新近系谢家阶层型剖面古地磁年代学研究   总被引：9，自引：1，他引：9  

武力超  岳乐平  王建其  F.Heller  邓涛 《地层学杂志》2006,30(1):50-53

古地磁测量表明,中国新近系谢家阶界线层型剖面——西宁盆地谢家剖面共记录了18个正极性段与17个负极性段,与标准极性柱中C5Bn.2n—C7n.1n之间的极性带能很好的对应。剖面中谢家组的年龄为17.32—21.58Ma,谢家哺乳动物群的年龄约为21Ma,相当于MN2中期。  相似文献   

明矾石矿石单矿物分离提纯     

邓涛  张慧敏 《江苏地质》1990,(2):57-58

本文对明矾石矿中叶蜡石、硬水铝石、明矾石三种矿物采用不同的物理及化学方法进行了试验性的分离提纯。  相似文献   

京珠国道GPS控制测量     

邓涛  陈锦潮 《测绘科技通讯》1996,19(4):6-9

困难地区建立大规模的高等级公路整体基础控制网是公路工程设计与建设中的难点。我院于９４－９５年期间采用ＧＰＳ卫星定位和常规ＥＤＭ测量技术完成了京球国道南段５０ｋｍ路线长的基础控制测量，这种大规模的ＧＰＳ技术应用初中在我国公路建设史上尚属首次。  相似文献   

重论真马(Equus属)首次出现可作为第四纪下限的标志   总被引：1，自引：0，他引：1  

邓涛  薛祥煦 《地层学杂志》1997,(2)

真马（Ｅｑｕｕｓ属）首次出现曾被作为第四纪下限标志，近年来不断受到怀疑、甚至否定。然而，根据目前公认的２．５ＭａＢ．Ｐ．的第四纪下限，则真马在欧亚大陆的首次出现正与此界线吻合，从欧洲维拉方动物群、中国北方泥河湾地层、南方元谋盆地，以及其他剖面得到的证据都证明了这一点。真马首次出现事件与２．５ＭａＢ．Ｐ．的许多重大地质事件同时，如古地磁高斯期与松山期界线，中国黄土开始堆积、北极冰盖出现、新构造运动第一次强化等。真马首次出现于２．５ＭａＢ．Ｐ．是由于北极冰盖出现所伴随的海平面下降，导致白令海峡露出水面，欧亚大陆和北美大陆得以连通，在北美起源并在进化上取得成功的真马迅速扩散至欧亚大陆等地。因此，真马首次出现可以作为这些地区第四纪下限的一个显著标志，尤其是在欧亚大陆。  相似文献   

Retrieval of Boundary Layer Height and Its Influence on PM 2.5 Concentration Based on Lidar Observation over Guangzhou     

宋烺  邓涛  李振宁  吴晟  何国文  李菲  吴蒙  吴兑 《热带气象学报(英文版)》2021,27(3):303-318

Wavelet analysis was applied to lidar observations to retrieve the planetary boundary layer height(PBLH)over Guangzhou from September 2013 to November 2014 over Guangzhou. Impact of the boundary effect and the wavelet scale factor on the accuracy of the retrieved PBLH has been explored thoroughly. In addition, the PBLH diurnal variations and the relationship between PM_(2.5) concentration and PBLH during polluted and clean episodes were studied. Results indicate that the most steady retrieved PBLH can be obtained when scale factor is chosen between 300-390 m. The retrieved maximum and minimum PBLH in the annual mean diurnal cycle were ～1100 m and ～650 m, respectively. The PBLH was significantly lower in the dry season than in the wet season, with the average highest PBLH in the dry season and the wet season being ～1050 m and ～1200 m respectively. Compared to the wet season, the development of PBLH in the dry season was delayed by at least one hour due to the seasonal cycle of solar radiation. Episode analysis indicated that the PBLH was ～50% higher during clean episodes than during haze episodes. The average highest PBLH in the haze episodes and clean episodes were ～800 m and ～1300 m,respectively. A significant negative correlation between PBLH and PM_(2.5) concentration(r =-0.55**) is discovered.According to China"Ambient Air Quality Standard", the PBLH values in good and slightly polluted conditions were 1/6-1/3 lower than that in excellent conditions, while the corresponding PM_(2.5) concentration were ～2-2.5 times higher.  相似文献   

