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A three-dimensional two-level gradient smoothing meshfree method for rainfall induced landslide simulations

Dongdong WANG, Jiarui WANG, Junchao WU, Junjun DENG, Ming SUN

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 337-352 doi: 10.1007/s11709-018-0467-5

Abstract: A three-dimensional two-level gradient smoothing meshfree method is presented for rainfall induced landslidecomputation in the present formulation, the two-level smoothed gradient of meshfree shape function iscapable of achieving a given influence domain more efficiently than the standard gradient of meshfreeprovides an efficient three-dimensional regularized meshfree formulation for large deformation rainfall inducedThe exponential damage and pressure dependent plasticity relationships are utilized to describe the failure

Keywords： meshfree method     landslide     rainfall     three-dimensional two-level gradient smoothing     nodal integration    

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Effect of Joule heating on electro-osmotic flow in a closed-end micro-channel with isothermal and convective boundary conditions

Liang ZHAO, Linhua LIU,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 381-388 doi: 10.1007/s11708-009-0057-2

Abstract: The effect of Joule heating on the induced pressure gradient is also studied, which is very importantThe results reveal that the induced pressure gradient, taking into consideration Joule heating, is significantlyThe induced pressure gradient difference between considering Joule heating and without considering Joule

Keywords： closed-end micro-channel     electrical double layer     electro-osmotic flow     induced pressure gradient     Joule    

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Changes in structure and functional properties of whey proteins induced by high hydrostatic pressure:

Xiaoming LIU, Jia NING, Stephanie CLARK,

Frontiers of Chemical Science and Engineering 2009, Volume 3, Issue 4,   Pages 436-442 doi: 10.1007/s11705-009-0251-0

Abstract: High hydrostatic pressure (HHP) is an alternative technology to heat processing for food product modificationsIn this paper, the mechanism underlying pressure-induced changes in -lactoglobulin and -lactabumin is

Keywords： -lactoglobulin     processing     functional     alternative technology     environmental    

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Salinity Gradient Energy: Current State and New Trends

Olivier Schaetzle, Cees J. N. Buisman

Engineering 2015, Volume 1, Issue 2,   Pages 164-166 doi: 10.15302/J-ENG-2015046

Abstract:

In this article we give an overview of the state of the art of salinity gradient technologies.We first introduce the concept of salinity gradient energy, before describing the current state of developmentWe conclude with the new trends in the young field of salinity gradient technologies.

Keywords： salinity gradient energy     pressure-retarded osmosis     reverses electrodialysis    

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Modeling of coal swelling induced by water vapor adsorption

Zhejun PAN

Frontiers of Chemical Science and Engineering 2012, Volume 6, Issue 1,   Pages 94-103 doi: 10.1007/s11705-011-1172-2

Abstract: Gas adsorption-induced coal swelling is a well-know phenomenon.The model extended an energy balance approach for gas adsorption-induced coal swelling to water vaporadsorption-induced coal swelling, assuming that only the first layer of adsorbed molecules of the multilayer

Keywords： multilayer adsorption     vapour pressure     coal shrinkage     relative humidity     permeability    

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Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 4,   Pages 522-532 doi: 10.1007/s11709-023-0930-9

Abstract: Pressure maintenance openings are typically used under complicated hydrogeological conditions.Owing to the high risk of face failure, the necessity of support pressure when cutterhead support isimplemented and a method for determining the value of compressed air pressure using different supportThe required compressed air pressure increases significantly as the support ratio decreases.To satisfy the requirement of chamber openings at atmospheric pressure, the stratum reinforcement strength

Keywords： tunnel face stability     cutterhead configuration     aperture ratio     pressure gradient     support ratio    

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Development of an axial-type fan with an optimization method

Chong-hyun CHO, Soo-yong CHO, Chaesil KIM,

Frontiers in Energy 2009, Volume 3, Issue 4,   Pages 414-422 doi: 10.1007/s11708-009-0038-5

Abstract: An axial-type fan that operates at a relative total pressure of 671Pa and a static pressure of;Pa with a flowrate of 416.6m/min is developed using an optimization technique based on the gradientThe total and static pressure are applied to the restriction condition with the operating flowrate on

Keywords： axial-type fan     gradient method     free-vortex method     design variable     total pressure     static pressure     operating    

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The Ejection and Sweep in the Wall Region of a Turbulent Boundary Layer Under Adverse Pressure Gradient

Zhang Qiang,Lu Lipeng

Strategic Study of CAE 2003, Volume 5, Issue 11,   Pages 47-50

Abstract: The evolution of coherent structures in the wall region of a turbulent boundary layer under adverse pressurethe shear stress, the contribution of sweep motions is stronger than that of ejections under adverse pressuregradient.transport of shear-stress and kinetic energy of turbulence more strongly than the ejections under adverse pressuregradient.

Keywords： coherent structures     turbulent boundary layer     adverse pressure gradients     direct numerical simulation    

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Experimental study on slurry-induced fracturing during shield tunneling

Teng WANG, Dajun YUAN, Dalong JIN, Xinggao LI

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 333-345 doi: 10.1007/s11709-021-0718-8

Abstract: Facial support in slurry shield tunneling is provided by slurry pressure to balance the external earthand water pressure.In this study, a hydraulic fracturing apparatus was developed to test the slurry-induced fracturing ofThe fracturing pressure increases linearly with the increase in the circumferential pressure, but itis almost independent of the axial pressure.

Keywords： slurry shield tunneling     hydraulic fracturing test     fracturing pressure     fracture dip     unconfined compressive    

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Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method

Youjun NING, Xinmei AN, Jun YANG, Guowei MA,

Frontiers of Structural and Civil Engineering 2010, Volume 4, Issue 2,   Pages 223-232 doi: 10.1007/s11709-010-0022-5

Abstract: The blasting process in jointed rock mass is simulated by application of the explosion gas pressure onthe expanding borehole walls and induced connected fracture surfaces around the boreholes.

