旋转角度对开启式表冷器性能研究

主要研究分析了适用于新型城市轨道交通环境的中立轴自动开启表冷器集成机组,应用计算机模拟技术,研究中立轴表冷器旋转至30°、45°、60°夹角情况下对流经开启式表冷器后空气的温度、速度及阻力的影响,得出整机更省成本与更节能的方法。     

一种提高椭圆聚光腔面轮廓度精度的加工方法

本文介绍了一种提高椭圆聚光腔面轮廓度精度的加工方法,用这种方法加工的椭圆聚光腔的面轮廓度精度达到0.02mm.     

Transient Characteristics of a Two-Phase Thermosyphon Loop for Multichip Module

A new thermosyphon cooling module (TSCM) has been designed, fabricated and tested to cool the multi-chip module plugged into a planar packaging system. The cooling module consists of a cold plate and an integrated condenser. With an allowable temperature rise of 56°C on the surface of the heater, the cooling module TSCM can handle a heat flux of about 2.7 W/cm² using R11 as working fluid. The transient characteristics of the cooling module have been proved to be excellent: that is, when a heat load is applied inside of the system, steady state can be achieved within 10 to 15 minutes. It has been found that the length of the vapor channel between the cold plate and the condenser in addition to the ambient and the condenser temperatures affect the system performance.     

基于LOGO!控制器的发射机冷凝器温度监控系统的设计

通过介绍和分析发射机冷凝器温度的现状及所存在的隐患，本文提出了采用LOGO！控制器设计温度监控系统，对系统的硬件和软件部分进行了选型和设计，并依据实际情况对软件程序进行了技术参数的设置，最后经过仿真，验证了所设计系统的可用性和有效性，达到了对冷凝器温度监控的理想效果。     

金属蒸气激光器窗口污染问题的研究

提出了金属蒸气激光器中金属原子在激光器隔离头中运动的理论模式──无规行走模式．从实验上验证了该模式．在此理论模式的基础上．设计出一种新的抗金属蒸气污染的隔离头．其原理是．在金属蒸气原子无规行走过程中．用多片高凝结系数的金属片来吸附碰撞在它上面的金属蒸气原子．从而实现对窗口的保护作用．还用ＭｏｎｔｅＣａｎｌｏ数值模拟方法．模拟了金属原子的运动，显示了新型隔离头的抗污作用．它的抗污能力比普通的隔离头有明显的提高．     

Adrenaline for the grid [superconducting synchronous condenser]

This paper presents a novel superconducting device that provides essential voltage support. A superconducting synchronous condenser is basically an electric generator that is optimized and operated to act like a capacitor or inductor, providing the grid with reactive power, an abstruse but absolutely vital element in any power system relying on alternating current. The condenser quickly provides large quantities of reactive power to support grid voltage - as much as double the rating for up to a minute from a single unit and to supply controllable continuous-duty reactive compensation for optimizing grid-transmission effectiveness. It promises to do the job more effectively, and possibly more economically, than other solution, especially for industrial voltage flicker applications and voltage regulation of transmission lines with large isolated nodes.     

电容传声器阻抗变换器的设计

电容传声器几乎是所有各类传声器中规格品种最多的。介绍了各类电容传声器阻抗变换器的线路原理。包括最简单的ECM阻抗变换器,JFET设计的共漏、共源阻抗变换器,电子管阻抗变换器,RF射频阻抗变换器等,特别介绍了目前在很多国外电容传声器阻抗变换器设计中出现的新设计：变形的跟随器设计。     

激光器漫反射型陶瓷聚光腔

本文报导一种漫反射型陶瓷聚光腔.还详细介绍了这种新式腔的特点及研制过程,并给出测量结果和实验数据.     

Development of battery charging system for the FE gun system of HVEM

We have developed a reliable and efficient battery-charging system for the field emission (FE) gun system of high voltage electron microscopes, where the operating condition of the whole FE gun system can be controlled and monitored through a bi-directional optical fiber system, and the control and monitoring circuits located on the high potential of 1 MV are driven by rechargeable Ni-Cd batteries. The power transmission from ground to the high potential is performed through filter condenser circuit. Under the condition that the filter condenser current is limited to 0.2 A(rms) (root-mean-square value), it is possible to transmit the maximum power as high as 65 W, which is enough for the daily operation of the FE gun system. The charging circuit has a function of protecting the batteries from over-charging.     

