从欧洲水下防务展看鱼雷发展趋势

通过对最近几年欧洲水下防务展鱼雷技术的变化分析，总结了当代鱼雷的发展趋势。在研发思路上，西方鱼雷研制大国更加务实，走系列化发展道路，按照符合效费比的原则逐步改进鱼雷的性能，采用“制造-试验-制造”的方法，确保鱼雷武器在实战环境下的可靠、有效。在鱼雷设计上，目前主要改进领域集中在制导、推进、隐身、浅水等几个方面，并追求可靠性、保障性和低成本。其中，制导多采用标准总线和一体化设计，在开放式系统中采用COTS电子组件，具有较好的扩展性能，可快速进行软件升级和硬件改进，及时提高战术性能。实践证明，该研发思路符合需求，效果显著，能以最少的花费得到最出色的总体性能提升。     

基于色键抠像技术的电视跟踪系统仿真方法研究

在仿真训练中，某型武器的电视跟踪系统的仿真采用了色键抠像技术来实现。色键抠像技术是电视节目制作领域产生节目画面的一种较为成熟的技巧，它通过高低电平的变换将两幅画面合二为一。通过分析装备的实际特点，使用色键抠像技术将电视跟踪系统的摄像机拍摄采集到的真实场景与计算机生成的虚拟空袭目标相融合，并最终在电视跟踪系统的监视器上显示，从而为反空袭一方的作战训练提供“看得见”的靶标，使训练更加贴近真实。     

Modeling and Performance Prediction of Induction Motor Drive System for Electric Drive Tracked Vehicles

The principle of rotor flux-orientation vector control on 100/150 kW three-phase AC induction motor for electric drive tracked vehicles is analyzed, and the mathematic model is deduced. The drive system of induction motor is modeled and simulated by Matlab/Simulink. The characteristics of motor and drive system are analyzed and evaluated by practical bench test. The simulation and bench test results show that the model is valid, and the driving control system has constant torque under rated speed, constant torque above rated speed, widely variable speed range and better dynamic characteris- tics. In order to evaluate the practical applications of high power induction motor driving system in electric drive tracked vehicles, a collaborative simulation based on interface technology of Matlab/Simulink and multi-body dynamic analysis software known as RecurDyn is done, the vehicle performances are predicted in the acceleration time （0 - 32 km/h） and turning characteristic （v = 10 km/h, R = B）.     

Infrared Image Small Target Detection Based on Bi-orthogonal Wavelet and Morphology

An image multi-scale edge detection method based on anti-symmetrical bi-orthogonal wavelet is given in theory. Convolution operation property and function as a differential operator are analyzed,which anti-symmetrical bi-orthogonal wavelet transform have. An algorithm for wavelet reconstruction in which multi-scale edge can be detected is put forward. Based on it, a detection method for small target in infrared image with sea or sky background based on the anti-symmetrical bi-orthogonal wavelet and morphology is proposed. The small target detection is considered as a process in which structural background is removed, correlative background is suppressed, and noise is restrained. In this approach, the multi-scale edge is extracted by means of the anti-symmetrical bi-orthogonal wavelet decomposition. Then, module maximum chains formed by complicated background of clouds, sea wave and sea-sky-line are removed, and the image background becomes smoother. Finally, the morphology based edge detection method is used to get small target and restrain undulate background and noise. Experiment results show that the approach can suppress clutter background and detect the small target effectively.     

基于模糊神经网络的目标识别模型

目标识别是地空导弹武器系统决策中的关键技术．针对目标特性，提出了一种基于模糊技术的BP神经网络的目标识别模型．从传感器中提取目标特性，经过模型处理，可以较好地实现目标的类型识别．     

国外某铅、锑复杂矿石中金的提取预富集试验研究

国外某铅、锑复杂矿石中主要金属矿物为脆硫锑铅矿及黄铁矿,矿石中的伴生金主要赋存于脆硫锑铅矿中,其次赋存于黄铁矿中。矿石锑品位1.50%,铅品位2.21%,金品位5.1 g/t,对矿石进行选矿提取预富集,有效地回收矿石中各有价金属。此外,对选矿预富集所得的产品的冶炼加工技术进行了探讨。     

水产品中重金属检测方法研究进展

重金属在水产品中浓集能力强,可多种途径进入体内,当人体摄入的重金属超过一定量时,将会对机体产生各种危害,因此受到越来越多的国内外学者的关注,水产品中重金属的含量逐渐成为限制水产品食用安全的重要因素之一,但水产品中富集的重金属含量比较低,对其快速准确地测定有一定的难度.该文主要综述了水产品中重金属检测技术及样品前处理方法...     

库尔勒香梨感官及理化指标的定量无损检测

目的 利用高光谱成像技术建立库尔勒香梨分级指标的快速检测方法.方法 选择采摘期香梨作为研究样本,以颜色(a*)、硬度(带皮硬度,hardness)和可溶性固形物(soluble solids content,SSC)为研究指标,使用高光谱成像系统采集样本900～1700 nm范围波长的漫反射光谱.提取样本感兴趣区域(r...     

近红外图像消噪方法的对比实验研究

为了选择一种既能消除近红外图像噪声又能达到保持其图像边缘要求的消噪方法,通过比较各种常见的图像去噪算法,采用信噪比(SNR)、均方根误差(RMSE)和图像灰度曲面图等作为图像去噪效果的评估.对实际拍摄的多幅近红外图像进行消噪效果对比,仿真实验结果表明:在综合考滤图像去噪平滑效果、图像清晰程度和时间复杂度的基础上,分形消噪法较优,可应用于近红外图像的消噪处理.     

阀控式铅酸蓄电池的维护与监测

文中就蓄电池人工检测与在线监测的技术加以比较,详细论述了各种检测方法的优缺点,提出蓄电池维护中以内阻在线监测为主的解决方案。