Accurate characterization of soil properties such as soil water content(SWC)and bulk density(BD)is vital for hydrologic processes and thus,it is importance to estimateθ(water content)andρ(soil bulk density)among oth...Accurate characterization of soil properties such as soil water content(SWC)and bulk density(BD)is vital for hydrologic processes and thus,it is importance to estimateθ(water content)andρ(soil bulk density)among other soil surface parameters involved in water retention and infiltration,runoff generation and water erosion,etc.The spatial estimation of these soil properties are important in guiding agricultural management decisions.These soil properties vary both in space and time and are correlated.Therefore,it is important to find an efficient and robust technique to simulate spatially correlated variables.Methods such as principal component analysis(PCA)and independent component analysis(ICA)can be used for the joint simulations of spatially correlated variables,but they are not without their flaws.This study applied a variant of PCA called independent principal component analysis(IPCA)that combines the strengths of both PCA and ICA for spatial simulation of SWC and BD using the soil data set from an 11 km^(2) Castor watershed in southern Quebec,Canada.Diagnostic checks using the histograms and cumulative distribution function(cdf)both raw and back transformed simulations show good agreement.Therefore,the results from this study has potential in characterization of water content variability and bulk density variation for precision agriculture.展开更多
There is growing interest in utilizing the beam position monitor turn-by-turn（TBT） data to debug accelerators. TBT data can be used to determine the linear optics,coupled optics and nonlinear behaviors of the storag...There is growing interest in utilizing the beam position monitor turn-by-turn（TBT） data to debug accelerators. TBT data can be used to determine the linear optics,coupled optics and nonlinear behaviors of the storage ring lattice. This is not only a useful complement to other methods of determining the linear optics such as LOCO,but also provides a possibility to uncover more hidden phenomena. In this paper,a preliminary application of a β function measurement to the SSRF storage ring is presented.展开更多
基金We thank the two anonymous reviewers for their useful suggestions which help improved this paper.This study was funded by the Brace Water Management Center,McGill University,Macdonald campus,Sainte-Anne-de-Bellevue,Quebec,Canada.We thank Helen Lelande and Dr.Kebba Sabally for the laboratory analysis of the soil samples.We appreciate all the summer students who participated in the field and laboratory analysis of the soil samples.
文摘Accurate characterization of soil properties such as soil water content(SWC)and bulk density(BD)is vital for hydrologic processes and thus,it is importance to estimateθ(water content)andρ(soil bulk density)among other soil surface parameters involved in water retention and infiltration,runoff generation and water erosion,etc.The spatial estimation of these soil properties are important in guiding agricultural management decisions.These soil properties vary both in space and time and are correlated.Therefore,it is important to find an efficient and robust technique to simulate spatially correlated variables.Methods such as principal component analysis(PCA)and independent component analysis(ICA)can be used for the joint simulations of spatially correlated variables,but they are not without their flaws.This study applied a variant of PCA called independent principal component analysis(IPCA)that combines the strengths of both PCA and ICA for spatial simulation of SWC and BD using the soil data set from an 11 km^(2) Castor watershed in southern Quebec,Canada.Diagnostic checks using the histograms and cumulative distribution function(cdf)both raw and back transformed simulations show good agreement.Therefore,the results from this study has potential in characterization of water content variability and bulk density variation for precision agriculture.
文摘There is growing interest in utilizing the beam position monitor turn-by-turn（TBT） data to debug accelerators. TBT data can be used to determine the linear optics,coupled optics and nonlinear behaviors of the storage ring lattice. This is not only a useful complement to other methods of determining the linear optics such as LOCO,but also provides a possibility to uncover more hidden phenomena. In this paper,a preliminary application of a β function measurement to the SSRF storage ring is presented.
