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Decomposing significant factors of Coulomb stress and its components in injection-induced seismicity

JOURNAL OF ROCK MECHANICS AND GEOTECHNICAL ENGINEERING 2024年第12期16卷 4895-4908页

作者： Zhang, Yao Li, Qi tan, Yongsheng Li, Xiaying Zhong, Yiyan Chinese Acad Sci Inst Rock & Soil Mech State Key Lab Geomech & Geotech Engn Wuhan 430071 Peoples R China Univ Chinese Acad Sci Beijing 100049 Peoples R China

Injection-induced seismicity has been a focus of industry for decades as it poses great challenges to the associated risk mitigation and hazard assessment. The response surface methodology is integrated into the geo-mechanical model to analyze the effects of multiple factors on induced seismicity during the post shut-in period. We investigate the roles of poroelastic stress and pore pressure diffusion and examine the differences in the controlling mechanism between fault damage zones and the fault core. A sensitivity analysis is conducted to rank the selected factors, followed by a Box-Behnken design to form response surfaces and formulate prediction models for the Coulomb stress and its components. Reservoir properties significantly affect the potentials of induced seismicity in the fault by changing pore pressure diffusion, which can be influenced by other factors to varying degrees. Coulomb stress is greater in pressurized damage zones than in fault cores, and the seismicity rate exhibits a consistent variation. Poroelastic stress plays a similar role to pore pressure diffusion in the stability of the fault within the pressurized damage zones. However, pore pressure diffusion dominates in the fault core due to the low rigidity, which limits the accumulation of elastic energy caused by poroelastic coupling. The slip along the fault core is a critical issue to consider. The potential for induced seismicity is reduced in the right damage zones as the pore pressure diffusion is blocked by the low-permeability fault core. However, poroelastic stressing still occurs, and in deep basements, the poroelastic effect is dominant even without a direct increase in pore pressure. The findings in this study reveal the fundamental mechanisms behind injection-induced seismicity and provide guidance for optimizing injection schemes in specific situations. (c) 2024 Institute of Rock and Soil Mechanics, Chinese Academy of Sciences. Published by Elsevier B.V. This is an open access a

关键词： Injection-induced seismicity Poroelastic coupling Response surface Coulomb stress

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Adaptive Algorithms of Nonlinear Approximation with Finite Terms

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Acta Mathematica Sinica,English Series 2007年第9期23卷 1663-1672页

作者： Wen Bin WEI Yue sheng XU Pei Xin YE Department 4 Air Force Radar Academy Wuhan 430019 P. R. China Institute of Mathematics Chinese Academy of Sciences Beijing 100080 P. R. China Department of Mathematics Nankai University Tianjin 300000 P. R. China

This paper deals with realizable adaptive algorithms of the nonlinear approximation with finite terms based on wavelets. We present a concrete algorithm by which we may find the required index set Am for the greedy algorithm Gm^P（., Ψ）. This makes the greedy algorithm realize the near best approximation in practice. Moreover, we study the efficiency of the finite-term approximation of another Mgorithm introduced by Birge and Massart.

关键词： nonlinear approximation dictionary Haar system adaptive algorithm near best approximation

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Estimation and test of restricted linear EV model with nonignorable missing covariates

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Applied Mathematics(A Journal of Chinese Universities) 2018年第3期33卷 344-358页

作者： tanG Lin-jun ZHENG sheng-chao ZHOU Zhan-gong Department of Statistics Jiaxing University

This paper deals with estimation and test procedures for restricted linear errors-invariables(EV) models with nonignorable missing covariates. We develop a restricted weighted corrected least squares(WCLS) estimator based on the propensity score, which is fitted by an exponentially tilted likelihood method. The limiting distributions of the proposed estimators are discussed when tilted parameter is known or unknown. To test the validity of the constraints,we construct two test procedures based on corrected residual sum of squares and empirical likelihood method and derive their asymptotic properties. Numerical studies are conducted to examine the finite sample performance of our proposed methods.

