基于柔性技术的财政预算报表系统设计

报表是用于信息传递的重要手段,本文针对报表的开发提出了一种基于“柔性”技术的报表设计的结构框架和实现方法,并根据财政预算报表的实际,提出了“柔性”报表的设计模式和一种高效的“平行”检索技术。     

云计算趋势对网络基础架构的影响

针对云计算的变革,文章分析云计算发展的几大趋势,阐述适应云计算的关键是要提供高弹性、高扩展性、易管理和开放的网络,并建议未来理想的云计算网络架构应是一个无阻塞、可自愈、即插即用的黑盒网络平台,它可持续演进,并能提供开放的网络业务。     

柔性超级电容器电极材料与器件研究进展

超级电容器,也称电化学电容器,它具有比锂离子电池更高的功率密度和更长的循环寿命,与此同时,其能量密度也高于传统的电介质电容器,因此成为了一类具有很大应用前景的能量储存设备。随着人们对智能电子设备性能要求的提高,各类柔性可穿戴电子设备相继出现,柔性超级电容器作为一类便携式能量储存设备也受到了许多研究者的关注。在持续的研究中,二维平面结构的柔性超级电容器得到较大发展并日益成熟,与此同时,随着对柔性电子设备可穿戴性能要求的提高,一维纤维结构的柔性超级电容器应运而生,并且得到了初步发展。本文首先介绍了超级电容器的储能原理和重要性能的评估方法;接着,重点概述了二维平面结构和一维纤维结构两类柔性超级电容器器件结构和电极材料的研究进展;最后,总结了两类柔性超级电容器仍然存在并亟待解决的问题以及未来发展所面临的关键技术挑战,期望能为柔性超级电容器的研究提供参考和借鉴。     

Electromechanical properties of graphene transparent conducting films for flexible electronics

We report a systematic study of the electromechanical properties of graphene films for flexible transparent conducting electrodes. The flexibility of graphene films, which were grown using a chemical vapor deposition (CVD) method and transfer process on polyethylene terephthalate (PET) substrates, was investigated using a lab-made inner/outer bending, twisting and stretching test system. The electromechanical properties as a function of the change of bending radius, twisting angle and strain distance were evaluated by measuring the change in resistance. The change in resistance during the inner bending test was less than 8% even when the bending radius was 3 mm. Additionally, the results of the inner bending fatigue test showed a constant resistance throughout 2000 bending cycles. However, in the outer bending test, the resistance increased substantially when the bending radius was smaller than 10 mm. Therefore, we can expect that more cracks form between the grains of graphene during the outer bending test. The twistability and stretchability of the graphene film were also investigated. Both twisting and stretching tests show gradually increasing resistances according to the twisting angle and stretching distance. These results provide useful information regarding the electromechanical properties of graphene transparent conducting films for the development of flexible electronics.     

The Vehicle Routing Problem with Demand Range

We propose and formulate the vehicle routing problem with demand range (VRPDR), a new variation on the traditional vehicle routing problem. In the VRPDR, the delivery quantity for each customer i is allowed to vary from its original size d _i by an amount α d _i where 0 ≤ α < 1. In adding this limited flexibility to the problem, there is potential to generate significant savings in the total distance traveled. We address issues such as bounding the impact of a given α on total distance and provide empirical results to illustrate “typical” behavior.