实验教学中虚拟实验实现技术的探讨

近年来,随着虚拟实验在教学中的应用越来越广泛,虚拟实验已经成为用现代教育技术来辅助教学的重要手段。该文通过实例来说明几种典型实现教学虚拟实验的技术,并对每种技术的优缺点以及适用性做出分析和说明。     

用Packet Tracer模拟软件提高《网络互联技术》实验教学效果

实验教学是高职计算机网络课程的重要组成部分,目前高职计算机网络实验课程开展困难,效果不明显。该文结合当前高职计算机网络课程实验教学的现状,谈一谈如何利用Packet Tracer模拟软件提高《网络互联技术》课程的实验教学效果。     

基于多线程和消息的局域网通信程序实现

目前大多数的局域网通信程序工作在服务器/客户机模式下.在此模式下的应用程序工作过程相对复杂且消耗资源较多.介绍了一种基于多线程技术和Windows消息机制的局域网通信程序的实现过程,使得两台网内主机可以在对等模式而不是传统的服务器/客户机模式下进行数据传输,从而简化了常见局域网通信程序编制中较为复杂的工作过程,实现了一种相对便捷的网络数据传输方式.     

无装饰特征探析

"无装饰"风格源自20世纪60年代的建筑行业的功能主义设计思潮。然而,现代的"无装饰"的风格并不是排斥或摈弃装饰,而是将装饰之"道"融入装饰之"器"。本文探讨无装饰自身的特征,使装饰的外延扩展。     

基于PIC16F873单片机的水产养殖增氧机设计

文中给增氧机设计了一种自动控制方案,这个方案的硬件电路采用了美国MICROSHIP公司生产的PIC16F873单片机.使得该系统具有智能增氧,水温报警的功能,可以有效的提高水产养殖的自动化程度和提高水产养殖的饲料利用率.     

边缘环境下的视频行为识别

边缘智能是一种新兴的智能计算模式,其将人工智能技术和边缘嵌入式设备结合,被广泛应用于物联网系统。智能摄像机是典型的边缘设备之一,它能提供低延迟的视频处理能力,适用于智能家居、智能交通、智能监控等领域。然而,由于摄像机的计算资源有限,传统的行为识别模型难以在本地完成计算任务。为解决这一问题,文中提出了一种基于边缘计算的架构,利用深度学习目标检测算法YOLO v3对视频行为进行识别。在该架构中,智能移动终端负责数据采集和压缩,边缘服务器承担大部分目标检测任务,而检测困难的目标和模型训练则由云服务器负责。为更好地适应边缘设备,本文采用轻量化的神经网络MobileNet替换YOLO v3模型的特征提取模块。经过测试,该架构能有效提取和识别视频中的静态和动态行为,为实现边缘计算环境下低成本、大规模的行为识别提供了有益的参考。     

合成介质对PEDOT催化染料敏化太阳电池光阴极性能的影响

采用聚3,4-乙烯二氧噻吩(PEDOT)/FTO为对电极,研究了合成介质对循环伏安法电聚合制备的PEDOT/FTO对电极性能的影响。通过SEM、CV、EIS、Tafel曲线,并首次采用SECM方法对所制备的对电极的电催化性能进行了表征。结果表明:在LiClO4水溶液和1-丁基-3-甲基四氟硼酸盐离子液体(IL)中制备的光阴极具有良好的电催化性能。J-V测试曲线表明,在LiClO4水溶液和IL中制备的光阴极所组装的DSSC器件的光电转化效率分别达6.4%和6.6%,接近于同等条件下以Pt对电极构建的DSSC器件的光电转化效率。     

The dental status of asthmatic British school children

Pancreatic cancer is a dismal disease. The 5-year overall survival ranges from 1% to 5%. Surgery is the only curative treatment available for this cancer, but it is indicated only in selected patients with a less than 4 cm tumor. In these patients, survival rate is about 30%. We have considered several aspects: the very difficult early diagnosis, the correct diagnostic flow chart, actual surgical procedures and new trends in biologic and genetic research. It is likely that better results can be achieved by defining an "early pancreatic cancer" and establishing how to detect it. This could be the wrigth one way is to significantly improve the survival of these patients.     

Biological, psychological and environmental predictors of the alcoholism risk: a longitudinal study

Interference reflection microscopy (IRM) was used to evaluate the status of cell matrix adhesions in the MCF-7 human mammary carcinoma cell line. Focal contacts were concentrated at the periphery of individual cells or small cell clusters. Close contact was detected as a band at cell peripheries and as localized patches throughout the ventral face of cells. The MCF-7 cells also exhibited a distinctive reflection pattern of an intensity midway between that of either focal or close contact. This novel reflection pattern was located primarily at the periphery of cells and often obscured visualization of focal contacts in live cells. A similar distinctive pattern was absent from the normal tissue-derived MCF-10A mammary epithelial cell line. Immunofluorescence staining using an antiserum that cross-reacts with both alpha(v)beta3 and alpha(v)beta5 integrins revealed a distribution of the vitronectin receptor similar to that of the novel adhesion pattern as well as to that of focal contacts. In addition, IRM demonstrated the presence of "tracks" associated with cells, which were also stained with the vitronectin receptor antiserum. The tracks are apparently residual material left behind as a result of cell migration. When MCF-7 cells were cultured in the absence of estradiol, the tracks were greatly diminished when visualized with either IRM or staining for the vitronectin receptor. In contrast, the addition of 17-beta-estradiol to the medium resulted in an increased presence of the tracks as well as the development of extensive close contacts throughout the ventral surface of cells and cell clusters. Cells treated with the estrogen antagonist ICI 182,720 in the presence of estradiol had few associated tracks, indicating that the process leading to the formation of these structures is dependent on an estrogen receptor-activated pathway. However, the antagonist did not prevent the estradiol-induced formation of extensive close contacts. The extensive close contact as well as the increase in trailing material suggests that estradiol may promote breast tumor cell motility. However, this migratory activity may be mediated by both estrogen receptor-dependent and -independent pathways.