该文运用FAO 1998年出版的灌溉与排水分册第56册中对参考作物腾发量的新定义和计算公式(彭曼-蒙蒂斯公式),应用能代表山西省全部气候带的11个气象站9年(1991年至1999年)的逐日气象观测资料,通过V isua l B as ic 6.0编制程序实现计算功...该文运用FAO 1998年出版的灌溉与排水分册第56册中对参考作物腾发量的新定义和计算公式(彭曼-蒙蒂斯公式),应用能代表山西省全部气候带的11个气象站9年(1991年至1999年)的逐日气象观测资料,通过V isua l B as ic 6.0编制程序实现计算功能,利用SQL Server 2000数据库服务器存储数据,同时利用G IS软件A rcm ap9.0对山西省参考作物腾发量进行时间和空间上的分析。提出了用平均法(即用逐日参考作物腾发量值经过平均计算得到当月参考作物腾发量)计算逐月参考作物腾发量来代替用彭曼-蒙蒂斯公式计算的逐月参考作物腾发量,并可绘制出相应的日或月的参考作物腾发量等值线图。展开更多
Using geostatistical method, the semi-variation function models of tobacco mosaic virus （TMV） in east-west and north-south directions were established, and the distribution pattern of TMV in large scale space was st...Using geostatistical method, the semi-variation function models of tobacco mosaic virus （TMV） in east-west and north-south directions were established, and the distribution pattern of TMV in large scale space was studied. The results showed that the distribution pattern of the disease in east-west and north-south directions belonged to linear model with abutment, and the spatial distribution pattern within the investigated areas was aggregated model. The spatial correlation distances in east-west and north-south directions were 29.953 4 and 47.813 8 km, and the spatial variabilities were 95.71% and 80.05%, respectively. This indicated that they had strong spatial correlation. Isoline map accessed by Kringing interpolation method could clearly reflect the spatial aggregated model.展开更多
By studying different compressive strengths and changes in the characteristics of rocks,five variables were selected to predict faults in coal mines. Drillholes in the mined area were divided into two populations, i.e...By studying different compressive strengths and changes in the characteristics of rocks,five variables were selected to predict faults in coal mines. Drillholes in the mined area were divided into two populations, i.e., drillholes containing faults and drillholes without faults. Discriminant functions were established from the values of the five variables using Fisher's approach. Drillholes in the non-mined areas were allocated to one of the two populations by using discriminant functions. The terrenes of each drillhole were divided into 10 sections, above and below a minable coal seam. Each section has 10 layers of rocks. The population to which each drillhole in a section belongs is sorted out and the probability of each drillhole with faults obtained,i.e., a contour map of predicting the probability of faults in coal mining is shown. A comparison with the real distribution of faults shows that the precision of accurately predicting faults is greater than 70 per cent.展开更多
文摘该文运用FAO 1998年出版的灌溉与排水分册第56册中对参考作物腾发量的新定义和计算公式(彭曼-蒙蒂斯公式),应用能代表山西省全部气候带的11个气象站9年(1991年至1999年)的逐日气象观测资料,通过V isua l B as ic 6.0编制程序实现计算功能,利用SQL Server 2000数据库服务器存储数据,同时利用G IS软件A rcm ap9.0对山西省参考作物腾发量进行时间和空间上的分析。提出了用平均法(即用逐日参考作物腾发量值经过平均计算得到当月参考作物腾发量)计算逐月参考作物腾发量来代替用彭曼-蒙蒂斯公式计算的逐月参考作物腾发量,并可绘制出相应的日或月的参考作物腾发量等值线图。
基金Supported by Modern Tobacco Agriculture-Project of Dingzhai Base Unit
文摘Using geostatistical method, the semi-variation function models of tobacco mosaic virus （TMV） in east-west and north-south directions were established, and the distribution pattern of TMV in large scale space was studied. The results showed that the distribution pattern of the disease in east-west and north-south directions belonged to linear model with abutment, and the spatial distribution pattern within the investigated areas was aggregated model. The spatial correlation distances in east-west and north-south directions were 29.953 4 and 47.813 8 km, and the spatial variabilities were 95.71% and 80.05%, respectively. This indicated that they had strong spatial correlation. Isoline map accessed by Kringing interpolation method could clearly reflect the spatial aggregated model.
基金Project 40772198 supported by the National Natural Science Foundation of China
文摘By studying different compressive strengths and changes in the characteristics of rocks,five variables were selected to predict faults in coal mines. Drillholes in the mined area were divided into two populations, i.e., drillholes containing faults and drillholes without faults. Discriminant functions were established from the values of the five variables using Fisher's approach. Drillholes in the non-mined areas were allocated to one of the two populations by using discriminant functions. The terrenes of each drillhole were divided into 10 sections, above and below a minable coal seam. Each section has 10 layers of rocks. The population to which each drillhole in a section belongs is sorted out and the probability of each drillhole with faults obtained,i.e., a contour map of predicting the probability of faults in coal mining is shown. A comparison with the real distribution of faults shows that the precision of accurately predicting faults is greater than 70 per cent.
