基于X波段雷达测距的吊车防撞高压线监测系统

本文采用x波段雷达测距技术实现施工周围的高压输电线进行测距,识别能力强,检测精度高。本系统还可将测量结果通过无线通信方式传至操作室进行数码显示。当进入危险距离范围内时,自动启动声光报警系统和视频监测系统,并将报警信息进行存储备查;同时系统向附近的安全监督员发送报警信息。可以有效地保证高压施工现场的安全。     

基于单片机的超声波汽车报警系统的设计

介绍了一种基于单片机与超声波结合的倒车报警系统的设计过程,本系统采用NE555和CX20106A构建超声波发射与接收电路,通过单片机与数码管实现测距计算与实时显示,同时用户还可以通过按键设置倒车报警距离,当达到设定的报警距离时系统将进行语音报警。另外系统设置了分段指示灯(倒车安全、注意倒车、倒车危险),提高了倒车安全系数。经测试,该系统在10～250 cm范围内能实现准确测距,且通过数码管实时显示倒车距离,并进行声光报警。本系统弥补了中、低端汽车报警系统不能实现准确测距和实时显示倒车距离的问题,具有集成度高、测量范围广、成本低等特点,能满足驾驶员在实际倒车中的需求,具有一定的理论和实用价值。     

基于超声波汽车倒车雷达预警系统设计

针对汽车倒车时的"后视"不良引起的倒车事故,介绍了一种基于超声波的倒车雷达预警系统.该系统在汽车挂倒挡时开始工作,通过超声波传感器发送超声波检测障碍物信息,经微处理器处理成测距信息,并进行显示,当距离小到设定的安全范围时,自动启动语音报警,该系统安装简单,抗震能力强,测距准确且工作稳定可靠.该文给出了系统各部分的硬件及软件实现,并分析了误差产生的原因.     

飞机场车辆防撞报警系统的设计与实现

文章讨论了一种利用超声波测距的机场特种车辆防撞报警系统 ,它是利用测距和语音的结合 ,以声、光等形式提醒司机刹车 ,达到保证安全的目的。     

智能汽车防追尾互通信系统的研究

为了防止高速公路追尾事故的发生,降低人身、财产损失,现主要依靠现代通信机制获得实时距离信息。具体方法是采用定位芯片CXD2951GA-2从卫星获得汽车运行位置与速度信息,再通过UART口传输到AT89S8252单片机系统,系统通过无线收发器Nrf905接收邻近车辆的速度信息,利用安全测距模型进行比较计算出安全距离,与两车实时距离进行比较以控制报警装置报警来防止事故的发生。经测试表明该无线互通信系统实时性强、性价比高,在交通运输、电子通信、信息处理领域有着广泛的应用价值。     

列车接近无线报警系统的设计与实现

列车接近无线报警系统自动采集列车接近信息,通过无线通信将采集到的报警信息传输到系统主机,实现了故障-安全原则,更有效的实现列车安全运行,可广泛应用于铁路道口、桥梁、隧道等地点,用来保证生命和财产安全。     

基于北斗的海上遇险报警管理系统设计与实现

基于北斗的海上遇险报警管理系统是将传统的海上安全信息播发、遇险报警与北斗导航和短报文等应用相结合,该系统的使用提高安全信息播发和遇险报警的时效性、准确性和针对性,能够在很大程度上弥补当前海上重大安全信息播发能力的不足、遇险报警发现不及时或无法有效发现的问题,是对现有海上遇险报警管理系统的有益补充,本文主要阐述该系统的主要功能和软硬件构成.     

超声波倒车防撞系统

利用ATMEL公司的AT89C51单片机接收超声波传感器的测距信号,根据超声波测距原理,将实时信号送给单片机,单片机实现距离的计算、显示、报警,当在探测范围内有障碍物时,并且障碍物的距离小于报警距离时,发光二极管以一定频率闪烁,同时蜂鸣器提示报警,并显示障碍物的距离。经验证,此系统实现了超声波倒车防撞系统各功能,且该系统实时性较稳定,误差距离比较小。     

基于物联网的“智能呼吸窗”系统

综合运用传感器技术、计算机控制技术和蓝牙通信传输技术设计了基于物联网的"智能呼吸窗"系统,系统包括光照控制电路、温度控制电路、烟雾控制电路、报警电路、超声波测距控制电路、电机控制模块、液晶显示模块和蓝牙通信模块以及GSM通讯模块。该系统通过检测室内的烟雾浓度、温度、声音、光照以及防盗测距等信息,控制窗户以及报警器,以满足人们的需求,方便人们的生活,同时在某种程度上也可保护人们的人身安全和财产安全,具有实用性、低成本、功能齐全、方便简洁等特点。     

汽车行车安全距离监测系统设计

本文设计的汽车行车安全距离监控系统主要是以STC89C52为主要核心,整合其他硬件设施,实现单片机通过超声波测距模块测得距离,将距离显示在屏幕上。用户可以通过按键设置安全距离阈值,一旦实测距离小于了预设阈值,那么系统就会驱动报警,提醒安全行车。这次设计是将高精尖技术生活化的一次尝试,在整个作品的设计、制作、调试过程中,对单片机又有了进一步的理解,对超声波测距、蜂鸣器等也有了更深入的了解。经过调试本系统具有较好的实用性,可以满足实际需求。     

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.     

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.     

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.     

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.     

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.