星载微波组件微组装技术研究

星载微波组件是天基合成孔径雷达的核心部件,它由许多元器件经过高密度组装而成。针对天基雷达星载微波组件高精度、高一致性、高可靠微组装的技术要求,文中开展了星载微波组件微组装技术研究,重点介绍了低空洞率芯片焊接、低出气率芯片胶接、高可靠引线键合、抗辐照防护设计、低水汽含量气密封装等一系列关键技术,成功研制了高精度、高一致性、高可靠的星载微波组件,满足了某型天基合成孔径雷达的相关技术要求。研究成果为高精度、高一致性、高可靠微波组件的研制奠定了技术基础。     

激光熔覆制备高熵合金的研究现状及发展趋势

高熵合金具有高硬度、高耐磨性、高耐温性及耐腐蚀性,从而成为材料科学领域一个新的研究热点,而通过激光熔覆制备高熵合金的方法是最能达到其优越性能的制备方法之一。文中综述了高熵合金发展历史、组织研究现状、力学性能研究现状以及合金元素和微量元素(如Ti,A l,Si等)对高熵合金组织和性能的影响。在此基础上,提出了研究高熵合金组织性能的方向和途径,并对其应用前景做了分析和展望。     

高动态性能测风传感器的研制

高动态性能测风传感器采用专门研制的高性能工程塑料制作感应元件。结构上的精心设计和合理的制造工艺,使其获得了高的动态性能、高的测量培度、高的可靠性能和好的抗雷电子干扰性能,达到了世界气象组织规定的技术指标,满足了全国气象台站更新换代的使用要求。     

云制造资源虚拟化研究

为实现软硬物理制造资源的全面互联、感知与反馈控制,并将物理制造资源转化为逻辑制造资源,解除物理制造资源与制造应用服务之间的紧耦合,以支持资源高利用率、高敏捷性、高可靠、高安全、高可用的虚拟云制造服务环境,分析了云制造资源虚拟化的相关技术,提出了云制造资源虚拟化框架,论述了虚拟化支持下的云制造关键技术.指出云制造资源虚拟化能够实现更全面和更深入的软硬资源共享;能够形成具有高扩展件和灵活伸缩性的大规模虚拟资源云池;能够按需动态敏捷调配资源,获得资源高利用率并实现节能降耗;能够支持高可靠、高安全的多主体协同运行;能够支持生生命周期用户按需获取普适化的高可用服务操作环境.     

高压差给水调节阀的设计及应用

介绍了高压差给水调节阀的结构特点、工作原理和主要部件的设计,从产品结构、制作工艺、综合性能等方面进行了对比分析,提出了高压差给水调节阀高压差单座密封结构的设计思路。     

高地温隧道大体积薄壳混凝土衬砌施工技术

针对柳城特长隧道穿越高地温地区施工存在温度高、湿度大、高温段落长的特点,系统分析了高地温隧道衬砌的受力特征,提出了高地温隧道隔热和降温综合控制措施,解决了隧道内施工环境恶劣和高温条件下大体积薄壳混凝土的施工难题,为类似工程提供技术支持。     

高真空热泵双效浓缩器

正德众制药机械有限公司开发研制的高真空热泵双效浓缩器(其由高真空喷雾传质式冷凝器与热泵双效浓缩机相配套),改变了传统浓缩的冷凝方式,采用改进后的热泵双效技术,真空度更高,稳定性更好,节能效果显著,特别适合具有皂苷高、含糖高、热敏性强等特点的工艺生产。机组特点:(1)高真空:采用喷雾传质式冷凝器,不需要冷却塔,耗水、耗电少,只需1.5 kW以下水泵真空度在-0.085MPa以下。(2)消泡技术:中药材普遍存在含糖高,含皂苷高,浓缩时易产生泡沫,常出现暴沸、跑料现象,增加了操作难度并降低了生产效率。浓缩器采用喷雾技术,成功解决了浓缩中的消泡问题。     

