温度和电子传递体AQDS对铁还原细菌Shewanella putrefaciens CN32矿化产物的影响

微生物矿化产生的超顺磁性(SP)磁铁矿是沉积物和土壤中磁性矿物的重要来源.本文比较了三个不同温度下(20℃,30℃,37℃)纯培养铁还原细菌Shewanella putre aciens CN32还原水合氧化铁形成SP磁铁矿的矿化特征.在实验体系中加入细菌CN32后,体系的氧化还原电位Eh迅速下降,酸碱度pH和亚铁离子...     

地震各向异性流体检测技术在胜利油田垦71井区的应用(英文)

根据Chapman理论模型,在各向异性介质(如HTI介质)中,当入射角在0-45。范围内,慢横波会发生较大的衰减和频散,且对流体粘度敏感,而P波和快横波则比较小。对于沿裂隙法向传播的慢横波,其振幅受流体影响很大。因此,在P波响应对流体不敏感的情况下,可利用慢横波来获得裂隙型油气藏的流体信息。本文分析了胜利油田垦71地区三维三分量地震数据,检测出的慢横波振幅和旅行时异常与该区的测井资料十分吻合。分析结果还发现,与含油区相比,含水区会产生更高的横波分裂。在含水区,慢横波振幅会产生明显变化,而在含油区则几乎没有变化。     

Influence of ground motion spatial variation,site condition and SSI on the required separation distances of bridge structures to avoid seismic pounding

It is commonly understood that earthquake ground excitations at multiple supports of large dimensional structures are not the same. These ground motion spatial variations may significantly influence the structural responses. Similarly, the interaction between the foundation and the surrounding soil during earthquake shaking also affects the dynamic response of the structure. Most previous studies on ground motion spatial variation effects on structural responses neglected soil–structure interaction (SSI) effect. This paper studies the combined effects of ground motion spatial variation, local site amplification and SSI on bridge responses, and estimates the required separation distances that modular expansion joints must provide to avoid seismic pounding. It is an extension of a previous study (Earthquake Engng Struct. Dyn. 2010; 39 (3):303–323), in which combined ground motion spatial variation and local site amplification effects on bridge responses were investigated. The present paper focuses on the simultaneous effect of SSI and ground motion spatial variation on structural responses. The soil surrounding the pile foundation is modelled by frequency‐dependent springs and dashpots in the horizontal and rotational directions. The peak structural responses are estimated by using the standard random vibration method. The minimum total gap between two adjacent bridge decks or between bridge deck and adjacent abutment to prevent seismic pounding is estimated. Numerical results show that SSI significantly affects the structural responses, and cannot be neglected. Copyright © 2010 John Wiley & Sons, Ltd.     

Petrographic, geochemical and geochronological investigation on granitic pebbles from Permotriassic metasediments of the Tisia terrain (eastern Papuk, Croatia)

Granitic pebbles occurring in the Permotriassic metasedimentary sequence of eastern Papuk, Slavonian Mountains, Croatia, were recognized to represent a coherent group of felsic, muscovite-albite metagranites. Fabrics, modal compositions and geochemical data imply that the rocks are derivatives of S-type granites formed through a combination of igneous and subsequent metasomatic processes. A Variscan formation age is demonstrated by K-Ar dating on coarse muscovite (range of 329?C317?Ma) as well as by electron microprobe based Th-U-Pb monazite dating (338?±?15?Ma). Additionally to the Variscan metasomatic processes of albitization and greisenisation, which led to an almost complete replacement of K-feldspar and biotite by albite and coarse muscovite, pebbles were affected by a younger phase of alteration resulting in the formation of a fine-grained sericitic matrix. The fine sericite yields K-Ar ages of 91?C83?Ma. A substantial reheating of the rocks during the Cretaceous is also indicated by the growth of new monazite dated at 106?±?10?Ma. Yttrium-contents of the Cretaceous monazite from the granite pebbles (0.3?C0.9?wt% Y₂O₃) are compatible with metamorphic temperatures of ~350?C400°C. These data confirm recent concepts according to which large parts of the Slavonian Mountains received a pervasive Cretaceous low-T regional metamorphic overprint. Furthermore, the pebbles provide useful information on the nature of the eroded Variscan crust of the Tisia Terrain, which has obviously contained considerable amounts of evolved high-level S-type granites modified through albitization and greisenization.     

路基工程中的砂土液化判别与治理

通过现场标准贯入试验,对国道317线K205+700～K207+100段路基填方段中的淤泥质粉细砂层进行了液化判别.<公路工程抗震设计规范>(JTJ004-89)和<建筑抗震设计规范>(GB5001-2001)的计算结果均表明该砂层会产生液化.但前一规范的计算值偏大,在工程中建议使用后一规范,并以振冲密实法进行预防.     

近岸海洋气象平台涡动相关数据处理与质量控制

涡动相关方法在海洋—大气界面通量过程的观测研究中得到广泛应用。通量观测的数据质量很大程度上取决于环境条件和订正方法的正确应用,因此需要对数据进行处理与质量控制。基于博贺海洋气象平台上方2层涡动相关系统约7个月的湍流观测数据,分析了目前未能在数据采集平台上实时运行的几种订正方法对通量结果的影响。分析表明：在通量值较小时,...     

与花岗质岩浆系统有关的石英脉型钨矿和斑岩型铜矿成矿流体特征比较

文中对比了与S型花岗岩有关的石英脉型钨矿和与I型（及少数A型）花岗岩类有关的斑岩型铜矿床的成矿流体特征。它们的共同点在于成矿流体都由岩浆流体演化而来,在后期逐渐有大气降水的加入。差异性在于：（1）石英脉型钨矿成矿流体主要属于中—中高温、中—中低盐度的NaCl-H2O±CO2体系,而斑岩型铜矿属于中高-高温、高盐度的Na...     

塔中台盆区原油正构烷烃摩尔浓度分布特征及意义

塔里木盆地塔中地区原油性质的多样性和复杂性十分罕见;分析表明,成熟作用和源岩相很可能是原油多样性的次要因素,主要影响因素可能与多期成藏或成藏后储层内的次生蚀变作用有关。本文对照正构烷烃摩尔浓度分布图版,辨别了塔中地区不同构造单元原油正构烷烃摩尔浓度的分布类型,分析了原油遭受次生蚀变作用的程度,以及蒸发分馏作用、气洗作用发生的原因及其对原油物性的影响。结果表明,由于运移通道以及与油气源的距离等因素,从塔中Ⅰ号断裂坡折带至中央断垒带,蒸发分馏作用和气洗作用发生的频率逐渐降低,但基态原油分布频率有增高的趋势。并且Ⅰ号断裂坡折带部分凝析油、高蜡油的形成主要与上述蒸发分馏、气洗、晶析等储层内的次生蚀变作用有关。     

Prediction of non-cavitation propeller noise in time domain

The blade frequency noise of non-cavitation propeller in a uniform flow is analyzed in time domain. The unsteady loading (dipole source) on the blade surface is calculated by a potential-based surface panel method. Then the time- dependent pressure data is used as the input for Ffowcs Williams-Hawkings formulation to predict the acoustics pressure. The integration of noise source is performed over the true blade surface rather than the nothickness blade surface, and the effect of hub can be considered. The noise characteristics of the non-cavitation propeller and the numerical discretization forms are discussed.