目的采用SQL Server软件对古代治疗疫病方剂中的栀子豉汤类方进行关联分析,探讨关联规则参数设置在类方药物配伍、药-症关联分析中的作用。方法在"古方疫病数据库"中检索包含栀子、淡豆豉的方剂,并将标准化后的症状、药物数...目的采用SQL Server软件对古代治疗疫病方剂中的栀子豉汤类方进行关联分析,探讨关联规则参数设置在类方药物配伍、药-症关联分析中的作用。方法在"古方疫病数据库"中检索包含栀子、淡豆豉的方剂,并将标准化后的症状、药物数据导入SQL Server 2005软件形成关联规则,并通过调整参数,寻找参数设置与产生规则之间的规律。结果通过调整参数可有效挖掘多种不同的药物间和药-症间规则:支持度的设置有助发现常用配伍,置信度的调整有助挖掘特异性的药物、药-症规则;支持度高的项集所在的规则,其重要性反而降低。结论综合关联规则的支持度、置信度、重要性,并结合药、症的实际意义,可对类方中药物配伍和药-症关联开展有效挖掘。展开更多
Isoscaling behaviour of the statistical emission fragments from the equilibrated sources with Z = 30 and N = 30, 33, 36 and 39 is investigated in the framework of the isospin-dependent lattice gas model. The dependenc...Isoscaling behaviour of the statistical emission fragments from the equilibrated sources with Z = 30 and N = 30, 33, 36 and 39 is investigated in the framework of the isospin-dependent lattice gas model. The dependences of isoscaling parameters α on source isospin asymmetry, temperature and freeze-out density are studied, and the ＇symmetry energy＇ is deduced from isoscaling parameters. The results show that symmetry energy Csym is insensitive to the change of temperature but follows the power-law dependence on the freeze-out density p. The effect of strength of asymmetry of nucleon-nucleon interaction potential on the density dependence of the symmetry energy is discussed.展开更多
A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton ...A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron number, R21（N, Z） = Y2（ N, Z）/Y1（ N, Z） = Cexp（αN -βZ）. It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the source size on α andβ has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and △（Z/A）2 or△（N/A）2 of the sources. Symmetry energy coefticient Gsym is constrained from the relationship of a and source △（Z/A）2, /3 and source △（N/A）2.展开更多
We investigate the cross sections of the elastic electron or positron scat tering from 208 Pb, ^12C ^12,16O and ^28,32S by the relativistic partial-wave expansion method using the static charge density distribution fr...We investigate the cross sections of the elastic electron or positron scat tering from 208 Pb, ^12C ^12,16O and ^28,32S by the relativistic partial-wave expansion method using the static charge density distribution from the self-consistent relativistic mean fiel model and also calculate the charge form factor for ^12＇16O and ^28,32S. The numerical results are compared with the available data. Calculations indicate that the extended charge density distributions of ^12O and ^28S have observable effects on the cross sections of the electron or positron scattering as well as the charge form factors.展开更多
In this paper, the isotopic and isotonic distributions of projectile fragmentation products have been simulated by a modified statistical abrasion-ablation model and the isoscaling behaviour of projectile-like fragmen...In this paper, the isotopic and isotonic distributions of projectile fragmentation products have been simulated by a modified statistical abrasion-ablation model and the isoscaling behaviour of projectile-like fragments has been discussed. The isoscaling parameters α and β have been extracted respectively, for hot fragments before evaporation and cold fragments after evaporation. It looks that the evaporation has stronger effect on α than β. For cold fragments, a monotonic increase of α and ｜β｜ with the increase of Z and N is observed. The relation between isoscaling parameter and the change of isospin content is discussed.展开更多
Measurements of the total reaction cross section for^(12-16)C,^(14-17)N and^(16-18)O on carbon target at intermediate energies were performed on RIBLL of HIRFL.A larger enhancement ofσR for^(15)C was observed than th...Measurements of the total reaction cross section for^(12-16)C,^(14-17)N and^(16-18)O on carbon target at intermediate energies were performed on RIBLL of HIRFL.A larger enhancement ofσR for^(15)C was observed than that for its neighbors.The analysis of these data indicates possible existence of an anomalous nuclear structure in^(15)C.A new quantity was suggested as the criterion to distinguish anomalous structure nuclei from normal nuclei.展开更多
Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured experimentally.The isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It ...Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured experimentally.The isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It is predicted that the isotopic distribution shifts toward the neutron rich side for neutron rich projectile,but this isospin effect decreases with the increase of the atomic number difference Z-Z_(A)and disappears at last,where Z and Z_(A)are atomic numbers of the isotopic distribution and the projectile respectively.展开更多
The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density distribution.When the width parameter of the square distribut...The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density distribution.When the width parameter of the square distribution is obtained by fittingσR at relativistic energies,the BUU-model can reproduce the experimental data at intermediate energies better than Glauber model.The systematical underestimation ofσR at intermediate energy by Glauber model was removed out now by BUU calculation framework.It is also found thatσR is sensitive to nuclear equation of state andσin-NN medium.The difference factor d defined in text is sensitive to the nuclear structure such as neutron halo and neutron skin,etc.展开更多
Isospin effects of the critical phenomena were studied via Xe isotopes in the frame of the lattice gas model.All the critical temperatures for four Xe isotopes are close to 5.5 MeV at the same freeze-out density of ab...Isospin effects of the critical phenomena were studied via Xe isotopes in the frame of the lattice gas model.All the critical temperatures for four Xe isotopes are close to 5.5 MeV at the same freeze-out density of about 0.39ρ0.The critical values of power law parameter of mass distribution,mean multiplicity of intermediate mass fragments,information entropy and Campi's second moment show minor dependence on the isospin at the critical point.展开更多
文摘目的采用SQL Server软件对古代治疗疫病方剂中的栀子豉汤类方进行关联分析,探讨关联规则参数设置在类方药物配伍、药-症关联分析中的作用。方法在"古方疫病数据库"中检索包含栀子、淡豆豉的方剂,并将标准化后的症状、药物数据导入SQL Server 2005软件形成关联规则,并通过调整参数,寻找参数设置与产生规则之间的规律。结果通过调整参数可有效挖掘多种不同的药物间和药-症间规则:支持度的设置有助发现常用配伍,置信度的调整有助挖掘特异性的药物、药-症规则;支持度高的项集所在的规则,其重要性反而降低。结论综合关联规则的支持度、置信度、重要性,并结合药、症的实际意义,可对类方中药物配伍和药-症关联开展有效挖掘。
基金Supported in part by the National Basic Research Programme of China under Contract No 2007CB815004, the Shanghai Development Foundation for Science and Technology under Grant Nos 06JC14082 and 06QA14062, the National Natural Science Foundation of China under Grant Nos 10535010 and 10775167.
文摘Isoscaling behaviour of the statistical emission fragments from the equilibrated sources with Z = 30 and N = 30, 33, 36 and 39 is investigated in the framework of the isospin-dependent lattice gas model. The dependences of isoscaling parameters α on source isospin asymmetry, temperature and freeze-out density are studied, and the ＇symmetry energy＇ is deduced from isoscaling parameters. The results show that symmetry energy Csym is insensitive to the change of temperature but follows the power-law dependence on the freeze-out density p. The effect of strength of asymmetry of nucleon-nucleon interaction potential on the density dependence of the symmetry energy is discussed.
基金Supported by the National Natural Science Foundation of China under Grant Nos 10405033, 10405032, 10505026 and 10135030, the Shanghai Development Foundation for Science and Technology under Grant Nos 05XD14021 and 03QA14066, and the Major State Basic Research Programme under Contract No G200077404.
文摘A sequential decay model is used to study isoscaling, i.e. the factorization of the isotope ratios from sources of different isospins and sizes over a broad range of excitation energies, into fugacity terms of proton and neutron number, R21（N, Z） = Y2（ N, Z）/Y1（ N, Z） = Cexp（αN -βZ）. It is found that the isoscaling parameters α and β have a strong dependence on the isospin difference of equilibrated source and excitation energy, no significant influence of the source size on α andβ has been observed. It is found that α and β decrease with the excitation energy and are linear functions of 1/T and △（Z/A）2 or△（N/A）2 of the sources. Symmetry energy coefticient Gsym is constrained from the relationship of a and source △（Z/A）2, /3 and source △（N/A）2.
