底部框剪-组合墙多层房屋抗震变形分析

研究了底部框剪多层砖房在地震作用下的弹塑性变形状态,研究了框剪层与相邻砌体结构层的层间侧移刚度比对层间变形的影响。     

Silicon limitation on primary production and its destiny in Jiaozhou Bay, China——Ⅶ： The complementary mechanism of the earth ecosystem

1 INTRODUCTION In marine waters, water temperature and nutrient Si control the temporal and spatial variation of the phytoplankton growth (Yang et al., 2006). The effect of nutrient Si and water temperature on the mecha- nism of phytoplankton growth has p…     

大跨径桥梁悬臂施工挠度监测

挠度测量是箱梁悬臂施工控制的一项重要内容,目的是为施工提供每一个箱梁阶段准确的立模标高,为保持桥梁线形和顺利合龙打下基础,但挠度测量的影响因素比较复杂。从挠度测量的方法、测控点的埋设、影响因素、外业采集的数据等方面进行了分析。     

东天山阿齐山地区石炭纪汇宇岛弧花岗岩的厘定及意义

笔者在参加新疆东天山阿齐山一带1∶5万区域地质矿产调查工作中,通过对北天山岛弧区侵入岩的岩石学、岩石化学、岩石地球化学、同位素等的调查与研究,依据同源岩浆演化系列,将北天山岛弧区构造—岩浆岩带划分为主期中—酸性花岗岩和补充期钾质花岗岩两个大的岩浆演化阶段。其中,在北天山岛弧区原划三叠纪汇宇板内花岗岩获得中粒钾长花岗岩锆石U-Pb法313.8±0.8~351.3±0.9 Ma同位素测年值,据此将其侵入时代厘定为石炭纪,并通过岩石地球化学研究,认为其具离散式分布、属“S”型壳源花岗岩,具反序列成分演化,主要为岩浆结晶分异形成,属岛弧花岗岩的补充期侵入体。     

SPATIO-TEMPORAL VARIATION OF ACTUAL EVAPOTRANSPIRATION AND ITS RELATION WITH CLIMATE PARAMETERS IN THE PEARL RIVER BASIN, CHINA

Spatio-temporal variation of actual evapotranspiration (ETa) in the Pearl River basin from 1961 to 2010 are analyzed based on daily data from 60 national observed stations. ETa is calculated by the Advection-Aridity model (AA model) in the current study, and Mann–Kendall test (MK) and Inverse Distance Weighted interpolation method (IDW) were applied to detect the trends and spatial variation pattern. The relations of ETa with climate parameters and radiation / dynamic terms are analyzed by Person correlation method. Our findings are shown as follows: 1) Mean annual ETa in the Pearl River basin is about 665.6 mm/a. It has significantly decreased in 1961–2010 at a rate of -24.3 mm/10a. Seasonally, negative trends of summer and autumn ETa are higher than that of spring and winter. 2) The value of ETa is higher in the southeast coastal area than in the northwest region of the Pearl River basin, while the latter has shown the strongest negative trend. 3) Negative trends of ETa in the Pearl River basin are most probably due to decreasing radiation term and increasing dynamic term. The decrease of the radiation term is related with declining diurnal temperature range and sunshine duration, and rising atmospheric pressure as well. The contribution of dynamic term comes from increasing average temperature, maximum and minimum temperatures in the basin. Meanwhile, the decreasing average wind speed weakens dynamic term and finally, to a certain extent, it slows down the negative trend of the ETa.     

LZ-73型连续造斜器在兰陵铁矿勘查中的应用

LZ系列连续造斜器作为一种定向造斜的工具,广泛应用于石油领域。而在小口径固体矿产钻探,则缺乏相应的成熟技术,一直未能较大范围的推广。针对兰陵铁矿矿区的地层情况与其造成钻孔普遍偏斜的原因,结合矿区连续造斜器的应用,介绍了LZ-75型连续造斜器的工作原理和2种定向方法,以及一些使用心得。     

中国夏季降水预测的能量互补模型

统计结果表明,冬季最大能量特征线(副热带高空西风急流轴)与夏季最小能量特征线(副高脊线)在长江流域上空9-15 km近于重合,冬季高空西风急流轴位于夏季西太平洋副高588线的西北侧,即平均雨带附近。据此,可预测夏季主雨带。经1997-2005年实时预报,主雨带均无漏报。     

联合多代卫星测高数据建立高分辨率浙江近海垂线偏差模型

联合多代卫星测高数据,研究共线平均理论,在时域上削弱测高数据短波误差影响。基于EGM2008重力场模型及DTU10海面地形模型,采用沿轨迹加权最小二乘方法,确定浙江近海2.5′×2.5′分辨率格网点垂线偏差子午分量ξ和卯酉分量η,将所得计算结果与EGM96、EGM2008、ITG-Grace2010s模型值进行比较。结果表明:浙江近海垂线偏差模型与EGM2008模型的精度较为相近,在子午圈及卯酉圈上的RMS分别为±0.15320″、±0.63061″。     

船舶监控系统中航迹线动态绘制算法应用研究

船舶监控系统中实现了船只航迹线的动态绘制,发过程中涉及到偏转角度算法和距离插值两个核心算法,视化表现方面取得了良好的效果。系统能够根据船只航行方向动态显示航行轨迹,程序开系统开发实践表明,这两个算法的合理应用在航迹线可     

Dynamic Scaling of the Generalized Complementary Relationship Improves Long-term Tendency Estimates in Land Evaporation

Most large-scale evapotranspiration(ET) estimation methods require detailed information of land use, land cover,and/or soil type on top of various atmospheric measurements. The complementary relationship of evaporation(CR) takes advantage of the inherent dynamic feedback mechanisms found in the soil-vegetation-atmosphere interface for its estimation of ET rates without the need of such biogeophysical data. ET estimates over the conterminous United States by a new, globally calibrated, static sca...