基于高光谱数据的壁画底稿信息提取     

侯妙乐  雷勇  芦鑫  张学东  韩晓梦 《测绘科学》2014,39(10)

壁画底稿有助于探测壁画艺术的历史信息,具有重要的研究价值,本文设计了半自动提取壁画底稿信息的“三步法”:针对高光谱数据量大、相邻波段相关性高的特点,利用主成分分析实现原始数据的降维;选出含底稿信息量大的特征波段;并利用最大似然分类法实现基于特征波段合成影像的壁画底稿信息提取.结果表明,该方法能够减少数据处理量,提高分类效率与分类精度,明显恢复壁画的底稿轮廓,为以后的文化遗产保护工作提供一个可行的方案.  相似文献   

Observations of the 3.3-μm UIR band in the Red Rectangle: relation to unidentified optical emission     

T. H. Kerr  M. E. Hurst  J. R. Miles  P. J. Sarre 《Monthly notices of the Royal Astronomical Society》1999,303(3):446-454

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BIF微量稀土元素分析方法及其在冀东司家营铁矿中的应用   总被引：3，自引：2，他引：1  

李文君  靳新娣  崔敏利  王长乐 《岩石学报》2012,28(11):3670-3678

以硅铁条带交替出现为特征的条带状铁建造(BIF)是世界上最重要的铁矿资源类型,精确分析磁铁矿的化学组成具有重要意义。本文开展了磁铁矿样品不同溶样方法分析结果的比对,并详细分析和讨论了冀东司家营铁矿磁铁矿与燧石单条带的微量及REE元素分析的地球化学特征。分析结果表明,对于磁铁矿样品,常规HF+HNO₃溶样法与HBr+HNO₃组合溶样法具有一致的溶样效果;司家营BIF的Zr,Sc,Th含量极低,表明未受陆源碎屑的污染;铁质与硅质具有低LREE、高HREE、La和Y正异常的海水REE特征,同时具有Eu正异常的热液REE特征;Ce负异常的缺乏,说明当时的古海洋是一个缺氧的环境。研究发现富铁条带的稀土总量大于富硅条带的稀土总量,这可能与硅、铁沉积物的地球化学习性相关,铁质沉积物更易吸收稀土元素。富矿和普通矿石具有原生的热液与海水的混合来源,部分富矿受到后期流体的强烈扰动,甚至表现出热液流体的特征。  相似文献   

联合GEE与多源遥感数据的黑龙江流域沼泽湿地信息提取     

宁晓刚  常文涛  王浩  张翰超  朱乾德 《遥感学报》2022,26(2):386-396

湿地是地球上最重要的生态系统之一,在维持全球生态环境安全等方面发挥着举足轻重的作用.由于湿地独特的水文特征,传统的湿地监测需要耗费大量的人力和财力,对于大尺度的湿地信息提取更是困难重重.随着大数据和云计算的兴起,为大尺度和长时间序列的空间数据处理提供了契机.本文基于Google Earth Engine(GEE)云平台...  相似文献   

The mid- and near-infrared structures of seven young stellar bipolar outflows     

J. P. Phillips  J. A. Pérez-Grana 《Monthly notices of the Royal Astronomical Society》2009,393(2):354-376

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DIAGNOSTIC ANALYSIS OF ASYMMETRIC SPIRAL RAINBANDS AROUND THE LANDING OF TYPHOON HAITANG (2005)     

王勇  丁治英  李勋  王群 《热带气象学报(英文版)》2010,16(2):143-153

By using WRF mesoscale model, this paper carries out a numerical simulation and diagnostic analysis of the structural characteristics of the asymmetric spiral rain bands around the landing of Typhoon Haitang during the period of July 19 to 20, 2005. The result indicated that the two rainbands associated with the precipitation centre was mainly located northeast of the typhoon centre. The movement and intensity of the southern rainband corresponded well with the 850-hPa positive vorticity band from 0200 to 1800 UTC July 19, 2005. Under the effect of cyclonic circulation, the positive vorticity band at 850 hPa connected with a southern rain band, leading to the intensification of rainfall in the southern centre of the precipitation. The southward rainband gradually moved toward and then merges with the northward one, strengthening the rainfall in the northern centre of the precipitation. Besides, the relationship between the heavy rainfall and the divergence field of vertical shear wind in the high altitude is analyzed. Finally, the relationship is revealed between the development of the vertical component of convective vorticity vector and the rainfall near the two centres of precipitation in the low altitude.  相似文献   

Centrifuge model tests on sand specimen under extensional load     

H. Wolf  D. Knig  Th. Triantafyllidis 《国际地质力学数值与分析法杂志》2005,29(1):25-47

The appearance of shear banding in granular materials has been investigated intensively during the last decades and is still of ongoing importance in terms of understanding the stress–strain behaviour of the material, the localization phenomena and the interaction between soil and structure. Only less attention has been paid to the occurrence of systems of shear bands although such systems can be identified in geotechnical structures as well as in geological formations. In this paper we present results of experiments on sand specimens under extensional load in natural gravity as well as in increased gravity in the centrifuge where the influence of the stress level on the geometry of a shear band pattern, specified by the spacing of the shear bands and the angle between failure surfaces and minor stress direction, has been investigated. X‐ray technique has been used to visualize the failure zones inside the specimen, an optical measurement system called Digital Image Correlation has been applied to identify and observe the appearing deformation mechanism on the sides of the specimens in natural gravity as well as during the flight in the centrifuge. It can be shown that the geometry of the shear band pattern is sparsely influenced by the change of the stress level. Copyright © 2004 John Wiley & Sons, Ltd.  相似文献   

High-resolution observations of the near-infrared emission from NGC 6822 Hubble V     

Sungho Lee  Soojong Pak  Sang-Gak Lee  Christopher J. Davis  Michael J. Kaufman  Kenji Mochizuki  Daniel T. Jaffe 《Monthly notices of the Royal Astronomical Society》2005,361(4):1273-1280

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Broad-band colours and overall photometric properties of template galaxy models from stellar population synthesis     

Alberto Buzzoni 《Monthly notices of the Royal Astronomical Society》2005,361(2):725-742

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珊瑚荧光的古降水记录   总被引：3，自引：0，他引：3  

贺剑峰  彭子成  何学贤  张兆峰  刘桂建 《海洋地质与第四纪地质》2001,21(2):63-68

珊瑚作为热带海洋气候环境的信息载体，不仅记录了过去海洋信息，也记录了陆源环境信息。Isdale于1984年在《Nature》杂志上发表论文阐明珊瑚的黄绿荧光记录了Burdekin河的径流量变化以后，国际上对珊瑚荧光的研究逐渐发展起来，并取得了不少成果。研究表明，利用珊瑚荧光所提供的信息，可以重现过去大陆沿海的降雨变化情况、干旱或洪涝的变化旋回及入海河流的径流量变化。这对研究并重建过去气候环境、预报未来的气候变化趋势有着重要的意义。本文评述了国外对珊瑚荧光的研究进展、报道了本实验室进行了初步工作，同时，对珊瑚荧光作为环境地球化学新的代用指标所潜在的应用前景进行了讨论。  相似文献