The issue of the stability and controller design of Takagi-Sugeno（T-S） fuzzy control systems with time-delay is investigated under imperfect premise matching when the T-S fuzzy time-delay model and fuzzy controller ...The issue of the stability and controller design of Takagi-Sugeno（T-S） fuzzy control systems with time-delay is investigated under imperfect premise matching when the T-S fuzzy time-delay model and fuzzy controller do not share the same membership functions.A new stability criterion which contains the information of membership functions is derived.The new stability criterion is less conservative,and enhances the design flexibility.Two numerical examples are presented to illustrate the conservativeness and effectiveness of the proposed method.展开更多
We have theoretically studied the modal dispersion equation and effective refractive index of one-dimensional plasma photonic crystals (1-D PPCs) having different materials in one unit cell. The dispersion relations r...We have theoretically studied the modal dispersion equation and effective refractive index of one-dimensional plasma photonic crystals (1-D PPCs) having different materials in one unit cell. The dispersion relations related for such structure is derived by solving Maxwell’s equation using the transfer matrix method. It is found that the presence of plasma in a unit cell enhanced the phase matching ability and provides additional degree of freedom to control phase matching condition compared to the conventional one-dimensional photonic crystals (1-D PCs).展开更多
Some new concepts of effective incidence matrix,ascending order adjacency matrix andend-result vertex are introduced,and some improvements of the maximum weight matchingalgorithm are made.With this method a computer p...Some new concepts of effective incidence matrix,ascending order adjacency matrix andend-result vertex are introduced,and some improvements of the maximum weight matchingalgorithm are made.With this method a computer program in FORTRAN language is realized onthe computers FELIX C-512 and IBM-PC.Good results are obtained in practical operations.展开更多
Developing a rapid and precise method for trace element analysis in geothermal water is crucial due to its high total dissolved solids and salinity,which can impact element determination.In this study,we optimized the...Developing a rapid and precise method for trace element analysis in geothermal water is crucial due to its high total dissolved solids and salinity,which can impact element determination.In this study,we optimized the determination of ferrum,manganese,strontium and barium in geothermal water samples collected from different regions.A matrix matching method was established for accurate quantification using Inductively Coupled Plasma Optical Emission Spectroscopy(ICP-OES).Instrumental conditions and experimental parameters were optimized,and the influence of storage medium and storage duration on measurement accuracy were evaluated.The results demonstrated that storing geothermal water samples in 1%nitric acid had no significant impact on measurement results over an eight-week period.Calibration curve correlation coefficients exceeded 0.9998 for all target elements.The detection limits of this method ranged from 0.0002 mg/L to 0.0031 mg/L,with Relative Standard Deviations(RSD)were 0.07%–2.33%,and spike recovery rates were from 96.8%to 103.2%.The obtained data were consistent with results from the standard addition method and dilution method,demonstrating the reliability of this approach.This method offers low detection limits,high precision and excellent recovery rate,providing a robust reference for the accurate determination of ferrum,manganese,strontium and barium in geothermal water,thereby laying a solid foundation for the development and utilization of geothermal resources.展开更多
In order to resolve the problem of surface match in the process of surface detection for aircraft thin-walled and composite parts, an efficient approach of 3D surface matching was proposed which is based on the Maximu...In order to resolve the problem of surface match in the process of surface detection for aircraft thin-walled and composite parts, an efficient approach of 3D surface matching was proposed which is based on the Maximum Independent Set （MIS） algorithm of free surface matching. First, to introduce the MIS, this paper described the approach in detail. The MIS of matching points was finally solved by converting the surface matching into a sur- face matching of discrete points, establishing the distance matrix of discrete points, and constructing a 0-1 matrix using the error radius. Second, a validation case was used to show that the algorithm demonstrates good overall local and global surface matching efficiency.展开更多
基金Supported by the National Natural Science Foundation of China(60874084)the Academy of Finland(135225,127299)
文摘The issue of the stability and controller design of Takagi-Sugeno（T-S） fuzzy control systems with time-delay is investigated under imperfect premise matching when the T-S fuzzy time-delay model and fuzzy controller do not share the same membership functions.A new stability criterion which contains the information of membership functions is derived.The new stability criterion is less conservative,and enhances the design flexibility.Two numerical examples are presented to illustrate the conservativeness and effectiveness of the proposed method.
文摘We have theoretically studied the modal dispersion equation and effective refractive index of one-dimensional plasma photonic crystals (1-D PPCs) having different materials in one unit cell. The dispersion relations related for such structure is derived by solving Maxwell’s equation using the transfer matrix method. It is found that the presence of plasma in a unit cell enhanced the phase matching ability and provides additional degree of freedom to control phase matching condition compared to the conventional one-dimensional photonic crystals (1-D PCs).
文摘Some new concepts of effective incidence matrix,ascending order adjacency matrix andend-result vertex are introduced,and some improvements of the maximum weight matchingalgorithm are made.With this method a computer program in FORTRAN language is realized onthe computers FELIX C-512 and IBM-PC.Good results are obtained in practical operations.
基金supported jointly by National Natural Science Foundation of China(NO.42430718)National Natural Science Foundation of China(NO.42077179)+2 种基金Natural Science Foundation of Fujian Province of China(NO.2023J01227)Natural Science Foundation of Xiamen,China(NO.3502Z20227309)Basic Scientific Research Business Expenses Project of the Chinese Academy of Geological Sciences(NO.YK202303).
文摘Developing a rapid and precise method for trace element analysis in geothermal water is crucial due to its high total dissolved solids and salinity,which can impact element determination.In this study,we optimized the determination of ferrum,manganese,strontium and barium in geothermal water samples collected from different regions.A matrix matching method was established for accurate quantification using Inductively Coupled Plasma Optical Emission Spectroscopy(ICP-OES).Instrumental conditions and experimental parameters were optimized,and the influence of storage medium and storage duration on measurement accuracy were evaluated.The results demonstrated that storing geothermal water samples in 1%nitric acid had no significant impact on measurement results over an eight-week period.Calibration curve correlation coefficients exceeded 0.9998 for all target elements.The detection limits of this method ranged from 0.0002 mg/L to 0.0031 mg/L,with Relative Standard Deviations(RSD)were 0.07%–2.33%,and spike recovery rates were from 96.8%to 103.2%.The obtained data were consistent with results from the standard addition method and dilution method,demonstrating the reliability of this approach.This method offers low detection limits,high precision and excellent recovery rate,providing a robust reference for the accurate determination of ferrum,manganese,strontium and barium in geothermal water,thereby laying a solid foundation for the development and utilization of geothermal resources.
文摘In order to resolve the problem of surface match in the process of surface detection for aircraft thin-walled and composite parts, an efficient approach of 3D surface matching was proposed which is based on the Maximum Independent Set （MIS） algorithm of free surface matching. First, to introduce the MIS, this paper described the approach in detail. The MIS of matching points was finally solved by converting the surface matching into a sur- face matching of discrete points, establishing the distance matrix of discrete points, and constructing a 0-1 matrix using the error radius. Second, a validation case was used to show that the algorithm demonstrates good overall local and global surface matching efficiency.
