楼板隔震消能结构的振动台试验研究     

冼巧玲  刘建安  周福霖 《地震工程与工程振动》2008,28(3):145-151

用同一个单层钢框架结构模型,分别做成传统结构体系和楼板隔震消能结构体系。模型在每一种结构体系下分别做模拟地震振动台试验,先后在x向按7度小震和大震烈度输入E l Centro波、Taft波和天津波,比较单层钢框架模型在两种结构体系下的地震反应。试验结果表明,采用楼板隔震消能结构体系能够显著减小结构的加速度反应和底部剪力反应。  相似文献   

盘锦Ⅰ号井的气氡与水氡观测     

王亚男  刘建光  张维东  董艳涛  鲜述东 《东北地震研究》2008,24(3):40-45

本文对盘Ⅰ井数字化气氡和模拟水氡观测进行了讨论,分析了盘Ⅰ井数字化气氡和模拟水氡在测量原理、方法、计量单位和干扰因素等方面存在的差异,认为两者不能互相取代。  相似文献   

盘一井气氡新型脱气装置应用实验研究     

刘丽  刘爽  刘建光  鲜述东  韩艳  杨昆 《防灾减灾学报》2019,35(1):36-40

在盘一井数字化气氡观测过程中,脱气装置经过两次改进,但出现的各种干扰因素无法得到有效解决,应用效果一般。为了减少脱气装置对气氡观测的干扰,提高观测数据质量,盘锦台改进制作了新型喷射负压式脱气装置,经过近7个月的试验研究,有效地减少脱气装置在气氡观测中的干扰,解决了氡观测脱气装置稳定性难题,这也进一步提高了气氡观测数据的内在质量。可为国内地震台站观测(水质矿化度高的观测井口)提供脱气装置制作、观测经验,具有一定的推广应用价值。  相似文献   

基于空时显著性的日冕物质抛射检测          下载免费PDF全文

杨志鹏  尚振宏  强振平  辛泽寰  冼祥贵  夏国强 《天文学报》2021,62(6):59

日冕物质抛射(Coronal Mass Ejection, CME)是一种剧烈的太阳爆发现象, 它会对行星际空间造成严重扰动, 进而影响人类生产、生活. 基于CME的时空显著性, 将显著性检测方法引入到CME检测中, 利用结构化矩阵分解SOHO (Solar and Heliospheric Observatory)的大角度光谱日冕仪(Large Angle and Spectrometric Coronagraph Experiment, LASCO) C2的日冕图像对应的特征矩阵, 从中恢复出稀疏部分获得显著前景. 然后考虑CME运动时产生的时间显著性, 从而去除非CME结构(如冕流), 得到最终检测结果. 实验表明, 以人工目录协调数据分析中心(Coordinated Data Analysis Workshop, CDAW)检测结果为基准时, 所提方法不仅在检测CME数量上比计算机辅助跟踪软件包(Computer Aided CME Tracking Software package, CACTus)和太阳爆发事件检测系统(Solar Eruptive Event Detection System, SEEDS)有优势, 还在CME中心角度和张角宽度等特征物理参数测量上比CACTus和SEEDS更接近CDAW目录参考值.  相似文献   

Two-step interface and velocity inversion—— Study o e of the Tangshan seismic region     

XIAO LING LAI XIAN KANG ZHANG XU YAO ZHENG Research Center of Exploration Geophysics  China Seismological Bureau  Zhengzhou  China 《地震学报(英文版)》1998,(6)

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Fengyun Meteorological Satellite Products for Earth System Science Applications     

Di XIAN  Peng ZHANG  Ling GAO  Ruijing SUN  Haizhen ZHANG  Xu JIA 《大气科学进展》2021,38(8):1267-1284

Following the progress of satellite data assimilation in the 1990s, the combination of meteorological satellites and numerical models has changed the way scientists understand the earth. With the evolution of numerical weather prediction models and earth system models, meteorological satellites will play a more important role in earth sciences in the future. As part of the space-based infrastructure, the Fengyun (FY) meteorological satellites have contributed to earth science sustainability studies through an open data policy and stable data quality since the first launch of the FY-1A satellite in 1988. The capability of earth system monitoring was greatly enhanced after the second-generation polar orbiting FY-3 satellites and geostationary orbiting FY-4 satellites were developed. Meanwhile, the quality of the products generated from the FY-3 and FY-4 satellites is comparable to the well-known MODIS products. FY satellite data has been utilized broadly in weather forecasting, climate and climate change investigations, environmental disaster monitoring, etc. This article reviews the instruments mounted on the FY satellites. Sensor-dependent level 1 products (radiance data) and inversion algorithm-dependent level 2 products (geophysical parameters) are introduced. As an example, some typical geophysical parameters, such as wildfires, lightning, vegetation indices, aerosol products, soil moisture, and precipitation estimation have been demonstrated and validated by in-situ observations and other well-known satellite products. To help users access the FY products, a set of data sharing systems has been developed and operated. The newly developed data sharing system based on cloud technology has been illustrated to improve the efficiency of data delivery.  相似文献   

