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Probing multi-physical process and deformation mechanism of a largescale landslide using integrated dual-source monitoring

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Geoscience Frontiers 2024年第2期15卷 417-432页

作者： Hong-Hu Zhu Xiao Ye Hua-Fu Pei Wei Zhang Gang Cheng Zi-Li Li School of Earth Sciences and Engineering Nanjing UniversityNanjing 210023China Department of Geotechnical Engineering Dalian University of TechnologyDalian 116024China Civil Structural&Environmental EngineeringSchool of Engineering and ArchitectureUniversity College CorkCorkIreland Department of Civil&Environmental Engineering Massachusetts Institute of TechnologyCambridgeMA 02139-4307United States

The implementation of isolated heterologous monitoring systems for spatially distant borehole deployments often comes with substantial equipment costs,which can limit the effectiveness of geohazard mitigation and georisk management *** address this,we have developed a novel monitoring system that integrates fiber Bragg grating(FBG)and microelectromechanical system(MEMS)techniques to capture soil moisture,temperature,sliding resistance,strain,surface tilt,and deep-seated *** system enables real-time,simultaneous data acquisition and cross-validation analyses,offering a costeffective solution for monitoring critical parameters in geohazard-prone *** successfully applied this integrated monitoring system to the Xinpu landslide,an active super-large landslide located in the Three Gorges Reservoir Area(TGRA)of *** resulting strain profile confirmed the presence of two shallow secondary sliding surfaces at depths of approximately 7 m and 12 m,respectively,in addition to the deep-seated sliding surface at a depth of28 *** lower secondary sliding surface was activated by extreme precipitation,while the upper one was primarily driven by significant changes in reservoir water levels and secondarily triggered by concentrated ***-slide piles have remarkably reinforced the upper moving masses but failed to control the lower *** gap between the pile heads and the soil amplified the rainwater erosion effect,creating a preferential channel for rainwater ***-physical measurements revealed a mixture of seepage-driven and buoyancy-driven behaviors within the *** study offers an integrated dual-source multi-physical monitoring paradigm that enables collaborative management of multiple crucial boreholes on a large-scale landslide,and contributes to the evaluation and improvement of engineering measures in similar geological settings.

关键词： Reservoir landslide Multi-physical process Integrated dual-source monitoring Fiber optic Extreme weather

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Diversity of Idea Flows and Economic Growth

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Journal of Social Computing 2020年第1期1卷 71-81页

作者： Alex Pentland Institute of Technology(MIT) CambridgeMA 02139-4307USA

What role does access to diverse ideas play in economic growth?New forms of geo-located communications and economic data allow measurement of human interaction patterns and prediction of economic outcomes for individuals,communities,and nations at a fine granularity,with the strongest predictors of income,productivity,and growth being measures of diversity and frequency of physical interaction between communities(clusters of interaction).This finding provides both new investment opportunities and new methods of risk *** and use of these data raise privacy and security risks,and the final section of the paper describes how these challenges can be controlled.

关键词： idea flow opportunity wealth inequality segregation foraging privacy policy

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Moduli of Polarized Calabi–Yau Pairs

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Acta mathematica Sinica,English Series 2020年第6期36卷 631-637页

作者： János KOLLáR Chen Yang XU Princeton University Princeton NJ 08544-1000USA MIT CambridgeMA 02139-4307USA

We prove that the irreducible components of the moduli space of polarized Calabi–Yau pairs are projective.

