排序方式: 共有49条查询结果,搜索用时 15 毫秒
1.
孙银祚 《聊城大学学报(自然科学版)》1997,(4)
着重分析了目前数字电路实验中CP脉冲信号源的脉冲抖动问题,提出消除脉冲抖动的单一脉冲信号产生的方法. 相似文献
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本文介绍一种适用于双反星形带平衡电抗器整流电路的触发器,并对其工作原理进行了较为详细的分析。 相似文献
3.
A Trigger of Coupled Singularities 总被引:3,自引:0,他引:3
By using example of nonlinear dynamics of a pair of coupled gears, the phenomenon of appearance and disappearance of a trigger of coupled singularities and homoclinic orbits in the form of number eight in the phase portrait in the phase plane is investigated. That phenomenon is an accompanying phenomenon of loss of stability of the local unique equilibrium position. For a generalized case under certain conditions, a theorem of the appearance of a trigger of coupled singularities in a nonlinear dynamical conservative system, the first derivative of the system potential energy which is a product of two periodic functions with different periods, and one bifurcation parameter, which is the cause for the appearance of new roots of these two functions, is defined. 相似文献
4.
Katica Hedrih 《Nonlinear Analysis: Hybrid Systems》2008,2(2):310-334
A survey in the form of a review of the author’s research results in the area of dynamics of coupled rotations and coupled systems is presented. The theorem on the existence of a trigger of the coupled singularities and the separatrix in the form of the number eight is presented with a few examples of coupled rotations of the simple systems with debalances. Also, a survey of models and dynamics of coupled systems composed of a number of deformable bodies (plates, beams or belts) with different properties of materials and discrete layer properties is presented and mathematically described. The constitutive stress–strain relations for materials of the coupled sandwich structure elements are presented for different properties: elastic, viscoelastic and creeping. The characteristic modes of the coupled system vibrations are obtained and analyzed for different kinds of materials and structure composition. The visualization of the characteristic numbers and modes and eigenamplitude forms are presented. Structural analysis of sandwich structure vibrations is done. 相似文献
5.
马致明 《新疆师范大学学报(自然科学版)》2012,31(4)
针对PPT课件中交互式练习题难以设计的问题,笔者在探索和实践的基础上,总结出了三种不同策略的制作手段,可用于设计单选、判断、复选、填空等各类客观题,从而为广大教师制作高质量的交互式课件提供了一条有效的途径。文中就有关方法及技术做了介绍,并给出了具体实例。 相似文献
6.
555定时器逻辑功能及其应用的探讨 总被引:2,自引:0,他引:2
江静 《华北科技学院学报》2005,2(3):101-104
以5G555定时器为例,分析了TTL型555定时器的电路结构与逻辑功能,进而以5G555定时器构造了施密特触发器,并给出其在波形变换、脉冲整形及幅值鉴别等方面的工作波形。 相似文献
7.
A series of random copolymers(PCLAs) were synthesized by ring-opening polymerization of D,L-lactide(LA)and ε-caprolactone(CL) with different molar ratios. PCLA based polyurethanes(PCLAUs) were obtained by chain-extending of PCLA and polytetramethylene ether(PTMEG) with hexamethylene diisocyanate(HDI). All the PCLAUs exhibit good shape memory properties with high shape fixity ratios above 98% and shape recovery ratios above 82% in the first cycle and 91% in the second cycle. PCLAUs with less CL content show faster recovery speed and PCLAUs with more CL content show higher shape recovery ratio. The trigger temperature can be tuned or controlled around body temperature by adjusting the molar ratio of LA to CL. The PCLAUs have potential applications in implant biomedical devices, especially for minimally invasive deployable devices. 相似文献
8.
设计并调试了闪光二号加速器气体主开关同步触发系统。该系统主要由同步控制部分和高压脉冲形成部分构成。整个触发过程包括同步信号的引出、整形滤波、快速比较电路传输、前级脉冲形成、高压脉冲产生。通过对同步信号的整形处理,解决了发生器电流上的高频信号干扰问题;经过快速比较电路和前级脉冲后,选取了同步信号开始工作的时间点,并形成十几V的触发信号;高压脉冲形成部分主开关采用场畸变结合预电离的方式,该结构的气体开关时间响应为50 ns,抖动小于5 ns,满足使用要求。调试结果表明:该系统输出脉冲电压幅值100 kV,前沿小于10 ns,系统的工作时延440 ns,抖动13.5 ns;可通过增加电缆长度来控制触发信号到达气体开关的时刻,实现气体主开关与Marx发生器的延时同步工作。 相似文献
9.
本文介绍了一台供研究准分子气体激光器用的强流脉冲电子束加速器,其输出电压为500kV,束流50kA,脉冲宽度60ns,运行稳定,控制可靠,是一台小型可移动的电子加速器。文中还给出了它的结构参数,主要特点和调试结果。 相似文献
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