丽江高美古的二期选址—筛选点的筛选     

钱铜铃汪从云  岑学奋王建成 《天文研究与技术》2001,(2):48-54

介绍了丽江高美古二期选址的筛选工作，经过踏勘确定高美古周围山头的10个点为筛选点，采用小型轻便望远镜于1998年10月16至1999年1月27日进行目视衍射环观测，并对取得的资料作了处理、分析和初步探讨。观测发现各点的视宁度没有明显差别，6  相似文献   

改进的单纯形法及其在非线性参数估计中的应用   总被引：3，自引：0，他引：3  

李春风  许承权  蒲文利 《海洋测绘》2009,29(6):14-16

采用了改进的单纯形法，该算法利用遗传算法的变异操作来增强单纯形法的全局搜索能力，既兼顾了全局收敛性，又具有高效的局部搜索能力。并通过实例验证了该算法的优越性，以及应用于测量上的非线性最小二乘估计的可行性。  相似文献   

地下卤水中镭的富集与测定方法研究          下载免费PDF全文

魏伟  康兴伦  江雪艳  于志刚  杜金洲  张卫国 《海洋科学》2008,32(11):1-4

以自配人工卤水，采用硫酸钡（镭）共沉淀法富集其中的镭，同时用γ谱仪同步测量^226Ra和^228Ra的含量。不同pH和共沉淀剂作用下的化学及放化回收率计算表明，该方法操作简单，回收率高，适用于地下卤水及其它水体较高含量^226Ra、^228Ra的同步测定。用该方法测定的莱州湾地下卤水^226Ra和^228Ra含量分别为0．341Bq／L和1．615Bq／L，远高于海水中镭的含量。  相似文献   

The effects of temperature and substrate on ontogenetic behavior of bastard halibut, Paralichthys olivaceus (T. et S.)     

刘栋  线薇薇  朱鑫华 《中国海洋湖沼学报》2005,23(1)

1 INTRODUCTION Scientific management of aquacultural andnatural populations studies on the early life historyof flatfishes in the aspects of their metamorphosisand benthic settlement accompanying pronouncedtransitions in morphology, behavior and habitatecology have received much attention (Youson,1988). Accumulated data showed that temperatureand substrate played a main role in the recruitmentsuccess of flatfish during their early development(Rijnsdorp et al., 1995, Gibson and Robb, 2000…  相似文献   

A NEW BIOGENIC SULFIDE CHEMICAL SENSOR FOR MARINE ENVIRONMENTAL MONITORING AND SURVEY     

宋金明  赵卫东 《中国海洋湖沼学报》2001,19(3):282-286

ＩＮＴＲＯＤＵＣＴＩＯＮＢｉｏｇｅｎｉｃｓｕｌｆｉｄｅｐｒｏｄｕｃｅｄｂｙｂａｃｔｅｒｉａｌｓｕｌｆａｔｅｒｅｄｕｃｔｉｏｎｉｓｏｎｅｏｆｔｈｅｍｏｓｔｉｍｐｏｒｔａｎｔｉｎｄｉｃａｔｏｒｓｉｎａｎｏｘｉｃｍａｒｉｎｅｅｎｖｉｒｏｎｍｅｎｔｓ,ｐａｒｔｉｃｕｌａｒｌｙｉｎｃｏｎｆｉｎｉｎｇｂａｙｓ,ｐｏｌｌｕｔｅｄｅｓｔｕａｒｉｅｓａｎｄａｑｕａｃｕｌｔｕｒｅａｒ ｅａｓ.Ｔｈｅｉｎｃｒｅａｓｅｏｆｉｔｓｃｏｎｃｅｎｔｒａｔｉｏｎｕｓｕａｌｌｙｉｎｄｉｃａｔｅｓｗｏｒｓｅｎｅｄｃｏｎｄｉｔｉｏｎｓ.…  相似文献   

不同卫星星历对GPS数据处理的影响     

刘玉利  孙立军  李岩 《测绘与空间地理信息》2009,32(1)

研究了基线解算时分别使用广播星历、快速星历和精密星历时解算结果的影响.对于长基线来讲,使用快速星历和精密星历可以有效提高解算精度,对于短基线,使用广播星历可以保证基线解算的精度.  相似文献   

海域勘界技术的应用   总被引：1，自引：0，他引：1  

张维林 《台湾海峡》2009,28(3):432-436

制订划界方案是海域勘界工作的核心工作，包括资料分析、初拟划界草案、草案协调和协商等阶段．大多数海域界线需要分段划分．勘界实践表明，不同界线及其不同区段的界线必须运用不同的划界技术，如垂直岸线法、水道（航道）中心线法、协议线法、习惯线法、中点连线法、用海界线法及岛礁中间线法等．草案协调是勘界工作的难点，必须采取背靠背协调、面对面协商及反复沟通等方法，促成双方达成共识．  相似文献   

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罗三明  万文妮  高培芝  苏建锋 《大地测量与地球动力学》2007,27(5):123-127

