江苏小梅岭硅灰石矿床特征及其成因

江苏溧阳小梅岭硅灰石矿产于二叠系栖霞组硅质岩中，其成矿热液主要来自庙西花岩岩体。矿体以层状产出，矿石为不规则透镜体，方解石和硅灰石常常互层，常见有硅质岩核心。伴生矿物主要有透辉石、绿帘石、符山石、鱼眼石和萤石。根据x射线衍射分析研究，矿区内硅灰石均属三斜低温硅灰石，其a=-7．934，B0＝7．321，C0=7．068，红外光谱和差热分析表明，该硅灰石矿杂质含量较少。根据野外地质条件和理论反应式、反应曲线，小梅岭硅灰石矿形成于半封闭的体系，其形成温度和压力均属中等。     

适宜国内现状的生态工业园建设的初探

生态工业园是实现可持续发展的途径之一.文中根据当前国内工业布局、土地资源现状,并结合各种类型生态工业园特征,指出对现有企业和工业园区的改造,以及构建虚拟型生态工业园,是适宜当前国内现状的生态工业园建设类型.     

Extreme34S-Anreicherungen in gelöstem Sulfat von Grundwässern im Umfeld einer Altmülldeponie

Wir danken Dr. Kerndorff für die kritische Durchsicht des Manuskripts.     

海37引信回转体座冷挤压工艺

回转体座是海37引信中的关键件,要求有一定的机械强度、耐磨性.研制期间,曾用压铸铝合金,由于铝合金压铸内部存在着气孔,表面粗糙.不能满足其机械性能的要求.针对这一现象,研制了回转体座冷挤压成形工艺,零件表面质量好,成本低,满足了产品的机械性能要求.     

Effects of landscape homogeneity on starling roost distribution

The possible effects of landscape structure on starling roost distribution were investigated in western France using GIS analysis at different radii (2, 4, 8 and 10 km). Composition (11 land use classes) and configuration (patch size, diversity index) of the landscapes surrounding 97 roost sites used by starlings from 1981 to 2002 and surrounding 50 random points not used as roost sites were compared. Significant results suggested that starling roosts were established preferentially in the centre of an agricultural landscape where large units of pastures and arable land predominated and where natural areas were lacking both in large patches (forests or wetland classes) and in small patches such as woods in the mixed land class. A varied farmland landscape with natural areas and small patches should be promoted to limit the starling damage in wintering regions and also to favour their reproduction in regions where it has declined.