共查询到14条相似文献,搜索用时 468 毫秒
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提出图wn*pk的概念,并在n≡0(mod 2)且n≥4,k≡1(mod 2),k≡0(mod 2)和n≡1(mod 2)且n≥5,k≡1(mod 2),k≡0(mod 2)时,证明图wn*pk是优美的. 相似文献
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证明差分方程x_n=(A x_(n-1)~p)/(B x_(n-k)~p),n=0,1,2,…,(其中k≥2,A,B,p∈(0, ∞))在p~(k-1)≥k~k/(k-1)~(k-1)时,有无界的解,并且当p~(k-1)相似文献
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摘要设Sm(n)是第m个n角数,给出当n-2为平方数时方程Sx(n)=Sy(3)的全部解的通式,并证明当n-2为非平方数时该方程有无穷多组正整数解. 相似文献
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In the ZrO2-based ceramic systems doped with different oxides (Y2O3, MgO and Al2O3), the behaviors of electronic and ionic conductivity have been investigated by the quantum chemical SCF-Xα-SW method. The results of the electronic energy spectra and local state density of atoms show that, for the ZrO2 system doped with Al2O3, the energy gap near the Fermi energy level becomes smaller, which implies that the electronic conductivity increases. Since the binding energy between Al and O atoms is increased, the energy for oxygen vacancy migrating is enhanced and the ionic conductivity decreases. In the MxOy-doped ZrO2 systems, due to the doping effect of Al2O3, MgO and Y2O3, the ionic conductivity increases successively, and the electronic conductivity decreases successively. The calculation results are in agreement with that of references and experience. 相似文献
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