The stretching process,as a key phase of web production system,pursues the target velocities of rollers and the web tensions of spans between the successive rollers to guarantee proper stretching ratios. This requires...The stretching process,as a key phase of web production system,pursues the target velocities of rollers and the web tensions of spans between the successive rollers to guarantee proper stretching ratios. This requires the stable velocities and velocity ratios of large number rollers separated throughout the workshop. To this goal,a distributed cooperative controller is designed to coordinate the velocities of the rollers to the desired values as well as the target ratios between the upper and lower rollers. During the whole evolution,only the neighbor rollers can exchange the working information,and neither global information nor central controller is required. It is proven that all the rollers asymptotically achieve the desired velocity ratios via the proposed control law,which is also demonstrated by numerical simulation.展开更多
A new web product data management architecture is presented. The three-tier web architecture and Simple Object Access Protocol (SOAP) are combined to build the web-based product data management (PDM) system which incl...A new web product data management architecture is presented. The three-tier web architecture and Simple Object Access Protocol (SOAP) are combined to build the web-based product data management (PDM) system which includes three tiers: the user services tier, the business services tier, and the data services tier. The client service component uses the server-side technology, and Extensible Markup Language (XML) web service which uses SOAP as the communication protocol is chosen as the business service component. To illustrate how to build a web-based PDM system using the proposed architecture, a case PDM system which included three logical tires was built. To use the security and central management features of the database, a stored procedure was recommended in the data services tier. The business object was implemented as an XML web service so that client could use standard internet protocols to communicate with the business object from any platform. In order to satisfy users using all sorts of browser, the server-side technology and Microsoft ASP.NET was used to create the dynamic user interface.展开更多
近些年,对于微生物的研究越来越多地集中在微生物天然产物上,很少有研究人员对该领域文献作全面回顾分析。为探究国内外微生物天然产物领域的研究概况,以便为研究人员提供直观的参考,利用Citespace、VOSviewer软件对自1974年以来发表在W...近些年,对于微生物的研究越来越多地集中在微生物天然产物上,很少有研究人员对该领域文献作全面回顾分析。为探究国内外微生物天然产物领域的研究概况,以便为研究人员提供直观的参考,利用Citespace、VOSviewer软件对自1974年以来发表在Web of Science(核心数据库)和CNKI数据库的微生物天然产物领域的论文进行统计和文献计量分析。结果表明,自2012年起,微生物天然产物的相关研究进入高速发展阶段,发文总量呈快速增长趋势。根据布拉福德定律,该领域成果在期刊分布上较为分散。根据普莱斯定律,中英文文献核心作者分别为发文量不少于2篇、3篇的作者。从合作关系来看,欧洲国家间合作最为频繁,中国学者间形成明显聚类,且积极参与国际研究合作。从高频关键词突现和共现图可知,当前国内外在研究层次、策略、内容、热点方面各具特色。通过以上分析建议,国家、研究机构、科研人员之间应继续加强合作,在做好基础性研究的同时进一步加强应用型研究,以推动微生物天然产物领域的更快发展。展开更多
基金National Natural Science Foundations of China(Nos.61203073,61134009)Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20120075120008)+2 种基金Foundation of Key Laboratory of System Control and Information Processing,Ministry of Education,China(No.SCIP2012002)Program for Changjiang Scholars and Innovation Research Team in University from the Ministry of Education,China(No.IRT1220)Specialized Research Fund for Shanghai Leading Talents,Project of the Shanghai Committee of Science and Technology(No.13JC1407500)
文摘The stretching process,as a key phase of web production system,pursues the target velocities of rollers and the web tensions of spans between the successive rollers to guarantee proper stretching ratios. This requires the stable velocities and velocity ratios of large number rollers separated throughout the workshop. To this goal,a distributed cooperative controller is designed to coordinate the velocities of the rollers to the desired values as well as the target ratios between the upper and lower rollers. During the whole evolution,only the neighbor rollers can exchange the working information,and neither global information nor central controller is required. It is proven that all the rollers asymptotically achieve the desired velocity ratios via the proposed control law,which is also demonstrated by numerical simulation.
基金the National Key Project Foundation of China (No. 2001BA201A0605) and partially supported by the State Key Lab for Mechanical Transmission..
文摘A new web product data management architecture is presented. The three-tier web architecture and Simple Object Access Protocol (SOAP) are combined to build the web-based product data management (PDM) system which includes three tiers: the user services tier, the business services tier, and the data services tier. The client service component uses the server-side technology, and Extensible Markup Language (XML) web service which uses SOAP as the communication protocol is chosen as the business service component. To illustrate how to build a web-based PDM system using the proposed architecture, a case PDM system which included three logical tires was built. To use the security and central management features of the database, a stored procedure was recommended in the data services tier. The business object was implemented as an XML web service so that client could use standard internet protocols to communicate with the business object from any platform. In order to satisfy users using all sorts of browser, the server-side technology and Microsoft ASP.NET was used to create the dynamic user interface.
文摘近些年,对于微生物的研究越来越多地集中在微生物天然产物上,很少有研究人员对该领域文献作全面回顾分析。为探究国内外微生物天然产物领域的研究概况,以便为研究人员提供直观的参考,利用Citespace、VOSviewer软件对自1974年以来发表在Web of Science(核心数据库)和CNKI数据库的微生物天然产物领域的论文进行统计和文献计量分析。结果表明,自2012年起,微生物天然产物的相关研究进入高速发展阶段,发文总量呈快速增长趋势。根据布拉福德定律,该领域成果在期刊分布上较为分散。根据普莱斯定律,中英文文献核心作者分别为发文量不少于2篇、3篇的作者。从合作关系来看,欧洲国家间合作最为频繁,中国学者间形成明显聚类,且积极参与国际研究合作。从高频关键词突现和共现图可知,当前国内外在研究层次、策略、内容、热点方面各具特色。通过以上分析建议,国家、研究机构、科研人员之间应继续加强合作,在做好基础性研究的同时进一步加强应用型研究,以推动微生物天然产物领域的更快发展。
