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Correlation between tension softening relation and crack extension resistance in concrete

Xiufang ZHANG , Shilang XU ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 323-329 doi: 10.1007/s11709-009-0041-2

Abstract: The crack extension resistance is then a function of the softening curve, which is a basic mechanicalThe relationship between the softening curve and the crack extension resistance curve is then analyzedthe crack extension resistance curve is closely related to the characteristic point on used tension softening

Keywords： concrete     fracture process zone     crack extension GR resistance     tension softening curve    

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The smoothed finite element method (S-FEM): A framework for the design of numerical models for desired solutions

Gui-Rong Liu

Frontiers of Structural and Civil Engineering 2019, Volume 13, Issue 2,   Pages 456-477 doi: 10.1007/s11709-019-0519-5

Abstract: properties and unique features of S-FEM models are discussed in detail, including 1) theoretically proven softening

Keywords： finite element method     strain smoothing technique     smoothing domain     weakened weak form     solid mechanics     softeningeffect     upper bound solution    

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Soil-water interaction in unsaturated expansive soil slopes

ZHAN Liangtong

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 2,   Pages 198-204 doi: 10.1007/s11709-007-0023-1

Abstract: field inspection of rainwater infiltration and comprehensive experiments, including wetting-induced softeningInfiltration of rainwater not only results in wetting-induced softening of the shallow unsaturated soil

Keywords： strength     intensive soil-water     comprehensive     Infiltration     wetting-induced softening    

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Forward osmosis coupled with lime-soda ash softening for volume minimization of reverse osmosis

Jiandong Lu, Shijie You, Xiuheng Wang

Frontiers of Environmental Science & Engineering 2021, Volume 15, Issue 1, doi: 10.1007/s11783-020-1301-6

Abstract: Abstract • Forward osmosis (FO) coupled with chemical softening for CCI ROC minimization • Effectiveremoval of scale precursor ions by lime-soda ash softening • Enhanced water recovery from 54% to 86%by mitigation of FO membrane scaling • High-purity CaCO3 was recovered from the softening sludge • MembraneTo address this issue, in this study, we focused on coupling forward osmosis (FO) with chemical softeningIn addition, CaCO3 (92.2% purity) was recovered from the softening sludge with an average yield of 5.6

Keywords： Coal chemical industry     Forward osmosis     Chemical softening     Reverse osmosis concentrate    

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Strengthening and Softening of Ferrite+Pearlite Steels Produced by Thin Slab Casting and Rolling

Fu Jie,Wu Huajie,Liu Yangchun

Strategic Study of CAE 2008, Volume 10, Issue 4,   Pages 65-72

Abstract: justify;">Based on the principle of the integrated strengthening of steel, the strengthening and the softening

Keywords： HSLC steel     strengthening     softening     basal plate for cold rolling     super steel    

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Analysis of stiffness and flexural strength of a reinforced concrete beam using an invented reinforcement system

Nazim Abdul NARIMAN, Martin HUSEK, Ilham Ibrahim MOHAMMAD, Kaywan Othman AHMED, Diyako DILSHAD, Ibrahim KHIDR

Frontiers of Structural and Civil Engineering 2021, Volume 15, Issue 2,   Pages 378-389 doi: 10.1007/s11709-021-0706-z

Abstract: In this study, we conducted experimental tests on two specimens of reinforced concrete beams using a three-point bending test to optimize the flexure and stiffness designs. The first specimen is a reinforced concrete beam with an ordinary reinforcement, and the second specimen has an invented reinforcement system that consists of an ordinary reinforcement in addition to three additional bracings using steel bars and steel plates. The results of the flexure test were collected and analyzed, and the flexural strength, the rate of damage during bending, and the stiffness were determined. Finite element modeling was applied for both specimens using the LS-DYNA program, and the simulation results of the flexure test for the same outputs were determined. The results of the experimental tests showed that the flexural strength of the invented reinforcement system was significantly enhanced by 15.5% compared to the ordinary system. Moreover, the flexural cracks decreased to a significant extent, manifesting extremely small and narrow cracks in the flexure spread along the bottom face of the concrete. In addition, the maximum deflection for the invented reinforced concrete beam decreased to 1/3 compared to that of an ordinary reinforced concrete beam. The results were verified through numerical simulations, which demonstrated excellent similarities between the flexural failure and the stiffness of the beam. The invented reinforcement system exhibited a high capability in boosting the flexure design and stiffness.

