电力线

The distribution of the equipotential line and power line of the electric current field brought by the coaxial-columniform electrode in the water was described by the experiment, and the result of the experiment is squared with the theory.

通过实验获得同轴圆柱面形电极在水中产生的电流场的等位线，并根据等位线与电力线垂直的原则绘出其电力线分布。

In this paper, the low-voltage power line channel characteristics is researched, a scheme of Broadband Power Line Communication based on orthogonal frequency division multiplexing is discussed and analyzed by simulation.

本文研究了低压电力线信道特性，探讨了基于正交频分复用的电力线高速数据传输方案并进行了仿真分析。

In order to restrain the high noise in low voltage power line, a spread spectrum scheme for PLC is also designed in this system.

为抑制我国低压电力线环境上的严重噪声，本文也为该系统设计了适合于电力线通信的扩频方案。

The text analyzed the channel characteristic of low voltage power line, and make a lucubration about modulating mode of concentrate calling meter system in using low voltage power line.

本文分析了低压电力线的信道特性，并对利用低压电力线载波的集中抄表系统的调制方式展开深入研究，提出采用正交频分复用技术。

The low-voltage power transmission line model testing and simulation of the power line, as well as information transmission experiments fully verify the proposed method is effective and practical.

通过对低压电力线传输模型的测试和模拟以及对电力线信息传输的实验，充分验证了本文提出方法的有效性和实用性。

Based on power line transmission characteristic, this thesis set up a power line model using theory of uniform transmission line; design low voltage communication simulation and experiment system based on the model.

本课题基于电力线传输特性的分析，应用均匀传输线理论建立了电力线模型，设计了以该模型为基础的低压电力线载波通信模拟实验系统。

The power line transmission model has been established to explain the direct sequence spread spectrum is the the best method to modulate the signal to overcome the power line's shortcomings of high reduction, high noise, high distortion, and so on and make it possible to be a workable correspondence medium.

论文建立了低压电力线的传输模型，在此基础上提出采用直接序列扩频载波通信来克服电力线作为传输介质具有的高削减、高噪声、高变形等缺点，使电力线成为一种可靠的通信媒介。

There are complex variations in realistic low-voltage power line network topology framework.In order to study the low-voltage power line transmission channel model,a model to describe the power line network channel topology framework is established in terms of basic characteristics of low-voltage power line network in this paper.

低压电力线网络拓扑结构变化复杂，为了研究低压电力线信道传输模型，根据低压电力线网络的基本特点建立了描述电力线网络拓扑结构的模型，利用模型把低压电力信道作为一个过程去描述，建立了节点信号传输函数来推导低压电力线网络的传递函数。

The transmission characteristics of power line channel were introduced,and the power line communication system was analyzed from the field of home network.

对电力线信道的传输特性进行了介绍，然后从家居网络领域的角度对电力线通信系统进行了分析，给出了电力线作为传输介质家居网络的具体方案。

As communicating madia is power line ,which needn't the extra line , and not take in the existing frepuncy resource.In the power system ,the power line is using steadily and reliable high press power line as the signal's trans madia,which may save a great deal of the building investment,in additional to the route is suitble ,scurity and may reuse the far away mobile signal ,of which makes this power system develop a particular communicating way ,while in number micro-wave,one point more address,optical fiber,super-high frequency repeatly renew today ,which also last developing.

由于电力线载波在电力系统中使用坚固可靠的高压电力线作为信号的传输媒介，可节省大量的通道建设投资，再加上电力线载波信息传输稳定可靠，路由合理，安全保密以及能够同时复用远动信号等特点，使得这种电力系统独有的通信方式在数字微波，一点多址，光纤，特高频等通信方式相继出现的今天仍得到持续的发展。

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。