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symmetry     
相关语句
  对称性
     Symmetry Studying on the Discrete Hopfield Model Neural Networks
     离散Hopfield模型神经网络的对称性研究
短句来源
     Symmetry in DNA and Analysis of Eukaryotic Cis-Regulatory Module
     DNA序列的对称性与真核基因调控元件模块的分析
短句来源
     Symmetry Based Modelling and Control of Infinite Dimensional Quantum Mechanical Systems
     基于对称性的无穷维量子力学系统的建模与控制问题研究
短句来源
     Study on κ Symmetry and Integrability of AdS String and Related Research
     AdS弦的κ对称性与可积性及相关研究
短句来源
     Crystal-Field Symmetry Method for the Study of the Spectroscopic and Magnetic Properties of Rare-Earth Doped Laser Crystals
     晶场对称性方法研究稀土激光晶体的光谱和磁学性能
短句来源
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  对称
     Symmetry Classes of Tensors and Induced Modules
     张量对称类与诱导模
短句来源
     The Symmetry Property of the General Covariant Equation
     广义协变方程的对称性质(研究简讯)
短句来源
     MESON RESONANCE AND THE UNITARY SYMMETRY THEORY
     介子共振态与么正对称理论
短句来源
     THE U(6) SYMMETRY AND A NEW STRATON SCHEME
     U(6)对称和新的层子方案
短句来源
     Weak-Electromagnetic Unification and Broken S_4 symmetry
     左右对称的弱电统一理论与S_4对称破缺
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  匀称
     Its formal and thematic charm lies in its structural symmetry, the fullness of its characterization, the accurate reflection of its cultural milieu and the embodiment of traditional western culture.
     它的魅力主要体现在 :小说结构匀称 ,人物性格丰满 ,反映时代文化语境 ,传承西方传统文化等。
短句来源
     In this study 2O indices of physisal development including height,body weight,symmetry of physical development and so on were measured on 2 250 soldiers.
     本研究测定了2250名战士的身休发育指标20余项,其中包括身高、体重、身体发育匀称度等。
短句来源
     Designs of the layout must follow some easthetic principles which includes harmony,symmetry,variety and rhethm.
     风格迥异、版式新颖的报纸版面设计必须遵循一定的审美原则,这些原则包括和谐、匀称、多样、韵律,等等。
短句来源
     Through analyzing the investigation and research data of 1200 students' physique , the author sifts the index which reflect the standard of their physical shape growth, takes step regression analysis, and sets up two dimensions regression formula to evaluate the physical shape symmetry of those students, compares these formula with other evaluation formula introduced in some documents, and try to approach accuracy of prediction.
     通过对1 200名中、小学生体质调研数据的主成分分析,筛选出反映身体形态发育水平的指 标,然后,进行逐步回归分析,建立评价学生身体形态发育匀称度的二元回归方程,并对所 建方程与有关文献提出的评价方程进行了对比分析,探讨两类回归方程的预测精度。
短句来源
     Verveak index showed that the body substantial degree and symmetry degree of the MR student was satisfing.
     维尔维克指数反映出智力落后学生的身体充实度和匀称度较好。
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  对称度
     As a result,a working curveR/L vs.T_x have been plotted by using the symmetry of 400 diffraction profileR/L=1 as starting point and the maximum value of R/L as terminal point.
     在此基础上,以400衍射峰对称度R/L=1(R/L 为衍射峰高角一侧与低角一侧宽度之比)为原点,R/L 最大值为终点,作R/L~T_x 工作曲线。
短句来源
     The radial and axial displacements of spherical arc center are primary reason for form error, and spherical symmetry error respectively.
     球面圆弧中心径向位移是工件产生球面轮廓形状误差的主要原 因,而球面圆弧中心轴向位移则是球面产生球形对称度误差的主要原因。
短句来源
     Symmetry Recognition in Design for Assembly
     可装配性设计中的零件对称度的自动识别
短句来源
     Symmetry of both palpebral fissure: Horizontal watch 92.31% symmetry, up-watch 61.54% symmetry;
     双睑裂对称度:平视时92.31%对称,上视时61.54%对称;
短句来源
     An analysis of the keyway symmetry error evaluation methods
     键槽对称度误差的评定方法分析
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      symmetry
    Symmetry properties and cocycle properties of the Maslov index are then easily obtained.
          
    Unfortunately, several desirable properties are not available with compactly supported orthogonal wavelets, e.g., symmetry and piecewise polynomial structure.
          
    New symmetry and operational properties of the Fourier transform are derived.
          
    For a differential equation, a theoretical proof of the relationship between the symmetry and the one-parameter invariant group is given: the relationship between symmetry and the group-invariant solution is presented.
          
    The computation of symmetry-breaking bifurcation points inZ2×Z2-symmetric nonlinear problems
          
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    By replacing the fifth postulate in the preceding paper with the condition of spherical symmetry of space we again obtain the Friedmann universe in relativistic cosmology.

