红外光纤与PbS红外探测器耦合研究

本文以红外光纤与PbS红外探测器相耦合,构成“带尾钎”的新型组合件。基于光纤波导可绕曲性使红外探测器在红外系统中的位置有更多的随意性和灵活性,并能有效减小杂散光的干扰,改善系统的信噪比。     

多元Szász—Mirkjan算子的一致逼近

本文研究了多元Szása—Mirakjan算子在C_2B(T)中的逼近性质,利用K—泛函,建立了等价的逼近定理.主要结果如下 定理设f∈C_2B(T),0a) ;(ii)‖S_n,m(f)-f‖_∞ =0(n^-a);(iii)a)‖f(x+tφ(x),y)-2f(x,y)+f(x-tφ(x),y)‖_∞ =0(t<     

Structure and coordination behavior of 2,3-bis(2-furanyl)quinoxaline

The title compound crystallizes in the orthorhombic system, space group Pna2₁, with a = 15.721 (5) Å, b = 16.945 (5) Å, c = 4.6961 (15) Å, V = 1251.0 (7) ų, and Z = 4. One furanyl ring is rotated with respect to the quinoxaline group by 66.4(2)°, and another furanyl ring almost lies coplanar with the quinoxaline moiety. Although it has potential for chelation involving the furanyl oxygen atom and the nearest nitrogen atom of the quinoxaline group, poor coordination behavior was observed while attempting to synthesize its complexes with a metal center like Ru(II), Cu(II), or Co(III), entirely different from its analogue 2,3-bis(2-pyridyl)quinoxaline. This is most likely due to the weak donating ability of the furanyl oxygen atom and the steric hindrance.     

半参数回归模型的渐近有效L-估计

对半参数回归模型yi=χiTβ+g(χi)+ei,i=1,2,…,n,对非参数函数g(·)采用核估计的方法,构造了参数向量β的L-估计量λn,在一些正则条件下,获得了λn的渐近正态性和非参数函数g(·)的估计量gn(t)的最优收敛速度可达到O(n-(1/3)),并且给出了标准化L估计量λn的渐近分布的Berry-Esseen界.     

基于小波变换的CCD光谱信号消噪及汽车车灯颜色测试的应用研究

研制了一种新型测色系统。依据小波变换理论 ,对颜色测量中所接收到的光谱信号采用了小波变换消噪平滑数据处理技术 ,提高了系统测色的精度。采用CCD作为光电转换元件 ,接收汽车车灯光谱并转换为电信号 ,提高了测量速度。给出了CCD关于颜色测量的光谱标定方法。通过测量色度值与其标准色度值比较 ,所得偏差Δx≤ 0 0 0 8,Δy≤ 0 0 0 8;重复性Δx≤ 0 0 0 8,Δy≤ 0 0 0 8。     

Synthesis of a New Family of Green Light Emitting Material Containing Both Hole and Electron Transporting Units

Since Tang and Van Slyke reported the first double-layer organic electroluminescent (EL) device using Alq3 (q = 8-hydroxyquinolinyl) in 19871, organic EL devices have received a great deal of attention in view of their application as full-color flat-panel displays as well as academic interest2,3,4. There have been extensive studies of organic EL devices directed toward achieving high brightness and multi- or full-color emission, and in particular, improving the durability and thermal stabi…     

Rate of convergence for Meyer-König and Zeller operators with Jacobi-Weights

We point out that the Meyer-Konig and Zeller operator M. (f;x) are unbounded in usual Jacobiweighted norm at first, and then we consider the weighted approximation by M.(f ;x) by a new norm andobtain the characterization of convergence rate in nonoptimal approximation by K-functional.     

多圆盘上的Toeplitz算子的紧的乘积

对于多圆盘上的有界多重调和函数f,g,我们证明多圆盘Bergman空间上的Toeplitz算子的乘积TfTg是紧算子的充要条件是TfTg是零.这等价于f或g是零.换位子TfTg-TgTf是紧算子当且仅当换位子TfTg-TgTf是零.这等价于对每一个j,存在不全为零的常数αj和βj,使得αjf+βjg关于变量zj(1≤j≤n)是常数.