Partial evolution based local adiabatic quantum search

Recently, Zhang and Lu provided a quantum search algorithm based on partial adiabatic evolution, which beats the time bound of local adiabatic search when the number of marked items in the unsorted database is larger than one. Later, they found that the above two adiabatic search algorithms had the same time complexity when there is only one marked item in the database. In the present paper, following the idea of Roland and Cerf [Roland J and Cerf N J 2002 Phys. Rev. A 65 042308], if within the small symmetric evolution interval defined by Zhang et al., a local adiabatic evolution is performed instead of the original “global” one, this “new” algorithm exhibits slightly better performance, although they are progressively equivalent with M increasing. In addition, the proof of the optimality for this partial evolution based local adiabatic search when M=1 is also presented. Two other special cases of the adiabatic algorithm obtained by appropriately tuning the evolution interval of partial adiabatic evolution based quantum search, which are found to have the same phenomenon above, are also discussed.     

时标上具有p-Laplaeian算子的二阶四点边值问题对称正解的存在性

利用锥上的不动点指标定理分析讨论了时标上一类具有p-Laplacian算子的二阶四点边值问题,得到了这类边值问题对称正解的存在性和非存在性结果。     

Study of the double rectangular waveguide grating slow-wave structure

A slow-wave structure (SWS) with two opposite gratings inside a rectangular waveguide is presented and analysed. As an all-metal slow-wave circuit, this structure is especially suited for use in millimetre-wave travelling wave tubes (TWTs) due to its advantages of large size, high manufacturing precision and good heat dissipation. The first part of this paper concerns the wave properties of this structure in vacuum. The influence of the geometrical dimensions on dispersion characteristics and coupling impedance is investigated. The theoretical results show that this structure has a very strong dispersion and the coupling impedance for the fundamental wave is several tens of ohms, but the coupling impedance for --1 space harmonic wave is much lower than that for the fundamental wave, so the risk of backward wave oscillation is reduced. Besides these, the CST microwave studio is also used to simulate the dispersion property of the SWS. The simulation results from CST and the theoretical results agree well with each other, which supports the theory. In the second part, a small-signal analysis of a double rectangular waveguide grating TWT is presented. The typical small-signal gain per period is about 0.45 dB, and the 3-dB small-signal gain bandwidth is only 4\%.     

Pt掺杂CeO_2的密度泛函理论研究

在不同的氧化还原环境中,CeO2(二氧化铈)易发生Ce4+/Ce3+之间的转变,具有较高的储氧释氧能力(OSC)和较好的O2-传导性.它不仅作为三元催化剂(TWCs)的重要组成成分,而且在固体氧化物燃料电池(SOFC)电解质材料方面有重要应用价值,因而在工业方面受到广泛关注.许多实验研究表明Pt/CeO2体系在低温下有较高的活性,且金属Pt嵌入CeO2体系内.     

关注用户体验：网络招聘新出路

网络招聘用户数量的增长应促进网络招聘行业的发展,但我国网络招聘行业却出现了用户数量不断增加,招聘网站收益却不断锐减的怪象,为探求原因,本文首先对我国网络招聘发展历史、现状做了简要概述,参考艾瑞咨询的调查数据重点分析总结了求职者用户在使用招聘网站过程中的需求状况,并以三个新兴招聘网站为例,说明了关注用户体验将是招聘网站未来发展的新出路。     

善用团队多样性

如何看待甚至运用内部员工的“多样性”是许多团队负责人面临的问题。现在,单一的人员结构已经过时,思考的落脚点应是“如何实现多样化”。     

SO_4~2／ZrO_2－TiO_2在合成三乙酸甘油酯中的应用

合成了固体酸催化剂，应用该催化剂合成了三乙酸甘油酯。实验表明，Ｚｒ：Ｔｉ＝２：１、活化温度为４５０℃时催化剂活性最高。酸强度和酸量分布表明中强酸位有利于酯化反应。     

通用图形接口设计

介绍了基于ＰｏｗｅｒＢｕｉｌｄｅｒ５．０的通用图形接口设计思想，该接口可以让用户方便地定科形数据窗口，实现了图形转换，动态显示图形的标签值，图形旋转，图形打印等功能，从而避免重复编写程序。     

液体滞留区对塔板效率的影响——汽体不混合、液体部分混合

在汽体不混合、液体部分混合条件下,对于液体滞留区对塔板效率的影响,提出了一个新的数学模型。经与同类模型相比较,计算结果与AIChE的实验值较接近,计算过程较简便。     

可修机器服务模型的费用分析

机器服务模型是排队论的经典问题之一.Takacs(1962)给出了这个模型的有关排队论指标.曹晋华在服务设备失效可修的前提下,将它作为排队模型和可靠性模型相结合的模型,进一步得到了该系统的各种可靠性数量指标(《数学研究与评论》1985年第4期).在朱翼隽论证了一相为指数分布,另一相为一般分布可修相位的最简闭路模型与M/G/l/N系统等价(《数理统计与应用概率》待发表),和史定华关于可修M/G(E_k/H)/l系统若干结果(《运筹学杂志》,1989年第1期)的基础上,进一步给出了工作相位是有限顾客的指数分布平行窗口相位,而维修相位为M/G(E_k/H)/l带有限等待位置情况的闭路系统的循环时间、失效分析及其费用分析。