电子束投影曝光装置实验结果分析

主要介绍了电子束缩小投影曝光机的工作原理及其特点，针对在原理论证机上做的实验，着重分析讨论了聚光镜电流的大小对曝光结果的影响。     

火力发电厂凝汽器真空系统氦质谱检漏技术

本文系统地介绍了凝汽器真空系统氦质谱检漏原理和方法。它简便、快速、准确，是一项具有重大现实意义的节能技术。     

高压变频器在电厂凝结水泵的应用

大唐安阳发电有限责任公司利用机组大修机会进行了凝结水泵的变频改造,避免了机组负荷较低时凝结水泵较大的节流损失,既节能降耗,又提高了机组经济效益。     

蒸发冷凝技术在制冷系统中的研究进展

蒸发式冷凝技术采用的是降膜冷却技术,成为近年来发展高效冷凝冷却设备的热门课题。对蒸发冷凝技术在制冷系统中的研究进展进行了综述,提出蒸发冷凝研究存在的问题和今后可能的研究趋势。     

汽车泠凝器风扇电磁骚扰抑制研究

针对某车型冷凝器风扇电磁辐射发射超标的问题，分析了其骚扰产生的机理，找出了电磁骚扰超标的根本原因，提出了抑制电磁骚扰的方法，并进行了试验验证。结果表明，改进后的冷凝器风扇电磁辐射发射完全符合标准要求。     

Impedance matching by series condensers for power receivers of in vivo robotic capsules

An impedance matching technique using series condensers for the power receivers of in vivo robotic capsules is proposed. The power delivery function of the condenser ratio and its optimal ratio are derived. Experimental results validate the derived function.     

强谐波环境下的无功功率补偿技术

非线性功率用电设备产生谐波电流,导致电磁干扰、功率因数降低,由电容器、串联电抗器组成的谐波滤波装置具有谐波滤除和无功补偿两大功能。工作时不会像传统电容器组补偿那样,在提高功率因数的同时对高次谐波进行放大,而是对谐波进行吸收,提高电源质量。在电抗性补偿系统里,根据需要被补偿的功率计算得出电容,串联谐振电路的串联谐振频率由...     

Kälteerzeugung aus Niedertemperaturabwärme

The technical feasibility of utilising 70–90°C waste heat for the production of 0–4°C cold using ejector technology and water as sole refrigerant was successfully tested at a 10 kW pilot installation. Achieving high values for the condenser temperature is critical for process stability at increased ambient temperatures and depends on the specific consumption of motive steam. At the pilot plant the stability limit for 90°C of the motive steam temperature was found to be 29.5°C. Such high condenser temperature values open the possibility to reject condenser heat against air all through the year via a cooling tower. The coefficient of performance (COP) depends on the motive steam temperature and achieved values of 0.23 up to 0.42 at the test rig. Currently the economic competitiveness of the technology is investigated for application in case of milk production at large scale.     

循环冷却水水质对溴化锂吸收式制冷机性能影响的研究

在应用环境较差的情况下,循环冷却水容易在溴化锂吸收式制冷机的吸收器、冷凝器管内结垢。分析冷却水水垢形成的机理,通过分析和计算得出:污垢热阻与管内外对流换热热阻属同一数量级,冷却水结垢后换热系数急剧下降,机组制冷能力急剧衰减,因此应加强对冷却水水质的管理。提出了判断是否结垢的方法。     

心音、脉搏信号采集、调理电路的设计

心音、脉搏是人体生理及病理的两项重要指标,针对这些信号一般比较微弱、且采集过程中也容易受外界干扰等特点,设计开发了一种能提取微弱心音、脉搏信号的电路。该电路采用驻极体话筒和红外光电法提取心音和脉搏信号,并采取了一系列放大、滤波措施,滤除噪声干扰。该电路较好地解决了外界干扰问题,具有采集数据准确可靠,噪声小,成本低等优点。     

驻极体电容传声器专用管及噪声

本文对驻极体电容传声器的原理及噪声作了分析,这将有助于提高它的电特性。