In this study, an intelligent monitoring platform is established for continuous quantification of soil,vegetation, and atmosphere parameters (e.g. soil suction, rainfall, tree canopy, air temperature, and windspeed) t...In this study, an intelligent monitoring platform is established for continuous quantification of soil,vegetation, and atmosphere parameters (e.g. soil suction, rainfall, tree canopy, air temperature, and windspeed) to provide an efficient dataset for modeling suction response through machine learning. Twocharacteristic parameters representing suction response during wetting processes, i.e. response time andmean reduction rate of suction, are formulated through multi-gene genetic programming (MGGP) usingeight selected influential parameters including depth, initial soil suction, vegetation- and atmosphererelated parameters. An error standardebased performance evaluation indicated that MGGP has appreciable potential for model development when working with even fewer than 100 data. Global sensitivityanalysis revealed the importance of tree canopy and mean wind speed to estimation of response timeand indicated that initial soil suction and rainfall amount have an important effect on the estimatedsuction reduction rate during a wetting process. Uncertainty assessment indicated that the two MGGPmodels describing suction response after rainfall are reliable and robust under uncertain conditions. Indepth analysis of spatial variations in suction response validated the robustness of two obtained MGGPmodels in prediction of suction variation characteristics under natural conditions.展开更多
Based on the variational prineiple of incomplete generalized potential energy with large deflection, the vertical nonlinear vibrational differential equation of self-anchored suspension bridge is presented by taking t...Based on the variational prineiple of incomplete generalized potential energy with large deflection, the vertical nonlinear vibrational differential equation of self-anchored suspension bridge is presented by taking the effect of coupling of flexural and axial action into consideration. The linear vertical equation is obtained by omitting the nonlinear term, and the pseudo excitation method(PEM). Taking the self-anchored concrete suspension bridge over Lanqi Songhua river for an example, the expected peak responses of main beam, towers and cables are calculated. And the seismic spatial effects on vertical seismic response of self-anchored suspension bridges are discussed.展开更多
Frequency-invariant beamformer （FIB） design is a key issue in wideband array signal processing. To use commonly wideband linear array with tapped delay line （TDL） structure and complex weights, the FIB design is p...Frequency-invariant beamformer （FIB） design is a key issue in wideband array signal processing. To use commonly wideband linear array with tapped delay line （TDL） structure and complex weights, the FIB design is provided according to the rule of minimizing the sidelobe level of the beampattern at the reference frequency while keeping the distortionless response constraint in the mainlobe direction at the reference frequency, the norm constraint of the weight vector and the amplitude constraint of the averaged spatial response variation （SRV）. This kind of beamformer design problem can be solved with the interior-point method after being converted to the form of standard second order cone programming （SOCP）. The computer simulations are presented which illustrate the effectiveness of our FIB design method for the wideband linear array with TDL structure and complex weights.展开更多
运用紫外-可见分光光度法测定4个产区药用植物太子参(Pseudostellaria heterophylla(Miq.)Pax ex Pax et Hoffm.)中的太子参皂苷含量,并分析太子参皂苷含量的地理变异规律,及其与气候因子在不同时间尺度上的响应关系。结果显示,太子参...运用紫外-可见分光光度法测定4个产区药用植物太子参(Pseudostellaria heterophylla(Miq.)Pax ex Pax et Hoffm.)中的太子参皂苷含量,并分析太子参皂苷含量的地理变异规律,及其与气候因子在不同时间尺度上的响应关系。结果显示,太子参皂苷含量可分为江苏-安徽高含量区和贵州-福建低含量区。太子参皂苷含量与年均日照量呈极显著正相关,与年均相对湿度和年均降水呈负相关;与最热月份最高温呈显著正相关,与最冷季度平均温呈显著负相关。月均日照量和月均温对太子参皂苷含量影响较大,其中1-12月的月均日照量与太子参皂苷含量呈显著正相关;1-4月和11-12月的月均温与太子参皂苷含量呈负相关;5-9月的月均温与太子参皂苷含量呈正相关。产区间日照量差异可能是造成太子参皂苷含量地理变异的主要气候因素,日照量高、季度间温度差异大且相对少雨、低湿的地区有助于太子参皂苷的形成和积累。展开更多
