排序方式： 共有202条查询结果，搜索用时 203 毫秒
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单源超声雾化室实验系统在制备掺杂薄膜时,由于制备前驱源溶液与掺杂溶液混合在同一个雾化室,几种不同的溶液之间相互影响,对制备高质量的掺杂薄膜非常不利;同时单源超声雾化室的沉积速度较慢,不利于向工业化方向转化;双源超声雾化室避免了在制备掺杂薄膜时掺杂溶液和源溶液混合而互相污染的弊病,从根本上解决了单源超声雾化热喷涂法制备掺杂薄膜存在的问题;同时衬底取向朝下,采用竖直向上的供料方式沉积薄膜,利用重力直接筛选大雾滴,沉积薄膜的雾滴粒径分布更加集中。 相似文献
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整合ACL和NAT的网络安全实验设计 总被引：1，自引：0，他引：1
针对在计算机网络安全实验课程中访问控制列表(ACL)实验和网络地址转换(NAT)实验分散独立的现状,利用华为3Com公司的网络实验设备来实现整合ACL和NAT的网络安全实验,采用2种由易到难的网络拓扑结构,创造性地设计和实现了该实验方案。并且,结合了WWW、Telne、tFTP 3个服务器的安装和配置,以及R IP动态路由配置,既充分地验证实验结果的正确,又让学生深刻地认识了ACL和NAT的原理和作用。 相似文献
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首先分析了单一性计算机开放实验室存在的问题,同时提出综合型计算机开放实验室的改革思路,即建设多功能、多层次的开放实验系统、一体化的共享资源平台、自动化的运行维护模式、统一的实验室管理体制。并以我校计算机实验室的实践,探讨综合型计算机开放实验室的运行机制和管理模式,再从一体化系统、资源共享、管理平台和实验室队伍等方面,进一步阐述创新性实践的建设内容。 相似文献
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叶春红 《涪陵师范学院学报》2011,27(2):148-151
目前,在高校思想政治理论课教育教学改革的时代大背景下,对概论课实施案例教学具有重要的现实意义。在进行案例教学的过程中,必须坚持一定的原则,合理设计教学环节,才能起到良好的教学效果,达到预期的教学目标。 相似文献
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文波 《兰州教育学院学报》2011,27(5):88-90
全球化背景下多元文化的碰撞和激荡使90后的大学生容易陷入身份认同危机。顺应全球化语境,培养大学生的全球化意识实质上是构建一种基于尊重传统文化基础之上的多元文化认同与适应。承认不同文化的普同特性是培养大学生全球化意识的基础;建立以高度的文化自觉和广泛的文化认同为基础的文化安全是保障,最终目的是形成一个和谐发展的文化生态系统。 相似文献
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This paper investigates the problem of mean-square exponential stability for a class of discrete-time nonlinear singular Markovian jump systems with time-varying delay. The considered systems are with mode-dependent singular matrices Er(k). By using the free-weighting matrix method and the Lyapunov functional method, delay-dependent sufficient conditions which guarantee the considered systems to be mean-square exponentially stable are presented. Finally, some numerical examples are employed to demonstrate the effectiveness of the proposed methods. 相似文献
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《Journal of The Franklin Institute》2022,359(2):1522-1543
This paper deals with the output consensus problem for uncertain nonstrict-feedback leader-follower multi-agent systems with predefined performance. A distributed event-triggered control strategy with dynamic threshold is proposed to update the actual control input and alleviate the computation burden of the communication procedure effectively. The unknown nonstrict-feedback structures are addressed by using the property of radial basis function neural networks. It is worth noting that in practical applications, the predefined performance often alternates between constrained and unconstrained cases in some extreme situations. To overcome this challenge, a novel coordinate transformation technique is incorporated to tackle both the two cases with and without performance constraint in a unified manner. As a result, the proposed event-triggered control approach ensures that the output consensus errors converge to zero asymptotically, and all the signals in the closed-loop system are bounded. Finally, the effectiveness of the proposed protocol is demonstrated by the simulation results. 相似文献
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《Journal of The Franklin Institute》2022,359(6):2487-2513
To improve the path tracking control performance of the intelligent vehicle under critical maneuvers, a novel control strategy is introduced in this work. Considering that the tire cornering characteristics show high nonlinearities and uncertainties under those special driving conditions, a three-dimensional piecewise affine (PWA) identification method is proposed to realize the nonlinear modeling of the tire cornering characteristics for the first time. On this basis, the PWA model of the vehicle lateral dynamics is established. To obtain the vehicle target yaw rate for path tracking, a driver direction control model with adaptive preview time is put forward. Then, the linear quadratic optimal control method is further adopted to design multiple path tracking controllers for different working areas of the affine subsystems, thus the optimal steering angles of the front wheels can be generated to guarantee the path tracking performance for the intelligent vehicle under a wide range of driving conditions. Finally, to evaluate the performance of the proposed path tracking control strategy which considers the tire nonlinear cornering characteristics in the PWA form, the CarSim-Simulink co-simulation work is conducted. The co-simulation results show that the proposed control strategy presents significant performance advantages over the other two methodologies and demonstrates satisfactory path tracking control performance. 相似文献
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Event-Triggered privacy-preserving average consensus for continuous-time multi-agent network systems
《Journal of The Franklin Institute》2022,359(10):4959-4975
This paper deals with the privacy-preserving average consensus problem for continuous-time multi-agent network systems (MANSs) based on the event-triggered strategy. A novel event-triggered privacy-preserving consensus algorithm is designed to achieve the average consensus of MANSs while avoiding the disclosure of the agents’ initial states. Different from the approaches incorporating stochastic noises, an output mask function in the proposed algorithm is developed to make initial state of each agent indiscernible by the others. Particularly, under the output mask function, all agents can exactly tend to the average value of initial states rather than the mean square value. Under the proposed algorithm, detailed theoretical proof about average consensus and privacy of the MANSs are conducted. Moreover, the proposed algorithm is extended to nonlinear continuous-time MANSs, and the corresponding results are also derived. A numerical simulation eventually is performed to demonstrate the validity of our results. 相似文献