A new analytical method for quantifying of sterane and hopane biomarkers   总被引：2，自引：0，他引：2  

HuiTong Wang  ShuiChang Zhang  Na Weng  Bin Zhang  XiaoFang Wei  Han Yu  CaiYun Wei 《中国科学:地球科学(英文版)》2014,57(8):1713-1722

An analytical method for quantifying biomarker compounds of the sterane and the hopane existing in saturated hydrocarbons has been established by using comprehensive two-dimensional gas chromatography-flame ionization detector (GC×GC-FID) with optimized operating parameters. The new method achieves the quantification by using a GC×GC-FID system which is able to completely separate steranes from hopanes. The data obtained by the new method are of good repeatability and reliability. Compared with the original data, the relative standard deviations (RSDs) of 12 reference compounds are less than 5%. The RSDs of the quantitative results of the biomarkers based on seven separate analyses are also less than 5%. Compared with the traditional method of gas chromatography-mass spectrometry (GC-MS), the new method has a number of advantages, such as common internal standards (ISs), high resolution, no co-eluting peak, and no interference caused by diagnostic ion peaks. The new method provides petroleum geologists with an effective and scientific means in future researches.  相似文献   

Parameter-dependent vibration-attenuation controller design for electro-hydraulic actuated linear structural systems     

Falu Weng  Weijie Mao 《地震工程与工程振动(英文版)》2012,11(1):73-82

The problem of robust active vibration control for a class of electro-hydraulic actuated structural systems with time-delay in the control input channel and parameter uncertainties appearing in all the mass,damping and stiffness matrices is investigated in this paper.First,by introducing a linear varying parameter,the nonlinear system is described as a linear parameter varying(LPV)model.Second,based on this LPV model,an LMI-based condition for the system to be asymptotically stabilized is deduced.By solving these LMIs,a parameter-dependent controller is established for the closedloop system to be stable with a prescribed level of disturbance attenuation.The condition is also extended to the uncertain case.Finally,some numerical simulations demonstrate the satisfying performance of the proposed controller.  相似文献   

山东省“十二五”基础测绘技术进展概述          下载免费PDF全文

曲莉莉  陈瑞聪  王爱华 《山东国土资源》2012,28(9):57-59,62

以1∶1万基础地理信息为重点的"十二五"基础地理信息更新,关乎山东省经济社会发展,如何高效、低成本做好基础测绘更新,为国民经济、社会发展提供空间定位优质服务,十分重要。综述了山东省"十二五"基础测绘更新思路、新技术应用、质量控制方法等技术进展。  相似文献   

海洋可控源电磁法空气波研究现状及展望   总被引：2，自引：0，他引：2  

殷长春  刘云鹤  翁爱华  贾定宇  贲放 《吉林大学学报(地球科学版)》2012,42(5):1506-1520

海洋可控源电磁法是钻前储层评价的有效手段,它可作为海洋地震重要辅助手段识别海底构造的储油/储水特征,从而减少盲钻率和勘探成本。然而,当使用水平电偶极作为发射源在浅水区测量时,沿空气-海水分界面传播的空气波会完全掩盖从高阻储油层返回的有用信号。由于空气波不含海底储油层的任何信息,空气波的存在严重影响海洋电磁的应用。因此,如何在浅水区观测数据中去除空气波影响以取得好的反演结果成为当前海洋电磁法的研究热点之一。首先基于Weidelt的空气波理论并采用对TE谱核直接求导的方法推导出空气波的主导项,然后根据空气波的物理成因及影响特征阐述了海洋电磁数据解释之前必须去除空气波的原因,最后将目前处理空气波问题的方法分成3类：1)根据空气波在频率域和时间域的特性去除或压制空气波,2)采用无空气波的测量方式,3)直接对含空气波的电磁数据进行反演解释。通过比较各种方法的效果,发现所有方法都有自己的应用条件和局限性。为有效地压制和去除空气波,各种方法的组合也许有更好的应用效果。  相似文献   

Pseudo‐dynamic tests of a full‐scale CFT/BRB frame—Part I: Specimen design,experiment and analysis     

