By combining the Back-Propagation （BP） neural network with conventional proportional Integral Derivative （PID） controller, a new temperature control strategy of the export steam in supercritical electric power pla...By combining the Back-Propagation （BP） neural network with conventional proportional Integral Derivative （PID） controller, a new temperature control strategy of the export steam in supercritical electric power plant is put forward. This scheme can effectively overcome the large time delay, inertia of the export steam and the influencee of object in varying operational parameters. Thus excellent control quality is obtaitud. The present paper describes the development and application of neural network based controller to control the temperature of the boiler＇s export steam. Through simulation in various situations, it validates that the control quality of this control system is apparently superior to the conventional PID control system.展开更多
The wave of the socialist market economy has continually invaded,which has already caused a serious impact on the survival of many enterprises in China at this stage.In order to obtain development,traditional enterpri...The wave of the socialist market economy has continually invaded,which has already caused a serious impact on the survival of many enterprises in China at this stage.In order to obtain development,traditional enterprises must follow the trend of the times to carry out their own reform and progress.For many high-tech enterprises,the most important issue is how to achieve internal control management,with rationalization means to gradually promote the corresponding work and economic benefits of enterprises,not only to save time,but also to improve the corresponding work efficiency,moreover,it is necessary to be able to promote the establishment of a relatively complete internal control management system in the actual work process of high-tech enterprises,in order to solve and prevent some problems that have emerged or need to be emerged.展开更多
在美国不断运用技术出口管制、单边制裁、“长臂管辖”等工具和手段,全方位遏制中国科技发展的背景下,分析美国战略与国际研究中心(Center for Strategic and International Studies,CSIS)围绕优化关键与新兴技术出口管制的主要观点和...在美国不断运用技术出口管制、单边制裁、“长臂管辖”等工具和手段,全方位遏制中国科技发展的背景下,分析美国战略与国际研究中心(Center for Strategic and International Studies,CSIS)围绕优化关键与新兴技术出口管制的主要观点和政策建议,既能为研判美国技术出口管制的发展走向提供依据,也能为中国应对高科技领域全方位遏制提供启示。通过文献调研与分析,梳理归纳CSIS关于优化关键和新兴技术的主要观点和建议。结果表明,美国将中国作为重要竞争对手,出口管制包括实体清单、国家清单、外国直接产品规则、全面控制等多个相互配合、补充的政策工具,可能通过优化出口管制政策、修改美国商务部工业和安全局清单、建立多边出口管制制度来确保半导体、量子技术、生物技术、人工智能等关键和新兴技术的竞争优势。最后,提出加强自主创新、监测预警、国际合作等的启示,以应对美国关键和新兴技术出口管制的可能影响。展开更多
The moisture control of materials in silk reeling technology of tobacco is regarded as the key factor influencing the inner quality of cigarette. In this paper, according to the statistical data of the silk reeling pr...The moisture control of materials in silk reeling technology of tobacco is regarded as the key factor influencing the inner quality of cigarette. In this paper, according to the statistical data of the silk reeling production line of Yunyan (Ruanzhen brand) of Qujing cigarette factory from June 2013 to May 2014, it is feasible to apply the random forest regression model to study the problem of moisture control theoretically. In the perfuming stage of silk reeling, a random forest regression model is established to describe the change of moisture content of finished cut tobacco in the export link of perfuming stage, aroused by several factors including incoming water content and different environment. According to the model, good moisture control in the export link of perfuming stage (accordance with the technological standards) can be realized by adjusting the regulating reference value of incoming moisture under specific workshop environments. In the drying stage of silk reeling, the most effective method of moisture control is to adjust the cylinder wall temperature by means of analyzing the correlation coefficients among variables which influence the moisture content of cut tobacco in the export link of drying stage and then establishing another random forest regression model. And this method is consistent with the traditional production experiences. In conclusion, these methods referred above provide strong theoretical basis for stable moisture control in the export link of perfuming stage.展开更多
To fully understand occurrence and damage status of pests and diseases in export blueberry,systematic survey was conducted in Majiang export blueberry bases in Guizhou Province from 2012 to 2015. A total of 21 kinds o...To fully understand occurrence and damage status of pests and diseases in export blueberry,systematic survey was conducted in Majiang export blueberry bases in Guizhou Province from 2012 to 2015. A total of 21 kinds of pests and diseases were found on blueberry,including 10 kinds of diseases and 11 kinds of pests. Comprehensive analysis of pests and diseases and their damage degree revealed that pests and diseases causing severe damage were gray mold,scarab and fruit fly,while gray mold and fruit fly might seriously affect the export of blueberry. The prevention and control measures against gray mold and fruit fly were summarized.展开更多
基金supported by the project of "SDUST Qunxing Program"(No.qx0902075)
文摘By combining the Back-Propagation （BP） neural network with conventional proportional Integral Derivative （PID） controller, a new temperature control strategy of the export steam in supercritical electric power plant is put forward. This scheme can effectively overcome the large time delay, inertia of the export steam and the influencee of object in varying operational parameters. Thus excellent control quality is obtaitud. The present paper describes the development and application of neural network based controller to control the temperature of the boiler＇s export steam. Through simulation in various situations, it validates that the control quality of this control system is apparently superior to the conventional PID control system.
