银-铜-铁-镍体系测定条件的旋转设计优化和目标转换因子分析法的同时测定

利用二次通用旋转组合设计的方法 ,建立了吸光度与显色剂、增敏剂用量以及p H值之间的数学模型 ,进而得到使吸光度最大的显色剂用量、增敏剂用量及 p H值。在此优化的基础上 ,用目标转换因子分析分光光度法对银、铜、铁、镍的合成样品的合谱进行了解析处理 ,得到较为满意的结果。     

电子束与等离子体相互作用中的反常效应

本文对强流相对论性电子束与靶等离子体相互作用的反常吸收效应进行了理论研究。从符拉索夫方程出发,导出了强流相对论性电子束双流不稳定性效应解,并进行了弱碰撞修正,得到了相应的等离子体波增长率,对不同情况下出现反常效应的条件及机制进行了研究和讨论。     

On the Distance Between Some πps Sampling Designs

Asymptotic distances between probability distributions appearing in πps sampling theory are studied. The distributions are Poisson, Conditional Poisson (CP), Sampford, Pareto, Adjusted CP and Adjusted Pareto sampling. We start with the Kullback-Leibler divergence and the Hellinger distance and derive a simpler distance measure using a Taylor expansion of order two. This measure is evaluated first theoretically and then numerically, using small populations. The numerical examples are also illustrated using a multidimensional scaling technique called principal coordinate analysis (PCO). It turns out that Adjusted CP, Sampford, and adjusted Pareto are quite close to each other. Pareto is a bit further away from these, then comes CP and finally Poisson which is rather far from all the others.      

目标拦截的导引方法与仿真模拟

本文对目标拦截的导引方法进行了研究和模拟，是项目“军事指挥实时动态真实感模拟系统ＲＤＭＳＳ”的目标拦截模拟部分，主要内容是：对导弹的导引弹道进行了分析和模拟，并提出用样条预测的新方法进行目标导引；给出了模拟爆炸和火焰喷射的简易方法；最后在ＳＧＩ／Ｉｎｄｉｇｏ２上实现了一个简单的仿真模拟系统，对飞机的飞行、导弹及反导弹的发射和拦截过程作了成功的模拟，取得了良好的效果．     

Field Performance Prediction Method Based On Contrast Metric Of Target Sub Regions

The field performance prediction of infrared imaging system is an important subject in infrared imaging field. In this paper, a novel method for predicting TA (target acquisition) performance is proposed, which combines the TOD (triangle orientation discrimination) threshold curve with an improved contrast metric based on the temperature in target sub regions. Specifically, the target is first subdivided into some sub regions with different target/background differential temperatures according to its thermal structure distribution. The number of equivalent triangle patterns across each sub region is calculated utilizing its effective size, the apparent temperature difference line, and the TOD curve. Further, the total number of equivalent triangle patterns over the integral target is achieved. Combining the TOD criteria, the target acquisition ranges for different discrimination (detection, recognition, and identification) levels are obtained by solving a set of equations. Comparisons with the preliminary experimental results show that this new TA approach can provide reasonable prediction of field performance. Foundation Item: The project supported by National Natural Science Foundation of China (No: 60477038).     

低对比度目标自动识别技术研究

提出了在实时光电混合联合变换相关器中应用拉普拉斯锐化技术.通过对联合变换功率谱面的锐化处理,提高了联合变换功率谱的杨氏条纹对比度,使得相关峰的对比度明显增强,从而提高了目标识别率.实验证明：利用该技术所能探测的目标对比度最低限度约为0.5%.作为实例,给出复杂背景下低对比度(0.8%)地面目标汽车的实验结果.     

KLY—1低能宽束离子源的研制

本文简介了KLY-1低能宽束离子源的结构,给出了物理设计的主要公式和调试实验的结果。对于氩离子束,在离子能量为4keV,距引出电极24cm处的5cm直径的靶上,测得最大氩离子流为45mA,束流不均匀性优于±25％。     

非同步的多普勒水声跟踪定位原理

提出了一种新的水声跟踪定位方法,它仅测量目标非同步声信标到达各测量基元的接收信号和频率,来对目标声学跟踪定位,称之为非同步多普勒定位方法,本文介绍其原理,处和仿真结果。     

An improved,regioselective synthesis of the radiolabelling precursor for the translocator protein targeting positron emission tomography imaging radiotracer [F]GE-180

[¹⁸F]GE-180 has been demonstrated to be a promising new positron emission tomography radiotracer for targeting translocator protein. PET imaging of TSPO will enable measurement of neuroinflammation and microglia activity in vivo. The synthetic route used in the initial discovery of GE-180, whilst enabling the rapid evaluation of the structure–activity relationships (SAR) in this molecular class, was not high yielding and not suitable for scale-up. Here we present an optimised route towards GE-180 and the radiolabelling precursor of [¹⁸F]GE-180 with significantly improved yields due to a strategy which improves the regioselectivity of the key indole formation step of the synthesis.     

一种基于声散射特性的有鳔鱼特征获取方法

鱼分类技术在渔业资源评估中的重要性日益凸显,而分类中能够得到不同鱼种的本质声散射特征尤为重要。文章基于鱼的声散射特性,提出一种有鳔鱼种特征获取新方法。鱼的目标强度反映了鱼的本质声散射特征,其主要取决于鱼鳔的大小、形状及声波入射角度、频率,文章基于基尔霍夫模式模型和图像处理方法进行建模,不仅可对鱼体和鱼鳔进行更真实的近似,而且可以得到精确的目标强度仿真结果。通过图像识别方法,对鱼体及鱼鳔图像进行灰度变换、二值化、边缘识别、轮廓提取等处理,得到鱼体及鱼鳔边缘坐标,利用得到的信息进行建模,并给出了相应的计算机仿真结果。最后进行了水池试验,对仿真数据与试验数据进行了对比分析,并提取得到有鳔鱼的目标强度特征,为鱼分类特征获取提供了一条新的途径。