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spin     
相关语句
  自旋
     Theoretical Investigations of the Spin Hamiltonian Parameters of the Lowest Kramers Doublets for 3d~7(Co~(2+)) and 4f~(11)(Er~(3+)) Ions in Crystals
     晶体中3d~7(Co~(2+))和4f~(11)(Er~(3+))离子最低Kramers双重态的自旋哈密顿参量的理论研究
短句来源
     Theoretical Investigations of the Spin Hamiltonian Parameters for the Rare Earth Kramers Ions in Crystals
     晶体中稀土Kramers离子自旋哈密顿参量的理论研究
短句来源
     High Spin States of ~(126)Cs and Chiral Twin Bands in A~130 Nuclei
     ~(126)Cs的高自旋态及A~130区手征双重带研究
短句来源
     Nonlinear Dynamics of One-Dimensional Spin Chain and Spinor Bose-Einstein Condensates in an Optical Lattice
     一维自旋链及光格子中旋量玻色—爱因斯坦凝聚的非线性动力学
短句来源
     Spin Polarization Effect and Structures for the Transition Elements Molecules
     过渡元素分子的结构和自旋极化效应
短句来源
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  旋转
     The Application of S7-200 PLC On Spin Rinse Dryer
     S7-200系列PLC在旋转冲洗甩干机中的应用
短句来源
     Layered K2Ti4O9 thin films were prepared from the suspension of fine particles K2TiO9 by spin coating. The suspension was obtained by wet grinding and centrifugalizing of the K2Ti4O9 powder, which was got by sintering the analytical pure TiO2 and K2CO3. Also, the structure of the thin films was Characterized by XRD and SEM.
     本文采用分析纯TiO_2和K_2CO_3粉末为原料,采用固相反应制备K_2Ti_4O_9粉末,然后经过湿磨,离心沉淀分离和旋转涂敷在普通玻璃表面制备K_2Ti_4O_9薄膜,通过XRD和SEM对其结构和表面形貌进行了表征。
     Influence of the processing conditions on the morphology of solution-deposited LiMn_2O_4 thin films by spin coating
     采用旋转镀膜技术的溶液沉积法合成的LiMn_2O_4薄膜形貌与合成条件之间的关系研究(英文)
短句来源
     To obtain CdS/K4Nb6O17 thin film through the same course of making CdS/K4Nb6O17 powder on the base ofK4Nb3O17 thin film on the quartz which made by the spin coating and after heat treatment.
     通过旋转涂覆法在石英玻璃基片上制备了K_4Nb_6O_(17)薄膜,采用一定的热处理制度后对薄膜分别进行离子交换、层间胺插入、硫化处理等处理过程制备了CdS/H_4Nb_6O_(17)薄膜形式的光催化材料。
短句来源
     drying white tungsten concentrate by spin Flash Dryer theory and method were introduced by which the traditional drying method and product quality can be improved and the frugal energy and production cost were reduced,the working conditions were improved.
     从干燥理论与干燥方法上介绍用旋转闪蒸干燥白钨精矿的操作实践,通过采用这一干燥方式有利于改造目前传统干燥方法,提高产品质量,节约能源,降低生产成本,改善工作环境。
短句来源
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  尾旋
     J7L high AOA/stall/spin flight test
     J7L飞机大迎角/失速/尾旋试飞
短句来源
     Research on JL8 aircraft stall and spin flight test
     JL8飞机失速尾旋飞行试验研究
短句来源
     THE PREDICTING CALCULATION FOR AIRCRAFT J-7(Ⅱ)'S STALL/POST-STALL/SPIN CHARACTERISTICS
     J-7(Ⅱ)型飞机失速/过失速/尾旋特性预测计算
短句来源
     FREE FLIGHT TEST TO DETERMINE THE STALL/SPIN CHARACTERISTICS OF REMOTELY PILOTED MODEL(1: 6 SCALE) FOR J—7LP AIRCRAFT
     J-7LP飞机1:6遥控模型失速尾旋试验
短句来源
     Stall/Spin Flight Testing for Mig-21 Aircraft
     M_ИΓ──21型飞机失速/尾旋飞行试验
短句来源
更多       
  
     (C4H9NH3)2MCl4(M=Mn, Zn) and (C4H9NH3)2PbX4(X=Br, I) films were prepared on glass and quartz substrate separately using spin coating technique and were characterized by XRD, the results told us the corresponding layered perovskite-type films formed;
     利用涂法分别在玻璃基片上制备了(C_4H_9NH_3)_2MCl_4(M=Mn,Zn)薄膜,在石英基片上制备了(C_4H_9NH_3)_2PbX_4(X=Br,I)薄膜,并用XRD对薄膜结构进行表征,结果表明可以获得目标产物相应的层状类钙钛矿薄膜;
短句来源
     and draw into the concepts of isospin I, C-spin and t spin doublets, which arc respectivelydefined as : I3 = u+d/2, C3=C+s/2, t3=t+b/2;
     C——. t——二重态的概念,它们分别定义为:I_3~-=(u+d)/2,C_3~-=(C+S)/2,t_3~-=(t+b)/2;
短句来源
     J7L high AOA/stall/spin flight test
     J7L飞机大迎角/失速/尾试飞
短句来源
     Symmetrization of Kronecker Product of Basic Spin Representation of symmetric Group S_(2γ)
     对称群S_(2γ)的基本表示张量积的对称化
短句来源
     XRD、AES Research for SnO_2 thin Films Fabricated by Spin
     涂法制备SnO_2薄膜的XRD、AES研究
短句来源
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  spin
If is a ?2-grading of a simple Lie algebra, we explicitly describe a-module Spin0 () such that the exterior algebra of is the tensor square of this module times some power of 2.
      
