车载激光点云道路标线分类提取方法

利用车载激光道路点云提取道路标线的难度较大。针对此问题,文章采用一种改进的基于点云特征图像的道路标线分类提取方法。首先将道路点云投影生成点云特征图像,通过结合图像梯度分析、图像二值化和连通域分析等操作,进一步进行道路标线像素提取;然后反投影到三维点云后,利用高斯混合模型对道路标线精细优化,从而提取出完整的道路标线点云;最后通过模板匹配分类,对道路标线点云进行分类提取。实验结果表明,该方法对不同道路环境下道路标线提取的准确度、完整度以及综合评价都超过90%。

基于网络构建的仪器分析实验立体化教学研究

针对目前仪器分析实验教学中存在的学生不预习实验、实践机会少、成绩考核和教学评价不能完全量化等主要问题,开展了基于网络平台的、从实验预习到科研应用的仪器分析实验立体化教学研究。学生上网预习实验并考试,教师通过网站出题并分析试卷,找出教学薄弱环节,将“提问互动式”实验教学与网络平台辅助教学有机地结合在一起。经对比实践研究,采用教改方式学习的学生,其平均成绩提高了2.26分,对基于网络的立体化教学对创新型和应用型人才培养起到了积极作用。

疫情防控期间工程学科网络教学评价

通过对工程学科教学方法及特点进行总结和分析,研究了疫情防控期间教学方法的多样性,并对疫情防控期间工程学科教学与网络教学的融合进行分析和研究,提出了工程学科课程教学面临的新问题。从疫情防控期间教学面临的问题、工科类课程面临的新问题以及主要解决办法三个方面,对工程学科网络教学进行分析和评价,并阐述了互联网线上教学的发展前景。

车载点云数据高速公路路面提取方法

利用车载激光扫描数据提取高速公路的道路边界时,不能以路沿作为边界。针对此问题,提出了一种车载点云数据高速公路路面提取方法。根据车载激光扫描数据的特点,设计了逐步提取到精细优化的处理流程。首先,利用改进的RANSAC算法,在条件约束下进行分区自适应阈值粗提取;然后,通过结合RANSAC阈值的形态学滤波和基于点云密度和强度的滤波,进一步进行道路精细提取;最后,利用边缘检测算法对道路边界进行优化,从而提取完整道路点云。利用实际点云数据进行实验,结果表明,该方法提取的道路点云的准确度、完整度、提取质量均超过90%。

Preliminary Analysis of Diesel-Degrading Bacteria Immobilized on Organic Carriers in Seawater

Oil pollution in marine environment is becoming increasingly serious. Oil bioremediation by immobilization technology has been widely studied. However, the effect of bacteria immobilization was limited because of lack of nutrients. In this paper, the organic materials(corn straw, corn cob and corn leaf) were used as carriers. The diesel removal rate achieved by the immobilized bacteria was studied, and the effects of nutrients(e.g. nitrogen and phosphorus) released from organic carriers to the immobilized bacteria were analyzed. Test results indicated that a certain amount of nutrients was released from organic carriers. Additionally, the diesel removal rates achieved by different immobilized bacteria were all higher than those achieved by free bacteria. And, the diesel removal rates achieved by bacteria decreased in the following order: bacteria immobilized on corn straw(79%), bacteria immobilized on corn leaf(70%) and bacteria immobilized on corn cob(43%). These findings indicated two aspects, viz.: the carriers porous structure and the nutrients, which were favorable to biodegradation. Finally, the changes in nitrogen and phosphorus contents that were released from different carriers during biodegradation were studied. The results showed that the rate of diesel biodegradation was fast in the initial phase because of the sufficient nutrients released from carriers. Meanwhile, in the final phase, the rate of diesel biodegradation was relatively slow because of few nutrients released from carriers.

