双频RTK灵锐S80接收机在工程测量中的应用     

于世岩  陈强 《测绘与空间地理信息》2007,30(1):123-125

分析了RTK测量技术的产生,发展及利用现状,然后以株洲市110平方千米1∶500地形图修测需要为例,着重从测设速度、灵活性、数据结构等方面探讨数字地图怎样以较全面的数据信息来为用户提供更好的服务。  相似文献   

3S技术在红寺堡开发区土地详查中的应用   总被引：1，自引：0，他引：1  

张永红 《测绘与空间地理信息》2007,30(4):48-49,54

为了掌握红寺堡开发区土地利用现状,合理利用土地,为促进可持续发展提供决策依据,我们利用RS,GPS和GIS等技术对红寺堡开发区土地利用现状进行了调查。本文简要介绍了3S技术应用于红寺堡开发区土地详查的具体方法。  相似文献   

Isolation and diversity analysis of heterotrophic bacteria associated with sea anemones   总被引：2，自引：0，他引：2  

DU Zongjun  ZHANG Wanyi  XIA Hongjie  L&#; Guoqiang  CHEN Guanjun 《海洋学报(英文版)》2010,29(2):62-69

A study was undertaken to investigate the heterotrophic bacterial flora associated with the sea anemones. Samples of the sea anemones Anthopleura midori were collected from the coast of Weihai and bacteria were isolated from these samples. Additionally, high numbers of viable bacteria were obtained from the celom wall and surface of anemone, the community of cultivable bacteria was very diverse. As a result of this isolation, 60 strains were obtained, 56 of them were selected for identification and characterization by 16S rRNA gene sequence analysis and limited phenotypic testing. Among these isolates, 16 strains were phylogenetically related to members of the genus Pseudoalteromonas and neighboring taxa. Other isolates included members of the genera Colwellia, Vibrio, Acinetobacter, Pseudomonas, Endozoicomonas, Roseovarius, Paracoccus, Loktanella, Leisingera, Sulfitobacter, Bacillus, Staphylococcus, Plantibacter, Microbacterium, Micrococcus, Joostella, Psychroserpens, Cellulophaga, Krokinobacter, Polaribacter and Psychrobacter. Seven potential novel species were found. Among 60 strains, 17 of them can produce proteolytic exoenzyme, 20 can produce lipolytic exoenzyme. Strain NQ8 has strong antagonistic effects on some Vibrio strains. This study demonstrates that the culturable fraction of bacteria from the sea anemones Anthopleura midori is diverse and appears to possess much potential as a source for the discovery of novel bioactive materials.  相似文献   

基于双谱估计的BL Lac天体S5 0716+714光变周期     

唐洁  张雄 《海洋学报》2010,32(10):7516-7522

大幅度、快速光变是BL Lac天体的重要特征之一,光变研究对探索BL Lac天体内部的物理过程和机理具有特殊的意义.从大量文献中收集了BL Lac天体S5 0716+714光学V,R,I 3个波段从1994年到2008年的有效观测数据,并将这些数据30天平均后进行自回归模型(AR)的双谱估计. 双谱的等高线图和对角切片图表明,双谱估计能消除噪声的干扰来提取有用信息,抑制了噪声、提高了信噪比,有很高的分辨率,避免了伪峰的出现,能准确地认证BL Lac天体的光变周期值.由V,R,I 3个波段的双谱等高线图和对  相似文献   

Short-term variability of suspended sediment and phytoplankton in Tampa Bay,Florida: Observations from a coastal oceanographic tower and ocean color satellites     

Zhiqiang Chen  Chuanmin HuFrank E. Muller-Karger  Mark E. Luther 《Estuarine, Coastal and Shelf Science》2010

We examined short-term phytoplankton and sediment dynamics in Tampa Bay with data collected between 8 December 2004 and 17 January 2005 from optical, oceanographic, and meteorological sensors mounted on a coastal oceanographic tower and from satellite remote sensing. Baseline phytoplankton (chlorophyll-a, Chl) and sediment concentrations (particle backscattering coefficient at 532 nm, bbp(532)) were of the order of 3.7 mg m⁻³ and 0.07 m⁻¹, respectively, during the study period. Both showed large fluctuations dominated by semidiurnal and diurnal frequencies associated with tidal forcing. Three strong wind events (hourly averaged wind speed >8.0 m s⁻¹) generated critical bottom shear stress of >0.2 Pa and suspended bottom sediments that were clearly observed in concurrent MODIS satellite imagery. In addition, strong tidal current or swells could also suspend sediments in the lower Bay. Sediments remained suspended in the water column for 2–3 days after the wind events. Moderate Chl increases were observed after sediment resuspension with a lag time of ˜1–2 days, probably due to release of bottom nutrients and optimal light conditions associated with sediment resuspension and settling. Two large increases in Chl with one Chl > 12.0 mg m⁻³ over ˜2 days, were observed at neap tides. For the study site and period, because of the high temporal variability in phytoplankton and sediment concentrations, a monthly snapshot can be different by −50% to 200% from the monthly “mean” chlorophyll and sediment conditions. The combination of high-frequency observations from automated sensors and synoptic satellite imagery, when available, is an excellent complement to limited field surveys to study and monitor water quality parameters in estuarine environments.  相似文献   

