A Qualitative Perstective on Idempotency Defect of Two Level System Interacting with Laser and Quantized Field

Entanglement due to the interaction of a two level atom with a laser and quantized field is investigated. The role of the nonlinearity due to these interactions is discussed. It is found that the nonlinearity changes strongly the behavior of the entanglement also the detuning parameters have important role in the structure of the measure of entanglement.

The breaking point between fast-and slow-light in a degenerate two-level atomic system

This paper investigates the breaking point between fast- and slow-light in a degenerate two-level atomic system, where fast-light can be converted to slow-light arbitrarily on a single transition line by adjusting the strength of the pumping field. An equivalent incoherent pumping rate is introduced in this simplified theoretical model which exploits the dependence of this feature. The experimental observation is presented as evidence of the breaking point where the injected power is about 0.08 mW.

Quantum Fisher Information of Two-Level Atomic System under the Influence of Thermal Field, Intrinsic Decoherence, Stark Effect and Kerr-Like Medium

In this paper, we have proposed the numerical calculations to study the quantum entanglement (QE) of moving two-level atom interacting with a coherent and the thermal field influenced by intrinsic decoherence (ID), Kerr medium (non-linear) and the Stark effect. The wave function of the complete system interacting with a coherent and the thermal field is calculated numerically affected by ID, Kerr (non-linear) and Stark effects. It has been seen that the Stark, Kerr, ID and the thermal environment have a significant effect during the time evolution of the quantum system. Quantum Fisher information (QFI) and QE decrease as the value of the ID parameter is increased in the thermal field without the atomic movement. It is seen that QFI and von Neumann entropy (VNE) show an opposite and periodic response in the presence of atomic motion. The non-linear Kerr medium has a more prominent and significant effect on the QE as the value of the Kerr parameter is decreased. At smaller values of the non-linear Kerr parameter, the VNE increases, however, QFI decreases, so QFI and VNE have a monotonic connection with one another. As the value of the Kerr parameter is increased, the effect of non-linear Kerr doesn’t stay critical on both QFI and QE. However, a periodic response of QE is seen because of the atomic movement which becomes modest under natural impacts. Moreover, it has been seen that QFI and QE rot soon at the smaller values of the Stark parameter. However, as the value of the Stark parameter is increased, the QFI and QE show periodic response even when the atomic movement is absent.

The Pancharatnam Phase of a Three-Level Atom Coupled to Two Systems of N-Two Level Atoms

In this paper, we present the analytical solution for the model that describes the interaction between a three-level atom and two systems of N-two level atoms. The effects of the quantum numbers and the coupling parameters between spins on the Pancharatnam phase and the atomic inversion, for some special cases of the initial states, are investigated. The comparison between the two effects shows that the analytic results are well consistent.

Two-dimensional atom localization via probe absorption in a four-level atomic system

We have investigated the two-dimensional （2D） atom localization via probe absorption in a coherently driven four-level atomic system by means of a radio-frequency field driving a hyperfine transition. It is found that the detecting probability and precision of 2D atom localization can be significantly improved via adjusting the system parameters. As a result, our scheme may be helpful in laser cooling or the atom nano-lithography via atom localization.

Optical power limiting of ultrashort hyper-Gaussian pulses in cascade three-level system

Propagation of strong femtosecond hyper-Gaussian pulses in a cascade three-level molecular system is studied by solving numerically the Maxwell–Bloch equations by the iterative predictor-corrector finite-difference time-domain method.Optical power limiting behavior induced by strong nonlinear two-photon absorption is observed for different orders of the femtosecond hyper-Gaussian pulses. Pulses of a higher order temporal profile are found to have a wider power range of optical limiting but a larger output saturation intensity. Both the output saturation value and the damage threshold of optical power limiting decrease with pulse duration increasing. The decrease of the pulse area along the pulse propagation is much slower than that obtained from the two-photon area theorem due to invalidity of the slowly varying amplitude approximation and the monochromatic field hypothesis.

The Networked Manufacturing Resources Optimizing Configuration System and Its Partners Selection Method

The three levels optimizing strategy is put forward for the networked manufacturing resources optimizing configuration, namely, the optimizing of a logical manufacturing process, the optimizing of simulation-based integration of process planning and scheduling, and the optimizing of networked production scheduling. Then, the web services-based architecture of networked manufacturing resources optimizing configuration is brought forward. Finally, the key algorithm of the networked manufacturing resources optimizing configuration is discussed, namely, the two phases manufacturing partners selection method, which including the group technology-based manufacturing resources pre-configuration and the genetic algorithm-based executable manufacturing process optimizing.

