The extant genus Eutheia (Coleoptera: Staphylinidae: Scydmaeninae) discovered in Upper Cretaceous Taimyr amber     

《Cretaceous Research》2016

The Eutheiini includes over 90 extant species classified in seven genera and distributed predominantly in the Northern Hemisphere. So far only one extinct genus and species unambiguously placed in this tribe has been known, Archeutheia, from Albian of Spain. We report the discovery of Eutheia, a member of the largest extant genus of Eutheiini, in Santonian of northern Siberia. Extant species of Eutheia are primarily defined on the basis of male genital characters, and the specimen discovered in Taimyr amber is a female; consequently it is described as Eutheia sp. The new finding remarkably extends the known range of Eutheiini during Cretaceous over the area of about 6 thousand kilometers, from the Iberian Plate to northern Siberia. A long morphological stasis in Eutheia suggests that this genus was associated with stable mesic microhabitats of the upper soil layers or rotten wood for at least 83 my.  相似文献   

表格式的文本文件到HTML格式表格文件的自动转换     

张白一  崔尚森  贾春华 《地球科学与环境学报》1998,(Z1)

本文着重讨论了利用ｊａｖａ语言程序实现表格式文本文件到ＨＴＭＬ格式表格文件的自动转换过程。  相似文献   

点状要素注记位置歧义性量化测度   总被引：1，自引：0，他引：1  

罗广祥  李大军  徐斌 《华东地质学院学报》2003,26(1):91-94

分折了歧义性对点状注记配置质量的影响，提出了量化点状要素注记位置歧义性依托的数学模型——Voronoi图，系统研究了Voronoi图解决这问题的原理，分折了其合理性所在，给出了评定点状要素注记位置歧义性公式，并详细定义了其中涉及参数的含义。本文研究对GIS平台点状要素注记自动化配置功能改善具有一定理论与技术指导作用。  相似文献   

一种基于粗糙集的文本分类规则抽取方法   总被引：2，自引：0，他引：2  

孟庆春  王汉萍  魏天滨  葛艳  高云 《中国海洋大学学报(自然科学版)》2003,33(6):943-949

随着文本数据库的日益增大 ,寻找新的文本数据处理方法变得十分紧迫。本文将粗糙集理论应用于文本自动分类的规则提取 ,提出了基于粗糙集理论的文本分类方法。把文本特征项的权值进行离散化处理后 ,作为规则的条件属性 ,文本所属的类别用作决策属性 ,构造决策表 ,然后通过决策表的知识约简算法提取出文本的分类规则。实验结果表明 ,该方法提取规则的分类正确率较高 ,分类速度较快  相似文献   

旅游景点间细粒度语义交互作用挖掘及模式分析：以云南省为例     

陈宇  秦昆  喻雪松  邢玲丽 《地球信息科学学报》2022,24(10):2021-2032

研究旅游景点语义交互及交互作用模式,对根据游客需求优化旅游格局有重要意义。现有语义交互挖掘方法忽略了文本中包含人感知信息的上下文词汇;此外,缺少以景点交互为单位分析交互作用模式的研究。为此,本文提出了一个景点间细粒度语义交互作用挖掘和模式分析框架。首先抽取文本中景点交互的语境;然后利用TF-IDF关键词抽取和语义网络分析方法,从讨论焦点和语义结构角度挖掘景点间细粒度的语义交互作用;最后结合Spearman秩相关系数、Graph Kernel图相似度度量方法和网络分析方法,分析语义交互作用模式。以云南省2018年游记数据进行实例分析,结果表明：① 利用本文提出的框架可以挖掘和分析各个景点间细粒度的语义交互作用,辅助有关部门结合游客意见提升旅游体验;可以分析语义交互作用模式,发现优化旅游格局的关键路线片段;② 苍山-洱海应着重提升自然风光体验;而大理古城-洱海应考虑改善游客对品牌旅游资源关注不足的问题;③ 云南省单核心集聚型、单核心辐射型、多区域合作型景点语义交互模式共存,呈现出点轴渐进扩散特征。可利用中介中心性较高且跨区域的景点交互,推动其他2种模式向多区域合作型转化,推进全域旅游战略实施。本文研究可为旅游路线推荐以及平衡旅游格局提供参考。  相似文献   

Vertebrate ichnites from the Boulder Creek Formation (Lower Cretaceous: middle to ?upper Albian) of northeastern British Columbia,with a description of a new avian ichnotaxon,Paxavipes babcockensis ichnogen. et isp. nov.     

