基于卷积神经网络的拖拉机工况识别     

孔庆好  吐尔逊·买买提  赵梦佳 《中国农机化学报》2021,42(11):144

农机工况识别在细化农机作业状态和帮助掌握区域污染物排放趋势方面有着重要的研究价值。基于拖拉机不同运行状态下的行驶速度、发动机转速以及实时油耗等时间序列,首次提出将图像识别方法引入到拖拉机工况识别中的思路,并分别应用参数优化的支持向量机与卷积神经网络对实际作业拖拉机工况进行研究。结果表明:(1)基于参数优化的支持向量机可以较好地实现样本点的工况识别且识别准确度达到99.851 9%,但无法实现农机工况的连续性识别,同时无法对农机工况转换阶段进行有效识别。(2)以拖拉机运行速度与发动机转速等信息构建样本图像来描述农机工况变化的数据表达,并在此基础上应用卷积神经网络可以有效实现农机工况的连续性识别,且识别准确率可以达到93.3%。本研究在农机工况识别方面具有一定参考价值,并为后续农机不同工况下区域污染物排放研究提供技术支持。  相似文献   

西北干旱区生态环境建设支撑体系的构建   总被引：6，自引：2，他引：6  

钱鞠  王根绪  马金辉  高前兆 《干旱地区农业研究》2003,21(1):102-107,138

西北干旱区的自然环境脆弱性叠加不合理的水土资源开发等人类活动干扰是导致区域生态环境日趋恶化的根本原因,已严重制约社会经济的可持续发展。针对当前生态环境建设实际,提出应在实现水资源可持续利用、建立完善的管理体制及法律体系、调整产业结构、积极推进城镇化进程、大力发展科技教育等方面采取有力措施。以此为重要支撑,恢复与重建受损生态系统,改善区域生态环境,实现环境与经济社会协调发展。  相似文献   

Challenges in developing and implementing a decision support systems (ETÇAP) in forest management planning: a case study in Honaz and Ibradı, Turkey     

Emin Zeki Başkent  Ali İhsan Kadıoğulları 《Scandinavian Journal of Forest Research》2014,29(7):121-131

Decision support systems (DSSs) are indispensable tools in preparing a forest management plan for a better combination of multiple forest values. This study attempted to develop and explain a stand-based forest management DSS (Ecosystem-based multiple-use forest planning [ETÇAP]) comprising a traditional simulation, linear programming (LP), metaheuristics and geographic information system. The model consists of five submodels; traditional management approach to handle inventory data, an empirical growth and yield model, a simulation to conceptualize management actions, a LP technique to optimize resource allocation and a simulated annealing approach to directly create a spatially feasible harvest schedule. The ETÇAP model has been implemented in a comparative two case study areas; Denizli–Honaz and Akseki–Ibrad?. Both simulation and optimization models outperformed to the traditional management plan. The periodical change of growing stock, allowable cuts, carbon sequestration and water production are used as performance indicators. The results showed that more amount of wood could be harvested over time compared to traditional level of harvesting. It could be concluded that various management strategies allowed managers to stimulate more decision options for better outputs through intertemporal trade-offs of management interventions as the model provided tools to quantify forest dynamics over time and space. Challenges exist to establish the functional relationships between forest structure and values for better quantification and integration into the management plans.  相似文献   

钢支撑代替混凝土支撑可行性分析     

汪磊 《山东饲料》2015,(8)

在地铁深基坑施工中，围护结构对基坑的安全起着至关重要的作用。本文依据合肥地铁一号线明光路站，施工过程中，由于车站3号出入口为出土口，原计划的第一道钢筋混凝土支撑无法实现，更改为钢支撑，通过有限元分析软件MIDAS-GTS\NX，建立二维模型进行数值模拟，对围护结构的变形和地表沉降进行分析，结果表明：第一道支撑采用钢支撑代替钢筋混凝土支撑对围护结构的侧移值影响不大，钢筋混凝土支撑控制地表沉降的效果要比钢支撑好，对今后类似工程变更提供依据。  相似文献   

