DJM10湿度检定箱加湿不能自控的原因浅析     

刘建平  廖长银 《气象与减灾研究》2001,24(1):46-47

详细介绍了新型湿度检定箱内部气路原理及升降湿外围控制原理，并给出故障检修实例 ,供设备检定人员在维修工作中参考。  相似文献   

Kriging方法在区域土壤水分估值中的应用   总被引：74，自引：9，他引：74  

李海滨  林忠辉  刘苏峡 《地理研究》2001,20(4):446-452

土壤水分的观测对于地表参数化的发展以及气候变化的研究有着重要的作用。本文对大尺度区域土壤水分的估值进行了尝试:采用1987年中国102个气象站点1米土层四个季节的土壤水分值作为样本,运用KRIGING方法,通过对半变异函数的计算和分析,得出了所研究7个采集日的拟合函数,发现均符合球状模型,对模型有关的参数进行了拟合。并将插值结果与距离反比法进行了对比性检验,同时给出了KRIGING方法的估值精度。检验结果表明平均相对误差和标准偏差均以距离反比法较小,以样本量较大的f时段为例对检验结果进行了深入分析。由此得出了KRIGING方法内插估值的优势和不足,简要给出了提高估值精度的可能方案。最后对中国东半部f时段的土壤水分值进行内插成图。  相似文献   

Investigating the ancient Martian magnetic field using microwaves   总被引：1，自引：0，他引：1  

John Shaw  Mimi J. Hill  Steven J. Openshaw 《Earth and Planetary Science Letters》2001,190(3-4):103-109

The new microwave palaeointensity technique has been used to investigate samples from the Martian meteorite Nakhla. This technique is a promising new way to obtain absolute palaeointensity information regarding the ancient Martian magnetic field as recorded by the Martian meteorites. Assuming that a part of the magnetic remanence is of thermal origin and originating on Mars the two samples studied yield estimates of 4 μT for the Martian magnetic field at 1.35 Ga.  相似文献   

SOME NEW UNDERSTANDINGS OF LAND-SURFACE PROCESSES IN ARID AREA FROM THE HEIFE     

胡隐樵  高由禧 《Acta Meteorologica Sinica》1996,(2)

The survey for the HEIFE(Atmosphere-Land Surface Processes Experiment at Heihe RiverBasin,Western China)is given in the paper.The following basic subjects for land-surface process-es in arid areas are studied:(1)the general characteristics of the energy budget on ground surfacein arid areas;(2)the parameterization of the land surface processes;(3)the interaction betweenoasis and its desert circumstances,a special phenomenon in arid areas.The analysis shows that thesensible heat flux in the surface energy budget is in the majority,and the latent heat flux may beneglected.The influence of atmospheric stratification stability on the turbulent transfer of energyand substance must be considered in parameterization of land surface processes in arid areas.The“cold island effect”phenomenon in oasis and the“humidity inversion”phenomenon in desert nearoasis are the result of the interaction between them.The results would improve the understandingof land surface processes in arid areas.  相似文献   

扁椭球形雨滴和冰粒后向散射实验与理论研究   总被引：2，自引：0，他引：2  

王庆安  刘黎平  巢增明  张尧培 《大气科学》1996,20(6):735-744

本文介绍了对扁椭球形雨滴和冰（雹）粒散射能力的实验模拟和测量技术，报告了一个系列扁水(冰)椭球后向散射截面的实验测量结果；并用扩张边界条件法(EBCM)计算出相应的理论值，用Mie公式计算出等容积球形后向散射截面。将实验结果与理论计算作了综合对比分析，得到了若干有用的结论。  相似文献   

THE CHARACTERS OF ENERGY BUDGET ON THE GOBI AND DESERT SURFACE IN HEXI REGION   总被引：23，自引：0，他引：23       下载免费PDF全文

胡隐樵  杨选利  张强  左洪超 《Acta Meteorologica Sinica》1992,(1)

