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*QB468-480 Non-optical methods of astronomy *QC170-197 Atomic physics. Constitution and properties of matter

* O2 Minimizer® Process controller used to control oxygenation of mixed liquor by Schreiber Corp. * obligate aerobes Bacteria that can survive only in the presence of dissolved oxygen.

[[ملف:Edge of Space of souag.png|تصغير|يسار|100بك| طبقات الغلاف الجوي]] [[en:Atmosphere of Earth]]

* earthen dam A dam made primarily of soil, sand, silt, and clay. * earthen reservoir A reservoir constructed in earth using excavated materials to form embankments.

| journal=Journal of Geophysical | title=Practical Handbook of Photovoltaics: Fundamentals and Applications

...India.jpg|96px]] || [[Image:Christaller model 1.jpg|96px]] || [[Image:Star of life.svg|96px]] ...ermore, as human relationship with the environment has changed as a result of [[globalization]] and [[technological change]] a new approach was needed to

* ICBN International Commission on the Biological Effects of Noise. * ICE (1) Institute of Civil Engineers. (2) Internal combustion engine.

* tailings Residue from the separation of useful values from ore. * tailwater The runoff of irrigation water from the lower end of an irrigated .eld.

[[Image:Ozone-montage.png|thumb||left|upleft|100px|Ozone is a rare gas on Earth found mostly in the [[stratosphere]].]] ...ng candle.PNG|thumb|upright|تجربة فيلو ألهمت الباحثين اللاحقين|alt=Drawing of a burning candle enclosed in a glass bulb.]]

...in sizing granular media .lters based on the bed depth and effective size of media. * laid length The total length of a pipe or pipeline after it has been placed in position.

...le (D/DBPR) Proposed U.S. EPA rule to limit the maximum contam­inant level of trihalomethanes. ...-threshold level of a water sample which indicates the number of dilutions of clean, odor-free air necessary to reduce an odor to a level that most peopl

* F wastes A class of hazardous wastes categorized from nonspeci.c sources as established by the * face velocity The linear velocity of air through a .lter.

* A/O® Wastewater treatment process for biological removal of nitrogen by USFil­ter/Krüger. * AAEE American Academy of Environmental Engineers.

* [[absolute atmosphere]] جو مطلق * [[absorbing of water]] مص الماء

* sacri.cial anode A sacri.cial piece of metal, usually zinc or magnesium, electri­cally connected to a more noble * SAE Society of Automotive Engineers.

* macroencapsulation Isolation of waste by embedding or surrounding it with a material that acts as a barrier * macrofouling The biological fouling of a water system with macroorganisms including clams, barnacles, and mussels.

* P2Rx Pollution Prevention Resource Exchange; a coordinated effort of nine regional pollution prevention resource centers funded by the U.S. EPA. * paint .lter test Test to determine free water content of sludge sample.

* C × T The product of the “residual disinfection concentration” (C) in mg/L deter­mined befo * C × T99.9 The CT value required for 99.9% inactivation of Giardia lamblia cysts. c/c Center-to-center.