基本气象资料质量控制综合判别法的研究   总被引：27，自引：10，他引：17       下载免费PDF全文

王伯民 《应用气象学报》2004,15(Z1):50-59

对于气象资料质量控制中单项检验为可疑的数据,如何进一步判别它的错误与正确,是气象资料质量控制中的一个重大技术问题.气象资料质量控制综合判别法就是试图解决这个问题而新研制的一种方法.该文概述了气象资料质量控制综合判别法的基本思路、基本内容和步骤;就气象资料质量控制综合判别法在地面气象资料质量控制中的应用举例说明;并进一步阐述了气象资料质量控制综合判别法的加权判别技术.气象资料质量控制综合判别法已在中国气象局气象信息中心气象资料室的地面资料质量控制中得以应用.  相似文献   

神经网络方法在岩性识别中的应用   总被引：8，自引：3，他引：5  

马英杰  周蓉生 《物探化探计算技术》2004,26(3):220-223

在可地浸砂岩型铀矿测井工作中,铀矿地球物理测井方法提供了电阻率、密度、声波等多种地球物理参数。通过采用神经网络方法,利用上述参数．进行钻孔岩性识别的有关研究,确定了B-P网络结构及算法,并进行了初步应用和对比。  相似文献   

Statistical Interpretation of Webnet Seismograms By Artificial Neural Nets     

Plešinger  Axel  Růžek  Bohuslav  Boušková  Alena 《Studia Geophysica et Geodaetica》2000,44(2):251-271

We employed multilayer perceptrons (MLP), self organizing feature maps (SOFM), and learning vector quantization (LVQ) to reveal and interpret statistically significant features of different categories of waveform parameter vectors extracted from three-component WEBNET velocigrams. In this contribution we present and discuss in a summarizing manner the results of (i) SOFM classification and MLP discrimination between microearthquakes and explosions on the basis of single-station spectral and amplitude parameter vectors, (ii) SOFM/LVQ recognition of initial onset polarities from PV'-waveforms, and (iii) a source mechanism study of the January 1997 microearthquake swarm based on SOFM classification of combined multi-station PV-onset polarity and SH/PVamplitude ratio (CPA) data. Unsupervised SOFM classification of 497 NKC seismograms revealed that the best discriminants are pure spectral parameter vectors for the recognition of microearthquakes (reliability 95% with 30 spectral parameters), and mixed amplitude and spectral parameter vectors for the recognition of explosions (reliability 98% with 41 amplitude and 30 spectral parameters). The optimal MLP, trained with the standard backpropagation error method by one randomly selected half of a set of 312 mixed (7 amplitude and 7 spectral) single-station (NKC) microearthquake and explosion parameter vectors and tested by the other half-set, and vice versa, correctly classified, on average, 99% of all events. From a set of NKC PV-waveform vectors for 375 events, the optimal LVQ net correctly classified, on average, 98% of all up and 97% of all down onsets, and assigned the likely correct polarity to 85% of the onsets that were visually classified as uncertain. Optimal SOFM architectures categorized the CPA parameter vector sets for 145 January 97 events individually for each of five stations (KOC, KRC, SKC, NKC, LAC) quite unambiguously and stable into three statistically significant classes. The nature of the coincidence of these classes among the stations that provided most reliable mechanism-relevant information (KOC, KRC, SKC) points at the occurence of further seven statistically significant subclassses of mechanisms during the swarm. The ten neural classes of focal mechanisms coincide fairly well with those obtained by moment tensor inversion of P and SH polarities and amplitudes extracted from the seismograms interactively. The obtained results, together with those of refined hypocenter location, imply that the focal area consisted of three dominant faults and at least seven subfaults within a volume of not more than 1 km in diameter that likely were seismically activated by vertical stress from underneath.  相似文献   

The seismic disturbance on 1986 August 1 near Novaya Zemlya: a source of concern?   总被引：1，自引：0，他引：1  

