变电站SF6泄漏检测与智能机器人应用结合

以往通过人工方式完成变电站设备SF6气体的检测工作居多,但SF6气体泄漏浓度过高时,会给巡检人员的身体健康造成一定的威胁,严重时还会导致死亡。基于此,考虑以机器人为载体,搭载SF6检测传感器,完成对变电站SF6气体泄漏检测,并在最后的检测结果中,明确了智能机器人搭载SF6检测的可行性。     

微量浓度二元混合气体的超声检测研究

理论推导了使用参比法的超声检测二元混合气体的微量气体浓度的计算公式.基于超声传播在不同浓度的混合气体中具有微小时差的特性,设计了微量气体浓度检测系统.利用该系统对空气中六氟化硫(SF6)气体浓度进行了实验验证,验证结果与理论计算吻合,对空气中的六氟化硫来讲,检测的分辨率优于30×10-6(V/V).     

在线式SF6微水含量传感器

研制了一种在线式SF6气体微水含量检测传感器.该传感器采用露点测量法能够准确测试气体的微量水分,并且可安装在罐体上,实时在线检测.这样,就可以通过计算机等显示装置,随时检测SF6气体的微量水分值,对高压开关运行起到很好的保障作用.     

基于HYT271的SF6微水密度分析系统

为了保障SF6气体绝缘设备的绝缘特性和灭弧能力,设计了一种基于HYT271的SF6微水密度分析系统。系统通过温湿度一体传感器HYT271和压力传感器MS5803分别检测出所处SF6气室中的温度值、相对湿度值和绝对压力值,并通过微控制器对测量数据进行校准和计算,最后采用RS485总线将测量和分析的数据发送给上位机。实验结果表明,系统具有良好的精度,功耗低,实时性强且设计简洁,方便了对高压电气设备中SF6的分析与监测。     

基于GWO-BP神经网络补偿的SF6红外气体传感器

为实现电力系统中SF 6气体的有效监测与控制,本文基于非色散红外原理(NDIR),设计了一种SF 6气体传感器。但是,在实际的测量中,环境的温度与气压差异性容易影响SF 6气体浓度检测装置的检测精度,因此需要采取适当的方法消除环境引起的测量误差。本文采用灰狼智能优化算法—误差反向传播(GWO-BP)神经网络对环境温度与气压变化引起的测量误差进行了补偿,并与其他补偿方法作了比较。分析得出:进行补偿后的浓度数据在0~2000 ppm范围内误差为±15 ppm,满量程误差为0.75%FS,有效提升了传感器的测量精度与稳定性。相较于电路补偿法,该方法有更高的测量精度,并且降低了传感器的体积和成本。     

高压变电站室内SF_6浓度的红外激光吸收检测方法研究

为了实现高压变电站室内SF6气体浓度的精确实时检测,对红外激光吸收方法用于SF6检测进行了研究和分析.根据SF6气体在红外波段(10.55 μm)的强吸收特性,研究了在该波段下SF6吸收特性和其浓度之间的关系,并得出了二者之间的关系曲线.该方法为高压变电站室内SF6气体的定量检测提供了理论基础.     

SF6微水／密度在线式监测装置的研究

文章简述SF6气体绝缘设备中水分的来源,气体泄露原因分析及现有检测方法的缺陷;提出了SF6气体密度计算方法和微水20℃修正方法,阐述了以高分子薄膜电容式露点传感器,压力传感器和温度传感器作为组成元件的新型在线监测微水／密度装置的结构原理和应用系统的构架,并指出其现实意义。     

无线酒精气体传感器节点的设计与实现

针对酒精气体浓度检测以及如何将信号实时地传输到监测点等问题,结合智能传感器的设计思想,提出了一种基于无线通信技术的酒精气体传感器节点的设计方法.介绍了该酒精气体传感器节点的工作原理、设计方案,详细描述了系统的硬件设计、软件架构及实现方法.测试结果表明:该系统性能稳定可靠,实现了对酒精气体的实时监测.     

