This paper makes the comparison between various design scheme to grade separation of Jingjiu Railroad with Shanghai Expressway,and makes the structure design and count to the recommending scheme.
Let P_0 be an arbitrarily fixed (m, 2s, s)-type subspace of a finite orthogonal geometry with characteristic≠2. Taking as treatments the (1,0,0)-type subspaces of this geometry which are orthogonal to P_0 but not included in P_0, A number of association schemes and PBIB designs with two or three associate classes are constructed.
Let Fq be a finite field of characteristic 2. In this paper, the authors use a class of 2-di-mensional non-isotropic subspaces containing a fixed 1-dimensional non-isotropic subspaces in pseudo-sympletic geometry over Fq as treatments to construct an association scheme and PBIB designs with 2(q-1) associate classes whose parameters are also computed.
As an application affine maximal and total isotropic subspaces are used to construct several classes of association schemes and PBIB designs, and calculate all the parameters.
In this paper ,with (m + 1)-subspaces of Vn (Fq) containing a given m-subspace as treatments and some equivalent classes of n×n nonsingular alternating matrices over F, or n×n nonsingular Hermitian matrices over Fqz as blocks,certain classes of 3-PBIB designs are constructed and their parameters are calculated.
This paper introduces the soft X--ray multilayers at wavelengths below 10um andsummaries some rules of selecting the multilayer meterials. We design the Ru/B4C. Rh/B4Cand Mo/B4C multilayers for sum wavelength at normal incidence, and give the idealreflectivities of 38%--50%.
In this paper, various structures of semiconductor siliconcontrolled rectifier components have been designed and calculated; the rectification current is 400A and breakdown voltage value is 2000V. Technical parameters and their inter-relationship are also given. Finally, the best technical conditions for the manufacture of high-power semiconductor device is told.
Based on the principle of diminishing sound level and its impact factors of indoor sound barriers, to design a scheme for treating noise pollution in group blower, and introduce a design of fixed and activating barriers, and then calculate the noise level being diminished.