Matlab在北京飞机增雨航迹分析中的应用     

汪晓滨  吕亚丽  王广河  张蔷  刘新建  毛节泰 《气象》2006,32(7):46-51

飞机航迹分析是飞机云物理和大气环境探测中进行飞行探测资料整合中的一项重要工作，在GPS航迹资料分析中，资料的不连续和经纬度数据进制换算是飞机探测作业分析中常遏的问题。根据北京2004年增蓄型飞机人工增雨探测作业试验期间GPS航迹数据特点，通过Matlab分析讨论其中的问题，利用Matlab良好的矩阵运算功能，对航迹经纬度数据进行换算，并根据航迹记录时间的连续性特点，提出了对不恰当、丢失和重复数据的判断分析方法。分析使用表明，在飞机探测作业航迹分析中，Matlab可以很方便地进行数据分析处理，并能将结果进行多维可视化显示。  相似文献   

浅谈县级气象局学习气象事业发展战略的几点思考     

吕燕 《山东气象》2006,26(4):43-44

结合学习中国气象事业发展战略研究成果,深入分析了县级气象局的基本状况、社会地位以及存在的困难和问题与中国气象事业发展战略要求的差距,阐述了当前适合县级气象局发展的思路和对策.  相似文献   

基于3S技术土地利用现状数据库更新方法探讨     

韩春建  吴克宁  冯新伟  吕巧灵  郑信伟 《国土资源信息化》2006,(2):30-33,47

本文研究了基于3S技术的1:1万土地利用现状更新调查的方法,针对其中遇到的若干问题进行了探讨,认为正射影像图制作时必须注意精度问题,影像解译采用自动分类与目视解译相结合的方法可以提高效率保证解译精度;外业调绘补测应该严把质量关,以保障整个工程的精度,外业调绘结果采用直接矢量化可以减少工作量,以减少误差;重新划分图斑号可以方便外业调查和今后土地管理工作;建议数据建库时采用地形图校正可以提高数据库的精度。  相似文献   

高密度空间采样地震数据特点分析   总被引：3，自引：0，他引：3  

蔡希玲  刘学伟  邓春艳  吕英梅 《应用地球物理》2006,3(1):48-54

中国陆相沉积盆地的地质结构复杂,储层岩性的多变,需要有高精度的勘探方法。高密度空间采样是提高地震勘探精度的一项新技术。本文简要说明了点激发和点接收技术,分析高密度空间采样的野外工作方法,介绍了Gijs j．o．Vermeer提出的对称采样原理,从波场连续性的角度探讨了高密度空间采样技术。重点分析高密度空间采样数据的特点, 即:高密集的初至波有利于近地表结构的调查,可提高静校正的精度;小偏移距、小点距接收增加了浅层的有效覆盖次数,提高浅层反射的成像精度; 对规则噪声可实现无假频采样,室内的噪声分析和噪声压制的精度随着提高;高密度采集使波场连续性增强,使得各种数学变换的精度提高,有利于不同波场的分离。最后指出高密度空间采样地震勘探技术的难点在于室内数据处理,针对海量数据的分析和处理方法还需要进行深入细致的研究工作。  相似文献   

深基坑支护的信息化施工     

律文田 《岩土工程技术》2007,21(3):153-155

论述了信息化施工技术;在施工过程,将监测数据结合基坑工程的实际情况进行综合分析,利用监测数据进行反馈设计和分析,对后续施工具有实践与理论意义。介绍了某深基坑工程的施工监测,说明了信息化施工的重要性。通过对信息化施工过程中数据的分析、信息归纳和实践经验的总结,对以后类似工程的施工具有一定的参考价值。  相似文献   

北京石花洞第四纪钟乳石剖面的年代学研究          下载免费PDF全文

吕金波赵树森  李铁英汪训一 李红春 《中国地质》2007,34(6):993-1002

北京石花洞位于房山花岗岩体边缘向形带的东北扬起端,与北京猿人遗址南北相望。地层为460Ma前形成的中奥陶统马家沟组石灰岩,洞穴大形态从25Ma前的上新世开始形成,洞内钟乳石从0.37Ma前的中更新世开始形成。在中国岩溶洞穴中,北京石花洞的层数最多,洞穴钟乳石种类齐全,裂隙渗透水沉积的石盾多、体积大,滴水沉积的石笋叠置关系明显,池水沉积的月奶石发育好,全新世石笋微层理发育清晰。该洞的大形态反映了北京西山新构造运动的期次,可以同华北地文期和永定河阶地对比,洞内钟乳石记录了中更新世以来北京西山古环境的变化,可以建立第四纪剖面,与周口店洞穴群碎屑沉积物剖面进行对比。钙板的铀系年龄为334.99～366.74ka,可定名钙板组。粗犷石笋的铀系年龄为169～235ka,粗犷石笋的电子自旋共振年龄为130～518ka,为中更新世沉积,可定名云水洞组。杆状石笋的铀系年龄为14.9±2.1～100.3±11.1ka,为晚更新世沉积,可定名石花洞组。在全新世石笋中,微层与微层之间存在厚约1μm的条带状纹线,是划分微层层数的标志,具有微层理的石笋14C年龄为为0.58～2.50ka,AMS14C年龄为为130±100～670±130a,可定名守备支洞组。  相似文献   

