地震设防水准对典型框架土建成本的影响   总被引：1，自引：0，他引：1  

韩淼  刘健兵  高孟潭 《震灾防御技术》2009,4(2):209-214

本文对按不同地震设防烈度设计的6层典型框架结构,计算了在不同地震设防烈度下的土建成本。对比分析结果表明,在地震设防烈度8度以下,如果将地震设防水准提高一个等级,相应的土建成本增加比例小于5．9％,而所增加的成本占房屋售价的比例小于0.3％。由此,在框架结构土建成本有较小增加的情况下,可获得地震设防水准1个等级的提高。换一个角度讲,在减少建筑面积很小的情况下,可获得房屋抗震设防水准1个等级的提高。  相似文献   

四川龙门山构造带构造样式浅析     

李娟  李忠权  王平 《云南地质》2012,(2):272-276

总结前人研究成果,综合野外实地地质调查、室内剖面制作,实例验证龙门山构造带构造样式、组合特征,提出有益见解。  相似文献   

近千年来三个气候特征时期东亚夏季风的模拟对比     

况雪源  刘健  林惠娟  王红丽  提汝媛 《地球科学进展》2010,25(10):1082-1090

利用全球海气耦合气候模式ECHO-G的近千年连续积分资料,选取与降水关系较好的东亚夏季风指数,对不同气候特征时期的东亚环流及季风影响因子进行了探讨.结果表明用海陆热力差异定义的东亚夏季风指数Isun在年际尺度上较好地体现了长江流域及华北地区降水的变化,而利用850 hPa纬向风场定义的指数Iwang在年代际尺度上较好地体现了长江流域的降水变化.从不同气候特征时期的环流来看,中世纪暖期夏季风最强,东亚大陆降水明显偏多,现代暖期夏季风较之有所减弱,而小冰期则是夏季风最弱的时期,东亚大陆的降水明显偏少.不同气候特征时期夏季风指数与海温的相关表明,ENSO事件对东亚夏季风的影响在现代暖期有所增强,而与外部强迫因子的相关揭示出中世纪暖期有效太阳辐射变化是影响东亚夏季风变化的主要因子,现代暖期则是温室气体对夏季风的影响更重要.  相似文献   

Study on Typical Characteristics of Short-Term Precursors in Underground Fluid     

Liu Yaowei 《中国地震研究》2005,19(2):170-180

INTRODUCTION Existingresearchresultsindicatethattherearecloserelationsbetweenundergroundfluidandseismicactivity,especiallyintheshort termanomaliesofearthquakes.Anomalyinthefluidisobvious andthequantityislarge.Duringearthquakepreparation,thedrivingforcemec…  相似文献   

Dynamic influence of Holocene characteristics on vadose water in typical region of central North China Plain     

ZHANG Wei  SHI Jian-sheng  XU Jian-ming  LIU Ji-chao  DONG Qiu-yao  FAN Shu-xian 《地下水科学与工程》2016,4(3):247-258

In the typical region of central North China Plain, vadose sediments are Holocene sediment strata. With samples from field drillings, the study analyzes the sedimentary characteristics of vadose zone. The study takes the content of silty sand as the basis for sedimentary environment analysis, and the content of clay and sand as the sensitive indicator for sedimentary characteristics. Combining palynology analysis, the study divides vadose zone from top to bottom into diluvia oxbow lacustrine sediments, lacustrine sediments, lacustrine and swamp sediments, weak palaeohydrodynamic lacustrine sediments and alluvial sediments. Based on the sedimentary characteristics of Holocene strata, it analyzes the changes across depth of vadose zone water potential and matrix potential, obtaining the influence of vadose zone sedimentary characteristics on the migration of water in typical region of central North China Plain.  相似文献   

广南-富宁地区金成矿带典型矿床及地质特征   总被引：3，自引：0，他引：3  

王臣兴 《云南地质》2008,27(3):293-301

广南-富宁区是滇东南金矿主要分布区,为滇黔桂‘金三角’一隅,具有良好的成矿地质条件及成矿背景。研究典型矿床,了解、查明广富区金矿成矿特征和控矿特征,为进一步开展金矿找矿工作指明方向。  相似文献   

基于统计学的中国典型大城市CO2排放达峰研究     

蒋含颖  段祎然  张哲  曹丽斌  徐少东  张立  蔡博峰 《气候变化研究进展》2021,17(2):131-139

对选取的36个中国典型大城市,分析2005—2019年直接CO₂排放与总CO₂排放特征,构建基于条件判断函数和Mann-Kendall趋势分析检验法的城市CO₂排放达峰判断模型,判断36个城市排放是否达峰,并对达峰城市特征和处于不同排放阶段的典例城市进行深入分析。结果表明,36个典型大城市中,昆明、深圳与武汉3个城市已达峰,8个城市处于平台期,其余25个城市综合来看尚未达峰。建议未达峰城市根据自身特点借鉴已达峰城市经验,调整产业结构与能源结构,降低碳排放强度,加强碳排放与经济增长的脱钩,尽早实现达峰。  相似文献   

新疆典型流域积雪遥感信息系统数据库的建立     

徐俊荣  马虹 《干旱区地理》1998,21(3):81-86

天山山区冬季积雪深厚,稳定积雪期较长,利用积雪遥感图象可以动态监测大面积的积雪变化,有效地调查大范围的积雪资源状况,积雪遥感监测和积雪遥感制图涉及多方面的资料,积雪数据库是积雪遥感监测系统必不可少的一部分。本文就新疆典型流域积雪遥感信息系统数据库的建立,数据库之间的数据格式转换,接口,可视化界面等进行讨论。  相似文献   

单指标经纬仪水平度盘偏心差的典型相关分析     

童善群 《测绘学院学报》1989,(2)

本文运用典型相关分析的方法,对单指标经纬仪的多测回观测值进行分析,以发现其中是否含有水平度盘偏心差的影响。其结论与对仪器结构的几何分析是一致的。试验结果表明,该方法是一种有效的方法。  相似文献   

Impact of land-use change on soil properties in a typical karst agricultural region of Southwest China: a case study of Xiaojiang watershed, Yunnan   总被引：3，自引：0，他引：3  

Yong-Jun Jiang  Dao-Xian Yuan  Cheng Zhang  Ming-Sheng Kuang  Jian-Li Wang  Shi-You Xie  Lin-Li Li  Gui Zhang  Rao-Sheng He 《Environmental Geology》2006,50(6):911-918

Xiaojiang watershed is a typical karst agricultural region of Yunan Province, China. A case study of land-use changes documents changes of soil properties from 1982 to 2003. The results are as follows: (1) The total land use transformed covers 610.12 km², of which land use changed from unused land into cultivated land and forestland, and forestland into cultivated land during the past 20 years in Xiaojiang watershed. (2) The rapid growth of population and economic development were the main driving forces of cultivated land increase. (3) Soil properties showed modification owing to different land-use changes. The contents of the soil organic matter, total nitrogen, and total phosphorus in 2003 were significantly lower than that in 1982 after the forestland and unused land were transformed into the cultivated land, but the soil pH increased significantly in 2003. Organic matter, total nitrogen, and total phosphorus for shorter-time reforestation land declined, but the pH increased. Soil properties have improved significantly after cropland was transformed into orchard land. The organic matter, total nitrogen, total phosphorus, available nitrogen, and available phosphorus declined significantly, but pH increased significantly after rock desertification.  相似文献