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The Great Sand Sea in Egypt presents the history of one of the large sand seas in the Sahara, beginning with the sand supply by fluvial transport from partly distant areas and also by local sandstone weathering. It also details sand as carrier of information and to show the possibilities of sedimentary analysis in dealing with such a topic. Simple measurements may supply important information (e.g. salinity measurements). Well known methods can be developed further to answer special questions. A wealth of information can be drawn from especially adapted sedimentological investigations.

Sand dunes --- Sedimentation analysis --- Centrifugation --- Particle size determination --- Dunes --- Landforms --- Sedimentation analysis.

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Mechanical activation of solids is a part of mechanochemistry, the science with a sound theoretical foundation exhibiting a wide range of potential application. Mechanical activation itself is an innovative procedure where an improvement in technological processes can be attained via a combination of new surface area and defects formation in minerals. Mechanical activation is of exceptional importance in extractive metallurgy and mineral processing and this area forms the topic of this book and is the result of more than twenty years of research and graduate teaching in the field. In p

Ore-dressing. --- Mechanical chemistry. --- Size reduction of materials. --- Comminution --- Grinding (Size reduction) --- Particle size reduction --- Mills and mill-work --- Mechanically induced chemical reactions --- Mechanochemistry --- Stress induced chemical reactions --- Chemistry, Physical and theoretical --- Beneficiation of ores --- Dressing of ores --- Jigging --- Milling (Metallurgy) --- Mineral dressing --- Mineral processing --- Ore treatment --- Smelting