期刊文献+
共找到4篇文章
< 1 >
每页显示 20 50 100
关于随机矩阵的一点注记
1
作者 杜吉佩 杨尚骏 《沈阳建筑工程学院学报》 1993年第2期204-207,共4页
对于 m×n(m≥n)非负(列随机)矩阵.如果存在 n×n 双(行)次随机矩阵 X,Y 满足 A=BX 和 B=AY,则有置换矩阵 P,使A=BP 成立.
关键词 极端列 随机矩阵 注记
下载PDF
Evaporation from Bare Soil in Extremely Arid Environment in Southern Israel 被引量:6
2
作者 WANGXUEFENG XUFUAN 《Pedosphere》 SCIE CAS CSCD 1996年第2期139-146,共8页
Microlysimeters of different sizes(5 cm 10 cm and 15 cm in length)were used extensively in the present study for the measurements of soil evapondion in site in an extremely arid area in southern Israel.All of the data... Microlysimeters of different sizes(5 cm 10 cm and 15 cm in length)were used extensively in the present study for the measurements of soil evapondion in site in an extremely arid area in southern Israel.All of the data obtained from the microlysimeters were used to evaluate two conventional eVaporation models developed by Black et al.and Ritchie,respectively.Our results indicated that the models could overestimate total cumulative evaporation by about 30% in the extremely arid environment.Reducing the power factor of the conventional model by a faCtor of 0.1 produced good agreement between the measured and simulated cumulative evaporation.Microlysimeter method proved to be a simple and accurate approach for the evaluation of soil evaporstion. 展开更多
关键词 bare soil EVAPORATION microlysimeter soil water
下载PDF
Limiting Distribution of Extreme Values for FGM Random Sequences
3
作者 ZHANG Jian ZHANG Ling 《Chinese Quarterly Journal of Mathematics》 CSCD 2010年第3期366-371,共6页
This paper mainly study extreme values of FGM random sequences.We prove a technique theorem by the dependence structure of FGM sequences,and further obtain the limiting distributions of maxima and k-th largest for sta... This paper mainly study extreme values of FGM random sequences.We prove a technique theorem by the dependence structure of FGM sequences,and further obtain the limiting distributions of maxima and k-th largest for stationary FGM random sequences. 展开更多
关键词 Farlie-Gumbel-Morgenstern random sequences MAXIMA extreme values limiting distribution
下载PDF
Homogenization of climate series:The basis for assessing climate changes 被引量:14
4
作者 YAN ZhongWei LI Zhen XIA JiangJiang 《Science China Earth Sciences》 SCIE EI CAS 2014年第12期2891-2900,共10页
Long-term meteorological observation series are fundamental for reflecting climate changes.However,almost all meteorological stations inevitably undergo relocation or changes in observation instruments,rules,and metho... Long-term meteorological observation series are fundamental for reflecting climate changes.However,almost all meteorological stations inevitably undergo relocation or changes in observation instruments,rules,and methods,which can result in systematic biases in the observation series for corresponding periods.Homogenization is a technique for adjusting these biases in order to assess the true trends in the time series.In recent years,homogenization has shifted its focus from the adjustments to climate mean status to the adjustments to information about climate extremes or extreme weather.Using case analyses of ideal and actual climate series,here we demonstrate the basic idea of homogenization,introduce new understanding obtained from recent studies of homogenization of climate series in China,and raise issues for further studies in this field,especially with regards to climate extremes,uncertainty of the statistical adjustments,and biased physical relationships among different climate variables due to adjustments in single variable series. 展开更多
关键词 climate series INHOMOGENEITY HOMOGENIZATION trends in climate series climate extremes
原文传递
上一页 1 下一页 到第
使用帮助 返回顶部