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951.
网络数字雹雨分测仪技术试验研究 总被引:1,自引:0,他引:1
介绍了网络数字雹雨分测仪的传感器结构和工作原理:利用浮力定律,翻斗计量,微机记录,网络传输等工作原理,模拟实验了理论数值和实验数值间的计量误差,探讨了误差产生的原因及野外观测调节技术和蒸发补偿订正等.经试验表明,各种部件结构科学、稳定、误差小、整体性能良好.野外观测资料表明,网络雹雨分测仪所测雨量与自动站观测的雨量误差在可接受范围;由于能同时进行雹雨分测,对极端冰雹天气具有实时监测优势,在野外林果和农作物雹灾危害评估中有重要作用,具有与遥测雨量计和其他遥测气象要素仪器一样的现代化水平,可广泛应用于农业和林业灾害野外监测网络之中. 相似文献
952.
中尺度气象模式对风场的预报效果与参数化方案的适应性紧密相关.以内蒙古高原丘陵地形、江苏平缓的海陆交界地形2种典型下垫面试验风电场为模拟区域,分别用WRFV3.2 (Weather Research and Forecast Model)模式自带的6种物理过程参数化组合方案预报了2010年1月和7月两个风电场区域的风速和风向,对比分析了参数化组合方案差异对风场预报的影响.结果表明:①内蒙古试验区,边界层MRF方案描述的边界层结构较MYJ方案合理;微物理方案WSM3在夏季的风速预报能力优于WSM6,而冬季相反;复杂地形区域的风场预报需考虑陆面过程参数化方案,尤其是夏季降水发生后,陆面过程对于边界层结构的影响增大,选用Noah优于无陆面过程.②江苏试验区,边界层MRF方案描述的边界层结构较MYJ方案合理;1月陆面过程RUC方案优于陆面热量扩散和Noah;7月陆面热量扩散方案优于RUC和Noah.③风向预报6个方案的预报风向统计与实际记录风向统计有较好的一致性,风向概率分布相似,盛行风向一致且稳定. 相似文献
953.
J. Todd Hoeksema Yang Liu Keiji Hayashi Xudong Sun Jesper Schou Sebastien Couvidat Aimee Norton Monica Bobra Rebecca Centeno K. D. Leka Graham Barnes Michael Turmon 《Solar physics》2014,289(9):3483-3530
The Helioseismic and Magnetic Imager (HMI) began near-continuous full-disk solar measurements on 1 May 2010 from the Solar Dynamics Observatory (SDO). An automated processing pipeline keeps pace with observations to produce observable quantities, including the photospheric vector magnetic field, from sequences of filtergrams. The basic vector-field frame list cadence is 135 seconds, but to reduce noise the filtergrams are combined to derive data products every 720 seconds. The primary 720 s observables were released in mid-2010, including Stokes polarization parameters measured at six wavelengths, as well as intensity, Doppler velocity, and the line-of-sight magnetic field. More advanced products, including the full vector magnetic field, are now available. Automatically identified HMI Active Region Patches (HARPs) track the location and shape of magnetic regions throughout their lifetime. The vector field is computed using the Very Fast Inversion of the Stokes Vector (VFISV) code optimized for the HMI pipeline; the remaining 180° azimuth ambiguity is resolved with the Minimum Energy (ME0) code. The Milne–Eddington inversion is performed on all full-disk HMI observations. The disambiguation, until recently run only on HARP regions, is now implemented for the full disk. Vector and scalar quantities in the patches are used to derive active region indices potentially useful for forecasting; the data maps and indices are collected in the SHARP data series, hmi.sharp_720s. Definitive SHARP processing is completed only after the region rotates off the visible disk; quick-look products are produced in near real time. Patches are provided in both CCD and heliographic coordinates. HMI provides continuous coverage of the vector field, but has modest spatial, spectral, and temporal resolution. Coupled with limitations of the analysis and interpretation techniques, effects of the orbital velocity, and instrument performance, the resulting measurements have a certain dynamic range and sensitivity and are subject to systematic errors and uncertainties that are characterized in this report. 相似文献
954.
An accessible model for interstellar OH/H2O maser associations is presented. It can be classified into radiative pumping model. It can close the dynamical cycle of H2O and OH species, and can give an interpretation on interstellar OH/H2O associations. A reasonable scheme for both regeneration and destruction of interstellar H2O and OH molecules is argued. Our model has overcome the defects of former radiative models, and is compatible with astronomical conditions. It is shown that the rotational population of H2O and OH in these regions is much less affected by collisions than by radiation. Some experiments have confirmed our proposal. 相似文献
955.
