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Ar^+/Ar, O_2^+/O_2 and N_2^+/N_2 Elastic Momentum Collision Cross Sections: Calculation and Validation Using the Semi-Classical Model
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作者 Djilali BENYOUCEF Mohammed YOUSFI 《Plasma Science and Technology》 SCIE EI CAS CSCD 2014年第6期588-592,共5页
The aim of this paper is to obtain relevant sets of collision cross sections of the parent ions in low pressure discharges in argon, oxygen, and nitrogen, i.e., Ar+ in Ar, O2+ in O2 and N2+ in N2. These ion data ar... The aim of this paper is to obtain relevant sets of collision cross sections of the parent ions in low pressure discharges in argon, oxygen, and nitrogen, i.e., Ar+ in Ar, O2+ in O2 and N2+ in N2. These ion data are first discussed and then validated from comparisons between the calculated transport coefficients and those measured in the literature. The elastic momentum transfer collision cross sections are determined from a semi-classical approximation for the phase shift calculation based on a 12-6-4 inter-particle potential while ion transport coefficients are determined versus the reduced electric field from Monte Carlo simulations. 展开更多
关键词 inter-particle interaction potentials phase shift JWKB (Jeffreys WentzelKramers Brillouin) momentum collision cross sections Monte Carlo simulation ion trans-port coefficient
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Influence of the gassing materials on the dielectric properties of air 被引量:2
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作者 张含天 厉天威 +4 位作者 罗兵 吴翊 杨飞 孙昊 唐力 《Plasma Science and Technology》 SCIE EI CAS CSCD 2017年第5期68-73,共6页
Influence of the gassing materials, such as PA6, PMMA, and POM on the dielectric properties of air are investigated. In this work, the fundamental electron collision cross section data were carefully selected and vali... Influence of the gassing materials, such as PA6, PMMA, and POM on the dielectric properties of air are investigated. In this work, the fundamental electron collision cross section data were carefully selected and validated. Then the species compositions of the air–organic vapor mixtures were calculated based on the Gibbs free energy minimization. Finally, the Townsend ionization coefficient, the Townsend electron attachment coefficient and the critical reduced electric field strength were derived from the calculated electron energy distribution function by solving the Boltzmann transport equation. The calculation results indicated that H;O with large attachment cross sections has a great impact on the critical reduced electric field strength of the air–organic vapor mixtures. On the other hand, the vaporization of gassing materials can help to increase the dielectric properties of air circuit breakers to some degree. 展开更多
关键词 air circuit breaker gassing materials Boltzmann equation analysis dielectric properties EEDF critical reduced electric field strength electron collision cross section
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Stability analysis of wireless network with improved fluid model
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作者 Zhichao Zhou Yang Xiao Dong Wang 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2015年第6期1149-1158,共10页
Wireless communication is easily disturbed by unfortunate factors which drive the wireless environment unstable and complicated. Therefore, it is essential to consider these factors in stability analysis of the wirele... Wireless communication is easily disturbed by unfortunate factors which drive the wireless environment unstable and complicated. Therefore, it is essential to consider these factors in stability analysis of the wireless network. However, wireless channel characteristics and packets collisions are neglected in the classical fluid model. A wireless TCP fluid model (WTFM) for stability analysis of wireless network is proposed based on cross layers, which not only makes the congestion control based on random early detection (RED) available for wireless network, but also provides a more accurate model to analyze the stability of wireless system theoretically. In the proposed model, active queue management, abnormality of wireless channels and packets collisions are taken into consideration. The comparisons between evaluating results from the WTFM and the practical performance from NS2 simulations validate the accuracy of the proposed WTFM in the perspectives of delay, dropping probability, throughput, sliding window size and queue length. A set of comparisons among the proposed WTFM, the classical fluid model and the convex optimization model are conducted. The results demonstrate that the proposed WTFM model performs better than other schemes in comprehensive aspects on capturing the characteristic of the wireless network and computing complexity. 展开更多
关键词 stability analysis improved fluid model cross layers collision wireless channel characteristic.
