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Geometric Phases Corrected by Stochastic Dephasing

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Communications in Theoretical Physics 2008年第5期49卷 1179-1181页

作者： ma xiao-san WANG An-Min Department of Modern Physics University of Science and Technology of China Hefei 230026 China

We analyze the effect of stochastic dephasing on geometric phases. The result implies that the correction of geometric phases relies on not only the fluctuation of the random variable in the stochastic process, but al... 详细信息

关键词： stochastic dephasing geometric phase

Effect of Intrinsic Decoherence of Milburn's Model on Entanglement of Two-Qutrit States

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Communications in Theoretical Physics 2008年第2期49卷 516-520页

作者： QIU Liang WANG An-Min ma xiao-san Department of Modern Physics University of Science and Technology of China Hefei 230026. China

We model of intrinsic analyze the time evolution of entanglement of two-qutrit system within the framework of Milburn＇s decoherence. The entanglement evolution relies not only on the parameters of system, but also on the concrete states either pure or mixed. The linear entropy used to measure the extent to which the intrinsic decoherenee affects quantum states is evaluated.

关键词： intrinsic decoherence Milburn's model time evolution of entanglement

Entanglement Evolution of a 2-Qutrit System Interacting with a Fermionic Bath

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Communications in Theoretical Physics 2005年第2X期44卷 274-278页

作者： ma xiao-san WANG An-Min YANG xiao-Dong XU Feng Department of Modern Physics University of Science and Technology of China Hefei 230026 China

Based on the algebraic entanglement measure proposed [G. Vidal et al., Phys. Rev. A 65 (2002) 032314],we study the entanglement evolution of both pure quantum states and mixed ones of 2-qutrit system in a symmetrybroken environment consisting of a fermionic bath. Entanglement of states will decrease or remain constant under the influence of environment, and the class of states which remain unchanged has been found out.

关键词： entanglement evolution 2-qutrit state fermionic bath

Entanglement Dynamics of Multipartite Systems Under Decoherence from a Spin Environment

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Communications in Theoretical Physics 2006年第1X期46卷 73-76页

作者： XIE Guo-Qiu WANG An-Min ma xiao-san Department of Modern Physics University of Science and Technology of China Hefei 230026 China Department of Electronic Information and Engineering Huangshan University Huangshan 245000 China

The entanglement evolution of multipartite quantum states under a spin environment is analyzed. Due to interaction, the extent to which the entanglement vanishes depends not only on the size of system and the structure of quantum states, but also on the exchange couplings with environment. The decoherence-free subspaces have been identified by using the linear entropy.

关键词： entanglement dynamics decoherence a spin environment

Voltage-Controlled Scattering of Single Photons in a One-Dimensional Waveguide

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Chinese Physics Letters 2011年第7期28卷 148-151页

作者： LUO Ya-Qin SONG Yan-Yan GU Ling-Ming LANG Jia-Hong ma xiao-san School of Electrical Engineering&Information Anhui University of TechnologyMaanshan 243002

We investigate theoretically the voltage-controlled single-photon transport properties in a one-dimensional *** transmission and reflection amplitudes are obtained by a full quantum-mechanical *** is revealed that one can control the single photon transmitted or reflected by adjusting the bias *** scheme may have applications in the design of optoelectronic devices.

关键词： Waveguide optoelectronic photon

Research on Angular Output Velocity of a Drive Shaft with Double Cross Universal Joints

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维普期刊数据库

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International Journal of Plant Engineering and management 2011年第2期16卷 119-124页

作者： ma xiao-san YU Zhi-fu HAN Yan School of Mechanical and Electrical Engineering Hebei University of Engineering Handan 056038 P. R. China

The study object is the angular output velocity of the drive shaft which is made up of two series-wound cross universal joints. We have deduced the function relation between the angular output velocity and initiative input angle of the drive shaft with double cross universal joints that is based on the calculation formula of the angular output velocity of a single cross universal joint, and by analyzing the relation between the two input angles. By using this function relation, the constant velocity condition of the drive shaft with double cross universal joints＂ is verified. The step-by-step searching algorithm is adopted to obtain the optimal phase angle that leads to the minimum fluctuate index of the angular output velocity in the vary velocity condition. At the same time, we worked out the maximal and minimum value of the angular output velocity, and their initiative input angle. The correctness of the function of the angular output velocity and the step-by-step search algorithm are verified by an ADAMS simulation example.

