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Pore pressure built-up in hydrate-bearing sediments during phase transition: A poromechanical approach

Petroleum Science 2023年第1期20卷 482-494页

作者： shui-tao Zhang Lin-Lin Wang State Key Laboratory of Petroleum Resources and Prospecting China University of Petroleum(Beijing)Beijing102249China Department of Offshore Oil and Gas Engineering College of Safety and Ocean EngineeringChina University of Petroleum(Beijing)Beijing102249China

Due to the density contrast between the hydrate and methane gas,the pore pressure is accumulated in the sediment during the decomposition process of methane *** accumulation of pore pressure decreases the magnitude of effective stress,further triggering potential geological disasters such as *** paper establishes a theoretical framework to investigate the evolution of fluid pressure in the hydrate-bearing sediments during the decomposition *** model consists of two parts:an unsaturated thermo-poromechanical constitutive law as well as a phase equilibrium *** with the existing studies,the present work incorporates the effect of pore volume change into the pressure built-up *** addition,the capillary effect is considered,which plays a nontrivial role in fine-grained *** on this model,the evolution of fluid pressure is investigated in undrained *** is shown that four mechanisms mainly contribute to the pressure built-up:the density contrast between decomposing hydrate and producing fluid,the variation of pore volume,the compaction of hydrate due to variation of capillary pressure,and the thermal deformation of pore constituents induced by temperature *** these mechanisms,the density contrast dominates the pore pressure *** the combined effect of these contributions,the evolution of fluid pressure exhibits a strong nonlinearity during the decomposition process and can reach up to dozens of mega ***,this high-level pressure built-up results in a significant tensile strain,yielding potential fracturing of the sediment.

关键词： Methane hydrate Excess fluid pressure Poromechanical Phase equilibrium

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Relation between human existence and environment viewing from the distribution of prehistoric archaeological sites in the Three Gorges reservoir region of the Yangtze River,China

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Chinese Science Bulletin 2008年第S1期53卷 129-139页

作者： ZHAO DongSheng shui tao Department of History Nanjing UniversityNanjing 210093China

Based on archaeological research findings in the Three Gorges region as well as the distribution of prehistoric sites in this area,the following conclusion can be derived:the unique physical and geographical conditions and variations in the Three Gorges region make local people of different ages seek their survival and development in the favorable environment along the *** evolution has direct impact on the selection of location for *** increase of sites quantity reflects the favorable natural environment,but the decrease just reflects the consequence of such natural disasters as flood.

关键词： the Three Gorges of the Yangtze River prehistoric archaeology site distribution environment change human existence

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Optimal Cooperation Enhancement on Spatial Networks

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Chinese Physics Letters 2014年第11期31卷 1-4页

作者： tao shui-Yuan Cui Ming-Zhu Dai Qiong-Lin Yang Jun-Zhong Beijing Univ Posts & Telecommun Sch Sci Beijing 100876 Peoples R China

We investigate the evolutionary Prisoner＇s dilemma game on the simplest spatial networks constructed as geometrical graphs. The optimal cooperation enhancement against the topology randomness is found. It is proposed that the optimal behavior of the cooperation results from the competition between individuals with high degrees and with low degrees： the former assists the formation of cooperator clusters and the latter tends to prevent the formation of such dusters.

关键词： EVOLUTIONARY PRISONERS-DILEMMA DYNAMICS GAMES

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工程测量中三维测绘技术的应用现状及发展前景

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世界有色金属 2024年第9期 142-144页

作者：刘欣悦向玉楚水滔湖南省自然资源事务中心湖南长沙410000

三维测绘技术已成为工程测量的关键组成部分,其精确的数据收集和处理能力对工程设计、施工和监控产生了深远的影响。技术如摄影测量、遥感、激光雷达、全景扫描以及GPS和GNSS的应用,极大提高了工程测量的效率和精度。随着大数据、云计... 详细信息

