Display illumination with modulated directional backlight

Illumination is essential for modern life as colorful world is perceived by human visionary system. Display technology has been developing rapidly in recent decades, and the basic principle is related to the way that the image is illuminated and light is emanated. Traditional illumination is provided by different types of light sources, and the display image is visible in large viewing space until the emanating light decays to zero. This work proposes and demonstrates a novel illumination scheme for a display in which the displaying images are visible only in specific spatial regions. The directional backlight ensures the image propagating to specific direction while imaging visibility can be controlled to terminate abruptly at certain distance from the display screen while exerting no influence to nearby regions. The working principle for such an illumination scheme is the use of the modulated coherent directional backlight through an axicon lens. It is shown that the illumination scheme can robustly deliver carried image information to the designated viewing region. This new illumination scheme has many advantages over conventional illumination, including its usage for personal display, very lower energy consumption, as well as minimizing light hazard pollution.     

利用框架理论对信号进行重建

在Hilbert空间中讨论了框架的一些重要的性质,定义了一个框架算子,并讨论了该算子的性质。根据实际问题构造了一框架,使信号在此框架下的投影正好为非均匀采样值。给出了一种框架界的估计方法和重建原信号的迭代算法,最后,用仿真验证了此算法的有效性。     

188Re-HEDP注射液药物代谢动力学研究

将药物静脉注射到动物体内 ,以观察188Re -HEDP注射液在动物体内代谢动力学的特征。结果表明 ,滞留在荷瘤大鼠患骨中的放射性比在正常骨中的多 (P <0 .0 5 ) ;小鼠 72h内排泄放射性累积百分率约为 82 %(其中尿液排泄为 80 %) ;体外血浆蛋白结合率为 86 .4 %± 0 .30 %。说明该药物是亲骨药物 ,血清除快符合药物代谢动力学二室模型 ,大部分的药物以原形从肾排出。     

Analysis and design of combined distributed-feedback/Fabry-Perotstructures for surface-emitting semiconductor lasers

We propose combined distributed-feedback/Fabry-Perot (DFB/FP) structures for surface-emitting semiconductor lasers. The analysis is based on coupled-wave equations modified for surface-emitting lasers. The proposed structures, which exhibit enhanced resonance due to a matching between the gain and field distributions resulting in a reduced threshold compared with simple FP structures, are formed by placing the DFB structure between two DBR mirrors of an FP resonant cavity and introducing phase layers between the DFB region and the mirrors. It was found that the periodic-gain structures are a special case of the combined DFB/FP structures in which the index coupling effect is assumed to be negligible due to a small fill factor or a small refractive-index difference. The effect of complex (gain and index) coupling on the design and the threshold characteristics of the structures is clearly illustrated. Some important design considerations that were neglected in the previous papers are addressed     

论江西省农村饮水安全工程规划

本文通过参与江西省农村饮水安全工程规划的工作的实践经验，重点介绍了江西省农村饮水安全工程规划的一些工作方法和过程，并对其江西省农村饮水安全工程规划进行了总结。     

The influence of heat-treatment on the current-voltage behavior of the ZnO-Bi2O3 based varistors

The post-sintering heat treatment on the current-voltage behavior of the ZnO-Bi₂O₃ based varistors is reported. It is suggested that only phase transition of the Bi₂O₃ is not alone responsible for the resulting electrical performance by these devices. The ambient condition influences the performance parameters. Thus, incorporating the role of oxygen and zinc interstitial in the total device during the post-sintering heat-treatment is accounted as responsible parameters for the ultimate performance. Two recipes are used in demonstrating the effect of heat-treatment on the functional behavior of the devices.     

点阵汉字库到PROTEL元件符号图形库的转换

本文介绍了PROTEL元件符号图形库和点阵汉字库的结构,以及怎样将点阵汉字库转换到PROTEL元件符号图形库的方法。从而提出一种在利用PROTEL设计电路原理图时,加入汉字标注的途经。     

网络环境下精品课程教师信息技术能力培养研究

2003年4月教育部下发了《教育部关于启动高等学校教学质量与教学改革工程精品课程建设工作的通知》,要求全国高等学校启动教学质量与教学改革工程精品课程建设工作。广大教师积极参与其中,努力建设自己所教授的课程,力争成为精品课程。但是,在精品课建设当中,由于专业教师信息技术能力欠缺,使课程建设遇到了瓶颈。本文从分析精品课教师具备信息技术能力的必要性入手,指出精品课教师应该具备的信息技术能力,最后提出精品课教师在网络环境下提高信息技术能力的途径。     

热轧态Si—Mn系双相钢的组织转变

利用Ｇｌｅｅｂｌｅ－１５００热模拟试验机对试验钢进行了热模拟轧制。研究了在不同热轧工艺参数与合金化程度条件下Ｓｉ－Ｍｎ双相钢的组织转变。获得了估算热轧态Ｓｉ－Ｍｎ双相钢马氏体体积百分数和先共翁素体体积百分数的计算式。计算值与实测值相吻合，给出了ｆｍ－Ｔ－Ｖ和ｆＦｐ－Ｔ－Ｖ关系的三维图及相应的ｆＭ和ｆＦｐ等值线图。     

大段长高压电缆护层保护器暂态特性分析与参数优化设计

大段长高压电缆在运行时会产生过高的护层感应电压,这对电缆护层保护器的过电压防护特性提出了更高要求,因此需要针对大段长电缆护层保护器暂态特性进行分析研究。基于PSCAD仿真软件,建立了典型220 kV高压电缆线路仿真模型,得出了在短路过电压和雷击过电压情况下,高压电缆长度对护层感应电压暂态特性的影响。通过绝缘配合与能量保护相结合的方式,得到了保护器参数取值范围及电缆线路短路电流与长度的适配曲线,提出了护层保护器参数优化设计的具体方法,并进行了试验测试。测试结果表明:当电缆线路出现短路故障时,随着电缆长度的增加,护层感应电压先线性增长,随后在保护器残压阈值的限制作用下逐渐趋于"饱和"状态,现有保护器能量吸收能力难以满足大段长电缆需求;改进后的护层保护器能量吸收能力显著提升,20 k A短路电流时允许的电缆长度大幅提高,满足大段长高压电缆线路安全运行的要求。