Inspired by the profoundly observed odd-even staggering and the inverted parabolic-like shape in charge radii along calcium isotopic chain,the ground state properties of calcium isotopes are investigated by constraini...Inspired by the profoundly observed odd-even staggering and the inverted parabolic-like shape in charge radii along calcium isotopic chain,the ground state properties of calcium isotopes are investigated by constraining the root-mean-square charge radii under the covariant energy density functionals with effective forces NL3 and PK1.In this work,the pairing correlations are tackled by solving the state-dependent Bardeen-Cooper-Schrieffer equations.The calculated results suggest that the binding energies obtained by the radius constraint method have been slightly changed by about 0.2%.But for charge radii,the corresponding results deriving from NL3 and PK1 forces have been increased by about 1.0%and 2.0%,respectively.This means that the charge radius is a more sensitive quantity in the calibrated protocol.Meanwhile,it is found that the reproduced charge radii of calcium isotopes are attributed to the rather strong isospin dependence of effective potential.The odd-even oscillation behavior can also be presented in the proton Fermi energies along calcium isotopic family,but keep opposite trends with respect to the corresponding binding energies and charge radii.As encountered in charge radii,the weakened odd-even oscillation behavior still emerged from the proton Fermi energies at the neutron numbers N=20 and 28 as well,but not in binding energies.展开更多
为了进一步解决基于电容-二极管(capacitance-diode,CD)升压单元的两相交错并联Boost高增益变换器存在的开关管数量多、输入输出不共地问题,提出了一种基于CD单元的新型3L型两相交错并联Boost变换器拓扑的构建方法,并根据在第3个升压电...为了进一步解决基于电容-二极管(capacitance-diode,CD)升压单元的两相交错并联Boost高增益变换器存在的开关管数量多、输入输出不共地问题,提出了一种基于CD单元的新型3L型两相交错并联Boost变换器拓扑的构建方法,并根据在第3个升压电感前级和后级引入CD单元数量的不同,推演出基于FN-BMCD单元的3L型高增益Boost变换器的演化规律;以F2-B1CD单元的3L型Boost变换器为例,详细分析了5个开关模态的工作原理,揭示了各电感及电容寄生参数对电压增益的影响机理;搭建由数字信号处理(digital signal processing,DSP)芯片和实时仿真机组成的控制在环半实物仿真实验平台,验证了所提新型变换器拓扑理论分析的正确性。展开更多
为解决排施粉状生物炭时易出现架空、无法有效排出等问题,设计错排叶轮式排肥器。通过构建排肥器充肥和排肥过程的力学模型确定影响排肥量的主要因素,利用离散元法(discrete element method,EDEM)对排肥过程进行仿真,以排肥量为评价指标...为解决排施粉状生物炭时易出现架空、无法有效排出等问题,设计错排叶轮式排肥器。通过构建排肥器充肥和排肥过程的力学模型确定影响排肥量的主要因素,利用离散元法(discrete element method,EDEM)对排肥过程进行仿真,以排肥量为评价指标,以凹槽数目、有效工作长度和转速为影响因素,进行3因素3水平Box-Behnken试验。结果表明,试验因素对排肥量的影响表现为转速>凹槽数目>有效工作长度,转速对排肥量有极显著影响,凹槽数目对排肥量有显著影响;最佳结构参数组合为凹槽数目7、有效工作长度50 mm、转速62 r·min^(-1),在此组合下排肥量为33.132 g·s^(-1)。为检验结构参数对错排叶轮式排肥器排肥量影响的仿真试验结果,进行最优结构参数组合下的台架试验,结果表明,台架试验排肥量为33.934 g·s^(-1),与仿真结果相对误差为2.36%,仿真试验结果和台架试验结果基本吻合。研究结果为施加粉状肥料提供理论参考。展开更多
基金supported by the Natural Science Foundation of Ningxia Province,China(No.2024AAC03015)the Open Project of Guangxi Key Laboratory of Nuclear Physics and Nuclear Technology,No.NLK2023-05+9 种基金the Central Government Guidance Funds for Local Scientific and Technological Development,China(No.Guike ZY22096024)the Key Laboratory of Beam Technology of Ministry of Education,China(No.BEAM2024G04)the National Natural Science Foundation of China under Grants No.11705118,No.12175151the Major Project of the GuangDong Basic and Applied Basic Research Foundation(2021B0301030006)NT is grateful for the support of the key research and development project of Ningxia(Grant No.2024BEH04090)the Key Laboratory of Beam Technology of Ministry of Education,China(No.BEAM2024G05)the National Natural Science Foundation of China under Grants No.12275025,No.11975096the Fundamental Research Funds for the Central Universities(2020NTST06)supported by the National Key R&D Program of China under Grant No.2023YFA1606401the National Natural Science Foundation of China under Grants No.12135004,No.11635003,No.11961141004.
文摘Inspired by the profoundly observed odd-even staggering and the inverted parabolic-like shape in charge radii along calcium isotopic chain,the ground state properties of calcium isotopes are investigated by constraining the root-mean-square charge radii under the covariant energy density functionals with effective forces NL3 and PK1.In this work,the pairing correlations are tackled by solving the state-dependent Bardeen-Cooper-Schrieffer equations.The calculated results suggest that the binding energies obtained by the radius constraint method have been slightly changed by about 0.2%.But for charge radii,the corresponding results deriving from NL3 and PK1 forces have been increased by about 1.0%and 2.0%,respectively.This means that the charge radius is a more sensitive quantity in the calibrated protocol.Meanwhile,it is found that the reproduced charge radii of calcium isotopes are attributed to the rather strong isospin dependence of effective potential.The odd-even oscillation behavior can also be presented in the proton Fermi energies along calcium isotopic family,but keep opposite trends with respect to the corresponding binding energies and charge radii.As encountered in charge radii,the weakened odd-even oscillation behavior still emerged from the proton Fermi energies at the neutron numbers N=20 and 28 as well,but not in binding energies.
文摘为了进一步解决基于电容-二极管(capacitance-diode,CD)升压单元的两相交错并联Boost高增益变换器存在的开关管数量多、输入输出不共地问题,提出了一种基于CD单元的新型3L型两相交错并联Boost变换器拓扑的构建方法,并根据在第3个升压电感前级和后级引入CD单元数量的不同,推演出基于FN-BMCD单元的3L型高增益Boost变换器的演化规律;以F2-B1CD单元的3L型Boost变换器为例,详细分析了5个开关模态的工作原理,揭示了各电感及电容寄生参数对电压增益的影响机理;搭建由数字信号处理(digital signal processing,DSP)芯片和实时仿真机组成的控制在环半实物仿真实验平台,验证了所提新型变换器拓扑理论分析的正确性。