莒县长岭镇整合矿产资源促进矿业经济可持续发展     

赵庆芳  吕东平 《山东国土资源》2007,23(8):62-63

日照市莒县长岭镇走规模化、集约化经营之路,使该镇一度陷入低谷的砖瓦产业重新焕发生机,一度外流的投资业户重新归来。截至目前,全镇砖瓦厂已发展到30余处,形成年消耗页岩粘土60万m3,年产砖瓦4.2亿片(块)的生产能力。产品畅销省内外,甚至国外,年产值过亿元,仅此一项税收就占全  相似文献   

Impact assessment of the "Grain for Green Project" and discussion on the development models in the mountain-gorge regions     

Xiaoqing Zhao  Xing Lv  Jinhua Dai 《Frontiers of Earth Science》2010,4(1):105-116

To restore China’s degraded ecological environment, the government has launched an environmental restoration project named the “Grain for Green Project” (GGP) in 1999. From 1999 to 2010, the government will spend 40 billion dollars to convert 147 million ha of croplands and 173 million ha of wastelands into forestlands and grasslands in 25 provinces, municipalities and autonomous regions. A primary goal is to replace cropping and livestock grazing in fragile areas with trees and grass. Given the tremendous scale and great number of participants in the project, the attitudes of the affected farmers and the future development in the area where GGP is implemented have a direct influence on the success of the project. To gain a clear idea about the farmers’ attitudes towards the project and put forward the development models for the forestlands converted from croplands, two case sites in the mountain-gorge region in Nujiang River are selected as the study areas, and the methods of field survey and semi-structured interview are adopted to make interviews with more than 100 households in 2002 and 2003 in order to quantify the farmers’ opinions about the GGP and how it has affected their livelihood, socio-cultural and industrial structures, etc. The results are as follows: 1) the project has a certain influence on the farmers with better economic basis and exerts greater influence on the farmers living in the low-elevation regions than on those living in the regions with middle-high elevation; 2) the production models of the local farmers has changed from cultivation and animal husbandry to forestry and sidelines due to the project and the income structure has changed from animal husbandry as main income source to state subsidy and sideline as main income sources; 3) the reduction in the grain income and decrease in the quantity of livestock because of the project have led to the diminution in the total income of the farmers; 4) the project has resulted in changes in the lifestyles and architecture styles of the local farmers, and the traditional “huotang” culture has gone away after the implementation of the project; 5) energy utilization has changed from firewood to methane and electricity in the wake of the implementation of the project. The above-mentioned study results have indicated that the GGP has truly exerted influence on the livelihood and production of the local farmers. Therefore, it is very necessary to make a research into the development models in the forestlands converted from croplands to resolve the problems of the farmers’ livelihood and production. The study results will provide some references for the sustainable development of the mountain-gorge regions.  相似文献   

Identification of five sea cucumber species through PCR-RFLP analysis     

Yingchun Lv  Rong Zheng  Tao Zuo  Yuming Wang  Zhaojie Li  Yong Xue  Changhu Xue  Qingjuan Tang 《中国海洋大学学报(英文版)》2014,13(5):825-829

Sea cucumbers are traditional marine food and Chinese medicine in Asia. The rapid expansion of sea cucumber market has resulted in various problems, such as commercial fraud and mislabeling. Conventionally, sea cucumber species could be distinguished by their morphological and anatomical characteristics; however, their identification becomes difficult when they are processed. The aim of this study was to develop a new convenient method of identifying and distinguishing sea cucumber species. Polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) analysis of mitochondrial cytochrome oxidase I gene (COI) was used to identifing five sea cucumber species (Apostichopus japonicus, Cucumaria frondosa, Thelenota ananas, Parastichopus californicus and Actinopyga lecanora). A 692 bp fragment of COI was searched for BamHI, KpnI, PstI, XbaI and Eco31I restriction sites with DNAMAN 6.0, which were then used to PCR-RFLP analysis. These five sea cucumber species can be discriminated from mixed sea cucumbers. The developed PCR-RFLP assay will facilitate the identification of sea cucumbers, making their source tracing and quality controlling feasible.  相似文献   

Effects of sulfate chitosan derivatives on nonalcoholic fatty liver disease     

Mingming Yu  Yuanhong Wang  Tingfu Jiang  Zhihua Lv 《中国海洋大学学报(英文版)》2014,13(3):531-537

Sulfate chitosan derivatives have good solubility and therapeutic effect on the cell model of NAFLD. The aim of this study was to examine the therapeutic effect of sulfate chitosan derivatives on NAFLD. The male Wistar rats were orally fed high fat emulsion and received sulfate chitosan derivatives for 5 weeks to determine the pre-treatment effect of sulfate chitosan derivatives on NAFLD. To evaluate the therapeutic effect of sulfate chitosan derivatives on NAFLD, the rats were orally fed with high concentration emulsion for 5 weeks, followed by sulfate chitosan derivatives for 3 weeks. Histological analysis and biomedical assays showed that sulfate chitosan derivatives can dramatically prevent the development of hepatic steatosis in hepatocyte cells. In animal studies, pre-treatment and treatment with sulfate chitosan derivatives significantly protected against hepatic steatohepatitis induced by high fat diet according to histological analysis. Furthermore, increased TC, ALT, MDA, and LEP in NAFLD were significantly ameliorated by pre-treatment and treatment with sulfate chitosan derivatives. Furthermore, increased TG, AST, and TNF-α in NAFLD were significantly ameliorated by treatment with sulfate chitosan derivatives. Sulfate chitosan derivatives have good pre-treatment and therapeutic effect on NAFLD.  相似文献