WSNs中基于节点能耗特征的入侵检测模型研究

为了解决无线传感器网络中的拒绝服务攻击问题,利用传感器节点能耗特征,提出了基于能耗特征的无线传感器网络入侵检测模型.采用能耗检测的方式,利用马尔科夫模型为节点建立能耗预测模型,并且对节点能耗变化进行相关性检测,综合判断节点行为是否存在异常.仿真结果表明,该模型对节点的入侵行为具有较好的检测效果.     

一种基于节点实时流量的异常检测算法

针对无线传感器节点缺乏移动性和可预知的流量模式等特征,从而难以在传感器网络中进行异常检测的问题,该文提出了一种基于节点的实时异常检测算法.根据节点流量的到达过程,提出了一种新的节点流量到达模型,根据多层次的滑动窗口事件存储原理,将动态统计值进行短时间的保持,对不同时间段的到达过程指标进行比较,包括节点的可计算资源,低复杂度,融合特性等,以此来判别流量到达过程是否发生异常,从而对传感器网络进行有效的异常检测.     

Technology innovation and process integrations for sub-100nm gate patterning

This paper presents a brief overview of the Applied Centura(R)DPS(R)system,configured with silicon etch DPS Ⅱ chamber, with emphasis on discussing tuning capability for CD uniformity control. It also presents the studies of etch process chemistry and film integration impact for an overall successful gate patterning development. Discussions will focus on resolutions to key issues, such as CD uniformity, line-edge roughness, and multilayer film etching integration.     

White organic light-emitting devices based on fac tris（2- phenylpyridine） iridium sensitized 5,6,11,12-tetraphenylnap -hthacene

We have fabricated the white organic light-emitting devices （WOLEDs） based on 4,4＇ -bis（2,2 -diphenyl vinyl）-1,1＇ - biphenyl （DPVBi） and phosphorescence sensitized 5,6,11,12,-tetraphenylnaphthacene （rubrene）. The device structure is ITO/2T-NATA （20 nm）/NPBX （20 nm）/CBP： x%Ir（ppy）3：0.5% rubrene （8 nm）/NPBX （5 nm）/DPVBi （30 nm）/Alq（30 nm）/LiF（0.5 nm）/A1. In the devices, DPVBi acts as a blue light-emitting layer, the rubrene is sensitized by a phosphorescent material, fac tris （2-phenylpyridine） iridium [Ir（ppy）3], acts as a yellow light-emitting layer, and N,N＇ -bis- （1-naphthyl）- N,N＇ -diphenyl -1, 1＇ -biphenyl-4,4＇ -diamine （NPBX） acts as a hole transporting and exciton blocker layer, respectively. When the concentration of Ir （PPY）3 is 6wt%, the maximum luminance is 24960 cd/m^2 at an applied voltage of 15 V, and the maximum luminous efficiency is 5.17 cd/A at an applied voltage of 8 V.     

Complete approach to automatic identification and subpixel center location for ellipse feature

To meet the need of automatic image features extraction with high precision in visual inspection, a complete approach to automatic identification and sub-pixel center location for similar-ellipse feature is proposed. In the method, the feature area is identified automatically based on the edge attribute, and the sub-pixel center location is accomplished with the leastsquare algorithm. It shows that the method is valid, practical, and has high precision by experiment. Meanwhile this method can meet the need of instrumentation of visual inspection because of easy realization and without man-machine interaction.     

小角度扩展相关性近似算法分析

本论文提出一种在多天线MIMO信道相关性建模中小角度扩展近似理论算法,并应用于分析MIMO系统性能。分析中分别对三种不同角能量分布情况下的空间相关性研发快速近似计算法,并同时提出双模(Bi-Modal)角能量分布情况下的近似运算。通过分析这些新方法的近似效率,可以得到计算简单、复杂度低、而且符合实际的MIMO相关信道矩阵,对系统级的快速高效计算法的研究和系统级的评估以及误差分析具有重要的意义。     

Curved crystal spectrometer for the measurement of X-ray lines from laser-produced plasmas

