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正四面体     
相关语句
  regular tetrahedron
     A Recursively Configured Interconnection Network ──Regular Tetrahedron Recursive Network
     一种递归构造的互连网络──正四面体递归网络
短句来源
     The results show that the most stable P_(5)is the doublet state of b isomer evolved from regular tetrahedron P_4 while the most stable P~+_5and P~-_5 are the singlet state of e,j isomers evolved from square P_4,respectively.
     结果表明,最稳定的P5为由正四面体的P4演变来的b结构的二重态,P5+和P5-则为由正方形P4演变来的e结构(正四棱锥)和j结构(平面正五边形)的单重态.
短句来源
     The particularly active effect of Ni~(2+) was probably due to the capability of Ni~(2+) to form regular tetrahedron chelate compounds.
     Ni2+对ETS活性的特殊激活作用可能与其能形成正四面体结构的络合物有关.
短句来源
     The regular tetrahedron, hexahedron and octahedron can be stacked as corner-connected fractal stacking, and their self-similar proportional factors are 2, 2, 1.7712. When the regular icosahedra (a0) are stacked as corner-connected fractal stacking ,they (a0) may have relevant deformation to form the regular icosahedron of a higher order (a,).
     正四面体、正六面体、正八面体可以作共角顶分数维堆垛,自相似比例因子为2,2,1.7712。
短句来源
     This article introduces the application of imagery teaching method and presents the application of golden section coefficient and center of gravity about regular tetrahedron to butadiene π MO coefficient radio.
     通过提出丁二烯πMO系数比的黄金分割系数和正四面体重心规律的具体应用,用黄金分割关系求出丁二烯的πMO;
短句来源
更多       
  tetrahedron
     A general Sierpinski block generated by normal tetrahedron is constructed by making use of the contraction of identical mapping which meets the open set conditions,and finds out its Hausdorff dimension s=ln[4+6(n-1)]/ln(1/ε).
     构造了正四面体生成的一般Sierpinski块,利用满足开集条件的压缩自相似映射的性质,给出它们的Hausdorff维数s=ln[4+6(n-1)] ln(1 ε)。
短句来源
     A Variational Calculation of Equilateral Triangle H-3 and Tetrahedron H-4
     H_3正三角形和H_4正四面体结构的变分计算
短句来源
     A Recursively Configured Interconnection Network ──Regular Tetrahedron Recursive Network
     一种递归构造的互连网络──正四面体递归网络
短句来源
     Hausdorff measure of Sierpinski block generated by normal tetrahedron
     正四面体生成的Sierpinski块的Hausdorff测度
短句来源
     Hausdorff Dimension of Sierpinski Block Generated by Normal Tetrahedron
     关于正四面体生成的Sierpinski块的Hausdorff维数
短句来源
更多       
  normal tetrahedron
     Hausdorff measure of Sierpinski block generated by normal tetrahedron
     正四面体生成的Sierpinski块的Hausdorff测度
短句来源
     Hausdorff Dimension of Sierpinski Block Generated by Normal Tetrahedron
     关于正四面体生成的Sierpinski块的Hausdorff维数
短句来源
     A general Sierpinski block generated by normal tetrahedron is constructed by making use of the contraction of identical mapping which meets the open set conditions,and finds out its Hausdorff dimension s=ln[4+6(n-1)]/ln(1/ε).
     构造了正四面体生成的一般Sierpinski块,利用满足开集条件的压缩自相似映射的性质,给出它们的Hausdorff维数s=ln[4+6(n-1)] ln(1 ε)。
短句来源
     A general Sierpinski block generated by normal tetrahedron is constructed, and by constructing the covering sequence of the general Sierpinski block, upper bound of Hausdorff measure of the general Sierpinski block is obtained: Hs(V)≤6157a21-a3s糐B(1a2-12+34-2a+169a2〗s2(0.32≤a≤0.5).
     构造了正四面体生成的一般Sierpinski块,通过构造其覆盖序列,得到了一般Sierpinski块的Hausdorff测度的上界,即ss1a22,  Hs(V)≤61+34-2a+1657a2-121-a39a2  (0.32≤a≤0.5).
短句来源
  regular tetrahedral
     The formation mechanism of the body-centred regular tetrahedral structure of He+5 cluster is proposed. The total energy curve for this structure has been calculated by using a modified arrangement channel quantum mechanics method.
     在对He_5~+团簇离子的研究过程中,假设He~+离子与周围相邻的四个He原子相互作用可以形成正四面体中心结构的团簇离子He_5~+,利用改进的排列通道量子力学方法,对He_5~+正四面体中心结构划分为四个通道进行计算,得到了He_5~+团簇离子的能量曲线和结合能。
短句来源
     when the separation of two nuclei at the center and an apexis is 2.19 a 0 and the curve for the regular tetrahedral structure has a minimal energy -1.7777 a. u.
     正四面体结构在核间距为1.92a0时,体系有一能量极小值-1.7777a.u.。
短句来源
     We think that the H + 4 cluster can be formed in higher symmetric structures of the centered equilateral triangle structure and the regular tetrahedral structure by the interaction of H + with three hydrogen atoms under certain conditions.
     此文认为在一定的条件下,H+4团簇可能由一个氢核与三个氢原子相互作用而形成对称性较高的平面正三角形中心结构或正四面体结构。
短句来源
     This means that the He+5 cluster may exist with a strong binding energy in a body-centred regular tetrahedral structure stably.
     这表明,He_5~+能以比较强的结合能稳定存在于正四面体中心结构。
短句来源
     also when R is 1.55a 0 . These mean that both structures of H - 5may exist and the body-centred regular tetrahedral structure is more stable than another.
     说明H-5的这两种结构都可能存在,但正四面体中心结构较为稳定。
短句来源
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      regular tetrahedron
    The refined hydrogen positions obtained by single crystal neutron diffraction show that N-H bond lengths form a regular tetrahedron in an ammonium ion.
          