Evaluation of All-Sky Assimilation of FY-3C/MWHS-2 on Mei-yuPrecipitation Forecasts over the Yangtze-Huaihe River Basin     

Yu LI  Keyi CHEN  Zhipeng XIAN 《大气科学进展》2021,38(8):1397-1414

正1School of Atmospheric Sciences, Chengdu University of Information Technology, Chengdu 610025, China2International Center for Climate and Environment Sciences, Institute of Atmospheric Physics,Chinese Academy of Sciences, Beijing 100029, China3University of Chinese Academy of Sciences, Beijing 100049, China  相似文献   

The Effect of Temperature on Growth and Energy Budget of the Polychaete,Neanthesjaponica Izuka     

LIU Yong  XIAN Weiwei 《青岛海洋大学学报(英文版)》2009,(2):177-183

Growth and energy budget of the polychaete, Neanthesjaponica, at various temperatures （17, 20, 23, 26 and 29℃） were investigated in this study. The growth, as indicated by final dry weight and specific growth rate （SGR）, increased with increasing temperature, with the maximum level at 26℃, and then decreased significantly at 29℃. A similar trend was observed in feeding rate, food conversion efficiency （FCE） and apparent digestive rate （ADR）. However, no significant differences were detected in ADR among all the temperature treatments. In the pattern of energy allocation, faeces energy was only a small component of energy budget and had little influence on the proportion of food energy allocated to growth. The metabolic energy accounted for a large portion of energy intake for each temperature treatment. The nitrogen excretion was appreciable with changing temperature. The two expenditure terms （respiration energy and excretion energy） in energy budget were the major factors influencing the proportion of food energy allocated to growth. These results revealed that temperature affected the growth of N. japonica mainly by influencing feeding rate and FCE. In addition, regression equations describing the relationship between feeding rate, faecal production, SGR, FCE and temperature were obtained. The optimum temperatures for feeding rate, FCE and SGR were estimated at 25.01 ℃, 24.24℃ and 24.73 ℃, respectively, from the regression equations.  相似文献   

Postglacial changes in the Asian summer monsoon system: a pollen record from the eastern margin of the Tibetan Plateau     

WEIJIAN ZHOU  SHI‐YONG YU  GEORGE S. BURR  GEORGE J. KUKLA  A. J. T. JULL  FENG XIAN  JIAYI XIAO  STEVEN M. COLMAN  HUAGUI YU  ZHAO LIU  XIANGHUI KONG 《Boreas: An International Journal of Quaternary Research》2010,39(3):528-539

Zhou, W., Yu, S.‐Y., Burr, G. S., Kukla, G. J., Jull, A. J. T., Xian, F., Xiao, J., Colman, S. M., Yu, H., Liu, Z. & Kong, X. 2010: Postglacial changes in the Asian summer monsoon system: a pollen record from the eastern margin of the Tibetan Plateau. Boreas, Vol. 39, pp. 528–539. 10.1111/j.1502‐3885.2010.00150.x. ISSN 0300‐9483. A new pollen record constrained by 32 AMS radiocarbon dates from the Hongyuan peatland in the Zoige Basin reveals the long‐term dynamics of an alpine wetland ecosystem on the eastern margin of the Tibetan Plateau over the last 13 500 years. Changes in pollen assemblages and influxes suggest that local vegetation has experienced three distinct stages, from alpine coniferous forest–meadow (13 500–11 500 cal. a BP), through alpine coniferous forest (11 500–3000 cal. a BP), back to alpine coniferous forest–meadow (3000 cal. a BP–present). This record reflects an ecosystem response along a transition zone where the South Asian and East Asian monsoon systems may have had different palaeoclimatic influences. A comparison of this record with other pollen records across the Tibetan Plateau shows common features with regard to large‐scale Holocene climatic changes, but highlights a pattern of regional temporal and spatial variability that depends on the topography and position relative to the South Asian and East Asian monsoon fronts.  相似文献   

3维景观快速建模技术研究     

咸桂玉  梁立恒  钱美兰  姜红艳 《测绘与空间地理信息》2009,32(3):154-156

地表3维景观几何对象经过模型化后,都存储在计算机中,只有将其模型进行可视化,才能看到虚拟模型化后的地物景观.本文主要讨论了利用Creator,采用纹理和贴图技术、LOD模型、动态多分辨率的纹理与影像优化技术,提高3维模型的表达,加强可视化效果.  相似文献