特殊形貌纳米氧化锌的制备研究

ZnO纳米材料在光学、电学、磁学、催化以及传感器等方面具有广阔的应用前景。不同形貌的纳米ZnO具有许多新奇的用途。本文对花状、梳状、四针状以及绣球状等特殊形貌ZnO的制备进行了综述。最后对纳米ZnO的应用前景进行了展望。     

ZnO纳米半导体材料制备

文章阐述了一些制备ZnO纳米半导体材料的常用技术，如模板制备法、物理气相沉积、脉冲激光沉积、分子柬外延、金属有机化合物气相沉积，并分析了各种方法的优缺点。     

18-run nonisomorphic three level orthogonal arrays

In this paper we construct all possible orthogonal arrays OA(18,q, 3,2) with 18 runs and 3 ≤ q ≤ 7 columns and present those that are nonisomorphic. A discussion on the novelty and the superiority of many of the designs found in terms of isomorphism and generalized minimum aberration has been made.      

An effective step-down algorithm for the construction and the identification of nonisomorphic orthogonal arrays

In this paper we present an effective algorithm for the construction and the identification of two-level nonisomorphic orthogonal arrays. Using this algorithm, we identify and list a full catalogue of nonisomorphic orthogonal arrays with parameters OA(24,7,2,t), OA(28,6,2,t) and OA(32,6,2,t), t ≥ 2. Some statistical properties of these designs are also considered.     

在镀镍蓝宝石衬底上生长ZnO薄膜研究

氧化锌(ZnO)是一种原料易得、价廉、毒性小的光电薄膜材料,具有巨大的开发潜力,但ZnO薄膜一般是采用异质外延的方式获得,晶体质量有待提高。采用激光脉冲沉积(PLD)方法,在镀镍(Ni)蓝宝石衬底上生长高质量ZnO薄膜。由于镀镍工艺成熟,能够起缓冲作用,缓解ZnO外延层和蓝宝石衬底之间的晶格失配,从而能获得较高质量的ZnO薄膜。通过不同条件下生长的样品对比测试及表征,结果表明,在Ni/Al2O3上生长极性面ZnO薄膜比直接在蓝宝石上生长ZnO薄膜晶体质量更好;同时发现PLD的生长温度对ZnO薄膜有较大影响,在550℃生长条件下,生长的极性面(c面)ZnO薄膜摇摆曲线半峰宽为0.547°,晶体质量明显优于无缓冲层生长的ZnO薄膜。     

短波MIMO通信的研究进展

短波通信中的天波传播信道因为多径和多模式传播而具有充分散射的特征,因而非 常适合多输入多输出技术的应用。总结了短波多输入多输出技术通信的研究现状,归纳并分 析了 短波多输入多输出技术本身以及间隔式同构天线阵和同位置异构天线阵在短波多输入多输出 通信中应用的可行性,并指出了需要进一步解决的问题。     

喷墨打印纳米ZnO种子制备ZnO微晶棒超疏水表面

本文主要研究了由ZnO组成的超疏水表面的合成和性能。ZnO本身具有亲水性,但通过改性表面微结构可以生成疏水性表面。采用喷墨打印的方式将纳米ZnO种子打印在载玻片上,形成微凸包,再通过水热法生成ZnO微晶棒以获得超疏水表面,测得表面接触角为153°。同时分析了具有不同微晶棒阵列的超疏水表面接触角变化情况。     

Some orthogonal arrays with 32 runs and their projection properties

Screening designs are useful for situations where a large number of factors are examined but only a few, k, of them are expected to be important. Traditionally orthogonal arrays such as Hadamard matrices and Plackett Burman designs have been studied for this purpose. It is therefore of practical interest for a given k to know all the classes of inequivalent projections of the design into the k dimensions that have certain statistical properties. In this paper we present 15 inequivalent Hadamard matrices of order n=32 constructed from circulant cores. We study their projection properties using several well-known statistical criteria and we provide minimum generalized aberration 2 level designs with 32 runs and up to seven factors that are embedded into these Hadamard matrices. A concept of generalized projectivity and design selection of such designs is also discussed.AMS Subject Classification: Primary 62K15, Secondary 05B20     

Optimal designs under two related models for interference

We consider two related models for interference: one having different directional neighbour effects and one with the same neighbour effects. We show that optimal designs for one model can be obtained from optimal designs for the other model. Acknowledgement. We are grateful to H. Kushner for advance notice of his work. SP was supported by the Isfahan University of Technology, Iran.     

阵列除法器的FPGA实现

先对除法器运算进行了分析,然后用FPGA实现了两种常见的结构硬件除法器,并分析了先行进位阵列除法器的设计原理。