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A simple approach for the estimation of CO_2 penetration depth into a caprock layer

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journal of Rock Mechanics and geotechnical Engineering 2016年第1期8卷 75-86页

作者： j.g.wang Yang ju Feng gao jia Liu School of Mechanics and Civil Engineering China University of Mining and Technology State Key Laboratory for geomechanics and Deep Underground Engineering China University of Mining and Technology State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology

Caprock is a water-saturated formation with a sufficient entry capillary pressure to prevent the upward migration of a buoyant fluid. When the entry capillary pressure of caprock is smaller than the pressure exerted by the buoyant CO2plume, CO2gradually penetrates into the caprock. The CO2penetration depth into a caprock layer can be used to measure the caprock sealing efficiency and becomes the key issue to the assessment of caprock sealing efficiency. On the other hand, our numerical simulations on a caprock layer have revealed that a square root law for time and pore pressure exists for the CO2penetration into the caprock layer. Based on this finding, this study proposes a simple approach to estimate the CO2penetration depth into a caprock layer. This simple approach is initially developed to consider the speed of CO2invading front. It explicitly expresses the penetration depth with pressuring time, pressure difference and pressure magnitude. This simple approach is then used to fit three sets of experimental data and good fittings are observed regardless of pressures, strengths of porous media, and pore fluids(water,hydrochloric acid, and carbonic acid). Finally, theoretical analyses are conducted to explore those factors affecting CO2penetration depth. The effects of capillary pressure, gas sorption induced swelling, and fluid property are then included in this simple approach. These results show that this simple approach can predict the penetration depth into a caprock layer with sufficient accuracy, even if complicated interactions in penetration process are not explicitly expressed in this simple formula.

关键词： Fracture-matrix system Fully coupled model Two-phase flow model Square root law Simple approach CO_2 penetration depth Caprock sealing efficiency

Intensities and shifts of Lyman and Balmer lines of hydrogen-like ions in high density plasmas

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Matter and Radiation at Extremes 2018年第6期3卷 300-311页

作者： g.P.Zhao L.Liu j.g.wang R.K.janev j.Yan Institute of Applied Physics and Computational Mathematics P.O.Box 8009-26Beijing 100088China Macedonian Academy of Sciences and Arts P.O.Box 4281000 SkopjeMacedonia

The spectral line intensities and line shifts of Lyman and Balmer series for transitions up to n=5 of hydrogen-like ion are studied in plasmas with densities and temperatures in the ranges n_(c)~10^(18)-10^(21)cm^(-3),T_(e)=0.3e1.2 eV *** screened potential used to describe the interaction between charged particles includes the electron exchange-correlation and finite-temperature gradient effects and is valid for both weakly and strongly coupled *** dependencies of alpha,beta and gamma line shifts of Lyman and Balmer series on plasma density(for fixed temperature)and temperature(for fixed density)are *** results for the H_(a)line shifts are compared with the available high-density experimental data.

关键词： Screened coulomb interaction Hydrogen-like ion Spectral lines High density plasmas

Dynamics of N^(5+)-H electron capture in Debye plasmas

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Matter and Radiation at Extremes 2016年第2期1卷 114-122页

作者： L.Liu j.g.wang Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsP.O.Box 8009-26Beijing100088People's Republic of China

The electron capture in N^(5+)-H collisions imbedded in a Debye plasma is studied by using the two-center atomic orbital close-coupling method in the energy range from 1 keV/u to 200 keV/*** atomic orbitals and electron binding energies of atomic states are calculated within the Debye-Huckel approximation of the screened Coulomb potential and used in atomic orbital close-coupling dynamics formalism to calculate the electron capture cross *** electron capture cross sections and the charge transfer spectral lines of N^(4+)(1s^(2)nl)for a number of representative screening parameter values are presented and *** is found that the screening of Coulomb interactions affects the entire collision dynamics and the magnitude and energy behavior of state-selective cross *** changes in electron binding energies and capture cross sections when the interaction screening varies introduce dramatic changes in the radiation spectrum of N^(4+)(1s^(2)nl)capture states with respect to the unscreened interaction case.

关键词： Electron capture Debye plasma Screening Atomic orbital close-coupling

Investigation on Collision of Si^(2+)with H from Intermediate to High Projectile Energies

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Communications in Computational Physics 2006年第5期1卷 886-897页

作者： B.He j.g.wang C.L.Liu Y.Ning Y.B.Qiu j.Yan P.C.Stancil Key Laboratory of Computational Physics Institute of Applied Physics and Computational MathematicsBeijing 100088P.R.China Department of Physics and Astronomy and the Center for Simulational Physics University of GeorgiaAthensGA 30602-2451USA

Total and state-selective charge transfer,ionization and stripping cross sections due to the collision of Si^(2+)ion with atomic hydrogen are investigated using the classical-trajectory Monte-Carlo(CTMC)method in the collision energy from 1 keV/amu to 10 MeV/*** electron capture rate coefficient is obtained in the temperature range from 105 Ko to 108 *** with the data available shows that our CTMC results are *** behaviors for these cross sections varying with the projectile energy are analyzed.A classical physical picture is presented to explain the reason behind the behaviors.

