high-alkali

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• Alkali soils — Alkali, or alkaline, soils are clay soils with a relatively high exchangeable sodium percentage, a relative high pH (> 9), a poor soil structure and a low infiltration capacity. Often they have a hard calcareous layer at 0.5 to 1 m. depth (in… …   Wikipedia

• Alkali Silica Reaction — (ASR) is a reaction between reactive silica (in the concrete aggregates) and an alkali (usually present in the cement), which results in the formation of a gel. This gel increases in volume with water and exerts expansive pressure on the concrete …   Wikipedia

• alkali — [al′kə lī΄] n. pl. alkalies or alkalis [ME alkaly < Ar al qily, for al qili, the ashes (of saltwort) < qalai, to roast in a pan] 1. any base or hydroxide, as soda, potash, etc. that is soluble in water and gives a high concentration of… …   English World dictionary

• alkali metal — Chem. any of the group of univalent metals including potassium, sodium, lithium, rubidium, cesium, and francium, whose hydroxides are alkalis. [1880 85] * * * Any of the six chemical elements in the leftmost group of the periodic table (lithium,… …   Universalium

• Alkali metal — Group → 1 ↓ Period 2 3 Li 3 …   Wikipedia

• alkali feldspar — Any of several common silicate minerals that often occur as whitish to variously coloured, glassy crystals. The alkali feldspars may be regarded as mixtures of sodium aluminosilicate (NaAlSi3O8) and potassium aluminosilicate (KAlSi3O8). Both the… …   Universalium

• Alkali-metal thermal to electric converter — The Alkali Metal Thermoelectric Converter (AMTEC) is a thermally regenerative electrochemical device for the direct conversion of heat to electrical energy. It is characterized by high potential efficiencies and no moving parts, which make it a… …   Wikipedia

• high-pressure phenomena — ▪ physics Introduction       changes in physical, chemical, and structural characteristics that matter undergoes when subjected to high pressure. pressure thus serves as a versatile tool in materials research, and it is especially important in… …   Universalium

• Alkali Ridge — Infobox nrhp | name =Alkali Ridge nrhp type = nhld caption = nearest city= Monticello, Utah locmapin = Utah area = architect= architecture= designated= July 19, 1964cite web|url=http://tps.cr.nps.gov/nhl/detail.cfm?ResourceId=555… …   Wikipedia

• High-temperature superconductivity — Unsolved problems in physics What causes superconductivity at temperatures above 50 kelvin? High temperature superconductors (abbreviated high Tc or HTS) are materials that have a superconducting transition temperature (Tc) above 30 K… …   Wikipedia

• High Desert (Oregon) — Oregon High Desert Oregon Outback and Great Sandy Desert Region …   Wikipedia