传感器感知盲区条件下智能汽车主动制动系统控制研究

传感器感知盲区是造成智能汽车交通事故的主要原因之一。为了降低传感器感知盲区对智能汽车主动安全性能的影响,对传感器感知盲区条件下的智能汽车主动制动系统控制进行了研究。首先,建立感知盲区数据库,并搭建卷积神经网络对其进行识别;其次,根据其运动特征进行分类,建立感知盲区条件下的安全距离模型;最后,基于上述安全距离模型对感知盲区内的潜在障碍物进行自车速度控制,达到主动避撞的目的。仿真和实车试验表明,提出的传感器感知盲区分类可以较好地表述感知盲区的运动特征,传感器感知盲区条件下的主动避撞安全距离模型对潜在障碍物有较好的预防作用,主动避撞算法提高了智能汽车在传感器感知盲区内的主动安全性能。     

Large scale reforestation of farmlands on sloping hills in South China karst

Landscape Ecology - South China karst is undergoing large scale land-use conversions driven by reforestation projects aiming at combating land degradation. However, the spatial extent of these...     

草莓镶脉病毒ORF I基因的克隆、原核表达及抗血清制备

The total DNA was extracted from strawberry leaves infected with Strawberry vein banding virus (SVBV) by CTAB method. Specific primer pairs were designed to amplify the gene ORF I of SVBV-Shenyang isolate by PCR, gene ORF I was cloned into modified prokaryotic expression vector pET-32a (+)-GST, the recombinant plasmid pET-ORF I was transformed into E. coli DH5α, then the positive clones were screened and sequenced. The recombinant plasmid was extracted and transformed into Escherichia coli BL2l (DE3), the fusion protein with an approximate molecular weight of 56 kDa was obtained with IPTG induction and Ni²⁺-NTA affinity column purification. The purified fusion protein was used to immunize the rabbits to prepare the specific antiserum. The result of ELISA showed that the titer of the prepared antiserum is up to 1:520 000, Western blot analysis indicated that the prepared antiserum could reacted specifically with purified recombinant fusion protein. Not only the expression of P1 protein in SVBV infected-strawberry leaves, but also the expression of P1 protein in P1-infiltrated Nicotiana benthamiana leaves could be detected, using 2 000 times diluted antiserum.     

昆虫视蛋白的研究进展

昆虫是地球上种类最为繁多的生物,具有发达和敏感的视觉系统。昆虫视蛋白是一种膜蛋白,是昆虫视觉系统的重要组成部分。根据是否直接参与视觉成像,可将昆虫视蛋白分为视觉视蛋白和非视觉视蛋白两大类。昆虫视蛋白在视觉成像和生物钟昼夜节律同步调节等方面发挥着重要作用。本文在系统分析国内外文献的基础上,主要对目前已报道的昆虫视蛋白的种类、表达特征、分子结构、生物学功能、吸收光谱的分子机制和分子进化等方面进行综述。     

基于形态与分子数据鉴定海榄雌瘤斑螟

海榄雌瘤斑螟目前是红树林植物白骨壤的重要害虫,其种类在国内存在争议。本研究对福田红树林自然保护区内采集到的螟蛾标本进行了形态学鉴定,同时应用DNA条形码技术进行了进一步确认。本文将海榄雌瘤斑螟样本的线粒体COI序列与数据库中已有序列比对,结果显示海榄雌瘤斑螟COI序列与GenBank数据库中3条P. synataractis和BOLD系统中的32条P. syntaractis序列同源性达98%以上;构建的系统发育树显示福田红树林自然保护区内采集的标本与P. syntaractis聚为一支。综合形态和分子数据确定海榄雌瘤斑螟为P. syntaractis (Turner,1904)。     

Conbination of On-line Methods and Off-line Methods for On-line Recognizing Un-constraint Handwritten Numerals

In this paper, we propose a scheme of recognizing un-constraint handwritten numerals,in which on-line methods and off-line methods are combined. This scheme inherits the good quality,and overcoming the defect of both on-line methods and off-line methods. Experiments show the scheme has achieved impressive performance and the preliminary results are very encourgine for recongnizing un-contraint handwritten numerals.     

昆虫生长调节剂防治黄脊竹蝗的室内药效试验

５种昆虫生长调节剂防治黄脊竹蝗（Ｃｅｒａｃｒｉｓｋｉａｎｇｓｕ）１～２龄跳蝻的室内药效试验结果表明：灭幼脲３号、卡死克和抑太保对跳蝻的致死作用较大;灭幼脲３号增效粉剂有明显的速效作用     

广东大豆地方种质磷效率特性研究Ⅰ.大豆基因型磷效率特性差异及其与土壤有效磷含量的关系

在低磷红壤上,对原产广东省的大豆基因型磷效率与其来源地土壤有效磷含量的关系进行研究。结果表明：植株磷素吸收量相对值不仅可以反映大地低磷红一长适应性,而且可以反映大豆基因型磷效率特性,ＲＶＰＰＵ是较大的大豆基因型。     

“扬麦1号”春小麦单体系统的培育

<正> 从1978年开始,在“中国春”小麦单体系统的基础上,经连续6～7次回交转育,育成了适于我国南方麦区生长的“扬麦1号”单体系统。衍生单体的穗形及其它特征与“扬麦1号”相似,核型均为2n-1=20”+1’=41。经用“中国春”双端着丝体系统(2n-1”+t”=20”+t”)对育成的21个单体系分     

化学杀雄在小黑麦制种上的应用研究

乙烯利和三嗪二酮都是目前我国生产的较好的小麦杀雄剂,用乙烯利4000ppm+二酮4000ppm 混合液,从花粉母细胞形成-花粉双核期喷施,比单一药剂喷施药害较轻,有效喷药期长,不育率可达80～90%,雌芯受精能力亦不受影响。小麦与桥梁品种的杂种,经化学杀雄后在隔离区中与黑麦自然授粉,可获得大量的杂种。这不仅可节省人力和时间,而且