TD—SCDMA系统定位算法研究与仿真

为了克服NLOS信号对移动无线电定位的影响，对TD－SCDMA系统中联合DOA与TOA实现移动终端定位的方案进行了研究，基于NLOS信号识别的算法有效地解决了NLOS信号对实施定位的影响，提出了一种对多基站时间加权定位算法，通过仿真实验证明了所采用算法的可行性，在NLOS情况下也可满足FCC对E－911业务的要求。     

A model for assessing effects of climate change on runoff in China

A model is established for assessing the effects of climate change on runoff in China based on the land surface parameterization scheme variable infiltration capacity (VIC). The entire area of China is represented by 2604 cells with a resolution of 60 km×60 km for each cell. Forcing data, soil and vegetation parameters needed by the VIC model for the entire area of China are prepared. Daily forcing data, which are obtained from 740 stations between 1980 and 1990, are interpolated to the 60 km×60 km grid system. The VIC model is run on every grid cell over the whole China, and a routing scheme is run offline with daily input of surface runoff and drainage from the VIC to get hydrograph at basin outlets. The spatial patterns of simulated runoff and mean annual precipitation are consistent very well. The results of monthly streamflow simulations over the Huaihe and Weihe River basins indicate that there is a good agreement between the observed and simulated values, and also initially indicate the rationality and feasibility of the evaluation model.     

A new method to dynamically simulate groundwater table in land surface model VIC

Soil moisture plays an important role in water and energy balance in land-atmospheric interaction, but is impacted directly by the groundwater table. Dynamic variation of the groundwater table can be described mathematically by a moving boundary problem. In this paper, the moving boundary problem is reduced to a fixed boundary problem through a coordinate transformation. A new model of groundwater table simulation is developed using the mass-lumped finite element method and is coupled with the land surface model of Variable Infiltration Capacity (VIC). The simulation results show that the new model not only can simulate the groundwater table dynamically, but also can evade the choice of water table depth scale in computation with a low computation cost.     

若干现代运动训练理论与球类运动实践的再认识

现代运动训练理论的发展和实践的深入，使运动训练中的训练周期的观念更新、训练负荷的安排、恢复手段的采用有了深刻的新认识。注重整体力量训练，运动员体能训练与技战术训练紧密结合的新思路。     

高速模拟钢质弹丸侵彻多层靶仿真

利用显式动力有限元程序对用37火炮发射的着靶速1300m／s左右钢弹侵彻大间隔多层A3薄钢靶板的过程进行了数值模拟，分析了弹速、弹重、弹形等影响因素对侵彻过程的作用规律，计算结果和实验结果得到了较好的吻合。研究表明，弹丸的比动能是衡量弹丸侵彻能力的重要参数，在一定的弹丸速度范围内，当弹靶材料和靶板结构固定时，弹丸的侵彻能力是由弹丸的比动能所决定的。     

M_2Cl_4(PH_3)_4(M=Cr、Mo、W)分子的DFT计算

采用密度泛函理论(DFT)研究M_2Cl_4(PH_3)_4(M=Cr、Mo、W)分子,在D_(2d)对称约束下进行结构优化和能量解析,三种化合物的M—M键长分别是C—Cr1.737A,Mo—Mo2.157A,W—W2.286A.能量解析表明:E_(Cr—Cr)相似文献   

间接原子吸收法测定茶叶中茶多酚的含量

研究了间接测定茶叶中茶多酚的原子吸收法。基于茶多酚与碱式乙酸铅发生络合反应，定量生成难溶于水的黄色沉淀，经离心后，用原子吸收法测定上清液中过量的铅离子，可间接测得茶多酚含量。其线性范围为3～25μg／mL，RSD=1．3％。测定结果与经典滴定法基本一致。     

DNA分子标记在果树上的应用

介绍了在果树上常用的DNA分子标记的原理和特点，并对其在果树的分子遗传图谱和指纹图谱的构建，品种鉴别、系谱分析和分类，基因定位与分子标记辅助选择等方面的应用进行了综述。     

碳纤维加固低配箍混凝土梁板柱节点的抗震试验

简要介绍了五个用碳纤维加固的混凝土低配箍梁板柱节点低周反复试验的情况 ,对试验结果进行了分析 ,发现加固后的节点极限承载力和抗震性能都有大幅度的提高 ,各项性能指标都达到并超过了我国现行抗震规范的要求 ,因此碳纤维加固混凝土节点技术是一个值得进一步深入研究的课题 .     

基于VRTX操作系统的列车总线节点的设计

在列车控制系统中 ,车载数据通信必须具有良好的实时性 .绞线式列车总线 (WTB)就是符合这一要求的一种专用现场总线 .为此介绍了列车通信网标准 (IEC6 1375— 1)中的WTB部分 ,以及WTB节点的硬件设计和软件设计 .在硬件设计中 ,论述了物理层和链路层的设计 .在软件设计中 ,阐述了本系统所用的实时操作系统平台———VRTXx86 /rm ,并且从状态机的角度分析了系统中的几个主要进程