反射式TDICCD光学遥感器波段选择

光谱波段是光学遥感器设计中需要考虑的一个重要指标。首先对探测海洋目标的反射式TDICCD光学遥感器需要选择的光谱波段进行分析,应用LOWTRAN 7软件对0.4μm～1.0μm波段的大气透过率进行了计算,同时对典型的海洋目标（如船体）、海水的光谱反射率及其对比度进行分析,最后对遥感器的入瞳辐射亮度和信噪比进行了估算。计算结果表明：遥感器光谱波段选择0.5μm～0.9μm波段,在入瞳辐射亮度和信噪比等方面优于选择0.5μm～0.8μm波段。这一结论为实用系统的波段选择提供了依据。     

CCD摄像机TDI模式及实时显示技术研究

叙述了CCD摄像机作为微光夜视探测的TDI(时间延迟积分 )特性及实时显示多帧累积后目标图像的技术 ,利用CCD摄像机的外触发控制系统和EPLD可编程逻辑器件实现图像的TDI累积。可获得当CCD靶面照度为 3 7×10 -5lx下静态目标达到 3 0 0TVlines分辨率的图像。给出标准的视频信号输出及实时显示。     

气相色谱测定海绵文胸中甲苯二异氰酸酯残留

建立了气相色谱-内标法测定海绵文胸中的甲苯二异氰酸酯(TDI)残留量。样品经均质处理后,用经脱水处理的乙酸乙酯超声萃取25 min,过滤净化后,采用Agilent DB-624色谱柱(30 m×0.32 mm×1.8μm)分析,柱温采用程序升温,检测器为氢火焰离子化检测器,检测器温度为250℃,进样口温度为180℃,载气为氮气。结果表明:甲苯二异氰酸酯在10~200 mg/L范围内峰面积与质量浓度线性关系良好,线性相关系数(R~2)为0.998 9,平均回收率为80.5%~91.6%,RSD不大于7.9%(n=6),方法的检出限和定量限分别为10 mg/kg和100 mg/kg。在优化条件下,对生产企业、实体店和电商平台采购的100批次样品进行了检测。该方法操作简单、耗时短、灵敏度高、稳定性好,应用于日常检测可大大降低检测成本,缩短检测周期,具有实际应用价值。     

Pot life extension of hydroxyl terminated polybutadiene based solid propellant binder system by tailoring the binder polymer microstructure

A possibility of extending the pot life of the HTPB-TDI based propellant binder system without adverse modification of mechanical properties is explored in the present study. It is proposed that by tailoring functionality distribution of the base HTPB polymer and changing the binder composition concurrently, the pot life of the binder system can be extended while the mechanical characteristics are kept within the acceptability window. Using an existing empirical relationship between fraction of high molecular weight (Fh) in HTPB and r-value corresponding to a more optimized set of mechanical properties, the r-values were calculated for different HTPB resins. HTPB resins with widely varying fractions of high molecular weight (Fh) were chosen and binder networks were prepared at different r values. Viscosity build up and chemical kinetics were studied for different formulations. From the studies, it is shown that the extension of pot-life is achievable by about 150 minutes without sacrificing the mechanical characteristics.     

压剪炮的激光测速系统的研究

压剪炮试验是获取材料超高应变率下本构关系的最常用手段,其中普遍采用的测试方法是利用激光干涉技术同时测量靶板背面一点的纵向和横向速度。但传统的横向位移干涉仪抵抗靶板撞击过程中的运动而引起的光路偏移能力很有限,因而压剪试验成功率很低。本文讨论了撞击过程中靶板运动对横向位移干涉仪试验信号的影响,为提高横向位移干涉仪特别是非理想撞靶情况下的测量能力,对几种不同干涉光路进行详细分析。通过改进传统横向位移干涉光路,研制了一种新干涉光路,并通过试验证明:相对于传统光路,新光路更简单并更可靠。     

线阵TDI CCD遥感相机非均匀性校正的研究

线阵TDICCD遥感相机的非均匀性标定对获取高质量的图像来说具有重要意义。由于线阵TDICCD、透镜等主要部件的生产过程与工艺过程的控制和材料的种类及性质的影响,所以使所获取的图像是非均匀的,在图像上表现为水平纹理。分析了非均匀性校正的算法。根据线阵TDICCD相机像素光电响应不一致的特点,运用了两点定标的非均匀性校正的算法。最后对校正前后的图像的标准方差进行了比较,得到了令人满意的结果。     

Restoration of TDI camera images with motion distortion and blur

Platform movement during exposure of imaging system severely degrades image quality. In the case of Time delay and integration (TDI) camera, abnormal movements cause not only image blur but also distortion, for image Point Spread Function (PSF) is space-variant. In this paper, we present a motion degradation model of TDI image, and provide a method to restore such degraded image. While a TDI camera is imaging, it outputs images row by row (or line by line) along the scanning axis, and our method processes in the same track. We firstly calculate the space-invariant PSF of each row using the movement information of the TDI camera. Then, we substitute pixels of the row and the ones of their neighbor rows together with the PSF into standard Richardson–Lucy algorithm. By deconvoluting we get the restored pixels of the row. The same operations are executed for all rows of the degraded TDI image. Finally, a restored image can be reconstructed from those restored rows. Both simulated and experimental results prove the effectiveness of our method.     

具有随机隐单元的渐增前馈神经网络的$L^2(R^d)$逼近能力

This paper studies approximation capability to L2(Rd) functions of incremental constructive feedforward neural networks(FNN) with random hidden units.Two kinds of therelayered feedforward neural networks are considered:radial basis function(RBF) neural networks and translation and dilation invariant(TDI) neural networks.In comparison with conventional methods that existence approach is mainly used in approximation theories for neural networks,we follow a constructive approach to prove that one may simply randomly choose parameters of hidden units and then adjust the weights between the hidden units and the output unit to make the neural network approximate any function in L2(Rd) to any accuracy.Our result shows given any non-zero activation function g :R+→R and g(x Rd) ∈ L2(Rd) for RBF hidden units,or any non-zero activation function g(x) ∈ L2(Rd) for TDI hidden units,the incremental network function fn with randomly generated hidden units converges to any target function in L2(Rd) with probability one as the number of hidden units n→∞,if one only properly adjusts the weights between the hidden units and output unit.     

CURE CHARACTERISTICS OF HYDROXYL TERMINATED POLYBUTADIENE PREPOLYMER WITH BLOCKED TOLUENE DIISOCYANATE-Ⅰ

Controlled release of TDI and hence the cure characteristics of several blocked TDI with HTPB are reported. The reactions were followed through viscosity measurements as a function of time and temperature under the catalytic influence of triethylamine. The effect of nature of substituents present on the end capping substrate, temperature, solvent, basicity of catalyst and kinetics thereon have been studied.     

TENAX/吸附浓缩/热脱附/气相色谱法监测装药车间空气中的TDI

用Ｔｅｎａｘ／吸附浓缩／气相色谱法分析大气中的ＴＤＩ，得到了一个Ｔｅｎａｘ适宜的吸附流量和热脱附温度；每克Ｔｅｎａｘ吸附ＴＤＩ的最小量为０．４１ｇ；