关键词： Polarized Calabi–Yau stable pairs Moduli spaces

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On the character of certain tilting modules

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Science China mathematics 2018年第2期61卷 295-298页

作者： George Lusztig Geordie Williamson Department of mathematics Massachusetts Institute of Technology Cambridge MA 02139-4307 USA max Planck Institut fur mathematik Bonn 53111 Germany

Let G be a semisimple group over an algebraically closed field of characteristic p > 0. We give a(partly conjectural) closed formula for the character of many indecomposable tilting rational G-modules assuming that p ... 详细信息

关键词： semisimple group tilting module character formula

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WEIERSTRASS POLYNOMIALS AND PLANE PSEUDO-HOLOMORPHIC CURVES

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Chinese Annals of mathematics,Series B 2002年第1期23卷 1-10页

作者： B.SIEBERT TIANGANG Fakultaetfürmathematik Ruhr-UniversitaetBochumD-44780BochumGermany Departmentofmathematics MITCambridgeMA02139-4307U.S.A Instituteofmathematics PekingUniversityBeijing100871

For an almost complex structure J on U R4 pseudo-holomorphically fibered over C a J-holomorphic curve C U can be described by a Weierstrass polynomial. The J-holomorphicity equation descends to a perturbed 8-operator on the coefficients; the operator is typically (0, 2/m)-Holder continuous if m is the local degree of C over C. This sheds some light on the problem of parametrizing pseudo-holomorphic deformations of J-holomorphic curve singu-larities.

关键词： Weierstrass polynomials Plane pseudo-holomorphic curves

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Cormorant Webbed-feet Support Water-surface Takeoff:Quantitative Analysis via CFD

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Journal of Bionic Engineering 2021年第5期18卷 1086-1100页

作者： Jinguo Huang Jianhong Liang Xingbang Yang Hongyu Chen Tianmiao Wang Robotics Institute Beihang UniversityBeijing 100083China Institute of Micro Technology and Medical Device Technology Technical University of Munich85748 GarchingGermany Media Lab Massachusetts Institute of TechnologyCambridgeMA 02139-4307USA

The bio-inspired aerial–aquatic vehicle off ers attractive perspectives for future intelligent robotic ***’s webbed-feet support water-surface takeoff is a typical locomotion pattern of amphibious water birds,but its highly maneuverable and agile kinetic behaviors are inconvenient to measure directly and challenging to calculate *** paper presents a numerical Computational Fluid Dynamic(CFD)technique to simulate and reproduce the cormorant's surface takeoff process by modeling the three-dimensional biomimetic *** numerical analysis of the fluid flows and hydrodynamic forces around a cormorant’s webbed feet,body,and wings are conducted,which are consistent with experimental results and theoretical *** results show that the webbed feet indeed produced a large majority of the takeoff power during the initial takeoff *** lift and greater angle of attack are generated to bring the body off the water as soon as *** the discussion of the mechanism of the cormorant’s water-surface takeoff and the relevant characteristics of biology,the impetus and attitude adjustment strategies of the aerial–aquatic vehicle in the takeoff process are illustrated.

关键词： Aerial-aquatic vehicle Cormorant’s takeoff Quantitative hydrodynamic analysis Computational Fluid Dynamics(CFD) Multiphase flow Bionic prototype verification

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Stress-state dependence of dynamic strain aging:Thermal hardening and blue brittleness

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International Journal of Minerals,Metallurgy and materials 2021年第5期28卷 854-866页

作者： Wen-qi Liu Jun-he Lian Advanced manufacturing and materials Department of Mechanical EngineeringAalto UniversityPuumiehenkuja 302150 EspooFinland Impact and Crashworthiness Lab Department of Mechanical EngineeringMassachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA 02139-4307USA

This study aims to discover the stress-state dependence of the dynamic strain aging(DSA)effect on the deformation and fracture behavior of high-strength dual-phase(DP)steel at different deformation temperatures(25-400°C)and reveal the damage mechanisms under these various *** achieve different stress states,predesigned specimens with different geometric features were *** electron microscopy was applied to analyze the fracture modes(e.g.,dimple or shear mode)and underlying damage mechanism of the investigated *** is present in this DP steel,showing the Portevin-Le Chatelier(PLC)effect with serrated flow behavior,thermal hardening,and blue brittleness *** show that the stress state contributes distinctly to the DSA effect in terms of the magnitude of thermal hardening and the pattern of blue *** low stress triaxiality or Lode angle parameter promotes DSA-induced blue ***,the damage mechanisms also show dependence on the stress states in conjunction with the DSA effect.

