海岛(礁)DEM成果的质量检查技术与方法

针对海岛(礁)DEM成果的特殊性和质量检验方法研究不足的现状,该文在分析传统方法的基础上,提出了一套适用于大批量海岛(礁)DEM成果质量检验的流程及技术方法:根据海岛(礁)DEM成果特征,分析了需要检验的质量元素,确定了不同质量元素的检验方法;进一步区分出可以采用程序自动检查的质量元素,并通过建立检查规则库,实现了部分检查项的批量自动检查;然后,研究其余质量检查项的实现方法,明确了内外业分工,完善了质量检查项的人机交互检查。最后,对3000余幅海岛(礁)DEM成果质量检验的结果表明:本文提出的技术路线可行,质量评价结果客观可靠。     

甘肃CGCS2000基础测绘成果转换方法研究

针对甘肃基础测绘成果数据类型多样、格式多样、存储方式多样、横跨六个三度带以及甘肃西部地区控制稀少和转换图幅多的特点,对数据成果和各种类型转换方法进行对比分析,形成了甘肃基础测绘成果转换的技术路线和实现方法,并成功地实现了甘肃省基础测绘成果的整体转换,该技术路线和方法对国家测绘地理信息局组织开展的全国CGCS2000基础测绘成果转换具有一定的借鉴意义。     

Numerical solution of the discontinuous-bottom Shallow-water Equations with hydrostatic pressure distribution at the step

Free-surface flows are usually modelled by means of the Shallow-water Equations: this system of hyperbolic equations exhibits a source term which is proportional to the product of the water depth by the bed slope, and which takes into account the effect of gravity onto fluid mass. Recently, much attention has been paid to the case in which bottom discontinuities are present in the physical domain to be represented: in this case, it is difficult to define the non-conservative product in the distributional sense. Here, the discontinuous-bottom Shallow-water Equations with hydrostatic pressure distribution at the bed step (Bernetti et al., 2006) are discussed in the context of the theory of Dal Maso et al. (1995) [9]; finally, a first-order numerical scheme is presented, which is consistent for regular solutions, and which is able to capture contact discontinuities at bottom steps. Numerous tests are presented to show the feasibility of the scheme and its ability to converge to the exact solution in the cases of smooth as well as discontinuous bed profiles.     

8.12桦南清晨局地突发短时冰雹过程分析

本文对2010年8月12日清晨桦南县发生的局地突发短时冰雹天气进行了天气成因分析,表明冷锋前强烈上升气流为冰雹云形成提供了动力条件,锋前新生对流云团发展形成冰雹云。利用雷达基本数据产品揭示了冰雹云形成发展、成熟和消散全过程的主要回波特征,并应用雷达产品对冰雹的识别及与人工识别进行对比,其产品比人工提前10分钟识别冰雹,具有很高的临近冰雹预警应用性能。     

武汉市冬季大雪分析预报

使用常规气象观测资料和数值预报产品,分析了1951-2005年冬季发生在武汉市的大雪过程,结果表明:武汉市冬季出现积雪深度大于5 cm的天气事件的概率大约为每年2 d,主要发生在1月,其次是2月;大气层结条件是产生降雪的关键,地面冷空气、中低层江南西南急流和中层西风带低槽是决定武汉市冬季大雪的3个主要天气系统,中低层江...     

基于四分图模型的温泉游客满意度测评及其应用研究——以聚龙湾天然温泉旅游度假村为例

首次将四分图模型应用于旅游度假游客满意度评价领域,构建温泉旅游度假游客满意度测评体系,并基于聚龙湾天然温泉旅游度假村的游客调研,确定各满意度因素的重要度和满意度,据此构造相应的四分图,充分展示该地游客满意度系列优势因素、改进因素、机会因素和维持因素.深入分析发现,不同特征的游客对温泉度假产品的满意度存在差异;温泉游客对...     

IGS 电离层 VTEC 产品内插算法解析

IGS电离层V T EC产品对电离层相关研究具有重要应用价值,其全球用户呈不断快速增长趋势。由于缺乏较详细的内插算法介绍,结合IO N EX1．0格式说明文件和瑞士BERN大学源代码对内插算法进行了解析,并以2013年5月16日产品为例说明了四种内插算法的差异,为准确使用IGS电离层V T EC产品提供了参考。     

省级基础测绘1：1万比例尺数字测绘产品的质量检验

省级基础测绘1：1万比例尺数字测绘产品包括DEM，DOM，DLG，DRG、元数据、文档簿等。为验证数字测绘产品最终成果的精度和可靠性，可选择多种方案进行质量检验；在选择检验方案时，既要考虑检验的成本、周期，又要考虑检验方案的科学性和严密性。针对不同的数字测绘产品，该文给出了与之相适应的检验方法，并阐明了检验内容和注意事项。     

Matlab在求解产品合格率中的应用研究

介绍了几种应用Matlab求解产品合格品率的有效方法．并进行了分析比较。找出了编程容易、精度较高、速度较快的求解方法,Matlab是一种功能强大的工程计算软件．在科研、统计等工程领域有着广泛的应用。     

Properties of proteolytic toxin of Vibrio anguilolarum from diseased flounder

Extracellular products (ECP) produced byVibrio anguillarum strain M3 originally isolated from diseased flounder (Paralichthys olivaceus) were prepared. ECP of M3 showed gelatinase, casinase, amylase and haemolytic activity on agarose plates. High protease activity against azocasin was detected. Bacterium M2 showed highest growth and protease activity at 25°C. The protease present in ECP showed maximal activity at pH 8 and 55°C; was completely inactivated by application of 80°C heat for 30 min; was completely inhibited by EDTA and HgCl₂, and was partially inhibited by PMSF, SDS, MnCl₂ and iodoacetic acid; but not inhibited by CaCl₂ and MgCl₂. The ECP was toxic to flounder fish at LD₅₀ values of 3.1 μg protein/g body weight. The addition of HgCl₂ and application of heat at 50°C decreased the lethal toxicity of ECP. When heated at 100°C, ECP lethality to flounder was completely inhibited. After intramuscular injection of ECP into flounder, it showed evident histopathological changes including necrosis of muscle, extensive deposition of haemosiderin in the spleen, dilated blood vessels congested with numerious lymphocytes in the liver. These results showed that ECP protease was a lethal factor produced by the bacteriumV. anguillarum M3. Contribution No. 4213 from the Institute of Oceanology, Chinese Academy of Sciences. Funded by projects under the Major State Basic Research Development Program, Grant G1999012003.