The Application of GIS to the Urban Environmental Geological Survey in Sichuan     

YOU Li-jun  SONG Yun  MA Xiao-bo  JIANG Yu 《四川地质学报》2008,28(3)

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贝西斜坡构造特征、油气分布规律及控油因素     

杜先芳  李占东  柳成志  YANG Li-hua  YOU Xin 《上海国土资源》2008,(1):63-65

贝西斜坡位于海拉尔盆地贝尔凹陷西北部地区,目前处于勘探时期,勘探面积约700km^2,目的层系主要为南屯组,为一套扇三角洲一湖泊沉积体系。在深入了解海拉尔盆地贝尔凹陷区域构造背景的基础上,探讨了贝西斜坡的构造特征、构造演化过程及油气成藏条件,总结了贝西斜坡的油气聚集规律。  相似文献   

Research Methods of Water Resources Carrying Capacity: Progress and Prospects     

LI Yi  YANG Yanzhao  YAN Huimin  YOU Zhen 《资源与生态学报(英文版)》2018,9(5):455-460

The study of water resources carrying capacity (WRCC), a major component of resources and environment carrying capacity (RECC), began relatively recently. However, WRCC has witnessed a rapid development in terms of concept, calculation methods, and empirical research in recent years. WRCC has become an important criterion for rational development and utilization of regional water resources. This paper first briefly reviews the development process of WRCC. It then evaluates and contrasts the representative research methods of conventional trend (CT), system dynamics (SD), multi-objective model analysis (MOMA), comprehensive evaluation (CE), and dynamic simulation recursive (DSR). The results show that although there are various methods of WRCC, the major methods used have become out-of-date and stagnant, and new more sophisticated methods and technologies are lacking. Specifically, our analysis found that the index system, scientific robustness and comprehensiveness of evaluation criteria of current research methods are insufficient and need to be improved. In addition, the dynamic research of WRCC should receive more attention, and it requires further study to make it more applicable to real-world uses. Finally, a set of monitoring and early warning systems should be established and applied in demonstration areas to meet the urgent needs of water resource management in the new era.  相似文献   

A New Method to Predict Erythrocyte Sedimentation Rate with Natural Geographical Factors and Location by Case-based Reasoning: A Case Study of China     

YANG Qingsheng  YOU Xibin  ZHANG Hongxian  Kevin MWENDA  WANG Yuandong  HUANG Ying 《中国地理科学(英文版)》2020,(1):157-169

Reference values of erythrocyte sedimentation rate(ESR)are the key to interpret ESR blood test in clinic.The common local reference ESR values are more accuracy in blood test that are established with natural geographical factors by using the multiple linear regression(MLR)model and the artificial neural network(ANN).These knowledge-based methods have limitations since the knowledge domains of ESR and natural geographical factors are limited.This paper presents a new cases-depended model to establish reference ESR values with natural geographical factors and location using case-based reasoning(CBR)since knowledge domain of ESR and geographical factors is weak.Overall 224 local normal ESR values of China that calculated from 13623 samples were obtained,and the corresponding natural geographical factors and location that include altitude,sunshine hours,relative humidity,temperature,precipitation,annual temperature range and annual average wind speed were obtained from the National Geomatics Center of China.CBR was used to predict the unseen local reference ESR values with cases.The average absolute deviation(AAD),mean square error(MSE),prediction accuracy(PA),and Pearson correlation coefficient(r)between the observed and estimated data of proposed model is 33.07%,9.02,66.93% and 0.78,which are better than those of ANN and MLR model.The results show that the proposed model provides higher prediction accuracy than those of the artificial neural network and multiple linear regression models.The predicted values are very close to the observed values.Model results show significant agreement of cases data.Consequently,the model is used to predict the unseen local reference ESR with natural geographical factors and location.In spatial,the highest ESR reference areas are distributed in the southern-western district of China that includes Sichuan,Chongqing,Guangxi and Guizhou provinces,and the reference ESR values are greater than 23 mm/60 min.The higher ESR reference values are distributed in the middle part and northern-eastern of China which include Hubei,Henan,Shaanxi,Shanxi,Jilin and Heilongjiang provinces,and the reference ESR values are greater than 18 mm/60min.The lowest ESR reference values are distributed in the northern-western of China that includes Tibet and Xinjiang,and the reference ESR values are lower than 5 mm/60min.  相似文献   

手机地图显示尺度划分方法研究     

吴月  游天  王骁 《测绘科学技术学报》2016,(3)

随着移动通信技术的发展,手机地图逐渐成为人们获取位置信息的重要工具。由于手机地图具有屏幕小,快速移动和近距离阅读等特点,所以手机地图内容各要素的分层显示特征更为明显,这要求手机地图显示尺度的划分更加精细。而现有基础电子地图多尺度显示模型无法完全适用于手机地图多尺度显示。为此,针对不同要素视觉感受的差异性,利用眼动实验定量确定了手机地图各要素载负量的权重和计算方法。在此基础上,综合考虑不同要素载负量对显示尺度划分的影响,提出了一种利用主成分迭代分析建立手机地图多尺度显示模型的方法。并与现有基于地图面积载负量建立的地图多尺度显示模型进行了分析比较,为今后手机地图多尺度显示提供科学的参考依据。  相似文献   

