江苏江都市大桥镇晚更新世晚期—全新世有孔虫动物群的发现及其地质意义     

韦一  韩芳  魏乃颐  于庆文  张智勇  张克信 《地质科技情报》2011,30(3):41-47

在江苏省江都市ZKA4钻孔孔深4.0～42.6 m岩心段中发现有孔虫化石,鉴定识别出有孔虫38属56种,其中9个未定种,根据有孔虫动物群在钻孔剖面上的分布规律,建立了 3个有孔虫化石组合,自上而下为:Ammonia beccarii Linne)vars.-Orbulina universa组合,Ammonia bec...  相似文献   

鄱阳湖沉积物粒度特征及其对形成演变过程的示踪意义   总被引：4，自引：0，他引：4  

董延钰  金芳  黄俊华 《地质科技情报》2011,30(2):57-62

通过对鄱阳湖大汉湖ZK04钻孔沉积物的粒度分析,揭示了该地区沉积物粒度特征.结果表明,从湖滨到湖心沉积物粒度呈由砾石→粗砂→细砂→粉砂→黏土等逐渐变细的正旋回,其沉积时代可分为6个阶段:第1阶段(601～530 cm),M、KG、SD、SK都为曲线中最高峰,频率为4峰型,该阶段气候暖湿,彭蠡泽形成;第2阶段(530～3...  相似文献   

周期性弱凝胶调驱技术及应用     

齐陆宁  杨少春  刘芳  时丕同 《新疆地质》2011,29(3):352-355

通过室内物理模拟实验,研究平面模型中周期性注入弱凝胶效果和提高采收率机理.研究证明,弱凝胶调驱可大幅改善水驱油藏平面和纵向上的非均质性,提高水驱波及系数.周期性注入凝胶段塞能取得调剖作用和驱替效果,前段弱凝胶、中间水和后续弱凝胶可组成一个有机灵活整体,使水驱效率大幅提高,可维持调驱效果长效性.在试验基础上,针对埕岛油田北区CB6B块非均质突出,水驱矛盾突出问题,现场实施周期性弱凝胶调驱.实施后注入剖面得到明显改善,含水下降,累增油量2.05×104 t,提高采油速度0.3%.  相似文献   

Consistent Modelling of Expansive and Collapsive Response of Unsaturated Soils     

X. S. Li  X. W. Fang 《Geotechnical and Geological Engineering》2011,29(2):203-216

In unsaturated soil modelling, collapse is viewed as an ordinary response, whereas swelling upon an increase of moisture is considered as a special class of problems. However, an investigation based on fundamentals of plasticity indicates that the two seemingly opposite responses are unified within the same ordinary elastoplasticity framework. In fact, similar to the well-known contractive and dilative responses in the critical state framework, the collapsive and expansive responses of unsaturated soils differ only in the sign of the dissipative hydrostatic stress. For a soil with a low applied net stress, the dissipative mean normal stress during wetting is likely to be negative, and the plastic volumetric strain is kept negative (swelling) as well, such that the dissipation is always positive, complying with the second law of thermodynamics. When the applied net stress is high, the dissipative mean normal stress may turn to be positive, resulting in a positive plastic volumetric strain (collapse). This paper explains the concept of this ‘ordinary’ modelling framework, and uses a bounding surface triaxial model to demonstrate the concept. The numerical results are compared with experimental observations reported in the literature.  相似文献   

Formula of incipient velocity for flooded vehicles   总被引：3，自引：3，他引：0  

Junqiang Xia  Fang Yenn Teo  Binliang Lin  Roger A. Falconer 《Natural Hazards》2011,58(1):1-14

