基于Windows Phone7.5的柯尔克孜文输入法研究与实现

Windows Phone 7.5是一款最近推出的且非常有潜力的智能手机操作系统之一.本文首先分析了柯尔克孜文的文字特点、拼写特点和设计难点,应用自动选型规则解决了柯尔克孜文在Windows Phone 7.5中的输入方向问题和连接问题,解决了柯尔克孜文与中文、英文和数字的混屏显示问题,从而在Windows Phone 7.5中实现了柯尔克孜文输入法.     

A device to measure wheel slip to improve the fuel efficiency of off road vehicles

A hall sensor based simple technique was introduced to measure wheel slip and a microcontroller based embedded digital system was developed to display wheel slip data and warn the operator with audible and visible warnings if the optimum range is exceeds. Hall sensor slip measurement system was validated in controlled soil bin condition, tar macadam surface and actual field condition and compared with the commercial radar sensor. The developed system is simple in construction and can be mounted to any make and model of agricultural tractors by entering the appropriate rolling radius via the computer interface. Field trials were conducted to measure wheel slip and fuel consumption on farm use with and without activation of slip indicator; it was observed that, the amount of fuel saving during various agricultural operation was up 1.3 l/h.     

Defining donor and acceptor strength in conjugated copolymers

ABSTRACT

The progress in efficiency of organic photovoltaic devices is largely driven by the development of new donor–acceptor (D–A) copolymers. The number of possible D–A combinations escalates rapidly with the ever-increasing number of donor and acceptor units, and the design process often involves a trial-and-error approach. We here present a computationally efficient methodology for the prediction of optical and electronic properties of D–A copolymers based on density functional theory calculations of donor- and acceptor-only homopolymers. Ten donors and eight acceptors are studied, as well as all of their 80 D–A copolymer combinations, showing absorption energies of 1.3–2.3 eV, and absorption strengths varying by up to a factor of 2.5. Focus lies on exhibited trends in frontier orbital energies, optical band gaps, and absorption intensities, as well as their relation to the molecular structure. Based on the results, we define the concept of donor and acceptor strength, and calculate this quantity for all investigated units. The light-harvesting capabilities of the 80 D–A copolymers were also assessed. This gives a valuable theoretical guideline to the design of D–A copolymers with the potential to reduce the synthesis efforts in the development of new polymers.     

基于含POSS-dendrimer超强液晶凝胶的柔性可拉伸液晶光散射显示器

利用凝胶因子自组装可赋予凝胶网络形状、强度等的特性,设计制备了多面体齐聚倍半硅氧烷(POSS)核有机无机杂化dendrimer(POSS-G1-BOC)凝胶因子并将其引入到液晶客体分子中,获得了兼具力学性能与响应特性的超分子液晶凝胶.在系统研究该液晶凝胶的凝胶行为、响应特性、表面形貌、组装机理及力学性质的基础之上,制备了基于透明柔性可拉伸导电薄膜(PU/Ag NWs)的三明治结构液晶光散射显示器件.该器件在低电压(10 V,DC)驱动下即可实现较高对比度的显示效果,不仅可以在弯曲至曲率为0.14 cm-1的条件下使用,而且在拉伸至原始长度的120%时,仍可保持自身的电控响应特性,有望将其广泛应用于可穿戴设备、智能响应性材料等领域.     

Constrained order in frustrated 2D optical patterns

In 2D optical patterns obtained in a Liquid Crystal Light Valve with optical feedback, we show a new kind of geometrical frustration which comes from the imposed form of the boundaries. The circular section of the incoming laser beam presents a symmetry which belongs to the O(2) group, whereas the optical feedback selects patterns with a symmetry restrained to a dihedral subgroup of O(2). By imposing boundaries which respect the symmetry of the dihedral group, we lift the frustration and obtain perfectly ordered patterns. Received 19 January 2001 and Received in final form 2 June 2001     

胶体量子阱发光二极管的研究进展

胶体量子阱(CQW)由于具有高色纯度、高光致发光量子效率、光色可调等优异的光电性能，近年来成为一种新型的光电材料，广泛用于制备发光二极管、激光、探测器、太阳能电池等半导体器件。其中，基于CQW的发光二极管(CQW-LED)因为具备极窄的光谱、极佳的色纯度、高效率、可溶液加工、可柔性化等优点，在显示和照明等领域展现出重要应用前景，受到学术界和工业界的广泛重视而成为研究热点。本文首先介绍了CQW-LED中的一些基本概念，包括CQW材料特性、LED器件结构、发光机理等；然后从CQW材料种类的角度出发，阐述了基于单核型、核/冠型、核/壳型、复杂异质结型、以及杂质掺杂型CQW-LED近年来的研究进展，并结合我们研究团队最近的工作详细的介绍了实现高性能CQW-LED的方法，包括对材料选取、设计策略、器件结构、器件性能、工作机理以及发光过程的分析；接着，介绍了CQW-LED的集成应用；最后探讨了CQW-LED目前面临的挑战及其未来的发展机遇。     

制造网络中信息系统能力对中小企业间知识共享的影响研究

针对制造网络,从能力视角,研究信息系统集成能力、业务覆盖能力、区域连接能力、人力资源能力和信息系统支持的无形资产能力对中小企业间知识共享的影响.对河北省和天津市近10家具有"电子合作"特征的中小制造企业进行调研,收回有效问卷163份,采用SPSS12.0进行数据分析.结果显示:信息系统集成能力对企业间知识共享的影响程度最大,其次是区域连接能力,再次是人力资源能力,而无形资产能力和业务覆盖能力对企业间知识共享没有显著影响.为管理者构建面向企业间知识共享的信息系统提供参考.     

Fabrication of a controllable anti-peeping device with a laminated structure of microlouver and polymer dispersed liquid crystals film

ABSTRACT

Display devices with the narrow viewing angle (NVA) and the wide viewing angle (WVA) characteristics can simultaneously meet the demands for privacy protection and information sharing. Herein, we propose a novel method for fabricating a controllable anti-peeping device with a laminated structure of microlouver and polymer dispersed liquid crystals (PDLCs) film, and this device can be reversibly switched between a wider viewing angle range (VAR) for the WVA mode and a narrower viewing angle range (VAR) for the NVA mode at 0 V and 8 V, respectively. Also, the VARs of the controllable anti-peeping device can be dynamically tuned by varying dimensions of the microlouver structures and applying various voltages across the PDLCs film from 0 V to 8 V. The as-fabricated device provides display devices with controllable viewing angle characteristics, which can be applied in the display field with fascinating and practical functions.     

亚像素采样对LED显示质量的提升

清晰显示高分辨率画面是LED显示屏图像质量提升领域中亟待解决的关键问题之一.针对LED显示屏分辨率低、成本高、像素排布灵活的特点,研究了亚像素采样技术在LED显示屏中的应用.从信号处理的角度,在RGB颜色空间中对LED显示屏建立了全像素采样和亚像素采样数学模型,在亮度与色度相分离的空间中对两种采样方式进行了频谱分析,证明了应用亚像素采样技术可以将显示系统的亮度混叠转移到了人眼较不敏感的颜色通道上,有效扩展了LED显示系统在各方向上的Nyquist频率限制.物理屏体上的仿真实验表明亚像素采样对LED显示屏的图像显示质量具有改善作用.