关键词： errors-in-variables model nonignorable missing data propensity score smoothed empirical likelihood

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A Two-layer Framework for Mitigating the Con-gestion of Urban Power Grids Based on Flexible Topology with Dynamic Thermal Rating

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Protection and Control of Modern Power Systems 2024年第4期9卷 83-95页

作者： Yi Su Jiashen Teh Qian Luo Kangmiao tan Jiaying Yong the School of Automation and Electronic In-formation Xiangtan Universityxiangtan 411100China IEEE the School of Electrical and Electronic Engineering Universiti Sains Malaysia(USM)Penang 11800Malaysia the School of Computer Sciences Universiti Sains Malaysia(USM)Penang 11800Malaysia the Institute of Power Engineering College of EngineeringUniversiti Tenaga Nasional(UNITEN)Kajang 43000Malaysia

The urban power grid(UPG)combines transmission and distribution *** studies on UPG congestion mitigation have primarily focused on relieving local congestion while ignoring large-scale energy transfer with safety margins and load *** situation is expected to worsen with the proliferation of renewable energy and electric *** this paper,a two-layer congestion mitigation framework is proposed,one which considers the congestion of the UPG with flexible *** the upper-layer,the particle swarm optimization algorithm is employed to optimize the power supply distribution(PSD)of substation *** is known as the upper-layer *** lower-layer model recalculates the new PSD,known as the lower-layer PSD,based on the topology candidates.A candidate topology is at an optimum when the Euclidean distance mismatch between the upper-and lower-layer PSDs is the *** optimum topology is tested by standard power flow to ascertain its *** optimum transitioning sequence between the initial and optimum topologies is also determined by the two-layer framework to minimize voltage deviation and line overloading of the UPG considering dynamic thermal *** proposed framework is tested on a 56-node test *** show that the proposed framework can significantly reduce congestion,maintain safety margins,and determine the optimum transitioning sequence.

关键词： Congestion mitigation urban power grid two-layer framework transitioning sequence dynamic thermal rating

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2T-PERIODIC SOLUTION FOR m ORDER NEUTRAL TYPEDIFFERENTIAL EQUATIONS WITH TIME DELAYS

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Applied Mathematics and Mechanics(English Edition) 2002年第1期23卷 100-106页

作者： ZHANG Bao-sheng(张保生) ZHU Guang-hui(朱光辉) Department of Mathematics Yunnan Nationalities InstituteKunming 650031 P R China Department of Mathematics Yunnan Nationalities InstituteKunming 650031 P R China

Periodic solution of m order linear neutral equations with constant coefficient and time delays was studied. Existence and uniqueness of 2 T-periodic solutions for the equation were discussed by using the method of Fourier series. Some new necessary and sufficient conditions of existence and uniqueness of 2 T-periodic solutions for the equation are obtained. The main result is used widely. It contains results in some correlation paper for its special case, improves and extends the main results in them. Existence of periodic solution for the equation in larger number of particular case can be checked by using the result, but cannot be checked in another paper. In other words, the main result in this paper is most generalized for (1) the better result cannot be found by using the same method.

关键词： neutral type equation 2T-periodic solution Fourier series

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Identification,localization and morphology of APUD cells in gastroenteropancreatic system of stomach-containing teleosts

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World Journal of Gastroenterology 2000年第6期6卷 842-847页

作者： Qian sheng Pan Zhi Ping Fang Feng Jie Huang College of Fisheries Huazhong Agricultural UniversityWuhan 430070Hubei ProvinceChina College of Animal Husbandry and Veterinary Medicine Huazhong Agricultural UniversityWuhan 430070Hubei ProvinceChina

AIM To identify the type localization andmorphology of APUD endocrine cells in thegastroenteropancreatic(GEP)system ofstomach-containing teleosts,and study APUDendocrine system in the stomach,intestine andpancreas of fish *** Two kinds of immunocytochemical(ICC)techniques of the streptavidin biotin-peroxidase complex(SABC)and streptavidin-peroxidase(S-P)method were ***,localization and morphology ofAPUD endocrine cells scattered in the mucosa ofdigestive tract,intermuscular nerve plexus andglandular body of northern snakehead(Channaargus),ricefield eel(Monopterus albus),yellow catfish(Pelteobagrus fulvidraco),mandarinfish(Siniperca chuatsi),largemouthbass(Micropterus salmoides),orientalsheatfish(Silurus asotus),freshwater pomfret(Colossoma brachypomum)and nile tilapia(Tilapia nilotica)were investigated with 8 kindsof *** The positive reaction of 5-hydroxytryptamine(5-HT)immunoreactiveendocrine(IRE)cells was found in the digestive tract and glandular body of 8 fish species indifferent *** a few gastrin(GAS)-IREcells were seen in ***,*** and ***(GLU)-IRE cells were notfound in the digestive tract and glandular bodybut existed in pancreatic island of most *** positive reaction of growthhormone(GH)-IRE cells was found only inpancreatic island of *** and ***,no positive reaction in the other 6 fish ***(SOM)-,calcitonin(CAL)-,neurofilament(NF)-and insulin(INS)-IRE cellsin the stomach,intestine and pancreas of 8 kindsof fish were different in distribution and *** distribution of all 8 APUD cells was the mostin gastrointestinal epithelium mucosa and then indigestive *** positive reaction of SOM-and 5-HT-IRE cells was found in intermuscularnerve plexus of intestine of *** *** GH-IRE cells were denselyscattered in the pancreatic islands of *** ***,and odd distribution in thepancreas of ***,SOM-IRE cells we

