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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： TOPOLOGY PRISONER'S dilemma game PHYSICS research SELFISHNESS COEVOLUTION

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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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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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西域史前文明发展的若干理论问题

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西域研究 2005年第4期 44-51页

作者：水涛南京大学历史系

本文对涉及西域史前文明发展的理论问题进行了讨论,指出,西域史前文明的发展演变在于不断接受来自于周边地区古代文明中心的影响作用,同时,也受到环境因素的极大制约。它的主要特点表现为农业文化与畜牧业文化的长期共存发展和相互借鉴... 详细信息

本文对涉及西域史前文明发展的理论问题进行了讨论,指出,西域史前文明的发展演变在于不断接受来自于周边地区古代文明中心的影响作用,同时,也受到环境因素的极大制约。它的主要特点表现为农业文化与畜牧业文化的长期共存发展和相互借鉴。草原游牧文化的不断南下和东进,是造成大范围文化传播和人群迁移活动的主要动因,新疆地区则是连接东西方古代文明的桥梁和纽带。

关键词：西域史前文明理论问题

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新疆史前考古学术研讨会综述

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西域研究 2008年第4期 98-101页

作者：水涛南京大学历史系

按照《新疆通史》编委会的统一部署，2008年8月2～3日，在新疆乌鲁木齐市召开了“新疆史前考古学术研讨会”，这是《新疆通史》计划组织的系列学术研讨会的第一个会议。本次会议邀请了中国科学院古脊椎动物与古人类研究所、中国社会科... 详细信息

按照《新疆通史》编委会的统一部署，2008年8月2～3日，在新疆乌鲁木齐市召开了“新疆史前考古学术研讨会”，这是《新疆通史》计划组织的系列学术研讨会的第一个会议。本次会议邀请了中国科学院古脊椎动物与古人类研究所、中国社会科学院考古研究所、北京大学、中国人民大学、北京科技大学、北京联合大学、吉林大学、南京大学、南京师范大学、四川大学、西北大学、新疆师范大学、甘肃省文物考古研究所、新疆维吾尔自治区文物考古研究所、新疆社科院民族所、新疆维吾尔自治区文物局、新疆吐鲁番学研究院等单位的专家和学者共30余人到会。

关键词：新疆师范大学学术研讨会史前考古研讨会综述文物考古研究所新疆维吾尔自治区中国社会科学院中国人民大学

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Dominant Factors on the Early Hydration of Metakaolin-Cement Paste

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Journal of Wuhan University of Technology(Materials Science) 2010年第5期25卷 849-852页

作者：水中和 School of Materials Science and Engineering Wuhan University of Technology

The dominant factors during early hydration process of cement paste containing 10% metakaolin replacement （MK10） and 10% kaolin replacement （K10） are investigated in comparison to neat cement paste （NCP）, and X-ray Diffraction （XRD） analysis is employed to identify the crystalline phases of all specimens. Thermogravimetric （TG） and Differential Scanning Calorimetry （DSC） are used to identify the phase constituents. The amount of acid-insoluble residue （AIR） of all specimens is used to evaluate the unreacted materials. The results indicate that, after the first day, MK act as nuclei for the formation of C-S-H during hydration of C3S and C2S, densifying the microstructure of cement paste. Its contribution is mainly due to the fine nature of the MK. From 3 days to 7 days, more and more MK reacts with CH to form C-S-H, making the microstructure denser. The strength contribution is mainly due to the chemical activity of MK.

关键词： metakaolin (MK) hydration dominant factor cement paste

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风水联合冷却冷渣器的运行

引用

锅炉技术 2006年第1期37卷 59-62页

作者：水涛山东华能济宁电厂山东济宁272121

结合华能济宁电厂风水联合冷却冷渣器结构特点及工作原理,根据实际工作经验,就冷渣器的各种工况条件下的运行调整、异常现象的处理进行了阐述。

关键词：循环流化床冷渣器排渣运行

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