????????????﹫????????????ζ??????????????????????????????????????????????λ????????μ?????????衢????????????????????裬??????????????????????????????????????????????????????????????????????????????????????????????????????侫??????ó???????????????????????ε????????????????????????????????????????????淶????????????????????????????????????????  相似文献   

BOOK REVIEWS     

《The Professional geographer》1982,34(3):352-379

Books reviewed in this article: Aerial Photography and Remote Sensing Aerial photography and image interpretation for Resource Management . DAVID P. PAINE . Analytical Models and Techniques Spatial Processes Models and Applications A. D. CLIFF AND J. K. ORD Quantitative and Statistical Approaches to Geography: A Practical Manual JOHN A. MATTHEWS . Cartography and Maps Map Data Processing . HERBERT FREEMAN AND GOFFREDO G. PIERONI , eds. Computer-assisted Cartography: Principles and Prospects, 1982 . MARK S. MONMONIER . Cultural Navajo Architecture: Forms, History, Distributions . STEPHEN C. JETT AND VIRGINIA E . SPENCER . Rational Landscapes and Humanistic Geography . EDWARD RELPH . Economic The Structure and Control of a State Economy . W. L. L'ESPERANCE . Economic Geography . JAMES O. WHEELER AND PETER O. MULLER . The Myth of the Family Farm: Agribusiness Dominance of U.S. Agriculture . INGOLF VOCELER . Libya: The Experience of Oil . J. A. ALLEN . Geography of Public Finance, Welfare Under Fiscal Federalism and local Government Finance . ROBERT BENNETT . Environmental Management, Resources, and Systems Mountains and Man . LARRY W. PRICE . Environmental Geology . DONALD R. COATES . An Introduction to Environmental Systems . G. H. DURY . The Environment: Chinese and American Views . Edited by LAURENCE J. C. MA AND ALLEN G. NOBLE . Land Use in America . RICHARD H. JACKSON . Medical Conceptual and Methodological Issues in Medical Geography . MELINDA S. MEADE (ed.). Philosophy and Geographic Thought Birds in Egg/Eggs in Bird . GUNNAR OLSSON . PhysicaI Climatology: Selected Applications . J. E. OLIVER . Geomorphological Techniques . ANDREW GOUDIE (ed.). Political Politics, Geography and Behaviour . RICHARD MUIR AND RONAN PADDISON . The State of the World Atlas . MICHAEL KIDRON AND RONALD SECAL . Population The Population of the South . DUDLEY L. POSTON , JR . AND ROBERT H. WELLER , eds. Regional Latin America: Economic Development and Regional Differentiation . ARTHUR MORRIS . Developing the Amazon . EMILIO F. MORAN . Western Europe: A Systematic Human Geography . BRIAN W. ILBERY . Settlement Systems in Sparsely Settled Regions: The United States and Australia . RICHARD E. LONSDALEAND JOHN H. HOLMES , eds. African Perspectives: The Economic Geography of Nine African States . HARM DE BUJ AND ESMOND MARTIN , eds. Rural Nonmetropolitan America in Transition . AMOS H. HAWLEY AND SARA MILLS MAZIE , eds. Social Crime and Environment . R. NORMAN DAVIDSON . The Ghetto: Readings with Interpretations . JOE T. DARDEN , ed. Urban Urban Problems and Planning in the Developed World . MICHAEL PACIONE (ed.) Problems and Planning in Third World Cities . Edited by MICHAEL PACIONE . The City in West Europe . D. BURTENSHAW , M. BATEMAN , AND C. J. ASHWORTH .  相似文献   

An explanation for USGS Station 6 record, 1979 Imperial Valley earthquake: a caustic induced by a sedimentary wedge     

J. A. Rial  V. Pereyra  G. L. Wojcik 《Geophysical Journal International》1986,84(2):257-278

Summary. The largest earthquake-induced acceleration yet recorded occurred at the United States Geological Survey's (USGS) Strong Motion Array Station 6 during the 1979 October 15, Imperial Valley, California earthquake. This large acceleration (1.74 g, vertical component) is anomalously strong considering the low magnitude of the event ( M = 6.4), and the fact that receivers in the immediate neighbourhood of Station 6 recorded much lower accelerations. Previous studies of the records by other investigators have suggested a number of explanations for the anomaly, several of which implicate the near-receiver geological structure.
We present a detailed time and frequency domain analysis of the acceleration records at Stations 6, 5, 7, 8 and Diff Array to suggest that the anomalous acceleration is the consequence of the focusing of the incoming body waves by the lens-like effect of the sedimentary wedge between Imperial Valley and Brawley faults. The analyses include a detailed comparison of observed particle motions between neighbouring stations. Narrow band-pass filtered particle motions at Station 6 reveal the interaction of multipath arrivals as well as the frequency-dependent interference between them. Three-dimensional ray tracing experiments confirm the fact that the faulted sedimentary wedge is capable of focusing P -waves near Station 6. The interpretation that best combines theoretical and observed results is that amplification was due to the formation of an elliptic umbilic caustic with focus near the surface.  相似文献