Keywords： three-point flexure test     softening stage     flexural crack     flexural strain    

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Analysis of effect of different construction methods of piles on the end effect on skin friction of piles

ZHOU Hongbo, CHEN Zhuchang

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 4,   Pages 458-463 doi: 10.1007/s11709-007-0062-7

Abstract: Based on the comparative analysis of end effect on skin friction of displacement-pile (driven pile),the end effect on skin friction of bored pile is studied.The end effect on skin friction between driven pile and bored pile is different and the end effect onThe concept of additional mud cake formed by the effect of cushion at the bottom of borehole during pouringconcrete is introduced to explain the mechanism of end effect on skin friction of the bored pile.

Keywords： distance     different     concept     additional     bottom    

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A review on different theoretical models of electrocaloric effect for refrigeration

Frontiers in Energy 2023, Volume 17, Issue 4,   Pages 478-503 doi: 10.1007/s11708-023-0884-6

Abstract: The performance parameters for characterizing the electrocaloric effect are isothermal entropy changeThis paper reviews the electrocaloric effect of ferroelectric materials based on different theoreticalsimulation, and finite element analysis) to explain the basic theory of calculating the electrocaloric effectThen, it comprehensively reviews the recent progress of these methods in regulating the electrocaloric effectand the generation mechanism of the electrocaloric effect.

Keywords： electrocaloric effect     effective Hamiltonian     phase-field modeling     different theoretical models    

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A new miniaturized engine based on thermomagnetic effect of magnetic fluids

Lujun ZHOU, Yimin XUAN, Qiang LI, Wenlei LIAN

Frontiers in Energy 2009, Volume 3, Issue 2,   Pages 160-166 doi: 10.1007/s11708-009-0018-9

Abstract: NdFeB magnet, a kerosene-based magnetic fluid and a rotor, is proposed based on the thermomagnetic effect

Keywords： magnetic fluid     thermomagnetic effect     engine    

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The cooperation effect of Ni and Pt in the hydrogenation of acetic acid

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 3,   Pages 397-407 doi: 10.1007/s11705-021-2076-4

Abstract: The catalytic hydrogenation of carboxylic acid to alcohols is one of the important strategies for the conversion of biomass. Herein, a series of Ni-doped PtSn catalysts were prepared, characterized and studied in the hydrogenation of acetic acid. The Ni dopant has a strong interaction with Pt, which promotes the hydrogen adsorption, providing an activated hydrogen-rich environment for the hydrogenation. Meanwhile, the presence of Ni also improves the Pt dispersion, giving more accessible active sites for hydrogen activation. The cooperation of Pt and Ni significantly promotes the catalytic activity of the hydrogenation of acetic acid to ethanol. As a result, the catalyst with 0.1% Ni exhibits the best reaction activity, and its space time yield is twice as that of the PtSn/SiO2 catalyst. It provides a meaningful instruction on the catalyst design for the carboxylic acid hydrogenation.

Keywords： acetic acid     ethanol     hydrogenation     Pt     Ni     cooperation effect    

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Direct energy rebound effect for road transportation in China

Frontiers of Engineering Management   Pages 597-611 doi: 10.1007/s42524-023-0276-y

Abstract: these objectives may, in part or in entirety, be offset by the phenomenon known as the energy rebound effectassociated with road passenger transportation and road freight transportation represent a partial rebound effect, falling short of reaching the magnitude of a counterproductive backfire effect.

Keywords： road transportation     direct energy rebound effect     asymmetric price effects     panel data model    

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Photoaging mechanism of microplastics: a perspective on the effect of dissolved organic matter in natural

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 11, doi: 10.1007/s11783-023-1743-8

Abstract:

● Microplastics (MPs) undergo photoaging in natural water under light irradiation.