Keywords： blast crater     jointed rock mass     explosion gas pressure     discontinuous deformation analysis (DDA) method    

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prediction and optimization design of sustainable concrete based on squirrel search algorithm-extreme gradient

Frontiers of Structural and Civil Engineering   Pages 1310-1325 doi: 10.1007/s11709-023-0997-3

Abstract: traditional compressive strength test, this study combines five novel metaheuristic algorithms with extreme gradientThe results indicated that the squirrel search algorithm-extreme gradient boosting (SSA-XGB) yielded

Keywords： sustainable concrete     fly ash     slay     extreme gradient boosting technique     squirrel search algorithm    

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Vibration analysis of nano-structure multilayered graphene sheets using modified strain gradient theory

Amir ALLAHBAKHSHI,Masih ALLAHBAKHSHI

Frontiers of Mechanical Engineering 2015, Volume 10, Issue 2,   Pages 187-197 doi: 10.1007/s11465-015-0339-9

Abstract:

In this paper, for the first time, the modified strain gradient theory is used as a new size-dependentAfter obtaining the governing equations based on modified strain gradient theory via principle of minimumpotential energy, as only infinitesimal vibration is considered, the net pressure due to the vdW interaction

Keywords： graphene     van der Waals (vdW) force     modi- fied strain gradient elasticity theory     size effect parameter    

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Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators

Hamid M. SEDIGHI, Hassen M. OUAKAD

Frontiers of Structural and Civil Engineering 2020, Volume 14, Issue 6,   Pages 1520-1530 doi: 10.1007/s11709-020-0672-x

Abstract: undertake two models to capture the nanostructure nonlocal size effects: the strain and the velocity gradientThe structural nonlinear behavior of the system assuming both strain and velocity gradient theories is

Keywords： velocity gradient elasticity theory     nanotube resonators     differential-quadrature method     nonlinear vibration    

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Flow-Induced Instabilities in Pump-Turbines in China

Zhigang Zuo,Shuhong Liu

Engineering 2017, Volume 3, Issue 4,   Pages 504-511 doi: 10.1016/J.ENG.2017.04.010

Abstract:

The stability of pump-turbines is of great importance to the operation of pumped storage power (PSP) stations. Both hydraulic instabilities and operational instabilities have been reported in PSP stations in China. In order to provide a reference to the engineers and scientists working on pump-turbines, this paper summarizes the hydraulic instabilities and performance characteristics that promote the operational instabilities encountered in pump-turbine operations in China. Definitions, analytical methods, numerical and experimental studies, and main results are clarified. Precautions and countermeasures are also provided based on a literature review. The gaps between present studies and the need for engineering practice are pointed out.

Keywords： Pump-turbines     Flow-induced instability     Pressure fluctuations     S-shaped characteristics     Positive slopes    

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Predicting shear strength of slender beams without reinforcement using hybrid gradient boosting trees

Thuy-Anh NGUYEN; Hai-Bang LY; Van Quan TRAN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 10,   Pages 1267-1286 doi: 10.1007/s11709-022-0842-0

Abstract: Gradient Boosting (GB) technique was developed and evaluated in combination with three different optimization

Keywords： slender beam     shear strength     gradient boosting     optimization algorithms    

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Title Author Date Type Operation

A three-dimensional two-level gradient smoothing meshfree method for rainfall induced landslide simulations

Dongdong WANG, Jiarui WANG, Junchao WU, Junjun DENG, Ming SUN

Journal Article

Effect of Joule heating on electro-osmotic flow in a closed-end micro-channel with isothermal and convective boundary conditions

Liang ZHAO, Linhua LIU,

Journal Article

Changes in structure and functional properties of whey proteins induced by high hydrostatic pressure:

Xiaoming LIU, Jia NING, Stephanie CLARK,

Journal Article

Salinity Gradient Energy: Current State and New Trends

Olivier Schaetzle, Cees J. N. Buisman

Journal Article

Modeling of coal swelling induced by water vapor adsorption

Zhejun PAN

Journal Article

Effect of cutterhead configuration on tunnel face stability during shield machine maintenance outages

Journal Article

Development of an axial-type fan with an optimization method

Chong-hyun CHO, Soo-yong CHO, Chaesil KIM,

Journal Article

The Ejection and Sweep in the Wall Region of a Turbulent Boundary Layer Under Adverse Pressure Gradient

Zhang Qiang,Lu Lipeng

Journal Article

Experimental study on slurry-induced fracturing during shield tunneling

Teng WANG, Dajun YUAN, Dalong JIN, Xinggao LI

Journal Article

Simulation of blast induced crater in jointed rock mass by discontinuous deformation analysis method

Youjun NING, Xinmei AN, Jun YANG, Guowei MA,

Journal Article

prediction and optimization design of sustainable concrete based on squirrel search algorithm-extreme gradient

Journal Article

Vibration analysis of nano-structure multilayered graphene sheets using modified strain gradient theory

Amir ALLAHBAKHSHI,Masih ALLAHBAKHSHI

Journal Article

Velocity gradient elasticity for nonlinear vibration of carbon nanotube resonators

Hamid M. SEDIGHI, Hassen M. OUAKAD

Journal Article

Flow-Induced Instabilities in Pump-Turbines in China

Zhigang Zuo,Shuhong Liu

Journal Article

Predicting shear strength of slender beams without reinforcement using hybrid gradient boosting trees

Thuy-Anh NGUYEN; Hai-Bang LY; Van Quan TRAN

Journal Article