关键词： CTMC method charge transfer ionization stripping

Radiative charge transfer and association in Li--H collisions

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Radiative charge transfer and association in Li--H collision...

第六届全国计算原子与分子物理学术会议

作者： X.H.Lin Yong Wu Bin Shao j.g.wang Data Center for High Energy Density Matter Institute of Applied Physics and Computational Mathematics School of Physics Beijing Institute of Technology

The nonradiative charge transfer processes in collisions of Li(1s2s)and H(1s)atom are investigated by using the quantum-mechanical molecular-orbital close-coupling method[1,2,3]in the energy range of 6×10-10eV/*** radiative decay,radiative charge transfer and radiative association processes are calculated by using optical potential,semiclassical and fully quantum approaches[4,5]for the energy range

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Investigation on Novel Structures of Ferroelectric Phase Shifter（FEPS）

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Investigation on Novel Structures of Ferroelectric Phase Shi...

2005'全国微波毫米波会议

作者： W.Che j.g.wang Edward K.N.Yung Department of Communication Engineering Nanjing University of Science & Technology Department of Electronic Engineering City University of Hong Kong

＜正＞Several novel structures of ferroelectric phase shifters（FEPS） have been investigated in this *** characteristics of phase shift and insertion loss have been illustrated,and their figure of merit has been *** simulation results have indicated that it is most of important to choose an appropriate structure for the construction of the ferroelectric phase shifter employed for phased arrays.

关键词： Ferroelectric phase shifter phase shift insertion loss microstrip slotline

Stark-broadened profiles of the spectral lines in He Ⅱ ions

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Stark-broadened profiles of the spectral lines in He Ⅱ ions

第六届全国计算原子与分子物理学术会议

作者： B.Duan M.A.Bari Z.Q.Wu j.Yan j.g.wang Institute of Applied Physics and Computational Mathematics Pakistan Atomic Energy Commission

This paper introduces a theoretical approach for the calculations of spectral line broadening in plasmas. As an example, the line profiles of Stark broadening the Lyman pectral lines（ Lyα and Lyβ） and Paschen line（Pα） are calculated and investigated with this approach under some interesting plasma conditions. In our calculations, Dirac R-matrix methods [1]are used to calculate electron-impact broadening operators[2-6], which are assumed to be diagonal matrix to simplify. The Standard（Hooper） theory is chosen to calculate the electric microfield distribution function. Furthermore the population density（bm） of ionization state m is obtained by the Boltzmann-Saha equations. The dipole matrix and the required atomic structure data are calculated by the atomic structure gRASP package. Thus Stark-broadened line profiles of the Lyman spectral lines and P α in He II ion are computed in a systematic manner[7,8]. These spectral line-broadening parameters are considerably important for plasma spectroscopy and plasma diagnosis as well as a key stone in plasma modeling.

关键词： Stark broadening line shapes atomic data

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单临空面岩体中爆破诱发损伤的数值分析

岩土力学 2006年第2期27卷 219-223,227页

作者：王志亮王建国李永池中国科学技术大学力学与机械工程系合肥230027 新加坡国立大学热带海洋研究所新加坡119260

岩石的抗压强度远大于其抗拉强度,所以在单临空面岩体爆破中,工程技术人员关注的不仅是炮孔附近的塑性压剪损伤,更多的是临空面附近的拉裂损伤,临空面若是地表,可能会影响到施工的安全,甚至造成一定的经济损失。以往这类损伤问题的数值... 详细信息

岩石的抗压强度远大于其抗拉强度,所以在单临空面岩体爆破中,工程技术人员关注的不仅是炮孔附近的塑性压剪损伤,更多的是临空面附近的拉裂损伤,临空面若是地表,可能会影响到施工的安全,甚至造成一定的经济损失。以往这类损伤问题的数值模拟中大多只偏向于一方面:或忽略压剪损伤,或不考虑拉裂损伤,故所得出的结论难以满足工程需要。基于合理的应力修正方式,把现有的岩石拉-压损伤本构以简明的方式嵌入到大型LS-DYNA软件中,对单临空面岩体中的柱形和球形药包爆破问题进行了数值模拟,计算结果表明该法能较好地预测岩体中爆破诱发的拉裂、压缩损伤的分布规律和演化趋势。

关键词：岩体单临空面工程爆破损伤数值分析

Cross section for spin-resolved electron capture in He+-H collision

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Cross section for spin-resolved electron capture in He+-H co...

第六届全国计算原子与分子物理学术会议

作者： Y.Wu L.Liu X.H.Lin j.g.wang R.K.janev Data Center for High Energy Density Matter Institute of Applied Physics and Computational Mathematics School of Physics Beijing Institute of Technology Macedonian Academy of Sciences and Arts

Electron-capture and excitation processes in He+H collisions have been studied by using the full quantum-mechanical molecular orbital close-coupling(QMOCC)[1,2,3]and the two-center atomic orbital close-coupling(TC-AOCC)[4]methods in the energy ranges 10-5ke V/u and 0.1-100ke V/u,*** molecular structure data,including potential curves,radial coupling and rotational coupling matrix

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