三维测绘技术已成为工程测量的关键组成部分,其精确的数据收集和处理能力对工程设计、施工和监控产生了深远的影响。技术如摄影测量、遥感、激光雷达、全景扫描以及GPS和GNSS的应用,极大提高了工程测量的效率和精度。随着大数据、云计算、人工智能和机器学习的融入,三维测绘技术的处理能力和应用范围得到了显著扩展。无人机测绘技术的发展,虽面临技术和法规挑战,但在灵活性和成本效益上展现出巨大潜力。环保测绘的重要性日益凸显,强调了测绘技术在环境监测和资源管理中的作用。

关键词：三维测绘技术工程测量摄影测量遥感技术

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基于Python的房屋安全健康监测数据处理与预测分析

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科学技术与工程 2024年第6期24卷 2469-2479页

作者：孙振林柳飞陶水忠杨晓辉于茜张硕周闯北京市市政工程研究院北京100037 北京市建设工程质量第三检测所有限责任公司北京100037 北京城建勘测设计研究院有限责任公司北京100101

房屋安全问题愈发受到重视,对于老旧房屋的自动化健康监测十分必要。在此背景下,优化自动化监测数据的预处理流程,使用Python丰富的“库”资源构建预处理程序。程序使用灰色关联法对数据进行可信度评估筛选数据,利用箱形图筛选异常数据... 详细信息

房屋安全问题愈发受到重视,对于老旧房屋的自动化健康监测十分必要。在此背景下,优化自动化监测数据的预处理流程,使用Python丰富的“库”资源构建预处理程序。程序使用灰色关联法对数据进行可信度评估筛选数据,利用箱形图筛选异常数据,并对异常数据和缺失数据进行插补替换,最后使用卡尔曼滤波平滑数据以降低数据离散度;自动化监测设备因自身特点易受到周围环境的影响,为此提出了一种利用人工监测数据校核自动化监测数据的数据比对方法,以保证自动化监测数据的准确性和可靠度;最后使用拟合曲线实现变形监测数据的短期预测,预测精度达到0.1%,有效预测时间约10 d,最终的结果满足程序设计需求。

关键词：数据预处理与校核自动化监测短期预测老旧房屋 Python

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Optical soliton in a one-dimensional array of a metal nanoparticle-microcavity complex

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Communications in Theoretical Physics 2021年第11期73卷 108-115页

作者： Ning Ji tao shui Yi-Lou Liu Wang-Rui Zhang Xiu-Mei Chen Wen-Xing Yang School of Physics and Optoelectronic Engineering Yangtze UniversityJingzhou434023China

Quantum coherence can be enhanced by placing metal nanoparticles(MNPs)in optical *** localized-surface plasmon resonances(LSPRs),nonlinear interaction between the LSPR and microcavity arrays of a MNP-microcavity complex offer a unique playground to observe novel optical phenomena and develop novel concepts for quantum *** we theoretically demonstrate that optical solitons are achievable with a one-dimensional array which consists of a chain of periodically spaced identical MNP-microcavity complex *** differ from the solitons which stem from the MNPs with nonlinear Kerr-like response;the optical soliton here originates from LSPR-microcavity *** experimentally achievable parameters,we identify the conditions under which the nonlinearity induced by LSPR-microcavity interaction allows us to compensate for the dispersion caused by photon hopping of adjacent *** interestingly,the dynamics of solitons can be modulated by varying the radius of the *** presented results illustrate the potential to utilize the MNP-microcavity complex for light manipulation,as well as to guide the design of photon switch and on-chip photon architecture.