大菱鲆周期蛋白依赖激酶基因cdk1、cdk6克隆及表达分析   总被引：1，自引：0，他引：1  

郭佳伟  朱香萍  吴志昊  宋宗诚  范兆飞  谭训刚  尤锋 《海洋科学》2016,40(4):12-21

通过同源克隆以及5′/3′RACE的方法扩增得到大菱鲆(Scophthalmus maximus)细胞周期蛋白依赖激酶基因cdk1和cdk6的全长c DNA序列,在m RNA水平上分析了它们组织表达特征,并对比分析了静水压处理对其胚胎期表达的影响。结果显示,cdk1基因全长c DNA序列为1281 bp(Gen Bank登录号:KP339306),编码区为912 bp;cdk6基因c DNA全长1400 bp(Gen Bank登录号:KT186374),编码区长度为978 bp。组织RT-PCR分析表明,cdk1基因表达具有广泛性,在性腺、肾脏等生长发育较快的组织中表达量较高;cdk6基因也在多个组织中表达,在性腺中表达量最高。通过Real time RT-PCR检测基因在胚胎中的表达水平发现,静水压处理组cdk1、cdk6在胚胎发育中,总体变化趋势与对照组类似。大菱鲆胚胎对照组中cdk1在原肠期以前相对神经胚期及以后时期表达量较高,静水压处理组基因表达变化与对照组趋势相同;对照组中cdk6在原肠期出现表达高峰,但静水压处理组在原肠期表达量相对较低。静水压处理对cdk1和cdk6的表达量的影响不同,这可能与基因还有除调控细胞周期的其他功能有关。为解析这两个基因在大菱鲆胚胎发育中的作用及其机制提供了参考。  相似文献   

PCA-SIFT 特征匹配算法研究     

李钦  游雄  李科  张彦喜 《测绘工程》2016,25(4):19-24

SIFT特征具有旋转、尺度和明暗变化的不变性,在图像匹配中得到广泛应用。针对SIFT特征匹配中耗时长、匹配点对少、准确率低的问题,提出PCA-SIFT特征匹配的方法。使用更加精简的方法构建特征点描述向量,通过预先构建的投影矩阵对描述向量进行主成分分析,降低描述向量的维度从而提高了特征匹配的速度,同时降维也对描述向量进行了去噪提纯,使得匹配更加准确。实验证明,利用PCA-SIFT特征进行匹配在降低匹配耗时的同时,增加了匹配点对,匹配准确率也得到提高。  相似文献   

基于MODIS数据的PM2.5反演在大气污染监测中的应用   总被引：1，自引：0，他引：1  

张智  白穆  游浩妍 《测绘科学》2016,41(9):42-46

针对基于传统10km气溶胶光学厚度产品计算PM2.5无法获得更为精细的PM2.5空间分布特征的问题,提出采用6S模型计算获得不同气溶胶光学厚度条件下辐射传输模型方程参数查找表,该查找表可以采用原始光谱波段信息进行数据反演,并结合暗像元法计算得到的地表反射率信息,在辐射传输模型方程计算结果的基础上进行线性插值获得1km气溶胶光学厚度,再利用地面实测PM2.5浓度数据,通过回归分析的方法,获得1km的PM2.5监测数据。以西安市为例,1km分辨率的PM2.5更进一步表现了西安市域内PM2.5的空间分布特征,具有明显的地形分异特征,而且呈现出从城区向郊区逐渐衰减的趋势。研究结果为小区域的PM2.5来源和变化分析提供了一种有效的技术途径。  相似文献   

塔里木盆地玉北5井下奥陶统蓬莱坝组沉积期的暴露标志及其意义     

蔡习尧  李慧莉  尤东华  高晓鹏  马宇驰 《岩石学报》2016,32(3):915-921

塔里木盆地玉北地区玉北5井下奥陶统蓬莱坝组,属于局限台地潮坪沉积,主要为一套灰、浅灰色泥晶白云岩、灰色藻纹层(藻席)、灰质云岩与细粉晶云岩。首次在岩芯中发现多个层位发育暴露标志,包括钙结壳、渗流豆石、碴状层、溶洞。溶洞主要发育在第10回次下部,碴状层、钙结壳、渗流豆石发育在第10回次中上部至第5回次。蓬莱坝组这些暴露标志的确认,说明玉北地区早奥陶世特马豆克期有一定规模的海平面下降事件,可能是储层形成的重要控制因素。  相似文献   

北京平原地区第四纪地质研究新进展   总被引：2，自引：1，他引：1       下载免费PDF全文

蔡向民  张磊  郭高轩  尤世娜  方同明  吕金波  梁亚楠 《中国地质》2016,(3):1055-1066

北京平原地处山前冲洪积扇分布区,区内湖泊密布,河流纵横,沉积环境多样。由于第四系三维结构的复杂性,对第四系进行地层划分有一定的难度。前人根据不同的资料对北京平原第四系进行过地层划分,建立了泥河湾组、周口店组、马兰组等多个岩石地层单位。这些地层单位主要是依据沉积凹陷钻孔岩心中的孢粉、有孔虫、介形虫等化石和少量的古地磁数据划分的,实际上仍是年代地层单位。由于这些地层单位划分依据不统一,识别标志不清晰,因此难以得到广泛的共识。近十余年来,随着资料的积累和对第四系三维结构的认识提高,特别是古地磁测年技术的普及,为北京平原第四纪地层的划分奠定了基础。本文依据40余个钻孔的古地磁测试数据,初步厘定了下更新统底界、中更新统底界、上更新统底界3个等时面。依据工程地质勘察、水文地质钻孔、考古发掘和泥炭调查等资料编绘了平原区全新统等厚度图。  相似文献