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核能级
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  nuclear energy level
     Electrodiposited WO 3 film exhibits reversible photochromism and electrochromism (blue light absorption appears around the infrared area) The film's W4f nuclear energy level on different color lever is observed through XPS and the results show that after color development the range of W4f nuclear energy level becomes wider Photo electrochemical test results show that the film possesses a lower photoelectric transformation efficiency (14 refs )
     电沉积WO3薄膜显示出可逆光致变色及电致变色行为(在红外区域附近具有蓝色光吸收)。 通过X射线光电子能谱(XPS),对WO3薄膜在不同呈色水平上的W4f核能级作了观察研究,可见W4f核能级在WO3膜显色后变宽,光电化学测定表明WO3薄膜具有低光电转换效率。
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     The key application of the method of analogy in nuclear physics is discussed from the viewpoint of history of physics and methodology,using the theories of nuclear energy level,β decay and meson as example.
     以核能级、β衰变和核力的介子理论为例 ,从物理学史和方法论的角度论述了类比在核物理中的重要应用
短句来源
  nuclear level
     DRAWING OF NUCLEAR LEVEL SCHEME
     核能级纲图绘制
短句来源
     Nuclear Level Density Phenomenological Expressions and Its Parameters
     核能级密度的唯象表示及其参数
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     PREND code of drawing nuclear level scheme is developed by adding codes PSC and PSC -1for printing the scheme which is drawn by PREND on the printer and laserjet.
     移植了绘制核能级纲图程序PREND。 研制了把PREND绘制的核能级纲图在宽行打印机和激光打印机上再现的程序PSC和PSC-1。
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  nuclear energy levels
     The quadrupole hyperfine splitting of nuclear energy levels and the fundamentalprinclple of nuclear quadrupole resonance(NQK)are described,and the origin of electric fieldgradient(EFG ) tensor located at atomic nucleus is discussed, which is involved closely withthe applications of EQR.
     简述核能级的电四极超精细分裂及核四极共振基本原理,并就与核四极共振应用密切有关的、四极核所在处电场梯度(EFG)张量的来源进行讨论。
短句来源
     A plunger system used to measure ns-ps range lifetimes of the nuclear energy levels is intreduced in this pa-per.
     本文介绍了测量ns~ps量级核能级寿命的plunger装置及对其有关性能的初步测试。
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  “核能级”译为未确定词的双语例句
     Exciting Level Energy of Nuclear ~6Li and ~7Li In Reactions of Stripping and Capturing
     核子削裂与拾取反应中~6Li 和 ~7Li 核能级的激发
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     The examples of ̄(197)Tl εdecay and ̄(61)Mn β ̄- decay are given for illustrating their performance.
     以 ̄(197)Tlε衰变和 ̄(61)Mnβ ̄-衰变的核能级纲图为例,说明其性能。
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     MEASUREMENT OF SOME LEVEL-WIDTHS IN ~(40)Ca BETWEEN 9.5 AND 10.5 MEV
     对~(40)Ca9.5—10.5MeV能区内几组核能级宽度的测量
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     Measurement of short lifetime of nuclear states for ~(24)Mg and ~(40)Ca with the resonance γ absorption method
     用γ共振吸收方法测定~(24)Mg、~(40)Ca等核能级的短寿命
短句来源
     The total widths of two excited states at 9603.9 keV, 10321.0 keV and of a doublet at 9864.6, 9868.8 keV in 40Ca have been measured with resonance y-ray absorption. The gamma radiations from 39K (p, γ) reaction at E_P=1307.2 keV, 2042.8 keV and 1595.0 keV have been selected to excite the corresponding levels in 40Ca.
     本文介绍了用γ共振吸收法测量~(40)Ca 9603.9keV,10321.0keV两组能级和9864.6,9868.8keV一组双重态能级的能级宽度,选用~(39)K(p,γ)反应所放出的γ射线激发相应的~(40)Ca吸收核能级
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  nuclear energy level
Vysotskiet al., the T1/2 value must increase if a γ-active nucleus is surrounded by many identical ground-state nuclei, because these distort the spectrum of electromagnetic vacuum oscillations near the nuclear energy level.
      
