Water in granulites: implications for the nature and evolution of the lower continental crust

The lower continental crust is one of the most important sphere-layers in the deep earth, and is the direct place where the crust-mantle interactions occur. Granulites are the dominated rocks in the lower crust, and have critical implications for the knowledge of the composition, nature and evolution of the deep crust; fluids are important mediums influencing many geochemical, geophysical and geodynamical characteristics of the lower crust, and may also play a fundamental role in the petrogenesis of granulites and the formation of the lower crusts. In this paper, we review recent advances involved with the deep continental crust, granulites and fluids, and some long-standing debates. Combined with the Fourier-transform infrared spectroscopy (FTIR) analysis performed on the mineral assemblages (cpx, opx, plag and grt) in lower crustal granulite xenoliths and terrains (exposed section) from east China, it is suggested that structural water, dominated by OH, in these nominally anhydrous phases may constitute the most important water reservoir in the deep crust. This structual water may help to understand many lower crustal geological processes and phenomena (e.g. seismic activities and electrical conductive anomalies), and influences from these water must be taken into consideration.     

电子组装无铅钎料用助焊剂的研究现状及趋势

概述了世界电子产品的无铅化趋势及相关立法,比较了世界各国及地区的助焊剂专利文献,分析了助焊剂的研究进展状况,着重论述了微电子组装中无铅钎料专用助焊剂的特点和要求,并提出了开发和研究无铅钎料专用环保型助焊剂需要解决的一些关键问题.最后,归纳了微电子组装无铅钎料专用助焊剂的发展方向和趋势.     

企鹅山群火山岩的地球化学特征和构造环境

目的研究东天山地区企鹅山群火山岩形成的构造环境。方法采用元素地球化学方法。结果东天山地区广泛分布的石炭纪企鹅山群火山岩为拉斑系列火山岩,基性火山岩稀土分配型式表现为LREE富集型,Hf/Th值为3.04~8.28,Ce/Nb值为6.09~7.4;在微量元素构造环境判别图上,基性熔岩均位于板内玄武岩区。结论东天山企鹅山群火山岩形成于大陆裂谷环境。     

垃圾焚烧发电厂飞灰浸出毒性的研究

探讨了液固比、初始pH值及浸出时间对飞灰中重金属Pb、Cr、Cd、Ni、Cu、Mn、Hg、As的浸出影响.结果表明:各重金属的浸出量都随着液固比增加而增加,其中Ni、Cu、Mn、Cd的浸出量在液固比大于25后变化较平缓,As在液固比大于60后浸出量有所降低;重金属在浸取液的pH≤1.95时的浸出浓度远远大于其在浸取液的pH≥6.13时的浸出浓度;随着浸出时间的增加,Hg的浸出浓度先下降后上升,Cr的是先上升,30h后变化不大;Cd、Cu、Pb、Ni、Mn浸出时间在2h-6h后浸出浓度迅速减小,As则快速增加,而后都变化不大;在液固比、初始pH值及浸出时间三个影响因素中,pH值对重金属的浸出影响较大,重金属在酸性环境下较易浸出,但Pb在碱性情况下也易于浸出.     

裂隙发育对煤层强度的影响

借助现代分形理论的基本思想和原理,提出了测量裂隙数量的方法。在此基础上,利用回归分析的方法对所选矿区测量结果进行量化分析研究,建立了煤体单轴抗压强度与裂隙条数之间的指数衰减关系式。实现了分形理论与统计理论相结合对数据的分析和处理,为工程实践中评价煤层强度与裂隙发育状况的关系提供了一种可操作性途径,具有一定的实际意义和指导意义。     

泛克立格法在渗透系数随机场离散中的应用及存在的问题

在分析各种随机场离散方法优缺点的基础上,提出用泛克立格方法对渗透系数随机场进行离散.编制了KRING.FOR程序对渗透系数随机场的离散效果进行了验证,结果表明在实测点所包围区域内部用最小二乘法所求解得到的权系数而进行的克立格估值计算是符合工程要求的.并针对程序调试过程中及计算结果分析中所出现的问题,提出了相应的解决对策.     

空中交通管制自动排序系统研究

提高空中交通管理效率的客观需求促进了自动化空管系统的研发,空管自动化系统主要包括航空器轨迹合成系统和实时排序计划系统两个部分。文中主要讨论实时系统中排序模块的算法及其程序模拟实现问题。该算法主要针对进近空域内进场航空器排序的问题进行处理。在一定假设条件下,大量航空器的进场行为可以抽象成数学模型,而排序过程可以被定义为一个求最优值的函数。最后通过计算机程序验证该模型。     

局域世界网络上流行病传播的动态行为研究

将SIS（Susceptible-Infective-Susceptible）疾病传播模型应用到局域世界复杂网络上,通过理论分析和数值仿真,详细研究了不同的SIS模型参数（传染率、治愈率）以及局域世界的大小（M）对疾病传播动态行为的影响,根据仿真研究和分析的结果提出了一些可行的控制策略.     

基于max-min公平性的Overlay组播速率分配问题的研究

由于IP组播需要进行路由器升级以及在可靠性和拥塞控制方面的不成熟,Overlay组播网络作为构建组播服务平台的另一个可行途径逐渐成为研究热点。针对实时多媒体应用对带宽需求的异构性,研究了异构环境下Overlay网络中多速率组播在max-min公平性下的速率分配问题,提出了一种分布式算法,可对于任意给定的Overlay组播树实现max-min速率分配,优化网络的资源利用率。     

Services oriented architecture of foundation data platform of digital city

Digital city, a large complex system, is comprised many subsystem of different fields. It involves common field data, flexible field processes, seamless intra-organization and inter-organization collaborations, and increasing connectivity and interoperability between distributed or decentralized systems. All above these are involved Foundation Data of Digital city. To promote the sustainable development of Digital City, this paper investigates to the construction of Foundation Data Platform (FDP) from the view of the architecture. The paper introduces the conceptions, characteristics and underlying problems of the FDP, and discusses the key issues of the architecture paradigms what FDP might adopted via comparing Object-Oriented Architecture (OOA), Component-Based Architecture (CBA), and Service-based Architecture (SBA). The Process Embedded Service-Oriented Architecture (SOA), one of the recent SOA Application Architecture is introduced. The results indicate that the Process Embedded SOA could promote the sustainable development of Digital City and accommodate the dynamic development environments of different fields which constantly changes requirements.