巡飞攻击导弹红外成像导引头随机振动响应分析

以巡飞攻击导弹红外成像导引头为研究对象,依据弹性力学基本原理,对系统结构模态及随机振动响应进行了理论分析并求解。建立了导引头有限元分析模型,利用ANSYS Workbench有限元分析软件,对导引头进行了模态分析、随机振动响应分析,计算出了导引头前六阶固有频率及振型,并在此基础上对导引头进行了随机振动响应分析,在探测器和电子舱结构中各取一节点作为检测点,分析2点在给定随机激励下的加速度响应,并对导引头进行了应力分析。计算结果表明,导引头固有频率设计合理,加速度响应能满足使用要求。     

巡飞攻击导弹红外成像导引头减振技术研究

以巡飞攻击导弹红外成像导引头为研究对象,综合考虑冲击、振动两种主要的力学环境,以减振器静弹性模量为变量,根据冲击、振动环境设计要求确定约束条件,结合弹体提供给导引头的空间尺寸,设计适合本导引头的橡胶减振器。利用ANSYS Workbench有限元分析软件,通过计算导引头在带减振情况下的固有频率及探测器加速度响应的均方根值,对减振器进行减振效果分析,并根据计算结果对减振器参数进行调整。设计出了一种既具有缓冲效果又具有隔振效果的橡胶减振器,使导引头能满足弹体的动力学环境要求,为今后类似结构的缓冲、减振设计提供借鉴。     

整流罩加热对红外电荷耦合器件导弹导引头补偿和增益校正的影响

研究了整流罩加热对红外电荷耦合器件导弹导引头的影响;对两种材料,计算了其在发射后作为时间函数的背景辐射及器件存储阱产生的电荷,并且还讨论了为在飞行过程中保持导引头最佳灵敏度所需的信号处理问题。     

三点源诱骗抗反辐射导弹合成场计算与仿真

为了解决反辐射导弹在三点源诱骗及多点源诱骗情况下被动雷达导引头处合成场的计算,分析了多点源诱骗系统抗反辐射导弹的条件,对三点源诱骗抗反辐射导弹合成场强和相位进行了推导计算,最后采用Matlab对导弹实时飞行过程中导引头处的合成场的幅度和相位进行了仿真分析,仿真结果验证了模型的有效性。     

火箭弹红外成像导引头位标器的机械结构可靠性分析

以一种火箭弹红外成像导引头位标器为研究对象,利用ANSYS建立了位标器的有限元分析模型并分析了位标器机械结构部分的可靠性,首先模拟了导引头位标器在极限温度下-10℃和50℃的热力分析,然后对位标器进行了模态分析并得到了几种固有频率,最后根据位标器的冲击要求进行了冲击响应分析,计算结果表明导引头的机械结构的可靠性满足精度要求。     

目标散布区对导弹导引头抗干扰能力的影响分析

 远程智能化反舰导弹在其飞行末端可对一个区域内的目标进行搜索攻击,但不同大小和形状的目标散布区对导引头抗干扰能力的影响也不同.分析了导弹攻击过程中可能遭受的电子干扰,指出目标散布区将影响导弹雷达的开机时间,并给出目标散布区对导弹导引头抗电子干扰能力影响的计算模型.针对电子干扰下的反舰导弹作战进行了仿真计算,结果表明该模型较好地评价了导弹抗干扰能力下降对作战效能的影响.     

空空导弹目标截获概率研究

为提高中、末制导交接班时导引头对目标的截获能力,对空空导弹采用高精度惯性/卫星组合导航系统时导引头的指向误差及其对目标截获性能的影响进行了研究。首先,对中、末制导交接班时雷达导引头的速度截获概率进行了分析;其次,分别建立了雷达测量误差、初始对准误差和惯性元器件误差与导弹位置、姿态测量误差和目标位置测量误差的关系,并得到了其误差影响的方差表达式;然后,对比分析了导弹位置、姿态测量误差和目标位置测量误差造成的导引头指向误差随导弹发射距离的变化;最后,通过蒙特卡罗仿真分析了捷联惯性导航系统和惯性/卫星组合导航系统对导引头截获概率的影响。结果表明:对于远程空空导弹,导弹位置测量误差是影响导引头截获概率最重要的因素;采用惯性/卫星组合导航系统可以减小导弹的位置测量误差,并将导引头截获概率的95%置信区间由(0.715 6,0.811 0)提高到(0.880 2,0.943 1)。     

被动微波红外双模复合制导交班误差分析

针对舰空导弹采用双模复合制导导引头的特点,介绍了旋转式相位干涉仪的测角原理和红外玫瑰扫描跟踪目标的实现方法;在分析舰空导弹交班流程的基础上,对被动微波/红外制导交班误差进行了分类和计算,分析求解出导弹交班总误差;通过实例仿真,讨论了各误差源对交班误差的影响。仿真结果可为舰空导弹复合制导交班及导引头设计提供参考。     

红外诱饵弹对抗四元红外导引头方法研究

介绍了红外制导导弹发展趋势和四元红外导引头的工作原理，分析了其目标定位方法、抗干扰原理及传统红外诱饵弹干扰方式失败原因．通过对红外诱饵脱离导弹视场时间进行理论计算，提出了增加投放红外诱饵弹数量、缩短投放间隔干扰四元红外导引头的新方法．     

反装甲导弹雷达导引头制导性能分析

分析了雷达导引头用于反装甲导弹的技术方案.在目标的特性分析基础上,论证了导引头适宜采用的信号类型及具体的高分辨信号形式,设计了导引头在地面段和空中段的工作模式及工作过程.采用一组工作参数仿真分析了导引头达到的测量精度,结果表明,雷达导引头的测距精度小于1 m,角速率误差小于0.2°/s,随弹目距离的减小,精度进一步提高.导引头具备较高的制导性能和技术可实现性,对反装甲导弹雷达导引头的工程应用具有一定参考价值.     

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.     

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.     

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.     

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.     

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.     

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.