In particular, we derive expressions for the nuclear energy level splittings incorporating both magnetic and electric quadrupole interactions, using second-order perturbation theory.
      
  nuclear level
The experimental data from measurements of the decay kinetics of the low-lying nuclear level 6.238 keV of the stable isotope 181Ta, which were obtained on two experimental laser systems, are presented.
      
The calculated values of the half-life of the nuclear level Eγ = 35.492 keV in 125TeQ ions (Q = 45-48) are in good agreement with the measured quantities.
      
An interpretation of the effect observed is proposed on the basis of the idea of dynamic synchronization of oscillations between a nuclear level and a standing wave of M?ssbauer radiation.
      
Due to the virtual photon exchange between atomic nuclei and the field of zero-point electromagnetic oscillations, some nuclei of a given sample are in a virtual excited state with the lifetime ~?/E, where E is the energy of nuclear level.
      
The resonance absorption of solar axions by 7Li nuclei, which is accompanied by the excitation of the first nuclear level of lithium a + 7Li → 7Li* → 7Li + γ, is sought.
      
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  nuclear energy levels
Resonance strengths, branching ratios and mean lifetimes of nuclear energy levels in23Na
      
Fluctuation properties have been analyzed for a large collection of low-lying nuclear energy levels, with emphasis on the nearest-neighbor spacing distributions.
      
The Fourier transform as a signature for chaos in nuclear energy levels
      
Absolute precision measurements of nuclear energy levels and their breadths in terms of fundamental atomic constants
      
On the other hand, synchrotron-based M?ssbauer spectroscopy is applied to an oriented iron island structure in order to obtain information on the strength and direction of the magnetic fields from the nuclear energy levels.
      
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The angular distribution and differential cross-section of the proton groups from the C12(d, p)C13 and Ca40(d, p)Ca41 ground state reactions have been measured at the deu-teron energy of 13.3 MeV. Measurements were made at 2.5° or 5° intervals and covered the angular range from 3° to 167° and from 10° to 164° for the C12 and Ca40 reactions respectively. It is found that: (1) The experimental points near the main stripping peak agree fairly well with the theoretical angular distribution curve calculated by using...

The angular distribution and differential cross-section of the proton groups from the C12(d, p)C13 and Ca40(d, p)Ca41 ground state reactions have been measured at the deu-teron energy of 13.3 MeV. Measurements were made at 2.5° or 5° intervals and covered the angular range from 3° to 167° and from 10° to 164° for the C12 and Ca40 reactions respectively. It is found that: (1) The experimental points near the main stripping peak agree fairly well with the theoretical angular distribution curve calculated by using the simple Butler theory and normalized at the stripping peak, for both proton groups. The parameters of the nuclear levels thus determined are in good accord with the results previously obtained. (2) For large angles, the experimental cross-sections do not decrease to such small values as required by the Butler theory. They also show very prominent subsidiary maxima at the positions not in accord with the prediction of the Butler theory. These features can be interpreted by the distorted wave theory, but may also be partly due to contributions of reaction mechanisms other than the deuteron stripping. (3) In the C12(d, p)C13 reaction, the cross-section decreases strongly at the forward angle and shows an uprising at the backward angle. Neither of these features is in accord with the Butler theory, but they can also be explained by the distorted wave theory. The uprising at the backward angle may also be due to contributions of other reaction mechanisms. (4) The reduced widths of the ground levels for the C12(d, p)C13 and Ca40(d, p)Ca41 reactions, obtained from the peak cross-sections by using the Butler theory are γ2 = 0-17 and 0.041 respectively. The distorted wave theory gives larger values which will be closer to the values expected from the single particle model. Owing to these facts, it seems worthwhile to analyze the data of the present experiment with the detailed distorted wave theory.

