利用密钥策略进行数据分离的算法

在分析现有的数据处理策略的基础上,将经过改进的基于二进制Goppa编码的McEliece密码体制与数据份额的产生相结合,提出了一种基于纠错码密码体制的数据分离算法(KPDA)。与经典秘密共享算法相比,该算法具有同等或更高的效率;而与同类的数据分离技术相比,基于编码的密码体制可以提供更好的安全保障。     

金属活动态提取法及其在黑龙江大兴安岭森林覆盖区的应用

介绍了金属活动态的理论依据、成晕机制及提取方法,并应用金属活动态提取法在大兴安岭原始森林覆盖区对已知矿进行试验研究,发现在高寒森林覆盖区,利用金的水提取态异常强度低,异常不明显,而金的粘土结合态和铁锰氧化物结合态异常清晰地反映在矿体上方,异常强度居于中等。金的有机质结合态异常值虽然高,但容易受有机质在样品中颗粒大小等因素的影响而使异常出现多个峰值。总之,利用金属活动态提取法在高寒森林覆盖区进行找矿可以快速有效地确定异常,但要注意排除过多有机杂质在提取过程中的影响。     

变值配置函数空间整体编码族的2维对称性

研究0-1多元变量的逻辑函数及其整体配置函数空间变值编码表示特性。根据对称特性,系统地定义一批整体编码结构:邵雍-Leibniz码、广义码、文王码、伏羲码和共轭码。展示变值向量配置函数空间规模以及函数群集的状态空间组织结构。对各类编码系列的可区分数目,给出计算公式。2维变值展示框架展现在变值配置函数空间中不同编码族具有的内蕴对称特性。分层结构编码配置函数空间和2维展现描述体系,为基于东方逻辑传统的现代逻辑架构:变值逻辑体系,利用高维分析工具探讨0-1序列非线性超复杂逻辑变换开辟道路。     

山东省优势大地构造相划分初步方案

大地构造相是反映陆块区、造山系和叠加造山-裂谷相系形成演变过程中的一套岩石构造组合,是表达大陆岩石圈板块经历离散、聚合、碰撞、造山等动力学和地质构造作用过程而形成的综合产物。根据优势大地构造相的划分原则与沉积岩、火山岩、侵入岩和变质岩建造构造等特征,山东大地构造相可划分为3个相系(Ⅰ级)、4个大相(Ⅱ级)、17个相(Ⅲ级)和51个亚相(Ⅳ级)。     

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?????????????GPS?????ASTER GDEM?????д???????????????????????????θ????е????????????????????????ASTER GDEM????????-??????-????????????????У??????GPS?????????????14.93 m??18.02 m???????????????????н???????????С???????С???????????????????????θ????У?ASTER GDEM???????????????á?     

A Study on Parameterization of Surface Albedo over Grassland Surface in the Northern Tibetan Plateau

The relationship of surface albedo with the solar altitude angle and soil moisture is analyzed based on two-year (January 2002 to December 2003) observational data from the AWS (Automatic Weather Station) at MS3478 in the northern Tibetan Plateau during the experimental period of CEOP/CAMP-Tibet (Coordinated Enhanced Observing Period Asia-Australia Monsoon Project on the Tibetan Plateau). As a double-variable (solar altitude angle and soil moisture) function, surface albedo varies inconspicuously with any single factor. By using the method of approximately separating the double-variable function into two, one-factor functions (product and addition), the relationship of albedo with these two factors presents much better. The product and additional empirical formulae of albedo are then preliminarily fitted based on long-term experimental data. By comparison with observed values, it is found that the parameterization formulae fitted by using observational data are mostly reliable and their correlation coefficients are both over 0.6. The empirical formulae of albedo though, for the northern Tibetan Plateau, need to be tested by much more representative observational data with the help of numerical models and the retrieval of remote sensing data. It is practical until it is changed into effective parameterization formulae representing a grid scale in models.     

特殊地形及地形梯度对西昌发射场暴雨的影响

研究了西昌发射场特殊地形及地形梯度对其暴雨天气的影响。对比分析表明：2004年6月23日暴雨过程属于低涡切变型暴雨,6月27日暴雨过程属于两高辐合型暴雨。利用MM5V3．7进行了多组地形敏感试验,结果表明：场区北侧山脉对场区降水量影响明显,西昌东侧山脉对西昌降水量影响明显。地形梯度分析表明,西昌地区所处的河谷地形和场区所处喇叭口小地形,有利于中小尺度气压扰动的发生、发展和暴雨的产生,当地形梯度减弱时,降水量相应减弱。     

东亚夏季风降水和环流数值模拟对不同对流参数化方案的敏感性

A 5-level spectral AGCM (ImPKU-5LAGCM) is used to examine the sensitivity of the simulated results of the summer monsoon rainfall and circulation in East Asia to different cumulus parameterization schemes in the climatological-mean case and in the cases of weak and strong Asian summer monsoons,respectively. The results simulated with the Arakawa-Schubert＇s(hereafter A-S＇s), Kuo＇s and Manabe＇s cumulus parameterization schemes show that these simulated distributions of the summer monsoon rainfall and circulation in East Asia depend strongly on the cumulus parameterization schemes either in the climatological-mean case or in the cases of weak and strong Asian summer monsoons. From the simulated results, it might be shown that the Kuo scheme appears to be more suitable for the simulation of the summer monsoon rainfall and circulation in East Asia than the A-S scheme or the Manabe scheme, although the A-S scheme is somewhat better in the simulations of the tropical rainfall. This might be due to that the Kuo＇s cumulus parameterization scheme is able to reflect well the characteristics of rainfall cloud system in the East Asian summer monsoon region, where the rainfall system used to be a mixing of cumulus and stratus.     

一种基于视觉特征的地形模型数据提取与快速显示方法

DEM模型是一种重要的地形模型，由于其数据量极其巨大，如何实现快速显示是一个难题。针对DEM地形模型，提出基于视点与观察分辨率的数据抽取及基于法矢量的模型简化的快速绘制方法算法，最后进行实验验证。结果表明，该方法数据压缩量大，绘制速度快，且逼真度无明显变化。     

四川地形扰动对降水分布影响

引入一维加权平均的谱分析方法定量研究四川地形强迫对该区域降水分布的影响。结果表明:纬向地形和冬季降水谱峰锁相于同一波长（475.8 km）,呈共振关系,地形与其他季节降水呈漂移关系,这与经向和纬向上环流变动有关,即冬季纬向环流占主导,纬向地形触发的大气波动对冬季降水策动作用大;夏季降水是各种不同尺度系统相互作用的结果,地形是重要因素之一。经向和纬向地形特征尺度分别为296.8 km和475.8 km,反映了地形强迫的中尺度特征,且纬向地形谱峰比经向大1个数量级,纬向强迫更明显。夏季降水谱峰比冬季大2个数量级,降水系统纬向特征尺度比冬季小约150 km,说明夏季在纬向地形强迫下,降水系统尺度减小的同时其强度大大增加,这在一定程度上可以解释中尺度对流性降水在夏季偏多。四川夏季最大降水位于雅安地区,其地形扰动比四川整体扰动更明显,故产生的降水也更大。夏季降水和经向地形锁相于同一波长（37.1 km）,经向地形对雅安夏季强降水起关键作用。