由采矿活动产生的金属的环境影响过程、预测及防治

虽然采矿活动影响的面积相对较小，但它能对环境产生巨大的局部影响。从采场释放的金属最初是通过矿山排放酸水和废石，尾矿的侵蚀产生的。本文简述了对矿山酸水排放所释放的金属进行预测的现有方法。一项应用地球化学模型预测矿山排放酸水和尾矿带入影响河系中铜浓度研究表明，实测的结果与预测的吻合良好。对于大规模的工业矿山开采，现已有方法对其进行预测并使其免遭污染。但是，大量小规模的采矿活动很难控制。巴西采金矿活动中     

The Lagoon of Venice： geological setting,evolution and land subsidence

The paper deals with the geological setting, history and subsidence of the Venetian Plain. Major attention is paid to the Pleistocene-Holocene stratigraphic sequence in the Lagoon of Venice, in relation to its origin that datesback to 6-7 kyr BP. Geological land subsidence, which played an important role in the origin and the evolution of the lagoon, and anthropogenic subsidence, that has recently assumed a major importance for the Venetian environment, are discussed. Considering also the sealevel rise, 23 cm loss in land elevation has occurred in the last century, leading to increased flooding events and environmental problems that require protective works.     

知识制导综合信息矿产预测定理评价系统

本文通过对综合信息矿产预测定理评价过程认知机制及其特点的初步分析，给出了知识制导的定量评价系统的设想，并利用专家系统技术，建造了知识库，开发了知识使用的推理机，建立定量评价的知识基系统，实现了这一设想。实践证明，该系统是十分有效的。     

Optical Flash of GRB 990123: Constraints on the Physical Parameters of the Reverse Shock

The optical flash accompanying GRB 990123 is believed to be powered by the reverse shock of a thin shell. With the best-fit physical parameters for GRB 990123 and the assumption that the parameters in the optical flash are the same as in the afterglow, we show that: 1) the shell is thick rather than thin, and we have provided the light curve for the thick shell case which coincides with the observation; 2) the theoretical peak flux of the optical flash accounts for only 3×10~-4 of the observed. In order to remove this discrepancy, the physical parameters, the electron energy and magnetic ratios, εe and εB, should be 0.61 and 0.39, which are very different from their values for the late afterglow.