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porous barrier

См. также в других словарях:

  • Saudi-Yemen barrier — The Saudi Yemen barrier is a physical barrier constructed by Saudi Arabia along part of its 1,800 kilometer (1,100 mile) border with Yemen. It consists of a network of sandbags and pipelines, three metres (10ft) high, filled with concrete cite… …   Wikipedia

  • Separation barrier — A separation barrier is a wall or fence constructed to limit the movement of people across a certain line or border, or to separate two populations. These structures vary in placement with regard to international borders and topography. The most… …   Wikipedia

  • Dielectric barrier discharge — (DBD) is the electrical discharge between two electrodes separated by an insulating dielectric barrier. Originally called silent (inaudible) discharge and also known as ozone production discharge[1] or partial discharge,[2] it was first reported… …   Wikipedia

  • Uzbek-Kyrgyzstan barrier — The Uzbek Kyrgyzstan barrier is a separation barrier built by Uzbekistan along its border with Kyrgyzstan to prevent terrorist infiltration. Constructing began in 1999 after bomb attacks in the Uzbek capital of Tashkent were blamed on Islamic… …   Wikipedia

  • Indo-Burma barrier — The Indo Burma barrier is a separation barrier that India is presently constructing to seal off its 1,624 kilometer (975 miles) long border with Burma. India hopes to curtail cross border crime including goods, arms and counterfeit Indian… …   Wikipedia

  • Daniell cell — Daniell cells, 1836. The Daniell cell (var. sp. Daniel cell) was invented in 1836 by John Frederic Daniell, a British chemist and meteorologist, and consisted of a copper pot filled with a copper sulfate solution, in which was immersed an… …   Wikipedia

  • History of the battery — could only function in a certain orientation. Many used glass jars to hold their components, which made them fragile. These practical flaws made them unsuitable for portable appliances. Near the end of the 19th century, the invention of dry cell… …   Wikipedia

  • Membrane potential — Differences in concentration of ions on opposite sides of a cellular membrane lead to a voltage called the membrane potential. Many ions have a concentration gradient across the membrane, including potassium (K+), which is at a high inside and a… …   Wikipedia

  • isotope — isotopic /uy seuh top ik/, adj. isotopically, adv. /uy seuh tohp /, n. Chem. any of two or more forms of a chemical element, having the same number of protons in the nucleus, or the same atomic number, but having different numbers of neutrons in… …   Universalium

  • nuclear reactor — Physics. reactor (def. 4). Also called nuclear pile. [1940 45] * * * Device that can initiate and control a self sustaining series of nuclear fission reactions. Neutrons released in one fission reaction may strike other heavy nuclei, causing them …   Universalium

  • Filtration — This article is about operation of solid fluid separation. For the mathematical concept, see filtration (mathematics). For the equipment used, see Filter (disambiguation). For filtration used in winemaking, see Filtration (wine). Diagram of… …   Wikipedia

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