共查询到13条相似文献，搜索用时 62 毫秒
1.
EL电接风“个别灯泡不亮”故障多发生于指示器和长电缆中 ,可按下列方法尽快寻找故障部位 :先拔下长电缆的二十线插头 ,合上风向扳键开关 .然后用一根导线一端插入指示器左边二十线插座的B2孔 ,另一端插入该插座A排的相应插孔 (例如 ,东风灯泡不亮 ,应插入A1孔 ) ,若指示灯泡不亮 ,说明故障在指示器内部 ,应逐步检查灯泡是否烧坏 ,二十线插座 (头 )是否严重氧化或脱焊 ,连接线是否断开 ,隔离二极管是否损坏等 ;若灯泡能亮 ,说明故障在长电缆 (感应器少见 ) ,应逐步检查二十线插座 (头 )或十二线插座是否严重氧化或脱焊 ,长电缆是否断路等… 相似文献
2.
自动气象站常见故障的判断和维修 总被引：1，自引：5，他引：1
到目前为止 ,全省已建成投入使用的自动气象站 (以下简称自动站 )达 30 0多个 ,如何使它正常工作 ,为天气监测服务 ,做好维修保障是非常重要的。下面介绍自动站的一些常见故障及维修方法 ,供自动站维护人员参考。1 自动站监测系统的组成简介 大部分的自动站监测系统都由自动站数据采集设备 (通常所说的自动站 )和数据处理中心两大部分组成。自动站数据采集设备主要由如下 5个部分组成 :传感器单元 ;连接电缆 ;数据采集器 ;供电单元 ;通讯单元 (图 1 )。数据处理中心由数据处理计算机和调制解调器、通讯线路组成 (图 2 )。其中调制解调器… 相似文献
3.
电接风常见的故障和检修分析 总被引：1，自引：0，他引：1
电接风向风速计 (以下简称为“电接风” )用于记录风的行程 ,并每隔两分半钟记录一次瞬时风向。记录纸经过整理后 ,可得出任意十分钟的平均风速及其相应风向。它由感应器、指示器和记录器三部分组成 ,感应器安装在室外的杆子上 ,指示器和记录器则置于室内 ,并通过一根十二线电缆、二十线电缆连接成为一个整体。电接风广泛应用于气象、监测、环保、机场、航海等部门。现时 ,电接风是气象台站的主要观测仪器之一 ,每年撤换仪器的主要任务 ,检修台站有问题的电接风。现介绍一些常见的故障及其检修方法供台站参考。1 故障现象 :瞬时风速无指示… 相似文献
4.
我局从1999～2003年,测报工作连续4年未出现错情,在此期间共有1个250个班,9个百班无错通过上级业务部门验收.在仪器保管、使用、维护上符合要求,对外报送的各种表、簿都能做好出门合格. 相似文献
5.
Summary Considering the effects of causal mechanics on geophysical problems enables us to explain a number of phenomena, which cannot
be explained from conventional positions. This paper shows that the introduction of the force of causality in a simple barotropic
hydrodynamic model of weather forecasts results in the outcomes, which, on the one hand, can not be described from the positions
of classical hydro-thermodynamics, whilst on the other hand, exist in nature. 相似文献
6.
A. A. Lavrova E. S. Glebova I. V. Trosnikov V. D. Kaznacheeva 《Russian Meteorology and Hydrology》2010,35(6):363-370
Due to the complex orography and the presence of the moisture-saturated air, the Mediterranean region is characterized by
the increased baroclinic and convective instability, that leads to the sudden cyclogenesis and the formation of dangerous
weather phenomena. The results are given of the investigation of formation mechanisms of Mediterranean cyclones, peculiarities
of stages of their evolution and dynamical processes, which occur throughout the atmosphere, using the regional numerical
ETA model of the atmosphere by the example of individual cases of the cyclogenesis over the Mediterranean Sea. It is revealed
that the cold Arctic air outbreak (the intrusion of the cold Arctic air) to the south of the Western Europe, leading to the
formation of the areas of the baroclinic instability and the increased moisture content of the air in the area of the vortex
origin, favors the cyclogenesis. The use of the vertical coordinate η in the model enabled to compute more precisely the vertical
wind speed, therefore, the influence of the orography on the moisture content and precipitation increase became pronounced.
The transformation of the structure of meteorological fields in the course of the development of vortexes is considered. The
computation of the helicity is made, and it is shown that this characteristic can be one of the earliest predictors of cyclogenesis. 相似文献
7.
