若干类时滞切换系统的稳定性问题

主要研究了镇定切换系统的鲁棒稳定性问题.用切换lyapunov函数方法,通过定义指标函数,讨论了基于切换lyapunov函数的若干类时滞切换系统的稳定性问题,用矩阵不等式研究了时滞,时滞摄动和不确定时滞的切换系统的鲁棒稳定性.     

提高电工学实验教学效果的探索

为了提高电工学实验教学效果，增强学生的实践动手能力、创新能力，从教学模式、实验课程内容和实验课的合理安排方面作了一些探索和改进。     

20-W sealed-off CuBr vapour laser excited with modified Blumlein circuit

A sealed-off CuBr vapour laser with the maximal average output laser power of 20 W was fabricated and investigated.The corresponding efficiency is 1.2% and the specific average output laser power is 123 mW/cm~3 in an active volume of 163 cm~3.The lifetime of the laser is more than 300 hours operating at 12-15W.     

排列组合与其它知识的交汇

<正>普通高中数学课程标准(实验)指出,要"体现相关内容的联系","提高对数学的整体认识",在此标准的引导下,近几年的高考卷中频频出现相关知识有机整合的新题型,本文以排列组合为例,来聚焦一下高考卷中排列组合与其它知识交汇的例子.     

三角形中的一个定理及应用

1．定理及推论 定理 如图1，在△PAB中，M是边AB上任意一点，Q是PM上的任意一点，过点Q任作一条直线交边PA，PB于A′，B′，若PA=xPA,PB=yPB,     

可做复读机的多功能数字答录机

<正> 多功能数字答录机由DSP模块、电话线接口、音频放大电 路、键盘、指示灯、 输入/输出口及电 源电路等组成,见 图1。     

Phase Control of Few-Cycle Coherent Terahertz Radiation Pulses

We report a method to control the carrier-envelope phase shift in nearly single-cycle coherent terahertz (THz) radiation pulses, in which we used Kerr effect and two-photon absorption in the generated crystals due to the pump beam peak intensity. Dependence of relative carrier-envelope phase shift of THz pulses on the pump beam intensity in the ZnTe crystal was measured experimentally. Under our experimental condition, we measured that maximum relative phase shift is 0.29 radians.     

智能中成药推荐系统设计

针对目前医疗资源分布不均的现状,文章设计了识药通小程序,能通过体质测评、辨证推荐、中药查询、交流论坛等功能指导用户合理用药,避免患者因缺少中医药知识而在自我药疗的过程中遭受二次伤害。小程序实现了基于用户病症和体质推荐用药的功能,辅助患者自主购药,防止在就医困难的情况下延误病情。     

基于AI+大数据的4G/5G无线基站智能协同节能系统的研究和应用

提出了一种利用AI算法和无线网络性能数据，建立了一整套4G/5G无线小区的业务量评价及MR覆盖评估体系，实现在线识别低价值的小区，并在不影响用户感知的前提下，对其实施小区关断、深度休眠等综合节能管控措施。     

Commissioning of electron cooling in CSRm

A new generation electron cooler has started operation in the heavy ion synchrotron CSRm which is used to increase the intensity of heavy ions. Transverse cooling of the ion beam after horizontal multi-turn injection allows beam accumulation at the injection energy. After optimization of the accumulation process an intensity increase in a synchrotron pulse by more than one order of magnitude has been achieved. In given accumulation time interval of 10 seconds, 10⁸ particles have been accumulated and accelerated to the final energy. The momentum spread after accumulation and acceleration in the 10^－4 range has been demonstrated in six species of ion beams. Primary measurements of accumulation process varying with electron energy, electron beam current, electron beam profile, expansion factor and injection interval have been performed. The lifetimes of ion beams in the presence of electron beams were roughly measured with the help of DCCT signal.