低压

This paper discusses the status of low-pressure pipeline irrigation technology related to the concept and main content .

本文针对这一现状介绍了低压管道灌溉技术的相关概念和主要内容，并以山西省阳高县大白登镇基本农田整理项目为例，详细介绍并分析了在土地整理项目中低压管道灌溉系统的规划设计方法以及相关水力计算。

With the increasing of the number of power cables and loads in mediumvoltage systems, low-resistance grounding and arc suppression coil groundinghave been the primary grounding methods of the neutral.

随着中低压配电网中电力电缆数量的增加以及用电负荷的增大，系统中性点采用小电阻或消弧线圈接地方式已取代过去的不接地方式成为中低压配电网运行方式的主流。

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。

Methods The UV luminometer was used to measure the relative intensity of UVB and UVC after irradiation of 2 low pressure mercury lamps on 11 kinds of external used medicines and 2 kinds of cosmetics.

为此，我们对11种常用药和2种化妆品对紫外线照射强度的影响程度进行了测试，报道如下。材料和方法紫外线治疗仪采用北京产手提式ZYY-8型15 W低压汞灯和手提式JY-3型20 W低压汞灯，该两种灯辐射254～313 nm的中短波紫外线。

Also, the study shows that as the base state of the Aleutian and Iceland low experiences change, the mean square deviation on a secular basis also changes, exhibiting dominantly increased linear variability in the study period.

研究还指出，阿留申低压区及冰岛低压区在基本态改变的同时，标准差也有长期变化，而且主要表现为近百年中变率线性增大。

Based on the analysis of potential vorticity and elements on isentropic surface about the typhoon 9608 and its heavy rain outside, the study is to show the PV structure and the interaction with midlatitude weather systems. It shows the feature of severe rainstorm dynamic and thermodynamic process. A picture about the process of heavy rain amplification is given.

通过对9608号台风低压及其外围暴雨位涡和等熵面上物理量场的分析，揭示了台风低压北上诱发暴雨过程的位涡场的结构及冷空气对暴雨增幅的作用，给出此次暴雨增幅过程的图像。

According to our special application, a simplified channel model of the power line under the oil well is brought, and the simulation is done for the channel characteristics.

本论文首先对低压电力线传输特性进行了讨论，并根据实际应用背景，提出油井中低压电力线信道的简化模型，并对其信道特性进行了仿真研究。

In this paper, typical physical topology and its characteristics of low-voltage network are analyzed in detail, topology model of power line communication over low-voltage network is given for simulation, and the means based on Ant Colony Optimization is put forward, which is used to construct the power line communication networks without any available information of power line wiring in a building On the basis of these, the effect and anti-destruction means are analyzed and tested by emulating experiments.

该文详细地分析了典型低压配电网物理拓扑结构和特点，给出了低压配电网通信仿真拓扑模型，提出了一种适用于未知建筑物电力线拓扑结构条件下的蚁群电力线组网方法；在此基础上，通过仿真试验验证了该组网路由算法的有效性和抗毁性。

The wave length of the twin line of sodium atomic spectra is observed directly with WDMI grating monochromator.

0引言低压钠灯是实验室常用的单色光源，对低压钠灯谱线的分析，已有许多相关研究。

The numerical simulations reproduce fully the evolution characteristics of SW from monotone increasing to monotone decreasing.

分析表明这个中层涡旋实际上是中层大气里一个中尺度闭合低压造成的，这个闭合低压是由高空槽加深发展而来的。

Cynanchum Lingtai apricot production in the average weight 65 grams, the brightly-colored fruit, juicy rich, sweet-sour taste, sweet from the nucleolus, when the late Qing Dynasty famous Shaanxi, Gansu provinces, the Qing imperial court Tongzhi tribute for years.

灵台生产的牛心杏平均单果重65克，果实色泽鲜艳，汁多味浓，甜酸适口，离核仁甜，清末时就驰名陕、甘两省，清同治年间曾为朝廷贡品。

Chenopodium album,Solanum nigrum, and Amaranthus retroflexus were very susceptible to the herbicides. Polygonum persicaria and Abutilon theophrasti were relatively less susceptible to the herbicides, and Lycopersicon esculentum was not susceptible to it. The relationship between reduction rates of weed biomass and PPM values of weed leaves 2,4, and 6 days after treatment was established.

供试的6种杂草对该混剂的敏感性存在显著差异：红心藜Chenopodium album、龙葵Solanum nigrum和反枝苋Amaranthus retroflexus对该混剂最敏感，ED90值分别为47.65、71.67和29.17g/hm2；春蓼Polygonum persicaria和苘麻Abutilon theophrasti敏感，ED90值分别为96.91、114.20g/hm2；而番茄不敏感。