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Microdamage study of granite under thermomechanical coupling based on the particle flow code

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 9,   Pages 1413-1427 doi: 10.1007/s11709-023-0953-2

Abstract: The thermomechanical coupling of rocks refers to the interaction between the mechanical and thermodynamicThe study of this coupling interaction is essential for understanding the mechanical and thermodynamicIn this study, an improved temperature-dependent linear parallel bond model is introduced under the frameworkA series of numerical thermomechanical coupling tests are then conducted to calibrate the micro-parameters

Keywords： thermomechanical coupling effect     granite     improved linear parallel bond model     thermal property     particle    

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Single-atom catalysis: a promising avenue for precisely controlling reaction pathways

Frontiers of Chemical Science and Engineering doi: 10.1007/s11705-024-2434-0

Abstract: Single-atom catalysts (SACs), characterized by exceptionally high atom efficiency, have garnered significant attention across various catalytic reactions. Recent studies have showcased SACs with robust capabilities for precise catalysis, specifically targeting reactions along designated pathways. This review focuses on the advances in the precise activation and reconstruction of chemical bonds on SACs, including precise activation of C–O and C–H bonds and selective couplings involving C–C and C–N bonds. Our discussion begins with a thorough exploration of the factors that render SACs skilled in precise catalytic processes, encompassing the narrow d-band electronic state of single atom site resulting in the adsorption tendency, isolate site resulting in unique adsorption structure, and synergy effect of a single atom site with its neighbors. Subsequently, we elaborate on the applications of SACs in electrocatalysis and thermocatalysis including four prominent reactions, namely, electrochemical CO2 reduction, urea electrochemical synthesis, CO2 hydrogenation, and CH4 activation. Then the concept of rational design of SACs for precisely controlling reaction pathways is discussed from the aspects of pore structure design, support-metal strong interaction, and support hydrophilic/hydrophobic. Finally, we summarize the challenges encountered by SACs in the field of precise catalytic processes and outline prospects for their further development in this domain.

Keywords： single atom catalysts     selective oxidation     CO2RR     bond coupling    

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Effect of embedment length of untreated natural fibres on the bond behaviour in cement mortar

Gudimella RAMAKRISHNA, Sriraman PRIYADHARSHINI

Frontiers of Structural and Civil Engineering 2018, Volume 12, Issue 4,   Pages 454-460 doi: 10.1007/s11709-017-0454-2

Abstract: effects of various matrices with 1:3, 1:4 and 1:5 mortars and fibre types of sisal and coir on the bondFrom the results, it is seen that the bond strength is improving with respect to age of curing in casesuch as mortar mixes, sand gradation, w/c ratio and embedded length also showed significant effect on bond

Keywords： bond strength     cement mortar     natural fibre     pullout test     type of failure    

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Bond behavior of the interface between concrete and basalt fiber reinforced polymer bar after freeze–thaw

Frontiers of Structural and Civil Engineering 2024, Volume 18, Issue 4,   Pages 630-641 doi: 10.1007/s11709-024-0989-y

Abstract: The shear bond of interface between concrete and basalt fiber reinforced polymer (BFRP) bars during freeze–thawIn this study, 48 groups of pull-out specimens were designed to test the shear bond of the BFRP-concretethat a larger diameter or longer embedment length of BFRP rebar resulted in lower interfacial shear bondHowever, higher concrete strength and fewer F–T cycles were beneficial for enhancing the interfacial bondThe model demonstrated accuracy in describing the shear bond behavior of the interface under numerous

Keywords： F–T cycle     interface     shear bond strength     bond stress−slip curves     bond degradation    

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Calculation of Bond-length, Bond-energy and Force Constant of Hydrogen Molecule by Classical Mechanics

Chen Jing

Strategic Study of CAE 2003, Volume 5, Issue 6,   Pages 39-43

Abstract: molecule structural parameters are calculated with the classical mechanics, and the hydrogen molecule bond-length

Keywords： hydrogen molecule     bond-length     bond-energy     force constant    

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Study of bond strength between various grade of Ordinary Portland Cement (OPC) and Portland Pozzolane

A D POFALE, S P WANJARI

Frontiers of Structural and Civil Engineering 2013, Volume 7, Issue 1,   Pages 39-45 doi: 10.1007/s11709-013-0193-y

Abstract: But, till to date, a few literature is available on bond strength of concrete using PPC mixes.Hence, a comparative study was conducted on bond strength between OPC and PPC mixes.observed at 0.25 mm slip at loaded end called as critical bond stress and at maximum bond load calledas maximum bond stress.Whereas, marginal improvement was noticed in maximum bond strength of PPC mixes.

