Numerical modeling of radionuclide migration in porous media with nonequilibrium sorption

Ｎｕｍｅｒｉｃａｌｍｏｄｅｌｉｎｇｏｆｒａｄｉｏｎｕｃｌｉｄｅｍｉｇｒａｔｉｏｎｉｎｐｏｒｏｕｓｍｅｄｉａｗｉｔｈｎｏｎｅｑｕｉｌｉｂｒｉｕｍｓｏｒｐｔｉｏｎ￥ＣｈｅｎＪｉａｊｕｎ；ＤａｉＪｉｅ（ＤｅｐａｒｔｍｅｎｔｏｆＥｎｖｉｒｏｎｍｅｎｔａｌＥｎ...     

无盘网络系统的介绍和应用

无盘网络系统是一种很适合在计算机配置较固定、软件程序较划一的网络环境中运行的网络系统,随着电脑教育的规模扩大,网络教室的普及,发展也非常快.本文简述了其产生环境、功能介绍,针对其优势和不足说明了无盘网络系统的应用前景是非常广阔的.     

浅议影响污水生物除磷的因素

针对目前水体富营养化严重，污水除磷要求高的现状，着重分析阐述了在目前条件下的对污水生物除磷产生较显著影响的因素，如，溶解氧及氧化还原电位，硝酸盐，泥龄，进水营养比等，以期对生产实践有所帮助。     

Synthesis and structure-activity relationship of diene modified analogs of<Emphasis Type="Italic"> Matsucoccus</Emphasis> sex pheromones

The biological activity of the Matsucoccus spp. sex pheromones and diene modified analogs has been tested in forests of Israel and Portugal in order to explore the structure-activity relationship of the pine bast scale pheromone/kairomone system. The response of the adult predatory bugs, Elatophilus hebraicus and E. crassicornis and of the brown lacewing, Hemerobius stigma is more selective than that of the conspecific Matsucoccus males. The removal of the terminal methyl group from the diene terminus of both pheromones 1 and 2 eliminates all kairomonal activity but retains moderate pheromonal activity. Addition of a methyl group to the diene terminus of pheromones 1 and 2 sustains full pheromonal and kairomonal activities of the Elatophilus spp. but eliminates entirely the kairomonal activity of H. stigma. Subtle designed alterations in the structure of the diene group, typical of all Matsucoccus pheromones, change the mode of the kairomonal activity markedly.     

狭窄海湾潮交换的分段模式Ⅱ.在象山港的应用

作者前文所建立的狭窄海湾潮交换的分段模式的合理性由矩形海湾数值计算结果得到验证，并被应用于象山港海湾水的更新周期估算     

环境及环境科学的哲学概观

从哲学层次上考察环境和环境科学有关问题，对环境问题的根本解决与环境科学的发展具有世界观与方法论上的指导意义。环境是一个哲学范畴，是主体活动赖于进行的自然、社会、人文条件的总和。环境哲学承认环境的价值因素，引入环境价值系统，实行自然资源的有偿使用。环境哲学将伦理观引入自然环境之中，倡导人类须规范其行为、尊重自然环境有其存在与发展的权利。环境哲学寻求从根本上解决人类自身发展的道路。     

狭窄海湾潮交换的分段模式Ⅰ.模式的建立

Ｋｕｏ 和 Ｎｅｉｌｓｏｎ 的分区段潮交换模式基于 Ｋｅｔｃｈｕｍ 潮冲程理论划分区段，并以各断面的回流系数来反映区段间的交换特征，是一个适合于狭长小潮湾沿程水交换近似估算的简捷有效的模式。本研究对该模式中的混合过程物理简化方式作了更为合理的修正，即引进了“内湾各相邻区段间水体混合交换同时发生”的设定。同时，基于对交换率概念的系统分析，本文还对模式中最重要的特征参数回流系数的特性及其简化确定方法作了进一步探讨     

凡口铅锌矿床地球化学特征及成矿作用分析

凡口铅锌矿床是发育于碳酸盐岩建造中的海底热泉喷溢沉积矿床,以“一大二富三集中”的特点和典型的地质地球化学特征吸引着中外矿床地质工作者。常量元素和矿化元素的分布、矿物包裹体特征、稀土元素组成和硫同位素组成反映出该矿床与外生作用有关。铅同位素组成具有壳源和下地壳来源铅的特征,矿物包裹体水氢、氧同位素组成表明,成矿溶液可能与深层建造水有关,后期与大气降水有关。矿区主要矿层经历海底热泉喷溢沉积-成岩的演化。     

Biologie und Biochemie des Elements Selen

The importance of selenium as an essential trace element has progressively emerged during the last years due to the analysis of selenium deficiency diseases and to the identification and characterization of a number of selenoenzymes. Selenium is incorporated in the catalytic site of the enzymes as an integral selenocysteine residue. The pathway of selenocysteine biosynthesis and incorporation has been elucidated recently for Escherichia coli. This article presents an overview on these subjects and describes the mechanisms which confer selenocysteine specificity in the framework of protein biosynthesis. In addition, some considerations concerning the phylogeny of selenocysteine incorporation are presented and a model for the evolution of the selenocysteine pathway is proposed.