    It is shown that an ammonium ion polyhedron is the regular tetrahedron.
          
    In each molecule, four zinc atoms are held together by a central oxygen atom, which results in the formation of a regular tetrahedron.
          
    The second method by Silverman and Linsker assigns to each letter a vertex of a regular tetrahedron in space, and this can be generalized to any dimension.
          
    Ray tracing four spheres at the vertices of a regular tetrahedron
          
    更多          
      tetrahedron
    This paper provides the complete proof of the fact that any planar cubic graph is at most single-bend embeddable except for the tetrahedron.
          
    Only polyhedra characterizing the structure of unstable water clusters that absorbed six or seven CO2 molecules demonstrate a nonsphericity close to the ideal tetrahedron.
          
    In the quaternary systems, the glass formation regions are situated close to the corresponding planes of the composition tetrahedron.
          
    The trimeric, tetrameric, and pentameric Tc clusters exhibit the equilibrium structures of isosceles triangle, tetrahedron, and square pyramid, respectively.
          
    The coordination polyhedron of the Sn atom (the SnC2S2 core) is a distorted tetrahedron.
          
    更多          
      其他


    The crystal of ammonium bicarbonate belongs to orthorhombic system with symmetry 3L2 3PC. They exist in three forms: prismatic, slaty or particle shape. The crystals appear colorless to white or light grey, transparent to semitransparent. The cleavage parallel to (110) is perfect. Hardness H=1.55. Density D= 1.573 g/cm3. They are biaxial negative crystals, with Ng=c= 1.5540, Nm = b = 1.5355, Np =α=1.4220; 2V=40°56'. γ=v is weak. On the curves of DTA, there is a big and wide endothermic peak (between 50-150℃...

