搜索结果: 46-60 共查到“理学 K-P-Means”相关记录135条 . 查询时间(0.124 秒)
An attempt to find precursors in the ULF geomagnetic data by means of flicker noise spectroscopy
ULF geomagnetic data means of flicker noise spectroscopy
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2009/11/9
The flicker noise spectroscopy which is a new phenomenological method for the retrieval of information contained in chaotic time signals, is based on the analysis of recognizable irregularities (pulse...
AN ESTIMATION OF EVAPOTRANSPIRATION BY MEANS OF THE WATER BALANCE OF A SOIL COLUMN
ESTIMATION OF EVAPOTRANSPIRATION MEANS OF THE WATER BALANCE SOIL COLUMN
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2009/10/30
In this paper water-balance studies of a soil column at an observation site
at Ulvsunda, Stockholm, are reported. The change of the water storage in
the soil was obtained from soil moisture measurem...
Determination of Anisotropy of Tills by Means of Azimuthal Resistivity and Conductivity Measurements
Determination of Anisotropy Means of Azimuthal Resistivity Conductivity Measurements
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2009/10/23
Anisotropy of glacial tills in Lapland revealed with azimuthal galvanic (Terrameter 300 C) resistivity and inductive (Geonics EM-31) electrical conductivity measurements, which were carried out at fou...
K-means 算法中的k 值优化问题研究
空间聚类 K2平均算法 距离代价函数 k 值优化
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2009/9/25
在空间聚类中,最佳聚类数k 求解的关键是构造合适的聚类有效性函数. 典型K2平均算法中的
聚类数k 必须是事先给定的确定值,然而,实际中k 很难被精确地确定,使得该算法对一些实际问题无
效. 文章提出距离代价函数作为最佳聚类数的有效性检验函数,建立了相应的数学模型,并据此设计了
一种新的k 值优化算法. 同时,给出了k 值最优解kopt及其上界kmax的条件,在理论上证明了经验规则
kma...
Estimation of actual evapotranspiration of Mediterranean perennial crops by means of remote-sensing based surface energy balance models
evapotranspiration surface energy balance Mediterranean perennial crops
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2009/7/22
Actual evapotranspiration from typical Mediterranean crops has been assessed in a Sicilian study area by using surface energy balance (SEB) and soil-water balance models. Both modelling approaches us...
Gap filling and noise reduction of unevenly sampled data by means of the Lomb-Scargle periodogram
Gap filling noise reduction Lomb-Scargle periodogram
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2009/7/1
The Lomb-Scargle periodogram is widely used for the estimation of the power spectral density of unevenly sampled data. A small extension of the algorithm of the Lomb-Scargle periodogram permits the es...
Tracking the Satellite 1957 a2»Sputnik I»by means of the finnish radiotheodolite
Tracking Satellite radiotheodolite
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2009/6/19
Tracking the Satellite 1957 a2»Sputnik I»by means of the finnish radiotheodolite.
R. Supper, Spherical Means of Subharmonic Functions
holomorphic functions in the unit disk subharmonic functions in the unit ball zeros of holomorphic functions Riesz measures Blaschke condition
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2009/6/16
This article is devoted to subharmonic functions u in the unit ball. It studies how
growth conditions on u impact on the Riesz measure associated to u. More precisely,
the growth hypotheses involve ...
Compact star cooling by means of heat waves
heat waves Compact star
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2009/6/5
Compact star cooling by means of heat waves。
Evaluation of 1-D tracer concentration profile in a small river by means of Multi-Layer Perceptron Neural Networks
1-D tracer concentration profile small river Multi-Layer Perceptron Neural Networks
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2009/5/13
The prediction of temporal concentration profiles of a transported pollutant in a river is still a subject of ongoing research efforts worldwide. The present paper is aimed at studying the possibility...
Assessing winter storm flow generation by means of permeability of the lithology and dominating runoff production processes
winter storm flow coefficients permeability of the lithology runoff production processes
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2009/5/13
In this study two approaches are used to predict winter storm flow coefficients in meso-scale basins (10 km² to 1000 km²) with a view to regionalization. The winter storm flow coefficient co...
Exploratory data analysis and clustering of multivariate spatial hydrogeological data by means of GEO3DSOM, a variant of Kohonen's Self-Organizing Map
self-organizing map Exploratory data analysis
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2009/5/8
The use of unsupervised artificial neural network techniques like the self-organizing map (SOM) algorithm has proven to be a useful tool in exploratory data analysis and clustering of multivariate dat...
Estimating the suspended sediment yield in a river network by means of geomorphic parameters and regression relationships
suspended sediment yield geomorphic parameters
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2009/4/28
An application of regression relationships depending on geomorphic parameters is proposed to predict the amount of the average annual suspended sediment yield at different sections of the drainage net...
On Certain Inequalities for Means in Two Variables
Means and their inequalities
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2010/1/22
We show that certain inequalities for the means A, G, L, I proved by H.-J. Seiffert [12] as well as by H. Alzer and S.-L. Qiu [3] are consequences of some results of the author [5], [7], [9].
Nonlinear relationships between atmospheric aerosol and its gaseous precursors：Analysis of long-term air quality monitoring data by means of neural networks
Nonlinear relationships atmospheric aerosol gaseous precursors neural networks
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2009/3/10
The nonlinear features of the relationships between concentrations of aerosol and volatile organic compounds (VOC) and nitrogen oxides (NOx) in urban environments are revealed directly from data of lo...