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Short-term and impending precursor of sand layer stress in Wenchuan Earthquake

Wang Baoyu,Tong Xiaohui,Sun Xiaoming ,Sun Wei

Strategic Study of CAE 2009, Volume 11, Issue 6,   Pages 146-152

Abstract:

An earthquake preparation physical model was established based on observationdata of sand layer stress instrument in Changping and Xiji, Beijing, earthquake precursor in the past30 years observed by this instrument and precursor of Indonesia Earthquake (M =8.7) on December 26,2004.The short-term and impending precursor of Wenchuan Earthquake recorded by the sand layer stressinstrument was in accordance with this model.The observed short-term and impending abnormal stage change

Keywords： Wenchuan Earthquake     sand layer stress instrument     earthquake preparation physical model of sand layerstress     impending earthquake signal    

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Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Frontiers of Structural and Civil Engineering 2011, Volume 5, Issue 2,   Pages 121-150 doi: 10.1007/s11709-011-0104-z

Abstract: model proposed by Zhang et al. [ ].Without losing the generality of the sand, a specific sand called as Toyoura sand, a typical clean sandIn the model, the results of conventional triaxial tests of the sand under different loading and drainagemodel.The capability of the model is discussed in a theoretical way.

Keywords： constitutive model     sand     stress-induced anisotropy     density     structure    

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Destructive Earthquakes Are Predictable——The Physical Model of Earthquake Gestation and the Signal of

Sun Wei

Strategic Study of CAE 2007, Volume 9, Issue 7,   Pages 7-17

Abstract:

What is discussed here is that the earthquake precursor have their ownphysical model, which is divided into the load stage, the stage of stalemate, the unload stage, theUp till now, numerous earthquakes that occurred worldwide have proved that the quake-breeding physicalmodel of destructive earthquakes may repeat and reappear.An analytic method is brought forward for tracing the information on the warning signs of an earthquake

Keywords： destructive earthquake     quake-breeding physical model     signals before an earthquake     earthquake precursor    

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The phenomena based on the before Wenchuan Earthquake, the characteristic of large scale and deep layeron dynamic force of earthquake occurrence has been recognized

Xu Shaoxie

Strategic Study of CAE 2009, Volume 11, Issue 6,   Pages 16-18

Abstract:

The characteristic of large scale and deep layer on dynamic force ofactivity enhanced in deep layer, are important phenomena before Wenchuan Earthquake.Since particle movement cannot be easy released, it will make stress concentric and become a locationThe characteristic of lock in deep layer is not easy to find by observation at shallower earth surfaceon information of large scale and deep layer.

Keywords： Wenchuan Earthquake     the characteristic of large scale and deep layer on dynamic force of earthquakeoccurrence     earthquake prediction    

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Effects of coarse and fine aggregates on long-term mechanical properties of sea sand recycled aggregate

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 3,   Pages 754-772 doi: 10.1007/s11709-021-0711-2

Abstract: Typical effects of coarse and fine aggregates on the long-term properties of sea sand recycled aggregateTwo different types of fine (coarse) aggregates are considered: sea sand and river sand (natural andSSRAC increase with decreasing recycled coarse aggregate replacement percentage and increasing sea sandTypical axial stress–strain curves of SSRAC vary with age.Finally, an analytical expression is suggested to construct the long-term stress–strain curve of SSRAC

Keywords： sea sand recycled aggregate concrete     recycled coarse aggregate replacement percentage     sea sand chlorideion content     long-term mechanical properties     stress–strain curve    

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Preparation and characterization of

Chunhua XU, Dandan CHENG, Baoyu GAO, Zhilei YIN, Qinyan YUE, Xian ZHAO

Frontiers of Environmental Science & Engineering 2012, Volume 6, Issue 4,   Pages 455-462 doi: 10.1007/s11783-010-0275-1

Abstract: experiments were conducted to explore the adsorption of Cr(VI) in aqueous solutions by -FeOOH-coated sandthe positive value of showed that the adsorption of Cr(VI) in aqueous solutions by -FeOOH-coated sand

Keywords： β-FeOOH-coated sand     Cr(VI)     adsorption     isotherm     kinetics    

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Layer-like FAU-type zeolites: A comparative view on different preparation routes

Bastian Reiprich, Tobias Weissenberger, Wilhelm Schwieger, Alexandra Inayat

Frontiers of Chemical Science and Engineering 2020, Volume 14, Issue 2,   Pages 127-142 doi: 10.1007/s11705-019-1883-3

