In this work,based on the liquid-drop model and considering the shell correction,we propose a simple formula to calculate the released energy of proton radioactivity(Q_(p)).The parameters of this formula are obtained ...In this work,based on the liquid-drop model and considering the shell correction,we propose a simple formula to calculate the released energy of proton radioactivity(Q_(p)).The parameters of this formula are obtained by fitting the experimental data of 29 nuclei with proton radioactivity from ground state.The standard deviation between the theoretical values and experimental ones is only 0.157 Me V.In addition,we extend this formula to calculate 51 proton radioactivity candidates in region 51≤Z≤83 taken from the latest evaluated atomic mass table AME2016 and compared with the Q_(p)calculated by WS4 and HFB-29.The calculated results indicate that the evaluation ability of this formula for Q_(p)is inferior to WS4 while better than HFB-29.展开更多
合成润滑油广泛应用于各类制冷与热泵设备,其热物理性质是分析热力学能效、换热性能和沿程压降的基础数据,对评价和优化系统结构具有重要意义。本文研制了一套低温、高压悬滴法表面张力实验测量系统,并使用振动管密度计与悬滴法表面张...合成润滑油广泛应用于各类制冷与热泵设备,其热物理性质是分析热力学能效、换热性能和沿程压降的基础数据,对评价和优化系统结构具有重要意义。本文研制了一套低温、高压悬滴法表面张力实验测量系统,并使用振动管密度计与悬滴法表面张力实验系统开展了基础润滑油(POE、PVE和PAG)的液相密度和表面张力实验研究,测量的温度范围为243.15~363.15 K,液相密度和表面张力测量的扩展不确定度分别在0.2%和0.1 m N·m^(-1)以内。实验结果表明:基础润滑油的液相密度和表面张力均随温度的增大而减小,关联方程的计算值与实验值的绝对平均偏差分别小于0.04%和0.5%。展开更多
基金Supported by National Natural Science Foundation of China(Grant No.11205083 and No.11975132)the construct program of the key discipline in Hunan province,the Research Foundation of Education Bureau of Hunan Province,China(Grant No.18A237)+1 种基金the Innovation Group of Nuclear and Particle Physics in USC,the Shandong Province Natural Science Foundation,China(Grant No.ZR2019YQ01)the Hunan Provincial Innovation Foundation For Postgraduate(Grant No.CX20200909)。
文摘In this work,based on the liquid-drop model and considering the shell correction,we propose a simple formula to calculate the released energy of proton radioactivity(Q_(p)).The parameters of this formula are obtained by fitting the experimental data of 29 nuclei with proton radioactivity from ground state.The standard deviation between the theoretical values and experimental ones is only 0.157 Me V.In addition,we extend this formula to calculate 51 proton radioactivity candidates in region 51≤Z≤83 taken from the latest evaluated atomic mass table AME2016 and compared with the Q_(p)calculated by WS4 and HFB-29.The calculated results indicate that the evaluation ability of this formula for Q_(p)is inferior to WS4 while better than HFB-29.
文摘合成润滑油广泛应用于各类制冷与热泵设备,其热物理性质是分析热力学能效、换热性能和沿程压降的基础数据,对评价和优化系统结构具有重要意义。本文研制了一套低温、高压悬滴法表面张力实验测量系统,并使用振动管密度计与悬滴法表面张力实验系统开展了基础润滑油(POE、PVE和PAG)的液相密度和表面张力实验研究,测量的温度范围为243.15~363.15 K,液相密度和表面张力测量的扩展不确定度分别在0.2%和0.1 m N·m^(-1)以内。实验结果表明:基础润滑油的液相密度和表面张力均随温度的增大而减小,关联方程的计算值与实验值的绝对平均偏差分别小于0.04%和0.5%。