高真空热泵双效浓缩器

德众制药机械有限公司开发研制的高真空热泵双效浓缩器（其由高真空喷要传质式冷凝器与热泵双效浓缩机相配套）,改变了传统浓缩的冷凝方式,采用改进后的热泵双效技术,真空度更高,稳定性更好,节能效果显著,特别适合具有皂苷高、含糖高、热敏性强等特点的工艺生产。机组特点：（1）高真空：采用喷雾传质式冷凝器,不需要冷却塔,耗水、耗电少,只需1．5kW以下水泵真空度在-0．085MPa以下。（2）消泡技术：中药材普遍存在含糖高,含皂苷高,浓缩时易产生泡沫,常出现暴沸、跑料现象,增加了操作难度并降低了生产效率。浓缩器采用喷雾技术,成功解决了浓缩中的消泡问题。     

折叠式准封离型CO2激光器及其在切割和焊接中的应用

为满足激光切割、焊接对高光束质量激光器的迫切需求,开发了一种折叠式准封离型有自主知识产权的高光束质量、高稳定性、高可靠性、低消耗、长寿命千瓦级CO2激光器.目前已批量生产,成功应用于激光切割与焊接生产,打破了高光束质量激光器长期被国外产品垄断局面.     

华工激光光纤传导激光焊接机亮相2011北京·埃森焊接展——3C制造行业新的“风向标”

随着3C数码行业的发展,3C数码产品朝着高集成化、高精密化方向高速发展,由于其产品内构件越来越小巧、精密,集成度越来越高,所以内结构件对于外观、形变、拉拔力提出了更高的焊接要求。而激光产品由于其高能量、高精度、高方向性的特性,     

H- beam transport experiments in a solenoid low energy beam transport

The Front End Test Stand (FETS) is located at Rutherford Appleton Laboratory and aims for a high current, fast chopped 3 MeV H(-) ion beam suitable for future high power proton accelerators like ISIS upgrade. The main components of the front end are the Penning ion source, a low energy beam transport line, an radio-frequency quadrupole (RFQ) and a medium energy beam transport (MEBT) providing also a chopper section and rebuncher. FETS is in the stage of commissioning its low energy beam transport (LEBT) line consisting of three solenoids. The LEBT has to transport an H(-) high current beam (up to 60 mA) at 65 keV. This is the injection energy of the beam into the RFQ. The main diagnostics are slit-slit emittance scanners for each transversal plane. For optimizing the matching to the RFQ, experiments have been performed with a variety of solenoid settings to better understand the actual beam transport. Occasionally, source parameters such as extractor slit width and beam energy were varied as well. The paper also discusses simulations based on these measurements.     

Modal convection and its effect on the stability of EDM wires

Recently, it has been shown that EDM wires undergo thermal buckling at low axial transport speeds and a series of transport instabilities at high axial transport speeds. Hence, only intermediate speeds ensure the straight wire configuration, which is needed for high-accuracy cutting. These conclusions are based on the assumption that the convective heat transfer coefficient remains piecewise constant along the length of the wire. However, a recent study on convection from a vibrating, flexible body shows that the convection coefficient becomes modal. The present study re-examines the wire stability problem with this modal effect in mind. It is shown that at low axial transport speeds, the straight wire configuration may be stable. Its stability hinges on vibration—large amplitude motion implies increased convection and increased stability from thermal buckling. At high transport speeds, the system still undergoes the reported transport instabilities. This work shows that the well-defined intermediate speed range is not so well-defined in the presence of wire vibrations.     

负压钻进水平钻孔浓相气力输送特性的研究

叙述了气体输送特性参数的理论分析,根据一些基本原理导出输送特性参数的计算公式。为了给输送特性参数的试验研究提供基础,通过试验分别研究了影响输送特性的因素,再根据试验数据,考察了输送压力、管径、钻杆角度和输送距离对输送特性的影响。研究与计算表明:输送能力与输送压力之间是近线性关系;较小的角度变化范围下,随着角度的增大,固体颗粒速度减小;发现固气比越大,滑移速度越小;最后通过试验得出:只需要在较小的输送压力下以较低的速度输送煤屑就可以实现高固气比输送,这样不仅能减少系统所需要的动力,而且煤屑输送速度的降低也可以减少对输送管道的磨损。该研究成果对工程应用具有一定的指导意义。     

冷藏运输装备技术研究进展

冷藏运输装备技术研究与发展水平滞后,已成为我国易腐食品流通腐损率居高不下的重要因素,加快开展冷藏运输装备技术的研究,有利于这一问题的解决。本文通过对冷藏运输装备的厢体隔热材料与制造工艺、制冷系统、厢内气流组织与温变特性、空气调节、厢体热工性能、能耗等国内外研究现状综述。指出了未来易腐食品冷藏运输装备技术的重点研究发展方向。     