Abstract: The creation of intergrown layer-like zeolite crystals is one route to form hierarchical zeolites.After a short general survey into routes for the preparation of hierarchical pore systems in FAU, wewill review the currently existing strategies for the synthesis of FAU with layer-like morphology.However, a very recent approach is the synthesis of layer-like FAU-type zeolite crystals assembled inThis additive-free preparation route for layer-like FAU, which appears very attractive from an ecological

Keywords： FAU     hierarchical zeolite     layer-like morphology    

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Pondering over the scientific thinking of earthquake prediction from the miss report of Wenchuan Earthquake—re-discussingLi Siguang’s earthquake prediction thought

Zhao Wenjin

Strategic Study of CAE 2009, Volume 11, Issue 6,   Pages 4-15

Abstract:

According to the experience and problems of seismic monitoring and earthquakeprediction for many years in China, it was discussed the earthquake mechanism, preliminary methods forprediction research and the mechanism and miss report of Wenchuan Earthquake, analyzed prediction precursorof short-term and impending earthquake, seismometry application limitation and ground stress transferand track, and put forward 9 suggestions for future earthquake prediction.

Keywords： Wenchuan Earthquake     earthquake prediction     ground stress     Li Siguang    

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Impact analytical models for earthquake-induced pounding simulation

Kun YE, Li LI

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 142-147 doi: 10.1007/s11709-009-0029-y

Abstract: Structural pounding under earthquake has been recently extensively investigated using various impactimpact spring stiffness, coefficient of restitution, and relative approaching velocity in the Hertz modelAt the same time, a modified Kelvin impact model, which can reasonably account for the physical natureof pounding and conveniently implemented in the earthquake-induced pounding simulation of structural

Keywords： structural pounding     Hertz model     Kelvin model     nonlinear damping     coefficient of restitution    

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Sub-layer Movement in the Large-scale Stratum

Xu Shaoxie

Strategic Study of CAE 2006, Volume 8, Issue 6,   Pages 14-22

Abstract:

It was reported that a new find on sub-layer movement in the large-scale stratum had been observedEarthquakes with different division magnitude can represent movement of sub-layer with different thicknessEvents with strong tremble of sub-layer movement have been analyzed, which were recorded by stationscertain relationship between events with strong tremble recoded by Golmud Station in November, 2001 and earthquakeThat information is very important for earthquake prediction research and geodynamic recognition.

Keywords： sub-layer movement in the large-scale stratum     events with strong tremble     earthquake prediction    

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A metadata model for collaborative experiments and simulations in earthquake engineering

Jean-Pierre BARDET, Nazila MOKARRAM, Fang LIU

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 2,   Pages 133-153 doi: 10.1007/s11709-010-0036-z

Abstract: Research projects in earthquake engineering yield a very large amount of complex data from experimentsThe present metadata model was designed to document and exchange a large number of large data files inearthquake engineering, but is applicable to other fields of engineering and science.The model was conceived based on a series of former data models, which were unduly complicated and limitedSimpler than its predecessors, the present metadata model applies to all kinds of earthquake engineering

Keywords： metadata     data     documentation     experiment     simulation    

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Improved analytical model for residual stress prediction in orthogonal cutting

Zhaoxu QI,Bin LI,Liangshan XIONG

Frontiers of Mechanical Engineering 2014, Volume 9, Issue 3,   Pages 249-256 doi: 10.1007/s11465-014-0310-1

Abstract:

The analytical model of residual stress in orthogonal cutting proposed by Jiann is an important toolIn application of the model, a problem of low precision of the surface residual stress prediction isboundary conditions, unreasonable calculation method of thermal stress, ignorance of stress constraintwith the real cutting process; an improved calculation method of thermal stress is adopted; a stressAlso, Jiann’s model and the improved model are simulated under the same conditions with cutting

Keywords： residual stress     analytical model     orthogonal cutting     cutting force     cutting temperature    

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Resource allocation for physical-layer security in OFDMAdownlinkwith imperfect CSI None

Wei YANG, Jing MAO, Chen CHEN, Xiang CHENG, Liu-qing YANG, Hai-ge XIANG

Frontiers of Information Technology & Electronic Engineering 2018, Volume 19, Issue 3,   Pages 398-408 doi: 10.1631/FITEE.1700026