    将前文中第五个假定改为“空间具球面的对称性”后我们仍遵出费烈特猛宇宙。

    A new approximation method is proposed in this article for the discussion of molecular structures,and this new method includes the two well-known theories,molecular orbital theory and electron-pair bond theory as two special cases.Let a molecule have n bonds and let the ith bond be described by the anti-symmetrical two-electron bond function ψ_i(v_(2i-1),v_(2i)).(If there exist one- electron,three-electron or many-electron bonds,they can be similarly described by the corresponding one-electron,three-electron...

    A new approximation method is proposed in this article for the discussion of molecular structures,and this new method includes the two well-known theories,molecular orbital theory and electron-pair bond theory as two special cases.Let a molecule have n bonds and let the ith bond be described by the anti-symmetrical two-electron bond function ψ_i(v_(2i-1),v_(2i)).(If there exist one- electron,three-electron or many-electron bonds,they can be similarly described by the corresponding one-electron,three-electron or many-electron bond func- tions.) Then the stationary state of the molecule is represented by the follow- ing wave function Ψ, where the summation is over all permutations of 1,2,……,2n except those within the interior of the functions,since each ψ_i is already anti-symmetrical.Obviously (2~n/((2n)/!))~(1/2) is the normalization factor. By quantum mechanics the energy of the molecule equals (1) here H_i,T_(ij) and S_(11)' are respectively the following three kinds of operators, (2) (3) (4) The third term of equation (1) is the exchange integral of electrons 1 and 1', while (1,2') is that of electrons 1 and 2'.According to the definition of bond functions,ψ_i may be written as (5) Substituting equation (5) into equation (1) and carrying out the integration over spin coordinates,we obtain (6) It can be easily seen from equation (6) that the combining energy of a mole- cule consists of two parts,one being the binding energy of the bonds represent- ed by the first term of equation (6),and the other being the interaction energy of the bonds denoted by the second term of that equation. If we choose certain functions φ_i~('s) involving several parameters and substi- tute them into equation (6),we may determine the values of those parameters by means of the variation principle. For the discussion of bond interaction energies,we develop a new method for the evaluation of certain types of three-center and four-center integrals.The interaction energy of a unit positive charge and an electron cloud of cylindrical- symmetry distribution may be written as (7) where (8) and R_0~2=a~2+b~2+c~2 The interaction energy of two electron clouds both of cylindrical-symmetry distributions with respect to their own respective axes is evaluated to be (9) (10) where is to sum over j from zero to the lesser value of n-2i and m, is to sum over i from zero to the integral one of n/2 and (n-1)/2,and is to sum over all cases satisfying the relation =m-j,while b_(n,n-2i) represents the coefficient of x~(n-2i) in the n th Legendre polynomial.

    本文在分子结构理论方面,作了下列两点贡献:首先建议了用双电子或多电子键函数作为近似基础,来计算分子的近似能量和近似电子云分布。这样计算得来的结果,一定会比用分子轨道理论或电子配对理论好,因为它更真实的反映了分子的化学性质,同时它也包括了后两者,而以它们为特例。我们得到了分子结合能的表示式,用表示式证明了分子结合能由两部分组成:一部分是键的结合能,另一部分是键与键间的作用能。其次是建议了一种新方法,把在计算化学键相互间的作用能中遇到的一些三中心和四中心积分,还原为容易计算的二中心积分。这方法比以往所用的好,因为它计算比较简单,同时限制性也小。

    The gabled lean-to mill bent is an irregular rigid frame. The classical methods, e. g., the method of least work, slope-deflection, etc., for the analysis of the rigid frame are too tedious to be accepted, because they are not only dependent on the solution of simultaneous equations, but also the difficulty in establishing the equations. The method of moment distribution for computing the stresses of the same structure is also tedious because there are a great number of joint rotations and displacements involving...

    The gabled lean-to mill bent is an irregular rigid frame. The classical methods, e. g., the method of least work, slope-deflection, etc., for the analysis of the rigid frame are too tedious to be accepted, because they are not only dependent on the solution of simultaneous equations, but also the difficulty in establishing the equations. The method of moment distribution for computing the stresses of the same structure is also tedious because there are a great number of joint rotations and displacements involving in the gabled lean-to mill bents.A new method, symmetry-antisymmetry method, for computing the stresses in symmetrical gabled lean-to mill bents is presented in this paper. The foundamental conception of this method is to determine the shape constants and load constants of the unsymmetrical Γ-shaped frame as a whole and to treat it as a single member in the analysis.

    關於披屋廠房排架的應力分析,目前已有不少切實可行的方法。但以這類排架內部組織的特殊,一般通用的基本方法,多不能為實際工作者赢得時間和精力的充分節約。本文目的,在提供一個分析對稱式斜頂披屋廠房拂架的簡便方法,予以適當修正,並可推廣應用於其他各種類型的披屋廠房排架。本法的主要特點是將排架中具有“Γ”形的曲桿當作一個基本構件,從而求出這個基本構件在兩端結點角變和位移以及荷載作用下的“形常数”與“載常數”;並將不對稱荷載件成“對稱的”與“不對稱的”兩種情形,使在分析計算過程中必須考慮平衡的結點數目诚至最少程度。

     
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