Keywords： bond strength     Portland Pozzolane Cement (PPC) concrete     Ordinary Portland Cement (OPC) concrete     bond between    

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Effect of noble metal nanoparticle size on C–N bond cleavage performance in hydrodenitrogenation: a study

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 1986-2000 doi: 10.1007/s11705-023-2337-5

Abstract: Breakage of the C–N bond is a structure sensitive process, and the catalyst size significantly affectsOn the active metal nanoparticle scale, the role of catalyst size in C–N bond cleavage has not been clearlyResults showed a 13 times higher reaction rate for sp3-hybridized C–N bond cleavage than sp2-hybridized C–N bond cleavage, while the reaction rate tended to increase first and thencleavage activity, and the step atoms are the active sites for the C–N bond cleavage.

Keywords： sp3/sp2-hybridized C–N bond     noble metal nanoparticle     catalytic active site     turnover    

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Clean production of lactic acid by selective carbon-carbon bond cleavage of biomass feedstock over a

Frontiers of Chemical Science and Engineering 2024, Volume 18, Issue 2, doi: 10.1007/s11705-023-2380-2

Abstract: For the selective C–C bond cleavage of biomass-based feedstocks photocatalyzed by C/BiOCl-180, the xyloseBiOCl-180 photocatalyst has opened new research horizons for the investigation and application of C–C bond

Keywords： carbon-carbon bond cleavage     biomass reforming     C/BiOCl     lactic acid     photocatalysis    

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The effect of carbon nanotubes and polypropylene fibers on bond of reinforcing bars in strain resilient

Souzana P. TASTANI,Maria S. KONSTA-GDOUTOS,Stavroula J. PANTAZOPOULOU,Victor BALOPOULOS

Frontiers of Structural and Civil Engineering 2016, Volume 10, Issue 2,   Pages 214-223 doi: 10.1007/s11709-016-0332-3

Abstract: bars and concrete is engaged through rib translation relative to concrete, and comprises longitudinal bondreleased upon radial cracking of the cover along the anchorage with commensurate abrupt loss of the bondAny improvement of the matrix tensile properties is expected to favorably affect bond in terms of strengthslip, residual resistance and controlled slippage.The aim of this paper is to investigate the local bondstrength up to large levels of controlled bar-slip; the elasto-plastic bond response envelope was a

Keywords： carbon nanotubes     strain resilient cementitious composite     polypropylene fibers     tensile bending     bond    

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Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 1,   Pages 131-143 doi: 10.1007/s11709-021-0787-8

Abstract: This paper studied the effect of incorporation of carbon nanotubes (CNTs) in carbon fiber reinforced polymer (CFRP) on strengthening of reinforced concrete (RC) beams. The RC beams were prepared, strengthened in flexure by externally bonded CFRP or CNTs-modified CFRP sheets, and tested under four-point loading. The experimental results showed the ability of the CNTs to delay the initiation of the cracks and to enhance the flexural capacity of the beams strengthened with CFRP. A nonlinear finite element (FE) model was built, validated, and used to study the effect of various parameters on the strengthening efficiency of CNTs-modified CFRP. The studied parameters included concrete strength, flexural reinforcement ratio, and CFRP sheet configuration. The numerical results showed that utilization of CNTs in CFRP production improved the flexural capacity of the strengthened beams for U-shape and underside-strip configurations. The enhancement was more pronounced in the case of U-shape than in the case of use of sheet strip covers on the underside of the beam. In case of using underside-strip, the longer or the wider the sheet, the higher was the flexural capacity of the beams. The flexural enhancement of RC beams by strengthening with CNTs-modified CFRP decreased with increasing the rebar diameter and was not affected by concrete strength.

Keywords： RC beams     flexural     strengthening     CFRP     CNTs     finite element    

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Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 6,   Pages 772-783 doi: 10.1007/s11705-022-2280-x

Abstract: Development of a titanium silicalite-1 (TS-1) catalyst with good crystallinity and a four-coordinate Ti framework is critical for efficient catalytic oxidation reaction under mild conditions. Herein, a size-controlled TS-1 zeolite (TS-1#0.1ACh (acetylcholine)) was synthesized via steam-assisted crystallization by introducing acetylcholine as a crystal growth modifier in the preparation process, and TS-1#0.1ACh was also employed in epoxidations of different substrates containing C=C double bonds. The crystalline sizes of the as-synthesized TS-1#0.1ACh catalysts were controlled with the acetylcholine content, and characterization results showed that the particle sizes of highly crystalline TS-1#0.1ACh zeolite reached 3.0 μm with a good Ti framework. Throughout the synthetic process, the growth rate of the crystals was accelerated by electrostatic interactions between the connected hydroxyl groups of the acetylcholine modifier and the negatively charged skeleton of the pre-zeolites. Furthermore, the TS-1#0.1ACh catalyst demonstrated maximum catalytic activity, good selectivity and high stability during epoxidation of allyl chloride. Importantly, the TS-1#0.1ACh catalyst was also highly versatile and effective with different unsaturated substrates. These findings may provide novel, easily separable and large TS-1 catalysts for efficient and clean industrial epoxidations of C=C double bonds.

