A method of quantitatively calculating amount of allochthonous organic carbon in lake sediments

Conclusion The lake sediments have registered the information of palaeoclimate and palaeoenvironment in the lake itself and the regional scale. This also leads to a complexity in study of the palaeolimnology by all kinds of proxies. How to purify these proxies to indicate the palaeoclimate has become a problem to be solved. Most of the proxies can qualitively identify the percentage of allochthonous and autochthonous organic components, e.g. δ¹³c_org CD/TC. The model introduced in this note has provided a method of quantitatively calculating the amount of allochthonous organic carbon. As for determination of regulating parameters, i.e. A1 and As, further work is still in need.     

Collaborative applications based on the internet

The basic concepts of collaborative applications and some relevant aspects about network communications are introduced. With the examples of some collaborative applications developed by us, several technical problems about collaborative applications, such as loss of data packets, unknown IP address and timedelay, are discussed in detail. And the methods of solving these problems are also provided. Supported by International Cooperation Project (Japan, Jincheng Co. Ltd) Fang Rui: born in 1975, Graduate student     

岩爆条件下的开采技术

论述了在有岩爆危险的矿山所使用的采矿方法，并对岩爆的性质、危害、预报、防治作了较详细的阐述．为进一步开展岩爆研究，提供了有益的启示．     

固体超强酸TiO2／SO4^2—催化合成丁酸异戌酯的研究

报道固体超强酸ＴｉＯ２／ＳＯ４＾２－作为催化剂进行了酸与异戌醇酯化反应的合成路线和工艺条件，实验结果表明；使用合适条件制备的固体超强酸ＴｉＯ２／ＳＯ４＾２－在１３５￣１４２℃，酸与醇比为１：２和适量（３％ｗｔ）催化剂下，反应１．５小时，丁酸异戌酯产率可达９０％左右。