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secondary reduction

См. также в других словарях:

  • Secondary stress — is the weaker of two degrees of stress in the pronunciation of a word; the stronger degree of stress is called primary . The symbol for secondary stress is a short vertical line preceding and at the foot of the stressed syllable: IPA|… …   Wikipedia

  • Secondary surveillance radar — SSR antenna of Deutsche Flugsicherung at Neubrandenburg, in Mecklenburg/Western Pomerania Secondary surveillance radar (SSR)[1] is a radar system used in air traffic control (ATC), that not only detects an …   Wikipedia

  • Secondary education — is the stage of education following primary education. Secondary education includes the final stage of compulsory education and in many countries it is entirely compulsory. The next stage of education is usually college or university. Secondary… …   Wikipedia

  • Reduction of nitro compounds — The chemical reactions described as reduction of nitro compounds can be facilitated by many different reagents and reaction conditions. Historically, the nitro group was one of the first functional groups to be reduced, due to the ease of nitro… …   Wikipedia

  • Secondary flow — In fluid dynamics, a secondary flow is a relatively minor flow superimposed on the primary flow, where the primary flow usually matches very closely the flow pattern predicted using simple analytical techniques and assuming the fluid is inviscid …   Wikipedia

  • secondary education —    Between 1970 and the enactment of the LOGSE in 1990, the school system consisted of the stages EGB, BUP, COU and FP. The full implementation of the LOGSE, planned for 1999, envisages a stage of Compulsory Secondary Education (Education… …   Encyclopedia of contemporary Spanish culture

  • One-electron reduction — A one electron reduction in organic chemistry involves the transfer of an electron from a metal to an organic substrate. It serves to differentiate between true organic reductions and other reductions such as hydride transfer reactions that… …   Wikipedia

  • Vowel reduction in English — In English, vowel reduction is the centralization and weakening of an unstressed vowel, such as the characteristic change of many vowels at the ends of words to schwa. Stressed vowels cannot be reduced. Reduced vowelsSchwa is the most common… …   Wikipedia

  • Carbonyl reduction — synthesis of an alcohol by ester reduction Carbonyl reduction in organic chemistry is the organic reduction of any carbonyl group containing compound by a reducing agent. Typical carbonyl compounds are ketones , aldehydes, carboxylic acids and… …   Wikipedia

  • Lithic reduction — The Levallois technique of flint knapping Lithic reduction involves the use of a hard hammer precursor, such as a hammerstone, a soft hammer fabricator (made of wood, bone or antler), or a wood or antler punch to detach lithic flakes from a lump… …   Wikipedia

  • Selective catalytic reduction — (SCR) is a means of converting nitrogen oxides, also referred to as chem|NO|x with the aid of a catalyst into diatomic nitrogen, chem|N|2, and water, chem|H|2|O. A gaseous reductant, typically anhydrous ammonia, aqueous ammonia or urea, is added… …   Wikipedia

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