高体革鯻幼鱼肌肉营养成分分析

检测了高体革鯻(Scortum bacoo)幼鱼肌肉营养组成,结果表明:高体革鯻粗蛋白质量分数为17.77%,粗脂肪质量分数为3.42%,水解氨基酸总质量分数为15.71%,其中必需氨基酸质量分数为7.50%,占氨基酸总量的47.74%,鲜味氨基酸总质量分数为5.46%,占氨基酸总量的34.75%,必需氨基酸指数为88.60。说明高体革鯻具有较高的营养价值和养殖价值。     

Seismically induced slope instabilities and the corresponding treatments: the case of a road in the Wenchuan earthquake hit region

On May 12, 2008, a magnitude 8.0 earthquake hit Wenchuan County, Sichuan Province resulted in great loss of life and properties. Besides, abundant landslides and slope failures were triggered in the most seriously hit areas and caused disastrous damages to infrastructures and public facilities. Moreover, abundant unstable slopes caused by the quake have the potential to cause damages for a considerable long period of time. The variety of these slopes and the corresponding treatments are connected with the topographical and geological conditions of the sites. It is decided to document and identify some of these major slope instabilities caused by the earthquake and their treatments. The paper shows the condition of a road in Dujiangyan through in situ explorations. The case history showed significant implications to the reconstruction of the quake-hit regions and future disaster prevention and management works.     

黄海南部黄鲫(Setipinna taty)资源利用分析

以2005-2006年江苏省帆式张网渔获资料为基础,分析研究了黄海南部黄鲫资源的时空分布、群体组成结构以及产卵群体生物学特征.结果表明,黄海南部黄鲫主要利用渔期为春季3-5月、冬季1月或12月.春季高产渔区主要分布在大沙渔场的西南部和吕泗渔场的东部,冬季和秋季高产渔区相对靠近或较春季高产渔区偏东.黄鲫高产渔区的分布无明显季节变化特征.黄鲫渔获群体主要由体长70-110mm、体重0-15g的个体组成,产卵群体的平均体重范围为8.7-12.0g.与1981-2000年的研究结果相比,黄鲫个体小型化越趋显著,当前利用个体偏小.     

NUFFT-Based Iterative Reconstruction Algorithm for Synthetic Aperture Imaging Radiometers

Synthetic aperture imaging radiometers (SAIRs) are powerful sensors for high-resolution observation of the Earth at low microwave frequencies. However, the future application of this new technology is limited by its large number of element antennas and receiving channels. In order to further reduce the complexity of the whole system, the circular and rotating array configurations have been proposed. Their disadvantages lie primarily in more complicated image reconstruction, because the conventional fast Fourier transform (FFT) method could not be used directly for image reconstruction. This letter introduces an iterative method for the reconstruction of radiometric brightness temperature maps from nonuniform visibility function samples. This method combines the conjugate gradient algorithm with min-max nonuniform FFT approach, which has been shown to provide considerably improved image quality relative to the traditional gridding method. Simulations for SAIRs were performed and showed better image quality in comparison to the traditional frequency interpolation method.     

基于主成分分析的ENVISAT ASAR数据在福建省漳州市香蕉园地提取中的应用(英文)

Banana is one of the main economic agrotypes in Zhangzhou, Fujian Province. The multi-temporal ENVISAT ASAR data with different polarization are used to classify the banana fields in this paper. Principal component analysis (PCA) was applied for six pairs of ASAR dual-polarization data. For its large leaves, banana has high backscatter. So the value of banana fields is high and shows very bright in the 1st component, which makes it much easier for banana fields extraction. Dual-polarization data provide more information, and the VV and VH backscatter of banana show different characters with other land covers. Based on the analysis of the radar signature of banana fields and other land covers and the 1st component, banana fields are classified using object-oriented classifier. Compared to the field survey data and ASTER data, the accuracy of banana fields in the study area is 83.5%. It shows that the principal component analysis provides the useful information in SAR images analysis and makes the extraction of banana fields easier. Supported by the Program for New Century Excellent Talents in University (NCET-05-0573), Fujian Science and Technology Project (No.2006I0018), the Science Project of the Education Department of Fujian Province(No. 2006F5022).     

改进Frost算子在SAR图像斑点噪声抑制中的应用

针对合成孔径雷达(SAR)图像斑点噪声滤波的重要性以及存在的问题,对Frost滤波算法参数进行分析,指出了该算法等权滤波器在处理含有细节结构特征时存在盲目平滑的缺点,进而提出了改进方法。利用灰度差值计算权值,综合考虑滤波窗口内的强度信息,在一定程度上解决了盲目平滑的问题。实验验证了改进算法的有效性,并以斑点噪声指数和边缘保持指数为评价准则,通过与Frost算法比较,对改进算法在去除噪声和边缘保持方面的性能做了客观评价。     

大比例尺地形图数据建库格式的转换

介绍了将南方CASS软件编绘的1∶500数字化地形图(DWG格式)转换为符合测区数字测图DWG分层分色标准的数字化dwg格式图、转换为符合测区地形图要素分类编码规程和测区地形图数据结构规程的ESRI的SHP格式图、转换为符合测区地形图要素分类编码规程的Microsation V8的DGN格式图的三种格式转换的基本原理和技术路线.采用系统化编程方式批量进行转换,把大量的工作都凝聚在程序里,提高了效率,减免了数据转换过程中的信息损失,保证了质量,达到了入库要求.     

Numerical flow and performance analysis of a water-jet axial flow pump

The purpose of the present study is to investigate the performance and three-dimensional flow fields in a water-jet pump. TASCflow is employed to simulate the rotator-stator coupling flow field. A standard k-ε turbulence model combined with standard wall functions is used. In order to investigate the effect of a rear stator on flow fields, the flows in two water-jet pumps with and without a rear stator are studied. Computational fluid dynamics (CFD)-predicted overall performances are in good agreement with the experimental results. Then the flow fields, such as the pressure distribution on the blade surfaces, and the axial and tangential velocity distribution, especially the radial loading distribution, are investigated at different flow rates. In addition, the effects of a rear stator and different spacings between the rotor and the stator on the overall performance and the flow fields of the water-jet pump are also investigated.     

武汉市城乡规划动态监管信息系统的设计与开发

介绍了武汉市城乡动态监管信息系统建设的基本思路和技术构架,分析了系统功能划分、数据库设计、网络与安全体系建设等问题,对遥感技术、GPS技术以及信息资源整合技术在项目建设中的应用进行了讨论。