基于莲花发电厂DDL开关的励磁系统改进

莲花发电厂的励磁系统原为南瑞生产的SJ-800型励磁调节器,由于其中的PSS(power system stabilization电力系统稳定器)单元不能满足一个导流洞;根据国标的要求,励磁系统应有两套功率柜并列运行,SJ-800的功率柜的电流不均问题突出,不能得到有效的解决.拟更换广州电科院生产的EXC9000系列微机励磁调节器.改进后的微机励磁调节器,将会有独立的PSS单元,并且采用智能均流系统,对两套功率柜进行智能均流.     

基于C8051F060的数据采集子站设计

介绍了一种基于C8051F060嵌入式MUC的高精度数据采集子站设计,给出了相应硬件设计和软件程序.该设计以C8051F060 MUC为控制核心,仅用单片机内部集成的16位ADC对-10v～+10V电压范围内的模拟量进行高精度采集,利用RS232串口或CAN总线将采集的数据传给上位控制计算机.实际应用表明,该设计具有采集速度快、精度高,运行稳定的优点.     

基于C8051F060的微型生化分析仪高速数据采集系统

介绍了一种基于C8051F060单片机的微型生化分析仪高速数据采集系统.系统在CPLD产生的时序逻辑驱动下,以C8051F060单片机为控制核心,利用单片机片内集成的16位分辨率的A/D对CCD视频信号进行精确数据采集.为了加快数据存储速度,采用了DMA存储技术,使采样频率提高到300 kHz,满足了微型生化分析仪对高速采样的需求.实践检验表明,系统具有测试速度快、精度高、运行稳定、抗干扰能力强和成本低等特点.     

基于ZIGBEE的压力传感器标定系统的研究

针对随钻测量系统中压力传感器需要标定的问题,本文采用C8051F060作为微处理器,配合ZIGBEE无线传榆模块及标准自动加压台,设计了一种对未知压力传感器进行智能标定的系统,经过室内试验和现场试验验证,这种压力标定系统具有易操作、稳定性好、精度高等特点,可以满足压力传感器标定要求。     

基于C8051F040的CAN总线智能节点设计

给出了基于C8051F040的智能节点硬件、软件设计方案.     

基于C8051F060单片机的CAN-USB的接口设计

本文提出了基于C8051F系列单片机的CAN总线与USB总线的接口设计方案,创新地采用了Silicon公司生产的C8051F060单片机作为主控芯片实现接口的数据传输。该芯片集成了CAN控制器,可以达到接口小型化,低成本的目的。本文给出了接口的系统结构,硬件设计电路和软件设计程序。在实际运用中,该接口模块工作稳定,能够较好地实现CAN总线与USB总线的数据传输。     

基于C8051F060的采集存储系统的设计

介绍一种基于C8051F060单片机和NANDFlash的数据采集存储系统．该系统可实现3路信号采样,每路采样率为5KS／s。通过异步串行通信接口实现数据传输。并详细说明系统的软件设计。     

基于C8051F060的采集存储系统的设计

介绍一种基于C8051F060单片机和NAND Flash的数据采集存储系统.该系统可实现3路信号采样,每路采样率为5 KS/s,通过异步串行通信接口实现数据传输.并详细说明系统的软件设计.     

混合信号单片机C8051F060的DMA接口及编程

C8051F060是Cygnal公司新推出的一款高集成度混合信号单片机,该单片机具有16位1Msps的高性能模数转换器接口和专用于快速传送ADC结果数据的直接存储器存取接口DMA,本文介绍了DMA的原理及使用方法.     

基于C8051F060单片机的多路数据采集系统设计

本数据采集系统采用C8051F060单片机内置的数模转换器,最多可对8路模拟量数据进行采集,进行模数转换后将通过串口向计算机传输。同时使用Visual Basic 程序语言进行上位机设计,接收单片机发送的数据,并进行波形还原,实现实时数据采集功能。     

