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This article is about mass density. For other uses, see Density (disambiguation). Density Common symbols ρ D SI unit kg/m 3 A graduated cylinder containing various coloured liquids with different densities The density , or more precisely, the volumetric mass density , of a substance is its mass per unit volume. The symbol most often used for density is ρ (the lower case Greek letter rho), although the Latin letter D can also be used. Mathematically, density is defined as mass divided by volume: [1] ρ =mV{displaystyle rho ={frac {m}{V}}} where ρ is the density, m is the mass, and V is the volume. In some cases (for instance, in the United States oil and gas industry), density is loosely defined as its weight per unit volume, [2] although this is scientifically inaccurate – this quantity is more specifically called specific weight. For a pure substance the density has the same numerical value as its mass concentration. Different materials usually have ...

Composite sandwich structure panel used for testing at NASA A sandwich-structured composite is a special class of composite materials that is fabricated by attaching two thin but stiff skins to a lightweight but thick core. The core material is normally low strength material, but its higher thickness provides the sandwich composite with high bending stiffness with overall low density. Open- and closed-cell-structured foams like polyethersulfone polyvinylchloride, polyurethane, polyethylene or polystyrene foams, balsa wood, syntactic foams, and honeycombs are commonly used core materials. Sometimes, the honeycomb structure is filled with other foams for added strength. Open- and closed-cell metal foam can also be used as core materials. Laminates of glass or carbon fiber-reinforced thermoplastics or mainly thermoset polymers (unsaturated polyesters, epoxies...) are widely used as skin materials. Sheet metal is also used as skin material in some cases. The core is bonded to...

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中非 可有以下含義： 中部非洲 中非共和国 中非帝国，1977年至1979年間取代中非共和国的國家 中国和非洲的简称，如中非合作论坛 这是一个消歧义页，羅列了有相同或相近的标题，但內容不同的条目。 如果您是通过某條目的内部链接而转到本页，希望您能協助修正该處的内部链接，將它指向正确的条目。 This page is only for reference, If you need detailed information, please check here

Foam fractionation is a chemical process in which hydrophobic molecules are preferentially separated from a liquid solution using rising columns of foam. It is commonly used, albeit on a small scale, for the removal of organic waste from aquariums; these units are known as "protein skimmers". However it has much broader application in the chemical process industry and can be used for the removal of surface active contaminants from waste water streams in addition to the enrichment of bio-products. Contents 1 History 2 Design considerations 3 Applications 4 Notes History Whilst protein skimmers have been common place in aquaria for many years, it was not until the 1960s that a concerted effort was made by Robert Lemlich of the University of Cincinnati [1] [2] to characterise a model of adsorptive bubble separation processes, of which foam fractionation is one example. Until the mid-2000s, there was very little further development of foam fract...

body.skin-minerva .mw-parser-output table.infobox caption{text-align:center} University of Münster Westfälische Wilhelms-Universität Münster Universitas Monasteriensis 校训 德語：wissen.leben 创建时间 1780年4月16日 学校类型 公立大學 捐贈基金 € 1.441億（2016） [1] 预算 € 6.287億（2015） 校监 Matthias Schwarte 校长 Ursula Nelles 职工人數 7,850（截至2016年  ( 2016-Missing required parameter 1= month ! ) [update] ，教授593人） 学生人數 43,790 (截至2016年  ( 2016-Missing required parameter 1= month ! ) [update] ) [2] 本科生人數 2,878（2016） [2] 研究生人數 4,342（2016） [2] 校址 德國 北莱茵-威斯特法伦 明斯特 校區 都市 代表色 RAL 9004 & RAL 5021           [3] 网站 www.uni-muenster.de 大學行政樓，也是學校的標志性建築 明斯特大学 （德语： Westfälische Wilhelms-Universität Münster ，缩写： WWU ）是一所公立大学，位于德国北莱茵-威斯特法伦州明斯特市。 目录 1 历史 2 科系设置 3 参考文献 4 外部連接 历史 明斯特大学是德国最大和最著名的大学之一，大学目前拥有7所学院，15个系。学校的历史可以追溯到1588年建立的教徒学校,17世纪时已经在学校开始哲学神学讲座。1771年，科隆大主教正式颁发了成立拥有4所学院的明斯特国立大学的公文。大学于1774年成立法...