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Relationship between fracture spacing and bed thickness in sedimentary rocks:Approach by means of Michaelis-Menten equation

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Journal of Rock Mechanics and Geotechnical Engineering 2023年第8期15卷 1924-1930页

作者： Shaocheng ji Département des Génies Civil Géologique et des MinesÉcole Polytechnique de MontréalMontréalQuébecH3C 3A7Canada

Fractures occur in nearly all rocks at the Earth’s surface and exert essential control on the mechanical strengths of rock masses and *** fractures strongly impact the stability of geological or man-made structures and flow of water and hydrocarbons,CO_(2) and storing *** this,the dependence of opening mode fracture spacing(s)on bed thickness(t)in sedimentary basins(reservoirs)is studied in this *** paper shows that the MichaeliseMenten equation can provide an algebraic expression for the nonlinear s-t *** two parameters have clear geological meanings:a is the maximum fracture spacing which can no longer increase with increasing t,and b is the characteristic bed thickness when s=*** tensile fracture strength(C)of the brittle beds during the formation of tensile fractures can be estimated from the two *** sandstones of 16 areas reported in the literature,C ranges from 2.7 MPa to 15.7 MPa with a mean value of 8 MPa,which lies reasonably within the range of tensile strengths determined *** field-based approach by means of MichaeliseMenten equation provides a new method for estimating the tensile fracture strength of rock layers under natural conditions.

关键词： Fracture spacing Sedimentary rocks Michaelisementen equation Tensile fracture strength Rock fracture mechanics

Proton mass decomposition:Naturalness and interpretations

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Frontiers of physics 2021年第6期16卷 83-92页

作者： Xiangdong ji Center for Nuclear Femtography SURA1201 New York Ave.NWWashingtonDC 20005USA Department of Physics University of MarylandCollege ParkMD 20742USA

Idiscuss the scope and naturalness of the proton mass decomposition(or sum rule)published in ***.74,1071(1995)and answer a few criticisms that appeared recently in the literature,focusing particularly on its interpret... 详细信息

关键词： mass decomposition quantum

Light People: Professor Fanglin Bao and his cover story

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Light(Science & Applications) 2024年第6期13卷 1015-1020页

作者： ji Wang School of Science Westlake UniversityHangzhouZhejiangPR China

Qu Yuan,a renowned ancient Chinese poet,once pondered in his work Heavenly Inquiry:“If the sun’s light is absent,from where does the radiance of the Hero Flower emanate?”The ability to see clearly in the darkest of nights has long been a sought-after magical power by *** holds not only immense technological significance for computer vision and remote sensing but also profound implications for transcending the dichotomy between day and night in our daily *** Fanglin Bao from Westlake University has made significant breakthroughs in this field,bringing us closer to a world where we can transform night into *** groundbreaking research on Heat-Assisted Detection and Ranging(HADAR)and night vision was featured as the cover story in Nature on July 26,2023.

关键词： bringing breakthrough holds

An Explosive Organic/Inorganic Hybrid: Synthesis and Thermal Property of Octa(2,4-dinitrophenyl)silsesquioxane

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Chemical Research in Chinese Universities 2004年第1期20卷 42-45页

作者： CHENHong-ji DepartmentofChemistry JinanUniversityGuangzhou510632P.R.China

Octaphenylsilsesquioxane(OPhS) was prepared by a modifying method and a new core-shell nanocomposite, octa(2,4-dinitrophenyl)silsesquioxane, [(R_2PhSiO_ 1.5)_8, R=—NO_2, ODNPhS], was synthesized by nitration of OPhS in a mixed acid solution of nitric and sulfuric acids at about 60 ℃. Their molecular structures were determined by DRIFTS, 1H NMR, 13C NMR spectra analysis. The thermal analysis shows that ODNPhS is an explosive that detonates at about 420 ℃.