Abstract: We investigate the problem of resource allocation in a downlink orthogonal frequency-division multiple access (OFDMA) broadband network with an eavesdropper under the condition that both legitimate users and the eavesdropper are with imperfect channel state information (CSI). We consider three kinds of imperfect CSI: (1) noise and channel estimation errors, (2) feedback delay and channel prediction, and (3) limited feedback channel capacity, where quantized CSI is studied using rate-distortion theory because it can be used to establish an informationtheoretic lower bound on the capacity of the feedback channel. The problem is formulated as joint power and subcarrier allocation to optimize the maximum-minimum (max-min) fairness criterion over the users’ secrecy rate. The problem considered is a mixed integer nonlinear programming problem. To reduce the complexity, we propose a two-step suboptimal algorithm that separately performs power and subcarrier allocation. For a given subcarrier assignment, optimal power allocation is achieved by developing an algorithm of polynomial computational complexity. Numerical results show that our proposed algorithm can approximate the optimal solution.

Keywords： allocation     Orthogonal frequency-division multiple access (OFDMA)     Imperfect channel state information (CSI)     Physicallayer security    

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Numerical simulation of compaction parameters for sand-filled embankment using large thickness sand filling

Wentao WANG, Chongzhi TU, Rong LUO

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4,   Pages 568-576 doi: 10.1007/s11709-017-0444-4

Abstract: The study uses the finite element method to simulate a new technique of highway sand embankment fillingin Jianghan Plain district, which can raise the thickness of sand-filled layer from 30 cm to 70 cm andcan significantly shorten the construction period based on the guarantee of sand embankment constructionThe simulation results indicate that the sand-filled layer thickness of 70 cm is suitable for the newsand filling technique, and the sand-filled embankment project with tight construction period is suggested

Keywords： sand embankment     compaction in large thickness     numerical simulation     small size vibratory roller     steady    

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Multi-class dynamic network traffic flow propagation model with physical queues

Yanfeng LI, Jun LI

Frontiers of Engineering Management 2017, Volume 4, Issue 4,   Pages 399-407 doi: 10.15302/J-FEM-2017041

Abstract: This paper proposes an improved multi-class dynamic network traffic flow propagation model with a considerationof physical queues.To characterize this phenomenon by numerical methods, the improved model is directly formulated in discreteNumerical examples are developed to illustrate the unrealistic flows of the existing model and the performanceof the improved model.

Keywords： first-in-first-out (FIFO)     multi-class traffic     physical queues     traffic flow modeling    

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Title Author Date Type Operation

Short-term and impending precursor of sand layer stress in Wenchuan Earthquake

Wang Baoyu,Tong Xiaohui,Sun Xiaoming ,Sun Wei

Journal Article

Unified description of sand behavior

Feng ZHANG, Bin YE, Guanlin YE

Journal Article

Destructive Earthquakes Are Predictable——The Physical Model of Earthquake Gestation and the Signal of

Sun Wei

Journal Article

The phenomena based on the before Wenchuan Earthquake, the characteristic of large scale and deep layeron dynamic force of earthquake occurrence has been recognized

Xu Shaoxie

Journal Article

Effects of coarse and fine aggregates on long-term mechanical properties of sea sand recycled aggregate

Journal Article

Preparation and characterization of

Chunhua XU, Dandan CHENG, Baoyu GAO, Zhilei YIN, Qinyan YUE, Xian ZHAO

Journal Article

Layer-like FAU-type zeolites: A comparative view on different preparation routes

Bastian Reiprich, Tobias Weissenberger, Wilhelm Schwieger, Alexandra Inayat

Journal Article

Pondering over the scientific thinking of earthquake prediction from the miss report of Wenchuan Earthquake—re-discussingLi Siguang’s earthquake prediction thought

Zhao Wenjin

Journal Article

Impact analytical models for earthquake-induced pounding simulation

Kun YE, Li LI

Journal Article

Sub-layer Movement in the Large-scale Stratum

Xu Shaoxie

Journal Article

A metadata model for collaborative experiments and simulations in earthquake engineering

Jean-Pierre BARDET, Nazila MOKARRAM, Fang LIU

Journal Article

Improved analytical model for residual stress prediction in orthogonal cutting

Zhaoxu QI,Bin LI,Liangshan XIONG

Journal Article

Resource allocation for physical-layer security in OFDMAdownlinkwith imperfect CSI

Wei YANG, Jing MAO, Chen CHEN, Xiang CHENG, Liu-qing YANG, Hai-ge XIANG

Journal Article

Numerical simulation of compaction parameters for sand-filled embankment using large thickness sand filling

Wentao WANG, Chongzhi TU, Rong LUO

Journal Article

Multi-class dynamic network traffic flow propagation model with physical queues

Yanfeng LI, Jun LI

Journal Article