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Application of frequency division inversion in the prediction of heterogeneous natural gas hydrates reservoirs in the Shenhu Area,South China Sea

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China Geology 2022年第2期5卷 251-266页

作者： Shu-yu Wu Jun Liu hua-ning xu Chang-ling Liu Fu-long Ning Hong-xian Chu Hao-ran Wu Kai Wang School of Engineering China University of GeosciencesWuhan 430074China Yantai Coastal Zone Geological Survey Center China Geological SurveyYantai 264001China Chinese Academy of Geological Sciences Beijing 100037China Laboratory for Marine Mineral Resources Qingdao National Laboratory for Marine Science and TechnologyQingdao 266061China The Key Laboratory of Gas Hydrate Ministry of Natural ResourcesQingdao Institute of Marine GeologyQingdao 266071China

Drilling results suggest that the thickness of natural gas hydrates(NGHs)in the Shenhu Area,South China Sea(SCS)are spatially heterogenous,making it difficult to accurately assess the NGHs resources in this *** the case that free gas exists beneath hydrate deposits,the frequency of the hydrate deposits will be noticeably attenuated,with the attenuation degree mainly affected by pore development and free gas ***,the frequency can be used as an important attribute to identify hydrate *** on the time-frequency characteristics of deposits,this study predicted the spatial distribution of hydrates in this area using the frequency division inversion method as ***,the support vector machine(SVM)method was employed to study the amplitude versus frequency(AVF)response based on seismic and well logging ***,the AVF response was introduced as independent information to establish the nonlinear relationship between logging data and seismic ***,the full frequency band information of the seismic data was fully utilized to obtain the results of frequency division *** inversion results can effectively broaden the frequency band,reflect the NGHs distribution,and reveal the NGHs reservoirs of two types,namely the fluid migration pathway type and the in situ self-generation self-storage diffusion ***,the inversion results well coincide with the drilling ***,it is feasible to use the frequency division inversion to predict the spatial distribution of heterogeneous NGHs reservoirs,which facilitates the optimization of favorable drilling targets and is crucial to the resource potential assessment of NGHs.

关键词： Gas hydrates Heterogeneity Frequency division inversion Self-generation and self-storage diffusion type NGHs exploration trial engineering Oil and gas exploration engineering Shenhu Area South China Sea

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DBD涡流发生器及其在角区流动控制中的数值研究

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航空学报 2016年第6期37卷 1743-1752页

作者：徐向南张华胡波北京航空航天大学航空科学与工程学院教育部流体力学重点实验室北京100083

为明确介质阻挡放电(DBD)涡流发生器对马蹄涡的影响,在采用唯象模型的基础上,通过数值方法研究了DBD涡流发生器诱导产生流向涡的结构特性及其对马蹄涡的控制特性。研究结果表明,流动在激励器上游边缘处形成羊角涡,自由剪切层卷入流向涡... 详细信息

为明确介质阻挡放电(DBD)涡流发生器对马蹄涡的影响,在采用唯象模型的基础上,通过数值方法研究了DBD涡流发生器诱导产生流向涡的结构特性及其对马蹄涡的控制特性。研究结果表明,流动在激励器上游边缘处形成羊角涡,自由剪切层卷入流向涡的涡核并为其提供持续涡量;在柱体根部角区流动中,当对称面两侧激励器诱导流动指向对称面,诱导涡与马蹄涡环绕方向相反时,马蹄涡可以得到有效抑制,反之,则控制效果不佳。最后得出,诱导涡对下游马蹄涡的控制机制体现在其黏性扩散作用、掺混作用以及低压效应3个方面。

关键词： DBD涡流发生器数值模拟流向涡角区流动马蹄涡

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On three-dimensional geological modeling and visualization

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Science China Earth Sciences 2004年第8期47卷 739-748页

作者： WU Qiang1 & xu hua2 1. Department of Resource Exploitation Engineering, China University of Mining and Technology, Beijing 100083, China 2. Beijing Institute of Petrochemical Technology, Beijing 102617, China Department of Resource Exploitation Engineering China University of Mining and Technology Beijing China Beijing Institute of Petrochemical Technology Beijing China

