Experimental,Numerical and Simplified Theoretical Model Study for Internal Solitary Wave Load on FPSO with Emphasis on Scale Effect     

Zhang  Rui-rui  Chen  Ke  You  Yun-xiang 《中国海洋工程》2019,33(1):26-33

Scale effect of ISWs loads on Floating Production Storage and Offloading(FPSO) is studied in this paper. The application conditions of KdV, eKdV and MCC ISWs theories are used in the numerical method. The depthaveraged velocities induced by ISWs are used for the velocity-inlet boundary. Three scale ratio numerical models λ=1, 20 and 300 were selected, which the scale ratio is the size ratio of numerical models to the experimental model.The comparisons between the numerical and former experimental results are performed to verify the feasibility of numerical method. The comparisons between the numerical and simplified theoretical results are performed to discuss the applicability of the simplified theoretical model summarized from the load experiments. Firstly, the numerical results of λ=1 numerical model showed a good agreement with former experimental and simplified theoretical results. It is feasible to simulate the ISWs loads on FPSO by the numerical method. Secondly, the comparisons between the results of three scale ratio numerical models and experimental results indicated that the scale ratios have more significant influence on the experimental horizontal forces than the vertical forces. The scale effect of horizontal forces mainly results from the different viscosity effects associated with the model’s dimension.Finally, through the comparisons between the numerical and simplified theoretical results for three scale ratio models, the simplified theoretical model of the pressure difference and friction forces exerted by ISWs on FPSO is applied for large-scale or full-scale FPSO.  相似文献   

Deposition Process of Dust Microparticles from Aerosol to Snow-Firn Pack on Glacier No. 1 in Eastern Tianshan Mountains, China     

尤晓妮  董志文 《中国地质大学学报(英文版)》2011,(4)

Samples were continuously collected from aerosol, fresh snow, and snow pits on Glacier No. 1 at Urumqi River source in eastern Tianshan (天山) Mountains. The deposition processes and the characteristics of mineral dust microparticles from aerosol to fresh snow, and then evolution to the snow pit were determined. Total dust microparticle concentration in the surface snow and aerosol showed a similar temporal variation trend, which was strongly associated with regional and local at-mospheric circulation in the ...  相似文献   

潜孔锤微型桩技术在广元市凤凰山公园滑坡应急治理中的应用     

肖尤元  叶晓华 《地质灾害与环境保护》2011,22(4):72-77

微型桩技术广泛应用于地质灾害应急抢险治理工程中.凤凰山公园滑坡应急治理工程中,在调查滑坡地理条件、地质条件和基本特征的基础上,采用潜孔锤微型钻孔灌注桩技术,辅以挡土板和格构砼的综合治理方案.结果表明工程安全、快速、高效、造价低、质量高,治理效果明显.  相似文献   

六盘水市地质灾害现状调查及防治     

游桂芝 《地质灾害与环境保护》2011,22(3):39-42

六盘水市为地质灾害多、高发区,近年罕见的灾害性天气诱发隐患点大增,全市防治工作面临新的挑战.在对2010年地质灾害现状调查的基础上,分析和总结地质灾害特点及防治工作现状,并有针对性地提出了防治建议.  相似文献   

Upper mantle P-wave tomography across the Longmenshan fault belt from passive-source seismic observations along Aba-Longquanshan profile     

Zhiming Bai  Xiaobo Tian  You Tian 《Journal of Asian Earth Sciences》2011,40(4):873-882

A passive seismic experiment across the Longmenshan (LMS) fault belt had been conducted between August 2006 and July 2007 for the understanding of geodynamic process between the Eastern Tibet and Sichuan basin. We herein collected 3677 first P arrival times with high precision from seismograms of 288 teleseismic events so as to reconstruct the upper mantle velocity structure. Our results show that the depth of the Lithosphere–asthenosphere boundary (LAB) changes from 70 km beneath Eastern Tibet to about 110 km beneath Longquanshan, Sichuan Basin, which is consistent with the receiver function imaging results. The very thin mantle part of the lithosphere beneath Eastern Tibet may suggest the lithosphere delamination due to strong interaction between the Tibetan eastward escaping flow and the rigid resisting Sichuan basin, which can be further supported by the existences of two high-velocity anomalies beneath LAB in our imaging result. We also find there are two related low-velocity anomalies beneath the LMS fault belt, which may indicate magmatic upwelling from lithosphere delamination and account for the origin of tremendous energy needed by the devastating Wenchuan earthquake.  相似文献   

六盘水市煤炭资源开发利用结构调整与优化的探讨     

游桂芝  潘庆英 《中国煤炭地质》2011,(5):69-72

六盘水市矿产资源丰富,尤以煤炭为主,但从目前煤炭资源开发利用现状来看,其结构布局尚欠合理,开发利用方式比较粗放,存在＂采富弃贫、大矿小开、一矿多开、技术落后、安全条件差、资源回收率低＂等现象,环境保护与恢复治理的难度也越来越大。为了提高煤炭资源开采利用效率,从规模结构、技术结构、产品结构三个方面提出了六盘水市煤炭资源开发利用结构调整与优化方法：要求新建矿山在30万t/a以上,最低服务年限不低于25年,将目前的小型煤矿山减少到125个;采用高新技术和先进技术,促进矿企产业升级;进行产品结构调整,改变采矿、选矿、冶炼方式,实现集约型经营。  相似文献   