连续时间门限完全服务两级轮询系统性能分析

为区分业务优先级以及提高系统公平性与稳定性,在简化求解过程的基础上,提出一种连续时间门限完全服务两级轮询系统。系统状态由马尔科夫链得出并根据其建立数学模型,系统的平均循环周期、平均排队队长等性能参数由对数学模型的概率母函数进行求导所得,将求导结果与仿真实验进行对比,验证理论分析的准确性。将该系统与单级系统、其它两级系统进行对比,验证了该系统在保证业务优先级的同时更具公平性与稳定性。

永磁同步风力发电系统的最大功率跟踪模糊分数阶控制

在“双碳”背景下,风电作为零碳电力和新能源发电的主力军,在助力社会全面绿色低碳转型方面发挥了关键性作用。在保证发电稳定的前提下实现风能的最大化利用,提升风力发电系统发电量至为重要。文中针对永磁同一步风力发电系统的最大功率跟踪(maximum power point tracking, MPPT)问题进行研究。首先建立了永磁同步风力发电系统的机理仿真模型,用两电平双PWM全功率换流器连接风力发电机与电网。然后基于以上模型,分别设计了整数阶PI控制器、分数阶PI"控制器、模糊分数阶PP控制器以实现MPPT控制。最后对以上控制策略进行了仿真研究。结果表明,无论在阶跃风速还是随机风速下,模糊分数阶PU控制器相较于其他两种均具有更出色的MPPT性能与更强的鲁棒性。

一类复杂工业过程的数据驱动与PID协调控制

针对一类具有强非线性且难以建立精确数学模型的复杂工业过程,提出了一种基于PID与数据驱动的协调控制策略。在系统初始阶段,采用PID控制方法,不需要建立系统的数学模型,就能获得大量系统输入输出(I/O)数据。在系统稳态阶段,提出了多输入多输出(multiple input multiple output,MIMO)无模型自适应离散终端滑模控制(model-free adaptive discrete terminal sliding mode control,MFA-DTSMC)方法,该方法基于系统的紧格式动态线性化数据模型,且伪Jacobian矩阵(pseudo-Jacobian matrix,PJM)估计算法仅取决于被控对象的I/O测量数据。其次,设计了一种协调控制策略,实现了PID与数据驱动控制器之间的协调控制。以双容水箱液位系统为例进行仿真实验,仿真结果验证了所提控制策略的有效性。

基于扰动观测器的双容液位系统RBF神经网络滑模控制

针对双容液位系统存在的外部扰动、模型参数不确定等问题,设计了一种基于非线性扰动观测器(nonlinear disturbance observer,NDOB)的径向基函数神经网络滑模控制(radial basis function neural network sliding mode control,RNNSMC)方法。建立双容液位系统数学模型,采用积分型滑模面来提高系统的鲁棒性,在常规积分滑模控制的基础上,通过RBF神经网络(RBF neural network,RNN)对系统的非线性函数进行逼近,并设计非线性扰动观测器估计外部扰动,选用Lyapunov稳定性判据证明了控制策略的闭环稳定性。仿真结果表明,所提控制策略与积分滑模控制(integral sliding mode control,ISMC)方法相比,不需要精确的数学模型,且控制精度更高,抗干扰能力更强。

基于系统论的高等学校两级教学管理改革

论述了高等学校实行两级教学管理的重要性,分析了两级教学管理改革现状。基于系统论,以教学管理系统特征为切入点,探讨了系统基本原理、规律及方法在高等学校两级教学管理体制机制建设中的指导意义,从理论和实践双重层面构建了“七位一体”校院两级系统化教学管理模式。认为该模式突出强调人的主体价值,能够有效提升教学管理效能,促进学校治理体系与治理能力现代化。

国网供应链运营中心两级数据管理体系构建及应用

通过梳理国网供应链运营中心数据管理及其运作的相关工作现状及存在问题,结合两级供应链运营中心运作及其数据管理体系在数据贯通及协同、取数逻辑与业务应用、底表关联与应用开发、数据管理及联动机制以及供应链数据质量管理等方面存在的挑战,提出了国网供应链运营中心数据管理的新思路、新模式、新技术和新场景,系统构建了国网供应链两级数据管理体系,具体涉及生成供应链统一业务数据资产目录、搭建国网两级数据管理及协同治理机制、设计供应链业务数据标准及其模型和开展供应链全过程数据可视化管理,并结合浙江电力“两金一款”业务场景进行了数据管理应用,以期为国网供应链运营中心两级数据管理体系构建提供理论依据及其管理实践提供创新方向。

新型电力系统下省间-省内2级市场交易模式设计及出清优化

为实现“碳达峰,碳中和”目标,习近平总书记提出构建以新能源为主体的电力系统。建立面向低碳能源转型的新型电力系统市场交易模式是实现“双碳”目标的重要途径之一。为此,提出省间-省内2级市场交易模式及出清优化模型。首先,分析新型电力系统下高比例清洁能源接入、高比例跨区电力输送以及高比例灵活资源调节的特征并描述其市场交易框架。其次,设计以新能源为主体的省内市场交易,包括年度双边协商/集中竞价交易、月度双边协商/集中竞价交易、月内(多日)交易以及辅助服务交易;设计省间交易模式,包括年度/月度跨省跨区交易、省间购电交易、清洁能源外送交易以及省间调峰辅助服务交易。在满足电力供需平衡的基础上,构建以省内清洁能源消纳量最大为目标的日前市场出清模型和以总成本最小为目标的日内市场出清模型。最后,以某省新型电力系统为例,模拟典型场景下的日前市场交易和日内市场交易,结果表明所提市场交易模式有效地促进了清洁能源消纳,减缓了弃风弃光、拉闸限电等现象的发生,推动了“双碳”目标的实现。