    The crystal of ammonium bicarbonate belongs to orthorhombic system with symmetry 3L2 3PC. They exist in three forms: prismatic, slaty or particle shape. The crystals appear colorless to white or light grey, transparent to semitransparent. The cleavage parallel to (110) is perfect. Hardness H=1.55. Density D= 1.573 g/cm3. They are biaxial negative crystals, with Ng=c= 1.5540, Nm = b = 1.5355, Np =α=1.4220; 2V=40°56'. γ=v is weak. On the curves of DTA, there is a big and wide endothermic peak (between 50-150℃ ). The curves of TGA showed a continuous weight-loss. On the infrared absorption spectra, there are two strong peaks (3330-3030, 1430-1380), corresponding to the stretching and bending of the ions NH4+. And there are two less strong peaks (2850, 2550), corresponding to the stretching and bending of the anions HCO3-. The unit cell dimensions are α = 7.220(1)A, b=10.672(l)A,c = 8.719(2)A, v = 671.927(3)A3. There are eight moloculs in the unit cell and the space group is Pccn. Dx =1.5215. In the structure, the HCO3- anion groups are connected by hydrogen bonds to form chains parallel to c axes. The NH4+ ione groups constitute tetrahedrons connected by four chains of the HCO3- anions. In the crystal, there are two form of hydrogen bonds, namely O-H… O and N-H…O.

    碳酸氢铵属于斜方晶系,晶形有柱状、板状和粒状三种习性。晶体呈无色或灰白色,透明-半透明,平行(100)解理完全,硬度为1.55;比重为1.573g/cm~3。二轴晶负光性,N_g=c=1.5540,N_m=b=1.5355,N_p=a=1.4220;2v=40°56′,r=v弱。在差热曲线上50—150℃之间出现一个大而宽的吸热峰,失重曲线上显示连续失重。根据红外吸收光谱表明在频率3330-3030;1430-1380两个强吸收峰为NH_4~+基团的伸缩与弯曲振动;2850,2550等强-中强峰示为HCO_3~-基团的伸缩与弯曲振动。根据四圆单晶衍射仪测得晶胞参数为a=7.220(1),b=10.672(1),c=8.719(2);v=671.925(3)~3;空间群为Pccn,z=8;D_x=1.5215。在结构中HCO_3~-形成链状氢键体系且平行c轴;NH_4~+形成正四面体,以氢键N—H…O方式与上下左右HCO_3~-链紧密联系。晶体内部存在O—H…O和N—H…O两种形式的氢键。由于两种氢键的性质不同,因此对碳酸氢铵晶体的易分解挥发,吸湿结块及热稳定性等性能密切相关。

    The arrangements of Ga-cluster are described in detail in this paper.

    本文论述了镓—碱金属化合物中,镓原子簇多面体或多面体局部的分布,认为化合物NaGa_4以及Na_(22),Ga_(39)中分别存在着9,16,8—开放式正八面体以及6,9,4—开放式正四面体,提出一个原子簇多面体凝聚的新定义,即在化合物NaGa_4、K_3Ga_(13)和RbGa_7中存在着多面体或多面体局部的凝聚现象.

    The Gezhouba Project is a large run-of-river hydropower plant with an installed capacity of 2715MW. Itis built on Changjiang (the Yangtze River), the biggest river in China. Its main channel was successfully blocked on Jan. 4, 1981 when the river discharge was 4400-4800 cubic meters per second. The 203 meters gap of the cofferdam dike was closed with 106, 000 cubic meters of block stones and concrete pyramid blocks within 36 hours and 23 minutes. A lot of scientific experiments and preparations had been made...

    The Gezhouba Project is a large run-of-river hydropower plant with an installed capacity of 2715MW. Itis built on Changjiang (the Yangtze River), the biggest river in China. Its main channel was successfully blocked on Jan. 4, 1981 when the river discharge was 4400-4800 cubic meters per second. The 203 meters gap of the cofferdam dike was closed with 106, 000 cubic meters of block stones and concrete pyramid blocks within 36 hours and 23 minutes. A lot of scientific experiments and preparations had been made before the closure. Main technical features such as the layout of river diver-sion, selection of closure time and the corresponding discharge, selection of closure scheme, preparation of dumping materials and the closure performance are described.

    葛洲坝工程是建在中国长江(扬子江)上的一个大型径流式水电站,其装机容量为2715兆瓦。大江于1981年1月4日截流。当时河流洩流量为每秒4400—4800立方米。仅用了36小时23分钟把一个203米长的龙口合龙,为此一共用去106,000立方米石方和混泥土正四面体。本文介绍了合龙之前的大量的科学试验和准备工作以及诸如导流方案、截流时间和相应洩流量,截流方案的选择和施工材料的准备、主要技术特性以及截流的具体安排。

     
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