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截断     
相关语句
  truncation
    s' Boson and the S-D Truncation in the IBM
    s'玻色子与相互作用玻色子模型中的S-D截断
短句来源
    Dynamics of Many-Body Correlation Green's Functions——Ⅲ. Truncation with Respect to Crder
    多体关联Green函数动力学——Ⅲ.截断近似
短句来源
    It is shown that w, θ0 and M2 factors derived by the different definitions are not equal which also depend on the truncation parameter a/w0 (a-half width of the aperture, w0-waist width of the FGB).
    结果表明:按不同束宽定义得到的截断平顶高斯光束的w、θ0和M2因子不同,且与截断参量a/ w0(a为光阑半宽度,w0为平顶高斯光束初始束腰宽度)有关.
短句来源
    Extended Painleve Nonstandard Truncation Expansion And Exact Solutions of 2 + 1 Dimensional Broer - Kaup Equation
    2+1维Broer-Kaup方程推广的Painlevé非标准截断展开和精确解
短句来源
    Effect of Truncation Parameter on Focal Shift and Focal Switch
    截断参数对焦移量和焦开关的影响
短句来源
更多       
  cutoff
    A NEW METHOD FOR DETECTION OF THE ELECTRON TEMPERATURE IN LASER-PLASMA SHORT WAVE CUT OFF STIMULATED RAMAN SCATTERING SPECTRUM
    探测激光等离子体电子温度的一种新方法受激Raman散射光谱的短波截断
短句来源
    Progams were developed to calculate the transmission properties of one-dimensional and two-dimensional photonic crystals, which use the perfectly matched layer to cut off the boundary of space.
    采用完全匹配层(PML)吸收边界条件来截断计算区域,编制了一维光子晶体传输特性的数值计算程序以及二维正方晶格光子晶体传输特性的数值计算程序。
短句来源
    After introducing the cutoff function v(k) = exp.
    在采用截断函数v(k)=exp.
短句来源
    A method for the boundary cutoff based on the expectational energy of the system is suggested, which is suitable to the calculations for the eigen-functions and -energies of the vibrational levels of diatomics.
    介绍了一种基于系统平均能量的截断方法, 在求解双原子分子振动的本征波函数Ψn 和本征振动能量En 的过程中, 采用基于系统平均能量的边界截断较为适宜.
短句来源
    The black hole entropy is calculated which is proportional to the horizon area only with a appropriate geometrical cutoff relationship.
    得到了黑洞熵,只当取某一特定的截断关系该熵才正比于黑洞的视界面面积。
短句来源
更多       
  truncate
    The scattering field can be computed by using the perfectly matched layer(PML) to truncate the computing field in the transverse plane.
    利用完全匹配层(PML)截断计算边界;
短句来源
    FEM is of capability to model inhomogeneous materials as well as complicated structures, and its coefficient matrix is sparse, however it requires an artificial boundary condition to truncate the computational grid.
    有限元法公式简单,能够灵活地模拟非均匀介质和复杂结构,形成的系数矩阵是稀疏的带状矩阵,但是它必须在截断边界处设置人工边界条件。
短句来源
    Also, in this paper, some truncated conditions, which are used to truncate the solving region in FEM in order to decrease the unknown, are introduced such as Absorbing boundary conditions(ABC), perfectly matched layer(PML) and Finite Element-Boun-dary Integral Methods(FEM-BI).
    本文还研究了有限元方法的几种截断边界:吸收边界条件,完全匹配层以及有限元-边界积分方法。
短句来源
    In this case, we need to truncate the domain to obtain a finite domain for performing numerical calculations.
    在这种情况下,我们需要将这无限的区域截断成有限的区域来进行数值计算。
短句来源
    For this purpose, we introduce the so-called Perfectly Matched Layers (PMLs) to truncate unbound domains.
    为此,我们引进了所谓的完美匹配层(PMLs)来截断无限区域。
短句来源
更多       
  truncating
    In chapter four, on truncating the one way wave equation and approximating partialderivatives in it at fourth order, a kind of two dimensional fourth order ABC is derived inCartesian system and circular cylindrical system respectively.
    在第四章中将频域单向波方程截断到四阶,并用具有四阶精度的中心差分近似其中的偏导数,得到了直角坐标系和圆柱坐标系中的二维四阶吸收边界条件。
短句来源
    Adopting connected graphs as independent graphs, the(2+1)-D SU(3) 0++ glueball wavefunction is calculated using scheme of truncating eigenvalue equations. Received 30 March 1998
    采用截断本征方程的方法,选择连接图作为独立图,计算(2+1)维SU(3)胶球波函数,其μ_0~F和μ_2~F表现出较好的标度行为.
短句来源
    The method of trUncating eigenvalue equations is used to study glueballmass and glueball wavefunchon. The results of calculahon are (1) the fifth orderglueball mass shows no good convergent behavior as uo of fifth-order vacuum wave- function. At region 1/ g2 > 0.8, the glueball mass descends gedully.
    采用截断本征方程的方法研究2+1维SU(2)格点规范场的胶球质量及胶球波函数.计算结果表明:五阶胶球质量m/e2与五阶真空波函数的一样没有表现出良好的收敛行为,在1/g2>0.8区间,胶球质量逐渐下降。
短句来源
    The calculations are based on the transfer matrix method and a truncating approximation.
    采用了转移矩阵方法和截断近似技术 .
短句来源
    The finite difference time domain (FDTD) computational zone was truncated by an artificial boundary, of which the geometric shape was conformal with the boundary of an arbitrary shaped scatterer. The external conformal mesh was generated by the Thompson transformation. On the truncating boundary, the time domain measured equations of invariance (MEI) were applied as a local absorbing boundary condition.
    利用 Thompson变换在任意形状的散射体外部产生共形的外部计算网格 ,并使 FDTD计算区域的截断边界与散射体边界形状完全一致 ,时域不变性测试方程 (MEI)方法被作为该截断边界上的局域吸收边界条件 ,从而大大压缩了 FDTD的计算空间 .
短句来源
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      truncation
    An Estimation of the Truncation Error for the Two-Channel Sampling Formulas
          
