隔离电源及其在高压氧舱的应用

目的：提高高压氧舱用电安全性，保障高压氧舱安全、稳定运行。方法：对高压氧舱的单相220V供电采用隔离电源方式。结果：隔离电源的使用能显著提高高压氧舱的用电安全性，保证整个供电系统的稳定性、连续性。结论：隔离电源的使用对于保证高压氧舱的安全运行十分必要。     

一种分布式发电并网变流器测试装置设计方案及实现

提出了一种用于分布式发电并网变流器测试的波动电压发生装置方案，解决了分布式发电并网变流器在实际电网中不易测试的难题。该装置基于级联H桥拓扑，其电压等级可拓展，可高精度地输出频率为0.5～25Hz和波动幅值为0～10%基波电压幅值的波动电压，可模拟不平衡度可调节的三相不平衡电网，不平衡度范围为0～10%。它可以完成并网变流器对电网电压幅值和频率偏差，波动电压以及电网不平衡的适应能力等多种测试。本文分析了装置的工作原理，并以基于本文所提出装置拓扑的“35kV-6MW风机变流器低频扰动测试装置”上进行的现场实验为例，充分证明了这种波动电压发生装置用于分布式发电并网变流器测试的可行性和有效性。     

改进型肱骨逆行旋入钉的生物力学测试及临床应用评估

背景：昆明医学院附属延安医院骨科设计的肱骨旋入式自锁髓内钉，多方面均优于现有国内外设计的带锁髓内钉，但顺行旋入式髓内钉与传统带锁髓内钉普遍存在肩袖损伤和肩关节功能活动障碍，而逆行旋入式髓内钉则彻底解决了这一难题。 目的：根据初期设计的逆行旋入钉存在的问题，结合肱骨解剖特点和临床实践，进行改进与完善工作，力图从根本上解决原逆行旋入钉髓内固定存在的若干问题，以利于进一步临床应用与推广。 方法：根据肱骨的解剖学特点，利用肱骨尸体标本进行相关生物力学测试。并应用改良后的逆行旋入钉治疗73例肱骨骨折患者，观察旋入钉与原型钉在抗轴向压缩、抗拉伸、抗扭转、抗弯曲方面的不同之处及生物力学测试结果和纳入患者的临床疗效。 结果与结论：改进后旋入钉在抗轴向压缩、抗拉伸、抗扭转、抗弯曲4个方面均优于原型钉，两者比较差异均有显著性意义(P < 0.01)。患者随访3~48个月，均愈合良好，置入后无感染、金属断裂、内固定松动等并发症。提示，改进型逆行旋入钉生物力学测试更合理，且操作简便，并发症少，具有广泛的临床应用前景及推广价值。     

Hybrid predictive control of a DC–DC boost converter in both continuous and discontinuous current modes of operation

Developing efficient and appropriate modeling and control techniques for DC–DC converters is of major importance in power electronics area and has attracted much attention from automatic control theory. Since DC–DC converters have a complex hybrid nature, recently several techniques based on hybrid modeling and control have been introduced. These techniques have shown better results as compared with conventional averaging‐based schemes with limited modeling and control abilities. But the current works in this field have not considered all possible dynamics of the converters in both continuous and discontinuous current modes (CCM, DCM) of operations. These dynamics are results of controlled and uncontrolled switching phenomena in DC–DC converters. This paper proposes a new switching scheme for modeling and controlling a DC–DC boost converter. The converter is represented as a hybrid automaton by considering the all three possible modes. The hybrid automaton is translated into the mixed logical dynamical (MLD) mathematical framework. The switching among these modes is generated by hybrid predictive control method which is calculated by Mixed Integer Quadratic Programming (MIQP). Using the exact model of the converter, the proposed switching algorithm can globally control the converter in all operation regimes, including CCM and DCM operations, considering all constraints in the physical plant, such as maximum inductor current and capacitor voltage limits. The switching algorithm is applied to a real converter circuit, modeled with various parasitic components. Simulation results are provided to show the advantages of the proposed control scheme. Copyright © 2010 John Wiley & Sons, Ltd.     

基于LabVIEW平台的数据采集系统的研究

主要研制了基于LabVIEW（一种可视化图形编程语言）平台数据采集系统的硬件部分，即数据采集与控制系统。本系统包括信号的选择、程控放大、滤波、限波及A／D与D／A等，具有8路低频信号的选择、8种倍数的程控放大、1000Hz工频滤波、50Hz工频陷波、及A／D与D／A转换等功能。     

医用滤线栅物理性能微机测试仪的研制及应用

为快速、准确地检测医用X线滤线栅的质量和使用效果，我们研制了滤线栅物理性能微机测试仪。该仪器在微机控制下，对各个性能参数实现自动测量，测试结果精确，测量效率高，排除了人为因素的干扰。实用表明，效果很好。     

单相直接AC-AC变换器的实现与分析

针对传统AC－DC－AC交换存在的缺陷，采用高频调制直接AC－AC变换技术，实现了两种不同结构的单相AC－AC直接变换器，对其特点和仿真结果进行了分析，并探讨了应用前景。     

高精度AD771X系列Σ—ΔA／D转换器校准系数的调整浅析

AD771X系列A／D转换器的3种标准校准模式基本可满足一般应用的要求，但有些特定的场合需要做特殊的调整，本文介绍的两种调整方法经实践证明具有很高的实际应用价值。     

Status of Implantable Energy Systems to Actuate and Control Ventricular Assist Devices

Summary: A major goal of the Devices and Technology Branch of the National Heart, Lung, and Blood Institute (NHLBI) is the development of a family of devices that can be effectively used in the rehabilitation of patients with advanced heart disease. The development of implantable circulatory assist and total heart replacement devices forms a major portion of this goal. A miniature, implantable energy converter is a key to the development of a tether-free, implantable ventricular assist system. This paper defines the energy system design requirements, identifies key subsystems, briefly reviews NHLBI-sponsored research activities, defines the current research status, and identifies current problem areas and research issues.     

An ultrasonic imaging and differential measurement system for the study of fetal respiratory movements

An ultrasonic pulse-echo system is described that is designed for recording and measuring the small differential movements associated with fetal respiratory action. The system uses an electronic, differential, phase-locked loop echo tracker in combination with A-mode and real-time B-mode imaging. Use of the phase-locked loop enables movements to be measured that are more than an order of magnitude less than the spatial resolution of conventional imaging systems. To illustrate the system's capability some preliminary clinical results of fetal respiratory movements and arterial vessel diameter changes, are presented.