关键词： stomach-containing teleosts gastroenteropancreatic system APUD cells immunocytochemistry

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New advances in small molecule hole-transporting materials for perovskite solar cells

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Chinese Chemical Letters 2016年第8期27卷 1293-1303,1469页

作者： Ya-Kun Wang Zuo-Quan Jiang Liang-sheng Liao Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices Institute of Functional Nano & Soft Materials (FUNSOM) Soochow University

Organic π-functional molecules are the foundation and basic component of organic optoelectronic *** example,for ideal carrier transporting materials,extended π-conjugation and ordered π-πstacking are necessary to enhance the charge mobility and achieve desirable *** a promising way to convert sunlight into electricity,organometal halide perovskite solar cells（PSCs） have captured a lot of attention due to its predominant merits especially in the aspect of remarkable photovoltaic performance and much potentially low production *** conventional planar PSC structure,hole-transporting layer which typically consists of organic π-functional materials plays a key role in suppressing holeelectron pair recombination,promoting charge transporting and ensuring ohmic contact of back *** the key roles of HTMs and its soaring progress in recent years,here,we will summarize recent progress in small organic π-functional materials from its diverse functions in ***,aiming to further promote the development of organic π-functional molecules and HTMs,a promising direction toward highly efficient HTMs will also be discussed.

关键词： Perovskite solar cell Photovoltaic device Small molecule Conjugated structure Hole-transporting material

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Dynamic stability and manipulation of bright matter-wave solitons by optical lattices in Bose-Einstein condensates

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Chinese Physics B 2012年第2期21卷 98-106页

作者： Song Chang-sheng Li Jing Zong Feng-De Institute of Nonlinear Physics Zhejiang Normal UniversityJinhua 321004China

An extended variation approach to describing the dynamic evolution of self-attractive Bose-Einstein condensates is developed. We consider bright matter-wave solitons in the presence of a parabolic magnetic potential and a timespace periodic optical lattice. The dynamics of condensates is shown to be well approximated by four coupled nonlinear differential equations. A noteworthy feature is that the extended variation approach gives a critical strength ratio to support multiple stable lattice sites for the condensate. We further examine the existence of the solitons and their stabilities at the multiple stable lattice sites. In this case, the analytical predictions of Bose-Einstein condensates variational dynamics are found to be in good agreement with numerical simulations. We then find a stable region for successful manipulating matter-wave solitons without collapse, which are dragged from an initial stationary to a prescribed position by a moving periodic optical lattice.

关键词： Bose-Einstein condensates Gross-Pitaevskii equation matter-wave solitons controlled manipulation

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Emergence of machine language: towards symbolic intelligence with neural networks

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National Science Review 2024年第4期11卷 27-30页

作者： Yuqi Wang Xu-Yao Zhang Cheng-Lin Liu Tieniu tan Zhaoxiang Zhang State Key Laboratory of Multimodal Artificial Intelligence Systems Institute of AutomationChinese Academy of Sciences

Representation learning is a core issue in artificial intelligence (AI). Currently,there exists a disparity in the choice of representation between humans and machines. Humans rely on discrete language for communicati... 详细信息

关键词： intelligence emergence language with machine networks neural symbolic towards

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Economic Analysis of using Above Ground Gas Storage Devices for Compressed Air Energy Storage System

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Journal of Thermal Science 2014年第6期23卷 535-543页

作者： LIU Jinchao ZHANG Xinjing XU Yujie CHEN Zongyan CHEN Haisheng tan Chunqing Institute of Engineering Thermophysics Chinese Academy of Sciences University of Chinese Academy of Sciences

Above ground gas storage devices for compressed air energy storage(CAES) have three types:air storage tanks,gas cylinders,and gas storage pipelines.A cost model of these gas storage devices is established on the basis of whole life cycle cost(LCC) *** optimum parameters of the three types are determined by calculating the theoretical metallic raw material consumption of these three devices and considering the difficulties in manufacture and the influence of gas storage device *** LCCs of the three types are comprehensively analyzed and *** result reveal that the cost of the gas storage pipeline type is lower than that of the other two *** study may serve as a reference for designing large-scale CAES systems.

关键词： above ground gas storage device economic analysis life cycle cost analysis

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