    The aim of the article is to obtain an estimation for the truncation error in the
          
    This resulted from the truncation error between the numerical solution and exact solution of the Reynolds stress equations.
          
    Truncation fragments of the α subunit were screened for interactions against these two substrate fragments.
          
    Significant and escalating truncation of the redusome DNA causes cell aging due to an arising and increasing deficit of fRNAs and, for this reason, the lack of required ions near certain structural genes.
          
    更多          
      cutoff
    Let Γ be a smooth compact convex planar curve with arc length dm and let dσ=ψ dm where ψ is a cutoff function.
          
    The short-wave cutoff boundary of the capillary wave spectrum is established.
          
    Thus, as the particle concentration increases, the central jump in compression [shock wave] moves in the direction of the nozzle cutoff, while the Mach number on the axis of the jet in front of the forward jump diminishes.
          
    The results of an experimental study of a flow of rarefied gas of density ~10-5 g/cm3 beyond the cutoff of a hypersonic nozzle (M?11) by means of an electron beam with energy up to 43 keV are presented.
          
    A study is made of the propagation of three-dimensional acoustic perturbations in a two-dimensional gas flow in axisymmetric channels of variable cross sectional area at frequencies near the cutoff frequency.
          
    更多          
      truncate
    truncate Cobb 1920) by having a longer body, longer cephalic setae, and a wide amphid equal to the respective body diameter.
          
    truncate by the distinct striation of the cuticular annulations.
          
    All the four species possess a similar mesosomal sculpture, coarse on the mesoscutum and more or less striate on the scutellum, and the solid clava obliquely truncate at apex.
          
    A multi-layer checkerboard is used to truncate a waveguide in the FDTD simulation; the result is comparable to that of an unsplit Perfectly Matched Layer (PML) with the same number of layers.
          
    The time domain measured equations of invariance (MEI) is applied to truncate computational boundary by the first time in Thompson-FDTD algorithm.
          
    更多          
      truncating
    The PML technique is used to deal with the difficulty on truncating the unbounded domain while the DSC algorithm is utilized for the spatial discretization.
          
    The arbitrariness in the way of truncating a cone manifests itself in the possibility of adding various harmonic polynomials.
          
