我国省区间工业结构的异同与结构转换的调控途径

通过计算分析,本文认为我国省区之间工业部门结构既有趋同性,又存在趋异性;趋同性是基本合理的,而趋异性预示着各省区产业结构进一步调整的方向。我国省区工业结构差异主要发现在综合专业化能力、部门深层结构、结构质量三方面。以此为依据,本文提出了我国省区工业结构转换的调控途径。     

计算正文词汇相似性的一个方法

从分析英语正文(text)长度与其词汇量的关系入手,提出一个词汇相似性方程,以计算不同正文在词汇构成上的相似性,并指出,这一方法可适用于英语、其他拼音语种或非拼音语种,直接为语言教师有目的地比较,选编语言训练教材提供科学依据。     

Eelgrass beds and bare substrata – sparid and mugilid composition in contrasting littoral estuarine habitats

Seagrass beds serve as nursery grounds for many fish species and often play an important role in the juvenile stages of economically and recreationally important fishes. The eelgrass Zostera capensis is the dominant submerged macrophyte in permanently open South African estuaries and occupies large intertidal and subtidal areas within the Knysna system. The primary objective of this study was to compare the occurrence of sparids and mugilids in eelgrass and nearby bare sediment areas using sampling with seine nets. The hypothesis that was tested is that mugilids are dominant in unvegetated areas of the Knysna Estuary littoral whereas sparids predominate within eelgrass beds located in the same zone. The results indicate that the family Mugilidae is better represented at unvegetated sites when compared to members of the family Sparidae, with the exception of Lithognathus lithognathus, but that the dominant three sparids and dominant two mugilids were most abundant in sparse eelgrass beds that included both bare and vegetated areas within this habitat type. The main fish species responsible for the separation of fish assemblages associated with unvegetated sites versus those associated with vegetated areas were Rhabdosargus holubi, Liza dumerili, Liza richardsonii, Lithognathus lithognathus, Sarpa salpa and Diplodus capensis, with R. holubi, S. salpa and D. capensis being mainly attracted to eelgrass habitats and L. dumerili, L. richardsonii and L. lithognathus having a stronger affinity for bare areas. This finding confirms a previous estuarine study in the nearby Swartvlei lake littoral, which found that sparids dominated areas where aquatic macrophytes were extensive and that mugilids became more prevalent at those same sites when the macrophytes underwent complete senescence. The length-frequency distributions of some sparid and mugilid species differed considerably between eelgrass and bare sediment areas, whereas those of other species showed little or no difference between these two habitat types.     

暴雨洪水相似性分析指标体系研究

在实际的防洪决策中,如何将历史暴雨洪水的特性和信息有效地组织和表达,实现与实时预报系统的无缝连接,真正发挥历史暴雨洪水在实时防洪决策中的作用,是提高洪水预报精度和时效,并进行科学的洪水调度决策的前提。本文将实时暴雨洪水与历史暴雨洪水的雨洪信息指标化,运用非平权距离系数法进行相似性分析,最终推选出与实时暴雨洪水相类似的历史暴雨洪水。通过研究与实时暴雨洪水相类似的历史暴雨洪水的发生发展趋势,预测实时暴雨洪水的趋势,从而为实时的洪水调度提供决策支持。本文以1998年松花江流域暴雨洪水为例进行分析,其结果具有较高精度和一定可信度。     

层状介质P波非双曲走时速度误差分析

为提高各向异性非双曲速度分析的精度, 以适应大偏移距和复杂介质条件下的速度分析, 通过总结层状介质非双曲线速度参数估计的基本步骤, 同时利用数值模拟及相似度分析方法验证了非双曲线速度分析的可靠性, 反演出的速度结果与理论值的误差为1% ±。同时, 对各向异性参数η进行了误差分析, 发现η对误差相当敏感, 直接反演所得的η值与理论计算值误差高达12.87% , 因此最好进行直接拾取, 以提高速度分析的精度。     

用地震波频谱计算Q值的新方法

在研究用频谱比率法计算Ｑ值局限性的基础上，提出了基于地震波频谱计算Ｑ值的新方法。利用相邻两个反射信号频谱的主频及其斜率，或对第二个反射信号的频谱进行Ｑ扫描补偿，使该频谱与第一个反射信号频谱间的相似系数最大或两者主频相同的方法计算Ｑ值。这些方法克服了频谱比率法的不稳定性。     

佛道介入与妈祖信仰的嬗变

通过对道教和佛教介入,妈祖信仰在其能指与所指之间流溢动荡过程的梳理,认为妈祖信仰与二者存在"家族相似性"的关系,佛道介入深深地影响并改变了妈祖信仰的形式和内容。     

农业气候相似信息系统

在建立大型农业气候数据库的基础上，研制了“农业气候相似信息系统”，着重介绍该系统的总体设计，原理与功能特点，开发与应用前景等。该系统可迅速查询农业气候相似研究应用动态和世界各地的气候数据；任选指标组合进行农业气候相似计算、排序、可为动、植物引种、扩种提供驯化次序和适宜范围，也可为农业技术交流和研究提供农业气候依据。