نتایج جستجو برای: water and earth
تعداد نتایج: 16943378 فیلتر نتایج به سال:
abstract ion selective electrodes (ises) are electrochemical sensors that respond selectivity to the activity of ionic species. an ion-selective electrode is an electrochemical device that uses a thin selective membrane or film as the recognition element, and is an electrochemical half-cell equivalent to other half-cells of the zeroth (inert metal in a redox electrolyte). in common methods o...
today, shortage of fresh water especially in arid and semi-arid regions has caused several difficulties. whatever more than 70 percent of the earth is water, but also high salinity of water resources, caused serious restrictions for human to use these resources. therefore, desalination has attracted all attentions more than any time. between different water consumers in the country, agricultur...
introduction acetic acid bacteria are large group of obligate aerobic gram negative bacteria with the ability to oxidize ethanol to acetic acid (1). they are widely distributed in natural habitats and classified in family acetobacteraceae. members of this family are useful in industrial production of vinegar(2). acetic acid bacteria (aab) can use substrates as glucose, ethanol, lactate or glyc...
in this thesis, a new optically active poly(amide-imide) (pai) was synthesized by the indirect polycondensation reaction of the l-phenylalanine based diacid chloride and 4,4?-diaminodiphenylether in the presence of triethylamine in n-methyl-2-pyrrolidone. the formation of pai was confirmed by ftir, 1h nmr and elemental analysis. in next step, the surface of titanium dioxide (tio2) nanoparticles...
Abstract The change in entropy is calculated due to propagation of blast waves, produced by the explosion of spherical charge in sea water, using the energy hypothesis of Thomas. The release of energy is considered as instantaneous and the gravitation of earth is taken into account, assuming the earth to be a sphere of uniform density. For the sake of simplicity, effect of rotation of the earth...
Earth’s landscape is continually evolving as land uplifted by tectonic and volcanic processes is eroded by water, ice, and wind. On Earth, the dominant landforms have been produced by the action of rivers and glaciers transporting material from mountains to the sea. The amount and proportion of water and ice available for changing the landscape are both sensitive to climatic regime, so that a s...
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