With the climate change caused by global warming, the occurrence probability of urban flooding due to flash floods has increased gradually. Flush floods propagate rapidly, which can lead to significant hazard to human life and property. Flood hazard to vehicles has become more noticeable and frequent in recent years. Therefore, it is important to investigate the behaviour of vehicles on flooded streets or roads. In the current study, a formula has been derived to predict the incipient velocity of flooded vehicles according to the mechanical condition of sliding equilibrium. A series of flume experiments were conducted using three types of scaled die-cast model vehicles, with two scales being tested for each type of vehicle. The experimental data obtained for the small-scale model vehicles were used to determine the two parameters in the derived formula, and the prediction accuracy of this formula was validated using the experimental data obtained for the large-scale model vehicles. Finally, the corresponding incipient velocities under various incoming depths were computed using this formula for these three prototype vehicles. It is found that for a specified vehicle, the value of incipient velocity reaches its minimum as the incoming flow depth approaches the height of the vehicle, and the smaller and lighter vehicle like Mini Cooper is the easiest to start sliding in floodwaters. The results can be used as a preliminary assessment to define the hazard to vehicles parking on flooded streets or roads.  相似文献   

2010上海世博会上欧泊营销的启示     

余芳  包德清 《地质科学译丛》2011,(1):43-46

欧泊是一种具有特殊光学效应的宝石,其变幻莫测的色彩令人着迷。但在国内珠宝市场上欧泊的销售份额很小,有关其有效营销方法研究方面的参考资料基本处于空白状态。借助2010年上海世博会的契机,结合笔者在澳大利亚馆销售欧泊产品4个月的经历,着重从多角度吸引顾客、留住顾客、销售攻心术、灵活引导及创新推广活动等方面分析了澳大利亚AODC公司的营销策略,从中总结出几点建议,旨在对国内珠宝营销有所启发。  相似文献   

甘肃省临夏盆地更新世早期湖泊沉积孢粉记录的古气候演化          下载免费PDF全文

董铭  方小敏  史正涛  明庆忠  苏怀 《第四纪研究》2011,31(1):104-111

根据孢粉组合特征,将临夏盆地早更新统东山组(2.50-1.76Ma)的孢粉划分为3个孢粉带(含6个亚带),即3个植被、气候阶段,第一阶段(2.50-1.91Ma,带Ⅰ),植被类型是以柏科、榆属和禾本科为优势种的温带森林,气候表现为温凉稍干,并有逐渐干旱化的趋势.第二阶段(1.91-1.80Ma,带Ⅱ)是以云杉属、榆属和...  相似文献   

中国进出口贸易碳转移排放测算方法分析与评价     

方修琦  王媛  魏本勇  王文琴 《地球科学进展》2011,26(10):1101-1108

目前中国的碳转移排放测算方法有很多,虽然方法不尽相同,但总的结论和计算出的变化趋势类似。造成碳转移量测算结果产生较大差异的原因主要有两方面,一是碳排放强度的测算模型不同,二是对于中国加工贸易转移碳排放的认识不同。测算避免转移排放量时,如果不考虑加工贸易的影响,在某些年份（如2002年）甚至会得到＂中国是碳转移的净进口国...  相似文献   

Numerical study on the bifurcation of the North Equatorial Current     

Yulong Liu  Qi Wang  Jun Song  Xiande Zhu  Xiaoqing Gong  Fang Wu 《中国海洋大学学报(英文版)》2011,10(4):305-313

A 1.5-layer reduced-gravity model forced by wind stress is used to study the bifurcations of the North Equatorial Current(NEC).The authors found that after removing the Ekman drift,the modelled circulations can serve well as a proxy of the SODA circulations on the σθ=25.0 kg m～-3 potential density surface based on available long-term reanalysis wind stress data.The modelled results show that the location of the western boundary bifurcation of the NEC depends on both zonal averaged and local zero wind stress curl latitude.The effects of the anomalous wind stress curl added in different areas are also investigated and it is found that they can change the strength of the Mindanao Eddy(ME),and then influence the interior pathway.  相似文献   

太阳活动低年南北极电离层F2层观测与国际参考电离层对比研究          下载免费PDF全文

何昉  张北辰 《极地研究》2011,23(3):159-167

利用2006-2007年EISCAT Svalbard雷达(ESR)和南极中山站DPS-4测高仪的观测数据,对太阳活动低年不同季节的极区电离层F2层临界频率(f0F2)和峰值高度(hmF2)进行统计分析,研究其日变化特征,并与国际参考电离层IRI-2007模式比较.结果表明,在太阳活动低年,夏季两站的观测结果与IRI预...  相似文献