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Fluid-based Slotting Optimization for Automated Order Picking System with Multiple dispenser Types

Chinese Journal of Mechanical Engineering 2011年第4期24卷 529-538页

作者： LIU Peng WU Yaohua ZHOU Chen XU Na School of Control Science andEngineering Shandong University Jinan 250061 China School of Industrial and Systems Engineering Georgia Institute of Technology Atlanta GA 30332 USA Business School Shandong Jianzhu University Jinan 250101 China

Slotting strategy heavily influences the throughput and operational cost of automated order picking system with multiple dispenser types, which is called the complex automated order picking system （CAOPS）. Existing research either focuses on one aspect of the slotting optimization problem or only considers one part of CAOPS, such as the Low-volume dispensers, to develop corresponding slotting strategies. In order to provide a comprehensive and systemic approach, a fluid-based slotting strategy is proposed in this paper. The configuration of CAOPS is presented with specific reference to its fast-picking and restocking subsystems. Based on extended fluid model, a nonlinear mathematical programming model is developed to determine the optimal volume allotted to each stock keeping unit （SKU） in a certain mode by minimize the restocking cost of that mode. Conclusion from the allocation model is specified for the storage modules of high-volume dispensers and low-volume dispensers. Optimal allocation of storage resources in the fast-picking area of CAOPS is then discussed with the aim of identifying the optimal space of each picking mode. The SKU assignment problem referring to the total restocking cost of CAOPS is analyzed and a greedy heuristic with low time complexity is developed according to the characteristics of CAOPS. Real life application from the tobacco industry is presented in order to exemplify the proposed slotting strategy and assess the effectiveness of the developed methodology. Entry-item-quantity （EIQ） based experiential solutions and proposed-model-based near-optimal solutions are compared. The comparison results show that the proposed strategy generates a savings of over 18% referring to the total restocking cost over one-year period. The strategy proposed in this paper, which can handle the multiple dispenser types, provides a practical quantitative slotting method for CAOPS and can help picking-system-designers make slotting decisions efficiently and

关键词： slotting complex automated order picking system restocking cost dispenser

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RCS Reduction of Airborne dispenser

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Journal of Beijing Institute of Technology 2004年第S1期13卷 58-62页

作者：郝璐吴甲生 School of Mechatronics Engineering Beijing Institute of Technology Beijing 100081 China

The radar cross section (RCS) of dispenser and its components is computed by graphical electromagnetic computing (GRECO) method, which bases on physical optics (PO) method. A satisfied agreement is gotten between computed and measured results outdoor. The results show that the main scattering source of the dispenser is the mirror reflecting of the body; in the most crucial nose-on region, the nose mirror reflecting plays important role; the corner reflecting is important to the fins' RCS. The corresponding measures to reduce dispenser's RCS are proposed. It is indicated that to reduce RCS, shaping should be adopts first, while aerodynamic characteristics and stealth characteristics should be considered synthetically during the design of dispenser.

关键词： dispenser radar cross section (RCS) physical optics method (PO) outdoor RCS test graphical electromagnetic computing (GRECO)

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A NEW Ba-W dispenser CATHODE IMPREGNATED WITH BARIUM YTTERBATE

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Journal of Electronics(China) 1989年第2期6卷 189-193页

作者：王永树王奇李美仙邓耀德 Institute of Electronics Academia SinicaBeijing

A new kind of Ba-W dispenser cathode impregnated with barium ytterbate has been *** has good properties;high coefficient of secondary emission,strong ability of resisting oxygenpoisoning,high thermionic emission current density and more uniform emission on the cathode *** cathode is suitable for using as an electron emitter for microwave tubes,especially magnetrons.

关键词： Thermionic cathode Ba-W dispenser cathode Barium ytterbate Ba-W dispenser cathode

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Development of non-shrinkable ceramic composites for use in high-power microwave tubes

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International Journal of Minerals,Metallurgy and Materials 2019年第4期26卷 516-522页

作者： N.Dandapat S.Ghosh Bioceramics and Coating Division CSIR-Central Glass and Ceramic Research Institute

Al_2O_3–CaO–SiC-based ceramic composites with four different compositions were sintered at 1700℃ for 3 h in an air furnace. The phase analysis, microstructural characterization, and elemental composition determination of the developed composites were performed by X-ray diffraction(XRD), field-emission scanning electron microscopy(FESEM), and energy-dispersive X-ray(EDAX) analysis, respectively. The shrinkage, thermal properties, and electrical resistivity of the composites were also studied. The experimental results showed the effects of adding silicon carbide and calcia to alumina on the thermal, electrical, and shrinkage properties of the resultant composites. Among the four investigated ceramic composites, the one composed of 99 wt% alumina, 0.5 wt% CaO, and 0.5 wt% SiC exhibited the best characteristics for use as a potting material in a dispenser cathode of a microwave tube. The material exhibited slight expansion instead of shrinkage during drying or firing. Other properties of the composite powder, such as its thermal properties and electrical resistivity, were comparable to those of a commercial alumina powder.

关键词： Al2O3-CaO-SiC composite expansion potting material dispenser cathode microwave tube

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量子纠缠实验中激光线宽测量与磁光阱系统研制

量子纠缠实验中激光线宽测量与磁光阱系统研制

引用

作者：周武北京大学

学位级别：硕士

本文的目的是要建立一套用于量子纠缠实验研究的Rb磁光阱系统。首先,本文从理论和实验上研究了实验用半导体激光器的线宽及其测量方法,研究结果已经发表在物理快报A (Physics Letters A)上[1]。其次,本文全面描述了Rb磁光阱的理论和实... 详细信息

本文的目的是要建立一套用于量子纠缠实验研究的Rb磁光阱系统。首先,本文从理论和实验上研究了实验用半导体激光器的线宽及其测量方法,研究结果已经发表在物理快报A (Physics Letters A)上[1]。其次,本文全面描述了Rb磁光阱的理论和实验,并在此基础上进一步讨论了基于冷原子实验系统实现量子纠缠的可能性。从理论上详细推导了激光冷却和原子囚禁的基本理论公式,分析和总结了中性原子的磁场囚禁技术。实验装置上,设计和实现了超高真空系统,使得用于囚禁中性Rb原子的真空汽室达到2×10mbar的真空度。建立了激光冷却和囚禁原子用的激光系统和磁场系统。其中包括780nm半导体激光器的线上和线外稳频技术,以及冷却光和反抽运光的频率控制技术。在原子释放机制方面,使用全新的dispenser技术,旨在达到更高的真空度和更精确原子数的控制。探测系统采用CCD相机进行方便快捷的探测、监视。在本文最后部分,介绍了国际最新的研究方向――单原子囚禁原理和技术以及量子纠缠的产生、检测和演化实验。

关键词：量子纠缠激光频率谱功率谱函数激光冷却磁光阱 dispenser CCD成像

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