The technology of 3D geological modeling will bring about great changes in the methods of geological data acquiring, storing, processing and displaying. However, no perfect or convenient software systems have been developed up to now since the geologic data which re-flect geological entities bear the feature of diversity, uncertainty and complexity. Some supervoxel models, mathematical models of fault and geometrical models of fold have been contrived so as to show the space geometric configuration of the complicated geologic structures. The application-oriented system architecture for 3D geological modeling is established; and a novel design concept based on spatial data processing is also proposed with the technology of solid modeling as its core and the application of models as its objective. Theories and methods for 3D geological modeling will hopefully be enriched and developed. In the light of these theories and methods, a feature-based navigation visualization technique is also put forward in the paper. By integrating geo-database, graphics libraries and KBS with 3D dynamic simulation systems, geologists will be able to capture the partial characteristics and whole structure embodied in the geological data in a direct-viewing, figurative and accurate manner.

关键词： 3D geological modeling,geometrical model,system architecture,visualization

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东濮凹陷文留气藏天然气成因与成藏史分析

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石油勘探与开发 2005年第4期32卷 118-124页

作者：许化政周新科中国石化石油勘探开发研究院

文留构造是在东濮凹陷中央隆起带背景上因盐聚集而形成的背斜构造,构造翼部因盐滑塌而使圈闭幅度加大。构造圈闭内沙四段产状平缓,储集层累计厚度大,含气丰度高。地球化学特征显示天然气为典型煤成气藏,成藏类型为“古生新储”。石炭二... 详细信息

文留构造是在东濮凹陷中央隆起带背景上因盐聚集而形成的背斜构造,构造翼部因盐滑塌而使圈闭幅度加大。构造圈闭内沙四段产状平缓,储集层累计厚度大,含气丰度高。地球化学特征显示天然气为典型煤成气藏,成藏类型为“古生新储”。石炭二叠系煤系在中、下三叠统沉积后完成第一次生烃过程,Ro、磷灰石裂变径迹等资料证实,当时煤系的古埋深约为3500m,古地温为118℃,Ro值为0.85%;中生代该区以抬升剥蚀为主,煤系生烃中止;古近纪裂谷发育期间,煤系埋深加大,进入二次生气期,东营组沉积后达到生气峰值阶段。其后东营运动的抬升剥蚀加速了煤成气的扩散、运移和聚集成藏。二次运移的主动力为其自身的高浓度和高压力潜能,运移的主通道是裂隙断裂系统。

关键词：文留气藏 C-P煤系二次生烃古地温成藏史

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基于MILO结构的一种单边multipactor模型分析

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物理学报 2009年第7期58卷 4799-4805页

作者：应旭华郝建红华北电力大学电气与电子工程学院北京102206

根据高功率微波源相互作用腔的物理结构特性,以磁绝缘传输线振荡器(MILO)为例,建立了一种单边二次电子倍增效应(mulitpactor)模型.采用概率统计和蒙特卡罗(MC)模拟方法,计算了敏感曲线和二次电子的时间演化规律,分析了射频场参数对二次... 详细信息

根据高功率微波源相互作用腔的物理结构特性,以磁绝缘传输线振荡器(MILO)为例,建立了一种单边二次电子倍增效应(mulitpactor)模型.采用概率统计和蒙特卡罗(MC)模拟方法,计算了敏感曲线和二次电子的时间演化规律,分析了射频场参数对二次电子倍增效应的影响,并提出了减小和抑制二次电子倍增效应的具体措施.

关键词：单边二次电子倍增效应敏感曲线二次电子的时间演化

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TrkA regulates the regenerative capacity of bone marrow stromal stem cells in nerve grafts

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Neural Regeneration Research 2019年第10期14卷 1765-1771页

作者： Mei-Ge Zheng Wen-Yuan Sui Zhen-Dan He Yan Liu Yu-Lin huang Shu-hua Mu Xin-Zhong xu Ji-Sen Zhang Jun-Le Qu Jian Zhang Dong Wang Department of Orthopedics The Seventh Hospital of Sun Yat-sen UniversityShenzhenGuangdong ProvinceChina Department of Orthopedics The Second Hospital of Anhui Medical UniversityHefeiAnhui ProvinceChina School of Medicine Shenzhen UniversityShenzhenGuangdong ProvinceChina Department of Scientific Research The Seventh Hospital of Sun Yat-sen UniversityShenzhenGuangdong ProvinceChina Psychology & Social College of Shenzhen University ShenzhenGuangdong ProvinceChina Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Optoelectronic EngineeringShenzhen UniversityShenzhenGuangdong ProvinceChina

