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增值电信业务经营许可证 豫BAA^T=0为什么A一定=0
王者刘忻5aX
设A=(aij)则A的第1行元素为 a11,a12,...,a1nA^T的第1列元素为 a11,a12,...,a1n所以 AA^T 的第1行第1列的元素为 a11^2+a12^2+...+a1n^2再由 AA^T = 0得 a11^2+a12^2+...+a1n^2 = 0由A是实矩阵 ----应该有这个前提吧所...
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Cu0.5Tl0.5Ba2Ca3Cu4-yZnyO12-δ (y=0, 1.0, 2.0, 3.0, 3.5): Superconductor with Four ZnO2 PlanesNawazish A. KhanMaterials Science Laboratory, Department of PhysicsQuaid-i-Azam UniversityM. MumtazMaterials Science Laboratory, Department of PhysicsQuaid-i-Azam UniversityArticleDOI:
10.-007-9495-6Cite this article as: Khan, N.A. & Mumtaz, M. J Low Temp Phys (: 97. doi:10.-007-9495-6
A new Cu0.5Tl0.5Ba2Ca3Cu4-yZnyO12-δ (y=0, 1.0, 2.0, 3.0, 3.5) superconductor with four ZnO2 planes is reported. The structure of the material remains tetragonal for all Zn doping concentration. The substitution of Zn at CuO2 planar site was carried out following Cu0.5Tl0.5Ba2Ca3Cu4-yZnyO12-δ (y=0, 1.0, 2.0, 3.0, 3.5) formula. Contrary to all previous studies of Zn doping in all copper oxide high temperature superconductors, the zero resistivity critical temperature Tc(R=0), critical current density and quantity of diamagnetism increase with increased Zn concentration. The onset temperature of superconductivity in these samples was observed at 128 K and Tc(R=0) at 122 K for y=3.5. The volume of the unit cell observed through X-ray diffraction scan is found to decrease with increase Z promoting an increase in Fermi vector KF and effective density of states which results in enhanced superconductivity parameters. The synthesis of Cu0.5Tl0.5Ba2Ca3Cu4-yZnyO12-δ material by this method is highly reproducible.
Cu0.5Tl0.5Ba2Ca3Cu4-yZnyO12-δ superconductorsZn dopingHigher Tc(R=0)Higher Jc(H=0)1.
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Share article请问a的x次方的积分 ∫aˆx怎么求 要正向推导过程
牛牛最美付
(a^x)'=a^x*lnaa^x=(a^x)'/lna所以∫a^xdx=∫(a^x)'dx/lna=a^x/lna
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令a^x=t,则xlna=lnt,即x=lnt/lna,dx=dt/tlna。∫a^xdx=∫t*(1/tlna)dt=(1/lna)∫dt=t/lna+C=a^x/lna+C.
扫描下载二维码a^tlna-a=0 t(a)=?
a^tlna=a,tlna=lna,t(a)=a,不过你自己需要算算a的取值范围
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