基于Delaunay三角网的GPS控制网同步环和异步环自动搜索算法研究     

徐昌荣  葛山运 《大地测量与地球动力学》2011,31(1):55-58

计算GPS网中的同步环或异步环闭合差是检核GPS控制网测量精度的重要依据,手工方式费时又容易出错,而某些商业软件搜索闭合环存在一定的缺陷,无法搜索到所有的独立闭合环.为此,在构建Delaunay三角网的基础上,提出了一种新的GPS控制网同步环和异步环自动搜索算法.实验证明,该算法实现了GPS网中所有可能的同步环、异步环...  相似文献   

公众气象服务满意度问卷调查分析   总被引：1，自引：0，他引：1  

韩琳  王鸽  林文桦  张明益 《成都信息工程学院学报》2011,(6):707-710

针对天气预报服务中的不足之处,通过对四川省气象服务满意度的调查评估,为今后提高气象信息在社会、经济等领域的应用提供参考。根据CSIWS测量模型,从受众对气象服务的评价、对气象信息的了解、对气象信息的理解、对气象服务的要求4方面进行调查。有效问卷结果分析表明：（1）公众对四川省“气象部门公众形象”的评价最高,满意度指数达到90．60％;（2）公众对“天气预报准确率”期望值最高,为4．13分;而满意度为3．30分,两者差距0．83分,说明表现尚达不到社会公众的期望值,今后在提高天气预报准确率方面仍需下大力气;（3）评价满意度指数平均值为85．60％,社会公众对气象部门公众形象评价比较高,其余指标的满意度指数都有待进一步提高,但提高的迫切程度各有差异。  相似文献   

一种智能化的避台航线设计方法     

汤青慧  陈戈  刘艳艳 《中国海洋大学学报(自然科学版)》2011,41(6):104-108

为提高船舶气象导航自动化水平,实现避台决策由经验型向智能型转变,提出1种高效、稳定的绕避台风航线规划算法。基于电子海图平台实现GPS、数字化气象信息的多源信息集成,直观显示船舶和台风当前位置和运动态势,基于栅格模型设计避台航线自动生成算法,实现避台航线在线实时规划。仿真结果表明,该方法能够根据气象信息及时重建环境模型并获取新的最优航线,算法对环境的复杂性不敏感,具有稳定性好、求解规模大、效率高的特点。  相似文献   

舟山海域外来物种地中海贻贝的自然分布现状及生态影响     

申望  叶茂  王日昕  石戈  赵淑江 《台湾海峡》2011,30(2):250-256

以筛选的2个可鉴别的地中海贻贝（Mytilus galloprovincialis）、厚壳贻贝（M.coruscus）及其杂交后代的PCR标记（扩增核基因Glu-5’特异片段PCR标记Me14/Me17和延伸因子1α第一个内含子区段PCR标记引物EFbisF/EFbisR）,对舟山海域3个贻贝主产区（马鞍列岛海域、浪岗山列岛海域、中街山列岛海域）采集的贻贝样本的种类进行鉴别.研究结果显示：100个马鞍列岛海域贻贝个体和30个中街山列岛海域贻贝个体均为厚壳贻贝;而54个浪岗山列岛海域贻贝样本中,16个个体（29.6%）为厚壳贻贝,38个个体（70.4%）为地中海贻贝;3个群体中均未检测到2种贻贝的杂交个体.因此,推测舟山海域地中海贻贝自然分布仅局限于局部海区,但在适宜的海区地中海贻贝可取代厚壳贻贝成为贻贝床的优势物种,舟山海域贻贝床的动态变化值得进一步关注;贻贝样本中没有检测到地中海贻贝与厚壳贻贝的杂交个体,表明调查海域可能没有杂交贻贝分布或数量极少,地中海贻贝通过杂交、基因渐渗污染厚壳贻贝基因组的风险较小.  相似文献   

内蒙古额济纳旗千条沟铜多金属矿化区成矿地质特征及找矿方向     

刘永祥  葛桂平  高征西  李文圣 《西部资源》2011,(5):73-76

千条沟铜多金属矿区位于内蒙古自治区额济纳旗千条沟北约6公里,行政区划隶属阿拉善盟额济纳旗所在地达来呼布镇。南东距额济纳旗政府所在地约120公里。工区位于北山山系的东北边缘,六陀山横担在图幅中部。大地构造位置属天山—阴山纬向构造体系的中段。工区地层主要以奥陶系粉砂岩和二叠系板岩为主,岩浆岩以闪长岩、斜长花岗岩、花岗斑岩、花岗岩为主,区内构造受近东西向冲断深大断裂和区域六驼山复背斜影响,主要为次级羽状断裂和张性断裂,多被后期岩浆侵入岩及后期石英脉充填,在工区南西部斜长花岗岩区,发现1号矿脉、2号矿脉、3号矿脉群、4号矿脉群,其地表矿化体均为石英脉,具较强孔雀石化,且肉眼可见铅矾,矿脉走向以南西-北东为主。总的分析,工区南西部为重点找矿区域,物探、化探、地质综合分析的结果都比较吻合,褶皱和断裂较发育,热液活动明显,矿脉品位较高,具有找到铜多金属矿床的成矿条件。  相似文献   