We previously demonstrated that overexpression of tropomyosin receptor kinase A(TrkA)promotes the survival and Schwann celllike differentiation of bone marrow stromal stem cells in nerve grafts,thereby enhancing the regeneration and functional recovery of the peripheral *** the present study,we investigated the molecular mechanisms underlying the neuroprotective effects of TrkA in bone marrow stromal stem cells seeded into nerve *** marrow stromal stem cells from Sprague-Dawley rats were infected with recombinant lentivirus vector expressing rat TrkA,TrkA-shRNA or the respective *** cells were then seeded into allogeneic rat acellular nerve allografts for bridging a 1-cm right sciatic nerve ***,8 weeks after surgery,hematoxylin and eosin staining showed that compared with the control groups,the cells and fibers in the TrkA overexpressing group were more densely and uniformly arranged,whereas they were relatively sparse and arranged in a disordered manner in the TrkA-shRNA *** blot assay showed that compared with the control groups,the TrkA overexpressing group had higher expression of the myelin marker,myelin basic protein and the axonal marker neurofilament *** TrkA overexpressing group also had higher levels of various signaling molecules,including TrkA,pTrkA(Tyr490),extracellular signal-regulated kinases 1/2(Erkl/2),pErk1/2(Thr202/Tyr204),and the anti-apoptotic proteins Bcl-2 and *** contrast,these proteins were downregulated,while the pro-apoptotic factors Bax and Bad were upregulated,in the TrkA-shRNA *** levels of the TrkA effectors Akt and pAkt(Ser473)were not different among the *** results suggest that TrkA enhances the survival and regenerative capacity of bone marrow stromal stem cells through upregulation of the Erk/Bcl-2 *** procedures were approved by the Animal Ethical and Welfare Committee of Shenzhen University,China in December 2014(approval ***-2014-001219).

关键词： nerve regeneration bone marrow stromal stem cells tropomyosin receptor kinase A receptor lentiviral vector shRNA extracellular signal-regulated protein kinases 1/2 Bcl-2 nerve grafts peripheral nerve regeneration survival neural regeneration

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钢管混凝土拱空间高效双非线性有限元分析

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工程力学 2014年第12期31卷 89-95,111页

作者：邓继华邵旭东长沙理工大学桥梁结构安全控制湖南省工程实验室湖南长沙410076 湖南大学土木工程学院湖南长沙410082

大跨度钢管混凝土空间桁架拱桥的复杂造型使得有限元分析极为特殊,对非线性分析方法的计算精度和效率提出更高要求。采用共旋坐标法,根据共旋坐标系下应变与消除刚体位移后的变形呈线性关系的特点,利用虚功原理无需迭代就能计算出该坐... 详细信息

大跨度钢管混凝土空间桁架拱桥的复杂造型使得有限元分析极为特殊,对非线性分析方法的计算精度和效率提出更高要求。采用共旋坐标法,根据共旋坐标系下应变与消除刚体位移后的变形呈线性关系的特点,利用虚功原理无需迭代就能计算出该坐标系下完全粘结钢管混凝土梁单元考虑材料非线性的切线刚度矩阵,再基于场一致性原则导出结构坐标系下考虑几何与材料双重非线性的切线刚度矩阵,从而建立钢管混凝土拱空间高效非线性分析方法。编制了相应的程序,对钢管混凝土模型拱的面内与面外受力进行了计算分析,结果表明在计算精度和效率上是比较满意的。

关键词：钢管混凝土拱共旋坐标法空间双非线性场一致性切线刚度矩阵

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Inhibitory effect of ginsenoside Rg3 combined with cyclophosphamide on growth and angiogenesis of ovarian cancer

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Chinese Medical Journal 2007年第7期120卷 584-588页

作者： xu Tian-min XIN Ying CUI Man-hua JIANG Xin GU Li-ping Department of Obstetrics and Gynaecology Second Hospital of Jilin University Changchun 130041 China Key Laboratory of Pathobiology Ministry of Education Jilin University Changchun 130021 China Department of Radiotherapy Second Hospital of Jilin University Changchun 130041 China