In the paper,the characters of surface energy budget on Huayin(Gobi)and the desert surface during the periodfrom 26 June to 31 August 1990 in the HEIFE have been analyzed,then have been compared with the observed resultsduring 4—19 September 1988 in the Pilot Observation Period of the HEIFE.The results show that the atmosphere is insuperadiabatic unstable state and there is a phenomenon of inverse humidity to form negative water vapour flux.Thesensible heat flux on the surface energy budget is in majority,but the latent heat flux may be neglected over the Gobi anddesert surface in the cloudless daytime in the summer.  相似文献   

THE CHARACTERS OF ENERGY BUDGET ON THE GOBI AND DESERT SURFACE IN HEXI REGION^*          下载免费PDF全文

Hu Yinqiao  Yang Xuanli  Zhang Qiang  Zuo Hongchao 《Acta Meteorologica Sinica》1992,6(1):82-91

In the paper,the characters of surface energy budget on Huayin(Gobi)and the desert surface during the period from 26 June to 31 August 1990 in the HEIFE have been analyzed,then have been compared with the observed results during 4-19 September 1988 in the Pilot Observation Period of the HEIFE.The results show that the atmosphere is in superadiabatic unstable state and there is a phenomenon of inverse humidity to form negative water vapour flux.The sensible heat flux on the surface energy budget is in majority,but the latent heat flux may be neglected over the Gobi and desert surface in the cloudless daytime in the summer.  相似文献   

微波炉在重量法测定硫中的应用     

姜锋  江荣燕 《岩矿测试》1993,12(2):135-136

采用玻璃砂芯坩埚过滤BaSO_4沉淀,微波炉代替马弗炉恒重坩埚、沉淀,重量法测定了矿石中的硫。方法准确,精密度好。微波炉不需预先升温,加热6min可达恒重,省时、省电。  相似文献   

基于地基微波辐射计资料对成都双流机场两次雷雨过程的分析     

宋静  傅文伶  张杰 《沙漠与绿洲气象(新疆气象)》2020,14(2):61-67

利用地基微波辐射计资料,比较了2017年7月成都双流机场的两次雷雨过程,根据天气形势分为"两高切变"和"东高西低"2类,在此基础上分析微波辐射计要素变化特征,结果表明:在垂直方向0～10 km,以相对湿度达到80%来区分干区和湿区,则两次过程前3 h,相对湿度在垂直方向均呈现"上下干、中间湿"三层结构,并早于近地层前2 h达到饱和状态;过程期间相对湿度呈现"上干、下湿"两层结构;过程结束后湿层抬高,低层变干。两次过程水汽含量充沛,保持在70 kg/m~2以上,峰值超过85 kg/m~2。每一次中阵雨发生后水汽含量都会短暂回落,但仍高于过程前的数值,不足2 h后再次发生中阵雨。由0℃线高度变化可知,降水过程中,暖区(温度≥0℃)内相对湿度≥90%;云中液态水含量主要分布于6 km以下,温度在0℃以上的液态水占比很高,故两次过程以暖云降水为主。雷雨前1 h左右有"低层气温上升,0℃层抬升,K指数、CAPE指数也明显增大"的典型特征。降水发生在相对湿度、水汽总含量、云中液态水含量和稳定度指数快速增长的波峰中。  相似文献   

Spectral index determination between 408 MHz and 5 GHz in the northern sky     

A.W. Jones  R.J. Davis  A. Wilkinson  G. Giardino  S.J. Melhuish  H. Asareh  R.D. Davies  A.N. Lasenby 《Monthly notices of the Royal Astronomical Society》2001,327(2):545-551

We present the joint analysis of two 5-GHz interferometric surveys of the northern sky, taken with different baselines. The two surveys were carried out on the Jodrell Bank 5-GHz interferometer based at Manchester. The Maximum Entropy Method is used to check the consistency of the two surveys and the final two-dimensional maps are used, together with low-frequency full sky surveys, to put constraints on the Galactic spectral index. It is found that synchrotron emission is the dominant process at high Galactic latitudes below 5 GHz.  相似文献