有机涂层耐蚀性快速测试仪

基于多重动电位扫描极化的原理，设计了一种便携式快速测评有机涂层/金属体系耐蚀性能测试仪。该仪器既可用于实验室内加速实验测试，又可用于实船和工业现场测

菜籽粕对异育银鲫免疫应答能力的影响

试验鱼以投喂饲料的不同和是否注射抗原共分为10组,即免疫组:A、B、C、D、E组,免疫对照组:a、b、c、de、组,饲料对照组:A、a组。饲料试验组B、C、D、E、bc、、d、e组。其中,饲料对照组以豆粕和鱼粉为基础蛋白源,饲料试验组分别以双低菜籽粕和普通菜籽粕等氮替代对照组中50%(B、b;D、d)和100%(C、c;E、e)的豆粕蛋白,测定异育银鲫血液白细胞和头肾吞噬细胞的吞噬活性、血清溶菌酶活性、血清补体(C3,C4)含量、血清凝集抗体效价及免疫保护率。结果表明:从免疫后21 d开始,饲料试验组E

Plasma-assisted ignition for a kerosene fueled scramjet at Mach 1.8

By using a plasma jet (PJ) torch with 1.5 kW input power as an igniter, successful ignition for liquid-kerosene fueled combustion experiment was conducted in a direct-connected supersonic test facility. The incoming flow has total temperature of 950 K and local Mach number of 1.8, corresponding to Mach 4 flight condition. In this study, several optical techniques, including high speed photography, high speed schlieren photography, and planar laser scattering (PLS) technique, were combined to study the ignition process, flame propagation, and mixing features of liquid kerosene fuel with air around the cavity. The effect of fuel injection position, injection pressure, and feedstock gas on ignition performance has been analyzed. The results indicate that local mixing is a critical factor for ignition. It is also shown that the PJ torch with N-2 + H-2 feedstock is superior to the PJ torch with N-2 feedstock for the ignition of liquid-kerosene fuel. These results are valuable for the future optimization of kerosene-fueled scramjet engine when using a PJ torch as an igniter

GIS's Application on the Establishment of Soil Series Database

以闽东南漳浦部分地区为研究样区 ,在原土系划分的基础上 ,阐述了 GIS在土壤基层分类中的应用 .以 GIS软件 PC Arc/ Info3.4、GIS Arcview3.1建立土壤基层分类的数据库 ,并借助此结果 ,进行土壤制图、基层分类单元的空间查询检索、面积自动量算 ,以及与样区土地利用现状图的空间叠置分析 .应用结果表明 ,GIS在土壤资源管理方面具有强大的功能This paper selected parts of areas in southeast of Fujian province as research zone and expounded the GIS' sapplication on low category of soil classification based upon the soil series identi- fied before. By GIS' s software of PC Arc/Info 3 .4& GISArcview 3 .1 ,the database of low category of soil classification was founded.Additionally,resorted by this results,the soil mapping had been done,the soil unitof low category of soil classification can be queried and retrieved,the soil unitsar- eas can be automatically measured and the spatial-overlay analysis on such database and the land- use-status map in research zone had been made. All of these embodied the powerful function of GIS on soil source management.国家自然科学基金重点项目 ( 4 98310 0 4

An Approach of Extracting the Percent of Impervious Surface and Its Application in Haizhu District of Guangzhou City

非渗透表面丰度即非渗透表面含量百分比,是水文学中不透水层与遥感领域混合像元分解概念相结合的产物。在城市区域,非渗透表面多指房屋、道路、停车场等建设用地区。本文基于广州市海珠区2000年ETM+数据,首次采用单窗算法反演的地表温度数据与植被-非渗透表面-土壤(V-I-S)模型、归一化线性混合光谱模型(NSMA)相结合的方法提取研究区非渗透表面丰度值,并对提取结果进行49个300m×300m有效样区的抽样检验。结果表明抽样值与真实值之间存在10.03%的均方根误差以及2.65%的系统误差,从而进一步验证了三模型结合使用提取非渗透表面丰度的可行性。

基于E0-1 Hyperion影像地物识别与分类不同方法的效果比较

以广州市大学城为研究区域裁剪出Hyperion影像,直接从影像提取地物端元,采用光谱角匹配、无约束和全约束的线性混合像元分解等3种方法进行地物识别与分类,分别生成地物分类图;选用Kappa系数和总精度两个参数,对比不同方法的地物识别效果.结果显示,分类图像的总精度均大于60%,Kappa系数在0.61—0.80,表明将高光谱影像用于地物识别与分类,可获得好的地物识别与分类结果.其中,光谱角匹配和全约束的线性混合分解法得到的两个参数明显更大.就地物类型而言,3种方法都对自然地物有较好的识别与分类效果,如林地和草地的用户精度高于80%,裸地和水体的值也高于50%.对人工地物的高反射率表面也有好的识别效果,用户精度达100%;对老建筑屋顶以及低反射率表面的识别效果不佳.尽管如此,光谱角匹配和全约束的线性混合像元分解法对于识别建筑屋顶的水泥混凝土表面表现出优势,用户精度大于71.4%

单相流动直接数值模拟在GPU上的实现

直接数值模拟(Direct Numerical Simulation,DNS)是最根本的计算流体力学(Computational Fluid Dynamics,CFD)方法。该方法无需引入任何简化和近似,但计算量非常可观。在传统的基于中央处理器(Central Processing Unit,CPU)的计算机上,仅能求解Reynolds数较低或几何边界比较简单的湍流问题。而90年代发展起来的图形处理器(Graphic Processing Unit,GPU)的计算能力现已远高于CPU,具有性价比和计算密度高、能耗低等优势。本文基于交错网格的SIMPLE算法,利用CUDA(Compute Uni..