Chaotic dynamics of active optical fiber ring resonator with optical injection

We experimentally obtain the route from period doubling to chaos in an active optical fiber ring resonator （AOFRR） with optical injection. The results show that the AOFRR is sensitive to external optical injection and demonstrate various dynamic characteristics. Meanwhile, the change of the injection strength can cause the output of the AOFRR to become periodic or chaotic. It can be confirmed that all the dynamic characteristics of the system are due to the interaction of the semiconductor laser with the erbium-doped fiber amplifier （EDFA）.     

Bidirectional Mapping between a Biphoton Polarization State and a Single-Photon Two-Qubit State

How to manipulate （operate or measure） single photons efficiently and simply is the basic problem in optical quantum information processing. We first present an efficient scheme to transform a biphoton polarization state to a corresponding single-photon state encoded by its polarization and spatial modes. This single-photon state carries both the information of the controlled and target photons. It will make the realization of bipartite positive- operator-valued measurements efficiently and simply. Moreover, the inverse transformation from the single-photon state back to the corresponding biphoton polarization state is also proposed. Using both the transformations, the realization of the arbitrary two-qubit unitary operation is simple with an M-Z interferometer. All the schemes are feasible with the current experimental technology.     

基于毕达哥拉斯犹豫模糊距离测度的灰关联双向投影决策法

为解决多属性决策单方向偏差难题所提出的灰关联投影法尚存在适用性差的技术不足。为此,在借鉴双向投影技术要点的基础上联合新型灰关联系数,并引入毕达哥拉斯犹豫模糊集的表达优势,提出基于毕达哥拉斯犹豫模糊距离测度的灰关联双向投影决策方法。新方法能够有效解决毕达哥拉斯犹豫模糊多属性决策问题,具有较高的分辨度。通过算例应用分析,直接验证了毕达哥拉斯犹豫模糊灰关联双向投影方法的实用性,间接验证了毕达哥拉斯犹豫模糊距离测度和灰关联双向投影法的有效性。     

基于Labview的一级环形倒立摆逆系统轨迹法自动摆起控制

利用求解非线性方程两点边值问题,得到逆系统参考轨迹;通过设计逆系统前馈控制及LQR反馈控制器,对参考轨迹实时跟踪。基于QNET 2.0旋转倒立摆实验平台,采用Labview编程软件,实现了一级环形倒立摆的自动摆起与稳定的实物控制。实验结果证明控制算法的有效性,可以使一级环形倒立摆在一个摆周期内自动摆起,并保持稳定状态。与能量法自动起摆实验比较,逆系统算法具有较好的快速性和稳定性。     

知识依赖与动态模糊数据粗传递

根据实际中经常遇到的信息传递情况:一是我们不能丢失任何可能有用的信息,以免造成损失;二是被传递的概念是双向动态变化的模糊数据,三是信息传递者的知识不同,接收到的数据信息不一样。本文利用具有动态特性的双向S-粗模糊集构建了一种新的动态模糊数据粗传递模型-上近似动态模糊数据粗传递模型,分析了信息传递者的知识对模糊数据粗传递的影响,建立了知识依赖、知识等价、知识独立与传递过程中动态模糊数据变化的关系,得到了动态模糊数据在传递过程中保持不变、发生增益的条件,给出了动态模糊粗传递数据不变定理及数据增益定理,最后给出了动态模糊粗传递模型在风险投资管理系统中应用,制定了符合实际的投资决策。动态模糊粗传递是双向S-粗模糊集的一种新的应用。     

“公司+农户”型订单农业供应链“双向补贴”机制研究

基于订单农业特点,构建“公司+农户”型订单农业供应链决策模型。研究发现,订单农业传统价格机制:按“固定价格”收购、按“市场价格”收购、“随行就市,保底收购”,各具优缺点,但均未能很好地协调此类“公司+农户”型订单农业供应链,我国订单农业违约率也是居高不下。为此,提出一种 “双向补贴”价格机制来协调此类订单农业供应链。本研究结果表明,“双向补贴”价格机制能够很好地弥补了按“固定价格”,“市场价格”收购的缺陷,保证了农户和公司获得相对稳定的收入,提高了“公司+农户”型订单农业供应链的稳定性。同时,实施该协调机制后,改善了公司在“随行就市,保底收购”机制下要承担全部风险的缺陷,公司和农户实现了“收益共享,风险同担”。     

Optical bistability and multistability via amplitude and phase control in a Duplicated two-level system

We investigate the optical bistability(OB) in a duplicated two-level system contained in a ring cavity.The atoms are driven by two orthogonally polarized fields with a relative phase.The OB behavior of such a system can be controlled by the amplitude and the relative phase of the coupling field,and it is possible to switch between bistability and multistability by adjusting the relative phase.     

Null testing toroidal surface and biconic surface with cylinder compensator

Toroidal surface and biconic surface are employed increasingly, however their profile cannot be null tested easily for they are non-rotationally symmetrical. Null testing method with cylinder compensator is proposed to solve this problem. The theory of this method is revealed. The errors of this method are present. Three typical testing optical systems with cylinder compensator are demonstrated at last. The design results and total error indicate that this method is feasible.     

Optical bistability induced by quantum coherence in a negative index atomic medium

Bistability behaviors in an optical ring cavity filled with a dense V-type four-level atomic medium are theoretically investigated. It is found that the optical bistability can appear in the negative refraction frequency band, while both the bistability and multi-stability can occur in the positive refraction frequency bands. Therefore, optical bistability can be realized from conventional material to negative index material due to quantum coherence in our scheme.