“亚通”号客船的总体设计与试验情况

本文阐述了“亚通”号客船的总体设计思想及其概况，并就其试航结果进行了具体的分析。     

城市客运交通系统结构可持续发展的机理分析

通过运用系统动力学,从宏观角度研究客运交通系统结构内部各要素之间的关系,有助于找出城市客运交通系统结构内部复杂的反馈机制,同时通过调节系统内部机制可达到系统的优化.因此,对于城市交通可持续发展战略而言,运用系统动力学不失为一种科学、有效的研究手段.     

直流开关电源纹波分析

对城市轨道交通通信设备的开关直流电源中产生纹波的多种原因进行了定量分析，提出了相应的抑制措施，并且在实验中验证了其方法的有效性和实用性。     

GM(1,1)灰色模型优化方法研究

基于传统GM(1,1)灰色模型适用范围有限和预测精度较低的问题,提出了实测数据恒正凹化处理和相邻均值法(序列相邻数值取平均值)结合建模的新方法。该方法能够将原始数据序列转化为指定形式,利用数据相邻均值与时区长度。应用结果表明:优化后的GM(1,1)模型对数据兼容能力更强,对于发展速度"先快后慢"且波动性较小的稳定序列,该模型能够提高数值拟合精度,延长预估范围,可用于中长期预测,并且优化模型数值还原无需迭代累减,计算过程更加简便,为灰色模型的改进提供一定的参考价值。     

关于路内停车问题的反思

路内停车与路外停车作为城市停车系统的两种表现方式,各自都具有不同的功能与作用,简单地单方面弱化任何一种停车形式都会削弱整个城市停车系统的停车效率和效益,而且,在某些条件下,路内停车具有路外停车不可替代的功能和作用.故在城市停车系统中,应让二者各自发挥不同的作用,相互协调与补充.     

应用碎石桩与CFG桩联合处理可液化地基方法研究

首先阐述碎石桩和CFG桩各自的特性和共同作用机理,同时结合工程实践,表明此组合型复合地基在处理可液化地基时可充分发挥碎石桩与CFG桩的各自优势,达到既消除液化又能较大程度地提高地基承载力的目的,对处理要求承栽力较高的可液化地基是一种安全、可靠、经济的组合型复合地基.     

Monitoring Thermal Coagulation with Ultrasonic Textures

The feasibility of using B-mode ultrasound image textures and pattern recognition technique to characterize the thermal coagulation in vitro during radiofrequency ablation was investigated. The changes of ultrasonic textures in the different regions of samples varied with the heating time in the in-vitro experiments, which would result in that the coagulated and noncoagulated regions of tissue had different ultrasonic textures. Using support vector machine to extract the ultrasonic texture features and characterize the state of tissue, the size and boundaries of thermal lesions could be detected and measured more exactly than only using the gray scale information of B-mode ultrasound image. The proposed method would be applied to the image-guided radiofrequency ablation (IGRA) procedure for monitoring the thermal coagulation.     

Adaptive control of active balancing system for a fast speed-varying Jeffcott rotor with actuator time delay

Due to actuator time delay existing in an adaptive control of the active balancing system for a fastspeed-varying Jeffcott rotor, if an unsynchronized control force (correction imbalance) is applied to the system,it may lead to degradation in control efficiency and instability of the control system. In order to avoid theseshortcomings, a simple adaptive controller was designed for a strictly positive real rotor system with actuatortime delay, then a Lyapunov-Krasovskii functional was constructed after an appropriate transform of this sys-tem model, the stability conditions of this adaptive control system with actuator time delay were derived. Afteradding a filter function, the active balancing system for the fast speed-varying Jeffcott rotor with actuator timedelay can easily be converted to a strictly positive real system, and thus it can use the above adaptive controllersatisfying the stability conditions. Finally, numerical simulations show that the adaptive controller proposedworks very well to perform the active balancing for the fast speed-varying Jeffcott rotor with actuator timedelay.     

长三角地区电力电子技术发展及应用

首先简述了长三角地区经济发展状况,概述了电力电子技术的发展史、热点技术、高新技术、新能源与节能的关键技术.并对工业上的380 V通用变频技术、高压变频技术、分布式发电系统的功率变换技术及城市轨道车辆中电力电子技术作了介绍.最后对电力电子技术应用中的永磁电机的发展作了简单的陈述.