In order to diagnose the laser-produced plasmas, a focusing curved crystal spectrometer has been developed for measuring the X-ray lines radiated from a laser-produced plasmas. The design is based on the fact that the ray emitted from a source located at one focus of an ellipse will converge on the other focus by the reflection of the elliptical surface. The focal length and the eccentricity of the ellipse are 1350 mm and 0.9586, respectively. The spectrometer can be used to measure the X- ray lines in the wavelength range of 0.2-0.37 nm, and a LiF crystal （200） （2d = 0.4027 nm） is used as dispersive element covering Bragg angle from 30° to 67.5°. The spectrometer was tested on Shengnang- Ⅱ which can deliver laser energy of 60-80 J/pulse and the laser wavelength is 0.35 μm. Photographs of spectra including the 1 s2p ^1P1-1s^2 ^1S0 resonance line（w）, the 1s2p ^3P2-1s^2 1S0 magnetic quadrupole line（x）, the 1s2p ^3P1-1 s^2 ^1S0 intercombination lines（y）, the 1 s2p ^3S~1-1 s^2 ^1S0 forbidden line（z） in helium-like Ti Ⅹ Ⅺ and the 1 s2s2p ^2P3/2-1 s622s ^2S1/2 line（q） in lithium-like Ti Ⅹ Ⅹhave been recorded with a X-ray CCD camera. The experimental result shows that the wavelength resolution（λ/△ 2） is above 1000 and the elliptical crystal spectrometer is suitable for X-ray spectroscopy.     

Preparation and Characterization of TaN ALD Precursors

High purity organic-tantalum precursors for thin film ALD TaN were synthesized and characterized.Vapor pressure and thermal stability of these precursors were studied.From the vapor pressure analysis,it was found that TBTEMT has a higher vapor pressure than any other published liquid TaN precursor,including TBTDET,TAITMATA,and IPTDET.Thermal stability of the alkyl groups on the precursors was investigated using a 1H NMR technique.The results indicated that the tertbutylimino group is the most stable group on TBTDET and TBTEMT as compared to the dialkylamido groups.Thermal stability of TaN precursors decreased in the following order:TBTDET ＞ PDMAT ＞ TBTEMT.In conclusion,precursor vapor pressure and thermal stability were tuned by making slight variations in the ligand sphere around the metal center.     

A Versatile Mixed-Signal Pin Approach for Cost-Effective Test of Automotive ICs

Integrated circuits (ICs) intended for increasingly sophisticated automotive applications bring unique test demands. Advanced ICs for applications such as highly integrated automatic braking system (ABS) and airbag controllers combine high voltage digital channels, significant VI demands and precise timing capability. Along with continued missioncritical reliability concerns, the trend toward higher voltage operation and increased device integration requires specialized test capabilities able to extend across the wide operating ranges found in automotive applications. Among these capabilities, automotive test requirements increasingly dictate a need for a cost-effective versatile mixed-signal pin electronics with very high data rates reaching up to 50MHz with a voltage swing of-2 V to +28 V.     

Electronic Structure of Semiconductor Nanocrystals

This paper reviews our recent development of the use of the large-scale pseudopotential method to calculate the electronic structure of semiconductor nanocrystals, such as quantum dots and wires, which often contain tens of thousands of atoms. The calculated size-dependent exciton energies and absorption spectra of quantum dots and wires are in good agreement with experiments. We show that the electronic structure of a nanocrystal can be tuned not only by its size,but also by its shape. Finally,we show that defect properties in quantum dots can be significantly different from those in bulk semiconductors.     

Critical Stage Rule-Based Real Time Dispatch（RTD）System in Highly-Mixed-Products （HMP） FAB

An improving utilization and efficiency of critical equipments in semiconductor wafer fabrication facilities are concerned. Semiconductor manufacturing FAB is one of the most complicated and cost sensitive environments. A good dispatching tool will make big difference in equipment utilization and FAB output as a whole. The equipment in this paper is In-Line DUV Scanner. There are many factors impacting utilization and output on this equipment group. In HMP environment one of the issues is changing of reticule in this area and idle counts due to load unbalance between equipments. Here we'll introduce a rule-based RTD system which aiming at decreasing the number of recipe change and idle counts among a group of scanner equipment in a high-mixed-products FAB.     

Optical vibration and deviation measurement of rotating machine parts

It is of interest to get appropriate information about the dynamic behaviour of rotating machinery parts in service. This paper presents an approach of optical vibration and deviation measurement of such parts. Essential of this method is an image derotator combined with a high speed camera or a laser doppler vibrometer （LDV）.