胶囊内窥镜的无线能量传输系统优化设计

随着无线胶囊内窥镜的发展,无线能量传输技术越来越受到人们的关注.无线能量传输技术在应用过程受到尺寸、安全性等诸多因素的约束,如何在这些约束条件下设计安全、高效的无线能量传输系统是目前研究的重点.提出了磁场均匀度、频率稳定度、三维线圈姿态稳定度和接收能量均匀度等指标来综合评价能量传输系统性能,设计并实现了测试平台来测量这...     

环氧型马来酰亚胺树脂的研究

运用分子设计原理合成了分子骨架中同时含有环氧树脂和马来酰亚胺环的环氧型马来酰亚胺树脂。根据合成中原料配比的不同设计制成了三种ＥＭ树脂，研究了它的反应性和固化树脂的性能。结果表明，ＥＭ树脂具有良好的成型工艺性，优良的力学性能和耐热性且随ＥＭ树脂组成含量的变化而有规律地变化。     

基于IEC 61850的高级配电自动化开放式通信体系

以IEC 61850标准为基础,结合IEC 60870-5-101/104,探讨为高级配电自动化(advanced distribution automation,ADA)建立一套开放式的通信体系,以解决大量配电终端接入的问题。在分析ADA通信需求的基础上,将ADA的信息模型划分为3层,即主站层、馈线层、终端层;阐述了主站与配电终端之间、配电终端与配电终端之间采用的通信网络和信息交换模型。最后分析了ADA通信中用到的关键技术。     

Synthesis of epoxy‐functionalized hyperbranched poly(phenylene oxide) and its modification of cyanate ester resin

High curing temperature is the key drawback of present heat resistant thermosetting resins. A novel epoxy‐functionalized hyperbranched poly(phenylene oxide), coded as eHBPPO, was synthesized, and used to modify 2,2′‐bis (4‐cyanatophenyl) isopropylidene (CE). Compared with CE, CE/eHBPPO system has significantly decreased curing temperature owing to the different curing mechanism. Based on this results, cured CE/eHBPPO resins without postcuring process, and cured CE resin postcured at 230°C were prepared, their dynamic mechanical and dielectric properties were systematically investigated. Results show that cured CE/eHBPPO resins not only have excellent stability in dielectric properties over a wide frequency range (1–10⁹Hz), but also show attractively lower dielectric constant and loss than CE resin. In addition, cured CE/eHBPPO resins also have high glass transition temperature and storage moduli in glassy state. These attractive integrated performance of CE/eHBPPO suggest a new method to develop high performance resins. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012     

雷达探测数据野值剔除方法

为提升雷达探测精度评估中雷达探测导弹目标数据的质量,提出基于滑窗的均值和中值剔除法,并将其 与基于滑窗的多项式拟合法和模板卷积法进行对比分析。通过以3 倍的均方误差作为门限,设置合适的窗口长度, 选取基于窗口滑动的均值或中值剔除法。测试结果表明：2 种方法均可更有效地剔除雷达探测导弹目标数据中的野 值,为后续弹道还原和数据评估提供了有效支撑。     

高炉冷却技术的开发与应用

通过对中小型高型炉寿命的分析，结合河北省冶金设计院高炉设计的实践经验，总结了高炉冷却设备寿命短的原因，并提出冷却设备在材质和结构上的改进措施。     

某柴油机过热故障分析

某水冷柴油机在进行耐久性考核试验过程中,出现曲轴箱废气压力突然升高,排温升高的故障现象。经拆检分析确定了该故障产生的原因是整机过热造成的。为了分析整机过热原因,建立了相应的故障树,通过逐条排查分析,找出了故障发生的根本原因是:由于冷却系统膨胀水箱蒸汽阀密封不严,造成闭式冷却循环系统失效,冷却液汽化,循环系统产生气阻,并最终导致水泵供水量不足,引发柴油机过热故障。故障排除后,整机重新进入考核试验,并顺利通过了耐久性考核,验证了故障定位合理性和所采取措施的可行性。     

Matrix Manipulation of Directly-Synthesized PbS Quantum Dot Inks Enabled by Coordination Engineering

The direct-synthesis of conductive PbS quantum dot (QD) ink is facile, scalable, and low-cost, boosting the future commercialization of optoelectronics based on colloidal QDs. However, manipulating the QD matrix structures still is a challenge, which limits the corresponding QD solar cell performance. Here, for the first time a coordination-engineering strategy to finely adjust the matrix thickness around the QDs is presented, in which halogen salts are introduced into the reaction to convert the excessive insulating lead iodide into soluble iodoplumbate species. As a result, the obtained QD film exhibits shrunk insulating shells, leading to higher charge carrier transport and superior surface passivation compared to the control devices. A significantly improved power-conversion efficiency from 10.52% to 12.12% can be achieved after the matrix engineering. Therefore, the work shows high significance in promoting the practical application of directly synthesized PbS QD inks in large-area low-cost optoelectronic devices.     

Synergistic Dielectric–Magnetic Enhancement via Phase-Evolution Engineering and Dynamic Magnetic Resonance

Dielectric polarization and magnetic resonance associated with intrinsic constituent and extrinsic structure are two kinds of fundamental attenuation mechanisms for microwave absorbers, but remain extremely challenging in revealing the composition-morphology-performance correlation. Herein, hierarchical MXene/metal-organic framework derivatives with coherent boundaries and magnetic units below critical grain size are constructed to realize synergistic dielectric–magnetic enhancement by phase-evolution engineering and dynamic magnetic resonance. Specifically, phase-evolution induced inseparable interfaces, diverse incompatible phases, and defects/vacancies contribute to dielectric polarization, while closely distributed magnetic units simultaneously realize nanoscale multi-domain coupling and long-range magnetic interaction. As results, the hierarchical derivatives promise an exceptional reflection loss of −59.5 dB and an effective absorption bandwidth of 6.1 GHz. Both experimental results and theoretical calculations indicate that phase-evolution engineering and dynamic magnetic resonance maximize the absorption capability and demonstrate a versatile methodology for manipulating microwave attenuation. More importantly, the proposed multi-domain coupling and long-range magnetic interaction theories innovatively offer dynamic magnetic resonance mechanism for magnetic loss within critical grain size.     

基于CSCW的CAD系统协作支持技术与支持工具的研究

计算机支持的协同工作（CSCW）给CAD技术带来重大发展，但仍然存在许多问题。其中之一是缺乏将协作性能同应用功能有机结合的方法。文中在分析的现有协作支持技术，工具和系统不足的基础上，提出了用协作支持工具软件CoCADToolAgent改造商品化CAD系统来开发CSCD系统的新思路和总体技术路线，给出了通讯支持，协议，一致性维护和并发控制，协同感知，任务和脚色机制的有效的实现方法，作为本方法的一个应用实例，成功地将传统的人机交互式CAD系统AutoCAD转变为网络环境下支持人人交互的CSCD原型系统，作为专用协作支持工具，CoCADToolAgent比NetMeeting之类的通用协作支持工具具有更好的协作性能，该方法可推广到三维CAD系统。