基于遥感分类的植被覆盖度提取     

潘建平  叶焕倬 《测绘信息与工程》2007,32(6):17-19

阐述了基于遥感分类进行植被覆盖度提取的方法,分析了直接利用关系模型提取植被覆盖度的缺点,遥感分类可获得不同类型地物,此后关系模型分别提取,解决了直接利用关系模型提取中存在的缺点.  相似文献   

On Some implications of the Poisson relation     

FBocchio 《Geophysical Journal International》1998,133(1):207-208

The potentialities of the so-called 'Poisson relation', which holds for uniformly magnetized bodies of constant density, for showing the connections between the gravitational and the magnetic fields of such bodies are considered. In particular, it is seen that the same characteristic ratios occur among the components of the magnetic field intensity and the components of the gradient tensors of the two fields, both locally and non-locally. It is also shown that along the magnetization axis of the body the gradient tensor of the magnetic field displays a 'tidal' structure.  相似文献   

THE CONSTITUTIVE RELATION OF DEBRIS FLOW 1     

SHEN Shouchang 《国际泥沙研究》1998,(3)

ＴＨＥＣＯＮＳＴＩＴＵＴＩＶＥＲＥＬＡＴＩＯＮＯＦＤＥＢＲＩＳＦＬＯＷ１ＳＨＥＮＳｈｏｕｃｈａｎｇ２ＡＢＳＴＲＡＣＴＩｎｏｒｄｅｒｔｏｉｎｖｅｓｔｉｇａｔｅｔｈｅｓｔｒｅｓｃｏｎｓｔｉｔｕｔｉｖｅｒｅｌａｔｉｏｎｏｆｄｅｂｒｉｓｆｌｏｗ,ｔｈｅｅｘｐ...  相似文献   

Nonlinear magnitude frequency relation and two types of seismicity systems     

Shi-Jun Chen  Zhi-Cai Wang  Jiu-Qing Tao 《地震学报(英文版)》1998,11(2):207-218

A nonlinear magnitude frequency equation has been derived in this paper on the assumption that all seismicity systems hold fractal characteristics, and according to the differences of relevant coefficients in the equation, seismicity systems are classified into two types: type I, the whole earthquake activity is controlled by only one great unified system; type II, the whole earthquake activity is controlled by more than one great system. One type of seismicity system may convert to the other type, generally. For example, a type I system will change to a type II system prior to the occurrence of a strong earthquake in North China. This change can be regarded as an index for earthquake trend estimation. In addition, the difference between b value in nonlinear magnitude frequency equation and that in linear equation and the term dΔM related to the coefficients of nonlinear terms obtained in this paper are proved to be a pair of available parameters for medium short term earthquake prediction.  相似文献   

Metallogenic focus-area and superlarge mineral deposits in the bordering zones between China,Russia and Mongolia     

Shaokang Hu  Hongquan Yan  Mao Ye  Weidong Xiang 《中国科学D辑(英文版)》1998,41(1):28-34

Two deep-sea cores in the northwest Pacific have been analysed for sedimentology, mineralogy and environmental magnetism. The results show that after eliminating the interference from volcanism, several proxies such as quartz content, mass susceptibility and anhysteretic magnetic remanence can be used to indicate the eolian deposit from East Asia, and provide information on paleo-atmospheric circulation. A comparison of eolian record in Cure RC10-175 with its oxygen isotopic curve has revealed that the peaks of eolian accumulation occurred at the climatic “optimum” of the Holocene and the last interglaciation, showing the fairly complex nonlinear relationship between continental/pelagic eolian records and the global glacial cycles as well as within the climatic and environmental system. Project supported by the National Natural Science Foundation of China (Grant No. 9291104)  相似文献   

河西走廊东部甜菜含糖量预测模式   总被引：1，自引：0，他引：1  

罗晓玲  刘明春 《干旱气象》1998,(2)

运用灰色系统理论中的关联度方法,分析影响武威黄羊镇糖厂含糖量的气象因素,并建立了不含导数项的线性静态模式。经残差修正后,预测精度达９８．１１％。  相似文献   

土地规划与土地使用制度改革的关系     

黄俊华  吴郭泉 《南方国土资源》2000,13(2):49-50,58

文章在论述土地利用总体规划和土地使用制度政策的基础上,分析了两者之间的关系,并就土地利用中出现的问题提出对策.  相似文献   

Estimation from incomplete data files based on magnitude-frequency relation for earthquakes     

G. R. Dargahi-Noubary  Mehdi Razzaghi 《Mathematical Geology》1990,22(4):513-521

The problem of incorporating the available seismological information provided by the major events of the historical catalog with those for the short period of instrumental data is investigated. Assuming that the frequency-magnitude law of Gutenberg and Richter is valid for both periods, an estimation procedure for the main parameter of this law and the rate of earthquake occurrence for historical period is presented. Application of the proposed method is demonstrated, using both real and simulated data. An extension to allow for variable quality of complete data with different magnitude values is also included.  相似文献   

Mode identification of terrestrial ULF waves observed by Cluster: A case study   总被引：1，自引：0，他引：1  

Y. Hobara  S.N. Walker  M. Dunlop  M. Balikhin  O.A. Pokhotelov  H. Nilsson  H. Rme 《Planetary and Space Science》2007,55(15):2257-2260

Using multipoint measurements from the Cluster mission wave identification techniques are applied to observations of ULF waves made in the terrestrial foreshock with the aim of identifying the modes and properties of the waves taking into account the effects of a high beta plasma. The wave properties in the spacecraft and plasma rest frames are experimentally derived using minimum variance analysis. Two waves with periods of 30 and 3 s dominate the dynamic frequency spectrum. The results indicate that these waves propagate in the fast magnetosonic and Alfvén/Ion Cyclotron modes, respectively. Both waves propagate in the upstream direction in the plasma rest frame but are convected downstream in the spacecraft frame. The measured wave properties in the plasma rest frame are in good agreement with those obtained from the theoretical kinetic dispersion relation taking into account the effects of different plasma beta. The dispersion results show a rather significant deviation from fluid model, especially when high beta plasma conditions occur. These experimentally derived foreshock ULF wave properties are in good agreement with previous results but when the effects of a high beta plasma are considered it is not as straight forward to choose the correct wave mode branch.  相似文献   

Mass-luminosity relation for massive stars     

E. A. Vitrichenko  D. K. Nadyozhin  T. L. Razinkova 《Astronomy Letters》2007,33(4):251-258

A catalog of massive (⩾10 M _⊙) stars in binary and multiple systems with well-known masses and luminosities has been compiled. The catalog is analyzed using a theoretical mass-luminosity relation. This relation allows both normal main-sequence stars and stars with peculiarities: with clear manifestations of mass transfer, mass accretion, and axial rotation, to be identified. Least-squares fitting of the observational data in the range of stellar masses 10M _⊙ ⩽ M ≲ 50 M _⊙ yields the relation L ∼ M ^2.76. An erratum to this article is available at .  相似文献