草簇状石墨烯片限域Pd纳米粒子及其催化应用(英文)

通过氨基离子液体改性石墨烯,并将其固载于堇青石表面,作为负载型Pd催化剂的载体.所制备的Pd催化剂经加氢老化后,表面石墨烯呈草簇状结构,将Pd纳米粒子限域于片层内,有效防止了Pd的流失和团聚.在重要的工业反应对羧基苯甲醛(4-CBA)加氢中,此结构催化剂与传统的钯碳催化剂相比,表现出很好的稳定性     

ON BIO-EFFECTS ON KARST LANDSCAPE IN JIUZHAIGOU CONSERVATION, SICHUAN PROVINCE, CHINA—WITH SPECIAL REFERENCE TO A MICROMORPHOLOFICAL APPROACH

1.ＩｎｔｒｏｄｕｃｔｉｏｎＲｅｓｅａｒｃｈｏｎｂｉｏｋａｒｓｔｓｔｒｅｔｃｈｆｒｏｍｎｉｎｅｔｅｅｎｔｈｃｅｎｔｕｒｙ,ｙｅｔｏｎｌｙｒｅｃｅｎｔｌｙ,ｍｏｒｅｅｆｆｉｃｉｅｎｔａｎｄｓｙｓｔｅｍａｔｉｃｒｅｓｅａｒｃｈｈａｓｂｅｅｎｐｕｔｆｏｒｗａｒｄｗｉｔｈｔｈｅａｐｐｅａｒａｎｃｅｏｆｒｅｌａｔｅｄｓｐｅｃｉａｌｔｅｒｍｉｎｏｌｏｇｙａｎｄｄｅｔａｉｌｅｄｒｅｖｉｅｗｓ[3,11,30,3638],ａｎｄｉｔｓｅｅｍｓｔｈａｔｔｈｅｒｅｉｓｓｔｉｌｌｌａｃｋｏｆｂｉｏｋａｒｓｔｉｎａｌｐｉｎｅｅｎｖｉｒｏ…     

基于GIS的山区年均温分布模拟与制图

针对某些下垫面复杂而气象站(哨)有限的山区,用地理信息系统(GIS)和气温推算数学模型相结合,来获取全域的年均温分布栅格图和等值线矢量图。以龙游县为例,说明了该方法从数学模型、因素图输入、图层格式转换、图幅叠置分析等一系列技术步骤。     

狮子山铜矿岩壁X取样研究与应用

本文主要介绍了应用 X射线荧光方法在狮子山铜矿进行岩壁 X取样的技术和工作过程 ,提出了一些克服岩壁 X取样影响因素的方法。并对使用效果进行了评价     

电吸附找矿方法寻找隐伏金矿床的研究

电吸附找矿方法是指对采集的样品在室内特别装置中通电，并用吸附体吸附试样中电运移元素，通过这些元素所形成的异常来发现矿体的一种方法，该方法是依据野外地电提取方法的理论发展起来的，具有设备简单，成本低，工效效率高，工作条件及质量容易控制等优点。     

Paleocollapse structure as a passageway for groundwater flow and contaminant transport

 Paleocollapse structure is a rock collapse, resulting from the failure in the geological history of the bedrock overlying karstified limestone. Depending on the present hydrogeological conditions within the area of paleocollapse and the internal properties of these structures, they can provide a means to facilitate groundwater flow and contaminant transport. Inactive paleocollapse structures can be reactivated by human activities such as dam construction, mining underground minerals, pumping groundwater, and development of landfills. They can also be reactivated by natural events such as earthquakes and neotectonic movements. In the mines of northern China, sudden inflow of karst water from Ordovician limestone into drifts and mining stopes through paleocollapse structures has caused significant economic loss. Water pumping tests and accompanied dye traces are effective approaches of locating water-conducting paleocollapse structures. Grouting is probably the best means of preventing them from becoming geohazards. Received: 26 November 1996 · Accepted: 17 June 1997     

瑶沟等地区勘查金矿的放射性和非放射性气体地球化学方法的研究

本文介绍了瑶沟等地区勘查金矿的放射性和非放射性气体地球化学方法的研究成果：基本查明了应用本方法勘查金矿的主要条件是金矿中伴生有足够的Ｕ，Ｈｇ和碳酸盐矿物；研制成了壤中气（Ｒｎ－ＣＯ２）联测技术，提高了测量质量和探测深部矿体的能力；利用壤中气（Ｒｎ－ＣＯ２）异常进行了成矿预测，并已获得成功。     

Geochronology, geochemistry and tectonic implications of Xiongshan diabasic dike swarm, northern Fujian

Sm/Nd isotopic age determination showed that Xiongshan dike swarm was at 585.7 Ma ± 30 Ma. The trace element geochemistry and Sr/Nd/Pb isotope gemhemistry studies indicate that the dike swarm was products of back-arc basin spreading ridge and the magma originated from the depleted mantle region which was metasomatized by LILE-rich liquids/melts derived from subduction slab. Project supported by the National Natural Science Foundation of China.     

Numerical modeling of 3-D terrain effect on MT field

Using the boundary element method, the numerical modeling problem of three-dimensional terrain effect on magnetotelluric (MT) field is solved. This modeling technique can be run on PC in the case of adopting special net division. The result of modeling test for 2-D terrain by this modeling technique is basically coincident with that by 2-D modeling technique, but there is a great difference between the results of 3-D and 2-D modeling for 3-D terrain. Project supported by the National Natural Science Foundation of China.     

格子Boltzmann方法地震波场模拟

格子Ｂｏｌｔｚｍａｎｎ方法是细胞自动机在某些学科中的具体化和应用。它根据微观运动过程的某些基本特征建立简化的、时间和空间完全离散的动力学模型，这种模型的平行行为符合宏观的微分方程。