New zinc(II) Schiff base complexes (Z1 and Z2) were prepared through the treatment of ONNO tetradentate Schiff base ligands (H2L1 and H2L2) with zinc acetylacetonate. Elemental analysis (C, H and N) and other spectroscopic techniques such as FT-IR and H-1 NMR were used to characterize...
Arrows indicate the time of Zn application for (a) basal Zn: a day before transplanting, (b) mid-season Zn: 30 DAT and (c) late-season Zn: 85 DAT. Values are the average ± standard error (n = 4). DTPA-extractable Zn levels in soils prior to the start of the ...
Z63n.-0d3o°paenddT6i9O.028N°Pcsoarrreesgpiovenndeind Fig. 2a. The to the pure diffrac- anatase ap(1th04a53s)e.,5o(62f°1T(1i1O)0, 21(2w)0ai4tsh)soalacntidtaitc(ee1d1c6ow)nitcshtraytnshttae5lfl3oa.cg7er8a5cpe2hnAitc°erp(eJlCadnPceDus.bSHiNcopow.he2av1se–er1...
解:令 f(u)=Ⅱ(u-z1) i=1 =u^n+C_(n-1)u^(n-1)+⋯+C_(1n)u+C_0 3 其中 |C_0|=|z_1z_2⋅z_n|=1 设 C_0=e^(iθ), C_0=e^(iθ), e^(iθ),0≤θ n,在单位圆 u_1=1 上取 n个复数 e_k=e^(ikπ+θ) ,k =1,2,… ,n,有ε_k^n=e^(iθ) ...
设R0=(z1,z2,⋯,zn),其中z1∈U={0,1,3},i=1,2,⋯,n.定义序列R0,R1,R2,如下:若Rf=(x1,x2,⋯,xn),那么Rf+1=(y1,y2,⋯,yn),其中:当xi=xi+1时,yi=xi;当xi≠xi+1时,yi等于集合U={0,1,2}中去掉{xi,xi+1}所剩下的元素,并且xn+1=x1. 若R0=(0,1,1),求...
他们相互独立的充分必要条件是各元之间 的协方差为0
对于n个复数z1,z2,…,zn,如果存在n个不全为零的实数k1,k2,…,kn,使得k1z1+k2z2+…+knzn=0,就称z1,z2,…,zn线性相关。若要说明z1=1+2i,z2=1—i,z3 =-2线性相关,那么可取{k1,k2,k3}=___。(只要写出满足条件的一组值即可). 解析:k1(1+2i)+k2(1-i)+k3(-2)=0, ∴(k1+k...
解得|zn|=1,故|zn|=1(n=1,2,⋯,2020);证明:(2)若z∈A,则A={zz1,zz2,⋯,zz2020},故存在k∈{1,2,⋯,2020},使得zzk=z.由z≠0,可知zk=1,即1∈A,故存在n∈{1,2,⋯,2020},使得zzn=1,即z_n=1/z,故=(|z|^2)/z=1/z=z_n∈A;解:(3)A=\(z|z=cos(k...
(a) Fluorescence spectra of CZtpyZn (10 μM) upon addition orofoPmPit(e0m–p5 eμrMat)uirne.H(bE)PPEloStbouffffleuro(rpeHsc =en 7c.e4,in1t0e mnsMityiantH512O5 n/DmMveSrOsu, 7s/c3o,nvc/evn) twrahteionnexocfiPtePdi.a(tc4)0P0h nomtogartaph of ...
关于n个复数z1、z2、…、zn,若是存在n个不全为零的实数k1、k2、…、kn,使得k1z1+k2z2+…+knzn=0,就称z1、z2、…、zn线性相关.若要说明复数