Coal mining under buildings certainly causes surface movement and deformation, therefore, it brings about deformation even fracture for buildings. It is an important task to evaluate correcly the buildings’ damage gr...Coal mining under buildings certainly causes surface movement and deformation, therefore, it brings about deformation even fracture for buildings. It is an important task to evaluate correcly the buildings’ damage grabe caused by coal mining. Fuzzy comprehensive evaluation,considering some factors of buildings’ fracture, has been applied to analyze the masonry structure buildings’ damage grade affer coal mining in this paper. It provides a scientific basis for buildings’reidercement before mining and maintenance or compensation after mining.展开更多
Fresh Lycium barbarum L.(L.barbarum)fruits are renowned for their exceptionally high nutritional value and health benefits,which is leading to an increasing demand among consumers.However,the quality testing and gradi...Fresh Lycium barbarum L.(L.barbarum)fruits are renowned for their exceptionally high nutritional value and health benefits,which is leading to an increasing demand among consumers.However,the quality testing and grading of fresh L.barbarum fruits present significant challenges that hinder the growth of the L.barbarum industry.In this study,an electrical characterization method is used to analyze the variations in electrical parameters of fresh L.barbarum fruits under different degrees of damage.Optimal testing conditions for eight electrical parameters are determined,and principal component analysis(PCA)along with partial least squares(PLS)is applied to reduce data dimensionality and extract key features.Subsequently,damage degree discrimination models are developed using the support vector machine(SVM),random forest(RF),and convolutional neural network(CNN).The experimental results indicate that the PLS-RF model was the most effective,achieving discrimination accuracies of 99.48%and 91.25%in the training and test sets,respectively.The aim of this study is to validate the feasibility of using electrical characteristics to differentiate the degree of fruit damage and it establishes a reliable model for assessing damage extent in L.barbarum fruits.This innovative approach not only provides a novel method for evaluating fruit damage but may also serve as a theoretical basis for the development of mechanical harvesting equipment for L.barbarum fruits.展开更多
Seismologists have begun to investigate the earthquake damage and assess the economic losses on the spot in the Yunnan area since the earthquakes with M_S6.7 and M_S6.9 that occurred on the boundary between China and ...Seismologists have begun to investigate the earthquake damage and assess the economic losses on the spot in the Yunnan area since the earthquakes with M_S6.7 and M_S6.9 that occurred on the boundary between China and Myanmar west of Menglian county,Yunnan Province,on April 23,1992.From 1992 to 2003,50 destructive earthquakes occurred in Yunnan,and large amounts of data on seismic hazard have been accumulated.With focus on the major building structures,the paper makes statistical analysis on the earthquake damage ratio,loss ratio and seismic hazard index in the areas with different seismic intensity of the 50 events,and presents the seismic hazard matrix of buildings for the Yunnan area.展开更多
文摘Coal mining under buildings certainly causes surface movement and deformation, therefore, it brings about deformation even fracture for buildings. It is an important task to evaluate correcly the buildings’ damage grabe caused by coal mining. Fuzzy comprehensive evaluation,considering some factors of buildings’ fracture, has been applied to analyze the masonry structure buildings’ damage grade affer coal mining in this paper. It provides a scientific basis for buildings’reidercement before mining and maintenance or compensation after mining.
基金supported by the Autonomous Region Key Research and Development Plan Project[Grant No.2022BSB03064]the National Key Research and Development Program of China[grant number 2022YFD2202105-5]+1 种基金the National Natural Science Foundation of China[grant number 32260431]Science and Technology Major Projects of Autonomous Region[grant number 2022BBF01002].
文摘Fresh Lycium barbarum L.(L.barbarum)fruits are renowned for their exceptionally high nutritional value and health benefits,which is leading to an increasing demand among consumers.However,the quality testing and grading of fresh L.barbarum fruits present significant challenges that hinder the growth of the L.barbarum industry.In this study,an electrical characterization method is used to analyze the variations in electrical parameters of fresh L.barbarum fruits under different degrees of damage.Optimal testing conditions for eight electrical parameters are determined,and principal component analysis(PCA)along with partial least squares(PLS)is applied to reduce data dimensionality and extract key features.Subsequently,damage degree discrimination models are developed using the support vector machine(SVM),random forest(RF),and convolutional neural network(CNN).The experimental results indicate that the PLS-RF model was the most effective,achieving discrimination accuracies of 99.48%and 91.25%in the training and test sets,respectively.The aim of this study is to validate the feasibility of using electrical characteristics to differentiate the degree of fruit damage and it establishes a reliable model for assessing damage extent in L.barbarum fruits.This innovative approach not only provides a novel method for evaluating fruit damage but may also serve as a theoretical basis for the development of mechanical harvesting equipment for L.barbarum fruits.
基金This project was sponsored by the provincial tenth"Five-Year Plan"(Yunnan Provincial Plan2002-54-02-02),China
文摘Seismologists have begun to investigate the earthquake damage and assess the economic losses on the spot in the Yunnan area since the earthquakes with M_S6.7 and M_S6.9 that occurred on the boundary between China and Myanmar west of Menglian county,Yunnan Province,on April 23,1992.From 1992 to 2003,50 destructive earthquakes occurred in Yunnan,and large amounts of data on seismic hazard have been accumulated.With focus on the major building structures,the paper makes statistical analysis on the earthquake damage ratio,loss ratio and seismic hazard index in the areas with different seismic intensity of the 50 events,and presents the seismic hazard matrix of buildings for the Yunnan area.