Keywords： size-controlled TS-1     crystal modifier     steam-assisted crystallization     epoxidation    

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Prediction of the flash points of alkanes by group bond contribution method using artificial neural networks

PAN Yong, JIANG Juncheng, WANG Zhirong

Frontiers of Chemical Science and Engineering 2007, Volume 1, Issue 4,   Pages 390-394 doi: 10.1007/s11705-007-0071-z

Abstract: A group bond contribution model using artificial neural networks, which had the high ability of nonlinear

Keywords： information     nonlinear     quantitative correlation     superior     molecular    

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Recent progress in photocatalytic NAD(P)H regeneration for photocatalytic-enzymatic-coupling system

Frontiers of Chemical Science and Engineering 2024, Volume 18, Issue 4, doi: 10.1007/s11705-024-2398-0

Abstract: The potential development of photocatalytic NADH/NADPH regeneration and photocatalytic-enzymatic-coupling

Keywords： photocatalytic-enzymatic coupling     NAD(P)H regeneration     photocatalysis     efficiency    

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Simulation of steel beam under ceiling jet based on a wind–fire–structure coupling model

Frontiers of Structural and Civil Engineering 2023, Volume 17, Issue 1,   Pages 78-98 doi: 10.1007/s11709-022-0936-8

Abstract: Instead of applying the concept of adiabatic surface temperature (AST) to achieve fluid–structure coupling

Keywords： CFD–FEM coupling     steel beam     wind     ceiling jet     numerical heat transfer    

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A taxonomy of built asset information coupling

Frontiers of Engineering Management 2024, Volume 11, Issue 2,   Pages 247-268 doi: 10.1007/s42524-024-0311-7

Abstract: The digital transformation of the built asset industry is moving toward closer integration of physical and digital assets and resources. Within the framework of Cyber-Physical Systems (CPSs) and Digital Twins (DTs), an increasing number of studies focus on the technical aspects of CPS and DT. However, a unified framework describing the dimensions and characteristics essential for integrating lifecycle information remains elusive. To leverage these concepts effectively, it is necessary to develop new frameworks to classify and put into relationship various components that comprise the lifecycle information integration of physical and digital assets and resources. This paper addresses these gaps by proposing a taxonomy of Built Asset Lifecycle Information Couples, which outlines the dimensions and characteristics crucial for the lifecycle information integration of built assets and resources. The proposed taxonomy contributes to the efforts aimed at organizing the knowledge domain of lifecycle information management in the built environment.

Keywords： asset coupling     taxonomy     digitalization     lifecycle information management     built environment    

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Title Author Date Type Operation

Microdamage study of granite under thermomechanical coupling based on the particle flow code

Journal Article

Single-atom catalysis: a promising avenue for precisely controlling reaction pathways

Journal Article

Effect of embedment length of untreated natural fibres on the bond behaviour in cement mortar

Gudimella RAMAKRISHNA, Sriraman PRIYADHARSHINI

Journal Article

Bond behavior of the interface between concrete and basalt fiber reinforced polymer bar after freeze–thaw

Journal Article

Calculation of Bond-length, Bond-energy and Force Constant of Hydrogen Molecule by Classical Mechanics

Chen Jing

Journal Article

Study of bond strength between various grade of Ordinary Portland Cement (OPC) and Portland Pozzolane

A D POFALE, S P WANJARI

Journal Article

Effect of noble metal nanoparticle size on C–N bond cleavage performance in hydrodenitrogenation: a study

Journal Article

Clean production of lactic acid by selective carbon-carbon bond cleavage of biomass feedstock over a

Journal Article

The effect of carbon nanotubes and polypropylene fibers on bond of reinforcing bars in strain resilient

Souzana P. TASTANI,Maria S. KONSTA-GDOUTOS,Stavroula J. PANTAZOPOULOU,Victor BALOPOULOS

Journal Article

Effect of bond enhancement using carbon nanotubes on flexural behavior of RC beams strengthened with

Journal Article

Controllable synthesis of a large TS-1 catalyst for clean epoxidation of a C=C double bond under mild

Journal Article

Prediction of the flash points of alkanes by group bond contribution method using artificial neural networks

PAN Yong, JIANG Juncheng, WANG Zhirong

Journal Article

Recent progress in photocatalytic NAD(P)H regeneration for photocatalytic-enzymatic-coupling system

Journal Article

Simulation of steel beam under ceiling jet based on a wind–fire–structure coupling model

Journal Article

A taxonomy of built asset information coupling

Journal Article