the paper discusses the development and application of power line carrier communication technology. aiming at enhancing the high speed and reliability of the communication on high voltage power line, two schemes: digital single sideband and tcm are proposed.

1、

this paper discussed the scheme of interpolation and decimation, the scheme of digital single-side-band modulation, and the implementation of digitized power line carrier equipment.

着重介绍内插和抽取原理，数字单边带调制原理，以及应用这些原理和DSP技术实现全数字化载波机的方法。

互联网摘选

2、

a temperature and humidity measuring system applied with digital single bus apparatus is introduced, and the technique produced by dallas company recently is also described.

文章介绍了利用DALLAS公司推出的单总线器件及其技术组建温湿度测控系统。

互联网摘选

3、

a environmental condition monitoring system was designed with digital single bus technique and ds serial devices of dallas company in america.

介绍了利用美国DALLAS公司推出的DS系列新器件和单总线技术实现环境状态监控系统的设计。

互联网摘选

4、

study on integrated system on digital single-beam hydrographic surveying and charting based on the universal software autocad

基于通用图形平台的全数字单波束海洋测量和成图一体化系统开发和应用

互联网摘选

5、

digital single chip controller for vvvf system

数字式单芯片变频调速控制器

互联网摘选

6、

the basic principle of digital single point incremental forming of sheet metal was described.

介绍了金属板料单点渐进成形的基本原理；

互联网摘选

7、

the application of intelligent digital single bus temperature sensor in test and control field

单总线数字式智能型温度传感器在测控领域中的应用

互联网摘选

8、

design of environmental condition monitoring system with digital single bus technique

数字单总线环境状态监控系统的设计

互联网摘选

9、

p. g. zero population growth

人口零增长

互联网摘选

10、

and that the nearer a society approximates to zero population growth;

人口增长率接近于零的社会离我们接近，

互联网摘选

11、

and the hope is to reach a zero population growth rate by 2010.

到2010年的时候，有希望达到人口增长率为零。

互联网摘选

12、

the goal is zero population growth.

目标是实现人口的零增长。

互联网摘选

13、

the nearer a society approximates to zero population growth, the older its population is.

一个社-会的人口增长率越接近零，其人口便越老龄化。

互联网摘选

14、

a field pot experiment was conducted to study the influence of potassium fertilizer ( k_2so_4) on the phytoavailability of cd in soils with single stress of cd and combined stress of cd and pb.

采用室外盆栽模拟试验，研究了在镉单一污染及镉、铅复合污染的土壤中，钾肥（K2SO4）的施用及其施用水平对镉的植物有效性的影响。

互联网摘选

15、

in the cd single pollution experiment, the relative membrane permeability of the leaves increased with the cd concentration in the soil by s-function and the correlation coefficient was 0.999.

在Cd单一污染条件下，叶片细胞膜透性与土壤中Cd添加浓度呈S函数关系，相关系数为0.999。

互联网摘选

16、

effects of pb, cd single and joint pollution on some physiological characters of hypnum revolutum

Pb、Cd单一及复合污染对弯叶灰藓某些生理特性的影响

互联网摘选

17、

effect of zn and cd single and combined pollution on metallothionein content of earthworm in soils

土壤锌镉单一及复合污染对蚯蚓金属硫蛋白含量的影响

互联网摘选

18、

effects of cd single and cd, zn combined pollution on physiological characteristics of corn seedling

Cd单一及Cd、Zn复合污染对玉米幼苗生理特性的影响

互联网摘选

19、

in order to improve teachers'quality, based on the new understanding of teacher profession and the nature of teacher education, british government has made several attempts on initial teacher education reform recently.

近年来，为提高教师质量，英国政府根据对教师职业及教师教育性质的新理解，在职前教师教育改革方面进行了很多尝试。

互联网摘选

20、

the new period education of profession and skill in prison

论新时期的监狱职业技能教育

互联网摘选