IHOS-100中概念模式语言的应用   总被引：3，自引：2，他引：1       下载免费PDF全文

周晖  刘仲刚  贾建军 《海洋测绘》2009,29(4):57-59

国际海道测量组织已经开发了新的海道测量数据地理空间标准S-100，新标准采用了与现在使用中的标准S-57有较大区别的建模方式。从概念、数据定义、表现方式等方面，对S-100中使用的概念模式语言——统一建模语言作了简单探讨，并对其在我国未来数字海图生产与信息标准化中的应用前景做出展望与建议。  相似文献   

S-52表示库的实现方式与扩展   总被引：1，自引：0，他引：1  

孟婵媛  翟京生  陆毅  刘颖  徐晓晗 《海洋测绘》2003,23(4):36-38

介绍了国际海道测量组织(IHO)电子海图内容和显示规范(S-52)的技术特点，提出了制作符合S-52标准符号库的必要性，实现了以表示库的显示生成器为指导、以目标的符号化为主线的海图的S-52显示。并结合现有海图生产体系的特点，进一步尝试将S-52符号库扩展，以达到海图图式的要求。  相似文献   

以16S和16S—23S rDNA间区为靶区建立副溶血弧菌(Vibrio parahaemolyticus) PCR快速检测技术     

邓先余  王智学  陈晓艳  何建国 《海洋与湖沼》2007,38(6):555-562

提要应用BLAST程序和DNAstar软件,比较分析了5株副溶血弧菌和其他细菌的16S—23S rDNA间区序列,选取IGSIA作为扩增靶区,结合相邻的16S rDNA序列,设计合成了一对特异性引物,通过优化扩增条件,建立了快速检测副溶血弧菌的PCR方法,对其特异性和敏感性进行了探讨,并初步进行了应用研究。结果表明,新建的PCR方法能特异性地扩增出大小为306bp和552bp的2条带,分别对应于副溶血弧菌的IGS0和IGSIA,检测灵敏度为5.6×102CFU/ml,半个工作日即可得到准确的结果,能有效检测出在杂色鲍、凡纳滨对虾和各种水质中的副溶血弧菌,适用于海洋水产动物副溶血弧菌病的早期快速诊断、水产品的检疫及水质环境的监测。  相似文献   

The sulfur isotopic composition of Neoproterozoic seawater sulfate: implications for a snowball Earth?     

Matthew T. Hurtgen  Michael A. ArthurNeil S. Suits  Alan J. Kaufman 《Earth and Planetary Science Letters》2002,203(1):413-429

The present study employs a method for analysis of the sulfur isotopic composition of trace sulfate extracted from carbonates collected in Namibia in order to document secular variations in the sulfur isotopic composition of Neoproterozoic oceanic sulfate and to assess variations in the sulfur cycle that may have accompanied profound climatic events that have been described as the snowball Earth hypothesis. The carbonates in the Otavi Group of Northwest Namibia contain 3-295 ppm sulfate. Positive excursions, to a high of 40‰ (CDT), occur above the lower (Chuos Formation) and upper (Ghaub Formation) glacial intervals in the Rasthof and Maieberg cap carbonates, respectively. Positive excursions at the top of the Rasthof Formation (reaching 51‰) and within the overlying Gruis Formation (34‰) do not appear to correspond to glaciation. The δ³⁴S_sulfate values within the Ombaatjie Formation exhibit shifts over relatively short stratigraphic intervals (tens of meters), varying between ∼15 and 25‰. Cap carbonates from Australia exhibit positive δ³⁴S_pyrite trends with amplitudes similar to those of Namibian δ³⁴S_sulfate, although, more data are necessary to firmly establish these δ³⁴S trends as global in nature. δ³⁴S_sulfate excursions found in Namibian cap carbonates are consistent with the snowball Earth hypothesis in that they appear to reflect nearly complete reduction of sulfate in an isolated, anoxic global ocean, although, there are other mechanisms that may have facilitated these large shifts in δ³⁴S_sulfate. Regardless, the low sulfate concentrations in Otavi carbonates, the high amplitude variability of the δ³⁴S_sulfate curve, and the apparently full reduction of sulfate (as implied from δ³⁴S_pyrite data), even in strata low in C_org, suggest that Neoproterozoic oceanic sulfate concentrations were much lower than modern values. Additionally, the buildup of ferrous iron and banded-iron formations during the Sturtian glacial event would indicate that Fe supply exceeded sulfide availability during the glacials and/or that all sulfide was fixed and buried. This could be construed as further evidence in support of low oceanic sulfate (and sulfide) at this time.  相似文献   

基于S-57数据的纸质海图生产体系研究     

肖京国  贾建军  谭冀川  高王军 《海洋测绘》2012,32(5):42-44

通过分析S-57海图数据与纸质海图在表示地理空间信息的特点,结合两者的共同点提出基于 S-57格式海图数据生产纸质海图的生产体系.提出了点、线、面三种几何形态的物标向纸质海图要素转换的模型以及纸质海图三级审查方法,这对纸质海图生产方式的革新具有重要的意义.  相似文献   

