A Boundary Schwarz Lemma for Holomorphic Mappings on the Polydisc

The authors prove a general Schwarz lemma at the boundary for holomorphic mappings from the polydisc to the unit ball in any dimensions. For the special case of one complex variable, the obtained results give the classic boundary Schwarz lemma.     

高分子材料的应力诱导反应

本文是作者所在科学研究群体借助超声波、高速搅拌、微波和研磨应力诱导反应制备一些难以用一般方法合成的嵌段／接枝共聚物和高分子纳米材料,探索高分子材料高性能化高效途径等方面研究工作简介。     

球磨法改善电学接触增强碳纳米管场发射性能

本文采用CNT与纳米银颗粒混合球磨的方法,改善了CNT与衬底电极的电学接触性能.并比较了球磨和电泳两种方法分别获得的CNT的场发射特性,结果表明:采用球磨法所获得的CNT场发射阴极的场发射性能远远优于电泳法.在球磨过程中,由于钢球、纳米银颗粒、CNT和衬底之间互相挤压,使CNT和银颗粒及衬底之间形成紧密牢固的接触,减少了界面的接触电阻,从而大大改善了界面的电学接触性能.而电泳沉积的CNT和衬底之间基本上是简单的物理附着力,接触电阻很大,而且由于这种作用力相对较弱,往往会导致发射体本身不稳定.球磨提供了一种改善电学接触的简单有效方法,并且适合于大规模生产CNT场发射冷阴极.     

Removal of Congo red dye from aqueous solution with nickel-based metal-organic framework/graphene oxide composites prepared by ultrasonic wave-assisted ball milling

Metal-organic frameworks (MOFs) were successfully synthesized by ultrasonic wave-assisted ball milling. In the absence of organic solvent, the coupling effect of ultrasonic wave and mechanical force played an significant role in the synthesis of MOFs. Adsorption of Congo red (CR) was studied in view of adsorption kinetic, isotherm and thermodynamics. The adsorbent was carried out using X-ray diffraction (XRD), thermogravimetric analysis (TGA), N₂ adsorption-desorption isotherms, Raman spectroscopy and scanning electron microscope (SEM) methods. It was found that pseudo-second-order kinetic model and Freundlich adsorption isotherm matched well for the adsorption of CR onto nickel-based metal-organic framework/graphene oxide composites (Ni-MOF/GO). The results of the adsorption thermodynamics indicated that the adsorption process was a spontaneous and endothermic process. The adsorption capacity of graphene oxide/metal-organic frameworks (GO/MOFs) for CR reached 2489 mg/g, much higher than previous reports. It was demonstrated that an increase in the number of active metal sites can dramatically improve the adsorption capacity of dye. A suitable dry temperature is beneficial for the improvement of adsorption capacity for dye. In this paper, the adsorption results indicated that ultrasonic wave-assisted ball milling has a good prospect for synthesis of MOFs with excellent adsorption performance.     

循环球式转向器疲劳性能试验设计

为了检测循环球式转向器的疲劳性能,在分析转向器工作原理的基础上,运用电液伺服材料试验机INSTRON 1251试验台与计算机控制单元,设计了转向器疲劳试验系统。研制了转向器疲劳试验工装夹具,系统加载动态响应良好,达到了转向器疲劳试验参数要求。试验运行表明:该试验设计实现了转向器疲劳性能测试,操作简便,控制精度高,为转向器结构设计与强度评估提供了基础技术支持。     

从单位球上Bergman型空间到Bers型空间的加权复合算子

本文利用Bergman型空间A_ω~p中函数值的估计,通过构造一些新的测试函数,得到了多复平面C~n中单位球上Bergman型空间A_ω~p到B3ers型空间H_v~∞、小Bers型空间H_v~0的加权复合算子有界性和紧性的充要条件,此外,还获得了Bloch型空间上有界复合算子的谱.     

FW-空间内单位球面上有界线性算子的数值域

目的研究FW-空间内单位球面上有界线性算子的数值域的几何性质,主要是闭凸性的相关结论。方法引入与FW-空间相关的一个深入定义(即冯-闭凸性)后,给出了FW-空间内单位球面上有界线性算子的数值域必然具有冯-闭凸性的一个不太简短的证明。结果表明了如果H是一个FW-空间,那么它的单位球面上任何有界线性算子的数值域都是一个H的一个冯-闭凸子集。结论作为特殊的Hilbert空间,FW-空间内单位球面上有界线性算子及其数值域有着颇为有趣的性质。     

连续型概率度量的特征及其应用

讨论了连续型概率度量空间,给出了连续型概率度量的特征定理.利用这个特征定理,我们获得了连续型概率度量空间的闭球套定理和M enger空间完备性特征定理.作为本文的应用获得了一个局部概率压缩映象不动点定理.     

海洋电场传感器低噪声Ag/AgCl电极的制备及性能

分别通过研磨法、球磨法、液相沉淀法和微反应器法制备了Ag/AgCl电极所用的AgCl前驱粉体,对其进行了形貌和成分分析,并对电极短期稳定性、电化学噪声的水平进行了测试。结果表明:相比之下,球磨法所制备的Ag/AgCl电极一致性好,同种电极之间的极差电位小于0.11125 mV。该电极具有良好的短期稳定性能,电位差漂移量不超过0.01906 mV/24 h,电极电压噪声密度在1 Hz处可降低至19.16 nV/Hz1/2。     

On an integral-type operator from logarithmic Bloch-type spaces to mixed-norm spaces on the unit ball

Let H(B) denote the space of all holomorphic functions on the open unit ball B of Cⁿ and g∈H(B). We characterize the boundedness and compactness of the following integral-type operator