基于IPv6智能节点的弹性重叠网络中间件

结合IPv6和P2P技术,提出了基于IPv6的智能节点弹性重叠网络中间件的设计方案,定义了该中间件系统的功能,给出了系统框架结构,讨论了智能节点的功能和扩展机制,设计和实现了节点发现机制。     

HNC问答处理系统关键算法研究

HNC问答处理系统是一种崭新的问答处理模式,与传统的问答处理系统相比,它把对语言的处理深入到语言概念空间中进行,以求尽可能地减少语言中的同义和多义模糊。本文在介绍HNC问答处理系统整体构架的同时,设计和实现了问答系统中的3个关键算法,服务于问答系统的不同阶段处理需要。实际应用表明,在这些算法指导下的HNC问答处理系统具有良好的问题处理能力。     

基于Lexra网络处理器的家庭网关QoS研究

家庭网络多媒体正成为网络主要推动力,而家庭网关成为家庭网络的核心设备。该文完成了基于Lexra网络处理器家庭网关设计,并讨论了网关QoS设计原则,在路由和队列调度层面上实现了QoS保证,并在实际项目中验证了QoS性能。     

A low-mass vacuum exit foil for high energy electrons and hadrons

The low-mass exit-foil system for the spectrometers in the electron-scattering facility at NIKHEF-K is described. It facilitates the achievement of high momentum resolution as well as the possibility to use the spectrometers for detection of not only protons but also deuterons, tritons, ³He and ⁴He. The system is constructed of very thin Kapton and Mylar foils reinforced with Kevlar material and features a differential pumping system.     

影响扬声器纸质振膜动态力学性能的因素

研究了不同定量、不同浆料打浆度对扬声器纸质振膜材料动态弹性模量和损耗因子的影响,并对复合纸质振膜的动态力学性能进行了研究.结果表明,随着纸张定量的增加,浆料打浆度的提高,纸张的紧度和动态弹性模量升高,损耗因子下降.纸质振膜的复合结构影响其动态力学性能,与原纸相比,干法复合导致复合纸紧度和损耗因子均升高,湿法复合使复合纸紧度降低而损耗因子升高,无论干法还是湿法复合后,复合纸的动态弹性模量变化均不明显.     

On the measurement of electrons in the 5–20 MeV range in liquids

Recent approaches to solve the solar neutrino problem comprise both new theoretical ideas and newly developed techniques for huge underground detectors. The investigation of electrons produced by neutrinos from the ⁸B decay is particularly interesting. Earlier bubble chamber photographs of electron tracks (5–20 MeV) in two liquids, the measurements of their energy and direction, may help to optimize the design of these detectors.     

Effects of geometry and position of the metal delivery tube on ultrasonic gas atomization

The effects of the geometry and the position of the metal delivery tube on the pressure condition in the gas-metal interaction zone were studied. The measurements were performed under conditions which simulated ultrasonic gas atomization experiments, but at low gas atomization pressures (50–200 psig, 345–1380 kPa). Low gas atomization pressures are used in spray atomization and deposition processes such as liquid dynamic compaction (LDC), and Osprey. Depending on the experimental conditions, either underpressure or overpressure in the metal delivery tube was detected. The magnitude of the underpressures and overpressures was found to increase with the gas atomization pressure; the maximum pressure differences with respect to the atomization tank pressure were about 3 psi (21 kPa) when argon was used as an atomization gas with a pressure of 200 psig (1380 kPa). Underpressure or overpressure effects of such magnitude have a large effect on the metal flow rate during gas atomization. The large pressure differences measured in the present work result from using an atomizer with gas jet diameters larger than those used in previous investigations. Using a large ultrasonic atomizer, argon gas flow rates of about 5 kg/min can be obtained for atomization pressures of 200 psig (1380 kPa).     

Synthesis of Na ion-electron mixed conductor Na3Zr2Si2PO12 by doping with transition metal elements (Co,Fe, Ni)

NASICON solid electrolyte Na₃Zr₂Si₂PO₁₂ (NZSP) exhibits high chemical stability and can be utilized as cladding materials of cathodes to improve battery cycle stability. However, the electronic conductivity of NZSP is extremely low (∼10⁻⁹ S cm⁻¹), which will hinder the electron conduction of cathode materials. To address this issue, the electronic conductivity of NZSP is improved by doping with transition metal elements (Co, Fe, Ni). Co-doped NZSP has an electronic conductivity of 5.03 × 10⁻⁶ S cm⁻¹. On the other hand, the ionic conductivity of doped samples remains stable, even slightly increased. The mechanical properties of pristine and doped samples are characterized with a micro indenter, which is also a key parameter for coating materials.     

小波变换和模糊模式识别技术在金属超声检测缺陷分类中的应用

基于金属超声检测中的缺陷脉冲回波为非稳态信号的特点,提出了一种缺陷定性特征值的提取是模式识别的关键,因此提出用小波变换提取特征值,多面手用模式识别的方法对小波变换的特征值提取结果进行定性分类,从而确定缺陷类型。采用上述上种不同性质的缺陷进行分析和处理。结果表明,用小流变换提取特征值的方法是有效的,而模糊模式识别算法也得到了较好的分类效果。     

一种以多晶硅为振动膜的MEMS传声器研制

给出了以磷掺杂的多晶硅为振动膜的电容式MEMS传声器的研制过程。从等效电路模型出发,研究了电容式MEMS传声器的振动特性和灵敏度,给出了传声器灵敏度随振动膜张力、膜与背板间的空气隙厚度、背板声孔大小及背板声孔所占面积而变化的解析表达式。结合硼掺杂硅/硅复合背板结构MEMS传声器,提供了参考制作工艺流程。样品测试在1kHz频率处的灵敏度达到-60dB(相对于1V/Pa)。