基于时隙序列的数据链模拟系统研究

本文针对Link16数据链的TDMA结构,从概念原理上进行了论述,对如何实现战场态势的精确时间模拟作了深入的研究,并进行了仿真验证。     

基于PIC16F676的太阳能控制器

设计一套简易太阳能控制器,可方便控制蓄电池的充放电。该控制器采用低功耗的PIC16F676型单片机作为整个控制电路的核心．实时监测、控制蓄电池两端电压,使用液晶屏直观显示其电压和电量,采用温度补偿二极管克服环境温度变化引起的蓄电池端电压变化,并采用“自适应三阶段”充电模式,通过不同条件下调用相应的充放电子程序．以最佳的方式对蓄电池进行充放电,更好保护了蓄电池。     

16PSK系统仿真及误码率性能分析

为实现16PSK应用到无线激光通信中,本文对16PSK系统性能进行了理论研究。介绍了16PSK调制解调原理,对两种不同信道的系统性能进行了研究,分析对比了在两种信道下的系统误码性能。为基于副载波16PSK无线激光通信系统的研究奠定了理论基础。     

渤海海域旅大16构造沙三段沉火山碎屑岩储层物性及形成机理

渤海海域旅大16构造沙三段沉火山碎屑岩储层受火山碎屑物质和沉积作用双重控制,但优质储层形成机理尚不清楚。综合应用井壁取心、铸体薄片、测井曲线等资料,对沉火山碎屑岩储层致密成因及相对高渗储层主控因素进行了研究。结果表明:临近物源区的储层岩石成分成熟度和结构成熟度较低,成岩过程中形成大量搭桥状伊利石充填了孔隙,富铁、镁的安山岩岩屑蚀变析出细小黄铁矿晶簇,呈星散状密集分布在粒间,储层中毛管束缚水含量高是储层致密的主要成因;沉积期风化淋滤作用及后期成岩作用形成的高岭石对储层起到支撑和保护作用,酸性火山岩岩屑在埋藏过程中生成大量环颗粒分布的雏晶石英,能够起到抗压实和抑制伊利石生长的作用,酸性火山岩岩屑相对易溶蚀而形成次生孔隙,是局部相对高渗储层的主要成因。     

Species identification of dried scallop adductor muscle (yao zhu) products sold on the market

Dried scallop adductor muscle, known as yao zhu, has been ranked in the list of the eight sea treasures in Chinese cuisine, it has been commonly recommended and consumed in China over many centuries due to its delicious taste and abundant nutrition. However, the true species composition of the dried scallop adductor muscles in the trade is unclear. Indeed, it is difficult to identify the scallop species just based on their morphological characters of processed adductor muscles. In this study, 60 yao zhu products commercialized in Chinese market were analyzed in order to authenticate species. Direct sequencing and BLAST method based on a fragment of the 16S rRNA gene were carried out and results showed that 34 products (56.7%) were scallop species Argopecten irradians, and other 26 products (43.3%) were the scallop species Mizuhopecten yessoensis, indicated the yao zhu market were dominated by the both species, which were the introduced aquaculture scallop species. Moreover, a simple and fast PCR method proved to be capable of unequivocal identification between the two species. Therefore, this work facilitates the identification of yao zhu products in the market, support of food control and protection of consumers’ rights.     

16＊16点阵LED的设计

设计一个16＊16的LED点阵作为显示屏的最小模块,控制器采用AVR单片机,还有相应的驱动芯片74LS154和74LS595分别作为点阵LED的行选和列选,设计电路简单可靠,可扩展,级联,能够作为LED显示屏设计的最小模块。     

Studies in an optical millimeter-wave generation scheme via two parallel dual-parallel Mach–Zehnder modulators

A novel filterless optical millimeter-wave generation scheme via two parallel dual-parallel Mach–Zehnder modulators (MZMs) is proposed. Theoretical analysis suggests that it can be used for the generation of millimeter-wave signal with octupling or 16-tupling of the local oscillator. An 80?GHz millimeter-wave is generated by octupling of a 10?GHz RF oscillator, or 16-tupling of a 5?GHz RF oscillator. Several influence factors on the performance of the optical sideband suppression ratio (OSSR) and the radio frequency spurious suppression ratio (RFSSR) are numerically studied. Simulation results show that the generated millimeter-wave can keep good performance, especially for octupling millimeter-wave generation; its performance is stable and insensitive to the extinction ratio of MZMs and the DC bias drift.     

矿井低压电网选择性漏电保护 系统总体设计与实现

设计了一款以dsPIC30F4012为主控制器、PIC16F877A为从处理器的新型主从式选择性漏电保护系统。该系统在总开关处采用附加直流源检测原理检测是否发生漏电,在分支开关处使用零序功率方向检测原理判断发生漏电故障线路,给出了保护系统的硬件框图和软件流程图,并且采用速度更快的RS-485总线及光纤传输技术,实现了矿井低压电网漏电的保护的瞬动性。实验结果验证了该保护系统的优越性能。     

Metal Chalcogenide Clusters on the Border between Molecules and Materials

The preparative and materials chemistry of high nuclearity transition metal chalcogenide nanoclusters has been in the focus of our research for many years. These polynuclear metal compounds possess rich photophysical properties and can be understood as intermediates between mononuclear complexes and binary bulk phases. Based on our previous results we discuss herein recent advances in three different areas of cluster research. In the field of copper selenide clusters we present the synthesis of monodisperse, nanostructured α‐Cu₂Se via the thermolysis of well‐defined cluster compounds as well as our approaches in the synthesis of functionalized clusters. In case of silver chalcogenides we established a strategy to synthesis cluster compounds containing several hundreds of silver atoms with the nanoclusters arranging in a closely packed crystal lattice. Finally the presented chalcogenide clusters of the group 12 metals (Zn, Cd, Hg) can be taken as model compounds for corresponding nanoparticles as even the smallest of frameworks display a clear structural relationship to the bulk materials.     

一种图像处理的全自动焦度计

为了提高全自动焦度计的测量精度和适应性,提出了一种测量图形和计算方法。该研究方法是首先利用脉冲恒流驱动的红外光将16点图像经光学系统投射到面阵CCD上,然后经高速CPU系统采集处理,变成二值化图像,最后用最小二乘法计算出镜片的屈光参数。实验用标准镜片、划伤镜片和镜片落灰尘进行了测试,同四点测量图像进行了比较,实验结果表明标准镜片误差小于国家计量规定屈光度检查最小误差±0.06 D,且都符合国家计量标准,划伤镜片和镜片落灰尘时测量精度明显提高,环境适应性也大大提高。