本实验测量了C~(12)(d,p)C~(13)及Ca~(40)(d,p)Ca~(41)基态反应质子群的角分布和微分截面。氘核能量为13.3MeV,对C~(12)和Ca~(40)的反应,其测量角度范围分别为3°—167°和10°—164°,每隔2.5°或5°测量一点,其主要结果如下:(1)对于这两群质子,在主削裂峯附近的实验点和用简单Butler理论算得的理论角分布曲线都符合得相当好;理论计算数据对实验数据在主峯处归一;由此而定得的核能级参数与前人所得到的是一致的。(2)大角度区的实验截面数值没有减小到象Butler理论所要求的那样小,并有非常明显的次极大出现,其位置与Butler理论所预言的不一致;这些特点可以用扭曲波理论来解释,非氘核削裂机制也可能有部分贡献。(3)在C~(12)(d,p)C~(13)反应中,前角度区的截面有很大下降,而后角区则有明显的增加,这些现象都和Butler理论不一致;然而,这也可以用扭曲波来解释。(4)用主峯处的截面和Butler理论算得的基态的约化宽度,对C~(12)(d,p)C~(13)和Ca~(40)(d,p)Ca~(41)反应分别为r~2=0.17和0.041;...

本实验测量了C~(12)(d,p)C~(13)及Ca~(40)(d,p)Ca~(41)基态反应质子群的角分布和微分截面。氘核能量为13.3MeV,对C~(12)和Ca~(40)的反应,其测量角度范围分别为3°—167°和10°—164°,每隔2.5°或5°测量一点,其主要结果如下:(1)对于这两群质子,在主削裂峯附近的实验点和用简单Butler理论算得的理论角分布曲线都符合得相当好;理论计算数据对实验数据在主峯处归一;由此而定得的核能级参数与前人所得到的是一致的。(2)大角度区的实验截面数值没有减小到象Butler理论所要求的那样小,并有非常明显的次极大出现,其位置与Butler理论所预言的不一致;这些特点可以用扭曲波理论来解释,非氘核削裂机制也可能有部分贡献。(3)在C~(12)(d,p)C~(13)反应中,前角度区的截面有很大下降,而后角区则有明显的增加,这些现象都和Butler理论不一致;然而,这也可以用扭曲波来解释。(4)用主峯处的截面和Butler理论算得的基态的约化宽度,对C~(12)(d,p)C~(13)和Ca~(40)(d,p)Ca~(41)反应分别为r~2=0.17和0.041;用扭曲波理论计算时,则得到较大的r~2值,后者更接近于单粒子模型所预言的数值,基于上面这些事实,对本实验的数据使用扭曲波理论来进行分析似乎是值得的。

The total widths of two excited states at 9603.9 keV, 10321.0 keV and of a doublet at 9864.6, 9868.8 keV in 40Ca have been measured with resonance y-ray absorption. The gamma radiations from 39K (p, γ) reaction at E_P=1307.2 keV, 2042.8 keV and 1595.0 keV have been selected to excite the corresponding levels in 40Ca. The accurate results for the widths of the 9603.9 keV and 10321.0 keV states are obtained for the first time, they are 188±47eV and 91±15eV, respectively. For the 9864.6 and 9868.8 keV states, they...

The total widths of two excited states at 9603.9 keV, 10321.0 keV and of a doublet at 9864.6, 9868.8 keV in 40Ca have been measured with resonance y-ray absorption. The gamma radiations from 39K (p, γ) reaction at E_P=1307.2 keV, 2042.8 keV and 1595.0 keV have been selected to excite the corresponding levels in 40Ca. The accurate results for the widths of the 9603.9 keV and 10321.0 keV states are obtained for the first time, they are 188±47eV and 91±15eV, respectively. For the 9864.6 and 9868.8 keV states, they are 100±24eV and 899±214 eV. Because the 9864.6 and 9868.8 keV states are close-lying doublet, the resonance γ-ray absorption techniqque was used in a special style: there will be two groups of gamma rays to be used to excite the same two levels, so the cross excitation occurs. We extended the corresponding exper mental analysis. In addition, (p,γ) yield measurenents have been made to extract the level widths of the 9603.9 keV, 10321.0 keV states. And the results are in agreement with the values deduced from resonance γ-ray absorption. The (p, γ) resonance strengths and isospins of the 9603.9 keV and 10321.0 keV states in 40Ca have also been discussed.

