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Перевод: iridium

[существительное]
иридий

Тезаурус:

1. The second generation uses a new type of semiconductor laser, made of a mixture of iridium, gallium, arsenic and phosphorus.
2. Another chemist, Robert Bergman from the University of California in Berkeley, has made an organic derivative of iridium that can also split a carbon-hydrogen bond.
3. The unit includes the proposed Iridium global communications system that will use 66 low earth orbit satellites.
4. Satellite communications provide a way round this, and now Iridium Inc - a company founded recently by a consortium of companies including Motorola Inc - is to place a constellation of 66 satellites around the earth, costing 3,000m, for a commercial service that is expected to span the globe by 1998.
5. Now chemists have discovered several compounds of transition metals such as tungsten and iridium that can split an alkane carbon-hydrogen bond to form a carbon-metal bond instead.
6. 20 JAPANESE COMAPANIES PLAN INVESTMENT IN MOTOROLA'S IRIDIUM SATELLITE
7. Bergman's iridium compound, for example, is itself chemically altered during the alkyl iodode reaction.
8. A reported iridium spike coincident with Tunguska in Antarctic ice corresponds to an impactor with energy 10 2 erg.
9. Some 20 Japanese companies plan to invest in Motorola Inc's Iridium low earth orbit satellite global cellular telephone system, Reuter reports from Tokyo: the companies include Sony Corp, Mitsubishi Corp, Kyocera Corp and Daini Denden International Corp, the long-distance telephone carrier whose investors include Sony and Kyocera; the Japanese partners will form a 130m joint venture late this month to co-ordinate investment and policy in the project; Motorola says it will cost 3,370m, half coming from investors, the rest to be borrowed.
10. Bergman used his iridium compound in a sequence of reactions to demonstrate how to convert an alkane into an iodine derivative called an alkyl iodide.
11. It must be reformed before it will carry out the reaction again, thus making the reaction uneconomical as an industrial process (particularly as iridium is very expensive).
12. Like Green's compound, this iridium compound contains two hydrogen atoms that can be eliminated by light.
13. Even in the one case where independent evidence is claimed in the form of an abnormal enrichment in thin sedimentary layers of iridium and other platinum group metals, namely the much-publicized asteroid impact hypothesis for the end-Cretaceous extinctions (Alvarez, Alvarez, Asaro Michel, 1980) serious doubts have been raised by a careful analysis of some key palaeontological evidence (Clemens, Archibald Hickey, 1981).