Quasi-classical trajectory theory is used to study the reaction of O（3p） with H2 （D2） based on the ground 3A″ potential energy surface （PES）. The reaction cross section of the reaction O＋H2→＋OH＋H is in exce...Quasi-classical trajectory theory is used to study the reaction of O（3p） with H2 （D2） based on the ground 3A″ potential energy surface （PES）. The reaction cross section of the reaction O＋H2→＋OH＋H is in excellent agreement with the previous result. Vector correlations, product rotational alignment parameters （P2（j′. k）） and several polarizeddependent differential cross sections are further calculated for the reaction. The product polarization distribution exhibits different characteristics that can be ascribed to different motion paths on the PES, arising from various collision energies or mass factors.展开更多
We perform a research of the influence of atomic electrons correlation to some characteristics of the (e,2e) process on helium. The Hilleraas type J-matrix approach was used for numerical calculations.
In this study,neutron activation experiments were performed to measure the(n,2n)reaction cross section for80Kr at five neutron energies,13.59±0.12,13.86±0.15,14.13±0.16,14.70±0.13,and 14.94±0....In this study,neutron activation experiments were performed to measure the(n,2n)reaction cross section for80Kr at five neutron energies,13.59±0.12,13.86±0.15,14.13±0.16,14.70±0.13,and 14.94±0.02 MeV,using a highly enriched gaseous sample.The neutron energies and their uncertainties were determined using the Q-value equation for the3H(d,n)4He reaction,accounting for the solid angle of the sample.The ^(93)Nb(n,2n)^(92m)Nb reaction was employed to monitor the neutron flux.Eight characteristic gamma rays of the produced nucleus were selected to determine the activity of the generated nuclei.The final cross sections were obtained using a weighted average method.The self-absorption and cascade of rays,as well as the geometry and solid angles of the sample,were corrected.The ^(80)Kr(n,2n)^(79)Kr reaction cross sections obtained in this work exhibited the smallest uncertainty than the values in existing literature,which provided improved experimental constraints for the prediction of excitation curves,thereby enhancing the quality of the corresponding database.The measured results were compared with previously reported experimental values,empirical and systematic formula predictions,theoretical calculations from TALYS-1.96 with six adjustable energy level densities,and evaluated database results.Our experimental results demonstrated high precision and extended the energy range appropriately,offering valuable insights for future studies.展开更多
This article discusses the enhanced oil recovery numerical simulation of the chemical flooding(such as surfactants, alcohol, polymers) composed of two-dimensional multicomponent, ultiphase and incompressible mixed flu...This article discusses the enhanced oil recovery numerical simulation of the chemical flooding(such as surfactants, alcohol, polymers) composed of two-dimensional multicomponent, ultiphase and incompressible mixed fluids. After the oil field is waterflooded, there is still a large amount of crude oil left in the oil deposit. By adding certain chemical substances to the fluid injected, its driving capacity can be greatly increased. The mathematical model of two-dimensional enhanced oil recovery simulation can be described展开更多
A 2-dimensional, multicomponent, multiphase, and incompressible compositional reservoir simulator has been developed and applied to chemical flooding (surfactants, alcohol and polymers) and convergence analysis. The c...A 2-dimensional, multicomponent, multiphase, and incompressible compositional reservoir simulator has been developed and applied to chemical flooding (surfactants, alcohol and polymers) and convergence analysis. The characteristic finite difference methods for 2-dimensional enhanced oil recovery can be described as a coupled system of nonlinear partial differential equations. For a generic case of the cross interference and bounded region, we put forward a kind of characteristic finite difference schemes and make use of thick and thin grids to form a complete set, and of calculus of variations, the theory of prior estimates and techniques. Optimal order estimates in L^2 norm are derived for the error in the approximate solutions. Thus we have thoroughly solved the well-known theoretical problem proposed by a famous scientist, J. Douglas, Jr.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos.60977063 and 10574039)the Innovation Scientists and Technicians Troop Construction Projects of Henan Province of China (Grant No.084100510011)
文摘Quasi-classical trajectory theory is used to study the reaction of O（3p） with H2 （D2） based on the ground 3A″ potential energy surface （PES）. The reaction cross section of the reaction O＋H2→＋OH＋H is in excellent agreement with the previous result. Vector correlations, product rotational alignment parameters （P2（j′. k）） and several polarizeddependent differential cross sections are further calculated for the reaction. The product polarization distribution exhibits different characteristics that can be ascribed to different motion paths on the PES, arising from various collision energies or mass factors.
文摘We perform a research of the influence of atomic electrons correlation to some characteristics of the (e,2e) process on helium. The Hilleraas type J-matrix approach was used for numerical calculations.
基金Supported by the National Natural Science Foundation of China(12375295,12165006)。
文摘In this study,neutron activation experiments were performed to measure the(n,2n)reaction cross section for80Kr at five neutron energies,13.59±0.12,13.86±0.15,14.13±0.16,14.70±0.13,and 14.94±0.02 MeV,using a highly enriched gaseous sample.The neutron energies and their uncertainties were determined using the Q-value equation for the3H(d,n)4He reaction,accounting for the solid angle of the sample.The ^(93)Nb(n,2n)^(92m)Nb reaction was employed to monitor the neutron flux.Eight characteristic gamma rays of the produced nucleus were selected to determine the activity of the generated nuclei.The final cross sections were obtained using a weighted average method.The self-absorption and cascade of rays,as well as the geometry and solid angles of the sample,were corrected.The ^(80)Kr(n,2n)^(79)Kr reaction cross sections obtained in this work exhibited the smallest uncertainty than the values in existing literature,which provided improved experimental constraints for the prediction of excitation curves,thereby enhancing the quality of the corresponding database.The measured results were compared with previously reported experimental values,empirical and systematic formula predictions,theoretical calculations from TALYS-1.96 with six adjustable energy level densities,and evaluated database results.Our experimental results demonstrated high precision and extended the energy range appropriately,offering valuable insights for future studies.
基金This project is sponsored by the National Scaling Programthe National Eighth-Five-Year Tackling Key Problems Program
文摘This article discusses the enhanced oil recovery numerical simulation of the chemical flooding(such as surfactants, alcohol, polymers) composed of two-dimensional multicomponent, ultiphase and incompressible mixed fluids. After the oil field is waterflooded, there is still a large amount of crude oil left in the oil deposit. By adding certain chemical substances to the fluid injected, its driving capacity can be greatly increased. The mathematical model of two-dimensional enhanced oil recovery simulation can be described
基金Project supported by the National Scaling Program and the National Eighth-Five-Year Tackling Key Problems Program
文摘A 2-dimensional, multicomponent, multiphase, and incompressible compositional reservoir simulator has been developed and applied to chemical flooding (surfactants, alcohol and polymers) and convergence analysis. The characteristic finite difference methods for 2-dimensional enhanced oil recovery can be described as a coupled system of nonlinear partial differential equations. For a generic case of the cross interference and bounded region, we put forward a kind of characteristic finite difference schemes and make use of thick and thin grids to form a complete set, and of calculus of variations, the theory of prior estimates and techniques. Optimal order estimates in L^2 norm are derived for the error in the approximate solutions. Thus we have thoroughly solved the well-known theoretical problem proposed by a famous scientist, J. Douglas, Jr.