《Cretaceous Research》2015

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Climate-induced change of environmentally defined floristic domains: A conservation based vulnerability framework     

《Applied geography (Sevenoaks, England)》2015

Global climate change is having marked influences on species distributions, phenology and ecosystem composition and raises questions as to the effectiveness of current conservation strategies. Conservation planning has only recently begun to adequately account for dynamic threats such as climate change. We propose a method to incorporate climate-dynamic environmental domains, identified using specific environmental correlates of floristic composition, into conservation strategies, using the province of KwaZulu-Natal, South Africa as a case study. The environmental domains offer an approach to conservation that conserves diversity under current and future climates, recognising that the species constituting diversity may change through time. We mapped current locations of domains by identifying their positions in a multi-dimensional environmental space using a non-hierarchical iterative k-means clustering algorithm. Their future locations were explored using an ensemble of future climate scenarios. The HadCM2 and GFDL2.1 models represented the extreme ranges of the models. The magnitude of change in each environmental domain was calculated using Euclidean distances to determine areas of greatest and least stability for each future climate projection. Domains occurring in the savanna biome increase at the expense of domains occurring in the grassland biome, which has significant negative consequences for the species rich grasslands. The magnitude of change maps represents areas of changed climatic conditions or edaphic disjunctions. The HadCM2 model predicted the greatest overall magnitude of change across the province. Species with specific soil requirements may not be able to track changing climatic conditions. A vulnerability framework was developed that incorporated climatic stability and habitat intactness indices. The mean magnitude of change informed the potential speed of transition of domains between the vulnerability quadrants. The framework informs appropriate conservation actions to mitigate climate change impacts on biodiversity. The study explicitly links floristic pattern and climate variability and provides useful insights to facilitate conservation planning for climate change.  相似文献   

大数据环境下地质资料的存储策略与文本化导入技术     

刘文毅  邓吉秋  韩肖肖 《江苏地质》2019,43(3):367-371

在分析地质资料文档内容与形式特征的基础上,提出Hadoop大数据环境下的地质资料一体化耦合数据模型与存储策略,分析确定HDFS下地质资料文本化目标格式,并对地质资料原始格式、转换后的文本格式及地质信息的存储方式与模式进行设计;研究常见地质资料格式的文本化实现方式,并构建文本转换技术流程。为大数据环境下地质资料的文本导入提供技术路径,以及大数据环境下文本化地质资料的信息抽取、融合等智能化处理提供统一数据基础,对地质资料大数据分析具有实际意义。  相似文献   

QT图形库下基于OpenType字库的复杂文本显示研究     

姚大富  杨斌 《成都信息工程学院学报》2010,25(6)

当前的操作系统和应用软件对复杂文本的少数民族文字处理相当有限,不利于信息的交流.通过对QT图形库下的复杂文本引擎的分析,得出基于OpenType字库技术复杂文本显示技术一般过程,对需要支持少数民族文字的操作系统和软件设计有一定的帮助作用,可用于指导支持民族文字的软件设计.  相似文献   

北京市平谷电厂王都庄水源地资源计算与评价研究   总被引：1，自引：0，他引：1  

吕晓俭  魏连伟 《水文地质工程地质》2000,27(1):23-25

平谷电厂王都庄水源地先后经历了普查、说查及勘探阶段。资源计算与评价建立在多项长系列实测资料的基础上,多种上方法相互验证。在利用多年地下水动态、溢出量测流以及大型群孔抽水试验资料进行地下水资源计算上具有特色。  相似文献