    Using the boundary truncating technique, the solution process of Finite-Element Method (FEM) has been greatly simplified compared with other hybrid methods.
          
    A novel stop mutation truncating critical regions of the cardiac transcription factor NKX2-5 in a large family with autosomaldom
          
    Search for truncating mutations or CAG repeat expansion in CACNA1A was negative.
          
    更多          


    The branching ratios of the decay of the hyperons, the ratios of the mean life times of the decay of various hyperons and the ratios of the life times of the hyperons to that of the K+ -meson are calculated by using the universal Ferm weak interaction proposed by Feynman and Gell-Mann and the strong interaction proposed by Salam. The perturbation theory is used with a cut off in the region of large momentum. By using the coupling constants of the strong interaction given by Warner and choosing suitable values...

    The branching ratios of the decay of the hyperons, the ratios of the mean life times of the decay of various hyperons and the ratios of the life times of the hyperons to that of the K+ -meson are calculated by using the universal Ferm weak interaction proposed by Feynman and Gell-Mann and the strong interaction proposed by Salam. The perturbation theory is used with a cut off in the region of large momentum. By using the coupling constants of the strong interaction given by Warner and choosing suitable values for the other two coupling constants remaing to be fixed most of the results of our calculation agree fairly well with the experiments. The worst result differs from the experimental Values at most by

    本文应用了费曼和盖尔曼所提出的普适费米弱相互作用和同位旋守恒的强相互作用计算了各种超子、K介子衰变的分枝比和平均寿命的比例。在计算时应用了微扰论,并在大动量处将相互作用截断。在应用了查尔斯·瓦纳所给出的相互作用常数和对其余两个常数作了一定的选择之后,得到的分枝比和平均寿命之比大部分和实验结果符合,最坏相差一个因子二。如果选择本文所采用的相互作用常数,可以改进前一篇源文中K~+介子分枝比计算结果和实验的符合程度。 本文计算表明V-A普适弱相互作用确实适用于K分子和超子衰变现象,表明在解释这些现象时,必须考虑到“很强”和“较强”两类强相互作用所分别产生的影响。此外,本文还表明Λ和∑应具有相同的相对宇称,K分子和核子、超子之间的四种强相互作用中必须至少有一对是膺标量耦合。

    ~~

    本文行算了 K~+介子下列三种衰变形式的分枝比:K~+→μ~++π~ο+γK~+→e~++π~ο+γK~+→μ~++γ计算利用了费曼(Feynmann)等人所提出的普适费米(Fermi)弱相互作用的理论,并用了微扰论方法和截断法,得到的分枝比是1:1.5:12,这与实验1:1:15符合得很好。文中指出,费米弱相互作用的别的组合不能给出与实验相符的结果。

    Formulas for the nucleon electromagnetic form factors are derived in the static theory.After introducing the cutoff function v(k) = exp.{-(1/2)(k/K)n} and choosing the parametersK = 5.6, n = 3, the correct values of the isotopic vector parts of nucleon total charge, anomalous magnetic moment and mean square radius are obtained, assuming no contribution comes from the nucleon core. The resulting F2v, is in agreement with the earlier experimental curve corresponding to the exponential distribution model, but F1v...

    Formulas for the nucleon electromagnetic form factors are derived in the static theory.After introducing the cutoff function v(k) = exp.{-(1/2)(k/K)n} and choosing the parametersK = 5.6, n = 3, the correct values of the isotopic vector parts of nucleon total charge, anomalous magnetic moment and mean square radius are obtained, assuming no contribution comes from the nucleon core. The resulting F2v, is in agreement with the earlier experimental curve corresponding to the exponential distribution model, but F1v agrees with the experimental result only for small values of q2. The possible physical explanation of cutoff function is discussed.

    本文推导了用静止理论直接计算核子形式因子的公式.在采用截断函数v(k)=exp.{-1/2(k/k)~n}并选择参数k=5.6,n=3之后,得到了正确的同位旋矢量部分的核子总电荷、反常磁短和均方半径的数值而无需外加核子核心的贡献,F_(2v)的计算结果和以前根据指数分布模型的实验曲线一致,而F_(1v)曲线仅在小q~2处与实验相符.最后并讨论了截断函数的可能的物理解释.

     
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