From the mathematical principles, the generalized potential theory can be employed to create constitutive model of geomaterial directly. The similar Cam-clay model, which is created based on the generalized potential ...From the mathematical principles, the generalized potential theory can be employed to create constitutive model of geomaterial directly. The similar Cam-clay model, which is created based on the generalized potential theory, has less assumptions,clearer mathematical basis, and better computational accuracy. Theoretically, it is more scientific than the traditional Cam-clay models. The particle flow code PFC3 D was used to make numerical tests to verify the rationality and practicality of the similar Cam-clay model. The verification process was as follows: 1) creating the soil sample for numerical test in PFC3 D, and then simulating the conventional triaxial compression test, isotropic compression test, and isotropic unloading test by PFC3D; 2)determining the parameters of the similar Cam-clay model from the results of above tests; 3) predicting the sample's behavior in triaxial tests under different stress paths by the similar Cam-clay model, and comparing the predicting results with predictions by the Cam-clay model and the modified Cam-clay model. The analysis results show that the similar Cam-clay model has relatively high prediction accuracy, as well as good practical value.展开更多
The astrophysical S-factor of the ^(12)C(p,γ_(0))^(13)N reaction at energies from 25 keV to 5 MeV within the framework of a modified potential cluster model with forbidden states is considered.The experimental phase ...The astrophysical S-factor of the ^(12)C(p,γ_(0))^(13)N reaction at energies from 25 keV to 5 MeV within the framework of a modified potential cluster model with forbidden states is considered.The experimental phase shifts resonant δ_(2)_(S_(1/2)),δ_(2)_(S_(3/2)),and non-resonant δ_(2)_(D_(3/2)) at the energies up to E_(c.m.)=3 MeV are reproduced with high accuracy,which provides the appropriate agreement with the experimental data for the S-factor of 1950-2023 years.Two sets of asymptotic constant are used:Set I refers to C_(w)=1.30(2),and Set II refers to C_(w)=1.37(1).Set I leads to the astrophysical factor S(25)=1.34±0.02 keV-b,which is in agreement with data by Skowronski et al.,2023-1.34±0.09 keV-b;Set II gives S(25)=1.49±0.02 keV-b,which is in agreement with data by Kettner et al.,2023-1.48±0.09 keV-b.The reaction rates of ^(12)C(p,γ_(0))^(13)N at temperatures T_(9) from 0.001 to 10 are calculated.The detailed comparison with some models,the R-matrix approach,and NACRE II data for reaction rates is considered.展开更多
基金Projects(51378131,51378403)supported by the National Natural Science Foundation of ChinaProject(2012210020203)supported by the Fundamental Research Funds for the Central Universities,China
文摘From the mathematical principles, the generalized potential theory can be employed to create constitutive model of geomaterial directly. The similar Cam-clay model, which is created based on the generalized potential theory, has less assumptions,clearer mathematical basis, and better computational accuracy. Theoretically, it is more scientific than the traditional Cam-clay models. The particle flow code PFC3 D was used to make numerical tests to verify the rationality and practicality of the similar Cam-clay model. The verification process was as follows: 1) creating the soil sample for numerical test in PFC3 D, and then simulating the conventional triaxial compression test, isotropic compression test, and isotropic unloading test by PFC3D; 2)determining the parameters of the similar Cam-clay model from the results of above tests; 3) predicting the sample's behavior in triaxial tests under different stress paths by the similar Cam-clay model, and comparing the predicting results with predictions by the Cam-clay model and the modified Cam-clay model. The analysis results show that the similar Cam-clay model has relatively high prediction accuracy, as well as good practical value.
基金Carried out within Project No.AP19676483«Study of hydrogen thermonuclear fusion processes in the CNO cycle in the Sun and in stars»,supported by the Ministry of Science and Higher Education of the Republic of Kazakhstan.
文摘The astrophysical S-factor of the ^(12)C(p,γ_(0))^(13)N reaction at energies from 25 keV to 5 MeV within the framework of a modified potential cluster model with forbidden states is considered.The experimental phase shifts resonant δ_(2)_(S_(1/2)),δ_(2)_(S_(3/2)),and non-resonant δ_(2)_(D_(3/2)) at the energies up to E_(c.m.)=3 MeV are reproduced with high accuracy,which provides the appropriate agreement with the experimental data for the S-factor of 1950-2023 years.Two sets of asymptotic constant are used:Set I refers to C_(w)=1.30(2),and Set II refers to C_(w)=1.37(1).Set I leads to the astrophysical factor S(25)=1.34±0.02 keV-b,which is in agreement with data by Skowronski et al.,2023-1.34±0.09 keV-b;Set II gives S(25)=1.49±0.02 keV-b,which is in agreement with data by Kettner et al.,2023-1.48±0.09 keV-b.The reaction rates of ^(12)C(p,γ_(0))^(13)N at temperatures T_(9) from 0.001 to 10 are calculated.The detailed comparison with some models,the R-matrix approach,and NACRE II data for reaction rates is considered.
