Synthesis and Characterization of Poly[ 2, 2- （m-phenylene） -5, 5-bibenzimidazole ] in 1-butyl-3-methylimidazolium Chloride

Poly[2,2-(m-phenylene)-5,5-bibenzimidazole](mPBI)were synthesized by mixing 3,3’,4,4’-tetraaminobiphenyl and isophthalic acid in 1-butyl-3-methylimidazolium chloride([BMIM]Cl).Intrinsic viscosity of mPBI polymers was 0.67 dL/g which was measured in 96%sulfuric acid.The polymer was characterized by Fourier transform infrared spectroscopy(FTIR),nuclear magnetic resonance(1H-NMR),and thermogravimetric analysis(TGA).The effects of polymerization conditions on the intrinsic viscosity of mPBI were investigated.It showed that the molecular weight of polymer mainly depended on pre-reaction time and reaction temperature.Comparison of structure and properties of mPBI synthesized in ionic liquids(ILs)and polyphosphoric acid was also reported.It indicates that the ionic liquids are a kind of good solvents in synthesis process of mPBI and ionic liquids mainly affect molecular weight of mPBI.     

光纤Bragg光栅的制作及其应用

光纤Bragg光栅是一种新型的光无源器件,伴随着制作技术的成熟,已成为当今的研究热点问题。根据学校对光纤Bragg光栅所开展的研究,该文介绍了光纤Bragg光栅的制作方法、在光纤激光器中的应用以及光纤Bragg光栅传感器测重实验。指出高校应紧紧围绕科技前沿研究开设实验,以达到开阔学生视野,培养社会急需高科技人才的目的。     

水稻萌发期耐Cu2+胁迫的QTL定位

以典型籼粳交(春江06/台中本地1号)双单倍体(DH)群体为材料,经100μmol/L CuSO4溶液对其双亲及DH群体进行处理,考察了DH群体及其双亲的耐铜性,并利用业已构建的分子连锁图谱进行了数量性状基因座(QTL)区间分析.共检测到23个QTLs,其中与铜胁迫有关的QTL有7个,分别位于水稻第1,2,3和7染色体上;贡献率最大的QTL为qTGR-2,变异解释率为14.60%,其增效等位基因来自台中本地1号;芽质量的QTL qTSW-1增效等位基因来自春江06;余下的几个耐铜胁迫的QTL增效基因均来自台中本地1号.同时,在3号染色体上检测到了一个QTL,可显示发芽率受铜胁迫抑制的程度.     

一种支持智能环境构建的中间件

在普适计算领域中,中间件已经成为分布式智能环境开发的关键.基于＂不动机器人＂的概念,介绍一种中间件ROS.以ROS为核心,构建了一个典型智能环境,并在信息服务能力、系统集成能力和环境感知能力3个方面对该中间件进行了实验验证.结果表明用于机器人开发的中间件在智能环境构建中具有有效性.     

电流互感器饱和特性仿真

在正常运行情况下,电流互感器能够保证所在电气回路电流量的准确传变。但是,由于电流互感器中存在非线性的电磁元件,当故障发生时,非线性元件会对互感器的暂态响应特性产生不良影响,致使电流互感器的二次侧无法如实反映一次侧电流的变化情况。因此在编写仿真程序时,要得到实际磁化曲线,将非线性电感分段线性化,来模拟电流互感器的二次侧输出。     

Dynamic threshold for SPWVD parameter estimation based on Otsu algorithm

Time-frequency-based methods are proven to be effective for parameter estimation of linear frequency modulation （LFM） signals. The smoothed pseudo Winger-Ville distribution （SPWVD） is used for the parameter estimation of multi-LFM signals, and a method of the SPWVD binarization by a dynamic threshold based on the Otsu algorithm is proposed. The proposed method is effective in the demand for the estimation of different parameters and the unknown signal-to-noise ratio （SNR） circumstance. The performance of this method is confirmed by numerical simulation.     

Range anomaly suppression based on neighborhood pixels detection in ladar range images

Research on the range anomaly suppression algorithm in laser radar (ladar) range images is significant in the application and development of ladar. But most of existing algorithms cannot protect the edge and linear target well while suppressing the range anomaly. Aiming at this problem, the differences among the edge, linear target, and range anomaly are analyzed and a novel algorithm based on neighborhood pixels detection is proposed. Firstly, the range differences between current pixel and its neighborhood pixels are calculated. Then, the number of neighborhood pixels is detected by the range difference threshold. Finally, whether the current pixel is a range anomaly is distinguished by the neighborhood pixel number threshold. Experimental results show that the new algorithm not only has a better range anomaly suppression performance and higher efficiency, but also protects the edge and linear target preferably compared with other algorithms.     

基于迭代式RELIEF和相关向量机的黄瓜图像识别方法

针对目前采摘机器人在图像处理实时性以及识别准确率方面的要求,提出一种基于迭代式RELIEF(I-RELIEF)的相关向量机的算法.该算法首先通过将获取到的样本像素信息输入到I-RELIEF的模块中,计算出样本信息中各特征在分类过程中的权值,即各特征对类别的影响程度;然后将带权值的样本信息输入到相关向量机的算法模块中进行训练后得到像素分类器;最后用得到的分类器去预测未知像素来对像素进行分类,实现对黄瓜果实图像的分割.实验结果表明,这种图像像素分类器对于温室条件下的黄瓜像素的识别率达到80%以上,误识率不到27%,两者的比值达到3.0以上.     

基于STM32的STC单片机脱机下载器的设计与实现

为了解决STC单片机程序快速高效升级的问题,提出了基于STM32的STC单片机脱机下载器的方案.用SD卡做为存储介质,存储目标程序文件.在STM32上实现STC单片机的ISP下载协议,将SD中的程序文件下载到目标板中.介绍了下载器的硬件原理、STC单片机下载协议和下载器的软件设计方法.