B. Peng J. M. Sun H. Y. Zhang T. Y. Piao J. Q. Li L. Lei T. Luo D. H. Li Y. J. Zheng R. NAN 《Experimental Astronomy》2004,17(1-3):423-430
Radio frequency interference (RFI) test observations were carried out at one of the candidate Square Kilometre Array (SKA) sites in Guizhou province, following the “RFI Measurement Protocol for Candidate SKA Sites” (hereafter RFI protocol). All data (raw and calibrated) are preserved in some suitable format, such as that set by the international RFI working group of the Site Evaluation and Selection Committee (SESC). An RFI test in December 2003 was performed according to Mode 1 of the RFI Protocol, in order to identify technical difficulties which might arise during a co-ordinated RFI measurement campaign over a period of 1 year. In this paper we describe the current equipment, observational technique and data presentation. The preliminary results demonstrate that the RFI situation at Dawodang depression in Guizhou province makes it quite a promising location for the proposed SKA. Furthermore, the first session of the RFI monitoring program, which was made in May 2004, showed that a complete RFI measurement including both modes 1 and 2 of the RFI Protocol would take about 2 weeks. The possible ways to minimize some limitations of the current equipment are also discussed, which will enable us to meet the RFI protocol. 相似文献
956.
LIU Lingyun GUO Haiyan SUN Qi 《中国海洋大学学报(英文版)》2006,5(3):269-272
Portal water injection sheet pile (PWISP), as a retaining wall, appeared in seashore engineering in 2000. Although there have been many systematic methods addressing the issue, there are very few focusing on the new structure because of the difficulties in defining the earth pressure between the two piles. A new method is proposed in this paper to obtain the earth pressure between the PWISPs. Stability analysis against overturning follows as a consequence. Using Finite Element Analysis (FEA) software ANSYS, both the nonlinear characteristics of the soil and those of the contact elements are taken into account to obtain the earth pressure distribution on the contact surface. Based on the results of the FEA, Rankin's theory and the slip plane theory, the formula of the earth pressure on the inner surfaces between the piles is given. Assuming the PWISP as the analysis object and the earth pressure as an outside force acting upon it, the equation of stability against overturning of the PWISP is presented. Finally, some parameters are discussed about the stability of the PWISP against overturning, such as the embedded depth of the front pile, the distance between the two rows of piles, the internal friction angle and the cohesion of the earth. The results show that the increase of the cohesion and the internal friction angle will decrease the distance and the embedded depth, and therefore enhance the stability against overturning. Specifically, when the distance is 1/3-2/3 of the maximal excavation depth, the two rows of piles give the best performance in stability. 相似文献
957.
Elena B Volynets Svetlana A Schorokhova Ge Sun 《东北亚地学研究》2006,9(1):1-12
IntroductionThe Late Triassic strata andflora developed andwell outcropped in southern Pri morye,Russia.Thestrata are marine and non-marine alternate for eachother and yield abundant mollusk and plant fossilsinwhich the Late Triassic Mongugai flora is well-known in the world.Kryshtofovich(1910,1921,1924)and Kryshtofovich&Prynada(1932)studiedthis florainthe earlier ti me,and consequently,Sre-brodolyskaja(1958,1961,1968),Schorokhova(1975,1977,1997,2004)and Krassilov&Schorokhova(1970,1975)ma… 相似文献
958.
本文介绍了岩石地层单位的基本概念,今后新创或修订岩石地层单位应提供的资料和说明,并以多索曲组的创建为例,对有关基本要求进一步予以说明。 相似文献
959.
STUDY ON SPATIAL AUTOCORRELATION OF URBAN LAND PRICE DISTRIBUTION IN CHANGZHOU CITY OF JIANGSU PROVINCE 总被引:2,自引:0,他引:2
LIU Zhong-gang LI Man-chun SUN Yan MA Wen-bo 《中国地理科学(英文版)》2006,16(2):160-164
1INTRODUCTION The level and periodic changes of land price are interest- ing subjects for the governors, investors, researchers and grass-roots. Currently, the higher land price in China has become the focus among the people, from central go- vernment tocommon citizens,especially in theChang- jiang (Yangtze) River Delta area around Shanghai City. So that studyingthisproblem have both an academic and practicalmeaning. One characteristic ofland is fixed location (the others are high cost… 相似文献
960.
城市规划信息系统作为城市地理信息系统的一个重要的专题分支系统 ,是城市规划体系的基础和纽带。因此 ,通过研究城市规划信息系统的基础理论来指导城市规划信息系统的具体实践 ,进而实现城市可持续发展的战略 ,具有重要意义。 相似文献