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Research progress of cholesteric liquid crystals with broadband reflection characteristics in application of intelligent optical modulation materials 被引量:1
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作者 张兰英 高延子 +9 位作者 宋平 武晓娟 苑晓 何宝凤 陈兴武 胡望 郭仁炜 丁杭军 肖久梅 杨槐 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第9期13-23,共11页
Cholesteric liquid crystals(CLCs) have recently sparked an enormous amount of interest in the development of soft matter materials due to their unique ability to self-organize into a helical supra-molecular architec... Cholesteric liquid crystals(CLCs) have recently sparked an enormous amount of interest in the development of soft matter materials due to their unique ability to self-organize into a helical supra-molecular architecture and their excellent selective reflection of light based on the Bragg relationship.Nowadays,by the virtue of building the self-organized nanostructures with pitch gradient or non-uniform pitch distribution,extensive work has already been performed to obtain CLC films with a broad reflection band.Based on authors' many years' research experience,this critical review systematically summarizes the physical and optical background of the CLCs with broadband reflection characteristics,methods to obtain broadband reflection of CLCs,as well as the application in the field of intelligent optical modulation materials.Combined with the research status and the advantages in the field,the important basic and applied scientific problems in the research direction are also introduced. 展开更多
关键词 cholesteric liquid crystals soft matter materials broadband reflection characteristics intelligent optical modulation materials
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Design of BLDCM Driving and Control System for Motorized Treadmill
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作者 Qi Zhang Hui Li Li-Bin Wang 《Journal of Electronic Science and Technology of China》 2007年第2期141-145,共5页
To satisfy the requirement of developing a new generation of motorized treadmill for a famous domestic manufacturer, a brushless DC motor (BLDCM) driving and control system for motorized treadmill is developed. High... To satisfy the requirement of developing a new generation of motorized treadmill for a famous domestic manufacturer, a brushless DC motor (BLDCM) driving and control system for motorized treadmill is developed. High integration and reliability of this system are ensured under the condition that intelligent power module (IPM) is used and the protection module is included. Periodic current control method is applied to reduce the average current flowing through the armature winding of the motor when the treadmill is required to start with low speed while large load is added. Piecewise proportion-integration-differentiation (PID) control algorithm is applied to solve the problem of speed fluctuation when impulse load is added. The motorized treadmill of a new generation with the driving and control system has the advantages of high reliability, good speed stability, wide timing scope, low cost, and long life-span. And it is very promising for practical applications. 展开更多
关键词 Brushless DC motor intelligent power module motorized treadmill periodic current control method.
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MODULE DEFINITION MODEL FOR MODULAR DESIGN AND MANUFACTU-RING OF HEAVY DUTY MACHINE TOOLS
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作者 HuWeigang LiChenggang +3 位作者 ZhongYifang YuJun ZhouJi LiuYuqi(Huazhong University of Science and Technology) 《Chinese Journal of Mechanical Engineering》 SCIE EI CAS CSCD 1995年第4期281-286,共17页
The key techniques of modular design of heavy duty NC mathine tools are described. Amodule definition modelfor modular design and manufacturing of heavy duty NC machine tools isbulit and the essential composition of t... The key techniques of modular design of heavy duty NC mathine tools are described. Amodule definition modelfor modular design and manufacturing of heavy duty NC machine tools isbulit and the essential composition of the module definition model (MDM) is discussed in detail. Itis composed of two models: the part definition model (PDM) and the module assembly model(MAM). The PDM and MAM are built and their structures are given. Using object-oriented know-ledge representation and based on these models, an intelligent support system of modular design forheavy duty NC machine tools is developed and implemented This system has been applied to thepractical use of Wuhan Heavy Duty Machine Tool Works 展开更多
关键词 Modular design Module definition model intelligent system NC machine tools
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