Background Ginsenoside Rg3, the main component isolated from ginseng, inhibits some kinds of tumour growth and angiogenesis. The combination of low dose chemotherapy and antiangiogenesis inhibitors suppresses growth of experimental tumours more effectively than conventional therapy. The effect of this combination on ovarian cancer remains to be evaluated. Therefore, we investigated the synergism of ginsenoside Rg3 and cyclophosphamide （CTX） on growth and angiogenesis of human ovarian cancer. Methods Twenty-eight female athymic mice were divided randomly into 4 groups of 7： ginsenoside Rg3, CTX, ginsenoside Rg3 and CTX combination and control, after being transplanted with ovarian cancer cells （SKOV-3）. The mice were given intraperitoneal injection of ginsenoside Rg3 and CTX for the 10 days following inoculation of SKOV-3 cells. The life quality and number of living days of mice were recorded. The size of tumour, tumour inhibitive rate, life elongation rate, proliferating cell nuclear antigen labelling index （PCNALI）, expression of vascular endothelial cell growth factor （VEGF） and microvessel density （MVD） of the tumour tissues were estimated. Results Life quality of mice in ginsenoside Rg3 and combined treatment groups were better and number of living days longer than control. Average tumour weights of each treated group were less than control and there was no significant difference among the treated groups. PCNALI of treated groups was lower than control. The MVD value and VEGF expression in treated groups were significantly lower than control and the MVD values of ginsenoside Rg3 and combined treatment groups were lower than that of CTX group. Conclusions Ginsenoside Rg3 significantly inhibited growth and angiogenesis of ovarian cancer when used alone or combined with CTX. Ginsenoside Rg3 and CTX combination reinforced the antitumour effect each other and improved the living quality and survival time of mice with tumour.

关键词： ginseng cyclophosphamide angiogenesis ovarian cancer

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Global Existence of Solutions for the Kawahara Equation in Sobolev Spaces of Negative Indices

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Acta Mathematica Sinica,English Series 2007年第8期23卷 1435-1446页

作者： hua WANG Shang Bin CUI Dong Gao DENG Department of Mathematics Sun Yat-Sen University Guangdong 510275 P. R. China

We first prove that the Cauchy problem of the Kawahara equation, δtu ＋ uδxu ＋βδx^3u＋γδx^5u = 0, is locally solvable if the initial data belong to H^r（R） and r〉 r≥-7/5, thus improving the known local well-posedness result of this equation. Next we use this local result and the method of ＂almost conservation law＂ to prove that global solutions exist if the initial data belong to H^r（R） and r〉-1/2.

关键词： Kawahara equation Cauchy problem global solution almost conservation law

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社会网络环境下基于公众行为大数据属性挖掘的大群体应急决策方法及应用

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控制与决策 2022年第1期37卷 175-184页

作者：徐选华余紫昕中南大学商学院长沙410083

针对社会网络环境下复杂大群体应急决策中决策属性信息难以获得问题,提出社会网络环境下公众行为大数据驱动的大群体应急决策方法.首先,通过挖掘社交平台上的公众行为大数据,利用TF-IDF、Word2vec技术进行关键词提取、聚类及其影响力分... 详细信息

针对社会网络环境下复杂大群体应急决策中决策属性信息难以获得问题,提出社会网络环境下公众行为大数据驱动的大群体应急决策方法.首先,通过挖掘社交平台上的公众行为大数据,利用TF-IDF、Word2vec技术进行关键词提取、聚类及其影响力分析,从大量行为数据中挖掘大群体决策属性信息以辅助专家决策,使决策结果具有更高的科学性和有效性;其次,构建决策者间基于信任关系和观点相似度的社会网络,采用同时考虑信任和相似度的聚类方法对决策者进行聚类,并基于社会网络分析获得决策者权重;然后,提出基于决策者间信任关系的共识调整方法进行共识调整以获得最终群体决策矩阵和方案排序,通过引入决策者客观自信度避免个别决策者过分自信行为的影响;最后,通过一个新冠疫情案例分析说明方法的可行性和有效性.

关键词：社会网络分析公众行为大数据属性挖掘大群体应急决策

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