关键词： drive shaft with double cross universal joints angular output velocity initiative input angle phaseangle step-by-step searching algorithm ADAMS

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费米环境中两个三能级原子系统的纠缠演化

物理学报 2008年第4期57卷 2026-2030页

作者：马小三王安民中国科学技术大学近代物理系

利用负性纠缠度(negativity)研究了两个三能级原子系统在费米环境中的纠缠演化问题.结果表明,两个三能级原子系统的纠缠演化不仅依赖于系统和环境的相互作用强度,而且还依赖于系统所处的具体量子态.通过例子发现,系统和环境相互作用强... 详细信息

利用负性纠缠度(negativity)研究了两个三能级原子系统在费米环境中的纠缠演化问题.结果表明,两个三能级原子系统的纠缠演化不仅依赖于系统和环境的相互作用强度,而且还依赖于系统所处的具体量子态.通过例子发现,系统和环境相互作用强度越大,纠缠衰减越快;对于纯态,仅当时间趋于无穷时纠缠才被完全破坏;对于混态,则在有限的时间内纠缠即被彻底破坏.通过一般的分析找到了一类免退相干的量子子空间.在这些子空间中,量子态不受环境的影响,故其纠缠不变.研究有助于理解费米环境造成的退相干对玻色系统纠缠的影响.

关键词：费米环境纠缠演化两个三能级原子

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工序尺寸换算中假废品的判定及补救措施研究

工程设计学报 2021年第1期28卷 33-40页

作者：冯文慧马晓三黄河交通学院机电工程学院河南焦作454950 河南理工大学机械与动力工程学院河南焦作454000

在工艺基准和设计基准不重合的情况下,在零件加工过程中采用极值法计算工艺尺寸链时经常会出现工序尺寸不合格而最终设计尺寸可能合格的“假废品”现象。为此,以工艺尺寸链极值法计算的特点为基础,对假废品产生的原因进行了分析。为了... 详细信息

在工艺基准和设计基准不重合的情况下,在零件加工过程中采用极值法计算工艺尺寸链时经常会出现工序尺寸不合格而最终设计尺寸可能合格的“假废品”现象。为此,以工艺尺寸链极值法计算的特点为基础,对假废品产生的原因进行了分析。为了便于在零件加工过程中判定假废品,通过将工序尺寸作为封闭环尺寸,建立并计算新的尺寸链,得到间接保证设计尺寸合格的必要不充分条件,并结合先于工序尺寸生成的组成环尺寸的实际偏差,提出了一种新的判定假废品工序尺寸公差范围的计算方法和流程。为了避免假废品转化为设计尺寸不合格的真废品,提出了一种对后续加工尺寸进行公差压缩的补救措施。根据工艺尺寸链中各组成环尺寸的相互补偿关系,分析了后续加工工序中公差压缩后尺寸极限偏差和公差的计算方法和流程。研究结果可为实际生产中假废品的判定和补救提供指导。

关键词：假废品工序尺寸工艺尺寸链极值法补救措施

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工序尺寸换算中虚公差的产生原因及处理方法

食品与机械 2021年第10期37卷 93-97页

作者：冯文慧马晓三黄河交通学院机电工程学院河南焦作454950 焦作市物料输送设备关键件制造工艺与装备工程技术研究中心河南焦作454950 河南理工大学机械与动力工程学院河南焦作454000

目的:避免工序尺寸换算过程中虚公差现象的产生,提高机械零件加工工艺规程的可执行性。方法:以工艺尺寸链计算中封闭环与各组成环之间的公差分配关系和误差补偿关系为基础,对零件工艺基准和设计基准不重合条件下工序尺寸虚公差产生的原... 详细信息

目的:避免工序尺寸换算过程中虚公差现象的产生,提高机械零件加工工艺规程的可执行性。方法:以工艺尺寸链计算中封闭环与各组成环之间的公差分配关系和误差补偿关系为基础,对零件工艺基准和设计基准不重合条件下工序尺寸虚公差产生的原因和工艺尺寸链的改进方法进行了研究。结果:从封闭环的选择、已知组成环尺寸公差的合理压缩以及根据其他组成环尺寸的实际偏差确定工序尺寸公差3方面,提出了工艺尺寸链处理和改进方法。结论:从以上3方面对工艺尺寸链进行处理和改进,可有效避免工序尺寸虚公差现象的发生。

关键词：虚公差工序尺寸工艺尺寸链公差压缩实际偏差