文摘The wave of the socialist market economy has continually invaded,which has already caused a serious impact on the survival of many enterprises in China at this stage.In order to obtain development,traditional enterprises must follow the trend of the times to carry out their own reform and progress.For many high-tech enterprises,the most important issue is how to achieve internal control management,with rationalization means to gradually promote the corresponding work and economic benefits of enterprises,not only to save time,but also to improve the corresponding work efficiency,moreover,it is necessary to be able to promote the establishment of a relatively complete internal control management system in the actual work process of high-tech enterprises,in order to solve and prevent some problems that have emerged or need to be emerged.
文摘在美国不断运用技术出口管制、单边制裁、“长臂管辖”等工具和手段,全方位遏制中国科技发展的背景下,分析美国战略与国际研究中心(Center for Strategic and International Studies,CSIS)围绕优化关键与新兴技术出口管制的主要观点和政策建议,既能为研判美国技术出口管制的发展走向提供依据,也能为中国应对高科技领域全方位遏制提供启示。通过文献调研与分析,梳理归纳CSIS关于优化关键和新兴技术的主要观点和建议。结果表明,美国将中国作为重要竞争对手,出口管制包括实体清单、国家清单、外国直接产品规则、全面控制等多个相互配合、补充的政策工具,可能通过优化出口管制政策、修改美国商务部工业和安全局清单、建立多边出口管制制度来确保半导体、量子技术、生物技术、人工智能等关键和新兴技术的竞争优势。最后,提出加强自主创新、监测预警、国际合作等的启示,以应对美国关键和新兴技术出口管制的可能影响。
文摘The moisture control of materials in silk reeling technology of tobacco is regarded as the key factor influencing the inner quality of cigarette. In this paper, according to the statistical data of the silk reeling production line of Yunyan (Ruanzhen brand) of Qujing cigarette factory from June 2013 to May 2014, it is feasible to apply the random forest regression model to study the problem of moisture control theoretically. In the perfuming stage of silk reeling, a random forest regression model is established to describe the change of moisture content of finished cut tobacco in the export link of perfuming stage, aroused by several factors including incoming water content and different environment. According to the model, good moisture control in the export link of perfuming stage (accordance with the technological standards) can be realized by adjusting the regulating reference value of incoming moisture under specific workshop environments. In the drying stage of silk reeling, the most effective method of moisture control is to adjust the cylinder wall temperature by means of analyzing the correlation coefficients among variables which influence the moisture content of cut tobacco in the export link of drying stage and then establishing another random forest regression model. And this method is consistent with the traditional production experiences. In conclusion, these methods referred above provide strong theoretical basis for stable moisture control in the export link of perfuming stage.
基金Supported by Research Project of General Administration of Quality Supervision,Inspection and Quarantine(2016Ik065)Prefecture-County Science and Technology Cooperation Project of Guizhou Province"Research and Demonstration of Key Technology for Prevention and Control against Major Pests and Diseases in Organic Blueberry in Majiang County"
文摘To fully understand occurrence and damage status of pests and diseases in export blueberry,systematic survey was conducted in Majiang export blueberry bases in Guizhou Province from 2012 to 2015. A total of 21 kinds of pests and diseases were found on blueberry,including 10 kinds of diseases and 11 kinds of pests. Comprehensive analysis of pests and diseases and their damage degree revealed that pests and diseases causing severe damage were gray mold,scarab and fruit fly,while gray mold and fruit fly might seriously affect the export of blueberry. The prevention and control measures against gray mold and fruit fly were summarized.