中国北方沿海潮间带常见镜蛤的种类     

刘泽浩  李捷  杨学玲  王海艳  李永强  张素萍  徐凤山 《海洋科学》2010,34(12):30-35

在形态学和分子生物学(28S rRNA、COI部分序列)分析的基础上,对我国北方典型海区辽宁丹东,山东烟台、威海,江苏连云港的常见镜蛤进行了取样和分类地位的研究。结果表明:日本镜蛤(Dosinia japonica)、薄片镜蛤(Dosinia corrugata)和饼干镜蛤(Dosinia biscocta)为我国北方沿海潮间带常见且大量分布的种类,其中饼干镜蛤与日本镜蛤的遗传距离比较接近(以较高支持率聚为一支)。连云港的饼干镜蛤以及丹东的薄片镜蛤的不同个体间存在差异,对这两地区的样品还有待作进一步的研究。  相似文献   

海南养殖罗非鱼(Oreochromis niloticus)致病链球菌的分离、鉴定及其药敏试验   总被引：2，自引：0，他引：2  

祝璟琳  杨弘  邹芝英  李大宇  肖炜 《海洋与湖沼》2010,41(4):590-596

采用常规的形态及生理生化特性检验、API20strep快速鉴定及分子生物学等方法,对引起2009年海南罗非鱼大规模死亡的病原菌进行了致病性、表型生物学,分子生物学及药敏试验的系统研究。结果表明,2株分离菌均为无乳链球菌,对罗非鱼具有很强的致病性。分离菌16SrRNA基因序列(GenBank登录存取号分别为GU363869和GU363870)与其它链球菌的16SrRNA基因同源性相似性在96.5%—100%之间,所测2株病原菌16SrRNA基因之间的同源性为100%。16SrRNA基因构建的系统进化树表明,2株病原菌均与无乳链球菌聚类。药敏试验结果表明,分离菌株对头孢类药物、阿莫西林、强力霉素等27种试验药物较敏感,对复方新诺明、卡那霉素等11种试验药物不敏感,对庆大霉素的敏感性不同。  相似文献   

3S技术在湿地生态环境保护中的应用综述     

刘涛  胡友健  肖本林 《地理空间信息》2007,5(4):67-70

湿地是地球上生物多样性最丰富的生态系统之一,有着巨大的生态服务功能。以3S技术为代表的现代测绘技术,由于在数据和信息的获取、加工、管理与服务等方面较传统测绘技术有了长足的进步,其在湿地生态环境保护中的应用具有广阔的前景。拟对3S技术在湿地生态环境保护中的应用现状作一综述,对存在的问题进行分析,并探讨其发展趋势。  相似文献   

3S在数字地球时代的新发展     

魏波  汤军  胡正舟 《地理空间信息》2007,5(5):80-82

3S集成技术理论是新近兴起的地球信息科学的技术性理论基础。一般认为,3S集成是指将RS、GPS、GIS这三种对地观测新技术有机地集成在一起。从3S各自的技术特点及发展历程入手,浅谈了各自在数字地球时代的新特色,以及在实际中的应用。  相似文献   

基于“3S”技术的南流江采砂点时空分布特征     

朱文轩  黎树式  冯炳斌  杨夏玲 《热带地理》2022,42(12):2076-2087

利用Landsat系列遥感数据,通过目视解译的方式分析了南流江近30年的采砂点的时空分布特征及其环境效应,并探讨其驱动因素。结果表明：南流江采砂点数量在1988—2008年快速上升,2018年的采砂点数量出现大幅下降;各时期均为下游采砂点最多,中游次之,上游最少。采砂点时空分布的主要驱动因素是流域的经济快速发展带来的城市化快速扩张,2018年采砂点数量下降的主要原因是相关部门加强对非法采砂活动的监管。采砂活动是南流江含沙量下降的重要原因之一,同时也是南流江水质下降的重要原因;采砂活动使得南流江采砂区域面积在1988—2018年总共减少了7.24 km²;目前河口三角洲岸线并没有因为采砂活动的加剧输沙量减少而发生明显的蚀退。  相似文献