电子贴附解离过程中的物理和化学

电子贴附解离是低能量电子与分子碰撞的重要过程,涉及电子与靶分子的相互作用、电子-分子共振态、瞬态负离子分子的解离动力学等基础物理和化学问题.本文对近年来该领域的重要进展,特别是基于负离子速度成像方法的实验研究,进行了阶段性总结,并对其未来发展方向和潜在应用进行了讨论.     

中国大地震规律初探——爆炸地质动力学理论在地震研究中的应用

地震是地球断裂构造释放能量的窗口,含能量积聚、触发、爆发和沉寂过程。地震是震源断裂结构的爆裂过程,断裂结构内压力超过岩层的断裂强度和重力之和时,地震随之爆发。对地震的触发,太阳活动影响最大,月球和太阳引力也有影响。断裂结构内的磁场异变和赵锬的形变矢量观察具有临震警报意义。     

Natural history of the marsupial Thylamys macrurus (Mammalia,Didelphidae) in fragments of savannah in southwestern Brazil

The objective of this study was to furnish information on the natural history of the Neotropical marsupial Thylamys macrurus in the southern Cerrado of Brazil. A range expansion of the species was observed to the northeast of the Mato Grosso do Sul state, Brazil. Specimens were surveyed in fragments of savannah (40–600 ha) during dry and wet seasons in 2003 and 2004 with live‐trap grids and pitfall lines. With an effort of 9767 trap nights and 2200 pitfall nights, we obtained 102 captures and 49 recaptures of T. macrurus. The data analyzed (57 males and 40 females) showed that males are more abundant in the dry season and females in the wet season. Young were recorded mostly during the wet season. Thylamys macrurus was scansorial, using the floor and the understorey. Sexual dimorphism was recorded, with males being larger than females. Information on ectoparasites is supplied.     

High-Pressure Experimental Studies on Geo-Liquids Using Synchrotron Radiation at the Advanced Photon Source

We review recent progress in studying silicate, carbonate, and metallic liquids of geo-logical and geophysical importance at high pressure and temperature, using the large-volume high-pressure devices ...     

体相CO2约化自扩散系数的标度律关联模型

用巨正则转换矩阵蒙特卡罗（GC-TMMC）和分子动力学（MD）模拟方法研究了体相CO2单位分子的过剩熵与其约化自扩散系数（D*s）的标度关系。过剩熵主要考虑3种定义：总体过剩熵sex，以分子重心径向分布函数定义的二体熵s(2)c和所有原子径向分布函数定义的二体熵s(2)t。结果表明，总体过剩熵sex与D*s之间存在明显的标度关系，并且独立于状态点所处的相态，可以用热力学量-过剩熵来关联动力学量-自扩散系数（约化方式）；二体熵在小于超临界温度范围内的标度结果偏离了-sex-D*s的“共同曲线”。本文拓展了过剩熵标度律在分子流体中的应用范围，得到了其在体相CO2自扩散系数关联中的应用规律。     

薄板冷轧过程中宽展的变化规律及其影响因素

基于金属流动原理,采用显式动力学有限元软件ANSYS/LS-DYNA模拟薄板轧制过程,研究轧制力、摩擦系数、压下率对轧件宽展变化的影响。结果表明,摩擦系数越大,轧件宽展也越大;轧件的最大宽展随着轧制力的增加而增大,轧制力对轧件后端部分宽展影响程度较大;压下率增大,轧件宽展随之增大,轧件各部分宽展的不均匀程度也在增加。     

从电影片名翻译看其静动转化及策略

多年的英汉对比研究表明，英语表现为静态性语言，汉语则是动态性语言。本文通过列举近几十年来奥斯卡获奖英语电影片名的翻译和个别电影名称的几个译本，表现了英汉翻译中的“动静相宜”。同时提出在影片的翻译策略上，归化和异化相比较而言，归化对于目的语观众似乎更加具有感召力。     

基于标签传播识别网络中的关键节点

基于标签传播动力学提出了一种识别网络关键节点的算法,主要思想是把每个节点接收到不同标签的数量作为判断节点重要性的指标。应用两种不同的传播模型,在不同网络上与其它中心性指标作比较。结果表明:基于标签传播的中心性指标比其它的中心性方法可以更好地识别网络中的关键节点。基于标签传播的中心性指标还具有以下优势:不需要利用网络的结构信息,因此可以推广到大规模网络上;揭示了一种现象——好的接收者往往也是好的传播者。     

机会网络中转发机制的研究

通过详细描述路由转发算法-传染转发算法的转发过程,分析此种算法存在的不足,提出一种基于转发度量的传染算法,并对该算法进行简要评价。     

On time-domain methods for milling stability analysis

As a basic and advanced machining technique,the high-speed milling process plays an important role in realizing the goal of high performance manufacturing.From the viewpoint of machining dynamics,obtaining chatter-free machining parameters is a prerequisite to guaranteeing machining accuracy and improving machining efficiency.This paper gives an overview on recent progress in time domain semi-analytical methods for chatter stability analysis of milling processes.The state of art methods of milling stability prediction in milling processes and their applications are introduced in detail.The bottlenecks involved are analyzed,and potential solutions are discussed.Finally,a brief prospect on future works is presented.