981 resultados para 415
Resumo:
In this paper, a one-way NMOS analog switch featuring a low plug-in consumption is presented. The performances of analog switch, especially the performances of source follower are simulated under different conditions with PSPICE. Simulation results and factors affecting the deviation between input and output are analyzed, some advice on how to reduce the deviation between input and output is given. Ar the end of the paper, voltage relationship between input and output of the analog switch is obtained. Function of first degree, Vout = kVin + V0, is used to approximate the voltage relationship. The simulation results anti the value achieved from the approximation equation are given as well.
Resumo:
介绍了利用LonWorks现场总线技术,实现了一个低成本、高可靠性的HIRFL-CSR电子冷却远程控制系统。
Resumo:
简略介绍了高能质子在半导体芯片中引起单粒子效应的实验测量和理论分析方法,包括核反应分析方法、半经验方法,介绍了质子和重离子翻转截面间的关系,并用重离子实验数据预测器件在质子环境下的翻转率.
Resumo:
描述了一个在 VC+ +环境下开发的 ,用于 HIRFL设备自动巡检和报警的应用软件的研制。方法是建立服务器程序来完成设备参数的获取 ,客户程序即监测程序通过网络自动读取和显示当前 HIR-FL分布式控制系统中所有受计算机控制的设备状态 ,遇见设备故障时自动发出报警。具有响应用户的中断请求 ,选择或屏蔽设备 ,更改设备误差 ,自动存储故障记录等功能
Resumo:
This study reports a method for high-frequency shoot organogenesis and plant establishment of Potentilla potaninii Wolf. Hypocotyl and cotyledon explants of P. potaninii were cultured on Murashige and Skoog (MS) medium supplemented with various concentrations of benzyladenine (BA) and alpha-naphthaleneacetic acid (NAA) to induce adventitious shoot formation for micropropagation. The highest frequency of adventitious shoot regeneration was achieved from hypocotyl and cotyledon explants grown on MS medium supplemented with 5.0 mg l(-1) BA and 1.0 mg l(-1) NAA. The regenerated shoots rooted most efficiently on half-strength MS medium supplemented with 1.0 mg l(-1) NAA and 0.5 mg l(-1) indole-3-acetic acid or indole-3-butyric acid. The acclimatized plants with normal morphology and growth characters flowered and set seeds in the following year.
Resumo:
复杂可编程逻辑器件CPLD是当今应用最广泛的可编程专用集成电路(ASIC)之一,使用一片CPLD可以代替原来用很多器件才能完成的逻辑功能,我们用CPLD来构建数字电路,和常规逻辑器件相比其突出特点是:元件少,成本低,功耗低。ALTERA公司是全球著名的复杂可编程逻辑器件供应商,结合实际工作的需要,我们选用了ALTERA公司的MAXII EPM1270芯片做了一系列实验电路,先后开展的研究工作包括:1.超低频/超大脉宽信号源;2.门延迟产生电路。 这两方面的工作分别在论文的有关专题介绍。超低频/超大脉宽信号源用作为多定标测量数据获取系统的门控信号,主要功能是产生一系列精确度高、稳定性好的低频、超低频/超大脉宽脉冲信号,且可以根据需要选择手动触发单个大脉冲输出。本电路输出脉冲f/T的精确度≤0.02‰,输出脉冲f/T的稳定性≤±0.01‰。基于CPLD设计的超低频/超大脉宽信号源电路只需一片CPLD就可以取代原来用很多逻辑器件才能完成的功能,此外基于CPLD设计的该信号源的最大周期可超过1000s、步进脉宽调节可达T/1000,远远超过用户提出的指标,从而能满足更多的应用需要。 基于CPLD的门延迟产生电路主要功能是对输入信号进行展宽延迟,我们将它做成NIM单宽插件可提供8道信号延迟展宽,支持NIM负信号输入,用于物理实验中的符合测量、多路时间测量系统及能量测量系统中的ADC或QDC门控信号等,替代目前传统同类型的插件GG8000。 目前两个电路都已调试成功,其中超低频/超大脉宽信号源已交付用户使用,获得满意结果