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Beryllium er et grundstof med atomnummeret 4. Det skabes gennem stjernenukleosyntese og er et relativt sjældent grundstof i universet. Det er et divalent grundstof, der kun forekommer naturligt i kombination med andre grundstoffer i mineraler. Blandt de ædelstene, som indeholder beryllium, er beryl (med varieteter som akvamarin, heliodor og morganit) og krysoberyl.

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PERBAIKAN KARAKTERISTIK BATU BATA LEMPUNG DENGAN ...

Volume 7 No. 2, Pebruari 2007 : 165 - 179 166 without fly ash. The maximum compressive strength occurs at 40% fly ash addition with the

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Coal Mining in Indonesia - Indonesian Coal …

The Indonesian coal industry is rather fragmented with only a few big producers and many small players that own coal mines and coal mine concessions (mainly in Sumatra and Kalimantan). Since the early 1990s, when the coal mining sector was reopened for foreign investment, Indonesia witnessed a robust increase in coal production, coal exports and domestic sales of coal. The latter, however, has ...

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Naturally Occurring Radioactive material, natural materials contain radioactive elements (radionuclides), known as NORM. The earth's crust is radioactive. Information from the World Nuclear Association, the global private-sector organization that seeks toprovide information on nuclear power, nuclear energy, Chernobyl, uranium, nuclear waste management.

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