风机过滤单元(FFU)空气动力及能耗性能预测研究

将风机相似律应用于风机过滤单元(FFU),通过理论推导建立了适用于FFU的性能预测模型,可对FFU的任何转速或任意工况的空气动力性能与能耗性能进行预测,并通过FFU样品的实验室性能试验对预测结果进行验证。结果显示,在FFU常用的实际运行工况范围内,预测结果与试验结果基本一致,证明了相似律对FFU的适用性以及FFU性能预测模型的可靠性。利用该性能预测模型,在一定条件和范围内可以大幅减少FFU的性能试验工作,可广泛运用于FFU的性能评价、设备选型和运行调节过程,特别是指导优化FFU智能运行控制策略。     

基于LoRa技术的FFU群控系统

FFU(风机过滤机组)被广泛应用于洁净车间的空气净化。介绍了一种基于LoRa技术的FFU群控系统,包括FFU控制器、LoRa网关、FFU群控服务器。与现有的系统相比,本系统大大减少了现场施工以及维护的工作量。     

直流FFU在高等级洁净室应用中的优势

分析国内FFU的使用现状，探讨两种FFU（交流型和直流型）的运行成本。针对这些优缺点，推荐使用直流FFU。     

风机过滤单元生命周期能耗分析

利用生命周期评价（LCA）方法对目前广泛应用于洁净厂房的风机过滤单元（FFU）进行了生命周期能耗分析,得出了一台FFU的生命周期能耗的组成以及各部分能耗所占比重。并从节能的角度出发,分析在一定工况下FFU高效（超高效）过滤器最优的更换周期使节能效益最好。对于FFU的能耗性能参数的获得,采用了FFU实验室测试方法。     

浅析不同结构的FFU安装

分析国内FFU的结构形式,讨论不同形式FFU的安装。     

浅析FFU在电子洁净室的应用

重点阐述了FFU的特点及控制方式，并结合现代电子洁净室对空气洁净度等级的要求；分析了FFU应用在洁净室中的优势，并介绍了FFU在实际工程案例中的应用。     

基于数值仿真CFD技术的FFU效能研究

在电子工业洁净室中MAU+DCC+FFU的系统是一个比较常见的空调系统。FFU作为洁净气流循环的主要动力及过滤部分，其效能情况一直是制约洁净室发展的桎梏。将利用数值仿真CFD技术对FFU单元在洁净室运行中的效能情况进行研究，以找到洁净室FFU设计的优化方向。     

FFU在电子超净工程中应用

介绍FFU在超净工程中的优势,以实例讨论了超净工程中使用FFU如何最优化设计,简化系统,降低成本。     

基于嵌入式的FFU控制系统设计

针对大量使用空气净化设备的市场需求,开发一种FFU远程集中控制系统。该系统具有巡检、报警、通信、风速设定、电流检测、分组管理、液晶显示、FFU驱动等功能。对于大量FFU设备,FFU驱动采用低功耗的设计,具有调速范围广、稳定、可靠、节能等优点,而通信网络结构采用分布式星型与总线混合结构。该控制系统操作简单、安装方便、扩展性强,主要用于工厂车间、地铁通风等大型场所。     

典型风机过滤单元(FFu)性能分析与评价

风机过滤单元(Fan Filter Unit,简称FFU)是一种模块化的末端净化装置,以其结构紧凑、布置灵活等特点,在洁净室中被广泛应用。针对FFU不同工况下的性能进行测试,分析其能耗变化规律。研究表明,在变工况条件下可根据FFU能耗性能特征,调整群控策略,以实现节能运行。针对不同FFU样品的能耗性能的评价,应同时考虑初始能耗性能指数及使用过程中的能耗增长率两个因素,加以综合判断。在产品的选择以及运行策略的制定方面对于FFU的设计、制造及使用提出指导建议。     

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.     

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.     

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.     

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.     

Teleportation of an arbitrary unknown N-qubit entangled state under the controlling of M controllers

A new quantum protocol to teleport an arbitrary unknown N-qubit entangled state from a sender to a fixed receiver under M controllers(M < N) is proposed. The quantum resources required are M non-maximally entangled Greenberger-Home-Zeilinger (GHZ) state and N-M non-maximally entangled Einstein-Podolsky-Rosen (EPR) pairs. The sender performs N generalized Bell-state measurements on the 2N particles. Controllers take M single-particle measurement along x-axis, and the receiver needs to introduce one auxiliary two-level particle to extract quantum information probabilistically with the fidelity unit if controllers cooperate with it.     

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.     

Diode-end-pumped Nd:YVO4/LBO lasers with 4.2W continuous-wave output at 457 nm

A continuous-wave (CW) 457 nm blue laser operating at the power of 4.2 W is demonstrated by using a fiber coupled laser diode module pumped Nd: YVO4 and using LBO as the intra-cavity SHG crystal With the optimization of laser cavity and crystal parameters, the laser operates at a very high efficiency. When the pumping power is about 31 W, the output at 457nm reaches 4.2 W, and the optical to optical conversion efficiency is about 13.5% accordingly. The stability of the out putpower is better than 1.2% for 8 h continuously working.     

Call for Papers

正Wireless Body-area Networks The last decade has witnessed the convergence of three giant worlds:electronics,computer science and telecommunications.The next decade should follow this convergence in most of our activities with the generalization of sensor networks.In particular with the progress in medicine,people live longer and the aging of population will push the development of wireless personal networks