Mineralogy, 57Fe Mössbauer spectra and magnetization of chalcolithic pottery     

R. Keller  L. Masch  J. Pohl  E. Schmidbauer 《Physics and Chemistry of Minerals》2005,32(3):165-174

Three chalcolithic pottery sherds, paint removed from the surface of each sherd, and an unheated red pigment (Tell-Halaf culture, Turkey) were analysed within the frame of archaeometric studies using mineralogical methods, ⁵⁷Fe Mössbauer spectroscopy, magnetization and rotational hysteresis data. From mineralogical results, the individual minerals forming the cores of the sherds were determined. It was found that the sherds are lime-rich. High temperature X-ray analysis on comparable Ca-rich material showed that the established composition is consistent with a firing temperature of 750-950°C. Apart from the pigment, each Mössbauer spectrum of Fe-bearing components consists of dominating paramagnetic doublets, arising mostly from silicate phases, and of a six-line pattern with reduced intensity, due to ferri- and/or antiferromagnetic Fe-oxide phases. For three samples, an Fe³⁺ silicate component of the spectra is clearly dominating, which points to oxidizing conditions during firing. For the others Fe²⁺ and Fe³⁺ components occur in about equal intensities. For the pigment, the magnetic sextet is of similar intensity to the Fe³⁺ silicate component. From magnetic analysis of ferrimagnetic phases it follows that a low percentage of particles of solid solutions -Fe₂O₃ – Fe₃O₄ exist, probably in part 0.1 m in diameter. The ferrimagnetic particles of at least one paint are probably covered by a thin layer of hematite as found from rotational hysteresis data. An attempt is made to draw conclusions from the experimental results, regarding the firing conditions of the sherds and paints.  相似文献   

Empirical behavior of Chayes'' null model     

E. L. Zodrow 《Mathematical Geology》1976,8(1):37-42

Chayes' t-test for closure correlations is developed from various approximations and assumptions. The empirical behavior of this test is observed through the use of random-sampling number matrices of order to thirteen. The experiments demonstrate a lower limit for the reliability of Chayes' model of about 91/100. That is, about one chance in ten remains that an error due to the statistical testing is committed on some product-moment correlations in a given matrix of correlation, given a confidence level of 90 percent. With increase in the number of variables, the test for departure from zero correlation can be used provided the sample size remains small.  相似文献   

On the sensitivity of tidal residuals off the west coast of Britain to mesh resolution     

J. Eric Jones  Alan M. Davies 《Continental Shelf Research》2007

An irregular mesh model of the west coast of Britain is used to examine the sensitivity of tidal residuals to mesh resolution in the region. Computed residuals are compared with earlier published results determined with a high resolution (1 km grid) finite difference model of the eastern Irish Sea. Initial calculations show that tidal residuals are largest in nearshore regions particularly in the vicinity of headlands. Local refinement of the mesh in these regions leads to a more detailed picture of the flow field, particularly adjacent to the coast. Although large scale offshore features of the flow can be resolved using the high resolution finite difference model, such an approach leads to a “stair case” representation of the coastal boundary with an adjacent near coastal region of spurious tidal residuals. By using an irregular mesh that follows the coast, this effect is removed. In the Mersey river region the tidal residual is resolved with a mesh resolution of 120 m, although calculations show that its distribution is particularly sensitive to small scale features of the topography. A variable mesh that can accurately represent the lateral variations in river width and details of topography in both the nearshore and estuarine environment appears essential in modelling the coastal spread of freshwater plumes from rivers and pollutants discharged into the near coastal environment.  相似文献   

数字地球模式下的电子海图应用   总被引：5，自引：1，他引：4  

李宏利  李汉荣 《海洋测绘》2004,24(1):66-70

从数字地球与电子海图的关系入手,讨论了数字地球概念下的电子海图应用模式,给出了应遵循的标准和数据组织方法,探讨了电子海图无缝拼接、无级缩放、通用接口、分层显示、双向查询等功能的实现原理。  相似文献   

环境因子对南极菌Pseudoalteromonas sp.S-15-13多糖合成关键酶UGD基因表达的影响          下载免费PDF全文

李江  沈继红  何培青  林学政  谭姣姣  李光友 《海洋与湖沼》2010,41(6):824-828

以南极菌Pseudoalteromonas sp.S-15-13为材料,采用实时定量PCR的方法研究了温度、冻融循环及培养基中NaCl、葡萄糖含量和pH对多糖合成关键酶基因ugd表达水平的影响。结果表明,低温有利于ugd的表达,在2℃和10℃培养温度下,培养24h后ugd的表达量约为20℃时的4倍;冻融循环后,ugd的表达量上调,第2个冻融循环后ugd的表达量较对照提高了6.85倍;NaCl对ugd的影响表现为低促高抑,即NaCl含量为6.0%时ugd的表达量是对照(3.0%)的3.97倍,但含量达9.0%时ugd表达量仅为对照的2/5;葡萄糖能够提高ugd的表达量,当含量为2.0%时ugd表达量为对照的13.68倍;在一定范围内(pH5.0—8.0),pH的改变会促进ugd的表达,当pH为6.0时ugd表达量约为pH7.0时的2.15倍。  相似文献