微小型四旋翼无人机自主着陆视觉系统研究

以实现微小型四旋翼无人机依靠视觉信息完成自主着陆为目的,采用TI公司DM3730芯片作为核心处理器,构建一套自主着陆视觉导引信息处理系统;充分考虑了视觉系统的特点,选用小巧、便携、合理的实验硬件,通过对图像的前期处理,采用相对简单的视觉处理算法,识别出着陆标识,通过解算得到着陆信息并完成飞行器的自主着陆过程;实验结果表明,系统较为可靠,在常规条件下,该系统能够有效识别人工着陆标识,准确解算出着陆标识与飞行器的相对位置信息用于自主着陆导引。     

绿茶的色谱指纹谱分类模式初探

以绿茶的数字化色谱指纹谱为基础,探讨用指纹谱来分类绿茶的新模式。各批次绿茶样品间的两两重叠率可作为筛选构建特征指纹谱样品的依据,14个绿茶样品按照特征指纹检出率和总差异率的不同初步划分为3个级别。本法从内在组成上为绿茶的分类提供了一个客观量化的界定标准,有别于过去凭借外形口感的经验评估,可为茶叶乃至自然界其它植物的化学分类提供新的视角。     

Solvent Synthesis,Growth Mechanism and Photocatalytic Properties of AgInS_2 Nanoplate and Nanoparticle

Orthorhombic AgInS_2 nanoplate and nanoparticle were synthesized using pyridine and 1-dodecanethiol as the solvent.The obtained products were characterized by X-ray diffraction(XRD),field-emission scanning electron microscope(FESEM),field-emission transmission electron microscope(FETEM),and the possible growth mechanism of AgInS_2 was also proposed by the exploration of reaction temperature and time.Meanwhile,the bandgap of AgInS_2 was calculated by the UV-Vis diffuse reflectance spectrum,and the photocatalytic activity was also investigated.Those experimental results indicate that the reaction temperature,reaction time and solvent have an influence on phase and morphology of AgInS_2,and both AgInS_2 nanoplate and nanoparticle have some ability on photocatalytic degradation of organic dyes under UV-Vis light irradiation.     

基于DM3730的微小型四旋翼自主着陆视觉系统研究

为实现微小型四旋翼无人飞行器的视觉导引自主着陆过程,采用TI公司DM3730芯片作为核心处理器,构建一套自主着陆视觉导引处理系统。手动飞行实验结果表明,在常规条件下,该系统能够有效识别人工着陆标识,并解算出其与飞行器的相对位置信息用于自主着陆导引。