历史查询   



 为了更好的帮助您理解掌握查询词或其译词在地道英语中的实际用法，我们为您准备了出自英文原文的大量英语例句，供您参考。 
It is wellknown that the ring of invariants associated to a nonmodular representation of a finite group is CohenMacaulay and hence has depth equal to the dimension of the representation.


The essential dimension is a numerical invariant of the group; it is often equal to the minimal number of independent parameters required to describe all algebraic objects of a certain type.


We also give conditions for the two algebras to be equal, relating equality to good filtrations and saturated subgroups.


We present two generalizations of the orthogonal basis of Malvar and CoifmanMeyer: biorthogonal and equal parity bases.


An important property of this matrix is that the maximum and minimum eigenvalues are equal (in some sense) to the upper and lower frame bounds.

 更多 


 With γrays of various wavelengths the number of counts produced in a GeigerMuller counter of Pbwall was determined in equal time intervals. The same experiment was carried out with a counter of Alwall. Let Npb and NA1 represent the number of counts produced in the Pbcounter and Alcounter respectively by a beam of γrays of even wavelength in a given time interval. The ratio Nph/NA1 observed decreases at first with the wavelength of the incident beam due to the diminishing photoelectric of lead.... With γrays of various wavelengths the number of counts produced in a GeigerMuller counter of Pbwall was determined in equal time intervals. The same experiment was carried out with a counter of Alwall. Let Npb and NA1 represent the number of counts produced in the Pbcounter and Alcounter respectively by a beam of γrays of even wavelength in a given time interval. The ratio Nph/NA1 observed decreases at first with the wavelength of the incident beam due to the diminishing photoelectric of lead. It is, however, found to increase by 16% when the wavelength of the incident radiation is decreased from a value 6.6 x. u. 4.7 x. u. This rising is due to particles produced by the interaction of hard γrays with the Pbnuclei.  能力极大的丙种镭辐射,可以影响原子核,这是新近发见的事实。为进一步的研究,我们把极硬的丙种镭辐射,照在铅的数电子管(Electron Counter)上结果:除了射出的光电子和反跳子(Compton RecoilElectron)外,还观察到一种电子(有阴阳二种),约占总数的百分之十七。这种电子的来源,现在有两种解释:1从原子核里射出。(2)直接由丙种镭辐射变成。  A right hallow circular cylinder of quartz having its generator parallel to the principal axis liberates electricity when subjected to torsion about its axis. Charges of opposite signs appear on the inner and outer surfaces. When torsion is applied in the same sense as that of the optical rotation, positive electricity is developed on the outer surface, and vice versa. The quantity of electricity produced by the action of a couple of moment C on a hollow quartz cylinder of external diameter d0, internal diameter... A right hallow circular cylinder of quartz having its generator parallel to the principal axis liberates electricity when subjected to torsion about its axis. Charges of opposite signs appear on the inner and outer surfaces. When torsion is applied in the same sense as that of the optical rotation, positive electricity is developed on the outer surface, and vice versa. The quantity of electricity produced by the action of a couple of moment C on a hollow quartz cylinder of external diameter d0, internal diameter di and length l is klC/do dodi), where k is equal to 9.2x108 in absolute C. G. S. electrostatic units.  割水晶成一圆柱,圆柱之轴即为晶体之光轴,在圆柱之中心穿一孔道,使成一空心圆柱壳,以金属箔敷於圆柱壳内外侧面成两电极。当圆柱之一端固定,一端被扭,则两电极发生异号而等量之电荷,扭转之方向既易,内外两极电荷之号亦互易。若扭力偶矩左旋,则左旋水晶柱之外极得正电;若扭力偶矩右旋则右旋水晶柱之外极得正电。 吾人曾由实验测定水晶圆柱之长短l,内外直径d_i及d_0之大小,与由扭偶矩C所生电量q之关系式如次: q=k(l/(d_0(d_0d_i)))C式中K为一常数,在C.G.S.绝对静电单位制中等於9.2×10~(8)。  An interference pattern of two systems of fringes has been obtained by vising two radiations in a Hilger prism interferometer A system of white bands with equal spacing which are always parallel to the refracting, edge of the prisin is the result of the intersection of the two systems of fringes. The white bauds travel as one of the reflecting mirror in the interferometer makes a parallel displacement. Let d be the displacement of mirror when the white bauds travel one spacing,Two yellow doublets in sodium... An interference pattern of two systems of fringes has been obtained by vising two radiations in a Hilger prism interferometer A system of white bands with equal spacing which are always parallel to the refracting, edge of the prisin is the result of the intersection of the two systems of fringes. The white bauds travel as one of the reflecting mirror in the interferometer makes a parallel displacement. Let d be the displacement of mirror when the white bauds travel one spacing,Two yellow doublets in sodium and mercury lamps were used. The values found forA comparison of this method with the visibility corve by Michelson interferoineter has been discussed.  在Hilger棱镜干涉仪中,用两辐射线,则在一干涉图形中可得两组不同方向之干涉纹;因两组不同方向之干涉纹之相交,而得一组平行之白色条纹。此种条纹恒与棱镜折射边相平行,而条纹间之间隔为相等。当干涉仪之一反射镜作前後平行移动时,白色条纹则向左或右移动。令白色条纹移过一间隔时,反射镜移动之距离为d.则得 1/(λ_2)1/(λ_1)=1/2d. 钠光及汞光灯中之黄色双线普用于此实验中。1/(λ_2)1/(λ_1)之值各求得为17.22厘米~(1)及63.29厘米~(1)。此实验与麦凯尔逊干涉仪之明视曲线互见短长,本文曾讨论及之。   << 更多相关文摘 
相关查询  