Geochemistry, Geochronology, Sr-Nd Isotopic Compositions of Jiang Tso Ophiolite in the Middle Segment of the Bangong- Nujiang Suture Zone and Their Geological Significance   总被引：1，自引：0，他引：1  

HUANG Qiangtai  LI Jianfeng  CAI Zhourong  XIA Lianze  YUAN Yajuan  LIU Huichuan  XIA Bin 《《地质学报》英文版》2015,89(2):389-401

The Jiang Tso ophiolite,situated in the middle segment of the Bangong- Nujiang Suture Zone,is a part of the easternmost Qieli Lake ophiolite subzone and is close to the south of Pung Lake ophiolite. The rock association of Jiang Tso ophiolite is relatively complete and is mainly composed of metamorphic peridotite,gabbro and diabase. Comparing with N-MORB,the ophiolite is high in Mg and low in Ti,K,Na,P,and is depleted in Nb,Ta,Hf,Th and enriched in Rb,Sr and Ba. Geochemical characteristics of the Jiang Tso ophiolite indicate it is of a supra-subduction zone type formed in the spreading ridge of back arc basin. The SHRIMP U-Pb dating of zircons from the gabbro yielded a weighted average age of 188.1±4.1 Ma(MSWD=1.4),indicating the Jiang Tso ophiolite was formed in the late stage of early Jurassic. The Sr,Nd isotopic compositions show that the Tethyan mantle domain is the depleted mantle(DM),with enriched mantle domain II(EM II). They have the same Sr,Nd isotopic composition with the India Ocean MORB type.  相似文献   

西沙群岛西科1井第四纪生物礁中典型暴露面的岩石学与孔隙特征   总被引：2，自引：0，他引：2       下载免费PDF全文

尤丽  于亚苹  廖静  刘立  刘娜  赵爽  李晓 《地球科学》2015,40(4):671-676

根据岩心观察、薄片鉴定和图像分析, 对西科1井第四纪发育的典型暴露面及其附近的岩石类型、成岩作用和孔隙类型进行了系统的分析.研究表明: 典型暴露面(埋深68.75~70.24 m)附近的岩石类型为骨架灰岩和泥粒灰岩, 成岩作用类型包括溶解作用、胶结作用、泥晶化作用和新生变形作用, 孔隙类型主要为粒间孔和粒间溶孔、粒内孔及粒内溶孔、生长骨架孔及其溶孔、铸模孔和晶间溶孔.碳酸盐矿物的悬垂状产状、生物体腔孔充填物的方解石化和普遍发育的溶解作用指示该深度段遭受了大气水淋滤的强烈改造.   相似文献   

Potential impact of climate change on cereal crop yield in West Africa     

Kazi Farzan Ahmed  Guiling Wang  Miao Yu  Jawoo Koo  Liangzhi You 《Climatic change》2015,133(2):321-334

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鲤JAK2基因分子克隆及组织表达分析     

付友  高谦  文春根  吴平  刘德立 《广东海洋大学学报》2015,(1):8-17

采用同源克隆策略和RACE-PCR技术,克隆得到可能的鲤(Cyprinus carpio)两面神激酶2(JAK2)基因的c DNA全长序列,包括3 378 bp的开放阅读框,732 bp的5'-非编码区,529 bp的3'-非编码区,总长度达4 639bp。开放阅读框可编码1 125个氨基酸,推测分子质量和理论等电点分别为129.33 ku和6.99。同源性分析显示,克隆的鲤鱼基因与斑马鱼(Danio rerio)JAK2同源性最高,其氨基酸序列同一性和相似度分别达89%和95%。结构域预测表明,所编码氨基酸序列包含FERM、SH2及两个酪氨酸激酶结构域,这4个结构域也保守地存在于其他脊椎动物的JAK分子中。高级结构预测显示,鲤JAK2主要包括α-螺旋(α-helix)、β-折叠(β-sheet)和连接环(loop)等3类结构元件。脊椎动物JAK分子系统进化树显示,JAK1、JAK2、JAK3和TYK2等4类JAK分子分别聚类,鲤JAK2处于JAK2支系中,与所有其他的鱼类JAK2聚为一大支,并与两栖类和哺乳类组成的另一大支构成姊妹群,表明它们具有共同的祖先基因,为直系同源关系。实时荧光定量PCR检测结果表明,鲤JAK2在皮肤中表达量最高,其次是肠、血液和脑,而在肌肉、鳃、头肾、心、肝、脾中表达量较低;鲤JAK3在脾中表达量最高,在其他组织中表达量均很低,甚至未检出。  相似文献