Beryllium copper is a non-ferrous alloy used in springs, spring wire, load cells and other parts that must retain their shapes during periods in which they are subjected to repeated stress and strain.
has and large
In recent weeks, as a result of a sweeping defense policy reappraisal by the Kennedy Administration, basic United States strategy has been modified -- and large new sums allocated -- to meet the accidental-war danger and to reduce it as quickly as possible.
I think that we are here also talking of the kind of fear that a young boy has for a group of boys who are approaching at night along the streets of a large city.
In fact, over the years, the American farmer's capacity to over-produce has cost the taxpayers a large dollar.
The meat cutters' union, which has a history of being one of the fairest and least corrupt in our area, represents the little corner markets as well as the large supermarkets.
It has also been observed, in helium 2, that large discrepancies can exist between surface vapor pressures and those pressures measured by a vapor pressure thermometer.
Such additional daytime class 2, assignments are appropriate if optimum use is to be made of these frequencies, and the Commission has over the years made a large number of them.
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The last-named is a fine-looking, large colt, who has been unfortunate to be laid off for some time due to injuries.
Youngsters can sleep or amuse themselves safely in the large cabin which has 5-foot 11-inch headroom, bunks for three, galley and marine toilet.
It is this subject matter that has brought Mason a large and enthusiastic following among sportsmen, but it is his exceptional performance with this motif that commends him to artists and discerning collectors.
Secretary of State Dean Rusk, a former Rhodes Scholar and Mills College dean, has headed the Rockefeller Foundation and in that role expended large sums for international cultural exchange.
The British coal industry is unprofitable, has large coal stocks it can't sell.
Another method is to announce publicly that someone has given a large donation.
Similarly, holding large feasts and giving large donations has been seen as ways of demonstrating one's resources.
A caecilian's skin has a large number of transverse folds and in some species contains tiny embedded dermal scales.
Each egg has a large yolk sac and the larva feeds on this while it develops inside the egg, emerging fully formed as a juvenile salamander.
While that national dichotomy has stymied any effort at changing the tradition of the national anthem, " America the Beautiful " continues to be held in high esteem by a large number of Americans.
For English, this is partly because the Great Vowel Shift occurred after the orthography was established, and because English has acquired a large number of loanwords at different times, retaining their original spelling at varying levels.
The popularity of CCD imaging among amateurs has led to large numbers of web sites being written by individuals about their images and equipment.
Once the screen has been cleared of all asteroids and flying saucers, a new set of large asteroids appears.
Aztlan Underground has been cultivating a grass roots audience across the country, which has become a large and loyal underground following.
Elemental astatine has never been viewed, because a mass large enough to be seen ( by the naked human eye ) would be immediately vaporized by the heat generated by its own radioactivity.
The large amount of travel done by Christie and Mallowan has not only made for a great writing theme, as shown in her famous novel: The Murder on the Orient Express, but also tied into the idea of archaeology as an adventure that has become so important in today ’ s popular culture as described by Cornelius Holtorf in his book Archaeology is a Brand.
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