基于VHDL的开关消抖电路的研究

介绍了3种开关消抖方案的工作原理,给出了基于VHDL的相关实现程序和测试结果,并就结构、抗干扰、时序配合等方面对电路性能进行分析讨论。电路实用性强,对学生设计电路有一定的启发引导。     

模糊切换方式下的复合控制

设计与分析了交流伺服系统FZ-PID的复合控制原理,针对阀值切换所存在的缺陷提出了一种基于模糊规则切换的复合控制器.实验结果表明基于模糊切换方式下的交流伺服系统具有较快的速度响应、较高的稳态精度和较小的超调,并实现了两种控制的平滑过渡.     

GTPase activating proteins: structural and functional insights 18 years after discovery

The conversion of guanosine triphosphate (GTP) to guanosine diphosphate (GDP) and inorganic phosphate (P_i) by guanine nucleotide binding proteins (GNBPs) is a fundamental process in living cells and represents an important timer in intracellular signalling and transport processes. While the rate of GNBP-mediated GTP hydrolysis is intrinsically slow, direct interaction with GTPase activating proteins (GAPs) accelerates the reaction by up to five orders of magnitude in vitro. Eighteen years after the discovery of the first GAP, biochemical and structural research has been accumulating evidence that GAPs employ a much wider spectrum of chemical mechanisms than had originally been assumed, in order to regulate the chemical players on the catalytic protein-protein interaction stage. Received 25 March 2005; received after revision 31 August 2005; accepted 6 September 2005     

智能多通道数字测温仪的研制

本文系统地介绍了智能化多通道测温仪结构性能特点和设计制造方法。文中详尽地阐述了利用微型计算机处理热电偶参比端温度全补偿和热电偶特性线性化的原理、方法和实用软件,并对测温仪的误差进行了较为详细的分析。实践结果表明该装置简单,精度高,抗干扰能力强,具有实用价值。     

Photodegradation of 17α-Ethynylestradiol in Aqueous Solution with Nitzschia hantzschiana or Chlorella vulgaris and Fe^3＋

0　IntroductionTherehasbeenincreasingconcernabouttheenvironmentaleffectsofoestrogensandxenoestrogens[1 ] .17α ethynylestradiol(EE2 ) (Fig .1)isasyntheticestrogenicsteroidthathastherapeuticuses (e.g .Oralcontraception) .Syntheticestrogensaregenerallymorestableinwaterthannaturalestrogensandhavegreaterpotency.Theyaredifficulttobeabsolutelyremovedfromwastewatersbyprimaryandsecondarytreatment.Thedegradationchemistryofthiscom poundhasnotbeenextensivelystudied .Therearefewpublishedarticlesstudying…     

"非正常作业进路安全监督装置"的行车应用及改进

通过对“非正常作业进路安全监督装置”的行车应用进行剖析,从行车人员使用的角度探讨了监督设备的功能与局限,分析了原有站场图形结构所存在的不足,提出了原有站场图形结构的改进设计构想。     

超快光导开关及在微波中的应用

本文介绍了超快光导开关的工作原理及其在微波中的应用,并给出了实验结果.     

新型遥调电力负荷定量器的研制

介绍了一种用于对用户电力负荷进行智能管理的新型的遥调电力定量器的研制。叙述了其工作原理、电路结构和程序设计。     

MOS光电开关集成电路

采用电荷积累检测原理构成了ＭＯＳ型单片式光电开关集成电路。该器件具有低功耗、低成本、多功能的特点。文章还对器件的应用情况作了介绍。