排序方式: 共有16条查询结果,搜索用时 15 毫秒
1.
大型精密离心机光栅测角系统的设计与实现 总被引:3,自引:0,他引:3
对JML-1大型精密离心机主轴光栅测角系统的关键技术进行了研究,给出了如何解决光栅测角系统的精度问题。抗干扰问题和动态测角问题的设计方法及测试结果。 相似文献
2.
3.
采用多巴胺化学还原法制备了分散性良好的纳米金溶胶,并检测了其作为表面增强拉曼散射(Surface Enhanced Raman Scattering,SERS)基底的性质。粒度和透射电子显微镜测试结果表明金溶胶为平均粒径30nm左右的球形颗粒,并且紫外-可见特征吸收峰出现在520nm,为典型的金纳米颗粒特征吸收峰。以罗丹明6G(R6G)为探针分子证明了金溶胶良好的SERS增强效果,用金溶胶对除草剂敌草快(DQ)进行检测,最低检测限可达1×10-7 mol/L。结果表明所制备的金溶胶具有良好的表面增强拉曼散射活性。 相似文献
4.
Identification of m=2 competent mode of complex magneto-hydro-dynamics activities during internal soft disruption based on singular value decomposition and tomography of soft-X-ray emission on the HT-7 tokamak
下载免费PDF全文
![点击此处可从《中国物理 B》网站下载免费的PDF全文](/ch/ext_images/free.gif)
In this paper,the singular value decomposition(SVD) method as a filter is applied before the tomographic inversion of soft-X-ray emission.Series of ’filtered’ signals including specific chronos and topos are obtained.(Here,chronos and topos are the decomposed spatial vectors and the decomposed temporal vectors,respectively).Given specific magnetic flux function with coupling m = 1 and m = 2 modes,the line-integrated soft-X-ray signals at all chords have been obtained.Then m = 1 and m = 2 modes have been identified by tomography of simulated ’filtered’ signals extracted by the SVD method.Finaly,using the experimental line-integrated soft-X-ray signals,m = 2 competent mode of complex magnetohydrodynamics(MHD) activities during internal soft disruption is observed.This result demonstrates that m = 2 mode plays an important role in internal disruption(Here,m is the poloidal mode number). 相似文献
5.
We propose a generalized Lanczos method to generate the many-body basis states of quantum lattice models using tensor-network states(TNS). The ground-state wave function is represented as a linear superposition composed from a set of TNS generated by Lanczos iteration. This method improves significantly the accuracy of the tensor-network algorithm and provides an effective way to enlarge the maximal bond dimension of TNS. The ground state such obtained contains significantly more entanglement than each individual TNS, reproducing correctly the logarithmic size dependence of the entanglement entropy in a critical system. The method can be generalized to non-Hamiltonian systems and to the calculation of low-lying excited states, dynamical correlation functions, and other physical properties of strongly correlated systems. 相似文献
6.
7.
通过介绍北京大学陈耀松教授创办《水动力学研究与进展》《非线性科学与数值模拟通讯》及《实用计算流体力学》的经过,总结其办刊经验:办刊要符合科技发展方向和市场需要,才能借到东风、顺势起飞;办刊要注重团队建设、整合资源,才能让刊物有大发展;办刊需要付出持续而巨大的努力,唯有知难不退、顶住压力,才能成功. 相似文献
8.
针对城市车载自组织网络环境中节点分布不平衡,信号传输被障碍物遮挡,目标节点不断移动等问题,提出一个适合城市环境基于地理位置信息的自适应路由协议SAGR(Self-Adaptive Geographic Routing for city environments in vehicular network).SAGR通过远程混合模式被动路由机制SAGR-RM和局部定向受限泛洪路由机制SAGR-LM,将路由过程分成两个层次,增强了路由协议的健壮性以及对目标位置的容错性.通过NS-2软件仿真分析了SAGR协议的性能,结果表明SAGR比现有的基于位置路由协议在数据包传输、端到端延迟和路由开销方面等都有显著的改进. 相似文献
9.
10.