有机电致发光显示器交流驱动电路研究

提出并设计了一种有机电致发光显示器交流电压驱动电路,在验证此电路性能的同时也对有机电致发光显示器在交流驱动下的特性进行了测试。研究结果表明,交流驱动电路工作性能良好,在实现交流的同时抑制了交叉效应的产生,并能够大幅度地提高有机电致发光显示器的寿命。在对有机电致发光显示器交流驱动下的特性研究中发现:改变交流驱动的频率会影响发光像素点的性能,频率在50Hz左右的交流驱动是最适合有机电致发光显示器。     

Traffic Accidents and Convictions: Group Totals Versus Rate per Kilometer Driven

Using group totals, young drivers, male drivers, and especially young male drivers are substantially over-represented in terms of both traffic accidents and traffic-related convictions. On the other hand, when accidents and convictions are considered in terms of their rates while the person is actually driving, older drivers and female drivers gain in importance, with the female drivers' traffic accident rate and rates for some convictions exceeding the male drivers' rates. Similarly, the older drivers' accident rate and rates on some convictions exceeded the younger drivers' rates when considered in terms of driving exposure. In addition, these findings lead one to speculate that recent driving exposure more than driver age is the central factor in traffic accident involvement. The implications for policy makers and educators are clear. Although young male drivers are undeniably a legitimate focus for traffic accident countermeasures, they should not be targeted at the expense of drivers who drive less but have as high or higher accident rates—female and older drivers.     

基于单片机的出租车计费器设计

以单片机AT89C52为核心设计出租车自动计费器,附有复位电路,时钟电路,键盘电路等。通过按键模拟出租车的运行,暂停,停止,并在1602字符液晶上可以显示运行时间,运行时的暂停时间,最后通过计算可以得出总费用及总里程。     

实体有限元模拟预制节段桥墩循环荷载分析

采用实体有限单元法模拟无粘结预应力、普通箍筋约束预制拼装桥墩在循环荷载下的力学反应，得到其荷载位移滞回曲线。为了提高预制拼装桥墩的滞回性能，改进模型，使用贯穿节段接触面的普通纵向钢筋作为能量耗散装置增强耗能能力。改进后的模型残余变形小，滞回性能高。     

动态语境与语言交际

语言的使用离不开语境．由于受多种因素的制约和影响，语境并非静态的，而是相对的、动态的．文章从语言、交际过程的本质来分析和探讨相对语境存在的机制及相对语境的几种特殊表现形式，而能否识别动态语境决定着语用能力的高低．     

系统对应说与转化机制

夸克等人的系统对应说和张今的转化机制均属语法转换领域中的学说。这两个学说都不同程度地受到转换生成语法的影响 ,但它们不采用其理论系统 ,而是以一种非正式的方法来说明结构或句型之间的关系。本文旨在对二者进行比较研究 ,探讨其共性和差异     

A Bayesian approach to the statistical analysis of device preference studies

Drug delivery devices are required to have excellent technical specifications to deliver drugs accurately, and in addition, the devices should provide a satisfactory experience to patients because this can have a direct effect on drug compliance. To compare patients' experience with two devices, cross-over studies with patient-reported outcomes (PRO) as response variables are often used. Because of the strength of cross-over designs, each subject can directly compare the two devices by using the PRO variables, and variables indicating preference (preferring A, preferring B, or no preference) can be easily derived. Traditionally, methods based on frequentist statistics can be used to analyze such preference data, but there are some limitations for the frequentist methods. Recently, Bayesian methods are considered an acceptable method by the US Food and Drug Administration to design and analyze device studies. In this paper, we propose a Bayesian statistical method to analyze the data from preference trials. We demonstrate that the new Bayesian estimator enjoys some optimal properties versus the frequentist estimator.     

An Integrated Physical Dispersion and Behavioral Response Model for Risk Assessment of Radiological Dispersion Device (RDD) Events

A radiological dispersion device (RDD) or "dirty" bomb is a conventional explosive wrapped in radiological material. Terrorists may use an RDD to disperse radioactive material across a populated area, causing casualties and/or economic damage. Nearly all risk assessment models for RDDs make unrealistic assumptions about public behavior in their health assessments, including assumptions that the public would stand outside in a single location indefinitely. In this article, we describe an approach for assessing the risks of RDD events incorporating both physical dispersion and behavioral response variables. The general approach is tested using the City of Pittsburgh, Pennsylvania as a case study. Atmospheric models simulate an RDD attack and its likely fallout, while radiation exposure models assess fatal cancer risk. We model different geographical distributions of the population based on time of day. We evaluate aggregate health impacts for different public responses (i.e., sheltering-in-place, evacuating). We find that current RDD models in use can be improved with the integration of behavioral components. Using the results from the model, we show how risk varies across several behavioral and physical variables. We show that the best policy to recommend to the public depends on many different variables, such as the amount of trauma at ground zero, the capability of emergency responders to get trauma victims to local hospitals quickly and efficiently, how quickly evacuations can take place in the city, and the amount of shielding available for shelterers. Using a parametric analysis, we develop behaviorally realistic risk assessments, we identify variables that can affect an optimal risk reduction policy, and we find that decision making can be improved by evaluating the tradeoff between trauma and cancer fatalities for various RDD scenarios before they occur.     

浅议韩礼德的语域理论在精读教学中的运用

文章通过对美国经典幽默作家C a lv in T rillin名作《成功》的具体分析,探讨如何把韩礼德的语域理论运用于精读课中,从语体、语篇和修辞等角度,指导教和学两个方面。其目的在于找到一种好的教学方法,不仅能改变精读课耗时低效的局面,而且能加速学生语言知识向语言应用能力转化的进程,增强语言表达正确性和得体性的意识。     

冠醚在电子工业中的应用

1 冠醚在电子工业中的应用 国外已有专利报道,冠醚可用作电子器件的表面处理剂以除去Ns~+、K~+,可以改进电容器的性能,提高光电显示器件的使用寿命,制备特种气体等。这表明冠醚在电子工业方面的应用有着很大的潜力。下面介绍一些典型实例。