The LIBS （Laser induced-breakdown spectroscopy） combined with BPNN （Back propagation neural network） was applied in rock sorting and distinguishing for 26 rock samples of 6 types. According to contents of major el...The LIBS （Laser induced-breakdown spectroscopy） combined with BPNN （Back propagation neural network） was applied in rock sorting and distinguishing for 26 rock samples of 6 types. According to contents of major elements in samples, we selected lines of Si, Al, Fe, K, Ca, Mg, Na, Ti and Mn. These lines of 9 elements composed three characteristic spectral models which were the WSLM （Wide spectral line model）, the PM （Peak model） and the PRM （Peak ratio model）. The first and the second characteristic spectral model were divided into 9 kinds, as follows： the characteristic spectrum with 1 element, the characteristic spectrum with 2 elements, we can deduce the rest from this and the last one has 9 elements. The third model was divided into 8 kinds which were using AI as reference element. We analysed spectrums of the three models by BPNN. Experimental results shown that whether sorting or distinguishing these samples, identification accuracies of the PM were more than that of the PRM overall, the same as the WSLM did to the PM. While the selected number of elements was 5, 6 or 7, the identification accuracy of the WSLM could reach more than 90%. Continuing to add the number of elements to improve identification accuracy was not very obvious.展开更多
Mixing processes are universal in the genesis of thermal waters from Xinzhou basin. Chemical and isotopic (δD-δ18O,34S/32S,87Sr/86Sr,T) data are comprehensively used to dis cern the geochemical and hydrodynamic envi...Mixing processes are universal in the genesis of thermal waters from Xinzhou basin. Chemical and isotopic (δD-δ18O,34S/32S,87Sr/86Sr,T) data are comprehensively used to dis cern the geochemical and hydrodynamic environments of these waters. Based on a two-year hydrochemical monitoring on thermal waters from the well XD1 in Duncun geothermal field . a series of changes in quality have been observed , which are attributed to the change in the proportion of end members making up the thermal waters being withdrawn .展开更多
文摘The LIBS （Laser induced-breakdown spectroscopy） combined with BPNN （Back propagation neural network） was applied in rock sorting and distinguishing for 26 rock samples of 6 types. According to contents of major elements in samples, we selected lines of Si, Al, Fe, K, Ca, Mg, Na, Ti and Mn. These lines of 9 elements composed three characteristic spectral models which were the WSLM （Wide spectral line model）, the PM （Peak model） and the PRM （Peak ratio model）. The first and the second characteristic spectral model were divided into 9 kinds, as follows： the characteristic spectrum with 1 element, the characteristic spectrum with 2 elements, we can deduce the rest from this and the last one has 9 elements. The third model was divided into 8 kinds which were using AI as reference element. We analysed spectrums of the three models by BPNN. Experimental results shown that whether sorting or distinguishing these samples, identification accuracies of the PM were more than that of the PRM overall, the same as the WSLM did to the PM. While the selected number of elements was 5, 6 or 7, the identification accuracy of the WSLM could reach more than 90%. Continuing to add the number of elements to improve identification accuracy was not very obvious.
基金The research is supported by the IET Education Foundation
文摘Mixing processes are universal in the genesis of thermal waters from Xinzhou basin. Chemical and isotopic (δD-δ18O,34S/32S,87Sr/86Sr,T) data are comprehensively used to dis cern the geochemical and hydrodynamic environments of these waters. Based on a two-year hydrochemical monitoring on thermal waters from the well XD1 in Duncun geothermal field . a series of changes in quality have been observed , which are attributed to the change in the proportion of end members making up the thermal waters being withdrawn .
