主动声呐信息过程的实验研究——声呐信号综合分析仪在信道研究和声呐设计中的应用

本文介绍声呐信号综合分析仪(简称SZY)在主动声呐信道特性的实时测量和声呐设计中的应用原理和方法,并给出部分实验结果.内容包括:1.声呐信号分析:相关、模糊度和谱以及随机数据的统计测量;2.主动声呐信道(水声传输信道、目标散射和混响)特性的测量:时变谱和时变相关、时空相干性和散射函数;3.声呐检测和最佳设计:定位、跟踪、波形设计和信道匹配.     

窄带光纤光栅的写入

改进相位掩模法写入光栅的装置，提高其机械稳定性和温度稳定性，不仅提高了光纤光栅的反射率，而且降低了带宽，特别是能在国产的光敏光纤上写出了大于９９％反射率和小于０２ｎｍ带宽的高质量的光纤光栅这种光栅特别适用于光纤光栅传感方面的应用     

高透光p型CuSCN薄膜的电沉积制备及机理研究

A stable aqueous electrolyte solution containing Cu(Ⅱ) cations and (SCN) anions was prepared by adding EDTA(ethylenediamine tetraacetic acid disodium salt, C₁₀H₁₄N₂O₈Na₂·2H₂O) to chelate with Cu(Ⅱ) cations. CuSCN films were electrodeposited on transparent ITO conducting substrates from as-prepared electrolyte solution. Deposition mechanisms of CuSCN at varied temperatures have been studied. The results indicate that electron quantum tunnel through CuSCN film plays a role and the dense thin film with nanocrystals was obtained at or below room temperature. However, at higher temperature, a thermally activated process was involved and a thick film was obtained. It has been calculated that the activation energy of the growth for crystals is 0.5 eV. XPS pattern shows that the electrodeposited film is (SCN) in stoichiometric excess, indicating a p-type film. As-prepared CuSCN film was with high transmittance (≥85%) in the visible optical range and the direct transition band gap was 3.7 eV.     

渣油窄馏分的加氢转化特性

利用超临界流体萃取分馏装置，获得了大港常压渣油，沙特阿拉伯轻质原油和中质原油的减压渣油的窄馏分，并分析了ＳＦＥＦ窄馏分的性质。在１００ｍｌ的高压反应釜内，利用破碎的工业Ｎｉ－Ｍｏ／Ａｌ２Ｏ３加氢裂化催化剂，在氢初压８．５ＭＰａ，反应温度４００℃，反应时间２４０ｍｉｎ的条件下，研究了渣油窄馏分的催化加氢转化特性及春变化规律。结果表明，随ＳＦＥＦ馏分变量，其脱硫和脱氮效果明显变差，裂化反应生成汽油，柴     

双组分茂金属催化剂催化乙烯聚合的研究

选择能形成支链的不对称桥联茂金属化合物Me2 C[(Cp) (Ind) ]ZrCl2 和非桥联的不同结构的茂金属化合物二氯二 (烯基取代环戊二烯 )锆如 ( Cp) 2 ZrCl2 ,(Cp) 2 ZrCl2 和 (Cp) 2 ZrCl2 ,以MAO为助催化剂 ,分别组成三组双组分茂金属催化剂的催化体系 ,催化乙烯聚合 .结果表明 ,两类催化剂组成的双组分茂金属催化体系催化乙烯聚合能得到支化的宽分子量分布的聚乙烯 ;聚合温度和改变两种茂金属催化剂的摩尔比对催化活性和分子量有很大影响 .因此可以利用改变双组分茂金属催化剂的摩尔比例和聚合温度来调控聚合物的分子量和分子量分布 .改变两种茂金属催化剂的摩尔比和聚合温度也能使聚合物的结晶度发生改变     

Phase Structures of Nascent Polyethylene Powder Studied by Wideline Proton NMR

The wideline proton NMR spectra of polyethylene powder samples were analyzed in terms of contributions from three components： （1） a rigid part with immobile chains, （2） a soft region with liquid-like character which produces a Lorentzian contribution to the spectrum, and （3） an intermediate region in which the rotation of methylene groups about C-C bonds is partially hindered. The relative mass fractions as well as chain mobilities varied greatly among samples produced by different polymerization techniques. The NMR crystallinity agreed well with that estimated by WAXD and was much higher than DSC crystallinity, indicating an inclusion of the contribution from a crystalline-amorphous interphase. The crystalline defects in the rigid part could be significantly affected by processing parameters when employing the same type of polymerization technique. The intermediate region in the NMR spectra was analyzed according to the comparison between bimodal high density polyethylene and corresponding linear unimodal one. It was found that the mass fraction of the NMR interphase could be an indication of the percentage of tie molecules between crystalline lamellae and thus may significantly affect the mechanical properties of polymeric material.     

n参数d维随机游动(RWdn)

本文研究了ｎ参数ｄ随机游动（记为ＲＷ~ｄ_ｎ）的各种多参数Ｍａｒｋｏｖ性、单 点转移函数和宽过去转移函数，得到了基本型Ｒ叫（Ｂ~１（ｐ，ｑ））的一个弱大数定律．     

Kautz网络中的路和宽距离

用K（d，n）表示Kautz网络，该网络由于具有优良的拓扑性质而频频出现在文献中被广泛研究，本文针对该网络中的路和宽距离得到如下结论：设x和y是中两个不同的顶点，P是一条最短（x，y）-路，Q是一条最短（y，x）-路，那么（1）如果P和Q相交于不同于x和y的内部结点，那么｜P｜＋｜Q｜〉n；（2）PUQ最多由3个圈的并组成；（3）如果有d（x，y）≥n-d＋3，那么（d-1）-宽距离dd—1（K（d，n）：x，y）=n＋1．作为结论（3）的一个应用，本文表明，如果d≥3和他≤d-2，那么独立数al，d-1（K（d，n））=αt，d（K（d，n））=d^n＋d^n-1，其中l=1，2，…，n．