Apparent thermal conductivity approach at high-temperature measurements of porous materials

The apparent thermal conductivity approach for high-temperature investigations of porous materials taking into account moisture transport, convective and radiative modes of heat transport, phase-change processes and chemical reactions is presented. Methods for the measurement of apparent thermal conductivity as a material characteristic are analyzed. An example of the practical application of the approach is given, for a hybrid-fiber reinforced cement composite exposed to high temperatures up to 1000 °C. The aspects of the utilization of apparent thermal conductivity as a tool in an assessment of porous materials and their multi-layered systems exposed to high temperatures are discussed.     

基于PLC的六自由度起挂车设备系统设计

吊舱运输挂卸设备是一种集成了运输作业、挂载作业及某吊舱拆装所配套的一种关键设备,主要用于某些吊舱转场或运输至某型飞机机翼下方的挂载口。目前国内现有的运输挂卸设备普遍存在智能化不足的缺点。为了提高装卸效率,设计了一种基于可编程逻辑控制器（Programmable Logic Controller, PLC）的新型吊舱运输挂卸设备。该设备通过总线控制的方式来实现多电机联动,结合人机界面的应用,实现了系统在六自由度上高精度调整吊舱姿态的功能。文中研究了起挂车设备系统的组成、硬件设计、程序设计以及调试的过程。     

Transport of intense ion beams and space charge compensation issues in low energy beam lines (invited)

Over the last few years, the interest of the international scientific community for high power accelerators in the megawatt range has been increasing. For such machines, the ion source has to deliver a beam intensity that ranges from several tens up to a hundred of mA. One of the major challenges is to extract and transport the beam while minimizing the emittance growth and optimizing its injection into the radio frequency quadrupole. Consequently, it is crucial to perform precise simulations and cautious design of the low energy beam transport (LEBT) line. In particular, the beam dynamics calculations have to take into account not only the space charge effects but also the space charge compensation of the beam induced by ionization of the residual gas. The physical phenomena occurring in a high intensity LEBT and their possible effects on the beam are presented, with a particular emphasis on space charge compensation. Then, beam transport issues in different kind of LEBTs are briefly reviewed. The SOLMAXP particle-in-cell code dedicated to the modeling of the transport of charge particles under a space charge compensation regime is described. Finally, beam dynamics simulations results obtained with SOLMAXP are presented in the case of international fusion materials irradiation facility injector.     

高分辨扫描显微热象原理的探讨

本文建立了间距小于分子运动平均自由程的两物体间电磁辐射导热模型，并通过对此模型的定量分析，给出了辐射传热与间距和温差之间的函数关系，证明了扫描近场热成象是一种高测温灵敏度，高扫描速率的热成象技术。同时，还提出一种非接触测量表面轮廓的原理。     

胶片速度与张力控制系统

SAR光学处理器为获得高的动态分辨率,需要一套精密的输片机控制系统.它受保证数据胶片和图像胶片平稳、匀速而且同步地运动.为此,我们研制了胶片速度与张力控制系统,其中采用带有复合控制的锁相回路来控制胶片速度,并用同一具高稳定度的标准脉冲信号源来驱动两套输片机,从而使其速度的跟踪误差小于0.3%;还采用了用光电电位器作为位置传感器的张力控制系统,它使整个输片速度范围内的张力波动小于6.8g.本文叙述了上述系统的工作原理、主要性能和达到的指标,给出了实测数据和曲线.     

In situ measurements and transmission electron microscopy of carbon nanotube field-effect transistors

We present the design and operation of a transmission electron microscopy (TEM)-compatible carbon nanotube (CNT) field-effect transistor (FET). The device is configured with microfabricated slits, which allows direct observation of CNTs in a FET using TEM and measurement of electrical transport while inside the TEM. As demonstrations of the device architecture, two examples are presented. The first example is an in situ electrical transport measurement of a bundle of carbon nanotubes. The second example is a study of electron beam radiation effect on CNT bundles using a 200 keV electron beam. In situ electrical transport measurement during the beam irradiation shows a signature of wall- or tube-breakdown. Stepwise current drops were observed when a high intensity electron beam was used to cut individual CNT bundles in a device with multiple bundles.