一种远程LED显示控制

随着单片机的应用日益广泛，单片机的使用技术变得越来越重要。本文讨论利用单片机的I／O技术实现LED的显示及利用它的通讯功能实现远程控制，从原理到实现方法等各方面进行阐述，便于读者了解使用单片机及微机解决实际问题。     

论医学数学化的基本途径

现代医学要上两个水平:分子水平与数学化水平。后者将开辟医学体系理论结构的新前景,使医学从实验与经验的范畴迈向严密的科学范畴。 应用模糊数学可以定义疾病集、症状集与疾病集的模糊关系,通过模糊推理、病理数量分析与模式识别可以作医疗诊断决策,从探讨专家系统、电脑问诊系统以及现代医疗器械的数学机制等,可以提高科研与诊断的理论水平,加强医学自身的运行机制,促进医学现代化。     

优势搭建:学校场域中的资本获取

置身于学校场域多元复杂的关系网络之中,每个人几乎都在为资本的获取搭建优势。但这种优势搭建的过程具有某种不固定性和不确定性,公开优势的获取可能带来并非优势的潜在尴尬,为人羡慕的强势群体同样有转为弱势群体的可能。     

解决西部地区信息资源匮乏的对策

西部地区受经济不发达等因素的制约,与发达地区的信息资源建设存在着较大差距,着手解决西部地区信息资源滞后的现象已迫在眉睫.为此,作者从加强政府调节力度、引进资金、发展自身潜力、优化信息资源配置和资源共建共享等方面,提出了解决西部地区信息资源匮乏的对策.     

解决西部地区“信息资源匮乏”的对策

西部地区受经济不发达等因素的制约 ,与发达地区的信息资源建设存在着较大差距 ,着手解决西部地区信息资源滞后的现象已迫在眉睫。为此 ,作者从加强政府调节力度、引进资金、发展自身潜力、优化信息资源配置和资源共建共享等方面 ,提出了解决西部地区“信息资源匮乏”的对策。     

中国老年人心脏形态与功能的多普勒超声心动图研究

本文以多普勒超声心动图对50例健康中国老年人的心脏形态与功能进行了研究,发现主动脉根部增宽、左房增大、右心室增大为心脏老化之形态特征,而静息状态心脏收缩功能在正常范围,但舒张功能却较差(E/A均值0.97).     

A QUESTION OF TIMING: WHEN IS THE BEST TIME TO SURVEY GRADUATES TO OBTAIN FEEDBACK ABOUT AN EDUCATIONAL PROGRAM?

When follow‐up surveys of graduates of Health Professional programs are used to obtain evaluative information about program components and processes, the timing of such a survey is an important consideration. Information may be collected at various points in time: at program end while the graduates are still on the premises, or at varying points after the graduates leave the educational institution. Follow‐up surveys of four classes of medical students and five classes of nursing students conducted at varying points in time are used to examine the effect of timing on the program feedback obtained. Graduate assessment of program features was consistent and stable even several years after program completion. Surveying students regarding their perceptions of their education shortly before graduation is recommended. This is less costly and provides information to program planners when it can have more immediate impact on program planning.     

CHANGING CHILDREN'S PERCEPTIONS OF THE ELDERLY

Many children have negative attitudes about older persons. This study used a pre‐posttest control group experimental design to investigate the effects of a guidance unit about older persons upon elementary school children in two schools. Significant results are reported. The experimental unit also proved effective for both boys and girls. Perceptions of children about the aging process and the elderly can be positively changed.     

论邓小平在接班人问题上所做的历史性贡献

笔者提出评判历史性贡献的三个标准及邓小平的第三项历史性贡献：选择并选举了我党合适的接班人;创立并起始了有中国特色的“领导核心交接制”。从学术角度对这项历史性贡献进行阐述,有助于从不同角度全面理解邓小平理论。笔者对社会主义科学体系中接班人理论与其他社会主义国家接班人问题的研究提出了新观点。     

DOS版本的选用

本文对各种DOS版本的主要功能差异作了简介,就如何选用DOS版本,才能充分利用计算机的硬件资源提出了作者的见解。     

THE EFFECTS OF CURRICULUM ON PRESCHOOL CHILDREN'S PERCEPTIONS OF THE ELDERLY

Perceptions of the elderly were determined for 42 4‐ and 5‐year‐old children. The Social Attitude Scale of Ageist Prejudice (SASAP) was used to examine how these young children perceived elderly people after being exposed to a developmentally appropriate classroom curriculum that focused on the characteristics and positive aspects of the elderly. In a pretest‐posttest design, a decrease in prejudice score was found for children in the experimental group from pretest to posttest; an increase in prejudice score was determined for the control group. Results of this study also indicate that young children are more negative toward elderly persons’ abilities than toward their social characteristics and that level of grandparent visitation is unrelated to SASAP score.     

盐桥的作用与选择

盐桥在化学实验中是极为简单的仪器,但在原电池中却是重要的部分。因为盐桥可使原电池两极形成导电回路,更重要的是用于消除液体接界电位。盐桥的选择实质上是盐桥中电解质的选择,对于水溶性电解质只要阴、阳离子的迁移速度近似相等,且不与电池中的电解质发生反应都可选作盐桥的电解质。