检索结果-南通市图书馆

Two Special Solutions of the Non-ideal Magnetohydrodynamics

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 2000年第5期17卷 382-384页

作者：冯学尚刘永魏奉思叶占银 Laboratory of Numerical Study for Heliospheric Physics Center for Space Sciences and Applied ResearchChinese Academy of SciencesBeijing 100080

A special transformation is found to solve the Magnetohydrodynamic equations,by which two classes of exactanalytic time-dependent solutions of magnetic annihilation for incompressible magnetic fluid have been obtained.The solutions derived here possesses scaling property with time t as the scale factor.We find that the currentcan perform the soliton-like behaviour in the case of asymmetric inflow.The relevant evolution characteristics inthe process of magnetic annihilation are also revealed.

关键词： annihilation soliton behaviour

Antimatter Domain and X-ray Background

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1997年第9期14卷 715-718页

作者：须重明吴雪君 Department of Physics Nanjing Normal UniversityNanjing 210097

This paper suggests an effective method to detect the antimatter domain by means of x-ray background radiation if the universe is Symmetric.The photons produced by the annihilation of electron-positron and proton-anti... 详细信息

关键词： annihilation positron Domain

A discussion on vacuum polarization correction to the cross-section of e^+e^-→γ~*/ψ →μ^+μ^-

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics C 2019年第1期43卷 24-35页

作者：金红豆周利鹏张丙新胡海明 University of Chinese Academy of Science Institute of High Energy Physics Chinese Academy of Sciences

Vacuum polarization is a part of the initial-state radiative correction for the cross-section of e^+e^- annihilation processes. In the energy region in the vicinity of narrow resonances J/ψ and ψ(3686), the vacuum polarization contribution from the resonant component has a significant effect on the line-shape of the lepton pair production cross-section. This paper discusses some basic concepts and describes an analytical calculation of the cross-section of e^+e^-→γ*/ψ→μ+μ-considering the single and double vacuum polarization effect of the virtual photon propagator. Moreover, it presents some numerical comparisons with the traditional treatments.

关键词： electron-positron annihilation resonance vacuum polarization cross-section

爱她，我们别无选择——annihilation（湮灭）影评

在线全文

学校读者我要写书评

暂无评论

初中生必读 2019年第10期 36-37,42页

作者：季海峰不详

(上接第9期)Our bodies and our minds will be fragmented into their smallest parts until no part remains. annihilation.我们的身体和思想都将分解成最小块的部分,直到一块都不剩。湮灭。此主句用的是一般将来时的被动语态。英语... 详细信息

(上接第9期)Our bodies and our minds will be fragmented into their smallest parts until no part remains. annihilation.我们的身体和思想都将分解成最小块的部分,直到一块都不剩。湮灭。此主句用的是一般将来时的被动语态。英语动词有两种语态:主动语态和被动语态。两种语态都有多种时态。

关键词：不定代词情态动词 annihilation 一般将来时

Vacancy-Type Defects in Neutron-Irradiated Silicon

在线全文

学校读者我要写书评

暂无评论

Chinese Physics Letters 1993年第10期10卷 605-608页

作者： MENG Xiangti Institute of Nuclear Energy Tcchnologyf Tsinghua UniversityBeijing 100084

Position annihilation measurements show that the radiation defects and secondary defects in neutron-transmutation-doped(NTD)Si irradiated by two neutron doses can he removed at 600-650℃。The concentration and annealing behavior of V-type and Vo defects are related to the neutron doses.V_(4 )appears at 150℃ and 450℃-550℃ in NTD Si irradiated by higher neutron dose.

