实时数据平台在火电厂中的应用实例

本文介绍了实时数据平台的功能，以及在某火电厂中的具体应用，包含应用方案、主要功能和应用的实际情况等方面的内容。     

时钟芯片PCF8563接口及驱动设计

介绍了时钟芯片PCF8563的片内结构，阐述了I2C总线规范，并给出了该芯片的典型接口电路以及相应的I2C总线驱动程序。     

浅析基于校园网络的流媒体技术应用

在校园网络中多媒体的传输是应用的主流，多媒体业务流由于其数据量大、实时等特点，对网络传输提出相应的高带宽、低传输时延、同步和高可靠性等方面要求，由于流媒体技术能够很好地解决这些问题，从而使流媒体技术在校园网络中得到广泛应用。     

基于鉴相原理的金属探测方法研究

依据运动的金属颗粒其方向性可引起载波相移的物理特性,提出了一种基于鉴相原理的金属探测方法。重点从理论上分析了此种方法的物理依据和建模方法。然后对金属探测仪锁相环路进行了方案设计。最后对系统的稳定性进行了理论分析。     

新型变电站火灾监测技术之探讨

对具有强电磁干扰的变电站的火灾隐患进行预防和监测,多年来人们一直在探讨,如单独利用传统的电子传感器或采用新型的光纤光栅温度传感系统来实施远程监控,但由于传输导线的绝缘性能不稳定、光纤光栅传感器的成本较高、施工工艺复杂,故不能在电力火灾的监控中广泛采用.通过对烟雾火灾报警与光纤光栅测温相结合的探讨,不仅能对变电站的关键热点实施实时监测,而且还能对电力系统进行宏观监控以预防电力火灾.     

利用ATM网络技术防止实时攻击

有效的入侵检测是保证系统安全所必需的．介绍了异步传输模式的特点，研究了利用这种网络技术来防止对密码协议中信息的实时传输进行攻击的一种方法，该方法可为指定连接的带宽和信元延迟提供保证．利用这些机制来检测非法入侵，保证网络上信息的实时传输．     

Opportunities for Real-Time Digital Reference Service

Summary

This article explores the opportunities that real-time digital reference service can offer to a variety of library settings from the independent public library to the large multi-campus university or the multi-national corporation. There are many occasions when a real-time digital reference service will be the optimal solution for a portion of a library's reference service. The authors' goal is to offer their original ideas, and examples from the literature, that will stimulate thought about real-time digital reference services that could be offered by your libraries. The numerous ideas and examples should provide the reader with workable methods for extending the reach of reference service to under-served populations.     

CCD相机的数据采集与实时处理

通过对CCD光电图像传感器原理的认识,结合单片机,数据采集技术,数字图像分析与处理,实现相机的自动调节和数据的实时处理。研究设计了一种基本的图像采集系统,可以为各种信号的采集和处理提供基本模块,且使用了通用的51单片机实现控制功能。     

Science Letters:Detection of Catabacter hongkongensis in polluted European water samples

The Catabacteriaceae is a new bacterial family with a unique member: Catabacter hongkongensis is a strictly anaerobic, non-sporulating, Gram-positive coccobacillus that is phylogenetically related to some clostridial clusters. Little is known of its epidemiology and environmental distribution, but the inclusion of its 16S rRNA gene sequence in GenBank has allowed it to be detected qualitatively. As a first approach for prospective surveys, a real-time polymerase chain reaction (PCR) procedure to identify C. hongkongensis has been developed. The presence of Catabacteriaceae in 29 water bodies subjected to possible human or animal impact has been investigated. Four of them were positive. The results confirm that highly polluted water can contain C. hongkongensis.