关键词： nanoparticle-microcavity Hamiltonian structures soliton and rational solutions

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Isolation and biological analysis of tumor stem cells from pancreatic adenocarcinoma

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World Journal of Gastroenterology 2008年第24期14卷 3903-3907页

作者： Peng Huang Chun-YouWang Shan-Miao Gou He-shui Wu tao Liu Jiang-Xin Xiong Department of PancreaticSurgery Union Hospital Tongji Medical College HuazhongUniversity of Science and Technology Wuhan 430022 HubeiProvince China

AIM: To explore the method of isolation and biological analysis of tumor stem cells from pancreatic adenocarcinoma cell line PANC-1. METHODS: The PANC-1 cells were cultured in Dulbecco modified eagle medium F12 (1:1 volume) (DMEM-F12) supplemented with 20% fetal bovine serum (FBS). Subpopulation cells with properties of tumor stem cells were isolated from pancreatic adenocarcinoma cell line PANC-1 according to the cell surface markers CD44 and CD24 by flow cytometry. The proliferative capability of these cells in vitro were estimated by 3-[4,5-dimehyl-2-thiazolyl]-2,5-diphenyl-2H-tetrazolium bromide (MTT) method. And the tumor growth of different subpopulation cells which were injected into the hypodermisof right and left armpit of nude mice was studied,and expression of CD44 and CD24 of the CD44+CD24+ cell-formed nodules and PANC-1 cells were detected by avidin-biotin-peroxidase complex (ABC) immunohistochemical staining. RESULTS: The 5.1%-17.5% of sorted PANC-1 cells expressed the cell surface marker CD44,57.8% -70.1% expressed CD24,only 2.1%-3.5% of cells were CD44+ CD24+. Compared with CD44-CD24-cells,CD44+CD24+ cells had a lower growth rate in vitro. Implantation of 104 CD44-CD24-cells in nude mice showed no evidenttumor growth at wk 12. In contrast,large tumors were found in nude mice implanted with 103 CD44+CD24+ cells at wk 4 (2/8),a 20-fold increase in tumorigenic potential (P < 0.05 or P < 0.01). There was no obvious histological difference between the cells of the CD44+CD24+ cell-formed nodules and PANC-1 cells. CONCLUSION: CD44 and CD24 may be used as the cell surface markers for isolation of pancreatic cancer stem cells from pancreatic adenocarcinoma cell line PANC-1. Subpopulation cells CD44+CD24+ have properties of tumor stem cells. Because cancer stem cells are thought to be responsible for tumor initiation and its recurrence after an initial response to chemotherapy,it may be a very promising target for new drug development.

关键词： Pancreatic tumor Stem cells Tumor stemcells Isolation Identification

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Carbon and nitrogen stable isotope analyses of mammal bone fossils from the Zhongba site in the Three Gorges Reservoir region of the Yangtze River,China

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Chinese Science Bulletin 2011年第2期56卷 169-178页

作者： TIAN XiaoSi ZHU Cheng SUN ZhiBin shui tao HUANG YunPing FLAD Rowan Kimon LI YuMei The Department of History of Nanjing University Nanjing 210093 China Department of Tourism of Chizhou College Chizhou 247100 China School of Geographic and Oceanographic Sciences of Nanjing University Nanjing 210093 China Institute of Cultural Relics and Archaeology Chengdu 610041 China Faculty of Archaeology and Museology Peking University Beijing 100871 China Department of Anthropology Peabody Museum Harvard University Cambridge MA 02138 USA Graduate University of Chinese Academy of Sciences Beijing 100049 China

Based on AMS 14 C dating data,carbon and nitrogen isotope analyses were conducted on mammal bone collagen of deer,cattle and pigs from the Zhongba site in the Three Gorges Reservoir region of the Yangtze *** analyses were conducted to reconstruct palaeodiets of mammals,palaeoecology,palaeoenviroment and previous human activities in the study *** show that the collagen loss of bone did not change the in vivo isotopic composition of carbon and nitrogen stable isotopes,and most of the bone fossils were well *** bone collagen of samples from deer had a mean δ 13 C of-23.1‰ and a mean δ 15 N of 4.7‰,suggesting that deer subsisted in a closed habitat and fed on branches and *** bone collagen of cattle had a mean δ 13 C of-19.6‰ and a mean δ 15 N of 5.2‰,which indicates that cattle subsisted in an open habitat and fed on grasses and *** δ 13 C values show that both deer and cattle fed on C 3 plants and lived in the same ecosystem,but the t-test results show that deer δ 13 C and δ 15 N values were both more negative than those of cattle,indicating that they inhabited different *** δ 13 C and δ 15 N values of cattle partially overlapped those of deer,suggesting some competition in diets between *** t-tests show that the δ 13 C and δ 15 N values of pigs were more positive than those of cattle and deer,which signifies that pigs occupied a higher trophic level compared to cattle and *** wide range of pig δ 13 C values demonstrates that pig trading had been taking place from early Neolithic Age to late Bronze *** were no significant differences in deer δ 13 C and δ 15 N values among different archaeological periods,making it clear that climatic,ecological and environmental conditions were kept relatively stable from 2200 to 4200 a *** stability may have been responsible for the extensive and complete cultural layers at the Zhongba *** minimum number of samples required to estimate the mean δ 13 C values of d

