Aluminium (aluminum in American and Canadian English) is a chemical element with the symbol Al and atomic number 13. Aluminium has a density lower than those of other common metals, at approximately one third that of steel. It has a great affinity towards oxygen, and forms a protective layer of oxide on the surface when exposed to air. …
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عرض المزيدCopper and copper alloys are some of the most versatile engineering materials available. Since they can be used in an extraordinary range of applications, international copper specifications are well developed and detailed.
عرض المزيدإعادة التدوير. يُقصد بـ"إعادة التدوير" إعادة استخدام المخلفات لإنتاج منتجات أخرى، وهي عملية موجودة منذ القدم في الطبيعة، ففضلات بعض الكائنات الحية تُعتبر غذاء لكائنات حية أخرى، وقد مارس الإنسان عملية استرجاع ...
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عرض المزيدNovozym 435 (N435) is an immobilized preparation of CALB supplied by Novozymes, and the first manuscript reporting its use dates from 1992. 248 The utilized support is Lewatit VP OC 1600, a macroporous acrylic polymer resin, where CALB is adsorbed via interfacial activation, although apparently the way the enzyme is immobilized results in the ...
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عرض المزيدMining آلة سحق وعادة ما تستخدم لسحق ملموسة، والزجاج، والخزف،…
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