视频监控系统在船舶上的应用研究

文章就船舶视频监控系统具有通过装设在船舶上的摄像设备来监视船舶周围及船上各处活动的功能,提出在防范船舶碰撞、保障船舶航行安全、便利事故调查、保护船员人身安全等方面能起到重要作用.     

企业在技术创新中的知识产权保护策略

对我国而言,知识产权本身就是舶来品。在二十世纪以前,中国根本就不存在知识产权法。虽然从1982年后我国经历了高速、高水平的知识产权立法阶段,但中国人的知识产权意识依然很弱。就企业而言,这种单薄意识主要表现在企业经营者对知识产权的价值认识不足,知识产权作为一种无形资产能为企业带来远远大于有形资产的高收入着一点许多人视而不见。本文目的是使企业了解创新技术的知识产权应如何保护,同时认识到知识产权保护和实施有利于处进技术创新,并能够增加企业的财富和企业的竞争力。     

城市轨道交通BOT融资模式中的政府职能

阐述建设-运营-移交(BOT)项目成功的重要条件之一在于政府的积极参与和支持.结合我国第一个运用BOT融资模式建设的城市轨道交通的项目--深圳轨道交通4号线,从法律法规和监管角度,对轨道交通BOT实施过程中政府职能进行探讨,提出应该注意的问题和建议.     

基于VoIP的舰载信息网络的可靠性研究

随着IP技术的不断发展,VoIP业务必将成为舰载信息网络中的重要应用.介绍了影响基于VoIP的舰载信息网络可靠性的主要因素,并且从四个层次上分析了提高VoIP网络可靠性的关键技术,为设计和规划基于VoIP的可靠舰载信息网络提供参考.     

Tectonically active sediment dispersal system in SW Taiwan margin with emphasis on the Gaoping (Kaoping) Submarine Canyon

The sediment dispersal system in southwestern Taiwan margin consists of two main parts: the subaerial drainage basin and the offshore receiving marine basin. In plan view, this sediment dispersal system can be further divided into five geomorphic units: (1) the Gaoping (formerly spelled Kaoping) River drainage basin, (2) the Gaoping (Kaoping) Shelf, (3) the Gaoping (Kaoping) Slope, (4) the Gaoping (Kaoping) Submarine Canyon and (5) the Manila Trench in the northernmost South China Sea. The Gaoping River drainage basin is a small (3250 km²), tectonically active and overfilled foreland basin, receiving sediments derived from the uprising Central Range of Taiwan with a maximum elevation of 3952 m. The Gaoping Submarine Canyon begins at the mouth of the Gaoping River, crosses the narrow Gaoping Shelf (~ 10 km) and the Gaoping Slope, and finally merges into the northern termination of the Manila Trench over a distance of ~ 260 km. The SW Taiwan margin dispersal system is characterized by a direct river-canyon connection with a narrow shelf and frequent episodic sediment discharge events in the canyon head.In a regional source to sink scheme, the Gaoping River drainage basin is the primary source area, the Gaoping Shelf being the sediment bypass zone and the Gaoping Slope being the temporary sink and the Manila Trench being the ultimate sink of the sediment from the Taiwan orogen. It is inferred from seismic data that the outer shelf and upper slope region can be considered as a line source for mass wasting deposits delivered to the lower Gaoping Slope where small depressions between diapiric ridges are partially filled with sediment or are empty.At present, recurrent hyperpycnal flows during the flood seasons are temporarily depositing sediments mainly derived from the Gaoping River in the head of the Gaoping Submarine Canyon. On the decadal and century timescales, sediments temporarily stored in the upper reach are removed over longer timescales probably by downslope-eroding sediment flows within the canyon. Presently, the Gaoping Submarine Canyon serves as the major conduit for transporting terrestrial sediment from the Taiwan orogen to the marine sink of the Manila Trench. Seismic data indicate that the Gaoping Submarine Canyon has been eroding the Gaoping Slope intensely by presumed hyperpycnal flows and transporting sediments from the canyon head to the middle and lower reaches of the canyon. The middle reach is a sediment bypass zone whereas the lower reach serves as either a temporary sediment sink or a sediment conduit, depending on relative prevalence to deposition or erosion during canyon evolution. Contrast differences in channel gradient and travel length between the Gaoping and Amazon sediment dispersal systems suggest that the Gaoping (Kaoping) River-Canyon system is an active sediment dispersal system for transporting terrestrial materials to the deep sea. The fate of the Gaoping River sediment is the northern Manila Trench.     

直扩通信系统中DQPSK解调算法的改进研究

文章在阐述DQPSK调制算法原理和实现方法的基础上,在解调器采用旋转法解差分编码,并通过鉴相器,产生控制载波捕获与跟踪用的信号,克服了载波相位模糊度问题、数字信号可能极性倒置等问题。基于DQPSK调制改进算法的分析,利用Matlab对该算法进行仿真,结果表明,所述改进算法基本满足通信要求。     

SVPWM异步电动机矢量控制系统研究

分析了异步电动机矢量控制数学模型及空间矢量脉宽调制（SVPWM）方法,建立了基于空间矢量脉宽调制的异步电动机矢量控制仿真模型,并对三相异步电机的调速系统进行了仿真分析。仿真及实验结果表明所设计的三相异步电机调速系统具有转矩脉动小,输出电流波形好,系统响应快等优点。     

基于眼图分析的数字滤波选取方法分析

在数字通信系统中,由于存在码间串扰而影响通信质量,如何减小码间串扰的影响是数字信号传输面临的一个问题。经过分析发现,在传输过程中选取合适的滤波器及其特征参数能够不同程度地减小码间串扰影响。通过对相同干扰条件下,数字基带经过不同的滤波器后形成的眼图进行分析,进而选取了适合传输的滤波器及其特征参数,用最佳传输滤波器的方法减小了码间串扰,从而提高了信号的传输质量。     

对空情报雷达组网的关键技术与发展构想

雷达组网作为现代对空情报雷达发展的主要方向,是提高对空情报雷达综合探测能力和电子对抗能力的一种有效途径。文章介绍了有关雷达组网的基本概念,讨论了对空情报雷达组网的关键技术。研究了对空情报雷达组网的发展趋势,提出了未来对空情报雷达的发展构想。     

具有相位补偿功能的过零检测方法研究

本文针对电力电子电路中谐波信号过零检测不准确的问题,提出一种带有相位补偿功能的过零检测方法。计算机仿真表明,此种方法可以有效地提高过零检测的准确性。