本文应用Flexible Atom Code(FAC)程序用3种不同的计算方法——相对论扭曲波(DW)理论、Conlomb-Born-Exchange(CBE)近似理论、Binary-Encounter-Diaole(BED)理论,计算了类氖离子Se24+的电子碰撞截面和组态能量。不仅计算了基态1s22s22p6...本文应用Flexible Atom Code(FAC)程序用3种不同的计算方法——相对论扭曲波(DW)理论、Conlomb-Born-Exchange(CBE)近似理论、Binary-Encounter-Diaole(BED)理论,计算了类氖离子Se24+的电子碰撞截面和组态能量。不仅计算了基态1s22s22p6(1S)和激发态1s22s22p5(2P)、1s22s12p6(2S)的组态能量,而且计算了离子的电子碰撞离化截面(EII),包括三条途径:1s22s22p6(1S)→1s22s22p5(2P3/2);1s22s22p6(1S)→1s22s22p5(2P1/2);1s22s22p6(1S)→1s22s12p6(2S)。展开更多
SOI NLIGBT中热载流子效应分别通过直流电压的应力测试、TCAD仿真和电荷泵测试三种方法进行了研究。其中,不同直流电压应力条件下测得的衬底电流Isub和导通电阻Ron用来评估因热载流子效应引起的器件退化程度。为了进行理论分析,对器件...SOI NLIGBT中热载流子效应分别通过直流电压的应力测试、TCAD仿真和电荷泵测试三种方法进行了研究。其中,不同直流电压应力条件下测得的衬底电流Isub和导通电阻Ron用来评估因热载流子效应引起的器件退化程度。为了进行理论分析,对器件内部的电场强度和碰撞离化率也进行了仿真。测试得到的电荷泵电流直接验证了器件表面的损伤程度。最后讨论了SOI LIGBT在不同栅压条件下的退化机制。展开更多
The dynamic aspects of dielectric breakdown (DB) is studied in this article. A quantitative model based on impact ionization is presented. The formulae of microdefect growth rate and lifetime prediction are derived an...The dynamic aspects of dielectric breakdown (DB) is studied in this article. A quantitative model based on impact ionization is presented. The formulae of microdefect growth rate and lifetime prediction are derived and show fair agreement with experimental data in SiO2. All the fitting parameters have definite physical meanings.展开更多
The energy spectra of reflected electrons from the substrates of targets have been calculated by the bipartition model of electron transport, the contributions of the inner shen ionization events produced by the refle...The energy spectra of reflected electrons from the substrates of targets have been calculated by the bipartition model of electron transport, the contributions of the inner shen ionization events produced by the reflected electrons from the substrates in the targets to the x-ray counting in a St(Li) detector have been estimated. It has been confirmed that, by such correction to the measured data, the experimental results of inner shell ionization cross sections by electron impact with fine precision may be obtained under the condition of thick substrate.展开更多
In this paper, （2＋1）-dimensional electron acoustic waves （EAW） in an unmagnetized collisionless plasma have been studied by the linearized method and the reductive perturbation technique, respectively. The disper...In this paper, （2＋1）-dimensional electron acoustic waves （EAW） in an unmagnetized collisionless plasma have been studied by the linearized method and the reductive perturbation technique, respectively. The dispersion relation and a modified Kadomtsev-Petviashvili （KP） equation have been obtained for the EAW in the plasma considering a cold electron fluid and a vortex-like hot electrons. It is found from some numerical results that the parameter β（the ratio of the free hot electron temperature to the hot trapped electron temperature） effects on the amplitude and the Width of the electron acoustic solitary waves （EASW）. It can be indicated that the free hot electron temperature and the hot trapped electron temperature have very important effect on the characters of the propagation for the EASW.展开更多
The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a function of their momentum is studied by means of isospin-dependent Quantum Molecular Dynamics. We find that this ratio is not only sensitive ...The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a function of their momentum is studied by means of isospin-dependent Quantum Molecular Dynamics. We find that this ratio is not only sensitive to the form of the density dependence of the symmetry potential energy but also its strength determined by the symmetry energy coefficient. The uncertainties about the symmetry energy coefficient influence the accuracy of probing the density dependence of the symmetry energy by means of the N/Z ratio of free nucleons of neutron-rich nuclei.展开更多
This paper examined the bond dissociation behavior and aromatic ring architecture of basic nitrogen compounds in Sudan heavy petroleum fraction. Both broadband and quadrupole isolation modes positive-ion electrospray ...This paper examined the bond dissociation behavior and aromatic ring architecture of basic nitrogen compounds in Sudan heavy petroleum fraction. Both broadband and quadrupole isolation modes positive-ion electrospray ionization （ESI） Fourier transform ion cyclotron resonance mass spectrometry （FT-ICR MS） coupled with collision induced dissociation （CID） tech- niques were used to characterize a low sulfur crude oil derived vacuum residuum （VR）. The appropriate CID operating condi- tion was selected by comparing the molecular weight distributions of the basic nitrogen compounds under various CID operat- ing conditions. Both odd- and even-electron fragment ions were observed from the mass spectrum, indicating that the hetero- lyric and homolytic bond cleavages occurred simultaneously during the CID process. The odd-electron fragment ions were predominant in each class species, indicating preferential heterolytic bond cleavages. At the optimal CID condition, the alkyl groups decomposed deeply and just left the aromatic cores of the nitrogen compounds. No Significant variation in double bond equivalent （DBE） value was observed between the fragment and parent ions, revealing that the domination of single core structure.展开更多
In this paper,we discuss the important role of the thermalization process in the initial distribution of QGP.We find that the negligible heat conduction inside QGP can be expressed as an effective Fourier law and we f...In this paper,we discuss the important role of the thermalization process in the initial distribution of QGP.We find that the negligible heat conduction inside QGP can be expressed as an effective Fourier law and we further analyse qualitatively the results caused by a thermalized initial condition.Based on this arguments,we construct a simple phenomenological model and work with the hydro code,and then we compare our results with the experimental data and the results of the standard initial model.It is found that,as we have argued,a thermalized initial condition suppresses the value of the elliptic flow.展开更多
文摘本文应用Flexible Atom Code(FAC)程序用3种不同的计算方法——相对论扭曲波(DW)理论、Conlomb-Born-Exchange(CBE)近似理论、Binary-Encounter-Diaole(BED)理论,计算了类氖离子Se24+的电子碰撞截面和组态能量。不仅计算了基态1s22s22p6(1S)和激发态1s22s22p5(2P)、1s22s12p6(2S)的组态能量,而且计算了离子的电子碰撞离化截面(EII),包括三条途径:1s22s22p6(1S)→1s22s22p5(2P3/2);1s22s22p6(1S)→1s22s22p5(2P1/2);1s22s22p6(1S)→1s22s12p6(2S)。
文摘The dynamic aspects of dielectric breakdown (DB) is studied in this article. A quantitative model based on impact ionization is presented. The formulae of microdefect growth rate and lifetime prediction are derived and show fair agreement with experimental data in SiO2. All the fitting parameters have definite physical meanings.