基金Supported partially by the Shanghai Development Foundation from Science and Technology under Grant Nos 05XD14021 and 06QA14062, the National Natural Science Foundation of China under Grant No 10328259, 10135030 and 10535010, and the Major State Basic Research and Development Programme under Grant No G200077404.
文摘We investigate the cross sections of the elastic electron or positron scat tering from 208 Pb, ^12C ^12,16O and ^28,32S by the relativistic partial-wave expansion method using the static charge density distribution from the self-consistent relativistic mean fiel model and also calculate the charge form factor for ^12＇16O and ^28,32S. The numerical results are compared with the available data. Calculations indicate that the extended charge density distributions of ^12O and ^28S have observable effects on the cross sections of the electron or positron scattering as well as the charge form factors.
基金Project supported in part by the Shanghai Development Foundation for Science and Technology of China （Crant Nos 05XD14021 and 03QA14066）, the National Natural Science Foundation of China （Grant Nos 10328259, 10135030, 10405032, 10405033 and 10475108）, the Major State Basic Research Development Program of China （Contract No G200077404）.
文摘In this paper, the isotopic and isotonic distributions of projectile fragmentation products have been simulated by a modified statistical abrasion-ablation model and the isoscaling behaviour of projectile-like fragments has been discussed. The isoscaling parameters α and β have been extracted respectively, for hot fragments before evaporation and cold fragments after evaporation. It looks that the evaporation has stronger effect on α than β. For cold fragments, a monotonic increase of α and ｜β｜ with the increase of Z and N is observed. The relation between isoscaling parameter and the change of isospin content is discussed.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grand No.19625513National Natural Science Foundation of China under Grant No.19675059+1 种基金Shanghai Science,Technology Development Fund under Grant No.96XD14011Major State Basic Research Development Program(G200077400).
文摘Measurements of the total reaction cross section for^(12-16)C,^(14-17)N and^(16-18)O on carbon target at intermediate energies were performed on RIBLL of HIRFL.A larger enhancement ofσR for^(15)C was observed than that for its neighbors.The analysis of these data indicates possible existence of an anomalous nuclear structure in^(15)C.A new quantity was suggested as the criterion to distinguish anomalous structure nuclei from normal nuclei.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grand No.19625513National Natural Science Foundation of China under Grant No.19675059Shanghai Science and Technology Development Fund under Grant No.96XD14011.
文摘Fragments produced in the reaction of 60 MeV/n^(18)O on Be have been measured experimentally.The isotopic distribution of fragmentation reaction is well reproduced by a modified statistical abrasion-ablation model It is predicted that the isotopic distribution shifts toward the neutron rich side for neutron rich projectile,but this isospin effect decreases with the increase of the atomic number difference Z-Z_(A)and disappears at last,where Z and Z_(A)are atomic numbers of the isotopic distribution and the projectile respectively.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grant No.19625513the National Natural Science Foundation of China under Grant No.19675059,the Major State Basic Research Development Program under Contract No.G200077400the Shanghai Science and Technology Development Fund under Grant No.96XD14011.
文摘The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density distribution.When the width parameter of the square distribution is obtained by fittingσR at relativistic energies,the BUU-model can reproduce the experimental data at intermediate energies better than Glauber model.The systematical underestimation ofσR at intermediate energy by Glauber model was removed out now by BUU calculation framework.It is also found thatσR is sensitive to nuclear equation of state andσin-NN medium.The difference factor d defined in text is sensitive to the nuclear structure such as neutron halo and neutron skin,etc.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grant No.19725521)the National Natural Science Foundation of China under Grant No.19705012+2 种基金the Science and Technology Development Foundation of Shanghai under Grant No.97QA14038the Special Project of the Presidential Foundation of Chinese Academy of Sciencesthe Scientific Research Foundations for Returned Overseas Chinese Scholar by the National Human Resource Administration and Education Administration of China。
文摘Isospin effects of the critical phenomena were studied via Xe isotopes in the frame of the lattice gas model.All the critical temperatures for four Xe isotopes are close to 5.5 MeV at the same freeze-out density of about 0.39ρ0.The critical values of power law parameter of mass distribution,mean multiplicity of intermediate mass fragments,information entropy and Campi's second moment show minor dependence on the isospin at the critical point.