关键词： dynamic strain aging effect Portevin-Le Chatelier effect damage mechanism dimple fracture shear fracture dual-phase steel

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Elasticity,Strength and Resilience:A Comparative Study on Mechanical Signatures ofα-Helix,β-Sheet and Tropocollagen Domains

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Nano Research 2008年第1期1卷 63-71页

作者： markus J.Buehler Sinan Keten Laboratory for Atomistic and Molecular Mechanics Department of Civil and Environmental EngineeringMassachusetts Institute of Technology77 Massachusetts Ave.Room 1-235 A&BCambridgeMA02139-4307USA

In biology,structural design and materials engineering is unified through formation of hierarchical features with atomic resolution,from nano to *** molecular building blocks are particularly prevalent in all structural protein materials:alpha helices(AHs),beta-sheets(BSs)and tropocollagen(TC).In this article we present a comparative study of these three key building blocks by focusing on their mechanical signatures,based on results from full-atomistic simulation *** fi nd that each of the basic structures is associated with a characteristic material behavior:AH protein domains provide resilience at large deformation through energy dissipation at low force levels,BS protein domains provide great strength under shear loading,and tropocollagen molecules provide large elasticity for deformation *** suggests that AHs,BSs,and TC molecules have mutually exclusive mechanical *** correlate each of these basic properties with the molecule’s structure and the associated fundamental rupture *** study may enable the use of abundant protein building blocks in nanoengineered materials,and may provide critical insight into basic biological mechanisms for bio-inspired *** transfer towards the design of novel nanostructures could lead to new multifunctional and mechanically active,tunable,and changeable materials.

关键词： Fracture biology hierarchical materials materiomics proteins self-assembly mechanical properties theory strength

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Location choice of Chinese urban fringe residents on employment, housing, and urban services： A case study of Nanjing

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Frontiers of Architectural Research 2016年第1期5卷 27-38页

作者： Xingping Wang Pan Hu Yi Zhu Department of Architecture Southeast University Nanjing 210096 China Department of ARCH Nanjing Agricultural University Nanjing 210090 China Department of ARCH Massachusetts Institute of Technology Cambridge MA 02139-4307 USA

Urban fringe area is the most important space for city development. It inctudes several complicated elements, such as population, space, and management organization. On the basis of local population attributes in the city fringe area combined with people＇s movement characteristics in time and space, this article reclassifies basic public service facilities and discusses the relationship between facility layout and housing, employment, and commuter transportation. Through a questionnaire survey in Qiaobei District of the urban fringe area in Nanjing and on the basis of comparative analysis, we discuss the impact factor on the choice of housing, urban services, and the tolerance of commuting time. Our findings indicate mutual promoting and restricting connections among living, employment, and services. Workers＇ living situation determines their daily behavior, such as dining, shopping, and entertainment. Furthermore, different income levels have a great influence on residents＇ choices with regard to places to live and develop their careers.

关键词： Urban fringe area Employment Housing and services China

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Limit point buckling of a finite beam on a nonlinear foundation

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Theoretical & Applied Mechanics Letters 2014年第3期4卷 18-24页

作者： Romain Lagrange massachusetts Institute of Technology Department of MathematicsCambridgeMA 02139-4307 USA

In this paper, we consider an imperfect finite beam lying on a nonlinear foundation, whose dimensionless stiffness is reduced from 1 to k as the beam deflection increases. Periodic equilibrium solutions are found analytically and are in good agreement with a numerical resolution, suggesting that localized buckling does not appear for a finite beam. The equilibrium paths may exhibit a limit point whose existence is related to the imperfection size and the stiffness parameter k through an explicit condition. The limit point decreases with the imperfection size while it increases with the stiffness parameter. We show that the decay/growth rate is sensitive to the restoring force model. The analytical results on the limit load may be of particular interest for engineers in structural mechanics.

关键词： buckling imperfection finite beam nonlinear foundation limit point

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