检索结果-南通市图书馆

Development of a high-productivity grafting robot for Solanaceae

International Journal of Agricultural and Biological Engineering 2020年第1期13卷 82-90页

作者： Zhongjian Xie Song Gu Qi Chu Bo Li Kaijun Fan Yanli Yang Yi Yang Xiaogeng Liu College of Engineering South China Agricultural UniversityGuangzhou 510642China College of Electronic Engineering South China Agricultural UniversityGuangzhou 510642China Key Laboratory of Key Technology on Agricultural Machine and Equipment Ministry of EducationSouth China Agricultural UniversityGuangzhou 510642China Guangzhou Sky Mechanical&Electrical Technology Co.Ltd Guangzhou 510642China

Grafting is a green,environmentally friendly,and sustainable way to prevent soil-borne *** artificial grafting is the main grafting approach used for grafting production,it has some problems which are low productivity,unstable operating quality and ***,some countries have been engaged in the development of grafting robots for the past two decades;however,the productivity of these grafting robots has no advantage when compared to artificial *** study aims to develop a high-productivity grafting robot(HPR)for *** improve grafting productivity,this paper adopted plug trays to feed crown-removed rootstocks automatically and carried out multi-plant simultaneous grafting to improve grafting productivity and *** were employed to take out rootstocks,increase the distance between them,and transfer them to transfer cups for the simultaneous multi-plant *** the same time,negative pressure mechanisms were designed for speeding up the auxiliary feeding of root-removed *** the HPR was designed in a two-operator mode,a one-operator mode can also be implemented by adjusting the control *** were conducted by varying the artificial feeding speed to analyze the performance of the grafting *** results showed that the productivity of the robot in the two-operator mode was 2250 plants/h,and 1542 plants/h in one-operator mode;comparing the artificial feeding productivity with auto grafting productivity,it was found that the capacity of the grafting robot was higher than the feeding speed of the one-operator mode but lower than that of the two-operator mode.

关键词： robotic productivity improvement simultaneous multi-plant grafting negative pressure feeding

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

An assessment of response of soil-based indicators to nitrogen fertilizer across four tropical eucalyptus plantations

引用

Journal of Forestry Research 2009年第3期20卷 237-242,286页

作者： D.S.Mendham S.Kumaraswamy K.V.Sankaran K.Smitha John T.S.Grove A.M.O’Connell S.J.Rance M.P.Sujatha CSIRO Sustainable Ecosystems Kerala Forest Research Institute

Low nitrogen (N) availability often results in reduced productivity of Eucalyptus plantations. We studied the response of four eucalyptus plantations (two plantations of E. tereticornis on the coastal lowlands, and two plantations of E. grandis in the upland region of the Western Ghats, Kerala, India) to N addition and related this response to seasonal N mineralization as well as other indices of N availability, in order to examine the utility of soil based indicators of N mineralization for predicting the response of eucalyptus growth to added N fertilizer. Several biochemical indicators were examined for their capacity to predict response to N fertilizer, including total soil N, soil C:N ratio, and N released during anaerobic and aerobic incubation. Results show that nitrogen fertilizer addition increased productivity across the 4 sites from 7% to 70%, N released during an aerobic incubation had the highest correlation with fertilizer response across the 4 sites (R2=0.92, p<0.01), and that Modelled seasonal soil N mineralisation was a poorer predictor of fertilizer response than N released during an aerobic incubation. Whilst some of these indicators are promising, they need wider validation and testing before they could be routinely applied.

关键词： nitrogen mineralization Eucalyptus grandis Eucalyptus tereticornis N fertilization site management productivity improvement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A Survey of the Use of the Discrete-event Simulation in Manufacturing Industry

引用

厦门大学学报（自然科学版） 2002年第S1期41卷 193-195页

作者： Arne Ingemansson Gunnar S Bolmsj Ulrika Harlin Department of Mechanical Engineering Lund UniversityDepartment of Mechanical Engineering Lund UniversityIVF Industrial Research and Development Corporation Mlndal SwedenSwedenSweden

In this work, a survey of companies has been produc ed from a questionnaire and in-depth inter-views. The aimof the paper is to give a current view of the use of DES (Discrete- Event Simulation) in the indust ry. The companies have been selected in a wide range in e.g. size, capital turno ver and employees. The survey was restricted to Sweden, although the results may be applicable to other countries with similar industrial structure. Some of the companies investigated are also multinational with branches around the world. T o illustrate the differences in production systems different sectors have be en investigated, e.g. the manufacturing industry and energy sector. The manufact uring systems generally differ in that the energy sector is more known for high reliability in their systems and the manufacturing sector tends to work more wit h lean production. Previous surveys of manufacturing efficiency illustrate different aspects. Accor ding to one survey, more than one-third (34%) of the disturbances in two countr ies (the U.S. and Finland) were mainly caused by design-based errors and flaws. The survey also showed the scope of safety problems experienced in the implemen tation and use of flexible manufacturing systems (Jrvinen et al., 1996). Another survey in Germany reports a gap between users and non-users of DES. Man y companies that are not familiar with simulation are not aware of its benefits. The study suggested integrating simulation into the planning processes as a reg ular tool. So far, DES is mostly used in system planning, resource planning and scheduling and production planning (Hirschberg & Heitmann, 1997). The disposition of the accomplished questionnaire had been multiple-choice ques tions in a strict order. The respondents gave their views on what the interviewe r considered relevant for the survey. The questionnaire was mailed to 220 person s in May 2001; a second round for unanswered surveys was dispatched in August 20 01. Replies came from 114 r

关键词： discrete-event simulation manufacturing systems disturbances productivity improvement

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

产业协同集聚下的城市生产效率增进*

引用

区域与城市经济 2016年第9期

作者：陈建军刘月邹苗苗

促进产业融合、实现融合创新的现实空间平台就是产业协同集聚。以产业协同集聚进行空间布局调整，从而实现城市生产效率增进，对新常态下促进发展动力由要素驱动、投资驱动向创新驱动的转变具有重要现实意义。产业协同集聚通过分工和技... 详细信息

促进产业融合、实现融合创新的现实空间平台就是产业协同集聚。以产业协同集聚进行空间布局调整，从而实现城市生产效率增进，对新常态下促进发展动力由要素驱动、投资驱动向创新驱动的转变具有重要现实意义。产业协同集聚通过分工和技术外部性可以产生创新，提高城市生产效率，是实现发展动力转换的重要途径。在运输成本和面对面接触需求的主导下，产业协同集聚与城市空间结构形成循环累积的因果关系并互相强化。空间计量的实证结果验证了产业协同集聚对城市生产效率的增进作用，周边城市效率提升也能带动本地效率增进。产业协同集聚的效率增进效应不仅存在地区差异，还具有行业异质性特征。受交易成本和面对面接触需求的影响，产业协同集聚对城市生产效率增进的空间外溢效应随距离增加而衰减，在300公里范围内的空间外溢效应最强，超过750公里后空间外溢效应明显下降。因此，以产业协同集聚进行空间布局调整是实现城市生产效率增进的现实选择，这不仅需要差别化和精细化指导，还需要突破行政区划限制进行协调。

关键词：产业协同集聚效率增进空间外溢融合创新发展动力转变产业结构 synergy and co-agglomeration of industries productivity improvement spatial spillover effect integrated innovation conversion of driving force for economic development industrial structure

来源：人大复印报刊资料评论

在线全文

人大复印报刊资料

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：