本文介绍了用γ共振吸收法测量~(40)Ca 9603.9keV,10321.0keV两组能级和9864.6,9868.8keV一组双重态能级的能级宽度,选用~(39)K(p,γ)反应所放出的γ射线激发相应的~(40)Ca吸收核能级。对于9603.9keV,10321.0keV的能级宽度,这里给出了比较精确的结果,相应的能级宽度分别为T=188±47eV,T=91±15eV。对于9864.6,9868.8keV能级,结果为T=100±24eV,T=899±214eV,由于~(40)Ca 9864.6,9868.8keV两能级靠得很近,因此这里用γ共振吸收法测量它们的能级宽度与以往有所不同,将同时有两组γ射线用来激发同样两个能级而发生交叉激发。我们对相应的实验处理方法作了推广。此外,用(p,γ)共振产额法测量了~(40)Ca 9603.9keV,10321.0keV能级宽度,得到了与γ共振吸收法一致的结果。本文还对~(40)Ca 9603.9keV,10321.0keV能级的(p,γ)共振强度S_(pγ)、同位旋T等进行了讨论。

'We take 15 MO model of Weaver et al. as initial model,the collapse process of stellar core between the onset of collapse and core bounce has been calculated by using the eouation of state of us (EOSⅡ).With the simplified nuclear statistical equilibrium system mentioned above, the treatment of the thermal effects of neutronization, nuclear disintegration, nuclear combination and nuclear excitation has been attemped.The results of us are essential agreed with Van Riper's results.calculated by using the ILPR's...

'We take 15 MO model of Weaver et al. as initial model,the collapse process of stellar core between the onset of collapse and core bounce has been calculated by using the eouation of state of us (EOSⅡ).With the simplified nuclear statistical equilibrium system mentioned above, the treatment of the thermal effects of neutronization, nuclear disintegration, nuclear combination and nuclear excitation has been attemped.The results of us are essential agreed with Van Riper's results.calculated by using the ILPR's equation of state for the same initial model.As the center density of core reaches 1014gcm-3, the maximum velocity of fall and the Ms (mass at sonic point)in model D is greater than that of the typical model of Van Riper by 2.7% and 7% respectively. In model D the neutrino trapping density is less than that of the typical model of Van Riper by 3% (at mass layer 0.15M ) but the lepton fraction in model D is greater than that of typical model of Van Riper by 8%(at 0.15M ) and by 10% (at 0.5M ).

本文用文[17]所提供的物态方程等输入物理因素,以Weaver等的质量为15M_☉的恒星演化模型为初始模型,对恒星坍缩过程作了数值计算,计算至中心密度为10~(14)gcm~(-3)。在由平均重核,α粒子及自由核子组成的简化核平衡系统基础上,对核的裂解与复合、重核能级激发及电子俘获使物质中子化等过程热效应的处理作了尝试。计算结果表明,我们的结果(用EOS(Ⅰ)态方程)与Van Riper等(用LLPR物态方程)的典型模型(非相对论)结果很接近。当中心密度ρ(?)达1.0×10~(14)gcm~(-3)。最大坍缩速度为3.8×10~9cm sec~(-1),相似区质量M_s为0.61M_☉较Van Riper典型模型值分别大2.7%和7%。在质量壳0.15M_☉及0.5M_☉,相应的中微子俘陷密度ρ_(tr?p)为1.55×10~(11)及1.8×10~(11)g cm~(-3),较VanRiper值分别小3%及10%,而相应的轻子浓度为0.387及0.386较VanRiper分别大895及10%。

 
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