三峡水库港口岸坡排水方案优化研究

分析了三峡库区库岸的渗流自由面随库水位升降的变化规律,根据库区岸坡不同地层构造,提出了以网络盲沟、虹吸排水技术为代表的排水技术措施,明确了虹吸排水最大吸水高度8.0m的工程应用界限,创建的多级串联虹吸排水技术首次应用于库区港口岸坡稳定性方案设计,解决了库水位陡降条件下的岸坡同步排水降压和稳定安全的难题,对三峡库区岸坡失稳破坏等地质灾害防治和港口同步排水降压具有指导性意义。     

叠加式串联型直流稳压电源

提出了一种低纹波、高效率的直流稳压电源－叠加式串联型直流稳压电源，以弥补串联型和开关型直流稳压电源的不足。     

浮体式水电阻的设计与制作

文章旨在为船厂实现大功率设备的负荷试验,在对比传统负荷试验设备优缺点的基础上,阐述了大功率负荷试验设备的改进方法,并以烟台打捞局船厂建造的3 600t打捞工程船为例,给出了浮体式水电阻制作的设计方案。通过试验证明,该方案达到了大功率设备负荷试验的要求,并且改变了传统的船舶下水后进行负荷试验的方法,缩短了船舶下水调试周期,提高了码头利用率。     

实施串联造船 缩短船坞周期

本文通过总结我厂首次串联造船特点和以往船坞造船经验,结合现有吊机资源和大合拢作业方法,研究探索,提出船坞串联造船改进方案,以此来缩短船体建造周期,凸显串联造船的优势。     

“同城时代”即将到来沪杭高铁串联长三角城市群

沪杭城际高速铁路是中国“四纵四横”客运专线网络中沪昆客运专线的一个组成部分。该工程连接上海、杭州两大城市，由上海虹桥站引出，经松江南、金山北、     

韶山4改型机车牵引电机固定分路电阻发红故障的分析及处理

对韶山4型电力机车牵引电机固定分路电阻发红现象进行分析,并描述机车故障时其它伴随的现象,从该电阻的阻值和通过的电流变化,分析电阻功率增大的原因,并提出相应的解决措施。     

Rapid quantification of the metabolite of valacyclovir hydrochloride in human plasma by liquid chromatography-tandem mass spectrometry

Objective To establish a rapid, sensitive and selective liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the determination of acyclovir (the metabolite of valacyclovir hydrochloride) in human plasma. Methods After addition of ganciclovir as internal standard (IS), plasma samples were prepared by one-step protein precipitation using acetonitrile as precipitant, followed by an isocratic elution with 0.1% formic acid 3.5μm) column. Detection was performed on a triple-quadrupole mass spectrometer utilizing electrospray ionization (ESI) interface operating in positive ion and selected reaction monitoring (SRM) mode with the precursor to product ion transitions m/z 226.2→152.1 for acyclovir and m/z 256.2→152.1 for the IS. Results The analytical results demonstrated a good linearity over the ranges from 0.005 to 4μg/mL (r=0.9999) for valacyclovir hydrochloride. The relative standard deviations (RSD) of intra-batch and inter-batch were less than 4.06% and 9.23%, respectively. The limit of detection and lower limit of quantification in human plasma were 2ng/mL and 5ng/mL, respectively. Conclusion The method was simple, sensitive, accurate and reproducible and has been successfully applied to a bioequivalence study of valacyclovir hydrochloride capsules in Chinese healthy male volunteers.     

基于RBF神经网络的TCSC自适应PID控制

针对可控串联补偿(Thyristor Controlled Series Capacitor,TCSC)的传统PID控制器存在鲁棒性差和自学习能力不强的问题,利用径向基函数(Radial Basis Function,RBF)神经网络可以无限逼近非线性系统的特性,提出了一种基于RBF神经网络设计的TCSC自适应PID控制器.该自适应PID控制器不仅具有传统PID控制器结构简单、易于工程实现等特点,而且通过RBF神经网络辨识的被控系统Jacobian信息来在线实时调整PID控制的参数,对被控系统参数和运行状态改变有较强的适应性,克服了常规PID控制器鲁棒性不强的缺点.两机五节点系统和四机两区域系统的仿真结果表明所设计的控制器控制效果明显优于传统PID控制器,具有较好的适应性和鲁棒性,对系统低频振荡的阻尼特性有很大地改善.     

3D numerical modeling of wave forces on tandem fixed cylinders using the BEM

In this paper a 3D numerical model was developed to study the complicated interaction between waves and a set of tandem fixed cylinders.The fluid was considered to be inviscid and irrotational.Therefore,the Helmholtz equation was used as a governing equation.The boundary element method（BEM） was adopted to discretize the relevant equations.Open boundaries were used in far fields of the study domain.Linear waves were generated and propagated towards tandem fixed cylinders to estimate the forces applied on them.Special attention was paid to consideration of the effect on varying non-dimensional cylinder radius and distance between cylinders,ka and kd on forces and trapped modes.The middle cylinder wave forces and trapped modes in a set of nine tandem cylinders were validated utilizing analytical data.The comparisons confirm the accuracy of the model.The results of the inline wave force estimation on n tandem cylinders show that the critical cylinder in the row is the middle one for odd numbers of cylinders.Furthermore the results show that the critical trapped mode effect occurs for normalized cylinder radiuses close to 0.5 and 1.0.Finally the force estimation for n tandem cylinders confirms that force amplitude of the middle cylinder versus normalized separation distance fluctuates about that of a single cylinder.