Keh‐Chyuan Tsai  Po‐Chien Hsiao  Kung‐Juin Wang  Yuan‐Tao Weng  Min‐Lang Lin  Ker‐Chun Lin  Chui‐Hsin Chen  Jiun‐Wei Lai  Sheng‐Lin Lin 《地震工程与结构动力学》2008,37(7):1081-1098

A series of pseudo‐dynamic tests (PDTs) of a full‐scale 3‐story 3‐bay buckling‐restrained braced frame (BRBF) using concrete‐filled tube columns was tested in the Taiwan National Center for Research on Earthquake Engineering using networked PDT techniques in October 2003. During the tests, real‐time experimental responses and video were webcasted to Internet viewers. The input ground motions adopted for the PDTs were chosen from the 1999 Chi‐Chi and the 1989 Loma Prieta earthquakes and scaled to represent three seismic hazard levels. This paper is in two parts, focusing on the investigations of the overall structure and the local members. This paper constitutes Part I and discusses the design, analytical investigations, and key experimental results of the specimen frame, such as the buckling of the brace‐to‐gusset joints. Part II of the paper, the companion paper, describes the gusset stiffening schemes and detailed experimental behavior of the BRBs and their connections. Experimental peak inter‐story drifts of 0.019 and 0.023 radians, prescribed for the design basis and the maximum credible earthquakes, respectively, are within the target design limits of 0.020 and 0.025 radians. These tests confirmed that the PISA3D and OpenSees nonlinear structural analysis computer programs can simulate the experimental peak shears and floor displacements well. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Relationship between equatorial pressure oscillations and tropical cyclones landing over China     

Ji ZhongPing  Xie JiongGuang  Liang Jian  Jin RongHua  Wen Jing  Weng XiangYu 《中国科学D辑(英文版)》2008,51(1):123-133

With daily reanalysis data by NCEP/NCAR and data of tropical cyclones landing over China from 1949 to 2005, the variation of low-frequency oscillations of equatorial pressure and their relationship with tropical cyclones landing over China in the summer half of the years (June through October) are studied for the 57 years, using spectral analysis and correlation analysis. The results show that the summertime equatorial pressure is mainly of periodic oscillations of 5―7 days and 10―30 days and the interannual variation of the intensity of its quasi-biweekly oscillation is significantly positive correlation with the number of tropical cyclones landing over China. The quasi-biweekly oscillation is filtered from daily equatorial pressure in May―November over the 57 years with inverse wavelet transform and the probability for tropical cyclones landing on coastal China within four days before and after the oscillatory valleys of quasi-biweekly pressure at the equator is 59.7% and 73.0% for June to October and July to September respectively. The model of atmospheric circulation for quasi-biweekly oscillatory valleys of equatorial pressure in association with or without tropical cyclones landing over China in July―September is set up with the composite analysis method. When the valleys are associated with (without) landfall, zonal (meridional) circulation prevails in the mid and high latitudes of the Eastern Hemisphere, the high pressure ridge is weak (strong) near the Sea of Okhotsk, the westerly zone is northward (southward), the subtropical high is westward (eastward) in location and strong (weak) in intensity, the cross-equatorial flow is strong (weak) in southeast Asia, Southwest Monsoon is strong (weak) and stronger (weaker) while in the valleys of pressure, being favorable (unfavorable) for tropical cyclones landing over China. The atmospheric circulation model for oscillatory valleys of biweekly equatorial pressure in association with (without) tropical cyclones landing over China, which can reflect the difference of atmospheric circulation between them, is beneficial to medium-term forecasts of tropical cyclones landing over China.  相似文献   

虹吸水流作用下的土柱运动特性及虹吸管道防淤堵措施     

吴纲  谢威  严鑫  翁杨  孙红月 《吉林大学学报(地球科学版)》2019,49(5):1398-1404

虹吸排水联合堆载固结技术是软基处理中的一项新技术,在应用该技术时,虹吸管内土柱的淤堵问题是制约该技术发展的核心问题之一。针对虹吸管内土柱的淤堵问题,采用颗粒沉降模型和水动力学相关理论,推导得到了土柱在虹吸水流作用下的临界高度表达式。根据所推求的表达式,可以制定相应的防淤堵措施,使得虹吸排水能够顺利进行。研究结果表明：土柱容易在虹吸管弯曲圆弧段形成淤堵;对于工程现场最常见的4 mm内径虹吸管,当虹吸管弯曲圆弧段半径大于40 cm或者虹吸管内土柱高度大于4 cm时,就有可能产生淤堵;实际工程中,可以采用减小虹吸管弯曲圆弧段半径、降低虹吸管出水口高度以及减小虹吸管长度的措施减小淤堵的可能,从而保证虹吸过程的持续进行。  相似文献   