关键词： irradiated removed annihilation

Ultrafast Optical Response of Phthalocyanine Langmuir-Blodegett Film

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics Letters 1994年第4期11卷 246-249页

作者： YUAN Ping XIA Zongju ZOU Yinghua QIU Ling SHEN Jifeng SHEN Yuquan XU Huijun Department of Physics Mesoscopic Physics Laboratory(MPL)Peking UniversityBeijing 100871 Institute of Photographic Chemistry Academia SinicaBeijing 100101

The mechanism of 2,9,16,23-tetra-heptadecylamido substituted vanadyl phthalocyanine Langmuir-Blodegett film was studied with femtosecond laser pulses.An ultrafast decay due to phonon-exciton coupling greatly affected by temperature,and exciton-exciton annihilation leading to the recovery of the ground state(T~lops)and an even slower relaxation were observed.

关键词： relaxation slower annihilation

爱她,我们别无选择——annihilation(湮灭)影评

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

初中生必读 2019年第9期 35-37页

作者：季海峰不详

影片简介&推荐理由《湮灭》讲述了不明生物入侵地球,用七彩光晕笼罩成'闪晃'区域,并逐步扩展范围。政府多次派探险队进入'闪晃'区域寻查真相;但是,踏入'闪晃'区域的人,不是集体自杀,就是自相残杀。

关键词：间接宾语系动词 annihilation 简单句双宾语结构

Density of Vacuum-Like Plasma and Hubble Constant

在线全文

学校读者我要写书评

暂无评论

Journal of High Energy Physics, Gravitation and Cosmology 2017年第4期3卷 572-587页

作者： Ilya A. Obukhov Research & Development Company “System Resources” Moscow Russia

The model in which expansion of the Universe leads to a generation of non-equilibrium vacuum-like electron-positron plasma is proposed and researched. The formulas that relate the Hubble’s constant with the concentration of plasma particles and the cosmological constant are obtained. The collective properties of vacuum-like plasma are investigated. It is shown, that the coefficient of a two-photon annihilation in such plasma is nine times less than for the free particles. A simple formula for dark energy density as a function of electron mass and charge is obtained. It was demonstrated that acceleration of plasma’s chemical potential fluctuations flow proportional of dark energy density.

关键词： Non-Equilibrium Vacuum-Like Plasma Hubble Constant Dark Energy Electron Positron annihilation Zero Enthalpy

Reformulation of Relativistic Quantum Field Theory Using Region-Like Idealization of the Elementary Particle

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Physics 2015年第11期6卷 1711-1720页

作者： Elsadig Naseraddeen Ahmed Mohamed Founder and Director Information Fluxes-FZE Company Dubai UAE

The existence of any elementary particle in universe requires the existence of some region of universe occupied by it. By taking the volume of this occupied region, the author will reformulate the relativistic quantum field theory using new 3-dimensional region-like idealization of elementary particles and hereinafter will call the total volume of all regions occupied by the elementary constituent particles of the quantum system the occupied volume. Also the author will call the set of all regions of universe filled by elementary constituent particles of the quantum system the occupied path. Always any quantum system is existed at a head of its occupied path. This path is growing by mutual filling and leaving regions of universe by its elementary constituent particles. The conservation of this elementary constituent particle requires the conservation of its occupied volume during this process. This requirement could be summarized by the following conditions: 1) the total volume of all regions of universe filled by the elementary constituent particles of the quantum system minus the total volume of all regions of universe left by these elementary constituent particles must be equal to the occupied volume of the quantum system;2) the total increase in the occupied volume of the quantum system due to the absorption of another elementary particles from outside its occupied regions minus the total decreasing in its occupied volume due to the emission of another elementary particles outside its occupied regions must be equal to the occupied volume of it. The wave-particle duality of the elementary constituent particles implied accumulation of them as the finite set of interfered waves. This accumulation of elementary constituent particles causes the absolute probabilistic nature of event of finding the elementary consistent particle in specified interfered wave, and hence the mathematical representation of this interfered wave should take into account the value of probability amplitude of finding an elementary particle

关键词： Region-Like Idealization Creation annihilation Animation Occupied Volume Occupied Path Relativistic Quantum Field Theory