We propose a method for estimating the mutual coupling coefficient among antennas in this paper which is based on the principle of signal subspace and the simulated annealing （SA） algorithm. The computer simulation ...We propose a method for estimating the mutual coupling coefficient among antennas in this paper which is based on the principle of signal subspace and the simulated annealing （SA） algorithm. The computer simulation has been conducted to illustrate the＇ excellent performance of this method and to demonstrate that it is statistically efficient. The benefit of this new method is that calibration signals and unknown signals can be received simultaneously, during the course of calibration.展开更多
The low-energy mutual neutralization(MN)reactions Na^(+)+H^(-)→Na(nl)+H have been studied by employing the full quantum-mechanical molecular-orbital close-coupling(QMOCC)method over a wide energy range of 10^(-3)-10^...The low-energy mutual neutralization(MN)reactions Na^(+)+H^(-)→Na(nl)+H have been studied by employing the full quantum-mechanical molecular-orbital close-coupling(QMOCC)method over a wide energy range of 10^(-3)-10^(3) e V/u.Total and state-selective cross sections have been investigated and compared with the available theoretical and experimental data,and the state-selective rate coefficients for the temperature range of 100-10000 K have been obtained.In the present work,all the necessary highly excited states are included,and the influences of rotational couplings and 10 active electrons are considered.It is found that in the energy below 10 e V/u,the Na(4s)state is the most dominant exit state with a contribution of approximately 78%to the branch fraction,which is in best agreement with the experimental data.For energies above 10 e V/u,the MN total cross section is larger than those obtained in other theoretical calculations and shows a slow decreasing trend because the main exit states change,when the energy is above 100 e V/u,the dominant exit state becomes the Na(3p)state,while the Na(4s)state becomes the third most important exit state.The datasets presented in this paper,including the potential energy curve,the radial and rotational couplings,the total and state-selective cross sections,are openly available at https://doi.org/10.57760/sciencedb.j00113.00112.展开更多
为探究非规则颗粒级配分布对杂填土地基互嵌沉降的影响,借助自主研制的杂填土与软土互嵌试验仪,通过室内试验分析杂填土地基试样的互嵌沉降和软土固结沉降,研究级配不同的3种杂填土地基试样在不同上覆荷载(50、100、150 k Pa)作用下的...为探究非规则颗粒级配分布对杂填土地基互嵌沉降的影响,借助自主研制的杂填土与软土互嵌试验仪,通过室内试验分析杂填土地基试样的互嵌沉降和软土固结沉降,研究级配不同的3种杂填土地基试样在不同上覆荷载(50、100、150 k Pa)作用下的总沉降、互嵌沉降的发展规律及互嵌沉降和总沉降之间的关系,探究曲率系数和上覆荷载变化对杂填土地基试样稳定沉降量的影响.试验结果表明:级配不同的3种杂填土地基试样的总沉降和互嵌沉降时程曲线均可划分为线性增长、缓慢上升、趋于稳定3个阶段.互嵌沉降是杂填土地基试样沉降的主要组成部分,特别是在互嵌发展的初期.当上覆荷载较小(50 kPa)时,杂填土地基试样的稳定沉降量随杂填土曲率系数的增大先增大后减小;当上覆荷载较大(100 k Pa和150 kPa)时,杂填土地基试样的稳定沉降量随杂填土曲率系数的增大先减小后增大.展开更多
基金Supported by the 863 High Technology Project ofChina (2001AA631050)
文摘We propose a method for estimating the mutual coupling coefficient among antennas in this paper which is based on the principle of signal subspace and the simulated annealing （SA） algorithm. The computer simulation has been conducted to illustrate the＇ excellent performance of this method and to demonstrate that it is statistically efficient. The benefit of this new method is that calibration signals and unknown signals can be received simultaneously, during the course of calibration.
基金Project supported by the National Natural Science Foundation of China(Grant Nos.12204288,11934004,and 12203106)。
文摘The low-energy mutual neutralization(MN)reactions Na^(+)+H^(-)→Na(nl)+H have been studied by employing the full quantum-mechanical molecular-orbital close-coupling(QMOCC)method over a wide energy range of 10^(-3)-10^(3) e V/u.Total and state-selective cross sections have been investigated and compared with the available theoretical and experimental data,and the state-selective rate coefficients for the temperature range of 100-10000 K have been obtained.In the present work,all the necessary highly excited states are included,and the influences of rotational couplings and 10 active electrons are considered.It is found that in the energy below 10 e V/u,the Na(4s)state is the most dominant exit state with a contribution of approximately 78%to the branch fraction,which is in best agreement with the experimental data.For energies above 10 e V/u,the MN total cross section is larger than those obtained in other theoretical calculations and shows a slow decreasing trend because the main exit states change,when the energy is above 100 e V/u,the dominant exit state becomes the Na(3p)state,while the Na(4s)state becomes the third most important exit state.The datasets presented in this paper,including the potential energy curve,the radial and rotational couplings,the total and state-selective cross sections,are openly available at https://doi.org/10.57760/sciencedb.j00113.00112.
文摘为探究非规则颗粒级配分布对杂填土地基互嵌沉降的影响,借助自主研制的杂填土与软土互嵌试验仪,通过室内试验分析杂填土地基试样的互嵌沉降和软土固结沉降,研究级配不同的3种杂填土地基试样在不同上覆荷载(50、100、150 k Pa)作用下的总沉降、互嵌沉降的发展规律及互嵌沉降和总沉降之间的关系,探究曲率系数和上覆荷载变化对杂填土地基试样稳定沉降量的影响.试验结果表明:级配不同的3种杂填土地基试样的总沉降和互嵌沉降时程曲线均可划分为线性增长、缓慢上升、趋于稳定3个阶段.互嵌沉降是杂填土地基试样沉降的主要组成部分,特别是在互嵌发展的初期.当上覆荷载较小(50 kPa)时,杂填土地基试样的稳定沉降量随杂填土曲率系数的增大先增大后减小;当上覆荷载较大(100 k Pa和150 kPa)时,杂填土地基试样的稳定沉降量随杂填土曲率系数的增大先减小后增大.
