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991.
992.
朱玉扬 《数学的实践与认识》2008,38(4):142-148
记平面边长为1的正m边形为S_m,将S_m剖分成n块:S_(m1),S_(m2),…,S_(mn),这样的剖分称S_m的n剖分,并以T(m,n)表示.以d_(mi)表示区域S_(mi)(i=1,2,…,n)的直径(即区域S_(mi)任意两点之间距离的最大者).记D(m,n)=max{d_(m1),d_(m2),…,d_(mn)}及Ψ(m,n)=■{D(m,n)}.本文将估计Ψ(m,n)的上下界.证明Ψ(6,3)=3/2,Ψ(6,4)=3-3~(1/2),Ψ(6.6)=1,Ψ(6,7)=3/2,估计Ψ(6,n)的渐进性.提出几个猜想. 相似文献
993.
994.
995.
996.
997.
ZHOU Liuzhu ZHU Yuan GUO Xiaoyong ZHAO Wenwu ZHENG Haiyang Gu Xuejun FANG Li ZHANG Weijun 《中国科学G辑(英文版)》2006,49(2):187-194
Single aerosol particles were measured by matrix-assisted laser desorption/ionization (MALDI) with an aerosol time-of-flight
mass spectrometer (ATOFMS). The inlet to the ATOFMS was coupled with an evaporation/condensation flow cell that allowed matrix
addition by condensation onto the particles. The coated particles entered the ion source through three-stage differentially
pumped capillary inlet and were then ionized by a focused 266 nm Nd:YAG laser. The mass spectra and aerodynamic size of the
single particles can be obtained simultaneously. The on-line matrix addition technique makes it possible to identify biological
aerosols in real-time. 相似文献
998.
999.
Based on the theory of pH evolution of sea water and the balance between the seawater and the atmosphere the authors discussed the problems about (i) the method ofcalculating P_(CO_2) in the ancient atmosphere with the associations of sedimentary miner-als; (ii) the evolution of P_(CO_2) values in the geologic history; (iii) the relations of thepH evolution of sea water with carbonate precipitations; and (iv) calculation of the pHlimit for some associations of sedimentary minerals and its corresponding P_(CO_2) valuesin the atmosphere. The authors pointed out that though carbonates had deposited little in the Archaean,the content of CO_2 gas in the Archaean atmosphere was very high and was gradually go-ing up to form a thick CO_2 atmosphere. Up to 2600 Ma ago, the P_(CO_2) had reached a gradeof 10- 50 atm. There was a general trend of evolution that from the early Proterozoicera to the present the depositional horizon of carbonate layers was gradually risingand finally surpassed the horizons of clay min 相似文献
1000.
Unconventional Hamilton-type variational principles for electromagnetic elastodynamics 总被引:2,自引:2,他引:0
According to the basic idea of classical yin-yang complementarity and modern dual-complementarity, in a simple and unified
new way proposed by Luo, the unconventional Hamilton-type variational principles for electromagnetic elastodynamics can be
established systematically. This new variational principles can fully characterize the initial-boundary-value problem of this
dynamics. In this paper, the expression of the generalized principle of virtual work for electromagnetic dynamics is given.
Based on this equation, it is possible not only to obtain the principle of virtual work in electromagnetic dynamics, but also
to derive systematically the complementary functionals for eleven-field, nine-field and six-field unconventional Hamilton-type
variational principles for electromagnetic elastodynamics, and the potential energy functionals for four-field and three-field
ones by the generalized Legendre transformation given in this paper. Furthermore, with this approach, the intrinsic relationship
among various principles can be explained clearly. 相似文献