Keywords： Microplastics     Photoaging     Dissolved organic matter     ROS generation    

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Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system

Zhaorui ZHAO, Bao YANG, Ziwen XING

Frontiers in Energy 2019, Volume 13, Issue 1,   Pages 193-203 doi: 10.1007/s11708-019-0608-0

Abstract: analysis has also been conducted to assess the performance and operating conditions of the multiple effect

Keywords： solar energy     steam generating     multi-effect desalination    

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Research on the flotation of kaolinite using a series of dodecyl tertiary amines

Cao Xuefeng,Liu Changmiao, Hu Yuehua

Strategic Study of CAE 2011, Volume 13, Issue 1,   Pages 93-97

Abstract:

The flotation performances of four tertiary amines (DRN, DEN, DPN and DBN) on kaolinite were studied in this paper. All the four tertiary amines show very good flotation effects on kaolinite, and DEN does the best, with the highest flotation recovery of 92 %. In the acid pH scale, four tertiary can float kaolinite well because their cationics absorb onto the surface of kaolinite by electrostatic force; with the increasing of pH, the content of cationics was decreased to result in the lower flotation recovery. On the basis of Zeta potential, the surface of kaolinite is mainly electro-negative in the whole pH region, and its Zeta potential is remarkable increased after kaolinite was affected by four tertiary amines. Both the results of FT-IR spectra and Zeta potential show that four tertiary amines are absorbed onto the surface of kaolinite by electrostatic force. The flotation differences of four tertiary amines are due to the electronic effects and space steric effects of the substituents belonging to N atom in the amine molecule.

Keywords： tertiary amine     kaolinite     flotation     electrostatic effect     electronic effect     space steric effect    

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Title Author Date Type Operation

Correlation between tension softening relation and crack extension resistance in concrete

Xiufang ZHANG , Shilang XU ,

Journal Article

The smoothed finite element method (S-FEM): A framework for the design of numerical models for desired solutions

Gui-Rong Liu

Journal Article

Soil-water interaction in unsaturated expansive soil slopes

ZHAN Liangtong

Journal Article

Forward osmosis coupled with lime-soda ash softening for volume minimization of reverse osmosis

Jiandong Lu, Shijie You, Xiuheng Wang

Journal Article

Strengthening and Softening of Ferrite+Pearlite Steels Produced by Thin Slab Casting and Rolling

Fu Jie,Wu Huajie,Liu Yangchun

Journal Article

Analysis of stiffness and flexural strength of a reinforced concrete beam using an invented reinforcement system

Nazim Abdul NARIMAN, Martin HUSEK, Ilham Ibrahim MOHAMMAD, Kaywan Othman AHMED, Diyako DILSHAD, Ibrahim KHIDR

Journal Article

Li Haoran: Research on the Transformation Decision of "Replacing Coal With Gas" Based on Peer Effectand Network Effect (2020-7-11)

19 May 2022

Conference Videos

Analysis of effect of different construction methods of piles on the end effect on skin friction of piles

ZHOU Hongbo, CHEN Zhuchang

Journal Article

A review on different theoretical models of electrocaloric effect for refrigeration

Journal Article

A new miniaturized engine based on thermomagnetic effect of magnetic fluids

Lujun ZHOU, Yimin XUAN, Qiang LI, Wenlei LIAN

Journal Article

The cooperation effect of Ni and Pt in the hydrogenation of acetic acid

Journal Article

Direct energy rebound effect for road transportation in China

Journal Article

Photoaging mechanism of microplastics: a perspective on the effect of dissolved organic matter in natural

Journal Article

Modeling analysis on solar steam generator employed in multi-effect distillation (MED) system

Zhaorui ZHAO, Bao YANG, Ziwen XING

Journal Article

Research on the flotation of kaolinite using a series of dodecyl tertiary amines

Cao Xuefeng,Liu Changmiao, Hu Yuehua

Journal Article