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Laser-induced collisional energy transfer in Sr-Li system
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作者 陈德应 鲁振中 +3 位作者 樊荣伟 夏元钦 周志刚 季一勤 《Chinese Physics B》 SCIE EI CAS CSCD 2012年第8期167-172,共6页
A four-state model considering the relative velocity distribution function for calculating the cross section of laserinduced collisional energy transfer in a Sr Li system is presented and profiles of laser-induced col... A four-state model considering the relative velocity distribution function for calculating the cross section of laserinduced collisional energy transfer in a Sr Li system is presented and profiles of laser-induced collision cross section are obtained. The resulting spectra obtained from different intermediate states are strongly asymmetrical in an opposite asymmetry. Both of the two intermediate states have contributions to the final state, and none of the intermediate states should be neglected. The peak of the laser-induced collisional energy transfer (LICET) profile shifts toward the red and the FWHM becomes narrower obviously with laser field intensity increasing. A cross section of 1.2 × 10^-12 cm2 at a laser field intensity of 2.17 ×107 V/m is obtained, which indicates that this collision process can be an effective way to transfer energy selectively from a storage state to a target state. The existence of saturation for cross section with the increase of the laser intensity shows that the high-intensity redistribution of transition probabilities is an important feature of this process, which is not accounted for in a two-state treatment. 展开更多
关键词 laser-induced collisional energy transfer collision cross section Sr-Li system
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Positron total cross sections for collisions with N_2 and CO_2 at 30-3000 eV
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作者 施德恒 刘玉芳 +2 位作者 孙金锋 朱遵略 杨向东 《Chinese Optics Letters》 SCIE EI CAS CSCD 2006年第3期125-127,共3页
The total (elastic plus inelastic) cross sections for positron scattering from N2 and CO2 over the incident energy range from 30 to 3000eV are calculated using the additivity rule model at Hartree-Fock level. A comp... The total (elastic plus inelastic) cross sections for positron scattering from N2 and CO2 over the incident energy range from 30 to 3000eV are calculated using the additivity rule model at Hartree-Fock level. A complex optical model potential modified by incorporating the concept of bonded atom, which takes into account the overlapping effect of electron clouds between two atoms in a molecule, is employed to calculate the total cross section of positron-molecule scattering. The calculated total cross sections are in good agreement with those reported by experiments and other theories over a wide energy range. 展开更多
关键词 TCS Positron total cross sections for collisions with N2 and CO2 at 30-3000 eV THAN
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Landau-Zener model for electron loss of low-energy negative fluorine ions to surface cations during grazing scattering on a LiF(001) surface
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作者 周旺 张鹛枭 +5 位作者 周利华 周虎 马玉龙 郭艳玲 陈林 陈熙萌 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第11期209-215,共7页
There is no available theoretical description of electron transfer from negative projectiles at a velocity below 0.1 a.u.during grazing scattering on insulating surfaces.In this low-velocity range,electron-capture and... There is no available theoretical description of electron transfer from negative projectiles at a velocity below 0.1 a.u.during grazing scattering on insulating surfaces.In this low-velocity range,electron-capture and electron-loss processes coexist.For electron capture,the Demkov model has been successfully used to explain the velocity dependence of the negative-ion fraction formed from fast atoms during grazing scattering on insulating surfaces.For electron loss,we consider that an electron may be transferred from the formed ionic diabatic quasi-molecular state to the formed covalent diabatic quasi-molecular state by the crossing of the potential curves of negative projectiles approaching the surface cations,which can be described by the Landau-Zener two-energy-level crossing model.Combining these two models,we obtain good agreement between the experimental and calculated data for the F-LiF(OOl) collision system,which is briefly discussed. 展开更多
关键词 grazing Zener capture insulating collision Landau covalent crossing briefly quasi
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Is the kinematics of special relativity incomplete? 被引量:1
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作者 Ernst Karl Kunst 《Natural Science》 2014年第4期226-247,共22页
A thorough analysis of composite inertial motion (relativistic sum) within the framework of special relativity leads to the conclusion that every translational motion must be the symmetrically composite relativistic s... A thorough analysis of composite inertial motion (relativistic sum) within the framework of special relativity leads to the conclusion that every translational motion must be the symmetrically composite relativistic sum of a finite number of quanta of velocity. It is shown that the resulting spacetime geometry is Gaussian and the four-vector calculus to have its roots in the complex-number algebra. Furthermore, this results in superluminality of signals travelling at or nearly at the canonical velocity of light between rest frames even if resting to each other. 展开更多
关键词 Special Relativity Quantization of Velocity Absolute Rest Frame Symmetric Minkowsky-Space Duality of Inertial Motion in Dependence on Two-Way or One-Way Measurement Accelerated Propagation in the Galaxy and Beyond Variable Rest Time on Earth Rise of Interaction-Radii and Total cross Sections in High Energy Collision Events
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Calculation of laser induced collisional energy transfer in the Sr-Ca system
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作者 LU ZhenZhong1,2,CHEN DeYing1,2,FAN RongWei1,2 & XIA YuanQin1,2 1 National Key Laboratory of Science and Technology on Tunable Laser,Harbin Institute of Technology,Harbin 150080,China 2 Institute of Opto-electronics,Harbin Institute of Technology,Harbin 150080,China 《Science China(Physics,Mechanics & Astronomy)》 SCIE EI CAS 2011年第2期256-261,共6页
Based on the four-state model of laser-induced collisional energy transfer,the cross section of the collisional energy transfer in the Sr-Ca system is obtained.Various factors,including field intensity,relative speed,... Based on the four-state model of laser-induced collisional energy transfer,the cross section of the collisional energy transfer in the Sr-Ca system is obtained.Various factors,including field intensity,relative speed,and temperature,which influence the collisional cross section,are discussed for illustrating the features of the Sr-Ca laser-induced collisional energy transfer(LICET) process.The calculated results show that the LICET spectral profiles obviously become narrower when the laser field intensity increases.The collision cross section rises with laser intensity and tends to saturate.In the vicinity of the spectral profile center,the cross section at fixed laser detuning becomes smaller as the relative speed and system temperature increase.The results indicate that the intermediate states strongly affect the spectral profile of LICET. 展开更多
关键词 laser-induced collisional energy transfer collision cross section Sr-Ca system
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