搜索结果: 91-105 共查到“理学 Fermi”相关记录117条 . 查询时间(0.032 秒)
一个实用的Fermi-Dirac积分和修正Fermi-Dirac积分的数值方法及应用
数值方法 Fermi-Dirac积分
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2009/10/23
引言 对于在高能激光或粒子束照射目标靶,以及磁场约束中产生的高密度等离子体的数值模拟研究中,输运系数常采用Spitzer和Braginskii的公式.我们知道Spitzer和Braginskii的公式适合于完全电离的非简并等离子体,即低密度、高温等离子体.对于高密度或低温简并等离子体,常给出不正确的结果,有时相差1沪的数量级.
Perspective of Galactic dark matter subhalo detection on Fermi from the EGRET observation
dark matter substructures gamma-rays Fermi telescope
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2009/9/9
The perspective of the detectability of Galactic dark matter subhaloes on the Fermi satellite is investigated in this work. Under the assumptions that dark matter annihilation accounts for the ``GeV e...
1938年诺贝尔物理得奖主Enrico Fermi（图）
neutron irradiation new radioactive elements nuclear reactions slow neutrons
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2009/8/24
The Nobel Prize in Physics 1938, Enrico Fermi, for his demonstrations of the existence of new radioactive elements produced by neutron irradiation, and for his related discovery of nuclear reactions b...
Meson spectra governed by the Fermi-Breit potential
meson spectra Breit potential quark model
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2009/8/14
We calculate the meson mass spectra in a quark potential model by using the complete Fermi-Breit potential including the terms of orbit-orbit interaction, spin-orbit coupling, and tensor force interac...
Fermi—Dirac关联与Q－v)Kv(Q)分布
多重强子产生 强子发射源 Fermi-Dirac关联 Q－v)Kv(Q)分布
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2009/7/30
根据非微扰理论提出一种源分布─—Q－v)Kv(Q)分布.由此计算两质子的Fermi-Dirac关联.拟合的曲线与实验数据吻合得较好,这是Q－v)Kv(Q)分布比Gauss源分布优越之处.由全同质子的F—D关联计算出发射源半径及Fermi场的反常量纲.
热核表面能的Thomas–Fermi统计模型理论
热核 表面能 Thomas-Fermi模型
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2009/7/6
用Seyler-Blanchard动量相关非定域相互作用的含温Thomas-Fermi统计理论,对半无穷大核物质模型计算了核物质表面能系数σ(T,δ)随温度T和不对称度δ的变化,发现在低温T≤5MeV和不对称度δ≤0.2时,可以近似写成σ(T,δ)=σ0(T)[1+K(T)δ2],其中σ0(T)和K(T)可以拟合成温度T的二次函数.
NASA's Fermi Telescope Probes Dozens of Pulsars
NASA Fermi Telescope Pulsars
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2009/7/6
A pulsar is the rapidly spinning and highly magnetized core left behind when a massive star explodes. Most of the 1,800 cataloged pulsars were found through their periodic radio emissions. Astronomers...
推广的Thomas–Fermi方法中适用的新式核密度
核密度 ETF方法 EVM近似 核基态性质
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2009/6/10
给出一种适用于推广的Thomas-Fermi方法(ETF)的密度形式.取SkM势参量,对几个球形核的基态性质进行了计算,结果优于通常采用的多参数密度形式.用期望值方法(EVM)给出的基态能量能重现H—F的计算结果.
Self-initialised Fermi-1 acceleration by pitch-angle re-scattering of solar wind ions reflected from the parallel termination shock
anomalous cosmic ray process governing pick-up ions solar wind ions
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2009/5/27
In a recent kinetic calculation a rather high amount of reflected ions was shown to occur at the solar wind termination shock under a parallel magnetic field orientation. The fate of these reflected i...
FERMI'S PARADOX - THE LAST CHALLENGE FOR COPERNICANISM?
Astrobiology Extraterrestrial intelligence Galaxy: evolution History and philosophy of astronomy
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2010/10/29
We review Fermi's paradox (or the "Great Silence" problem), not
only arguably the oldest and crucial problem for the Search for ExtraTerrestrial
Intelligence (SETI), but also a conundrum of profound...
相对论Thomas-Fermi近似下的核半径公式
核半径公式 Thomas-Fermi近似
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2009/5/22
使用QHD-I的相对论核场论模型,在Thomas-Fermi近似下讨论核力作用半径公式 R=R0A1/3,发现理论计算R0的结果与高能α粒子与原子核散射的实验结果很好地符合.
ADAPTATIONISM FAILS TO RESOLVE FERMI’S PARADOX
Astrobiology-Extraterrestrial inteligence
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2009/3/2
One of the most interesting problems in the nascent discipline
of astrobiology is more than half-century old Fermi's paradox: why, considering
extraordinary young age of Earth and the Solar System i...
Fermi能区核–核碰撞的平衡前中子发射
原子核 碰撞 中子发射
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2008/1/26
利用BUU模型模拟核-核碰撞36Ar+108Ag(35Mev/u)、14N+108Ag(35MeV/u)中的平衡前中子发射.模拟结果与唯象的运动源拟合给出的中等速度源成份相吻合.这说明中等速度源成份产生于核-核碰撞的早期,对应平衡前发射.并从级联碰撞的角度定量地研究了平衡前发射的持续时间.
用Fermi-Thomas方法计算金属的结合能
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2007/12/12
本文用Fermi-Thomas方法计算了金属的结合能。得到初步结果:金属的能量舆晶格常数的关系中,有一极小值。此极小值所对应的原子间距对重金属舆实验值相近,而对单价碱金属则理论值太小。所得结合能的数值较实验值大很多。作者认为这是由於F.T.方法应用到原子上所存在的误差所引起的,而不是在金属内应用的误差所引起的。
Instability of Non-Fermi Liquid Behavior in the Two-Channel Kondo
Model
Non-Fermi liquid Kondo model
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2007/8/15
2001Vol.35No.5pp.621-626DOI:
Instability of Non-Fermi Liquid Behavior in the Two-Channel Kondo
Model
YUAN Qing-Shan,1,2 CHEN Hong1 and ZHANG Yu-Mei1
1 Pohl Institute of ...