Empirical Analysis on Urbanization Patterns in Zhejiang Province Based on Spatial Economy and GIS     

GE Ying LIANG Qi 《中国地理科学(英文版)》2006,16(3):193-198

1 Introduction For the two past decades of economic reforms in China, the urbanization level has risen dramatically from 17.92% in 1978 to 41.8% in 2004, with the average an- nual increase in the urbanized population of 3.3%. Owing to the social and economic factors, however, the agri- culture, rural area and farmer, named “three agricul- ture-related problems” in the country, have benefited little from the rapid and unprecedented process of ur- banization (Lin and Ho, 2003). Conversely, as…  相似文献   

水文地质研究现状与展望     

王现国  葛雁 《河南国土资源》1999,(3)

我国的水文地质专业是在建国初期逐步建立发展起来的。70年代以来,吸收了欧美国家的一些新理论、新技术,业务领域不断拓展,技术和理论水平明显提高,为国家建设和城市发展做出了重大贡献。但是,在当前社会主义市场经济大潮的冲击下,专业的发展正面临严重困难和挑战。一方面,由于传统业务的萎缩和市场竞争的加剧,迫使许多水文地质专业人员转向岩土工程和其他领域,进而影响了专业理论和技术的发展与进步;另一方面,与地下水勘查、开发、利用、管理和保护有关的水文地质问题日益突出,迫切需求专业理论的延伸发展和技术进步给予解决。作者就我国水文地质研究现状做简要回顾与分析,并对今后发展方向进行探讨。  相似文献   

Normal Reference Value of Red Blood Cell Count of Chinese Presenile Men and Geographical Factors   总被引：1，自引：0，他引：1  

HE Jinwei GE Miao SU Huimin LIANG Wei CHEN Hongfei 《中国地理科学(英文版)》2007,17(1):92-98

This paper aims at providing a scientific basis for unifying the normal reference value standards of red blood cell count of Chinese presenile men. The paper, using microscopical counting method, studies the relationship between the normal reference values of 38,061 samples of red blood cell count of presenile men and eight geographical factors in 297 units in China. It is found that the correlation of geographical factors and the normal reference value of red blood cell count of presenile men is quite significant (F=303.00, P=0.000). By using the method of stepwise regression analysis, one regression equation is inferred. It is concluded that if geographical data are obtained in a certain area, the normal reference value of red blood cell count of presenile men in this area can be reckoned by using the regression analysis. Furthermore, according to the geographical factors, China can be divided into eight regions: Northeast China Region, North China Region, Shanxi-Shaanxi-Inner Mongolia Region, Middle and Lower Reaches of the Changjiang River Region, Southeast China Region, Northwest China Region, Southwest China Region and Qinghai-Tibet Plateau Region.  相似文献   

Thermohaline structure inhomogeneity associated with polynia at the northern margin of Emery Ice-shelf     

蒲书箴  葛人峰  董兆乾  于卫东  史久新  项宝强 《极地研究(英文版)》2007,18(1):18-26

Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area.  相似文献   

The first dinosaur tracksite from Xinjiang, NW China (Middle Jurassic Sanjianfang Formation, Turpan Basin)——a preliminary report     

Oliver WINGS  Rico SCHELLHORN  Heinrich MALLISON  Ben THUY  Wenhao WU  Ge SUN 《世界地质(英文版)》2007,10(2)

A new dinosaur tracksite was discovered in a steeply inclined sandstone layer of the Middle Jurassic Sanjianfang Formation in the Shanshan area of the Turpan Basin. The site is the first record of dinosaur footprints from Xinjiang Province in northwestern China. More than 150 tridactyl theropod dinosaur footprints are preserved as positive hyporeliefs on the lower bedding plane of a fine-grained sandstone body. Most of the footprints are isolated and appear to be randomly distributed. Some show well defined phalangeal pads, heels and rarely indistinct impressions of the distal part of the metatarsus. Two distinct morphotypes are present: a larger type with relatively broad pads shows similarities to Changpeipus and Megalosauripus, and a slightly smaller, slender and gracile type which is similar to Grallator, Eubrontes and Anchisauripus. In both morphotypes, digit III is the longest with a length between 11.4 and 33.6 cm. A single imprint shows prominent scratches, probably formed during slipping of the track maker.  相似文献