Quantum Secret Sharing Protocol between Multiparty and Multiparty with Single Photons and Unitary Transformations

We propose a scheme of quantum secret sharing between Alice＇s group and Bob＇s group with single photons and unitary transformations. In the protocol, one member in Alice＇s group prepares a sequence of single photons in one of four different states, while other members directly encode their information on the sequence of single photons via unitary operations; after that, the last member sends the sequence of single photons to Bob＇s group. Then Bob＇s, except for the last one, do work similarly. Finally the last member in Bob＇s group measures the qubits. If the security of the quantum channel is guaranteed by some tests, then the qubit states sent by the last member of Alice＇s group can be used as key bits for secret sharing. It is shown that this scheme is safe.     

S波段速调管双间隙输出腔的设计和实验研究

 介绍了S波段强流相对论速调管放大器(RKA)双间隙输出腔高频系统的设计,并利用3维粒子模拟程序模拟和优化了短脉冲强流相对论调制电子束经过双间隙输出腔后的微波提取。在束压640 kV、束流6 kA、基波调制深度80%的条件下,模拟得到功率为1.1 GW的微波,频率约为2.85 GHz,效率28%。在高频分析和粒子模拟的基础上进行了实验研究,实验中采用束压640 kV、束流6 kA的环行电子束,经过优化调节RKA参数,在中间腔后得到了约4.6 kA的基波调制电流,加上双间隙提取腔后从该RKA获得了频率为2.9 GHz、功率为1 GW、脉宽22 ns的输出微波,束波转换效率26%。     

The traction problem in elastodynamics

In continuum mechanics, Cauchy's six equations are incomplete, and the famous Cauchy's laws of motion where ρ(?), ρb, T and divT are continuous are also incomplete. The first six equations are incomplete because the geometrical representation of deformation at a given point is as yet incomplete, and the last two laws are incomplete because b,T and divT are frame-indifferent, but ρ(?) is not, and T is a symmetric, as Cauchy interpreted himself. Therefore, we say, the last two laws can't accommodate to the asymmetric tensor. The purpose of this paper is to complete Cauchy's laws of motion by postulating an asymmetric tensor for the underlying traction field of 3-dimensional space on a general framing.     

THE TRANSFORMATION Φ AND GENERAL PYTHAGORAS’THEOREM ON THE LINEAR MANIFOLD

The primary aim of this paper is to describe the transformation function Φ^[1]. to extend the conclusion of Pythagoras’ theorem for "squared length" of any triangle and to study some geometrical significance of its application     

变换函数Φ及KUR空间存在固定点的条件

近年来,在研究外延Banach空间性质上取得了进展的有:1979年SuilliVan讨论实LP(x)空间性质并采用二维子空间的一致状态,定义了KUR空间的概念;1980年Huff讨论用序列定义的广义一致凸性,引用了NUC空间的概念:1982年俞鑫泰断言:KUR空间就是NUC空间的证明[1]。而值得注意的是Suillivan及Huff又分别提出了十分有趣的问题如下:是否每一个上自反空间都存在一个不动点[2]?及在什么条件下LP(x)空间是NUC空间[3]? 本文旨在研究变换函数的性质[4]及其与上述两个问题的关系。     

功能化磁性纳米材料检测工业废水中的多环芳烃EI北大核心CSCD

制备了一种表面含苯基的Fe_(3)O_(4)磁性纳米材料(NPs),在纯水中添加多种不同浓度的多环芳烃(PAHs)标准溶液作模拟水样,探讨了SiO2包合Fe3O4磁性纳米材料(Fe_(3)O_(4)NPs@SiO_(2))与苯基三乙氧基硅烷(PHTS)不同配比、Fe3O4NPs@SiO2-PHTS复合材料的用量、超声时间、解析溶剂等对富集水体中PAHs效果的影响,建立了实际工业废水中PAHs的检测方法。方法的标准工作曲线相关系数(R2)在0.996以上,定量限(LOQs)为0.19~2.5 ng/L,平均回收率为71.1%~105.2%,日内相对标准偏差(RSD)为3.7%~12%,日间RSD为3.5%~13%,在40 min内即可完成1次水样的分析工作。该功能化磁性纳米材料可用于富含PAHs的环境水体检测。     

多移动机械臂动力学建模及基于零空间的协作

当前机械臂需要完成的任务日益复杂，单个固定机械臂或者是移动机械臂已经不能满足需求，而多移动机械臂系统结合了移动基座的灵活性和多机械臂合作的高效性，引起了学术界的广泛关注．本文研究了在多个移动机械臂抬起目标物体后，移动平台因避障而改变移动轨迹导致与机械臂末端执行器产生相对位移时，如何利用零空间概念设计保持目标物体姿态稳定的控制方法．为验证该控制方法能适用于多移动机械臂系统，对其动力学进行建模，得到了与单机械臂系统形式一致的动力学方程．最后根据该控制方法，设计了多个移动机械臂协同搬运物体时保持物体稳定的控制律并进行了数值验证．