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111.
Ludwig Gräper 《Die Naturwissenschaften》1922,10(49):1056-1057
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Änderung des elektronenmikroskopischen Bildkontrastes beim Übergang amorph-kristallin und flüssig-kristallin 总被引:1,自引:0,他引:1
Ludwig Reimer 《Die Naturwissenschaften》1962,49(13):297-298
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Markus Hildenbrand Ludwig Luckner Ulf Jenk Jochen Schreyer 《Environmental Sciences Europe》1997,9(6):333-338
As a result of former in situ leaching activities with sulfphuric acid, nitroaromatic compounds have invaded into cenomanian and turonian sandstone aquifers and mining waters in parts of the uranium mining of Königstein, Germany (Saxony). In the mining area contamination levels of nitrobenzene, mononitrotoluene and dinitrotoluene lead to a partial excess in the drining water guide values. For environmental protection, control and remediation efforts by flooding, more knowledge about contaminant mobility in sandstone, and in intercalated clays and silts, is demanded. A selected experimental area has been flooded to realize and study transport processes under real mining conditions. In this work, we have examined the mobilization of nitroaromatic compounds by flooding waters. The interactions between the nitroaromatic compounds, which are dissolved in the mining water, and the host rocks are discussed. The existing data for strata of varying lithologic conditions suggest that the sorption processes of the compounds investigated are negligible in pure sandstone aquifer layers and significant in the lithologic conditions with a complex mixture of mudstone, siltstone and clay. Several lithologic conditions are demonstrated in contaminant sinks and sources caused by adsorption processes and mobilization of newly connected stagnant pore waters. 相似文献
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Desertification in some form is estimated to have occurred over about 42% of the 5 million km2 of arid and semiarid lands in Australia. The most common form of desertification is loss of perennial grasses from grasslands, savannas, and open woodlands, often with a replacement by inedible shrubs. Desertification continues to be a problem, especially during droughts when grazing pressures reduce ground cover, laying bare landscapes to wind and water erosion. But two national programs, Drought Alert and Landcare, are giving new hope in controlling land degradation. Both use a grassroots approach by promoting action through local pastoralist and farmer groups and by encouraging the use of effective techniques for rehabilitating landscapes. A strategic application of ponding banks and contour traps with an eye to the landscape has proven successful in stopping and reversing desertification processes. 相似文献