气吸式巴旦木壳仁风选装置试验与优化分析

[目的]研究采用气吸式原理研究设计气吸式巴旦木壳仁风选装置,并采用软件参数优化,为巴旦木壳仁风选装备研发与优化提供理论参考.[方法]运用有限元软件Fluent18.0,对风腔三维模型进行流体仿真,风腔内部形成局部湍流现象,调节风腔过渡口相对位置适当提高清选效率.运用数据分析软件Design Expert对风选试验数据分...     

采后甘蓝单体排序定向输送装置设计与试验

针对采后甘蓝人工上料及定向排序劳动强度大、生产效率低、人工成本高等问题,结合采后甘蓝商品化处理工艺及转动惯量特性,设计了采后甘蓝单体排序定向输送装置.该装置采用气缸传动对空间堆叠状态的采后甘蓝进行翻转卸料,随后在单层喂入辊和曲面缓冲轨道作用下采后甘蓝呈单层状态排出,再经限位辊和变螺距输送辊引导完成采后甘蓝的单体排序输送...     

基于多特征降维的油茶果壳籽粒的分选识别

针对目前株洲丰科林业装备有限公司智能–1型油茶脱壳机中分选识别系统存在的识别方法单一、受分选目标颜色影响大、自适应功能较差等问题，建立了基于多特征降维的油茶果壳籽粒的分选识别方法：提取油茶果壳籽粒的6维形态和颜色特征；根据这些特征的特性采用降维的方法，以保证算法的识别效率；将降维方法融入人工免疫网络算法中进行算法模型的辨识。选用颜色特征区分较明显的分别已晾晒3 d和12 d的油茶果进行采集分选，通过降维优化得到2分量、4分量与6分量的3 d晾晒样本识别率均值达70%、80%、90%；晾晒12 d的识别率均值达50%、60%、75%；晾晒3 d识别时间均值为60 ms、350 ms、450 ms；晾晒12 d的识别时间均值为80 ms、420 ms、480 ms。     

茄科蔬菜多株同步自动嫁接机设计与试验

以茄科蔬菜穴盘苗为作业对象，开展了多株蔬菜同步自动嫁接技术及关键机构研究。提出了基于劈接法的茄科蔬菜六株同步自动嫁接机的整机结构方案，该机可连续实现穴盘苗自动进给、砧穗木的切削与插接、嫁接夹的定向排序与持送上夹等功能。重点设计了嫁接机的砧木平切机构、砧木劈切机构、穗木推切机构、砧木与穗木插接机构、振动排序供夹装置及持送上夹机构等关键机构，确定了各机构的主要结构参数。以辣椒苗为嫁接对象，开展了六株同步嫁接机切削质量正交试验，试验结果表明，提高对苗株的夹持精度和切削速度及较小的茎秆纤维硬度有利于提高切削质量。当切削速度为1.5 m/s时，嫁接期辣椒苗样机性能验证试验结果表明，砧穗木切削合格率98.6%、嫁接合格率97.1%、嫁接成活率96.2%、嫁接效率720株/h,达到了设计要求。     

融合新词发现和改进TextRank的农业领域关键词提取算法

针对农业领域文本中专业术语类关键词提取困难的问题，本文提出了一种融合新词发现和改进TextRank算法的农业领域关键词提取方法，该算法通过信息熵对文本中的词进行成词概率计算，以此发现领域专有名词和新词，通过人工审核扩充分词字典；同时，在分词字典基础上，改进TextRank算法在词图构建中节点值的计算方法，添加词语位置和词性权重，利用词语综合权重提取文本关键词。通过实验对比，本研究的算法在F值上比传统的TF-IDF算法平均提高了7.5%，比TextRank算法平均提高了9.8%，具有一定的实用性。     

社会资本对农村居民生活垃圾分类的影响研究

农村居民是生活垃圾源头分类的主体，其分类意愿与行为直接关系到生活垃圾分类的成效，关系到美丽乡村建设的成败。基于太湖流域农村居民调研数据，运用Ordered Probit模型和OLS模型，探讨了社会资本对农村居民生活垃圾分类的影响及作用机理。结果表明，当前，太湖地区农村居民的不同维度社会资本得分存在一定差异性，并且在生活垃圾分类方面，88.6%受访居民愿意分类，但仍有部分受访居民表现出“意愿强行为弱”现象。社会网络、社会信任、社会规范等不同维度社会资本对农村居民生活垃圾分类意愿和行为具有不同程度的正向影响。从作用机制来看，社会资本通过提升农村居民的环保认知水平，进而提升其生活垃圾分类意愿和行为。从异质性来看，在不同年龄、学历和收入群体中，各维度社会资本的影响具有一定差异性。因此，本文提出强化农村基层组织网络建设，树立自主分类责任意识，建立群体监督规范体系，多维度、全方位提升社会资本积累，因地制宜地形成生活垃圾分类治理体系等对策建议。     

Negotiating the green obstacle course: Ranking priorities and problems for municipal green infrastructure implementation

This paper sets out the results of a study exploring, and ranking in order of perceived significance, the priorities and obstacles faced by smaller cities when implementing green infrastructure (GI) projects. The study captured the views of 49 municipal officers and elected representatives in cities of less than 500,000 population across four countries in northwest Europe, using a closed card sorting methodology as part of a semi-structured interview format. The results show a clear hierarchy in priorities, with particular attention paid to anthropocentric benefits to residents, especially the importance of aesthetics and liveability as a key objective in GI delivery, and the desirability of securing visible benefit to residents within the electoral cycle; longer-term objectives linked to environmental and economic challenges, although acknowledged in corporate policies, attract a lower priority when it comes to delivery, and may encounter trade-offs against other desired benefits. The greatest obstacle to GI delivery is not funding, as found in other studies, although this remains significant; rather, it is difficulty of collaborations and fragmentation within the city organisation which participants attributed to a lack of leadership and prioritisation of green initiatives. Capacity is also a clear issue, and the results highlight a lack of resources (including funding) but also skills in assembling evidence in support of projects, and staff time to bid for and deliver new GI proposals. When comparing these findings to others from larger cities, particularly those with a population over 1 million, the results suggest differences in prioritisation, critical mass, resources and capabilities and capacities influencing GI implementation, these are important to consider as they may prevent transferability of GI best practices from larger cities, who tend to be more active and innovative, to smaller scale cities. Co-production of knowledge, could offer considerable potential to improve GI implementation, but the design of any such schemes should recognise the issue of capacity by providing resources to allow participation of practitioners in smaller municipalities. Finally, respondents highlighted increasing environmental awareness of local communities and whilst the effect of this is yet to be seen, this was considered as having considerable potential in improving GI implementation in smaller municipalities.     

基于改进SSD的棉种破损检测

为实现群体棉籽的破损检测,以新路早-50#脱绒棉籽为研究对象,将群体棉籽随机摆放,使用CCD相机采集群体棉籽的图像,在经典的单步多框检测(single shot multibox detector,SSD)算法上进行改进.基于改进SSD,利用ResNet 50网络代替经典SSD算法中的VGG网络,将ResNet50作为...