P. D. Marshall  R. C. Stewart  R. C. Lilwall 《Geophysical Journal International》1989,98(3):565-573

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BOOK REVIEWS     

《The Professional geographer》1987,39(4):487-521

Book Reviewed in this article: Geographical Aspects of Health and Disease in India . Rais Akhtar and A.T.A. Learmonth , eds . Antarctic Treaty System: An Assessment . Proceedings of a Workshop at Beardmore South Field Camp, Antarctica. American Electoral Mosaics . J. Clark Archer and Fred M. Shelley . Kompas op Suidwes-Afrika/Namibie . W.S. Barnard , ed . Jerusalem in the 19th Century: The Old City . Yehoshua Ben -Arieh . The World as a Total System . Kenneth E. Boulding . A Social History of Housing 1815–1985, Second Ed . John Burnett . Human Migration . W.A.V. Clark . Regional Population Projection Models . Andrei Rogers . The State of Population Theory: Forward from Malthus . David Coleman and Roger Schofield , eds . Imagining Tomorrow: History, Technology and the American Future . Joseph C. Corn , ed. Swidden Agriculture in Indonesia: The Subsistence Strategies of the Kalimantan Kantú . Michael R. Dove . Glacial Geologic Processes . David Drewry . Physics of Desertification . Farouk El -Baz and M.H.A. Hassan , eds . Housing the Homeless . Jon Erickson and Charles Wilhelm , eds . Settlement Patterns in Missouri: A Study of Population Origins, with a Wall Map . Russel L. Gerlach . Desert Development: Man and Technology in Sparselands . Yehuda Gradus , ed . Nuclear Winter. The Evidence and Risks . Owen Greene , Ian Percival and Irene Ridge . The Take-off of Suburbia and the Crisis of the Central City . Günter Heinritz and Elisabeth Lichtenberger , eds . Regional Input-Output Analysis . Geoffrey J. D. Hewings . Spatial Transportation Modeling . Christian Werner . The Atlas of Georgia . Thomas W. Hodler and Howard A. Schretter , eds . Latin America. 5th ed . Preston E. James and C.W. Minkel . Applied Remote Sensing . C.P. Lo . Localities, Class, and Gender . The Lancaster Regionalism Group . Urban Social Movements: The City after Castells . Stuart Lowe . Politics and Method . Doreen Massey and Richard Meegan , eds . Land Use . A. S. Mather . The Kingdom of Coal . Donald L. Miller and Richard E. Sharpless . The Presidio and Militia on the Northern Frontier of New Spain, A Documentary History, Vol. 1: 1570–1700 . Thomas H. Naylor and Charles W. Polzer , S.J., comps . and eds . Nuclear Power: Siting and Safety . Stan Openshaw . The Central African Republic: The Continent's Hidden Heart . Thomas O'Toole . Environmental and Dynamic Geomorphology . Márton Pécsi , ed . Remote Sensing Principles and Interpretation . Floyd F. Sabins , Jr . Acid Rain and Friendly Neighbors: The Policy Dispute between Canada and the United States . Jurgen Schmandt and Hilliard Roderick , eds . Earth's Changing Surface: An Introduction to Geomorphology . M.J. Selby . International Migration: The Female Experience . Rita J. Simon and Caroline B. Brettell , eds . On Geography and Its History . D.R. Stoddart . Transportation Networks: A Quantitative Approach . D. Teodorovic . Processes in Physical Geography . R.D. Thompson , A.M. Mannion , C.W. Mitchell , M. Parry , J.R.G. Townshend . Imaging Radar for Resources Surveys . J.W. Trevett . Dominance and Affection: The Making of Pets . Yi -Fu Tuan . Capturing the Horizon. The Historical Geography of Transportation since the Transportation Revolution of the Sixteenth Century . James E. Vance , Jr . Nations at Risk: The Impact of the Computer Revolution . Edward Yourdon .  相似文献   

Application of Fisher method to discriminating earthquakes and explosions using criterion m_b/M_S     

边银菊 《地震学报(英文版)》2005,18(4)

