电力线

By simulation and experiment, it was evincible that the improved spread spectrum design can be used in power line carrier communication.

仿真和实验表明：扩频同步技术的改进方案用于电力线传输是可行的。

But last week's investment by Web search leader Google, the media conglomerate Hearst and bankers at Goldman Sachs in a Germantown, Md., company called Current Communications Group has many wondering if the time is finally right for the oft-ignored BPL.

然而，批评者表示，他们对电力线宽带技术是否能完成任务表示怀疑。Jupiter研究公司的分析师Joe Laszlo说： Google和高盛的投资令人印象深刻。

Because the powerline is a complicated medium, selecting appropriate modulation means is a pivotal question in order to guara- ntee the quality of signals.

因为电力线是一种复杂的通信媒体，要保证通信质量，选择合适的调制方式是一个关键问题。

So this paper presented an intelligent meter reading system based on power transmission line carrier.

为此本文研制了一种利用电力线载波传输的智能化抄表系统。

Through comparing and analyzing some experimental data, this paper puts forward that power line has very low input impedance, and it attenuates and jams the signal greatly. Because all these characteristics are time-variable, it's very hard to establish a precise mathematical model.

文中通过对各种实验数据的比较分析，认为电力线的输入阻抗较小，对信号的衰减强，干扰大，且具有很强的时变性，难以提出一个准确的数学模型。

And also widely using in the power management system,technology aytomation control system,distant control system,brained space and so on .

利用电力线作为通信媒介，无需另外架设通信线路，也不占用现有的频谱资源。

The paper also combines the latest OFDM technology to research and design the channel encoding technology and modulating and demodulating technologies of power line communicating system, and gives the simulating results of system design.

并结合目前最新的OFDM技术对电力线通信系统中的信道编码技术和调制解调技术进行了研究和设计，并给出了系统设计的仿真结果。

But the noises, the attenuation and the multipath propagation inhering in the powerline make it very difficult to realize such kind of communication system.

但是电力线信道上存在的各种噪声、衰减和多径传播等问题，这些都大大提高了通信的难度。

An interface between microprocessor and power line carrier communication module is described in order to achieve ballast control via power line.

利用所设计的单片机与电力线载波通讯模块的智能接口，实现高压钠灯的远程监控，适应了照明控制技术电子化、集成化和网络化的发展趋势。

However, using proper technologies, low voltage power line carrier communication system can meet the requirement of application.

但是，只要采用合适的技术，仍然能使低压电力线载波通信达到实用化的要求。

The absorption and distribution of chromium were studied in ryeusing nutrient culture technique and pot experiment.

采用不同浓度K2CrO4(0，0.4，0.8和1.2 mmol/L)的Hoagland营养液处理黑麦幼苗，测定铬在黑麦体内的亚细胞分布、铬化学形态及不同部位的积累。

By analyzing theory foundation of mathematical morphology in the digital image processing, researching morphology arithmetic of the binary Image, discussing two basic forms for the least structure element: dilation and erosion.

通过分析数学形态学在图像中的理论基础，研究二值图像的形态分析算法，探讨最小结构元素的两种基本形态：膨胀和腐蚀；分析了数学形态学复杂算法的基本原理，把数学形态学的部分并行处理理念引入到家实际应用中。