流场配置及地形对西南低涡形成的动力作用 总被引：10，自引：8，他引：10
本文采用定常二层模式讨论较小地形及高、低层流场配置对西南低涡形成的动力作用。指出了西南低涡的形成是与盆地、河谷以及其上气流分层有关的一种定常态.在上、下为西风分层时期,低层的浅薄暖湿西风有利于西南低涡的形成.在上、下为东、西风分层时期,上层浅薄东风亦有利于西南低涡的形成.小型的凸起山脉对西南低涡的形成没有作用. 相似文献
8.
Chunguang CUI Wen ZHOU Hao YANG Xiaokang WANG Yi DENG Xiaofang WANG Guirong XU Jingyu WANG 《大气科学进展》2023,40(4):711-724
Here, we analyze the characteristics and the formation mechanisms of low-level jets(LLJs) in the middle reaches of the Yangtze River during the 2010 mei-yu season using Wuhan station radiosonde data and the fifth generation of the European Centre for Medium-Range Weather Forecasts(ERA5) reanalysis dataset. Our results show that the vertical structure of LLJs is characterized by a predominance of boundary layer jets(BLJs) concentrated at heights of 900–1200 m.The BLJs occur most frequently at 230... 相似文献
9.
1引言我国执行接地降阻剂测试的技术标准是全国电力系统起草的:“接地降阻剂暂行技术条件修改稿”。在技术要求中要求接地降阻剂的酸碱值应在7￣12范围内。在实际使用中发现该技术要求对接地降阻剂的酸碱值要求范围并不合理,需要分析和讨论。2接地降阻剂的PH值接地降阻剂的酸碱性对地网的使用寿命至关重要,为了不让接地降阻剂腐蚀接地体或者减弱接地降阻剂对接地体的腐蚀,在接地降阻剂测试的技术要求中,对接地降阻剂的酸碱度有一定的限制。国内各厂家用于生产接地降阻剂的偏弱酸的盐类进行了对镀锌钢材腐蚀的试验,结果是这些镀锌钢材均受到… 相似文献
10.
On the determination of the height of the Ekman boundary layer 总被引：1，自引：1，他引：1
S. S. Zilitinkevich 《Boundary-Layer Meteorology》1972,3(2):141-145
The heighth
of the Ekman turbulent boundary layer determined by the momentum flux profile is estimated with the aid of considerations of similarity and an analysis of the dynamic equations. Asymptotic formulae have been obtained showing that, with increasing instability,h
increases as ¦¦1/2 (where is the non-dimensional stratification parameter); with increasing stability, on the other hand,h decreases as –1/2. For comparison, a simple estimate of the boundary-layer heighth
u
determined by the velocity profile is given. As is shown, in unstable stratification,h
u
behaves asymptotically as ¦¦–1, i.e., in a manner entirely different from that ofh
. 相似文献
11.
文章选用阴山山脉山北乌拉特后旗、白云、达茂旗、苏尼特左旗、化德,山南杭后旗、包头、呼和浩特、察右前旗、兴和1971—2000年气温、降水量、天气现象等资料进行对比分析,得到阴山山脉对内蒙古自治区中部地区气象要素影响初步结论。 相似文献
12.
13.
The impact of high resolution modern vegetation cover on the West African climate is examined using the International Centre for Theoretical Physics Regional Climate Model implementing the NCAR Community Land Model. Two high resolution 25 km long-term simulations driven by the output from a coarser 50-km resolution simulation are performed for the period 1998–2010. One high resolution simulation uses an earlier and coarser-resolution version of plant functional type distribution and leaf area index, while the other uses a more recent, higher-quality, and finer-resolution version of the data. The results indicate that the new land cover distribution substantially alters the distribution of temperature with warming in Central Nigeria, northern Gulf of Guinea and part of the Sahel due to the replacement of C4 grass with corn; and cooling along the coastlines of the Gulf of Guinea and in Central Africa due to the replacement of C4 grass with tropical broadleaf evergreen trees. Changes in latent heat flux appear to be largely responsible for these temperature changes with a net decrease (increase) in regions of warming (cooling). The improved land cover distribution also results in a wetter monsoon season. The presence of corn tends to favor larger precipitation amounts via more intense events, while the presence of tropical broadleaf evergreen trees tends to favor the occurrence of both more intense and more frequent events. The wetter conditions appear to be sustained via (1) an enhanced soil moisture feedback; and (2) elevated moisture transport due to increased low-level convergence in regions south of 10N where the most substantial land cover differences are present. Overall the changes induced by the improved vegetation cover improve, to some extent, the performance of the high resolution regional climate model in simulating the main West African summer monsoon features. 相似文献