Introduction Earthquake magnitude is a measurement of earthquake intensity, which is one of the basic seismic parameters. The body-wave magnitude mb and surface-wave magnitude MS are based re- spectively on different wave spectrum amplitudes, therefore, the magnitude used as a criterion has its sound physical basis, which is in fact to distinguish the frequency components of seismic waves excited by explosion and earthquake. The magnitude criterion has a very clear physical meaning. Proposed …  相似文献   

构造地球化学-判别分析在找矿中的应用--以呼盟甲乌拉银多金属矿床为例   总被引：3，自引：0，他引：3  

赵清泉  孙传斌  荆龙华  王大平 《矿产与地质》2005,19(4):414-417

以呼盟甲乌拉银多金属矿床为例,利用构造地球化学-判别分析方法,通过对其判别标志的探讨,研究断裂构造的含矿性.此项研究对在甲乌拉地区和相邻地区找矿具有重要意义.  相似文献   

Variations of foliar carbon isotope discrimination and nutrient concentrations in Artemisia ordosica and Caragana korshinskii at the southeastern margin of China’s Tengger Desert   总被引：1，自引：0，他引：1  

Liangju Zhao  Honglang Xiao  Xiaohong Liu 《Environmental Geology》2006,50(2):285-294

Seasonal variations in foliar stable carbon isotope discrimination (Δ) of Artemisia ordosica and Caragana korshinskii and correlations of foliar Δ with N, P, and K concentrations were studied under different planting regimes at the southeastern margin of China’s Tengger Desert. Foliar Δ, N, P, and K concentrations and the correlations of Δ with N, P, and K differed between the species and planting regimes. Foliar Δ, P and K concentrations in A. ordosica were markedly higher than in C. korshinskii, while foliar N concentrations in C. korshinskii was significantly higher than in A. ordosica. There were no significant differences in N, P, and K concentrations in C. korshinskii between planting regimes, but foliar Δ was significantly increased after June in mixed-species planting. In A. ordosica foliar N concentrations in mixed-species planting and foliar Δ in single-species planting were significantly higher than those of corresponding planting regimes. According to water-use efficiency (WUE) calculated based on foliar Δ, and on N, P, and K concentrations, C. korshinskii’s survival may profit from its higher WUE, whereas A. ordosica can avoid drought damage by its higher P and K concentrations in leaves in arid or semi-arid environments. The complex correlations of foliar Δ with foliar N, P and K suggested that water in C. korshinskii and water and P nutrition in A. ordosica were the key factors limiting their growth.  相似文献   

基于GIS和聚类分析的矿井突水水源快速判别   总被引：1，自引：0，他引：1  

郑琳  孙亚军 《江苏地质》2006,30(4):299-302

基于GIS强大数据库功能和模糊聚类分析方法,建立模糊综合评判模型进行矿井突水水源快速判别,同时利用GIS可视化技术将评判结果直观地显示给用户。尝试将该系统应用于河南某矿区,结果表明该系统简便易行,评判结果切合实际,也验证了该系统的可靠性。采用该系统软件可高效准确地完成未知突水水样的水源判别,为煤矿安全生产提供决策依据。  相似文献   

Independent component analysis for UXO detection in highly cluttered environments     

Chandra S. Throckmorton  Stacy L. Tantum  Yingyi Tan  Leslie M. Collins   《Journal of Applied Geophysics》2007,61(3-4):304-317

Statistical signal processing techniques have shown progress in discriminating UXO from clutter when the objects occur in isolation. Under this condition, only a single object contributes to the measured sensor data. For multiple closely spaced subsurface objects, however, the unprocessed sensor measurement is a mixture of the responses from several objects. Consequently, the unprocessed measurements cannot be used directly to discriminate UXO from clutter. In this paper, we implement independent component analysis (ICA), a well-established blind source separation (BSS) technique, to recover the unobserved object signatures from the mixed measurement data obtained by simulating electromagnetic induction (EMI) sensor data, and then use the recovered signatures for UXO/clutter discrimination. Discrimination performance depends on multiple factors, including the number of clutter objects in proximity to the UXO, the separation distance between the UXO and clutter, and the number of mixed measurements available. Simulation results are presented illustrating the impact of these factors on discrimination performance.  相似文献