ตัวกรองผลการค้นหา
Activation
แปลว่า(english) The changing of the passive surface of a metal to a chemically active state. Contrast with passivation.
Zn
แปลว่า(english) Chemical symbol for Zinc
electrochemical
แปลว่าซึ่งเป็นปฏิกริยาทางเคมีอันเกิดจากกระแสไฟฟ้า
Aging 2
แปลว่า(english) A change in properties that occurs at ambient or moderately elevated temperatures after hot working or a heat treating operation (quench aging in ferrous alloys), or after a cold working operation (strain aging). The change in properties is often, but not always, due to a phase change (precipitation), but does not involve a change in chemical composition. In a metal or alloy, a change in properties that generally occurs slowly at room temperature and more rapidly at higher temperatures.
Chemoautotrophic
แปลว่า(Environmental Engineering) Organisms which utilize inorganic carbon (carbon dioxide or carbonates) for synthesis and inorganic chemicals for energy. See autotrophic and photoautotrophic.
Carbonation
แปลว่า(Concrete Engineering) 1) Reaction between the products of portland cement (soluble calcium hydroxides), water and carbon dioxide to produce insoluble calcium carbonate (efflorescence). 2) Soft white, chalky surface dusting of freshly placed, unhardened concrete caused by carbon dioxide from unvented heaters or gasoline powered equipment in an enclosed space. 3) Carbonated, dense, impermeable to absorption, top layer of the surface of concrete caused by surface reaction to carbon dioxide. This carbonated layer becomes denser and deeper over a period of time. 4) Reaction with carbon dioxide which produces a slight shrinkage in concrete. Improves chemical stability. Concrete masonry units during manufacturing may be deliberately exposed to carbon dioxide after reaching 80% strength to induce carbonation shrinkage to make the units more dimensionally stable. Future drying shrinkage is reduced by as much as 30%.
chemical formula
แปลว่าสูตรเคมี
petrochemical
แปลว่าปิโตรเคมี
chemical equation
แปลว่าสมการเคมี
Biochemical oxygen demand (BOD)
แปลว่า(Environmental Engineering) The amount of oxygen required to oxidize any organic matter present in a water during a specified period of time, usually 5 days. It is an indirect measure of the amount of organic matter present in a water.
Synergism is the act of working together
แปลว่า(Environmental Engineering) Two chemicals which are synergistic have a greater effect together than the sum of their individual effects. The effect can be either positive or negative.
Adsorption Water
แปลว่า(Concrete Engineering) Water held on surfaces in a material by either physical and/or chemical forces.
