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bond 2

bond strength 2

bond-energy 2

bond-length 2

finite element 2

force constant 2

pullout test 2

strengthening 2

CFRP 1

CH4 dissociation 1

CNTs 1

C–H bond activation 1

DFT 1

Interfacial bond 1

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Ordinary Portland Cement (OPC) concrete 1

PBO fiber sheet 1

Portland Pozzolane Cement (PPC) concrete 1

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RC beams 1

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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    

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    

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    

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    

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    

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    

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    

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    

Calculation of H2+ Structural Parameters based on Hydrogen Atomic Protonized Model

Chen Jing

Strategic Study of CAE 2004, Volume 6, Issue 11,   Pages 29-32

Abstract: Three formulas deduced from above model for bond-length, bond-energy and force constant of hydrogen molecule

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

Steel Fiber–Matrix Interfacial Bond in Ultra-High Performance Concrete: A Review Review

Yulin Deng,Zuhua Zhang,Caijun Shi,Zemei Wu,Chaohui Zhang

Engineering 2023, Volume 22, Issue 3,   Pages 215-232 doi: 10.1016/j.eng.2021.11.019

Abstract: The steel fiber–matrix interfacial bond is the main factor that governs other mechanical propertiesThis paper presents a comprehensive review on the research progress of fiber–matrix bond behaviorsThe parameters of the fiber–matrix bond, including the geometry and orientation of fibers, surface

Keywords: Ultra-high performance concrete     Interfacial bond     Steel fiber     Pullout behavior    

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

Frontiers of Structural and Civil Engineering   Pages 1413-1427 doi: 10.1007/s11709-023-0953-2

Abstract: In this study, an improved temperature-dependent linear parallel bond model is introduced under the framework

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

A density functional theory study of methane activation on MgO supported NiM cluster: role of M on C–H activation

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 10,   Pages 1485-1492 doi: 10.1007/s11705-022-2169-8

Abstract: The role of M on the first C–H bond cleavage of CH4 was investigated.Doping elements of the same period in Ni cluster, such as Fe, Co and Cu, for C–H bond activation followsAs a result, Ni–Fe shows the best ability for C–H bond cleavage.Consequently, C–H bond activation demands a lower energy barrier on Ni–Pt cluster.

Keywords: CH4 dissociation     Ni–M     C–H bond activation     charge transfer    

Laser ablation of block copolymers with hydrogen-bonded azobenzene derivatives

Jintang Huang, Youju Huang, Si Wu

Frontiers of Chemical Science and Engineering 2018, Volume 12, Issue 3,   Pages 450-456 doi: 10.1007/s11705-018-1735-6

Abstract:

Supramolecular assemblies (PS-b-P4VP(AzoR)) are fabricated by hydrogen-bonding azobenzene derivatives (AzoR) to poly(4-vinyl pyridine) blocks of polystyrene-block-poly(4-vinyl pyridine) (PS-b-P4VP). PS-b-P4VP(AzoR) forms phase separated nanostructures with a period of ~75–105 nm. A second length scale structure with a period of 2 µm is fabricated on phase separated PS-b-P4VP(AzoR) by laser interference ablation. Both the concentration and the substituent of AzoR in PS-b-P4VP(AzoR) affect the laser ablation process. The laser ablation threshold of PS-b-P4VP(AzoR) decreases as the concentration of AzoR increases. In PS-b-P4VP(AzoR) with different substituents (R= CN, H, and CH3), ablation thresholds follow the trend: PS-b-P4VP(AzoCN)<PS-b-P4VP(AzoCH3)<PS-b-P4VP(AzoH). This result indicates that the electron donor group (CH3) and the electron acceptor group (CN) can lower the ablation threshold of PS-b-P4VP(AzoR).

Keywords: laser ablation     block copolymers     hydrogen-bond     azobenzene derivatives     supramolecular assembly    

Shear strength model of the reinforced concrete beams with embedded through-section strengthening bars

Linh Van Hong BUI; Phuoc Trong NGUYEN

Frontiers of Structural and Civil Engineering 2022, Volume 16, Issue 7,   Pages 843-857 doi: 10.1007/s11709-022-0834-0

Abstract: A promising method based on the bond mechanism between ETS strengthening and concrete is then proposedAn expression for the maximum bond stress of the ETS bars to concrete is developed.This new expression eliminates the difficulty in the search and selection of appropriate bond parameters

Keywords: embedded through-section     strengthening     fiber-reinforced polymer     finite element     shear strength model     bond    

Stress analysis of deck pavement of continuous steel box girder

Li Guofen,Cao Mu, Wang Hongchang,Zhu Huaping

Strategic Study of CAE 2013, Volume 15, Issue 8,   Pages 79-83

Abstract:

The geometric structure of steel deck plates is complex. So it is difficult to get precise results in the mechanics calculation of deck pavement with traditional methods. This paper adopts the finite element method for the mechanics analysis of the composite guss asphalt surfacing layer of curved steel box girder bridges. By taking the orthotropic steel deck and the pavement as a whole, a reasonable finite element model which established can be used to study the stress and deformation features of the surfacing layer. According to the common diseases in steel deck pavements and the effect of the overload and the horizontal load in braking to the pavement, this paper puts forward the comprehensive control indicators for pavement failures.

Keywords: bridge deck pavement     curved continuous steel box girder     surfacing cracking     bond slip     stress and the    

Title Author Date Type Operation

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

Gudimella RAMAKRISHNA, Sriraman PRIYADHARSHINI

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

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

Chen Jing

Journal Article

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

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

Calculation of H2+ Structural Parameters based on Hydrogen Atomic Protonized Model

Chen Jing

Journal Article

Steel Fiber–Matrix Interfacial Bond in Ultra-High Performance Concrete: A Review

Yulin Deng,Zuhua Zhang,Caijun Shi,Zemei Wu,Chaohui Zhang

Journal Article

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

Journal Article

A density functional theory study of methane activation on MgO supported NiM cluster: role of M on C–H activation

Journal Article

Laser ablation of block copolymers with hydrogen-bonded azobenzene derivatives

Jintang Huang, Youju Huang, Si Wu

Journal Article

Shear strength model of the reinforced concrete beams with embedded through-section strengthening bars

Linh Van Hong BUI; Phuoc Trong NGUYEN

Journal Article

Stress analysis of deck pavement of continuous steel box girder

Li Guofen,Cao Mu, Wang Hongchang,Zhu Huaping

Journal Article