文摘The energy spectra of reflected electrons from the substrates of targets have been calculated by the bipartition model of electron transport, the contributions of the inner shen ionization events produced by the reflected electrons from the substrates in the targets to the x-ray counting in a St(Li) detector have been estimated. It has been confirmed that, by such correction to the measured data, the experimental results of inner shell ionization cross sections by electron impact with fine precision may be obtained under the condition of thick substrate.
基金The project supported by National Natural Science Foundation of China under Grant No. 10575082
文摘In this paper, （2＋1）-dimensional electron acoustic waves （EAW） in an unmagnetized collisionless plasma have been studied by the linearized method and the reductive perturbation technique, respectively. The dispersion relation and a modified Kadomtsev-Petviashvili （KP） equation have been obtained for the EAW in the plasma considering a cold electron fluid and a vortex-like hot electrons. It is found from some numerical results that the parameter β（the ratio of the free hot electron temperature to the hot trapped electron temperature） effects on the amplitude and the Width of the electron acoustic solitary waves （EASW）. It can be indicated that the free hot electron temperature and the hot trapped electron temperature have very important effect on the characters of the propagation for the EASW.
基金The project supported by National Natural Science Foundation of China under Grant Nos.10175093 and 10235030+4 种基金the Science Foundation of Chinese Nuclear Industry and the State Key Basic Research Development Program under Contract No.G20000774the Knowledge Innovation Project of the Chinese Academy of Sciences under Grant No.KJCX2-SW-N02the CASK.C.Wong Post-doctors Research Award Fund
文摘The N/Z ratio of free nucleons from collisions of neutron-rich nuclei as a function of their momentum is studied by means of isospin-dependent Quantum Molecular Dynamics. We find that this ratio is not only sensitive to the form of the density dependence of the symmetry potential energy but also its strength determined by the symmetry energy coefficient. The uncertainties about the symmetry energy coefficient influence the accuracy of probing the density dependence of the symmetry energy by means of the N/Z ratio of free nucleons of neutron-rich nuclei.
基金supported by the National Basic Research Program of China(2010CB226901)the National Natural Science Foundation of China(U1162204 and 21236009)
文摘This paper examined the bond dissociation behavior and aromatic ring architecture of basic nitrogen compounds in Sudan heavy petroleum fraction. Both broadband and quadrupole isolation modes positive-ion electrospray ionization （ESI） Fourier transform ion cyclotron resonance mass spectrometry （FT-ICR MS） coupled with collision induced dissociation （CID） tech- niques were used to characterize a low sulfur crude oil derived vacuum residuum （VR）. The appropriate CID operating condi- tion was selected by comparing the molecular weight distributions of the basic nitrogen compounds under various CID operat- ing conditions. Both odd- and even-electron fragment ions were observed from the mass spectrum, indicating that the hetero- lyric and homolytic bond cleavages occurred simultaneously during the CID process. The odd-electron fragment ions were predominant in each class species, indicating preferential heterolytic bond cleavages. At the optimal CID condition, the alkyl groups decomposed deeply and just left the aromatic cores of the nitrogen compounds. No Significant variation in double bond equivalent （DBE） value was observed between the fragment and parent ions, revealing that the domination of single core structure.
基金supported by the National Natural Science Foundation of China(Grant Nos.11275097,10935001 and 11075075)the Research Fund for the Doctoral Program of Higher Education(Grant No.2012009111002)a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institution
文摘In this paper,we discuss the important role of the thermalization process in the initial distribution of QGP.We find that the negligible heat conduction inside QGP can be expressed as an effective Fourier law and we further analyse qualitatively the results caused by a thermalized initial condition.Based on this arguments,we construct a simple phenomenological model and work with the hydro code,and then we compare our results with the experimental data and the results of the standard initial model.It is found that,as we have argued,a thermalized initial condition suppresses the value of the elliptic flow.