关键词： Core-shell nanocomposite Organic/inorganic hybrid Octa(2,4-dinitrophenyl)silsquioxane Thermal property

Orbital Stability of Peakons for the Modified Camassa–Holm Equation

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Acta Mathematica Sinica,English Series 2022年第1期38卷 148-160页

作者： ji LI School of Mathematics and Statistics Huazhong University of Science and TechnologyWuhan 430074P.R.China

In this paper,we investigate the orbital stability of the peaked solitons(peakons)for the modified Camassa–Holm equation with cubic *** consider a minimization problem with an appropriately chosen constraint,from whi... 详细信息

关键词： Stability peaked solitary waves modified Camassa–Holm equation variational problem concentration compactness

Strain and stress analysis on Zn multicrystal film by XRD method

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中国有色金属学会会刊：英文版 2006年第B02期16卷 735-738页

作者： Vincent ji LIM UMR CNRS8006ENSAM 151Boulevard de I'Hopital75013 ParisFrance

A new method was denonstrated to determine stress in a single crystal for multicrystal material and this new method could be specially applied for any symmetric crystalline systems. The strain tensor e was determined by the change of the metric tensor G before the initial state and after the deformed state in the crystal reference system. Then stress tensor at grain scale was calculated by the HOOK's law. The stress evaluations were carried out in coarse grains of a thin galvanized coating on a steel substrate during tensile loading. This makes it possible to link the microstructure evolution to the elastic heterogeneity at grain scale or between the grains.

关键词：锌多晶膜单晶应力应变分析 XRD法锌镀层

Challenges and opportunities facing game theory and control: an interview with Tamer Ba?ar

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National Science Review 2020年第7期7卷 1142-1146页

作者： ji-Feng Zhang the Academy of Mathematics and Systems Science of the Chinese Academy of Sciences

The Control community has recently witnessed an almost exponentially growing interest in the application of game-theoretic concepts and tools in research on control, multi-agent systems, and networks. In an interview with NSR, Professor Tamer Ba?ar, a member of the US National Academy of Engineering, Swanlund Endowed Chair and CAS Professor of Electrical and Computer Engineering, and Director of the Center for Advanced Study at the University of Illinois at Urbana-Champaign in the USA, former president of both the IEEE Control

关键词： Game theory

Pilot study on bromate reduction in ozonation of water with low carbonate alkalinities by carbon dioxide

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Journal of Environmental Sciences 2011年第9期23卷 1491-1496页

作者： ji Li Li Zou Lulu Guo jialin ji Harbin Institute of Technology Shenzhen Graduate School Shenzhen 518055 China

A pilot study was carried out to explore the application of carbon dioxide for pH depression in a bubble column and its ability to inhibit bromate formation for water with a low *** showed that in the absence of ammonia,CO 2 was capable of reducing bromate 38.0%–65.4% with one-unit pH *** 2 caused a slightly lower bromate reduction （4.2%） than did H 2 SO 4 when the pH was depressed to 7.4,and a more a pronounced lower reduction （8.8%） when the pH was depressed to *** the presence of 0.20 mg/L-N ammonia,bromate was largely inhibited with 73.9% *** the pH was depressed to 7.4,CO 2 and H 2 SO 4 showed an 11.3% and 23.5% bromate reduction respectively,demonstrating that the joint use of CO 2 and ammonia might be a plausible strategy of blocking all three bromate formation *** 2 could be applied through the aeration diffuser together with ozone gas,resulting in a similar bromate reduction compared with the premixing method through Venturi mixer.

关键词： ozone bromate carbon dioxide

Seismic hazard level reduction for existing buildings considering remaining building lifespans

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Earthquake Engineering and Engineering Vibration 2019年第3期18卷 649-661页

作者： ji-Hun Park Division of Architecture and Urban Design Incheon National University

Seismic hazard levels lower than those for design of new buildings have been permitted for seismic evaluation and retrofi t of existing buildings due to the relatively short remaining lifespans. The seismic hazard reduction enables costeff ective seismic evaluation and retrofi t of existing buildings with limited structural capacity. The current study proposes seismic hazard reduction factors for Korea, one of low to moderate seismicity regions. The seismic hazard reduction factors are based on equal probabilities of non-exceedance within diff erent remaining building lifespans. A validation procedure is proposed to investigate equality of seismic risk in terms of ductility-based limit states using seismic fragility assessment of nonlinear SDOF systems, of which retrofi t demands are determined by the displacement coeffi cient method of ASCE 41-13 for diff erent target remaining building lifespans and corresponding reduced design earthquakes. Validation result shows that the use of seismic hazard reduction factors can be permitted in conjunction with appropriate lower bounds of the remaining building lifespans.

关键词： seismic hazard level existing building remaining building lifespan probability of limit state