基金the financial support funded by the Science and Technology Development Fund of Macao SAR (Grant Nos. 0026/2020/AFJ and SKL-IOTSC(UM)-2021-2023)the Funds for University of Macao (Grant No. MYRG2018-00173-FST)
文摘In this study, an intelligent monitoring platform is established for continuous quantification of soil,vegetation, and atmosphere parameters (e.g. soil suction, rainfall, tree canopy, air temperature, and windspeed) to provide an efficient dataset for modeling suction response through machine learning. Twocharacteristic parameters representing suction response during wetting processes, i.e. response time andmean reduction rate of suction, are formulated through multi-gene genetic programming (MGGP) usingeight selected influential parameters including depth, initial soil suction, vegetation- and atmosphererelated parameters. An error standardebased performance evaluation indicated that MGGP has appreciable potential for model development when working with even fewer than 100 data. Global sensitivityanalysis revealed the importance of tree canopy and mean wind speed to estimation of response timeand indicated that initial soil suction and rainfall amount have an important effect on the estimatedsuction reduction rate during a wetting process. Uncertainty assessment indicated that the two MGGPmodels describing suction response after rainfall are reliable and robust under uncertain conditions. Indepth analysis of spatial variations in suction response validated the robustness of two obtained MGGPmodels in prediction of suction variation characteristics under natural conditions.
文摘Based on the variational prineiple of incomplete generalized potential energy with large deflection, the vertical nonlinear vibrational differential equation of self-anchored suspension bridge is presented by taking the effect of coupling of flexural and axial action into consideration. The linear vertical equation is obtained by omitting the nonlinear term, and the pseudo excitation method(PEM). Taking the self-anchored concrete suspension bridge over Lanqi Songhua river for an example, the expected peak responses of main beam, towers and cables are calculated. And the seismic spatial effects on vertical seismic response of self-anchored suspension bridges are discussed.
基金supported by the President Award of Chinese Academy of Sciences (O729031511)
文摘Frequency-invariant beamformer （FIB） design is a key issue in wideband array signal processing. To use commonly wideband linear array with tapped delay line （TDL） structure and complex weights, the FIB design is provided according to the rule of minimizing the sidelobe level of the beampattern at the reference frequency while keeping the distortionless response constraint in the mainlobe direction at the reference frequency, the norm constraint of the weight vector and the amplitude constraint of the averaged spatial response variation （SRV）. This kind of beamformer design problem can be solved with the interior-point method after being converted to the form of standard second order cone programming （SOCP）. The computer simulations are presented which illustrate the effectiveness of our FIB design method for the wideband linear array with TDL structure and complex weights.
文摘运用紫外-可见分光光度法测定4个产区药用植物太子参(Pseudostellaria heterophylla(Miq.)Pax ex Pax et Hoffm.)中的太子参皂苷含量,并分析太子参皂苷含量的地理变异规律,及其与气候因子在不同时间尺度上的响应关系。结果显示,太子参皂苷含量可分为江苏-安徽高含量区和贵州-福建低含量区。太子参皂苷含量与年均日照量呈极显著正相关,与年均相对湿度和年均降水呈负相关;与最热月份最高温呈显著正相关,与最冷季度平均温呈显著负相关。月均日照量和月均温对太子参皂苷含量影响较大,其中1-12月的月均日照量与太子参皂苷含量呈显著正相关;1-4月和11-12月的月均温与太子参皂苷含量呈负相关;5-9月的月均温与太子参皂苷含量呈正相关。产区间日照量差异可能是造成太子参皂苷含量地理变异的主要气候因素,日照量高、季度间温度差异大且相对少雨、低湿的地区有助于太子参皂苷的形成和积累。
