Efficient Construction of High-Dimensional Cluster State

We present a scheme for efficiently constructing high-dimensional cluster state using probabilistic entangling quantum gates. It is shown that the required computational overhead scales efficiently both with lip and n even if all the entangling quantum gates only succeed with an arbitrary small probability, where p is the success probability of the entangling quantum gate and n is the number of qubits in the computation.     

三聚氰胺检测方法简述

三聚氰胺是一种三嗪类含氮杂环有机化合物,食用添加三聚氰胺的食品可导致结石生成,本文从气相色谱、液相色谱、电学化方法和可视化传感器四个方面综述了近年来三聚氰胺检测的若干方法,从实验方法、灵敏度、专一性三个角度对上述方法的优缺点进行对比,并对上述方法用于实际样品中三聚氰胺的检测进行可行性分析,提出了新的检测三聚氰胺的思路和方法。     

日本东北大学流体科学研究所简介

<正> 东北大学流体科学研究所(The Institute of Fluid Science)位于日本仙台,其前身是高速力学研究所(The Institute of High Speed Mechanics)。1943年10月沼知福三郎教授(F.Numachi)创建高速力学研究所时,只有空化现象和流体机械叶剖面两个研究室。到1975年,已发展到具有10个研究室,6个独立实验室和92名雇员的,主要从事空化以及流体力学基础和应用研究的举世闻名的力学研究所。这10个研究室和6个实验室分别是:空化现     

基于单芯电缆传输的多转辙机拉力测试仪设计

高速道岔转换时需要采用多转辙机牵引,详细给出了便携式多转辙机牵引道岔转换阻力测试仪的设计过程;该测试仪以NXP公司的ARM7微处理器LPC2214为硬件核心,以uC/OS-II实时操作系统为软件核心,测试仪主机和各传感器采用树形拓扑结构的主从机方案,使用单芯电缆传输技术,将测试仪主机与各传感器联接到一起,完成的同时对1~6台在轨转辙机的牵引力的测量和为各传感器供电;实测表明,测试仪完全满足设计要求,适合铁路电务人员对多点多转辙机牵引道岔转换阻力进行在轨测量,满足实际要求。     

Demultiplexer based on an off-axis holographic lens with low monochromatic aberrations

A novel scheme is proposed,in which the aberrations in the off-axis holographic lenses used as demultiplex-ers are reduced to a low enough level for relatively small channel spacing. The scheme includes optimizing the recording and reconstruction geometries and collimating the reconstruction wave with a gradient-index lens. A demultiplexer operated in the 1 550-nm band with 5-nm channel spacing and ∞-dB crosstalk is obtained using the scheme. The channel spacing can be decreased to 2 nm by etching the cladding of the output fibers to a smaller size.     

COMPONENTWISE CONDITION NUMBERS FOR GENERALIZED MATRIX INVERSION AND LINEAR LEAST SQUARES

We present componentwise condition numbers for the problems of Moore-Penrose generalized matrix inversion and linear least squares. Also, the condition numbers for these condition numbers are given.     

非线性Sobolev方程低阶混合元方法的超收敛分析及外推

本文对非线性Sobolev方程采用低阶的协调混合元(Q11+Q01×Q10)方法进行分析.利用单元的高精度结果、平均值技巧和插值后处理技术,在半离散格式下,分别导出精确解u的H1-模和中间变量p的L2-模意义下的超逼近性质和整体超收敛.进一步,利用Bramble-Hilbert引理得到三个新的渐近误差展开式.同时,通过构造合适的辅助问题,运用Richardson外推格式,得到具有精度为O(h3)阶的外推结果.     

Enhanced Field Emission from Vertical ZnO Nanoneedles on Micropyramids

Vertical ZnO nanoneedles with sharp tips are secondarily grown on tips of primarily grown ZnO micropyramids by a vapour transport process. The field emission （FE） properties exhibit a lower turn-on electric field and a higher field enhancement factor as compared with vertical ZnO microrods. This result indicates that ZnO nanoneedles have good optimum shapes for FE due to electron accumulation at sharp tips.     

钴铝和锌铝水滑石的合成

采用低过饱和共沉淀法合成了一系列锌铝和钴铝水滑石,其结构经IR和XRD表征。研究结果表明,两类水滑石晶体结构相似;钴铝水滑石的稳定性高于锌铝水滑石。     

三条路并的极值能量及一类图的能量排序

拟序是图能量排序中一种有效方法,基于该方法,已经得到了大量图类的极值能量排序的结果.Gutman给出了点数和为n的两条路的并的能量排序,而三条路的并的能量排序没有一个理想的结论.本文利用拟序法给出点数和为n的三条路的并的极值能量及一类图能量的排序.