Resolution Enhancement Technology:Integrated Process Solutions using OPC

DUV lithography, using the 248 nm wavelength, is a viable manufacturing option for devices with features at 130 nm and less. Given the low kl value of the lithography, integrated process development is a necessary method for achieving acceptable process latitude. The application of assist features for rule based OPC requires the simultaneous optimization of the mask, illumination optics and the resist.Described in this paper are the details involved in optimizing each of these aspects for line and space imaging.A reference pitch is first chosen to determine how the optics will be set. The ideal sigma setting is determined by a simple geometrically derived expression. The inner and outer machine settings are determined, in turn,with the simulation of a figure of merit. The maximum value of the response surface of this FOM occurs at the optimal sigma settings. Experimental confirmation of this is shown in the paper.Assist features are used to modify the aerial image of the more isolated images on the mask. The effect that the diffraction of the scattering bars (SBs) has on the image intensity distribution is explained. Rules for determining the size and placement of SBs are also given.Resist is optimized for use with off-axis illumination and assist features. A general explanation of the material' s effect is discussed along with the affect on the through-pitch bias. The paper culminates with the showing of the lithographic results from the fully optimized system.     

Cost-effective test solutions for smart card and other integrated flash applications

From its emergence in the late 1980s as a lower cost alternative to early EEPROM technologies, flash memory has evolved to higher densities and speedsand rapidly growing acceptance in mobile applications.In the process, flash memory devices have placed increased test requirements on manufacturers. Today, as flash device test grows in importance in China, manufacturers face growing pressure for reduced cost-oftest, increased throughput and greater return on investment for test equipment. At the same time, the move to integrated flash packages for contactless smart card applications adds a significant further challenge to manufacturers seeking rapid, low-cost test.     

An improved parallel thinning algorithm with two subiterations

The parallel thinning algorithm with two subiterations is improved in this paper. By analyzing the notions of connected components and passes, a conclusion is drawn that the number of passes and the number of eight-connected components are equal. Then the expression of the number of eight-connected components is obtained which replaces the old one in the algorithm. And a reserving condition is proposed by experiments, which alleviates the excess deletion where a diagonal line and a beeline intersect. The experimental results demonstrate that the thinned curve is almost located in the middle of the original curve connectivelv with single pixel width and the processing speed is high.     

Theoretical analysis of the relationship between the Brillouin gain coefficient and the strain in the optical-fiber sensors

The relation between the power of the Brillouin signal and the strain is one of the bases of the distributed fiber sensors of temperature and strain. The coefficient of the Bfillouin gain can be changed by the temperature and the strain that will affect the power of the Brillouin scattering. The relation between the change of the Brillouin gain coefficient and the strain is thought to be linear by many researchers. However, it is not always linear based on the theoretical analysis and numerical simulation. Therefore, errors will be caused if the relation between the change of the Brillouin gain coefficient and the strain is regarded as to be linear approximately for measuring the temperature and the strain. For this reason, the influence of the parameters on the Brillouin gain coefficient is proposed through theoretical analysis and numerical simulation.     

Novel fiber-optical interferometer with miniaturized probe for in-hole measurements

Today, micro-system technology and the development of new MEMS （Micro-Electro-Mechanical Systems） are emerging rapidly. In order for this development to become a success in the long run, measurement systems have to ensure product quality. Most often, MEMS have to be tested by means of functionality or destructive tests. One reason for this is that there are no suitable systems or sensing probes available which can be used for the measurement of quasi inaccessible features like small holes or cavities. We present a measurement system that could be used for these kinds of measurements. The system combines a fiber optical, miniaturized sensing probe with low-coherence interferometry, so that absolute distance measurements with nanometer accuracy are possible.     

Study of waveguide coupling efficiency in hybrid silicon lasers

This paper presents a new method to increase the waveguide coupling efficiency in hybrid silicon lasers. We find that the propagation constant of the InGaAsP emitting layer can be equal to that of the Si resonant layer through improving the design size of the InP waveguide. The coupling power achieves 42% of the total power in the hybrid lasers when the thickness of the bonding layer is 100 nm. Our result is very close to 50% of the total power reported by Intel when the thickness of the thin bonding layer is less than 5 nm. Therefore, our invariable coupling power technique is simpler than Intel＇s.     

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 rigorous proof of MIMO channel capacity’s increase with antenna number

It is well known that adding more antennas at the transmitter or at the receiver may offer larger channel capacity in the multiple-input multiple-output（MIMO） communication systems. In this letter, a simple proof is presented for the fact that the channel capacity increases with an increase in the number of receiving antennas. The proof is based on the famous capacity formula of Foschini and Gans with matrix theory.     

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.