华南区域大气成分业务数值预报GRACEs模式系统   总被引：1，自引：0，他引：1  

邓雪娇  邓涛  麦博儒  殷长秦  王楠  李菲  邹宇  谭浩波  吴兑 《热带气象学报》2016,(6):900-907

总结了华南区域大气成分数值预报GRACEs模式系统的业务发展进程,系统介绍了GRACEs模式的计算域、气象驱动场、输入排放源、计算平台与产品应用,报告了GRACEs模式的业务预报性能。概述了国内外大气成分数值预报模式的发展现状与趋势,介绍了新版CMAQ模式Ver5.1的化学机理,及其在光化学、气溶胶化学、源排放、化学与气象双向反馈机制等方面的重要更新。GRACEs模式系统预期将在本地精细化气象模式、污染源本地化、化学机理以及初始场同化等方面进一步研究,深入开展华南区域"一体化"大气成分模式系统的研发与应用。  相似文献   

MEASUREMENTS OF PARTICLE NUMBER SIZE DISTRIBUTIONS AND NEW PARTICLE FORMATION EVENTS DURING WINTER IN THE PEARL RIVER DELTA REGION, CHINA     

谭浩波  银燕  李菲  刘显通  陈柏纬  邓涛  邓雪娇  万齐林  吴兑 《热带气象学报(英文版)》2016,22(2):191-199

Particle number size distribution(PNSD) between 10 nm and 20 μm were measured in the Pearl River Delta(PRD) region in winter 2011.The average particle number concentration of the nucleation mode(10-20 nm),Aitken mode(20-100 nm),accumulation mode(100 nm-1μm) and coarse mode(1-20 μm) particles were 1 552,7 470,4 012,and 19 cm-3,respectively.The volume concentration of accumulation mode particles with peak at 300 nm accounted for over 70% of the total volume concentration.Diurnal variations and dependencies on meteorological parameters of PNSD were investigated.The diurnal variation of nucleation mode particles was mainly influenced by new particle formation events,while the diurnal variation of Aitken mode particles correlated to the traffic emission and the growth process of nucleation mode particles.When the PRD region was controlled by a cold high pressure,conditions of low relative humidity,high wind speed and strong radiation are favorable for the occurrence of new particle formation(NPF) events.The frequency of occurrence of NPF events was 21.3% during the whole measurement period.Parameters describing NPF events,including growth rate(GR) and source rate of condensable vapor(Q),were slightly larger than those in previous literature.This suggests that intense photochemical and biological activities may be the source of condensable vapor for particle growth,even during winter in the PRD.  相似文献   

煤系硬质高岭土的漂白处理     

邓涛 《江苏地质》1998,22(4):219-222

煤系硬质高岭土因有机质、铁、钛等有害成分的影响,原矿白度较低,应用范围受到限制。通过超细粉碎—除有机质—还原除铁—焙烧等工艺深加工处理后,可得到白度＞８０％、粒度＜１μｍ大于９０％的高岭土精粉,产品档次大为提高。  相似文献   

深厚软土中抗滑桩的修正悬臂桩计算方法     

邓涛  许杰  郑嘉勇  郑路 《岩土力学》2022,43(5):1299-1305

大面积堆填或开挖时深厚软土地层内部常产生较大滑移,这为该类地层中考虑桩土作用的抗滑桩分析带来较大困难。考虑深厚软土的滑移性状,针对既有悬臂桩法计算存在的问题进行修正,滑动面上部桩身受荷段的桩身荷载采用等腰三角形分布且极值点为极限侧土压力,设滑动面下部桩身锚固段上侧桩周软土为理想弹塑性以考虑软土大位移条件,下侧为弹性状态,并通过位移叠加原理对传统方法求解产生滑动面不连续的缺陷进行修正。通过现场桩侧堆载试验验证,修正悬臂桩法的弯矩和位移计算结果较好,桩顶位移误差小于3%,桩身最大弯矩误差小于10%。所提方法有助于深厚软土地层抗滑桩的设计和计算。  相似文献   

中国新近纪哺乳动物群的演化与青藏高原隆升的关系     

邓涛  王晓鸣  王世骐  李强  侯素宽 《地球科学进展》2015,30(4):407-415

新近纪哺乳动物的起源、辐射、扩散、绝灭等方面反映了气候环境的重大变化,晚新生代青藏高原的形成对东亚地区哺乳动物的演化具有直接而深远的影响。高原的隆升使自然环境发生改变,环境的变化又导致动物组成和分布的分异,以及动物对环境适应性的调整。中国新近纪哺乳动物化石研究的结果不仅表明哺乳动物群的组成和特征具有明显的区域性差异,而且中国还是一些代表性门类的起源扩散中心,也是哺乳动物洲际迁徙的关键通道。青藏高原新近纪晚期的哺乳动物群具有非常重要的意义,因为在随之而来的第四纪冰期中这些寒冷适应性动物获得了优势地位,由此成为现代动物地理区系和多样性的基础。通过以点带面的综合研究,将能够全面地认识新近纪动物地理区系对重大气候事件的响应,更准确地判断青藏高原隆升对陆地生态系统的影响。  相似文献