Although Spin0 () is usually reducible, we show that a Casimir element for always acts scalarly on it.
      
The nonselective, selective and double-selective spin-lattice relaxation rates of some protons in huperzine E were acquired in the absence and presence of AchE at a concentration ratio of [ligand]/[protein] = 1: 0.005.
      
Direct current magnetic susceptibility measurement in the 2-300 K temperature range supports a high-spin ground state.
      
In particular, the analytical forms of the one-body and two-body FPC for the total spin states with {N} and {N-1,1} permutation symmetries have been derived.
      
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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 main difficulty of the one-electron theory of optical activity lies in the calculation of the so-called vicinal actions. This may be overcome, as suggested in the present investiga- tion by assuming that the vicinal actions are due to the interactions of various chemical bonds in the molecule with the chromophoric electron. For the calculation of these interactions the charge distribution of a single covalent bond is assumed to consist of two nuclei, each of unit positive charge, separated by the bond distance...

The main difficulty of the one-electron theory of optical activity lies in the calculation of the so-called vicinal actions. This may be overcome, as suggested in the present investiga- tion by assuming that the vicinal actions are due to the interactions of various chemical bonds in the molecule with the chromophoric electron. For the calculation of these interactions the charge distribution of a single covalent bond is assumed to consist of two nuclei, each of unit positive charge, separated by the bond distance and two electrons with opposite spins and a spherically symmetrical orbital eigenfunction represented by (?) where r is the distance measured from a certain point on the bond axis and near the center of the bond. The location of this point is so determined that the model will give the proper dipole moment of the bond. The exponent α, which determines the extent of diffusivity of the electron cloud, is obtained by an approximate variational treatment. The quadruple moment of this model, calculated for the C-H bond, agrees very well with that estimated by Lassettre and Dean from a study of the potential barrier hindering the internal rotation of the ethane molecule. To test the theory and also to illustrate the procedure which is followed in calculating optical rotations using the new model of vicinal actions, the optical rotations of several methyl derivatives of cyclopentanone have been calculated and the following conclusions have been reached: (1) The proposed model gives rise to optical rotations in agreement with the observed values. (2) The effect of the internal rotation of the methyl group on the molecular rotation [M]_D of 3-methylcyclopentanone is large, [M]_D being +44° and -130° for the cis- trans-conformations, respectively. (3) The observed [M]_D may be regarded as composed of two parts, namely, the contribution from the multipole terms and that from the orbital overlapping. The latter corresponds to the "incomplete screening of atomic nuclei", and has been regarded as the most important vicinal action in earlier calculations. In the present work, it is shown, however, that this effect contributes only a few percent of the total [M]_D, unless the perturbing group is very near to the chromophoric group as it is in the case of 2-methyl- cyclopentanone. The failure of the previous calculations is, therefore, due mainly to the omission of the multipole (especially the quadrupole) terms. (4) The absolute configuration of 3-methylcyclopentanone, indicated by the present calculation, is the opposite of the one suggested by Eyring, since he based on the overlapping contribution alone, which bears a sign opposite to that of the total [M]_D (5) That the observed [M]_D of 2,4,5,5-tetramethylcyclopentanone is considerably smaller than that of 2,4-dimethylcyclopentanone may be due to one or both of the following possibilities: (a) that the conformation of the 2- and 4-methyl groups slightly deviates from the trans-position in the tetra-methyl compound, due to the presence of the two additional methyl groups; (b) that the two additional methyl groups in 5,5-positions are not exactly symmetrical with respect to the ring so that they make contributions to [M]_D.

本文在量子力學的單電子旋光理論的鄰近作用問題上,作了如下的貢獻: 1.指出旋光度應由分子中各化學鍵,而不是分子中各原子(如像前人所假定的)對於生色團電子的微擾作用來計算,兩者的主要不同點在於是否考慮鍵的多極矩。 2.建議在旋光度的計算中,共價單鍵可以看作是由兩個處於鍵端的正電荷和一個以單中心狀態函數,表示出來的電子雲所組成。根據這個假定計算了環戊酮的甲基衍生物的旋光度,其結果與實驗值甚爲一致(詳見結果討論)。 3.計算結果證明甲基的內旋轉對於旋光度的影響很大,例如順式和反式構型的3-甲基環戊酮的旋光度,應分別為+44°和-30°。 4.指定了3-甲基環戊酮的絕對構型,其結果Eyring所指定者相反。

In this paper a 4-roller two-zone apron type super-high drafting apparatus is introduced. Considerations under which this apparatus was designed, like drafting capacity, method of controlling fibre motion, type of mechanism, etc., are described in detail. The emphasis is laid on the distribution of zone of frictional force before and after the roving entering each drafting zone. The importance of collectors in super-high drafting apparatus is thereby examined from this point of view, and the factors of their...

In this paper a 4-roller two-zone apron type super-high drafting apparatus is introduced. Considerations under which this apparatus was designed, like drafting capacity, method of controlling fibre motion, type of mechanism, etc., are described in detail. The emphasis is laid on the distribution of zone of frictional force before and after the roving entering each drafting zone. The importance of collectors in super-high drafting apparatus is thereby examined from this point of view, and the factors of their design exploited。 The results of its preliminary tests are described. It can be seen that the spinning test for 23~S english counts gives optimistic results though further tests are still required. Factors influencing the design and spinning conditions in this drafting apparatus are discussed at the end of this paper.

本文說明了四羅拉雙區皮圈式超大牽伸設計時牽伸倍數的要求,型式的决定,並討論了在具體設計中關於摩擦力界的布置,集合器及加壓上的設計問題。文中並引用了初步試驗的結果說明在實踐中所産生的现象與提出的問題,最後曾對餵入方式,後牽伸區中影響纖維運動的一些因素及纖維密度等加以簡略的討論。

 
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