Analysis and Optimisation of Halomonas Growth Factors Based on PCA and RSM

The biomass of petroleum-degrading bacteria, such as Halomonas spp., is crucial to the alleviation of severe oil spills through bioremediation. In this paper, the bacterium(HDMP1) was isolated and identified. Growth factors were analysed and optimised through the single-factor experiments, the factor analysis(FA), the principal component analysis(PCA), and the response surface methodology(RSM). Results indicated that HDMP1 was identified as genus Halomonas. In the single-factor experiments, the range of suitable growth conditions for HDMP1 covered: a salt concentration of 2%-4%, a medium pH value of approximately 9, an inoculum concentration of 1.0%, a substrate concentration of 1.0%-1.4%, and a rotation rate of 140 r/min. The evaluation by FA and PCA indicated that three significant growth factors were the salt concentration, the pH value, and the rotation rate. A maximum biomass of HDMP1 was obtained under the conditions covering a salt concentration of 3.5%, a medium pH of 8, and a rotation rate of 151 r/min by optimization.

微波消解-火焰原子吸收法测定大气颗粒物中的铜、镉

本文采用微波消解法对大气颗粒物进行预处理,通过火焰原子吸收光谱法测定大气颗粒物中重金属铜、镉的含量。微波消解-火焰原子吸收法测定简便,成本低。研究发现,空气中的颗粒物浓度和铜浓度随天气变化而变化,下雨前浓度较高,而镉含量随天气变化不明显。

可动态自适应主题爬虫的研究

针对传统的主题爬虫在面对动态变化的互联网时存在着主题知识涵盖不全、领域知识更新以及主题资源中心转移等问题。论文提出了一种可动态自适应互联网信息的主题爬虫。其中,可动态选择种子URL的TopicHub算法,相比于传统的静态种子URL的主题爬虫,抓取效率提升了7%以上,查全率提升了5%以上。另外,针对于静态本体库所存在的主题信息涵盖不全、领域知识变化更新等问题,提出了一种可动态扩充领域语义信息的结合静态本体库和动态语义的主题算法简称为SDTP算法。相比于传统的基于静态本体库的算法查准率提升了13%,相比于基于向量空间模型VSM的算法提升了4%。

Effects of Different Plant Hormones for Microbial Degradation of PASHs and Diesel under Aerobic Conditions

The effects of plant hormones for biodegradation of polycyclic aromatic sulfur heterocycles(PASHs)and diesel fuel were studied.Indole butyric acid(IBA)and gibberellin were found to promote biodegradation of DBT and diesel,respectively.Concentrations of plant hormones,pH,temperature,soil moisture and substrate concentrations were optimized in microbial metabolic processes.Two main factors including temperature and IBA concentration were determined by factor analysis in DBT biodegradation.And soil moisture and diesel concentration were important factors in diesel biodegradation.Binding sites between cell surface and DBT or diesel components were performed by molecular operating environment(MOE).This study suggested that plant hormones could be applied to effectively remove pollutants in environment.

基于Python的爬虫技术的网站设计与实现

随着爬虫技术的不断完善,其功能越来越强大,也导致数据窃取问题越来越严重。很多网站都采用了反爬虫技术,因此为了正常获取数据,需要一些反爬虫策略。文章设计和实现面向定向网站的网络爬虫程序,使其能满足不同的性能要求,并阐述了定向网站爬虫的细节和应用环节。爬虫可以针对不同的主题网站分析构造URL并去重,多线程技术让爬虫具备更强大的抓取能力。

“互联网+”背景下基于微课的翻转课堂个性化自主学习实践研究

"互联网+"时代背景下对基于微课翻转课堂个性化学习进行了研究,梳理了国内外已有研究成果,探索了新的研究切入点。以广东环境保护工程职业学院为例,阐述在"互联网+"背景下以工作岗位职业能力为主线的自主学习任务单的实践研究与设计。

LIMS实验室信息管理系统的设计与开发

环境监测方面也在面临着巨大的压力,大量的监测任务,员工人手的不足,监测范围的扩大,对于环境监测行业来说都是一个挑战。而以往的LIMS实验室信息管理系统存在着很多不足,在这种条件下,以往的系统已经无法满足现在的工作需要,在传统LIMS实验室信息系统的基础上,把不足之处加以完善在结合我们独有的特性,在每个流程阶段内每个人员能够及时得到沟通,从而对报告进行实时修改。