多项目管理理论在水库移民后扶项目中的初步研究     

史静  李乾  薛晓燕  张志明  于文琳 《安徽农业科学》2015,(25):328-329

结合水库移民工作实践经验,构建了后扶项目多项目管理组织机构并初步分析了多项目管理在后扶项目管理中开展方法.  相似文献   

《青岛市新型职业农民培育管理办法》立法调研报告     

赵立波  王荣祯  焦修伟  鹿淑梅 《安徽农业科学》2016,(16)

为了促进和规范新型职业农民培育工作,提高农民科学文化素质和从业能力,加快培育新型职业农民和现代农业新型经营主体,青岛市农委将《青岛市新型职业农民培育管理办法》列入2013~2015年青岛市立法论证和调研计划。调研组于2013年3月至2016年3月,通过查阅文献资料、实地调研、问卷调查、召开座谈会等方式开展立法调研工作,认为《青岛市新型职业农民培育管理办法》政府规章的出台十分必要。  相似文献   

牧草产业是我国家兔产业可持续发展的重要支撑     

张凯  刘汉中  鄢家俊  余志菊  王丽焕  文斌  刘宁 《四川草原》2011,(1):41-43

针对我国家兔规模化养殖的快速发展,牧草作为家兔生产主要饲料原料来源,供需矛盾日益突出。本文重点从家兔消化生理特点、兔产品安全生产、农民增收、需求现状与问题等方面进行了论述,并提出了相应对策。  相似文献   

Four years validation of decision support optimising herbicide dose in cereals under Spanish conditions     

《Crop Protection》2014

The Danish decision support system Crop Protection Online (CPO) optimises herbicide weed control. CPO recommends specific herbicide solutions to achieve a required level of control. The aim is to apply herbicides as little as possible but as much as necessary. CPOWeeds is a version of CPO adjusted to conditions in North-eastern Spain. The predicted efficacies and the yield obtained with CPOWeeds were validated in winter cereal field trials from 2010 to 2013. All CPOWeeds treatments were related to the efficacies obtained with standard herbicide treatments decided upon by local advisors. The predictions from CPOWeeds were compared to the actually achieved efficacies in the field trials for the nine weed species at different developmental stages and for 84.2% of the comparisons the obtained efficacies were equal to or higher than predicted. The average difference between predicted and observed efficacies was 2.35 percentage points. Yield was measured in three trials and the recommendations from CPOWeeds were maintaining yield. There were two situations where CPOWeeds were performing suboptimal. One is in the early weed growth stages, as the model is not yet prepared to account for water stress on root action herbicides applied at 10-11 BBCH. The second situation was in fields with a prior unidentified population of resistant Alopecurus myosuroides. For key species in winter cereals in Spain, such as Avena sterilis, Lolium rigidum and Papaver rhoeas, CPOWeeds achieved a satisfactory control level. It was concluded that the use of CPOWeeds allowed optimisation of the herbicide application with a very high robustness. The recommendations were satisfactorily for the conditions of the Northeast of Spain and have the potential to decrease the amount of applied herbicides by at least 30%. Therefore, it can be an important tool in Integrated Weed Management.  相似文献   

基于支持向量机的农机装备水平差异分类研究     

袁玉萍  安增龙 《中国农业大学学报》2015,20(4):167-173

针对黑龙江垦区各农场农机装备水平不平衡差异问题,采用支持向量机多类分类和主成分分析相结合的方法进行研究。将农机装备水平分为3个等级水平,从总量、速度和均量3方面选取10个评价指标;采用主成分分析法确定5个主要合成指标;建立多类分类支持向量机新模型,把新模型转化成一个互补问题,利用Lagrangian隐函数进一步转化成一个强凸的无约束优化问题,采取快速牛顿算法进行求解;利用实证调研数据,从发展差异度的角度对黑龙江垦区98个农场农机装备水平的差异进行多指标分析,在分类的准确度和训练速度方面都有很好的表现。  相似文献   

基于ansys的支座结构优化设计     

张浩强 《湖南农机》2016,(2)

建立了支座优化分析的数学模型，选用solid92单元进行网格划分，对支座筒体内孔的下半部分施加15E6Pa的压力。选择支座筒体外径为设计变量，支座位移和为状态变量，并设置最小值为0.35mm，支座体积为目标函数。采用零阶方法进行优化计算，得到满足许用应力和位移和的最小筒体外径。  相似文献