Seismic performance evaluation of a 34‐story steel building retrofitted with response modification elements     

Yuan‐Tao Weng  Keh‐Chyuan Tsai  Pei‐Ching Chen  Chung‐Che Chou  Ya‐Ran Chan  Sheng‐Jhih Jhuang  Yung‐Yu Wang 《地震工程与结构动力学》2009,38(6):759-781

The original structural design of this case study consisted of five basement floors and a 34‐story hotel tower in Kaohsiung, Taiwan. The construction started in 1993, and the erection of the entire steel frame and the pouring of concrete slabs up to the 26th floor were completed before 1996. However, construction of the original hotel was subsequently suspended for 10 years. Recently, this building has been retrofitted for residential purposes. Buckling restrained braces (BRBs) and eccentrically braced frames were incorporated into the seismic design of the new residential tower. This paper presents the seismic resisting structural system, seismic design criteria, full‐scale test results of one BRB member and the as‐built welded moment connections. Test results confirm that the two side web‐plate stiffening details can effectively improve the rotational capacity of welded moment connection. The paper also discusses the analytical models for simulating the experimental responses of the BRB members and the welded moment connections. Nonlinear response history analyses (NLRHA) indicate that the inelastic deformational demands of the original and the redesigned structures induced by the maximum considered earthquakes are less than those found in the seismic building codes or laboratory tests. This paper also proposes a ground motion scaling method considering multi‐mode effects for NLRHA of the example building. It is shown that the proposed scaling method worked well in reducing the scatter in estimated peak seismic demands. Copyright © 2008 John Wiley & Sons, Ltd.  相似文献   

Earthquake location in transversely isotropic media with a tilted symmetry axis   总被引：2，自引：0，他引：2  

Aihua Zhao  Zhifeng Ding 《Journal of Seismology》2009,13(2):301-311

The conventional intersection method for earthquake location in isotropic media is developed in the case of transversely isotropic media with a tilted symmetry axis (TTI media). The hypocenter is determined using its loci, which are calculated through a minimum travel time tree algorithm for ray tracing in TTI media. There are no restrictions on the structural complexity of the model or on the anisotropy strength of the medium. The location method is validated by its application to determine the hypocenter and origin time of an event in a complex TTI structure, in accordance with four hypotheses or study cases: (a) accurate model and arrival times, (b) perturbed model with randomly variable elastic parameter, (c) noisy arrival time data, and (d) incomplete set of observations from the seismic stations. Furthermore, several numerical tests demonstrate that the orientation of the symmetry axis has a significant effect on the hypocenter location when the seismic anisotropy is not very weak. Moreover, if the hypocentral determination is based on an isotropic reference model while the real medium is anisotropic, the resultant location errors can be considerable even though the anisotropy strength does not exceed 6.10%.  相似文献   

构建面向个性化服务的特大城市云空间数据中心     

陶迎春  刘光  庞京辉  吴爱华  赵凌美 《测绘通报》2017,(2):10

特大城市测绘地理信息数据具有数据海量、增长快速、多源异构、频繁使用的特点。随着大数据和Web2.0时代的到来,传统的空间数据存储管理与共享服务模式存在成果缺乏整合和挖掘、空间信息服务被动且无差别性等缺点,难以满足用户不断提高的空间数据内容、服务响应速度和服务质量的要求,也难以适应因人而异的个性化空间信息服务的需求。本文对个性化服务和云空间数据中心构建的关键技术进行了研究,提出了个性化空间数据情境应用模式,以及一种基于Web客户端的个人异构空间数据在线集成方法,基于NoSQL实现了个人空间数据与传统空间数据服务集成,并以北京市为例基于私有云构建了安全可靠、高效运行、可扩展、用户参与度高、提供个性化服务的特大城市云空间数据中心。  相似文献