双音多频通信接口的设计

介绍了一种利用双音多频(DTMF)信号进行数据通信的接口电路,具体阐述了该电路的组成原理以及软硬件的实现方法.     

宽带CDMA系统中线性空时多用户接收机结构与性能分析

2000年美国SEC在制定公平披露规则的同时制定了规则10b5-1和规则10b5-2。规则10b5-1规定,如果交易人在买进或卖出证券时“知道”该有关发行人或证券的非公开的重大信息,那么他的证券交易就属于内幕交易。规则10b5-2规定,家庭成员之间或其他个人关系之间私用机密信息也应承担私用理论下的责任。文章最后指出,我国法律应该将内幕人员的家庭成员也纳入内幕交易人的范围。     

变电站直流高频开关电源的检测与验收

直流系统可靠与否直接关系到电网的安全,随着高频开关直流电源系统大量使用,该种电源系统的建成投运验收交接和运行检测、检查,已显得极为重要,从柜体、元器件外观的检查、整套系统电气技术参数检测都必须严格进行,并根据不同的目的进行相应项目的检查,运行中更应定期检查,及时发现存在的隐患,保证其在规定的参数下运行,以提高电池的服役年限。     

疲劳驾驶研究进展综述

疲劳驾驶是世界性研究难题,目前已发展为国内交通安全研究热点之一,基于对疲劳驾驶相关专利、文献检索分析,得到国内外疲劳驾驶研究现状、研究热点与发展领域;然后对疲劳驾驶识别、疲劳驾驶预警,以及疲劳驾驶消除与控制三大核心技术的发展现状进行综述,指出疲劳驾驶发展方向。     

Turbo码在无线移动通信中的应用

首先分析了Turbo码的基本编、译码结构与原理，然后探讨了它在无线移动通信系统中的几个具体应用。     

微电子机械系统ADXL345的应用研究

微电子机械系统因其成本低、可靠性高、功耗低、体积小和重量轻等特点,在便携式电子设备中应用广泛。文章通过S3C2440针对美国ADI公司最新推出的三轴数字加速度计ADXL345进行运动特性的检测研究,为该器件的应用开发提供了一种方法。     

烷基酚聚氧乙烯醚应用在纺织品中对环境的影响

列举了APEO在纺织品中的一些应用和检测纺织品中其含量的检测方法。阐述了应用在纺织品中的APEO对环境的影响，并提出一些应对及补救措施。     

Application of early risk detection concepts and methods to environmental health. A German feasibility study

Early risk detection is essential for being able to address the most important environmental health risk‐topics in a persistent and prospective manner. In support of the action programme “Environment and Health” (APUG) of the German Federal Ministry of Health and Social Security (BMGS) and the Federal Ministry for the Environment, Nature Conservation, and Nuclear Safety (BMU) which recommended that a detection and evaluation system for the timely recognition of emerging risk problems be developed, a qualitative feasibility study was commissioned. The results of this study are presented here and support the development of an early risk detection system based on the insights gained from the investigation of case studies and the differentiation and presentation of a risk typology, methods, tools, and suggested organizational processes.

The study has shown that early risk detection includes the identification, characterization, evaluation and dissemination of information on possible risks as well as the circumstances of appearance and distribution. The goal is the recognition of possible risks in order for risk management to be able to introduce swift and appropriate measures. Consequently, it can also serve as an instrument towards further development of a balanced and structured implementation of the precautionary principle in the environmental health policy.     

Detecting jumps from Lévy jump diffusion processes

Recent asset-pricing models incorporate jump risk through Lévy processes in addition to diffusive risk. This paper studies how to detect stochastic arrivals of small and big Lévy jumps with new nonparametric tests. The tests allow for robust analysis of their separate characteristics and facilitate better estimation of return dynamics. Empirical evidence of both small and big jumps based on these tests suggests that models for individual equities and overall market indices require incorporating Lévy-type jumps. The evidence of small jumps also helps explain why jumps in the market index are uncorrelated with jumps in its component equities.     

含硫油气井中的硫化氢气体检测和防护应急程序

文章详细分析了含硫油气井勘探开发中硫化氢气体产生的来源、硫化氢的主要检测方法,并重点论述了防护硫化氢的应急管理程序。