系统平台两级部署架构研究

随着信息技术的发展和企业业务的复杂化,传统的单级部署架构已经无法满足企业的需求。为了提高系统的可用性和可扩展性,越来越多的企业开始采用系统平台两级部署架构。这种架构将系统分为核心系统和边缘系统两个级别。核心系统负责处理企业的核心业务逻辑和数据,边缘系统则负责处理与用户交互的界面和边缘业务逻辑。文章深入研究系统平台两级部署架构的优点、实现方式及应用场景,为企业进行系统架构设计和部署提供理论支持和实践指导。

着眼专业能力提升构建“一体化、二平台、三阶段、四层次”实验教学体系

岗位能力和创新能力是专业能力的重要体现,是胜任岗位任职需要、适应部队建设发展和个人提升的重要支撑。该文以武器发射工程专业人才培养方案为依据,立足实战需求,着眼专业能力提升,构建“一体化、二平台、三阶段、四层次”实验教学体系,实践证明,该体系在提高学员岗位能力和创新能力方面取得较好的效果。

Quantum dynamic behaviour in a coupled cavities system

The dynamic behaviour of the two-site coupled cavities model which is doped with ta wo-level system is investi-gated. The exact dynamic solutions in the general condition are obtained via Laplace transform. The simple analytical solutions are obtained in several particular cases, which demonstrate the clear and simple physical picture for the quan-tum state transition of the system. In the large detuning or hoppling case, the quantum states transferring between qubits follow a slow periodic oscillation induced by the very weak excitation of the cavity mode. In the large coupling case, the system can be interpreted as two Jaynes-Cummings model subsystems which interact through photon hop between the two cavities. In the case of λ≈△〉〉 g, the quantum states transition of qubits is accompanied by the excitation of the cavity, and the cavity modes have the same dynamic behaviours and the amplitude of probability is equM to 0.25 which does not change with the variation of parameter.

面向订单装配系统(ATO)两阶段随机库存优化研究

基于零部件的基本库存水平补货策略,在多周期订单产品需求不确定情况下构建两阶段随机优化模型:第一阶段在需求未知情况下,规划不同零部件基本库存水平决策变量,实现系统收益最大化;第二阶段针对订单交货期约束创新性设计订单指派决策变量,考虑在不确定需求收益和订单延期惩罚情况下,最大化订单期望收益.通过采样获取不同需求场景,并将不确定需求转成期望需求,针对该期望需求下的单阶段确定性模型求解,并与随机模型结果进行对比.数值实验表明,随机模型的优化结果远差于确定性模型,即未知信息具有一定的价值;同时通过对模型中参数的灵敏度分析,得到了实际中提升系统收益的策略.

手术室二级库耗材与配台管理系统的开发与应用

目的探讨运用手术室二级库耗材物联与配台管理系统实行手术室耗材精细化管理创新模式的应用效果。方法在二级库平面布局基础上结合水平回转式智能仓储硬软件,对接手术管理相关系统,设计研发耗材物联与配台管理系统。结果经临床应用,择期手术耗材清单准备用时(p<0.01)、耗材配台准备用时(p<0.01)、术中临时订单响应用时(p<0.01)、术后耗材退库清点用时(p<0.01)、每周盘点耗材盘点用时(p<0.05)等均明显低于系统应用前。结论手术室二级库耗材物联与配台管理系统可优化耗材管理流程,提升作业流程效能,满足术中紧急临需,降低手术安全风险,降低手术运营成本,实现耗材成本管控。

历史视野下的“四级两审制”

2021年启动的为期两年的四级法院审级职能定位改革试点工作即将于2023年下半年到期。改革试点旨在实现四级法院审级职能的分化,对既有的“四级两审制”形成挑战。我国“四级两审制”的形成既有历史的偶然性,也有历史的必然性。自形成以后,其制度内涵发生了变迁,从“强横向关系”向“强纵向关系”或者说从“块块”为主向“条条”为主演进。在此背景下,全国法院自上而下实现司法统一的需求日益迫切。本次改革试点尝试以级别管辖、提级管辖等机制实现“寻常案件压得下去,大案要案提得上来”,将高级别法院(尤其是最高人民法院)的司法资源集中于统一司法。但是,提级管辖机制存在不确定性,增设作为法律审的第三审仍是一个重大而紧迫的课题。