关键词：碳稳定同位素长江中下游地区中坝遗址哺乳动物三峡库区动物骨骼化石中国地区氮

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Diets, eco-environments and seasonal variations recorded in the oxygen and carbon isotopic compositions of mammal tooth enamel from the Shunshanji site,Sihong County,Jiangsu Province,China

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Chinese Science Bulletin 2013年第30期58卷 3788-3795页

作者： TIAN XiaoSi ZHU Cheng shui tao HUANG YunPing The Department of History of Nanjing University Chizhou College School of Geographic and Oceanographic Sciences of Nanjing University Faculty of Archaeology and Museology Peking University

The carbon and oxygen isotopic compositions of the tooth enamel of mammals,including deer,wild pigs,buffaloes and domesticated pigs from the Shunshanji site,Sihong County,Jiangsu Province,China,were analyzed to reconstruct the mammals’ecoenvironments and diets,and to evaluate seasonal variations in the study *** isotopic compositions of buck samples revealed that the deer ate completely C3 plants and the environments they inhabited were relatively open and that wild pigs ate primarily C3 *** isotopic compositions indicated that the body sources of these two mammals were different,*** deer and pigs lived in different niches within a relatively similar *** domesticated pigs were isotopically more positive than the ancient wild pigs in carbon 13C values,suggesting the former ingested more C3 plants relative to the *** the 18O data showed modern domesticated and ancient pigs had similar oxygen isotope compositions,their water sources were *** carbon and oxygen isotopic patterns of premolar microsamples of ancient and modern buffaloes indicated that the plants ingested by the ancient buffalo varied with seasonal shifts,but plants ingested by the modern buffalo were relatively *** eco-environment of the modern buffalo was more open,warmer and drier than eco-environment of the ancient buffalo,which may be the result of the deforestation and other human *** and modern seasonal changes were clearly recorded in the isotopic patterns and the seasonal variation amplitudes of the ancient and modern eco-environments were similar.

关键词：碳同位素组成氧同位素组成生态环境哺乳动物季节变化泗洪县江苏省饮食

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Implementation of gastrointestinal function protection in severe acute pancreatitis

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Hepatobiliary & Pancreatic Diseases International 2024年第5期23卷 521-522页

作者： Fu-Zheng tao Rong-Lin Jiang shui-Fang Jin Intensive Care Unit Taizhou Integrated Traditional Chinese and Western Medicine HospitalTaizhou 310075China Intensive Care Unit the First Affiliated Hospital of Zhejiang Chinese Medical University(Zhejiang Provincial Hospital of Chinese Medicine)Hangzhou 310006China

Severe acute pancreatitis(SAP)is a serious systemic disease associated with strong local inflammatory reactions and serious systemic pathophysiological disorders caused by trypsin *** with SAP are prone to exhibit gastrointestinal ***,gastrointestinal dysfunction further aggravates the systemic inflammatory response and metabolic abnormalities,resulting in a more critical condition of *** dysfunction is considered to be the“trigger”of multiple organ dysfunction syndrome[1].Thus,it is important to maintain gastrointestinal homeostasis in the treatment of SAP.

关键词： gastrointestinal pancreatitis acute

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