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
沉香是我国传统名贵南药,广泛应用于医药、香水、香料、宗教等方面,现已形成了工业、文化产业和农业三大类产业,市场价值极高。本研究在中国知网、维普网和万方数据库中以“沉香结香”为主题词检索,导出1978—2022年发表的文章,利用Cite...沉香是我国传统名贵南药,广泛应用于医药、香水、香料、宗教等方面,现已形成了工业、文化产业和农业三大类产业,市场价值极高。本研究在中国知网、维普网和万方数据库中以“沉香结香”为主题词检索,导出1978—2022年发表的文章,利用CiteSpace软件进行可视化分析;在Web of Science以“agarwood production method”为检索词,可视化分析1978—2022年发表的外文文献。结果表明,国内沉香结香的研究一共分为3个阶段,1978—2007年为萌芽阶段,仅有零星文章产出;2008—2017年为快速发展阶段,大量文章产出并在2017年达到顶峰(41篇);2018—2022年为稳定阶段,持续产出文章并维持在年均20篇以上;有关沉香结香机理的研究发文量前10的期刊中,90%等级均在科技核心以上,排在前10的研究结构均处于沉香产业发达地区。国外沉香结香的研究起源于2008年,整体发文量趋势逐年增加;被引量前10的期刊均为SCI;研究量前10的国家均为GDP前列的国家。有关沉香自然结香和人工结香差异分析的研究成为当前研究热点,未来如何利用2种不同沉香结香方式的成分差异发展沉香资源,将会是新的研究趋势。本研究结果将为科研人员研究提供进一步参考方向,也为生产种植者提供沉香结香参考。展开更多
Irrigation water management has significant economic implications in developing countries like Malaysia. As in many countries, Malaysia is also espousing internet as a platform of new possibilities for information acc...Irrigation water management has significant economic implications in developing countries like Malaysia. As in many countries, Malaysia is also espousing internet as a platform of new possibilities for information access and sharing. Thus web based decision tools are pertinent in managing water, which is becoming a source of conflict between domestic, industry and agricultural use in this emerging technological and information age. Decision Support System （DSS） created in the past was theoretically acceptable but practically not effective in the transfer of scientific knowledge from research labs to the end-users to support them in decision making. The Web Based Paddy Irrigation Productivity Assessment （WebPIPA） is an example of DSS created to provide an effective conduit for the transfer of scientific knowledge from research labs to the end-users to support them in decision making. WebPIPA serves as an innovative, user friendly and efficient management tool for run-of-river rice irrigation system. It is a web based program that requires users to login through user name and password WebPIPA is developed using Net framework and ASP. Net Programming Languages of Microsoft. Net 2003 environment. A 3-tier architecture framework was carefully studied and was implemented to create the WebP1PA model. Mathematical model developed for aiding irrigation decisions must be oriented towards addressing various issues in addition to the scientific ones for better acceptability. All government and private agencies, researchers, station users, farmers, investors and buyers related to this study area will be able to access and share the database through the internet. By strengthening the involvement of government departments, the database can be very effectively used by all stakeholders at the same time narrowing the gap between the urban and rural communities in the development of country.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.
文摘沉香是我国传统名贵南药,广泛应用于医药、香水、香料、宗教等方面,现已形成了工业、文化产业和农业三大类产业,市场价值极高。本研究在中国知网、维普网和万方数据库中以“沉香结香”为主题词检索,导出1978—2022年发表的文章,利用CiteSpace软件进行可视化分析;在Web of Science以“agarwood production method”为检索词,可视化分析1978—2022年发表的外文文献。结果表明,国内沉香结香的研究一共分为3个阶段,1978—2007年为萌芽阶段,仅有零星文章产出;2008—2017年为快速发展阶段,大量文章产出并在2017年达到顶峰(41篇);2018—2022年为稳定阶段,持续产出文章并维持在年均20篇以上;有关沉香结香机理的研究发文量前10的期刊中,90%等级均在科技核心以上,排在前10的研究结构均处于沉香产业发达地区。国外沉香结香的研究起源于2008年,整体发文量趋势逐年增加;被引量前10的期刊均为SCI;研究量前10的国家均为GDP前列的国家。有关沉香自然结香和人工结香差异分析的研究成为当前研究热点,未来如何利用2种不同沉香结香方式的成分差异发展沉香资源,将会是新的研究趋势。本研究结果将为科研人员研究提供进一步参考方向,也为生产种植者提供沉香结香参考。
文摘Irrigation water management has significant economic implications in developing countries like Malaysia. As in many countries, Malaysia is also espousing internet as a platform of new possibilities for information access and sharing. Thus web based decision tools are pertinent in managing water, which is becoming a source of conflict between domestic, industry and agricultural use in this emerging technological and information age. Decision Support System （DSS） created in the past was theoretically acceptable but practically not effective in the transfer of scientific knowledge from research labs to the end-users to support them in decision making. The Web Based Paddy Irrigation Productivity Assessment （WebPIPA） is an example of DSS created to provide an effective conduit for the transfer of scientific knowledge from research labs to the end-users to support them in decision making. WebPIPA serves as an innovative, user friendly and efficient management tool for run-of-river rice irrigation system. It is a web based program that requires users to login through user name and password WebPIPA is developed using Net framework and ASP. Net Programming Languages of Microsoft. Net 2003 environment. A 3-tier architecture framework was carefully studied and was implemented to create the WebP1PA model. Mathematical model developed for aiding irrigation decisions must be oriented towards addressing various issues in addition to the scientific ones for better acceptability. All government and private agencies, researchers, station users, farmers, investors and buyers related to this study area will be able to access and share the database through the internet. By strengthening the involvement of government departments, the database can be very effectively used by all stakeholders at the same time narrowing the gap between the urban and rural communities in the development of country.
