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antifungal activity 2

flutter derivatives 2

organogelator 2

synthesis 2

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3-Acylthiotetronic acid 1

3-triazole derivatives 1

3D mesoporous silica 1

4-naphthoquinone derivatives 1

4-oxadiazole 1

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Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 3,   Pages 272-278 doi: 10.1007/s11709-009-0042-1

Abstract: The concept of “generalized flutter derivative” is proposed, and its physical meaning isThe graphs of the generalized flutter derivatives of plate and Sutong Bridge section model are plottedThe characteristics of all generalized flutter derivatives are compared and analyzed, and their superioritiesThe results indicate that the physical meaning of generalized flutter derivatives are more explicit comparedderivatives graphs with the wind velocity as the horizontal coordinate.

Keywords： bridge     flutter derivative     generalized flutter derivative     self-excited aerodynamic force     Sutong Bridge    

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Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Frontiers of Structural and Civil Engineering 2009, Volume 3, Issue 2,   Pages 173-179 doi: 10.1007/s11709-009-0034-1

Abstract: Flutter derivatives are essential for flutter analysis of long-span bridges, and they are generally identifiedIt was shown that all the flutter derivatives of the thin-plate model identified with the frequency-domainMoreover, some of the flutter derivatives of each of the other two models identified with the two methodsMore precisely, the frequency-domain method usually results in smooth curves of the flutter derivativesThe formulation of time-domain method makes the identification results of flutter derivatives relatively

Keywords： long-span bridges     wind-induced vibration     flutter derivatives     forced vibration test     time-domain method    

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Investigation of Turbulence Effects on the Aeroelastic Properties of a Truss Bridge Deck Section

Hoang Trong Lam, Hiroshi Katsuchi, Hitoshi Yamada

Engineering 2017, Volume 3, Issue 6,   Pages 845-853 doi: 10.1016/j.eng.2017.10.001

Abstract:

This paper presents the flutter derivatives (FDs) extracted from a stochastic system identificationThe objective of the study is to investigate the effects of oncoming turbulence on the flutter of suspended

Keywords： Flutter derivatives     System identification     Turbulence effect     Buffeting response    

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Aerodynamic problems of cable-stayed bridges spanning over one thousand meters

Chen Airong,Ma Rujin,Wang Dalei

Strategic Study of CAE 2009, Volume 11, Issue 3,   Pages 31-37

Abstract: cable-stayed bridge are investigated based on Sutong Bridge.Dynamic properies, wind loading, identification of flutterderivatives based on full aeroelastic bridge model, logitudinal structural system and vortex excitedIdentification method of flutter derivatives through full aeroelastic bridge model is proposed.

Keywords： Sutong cable-stayed bridge     dynamic properties     suitsble system     Reynolds number effect     flutter derivatives    

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Evaluation of 1,4-naphthoquinone derivatives as antibacterial agents: activity and mechanistic studies

Frontiers of Environmental Science & Engineering 2023, Volume 17, Issue 3, doi: 10.1007/s11783-023-1631-2

Abstract:

● All 1,4-naphthoquinone hybrids exhibited significant antimicrobial activity.

Keywords： 1     4-naphthoquinone derivatives     Antibacterial     Action mechanism     RecA    

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Discovery of cryptolepine derivatives as novel promising agents against phytopathogenic bacteria

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 2,   Pages 156-166 doi: 10.1007/s11705-022-2196-5

Abstract: To ensure the production of food crops, a series of cryptolepine derivatives were synthesised, afterselected as a candidate to conduct preliminary analyses of the antibacterial mechanisms of cryptolepine derivatives

Keywords： cryptolepine derivatives     phytopathogenic bacteria     antibacterial activity     mechanism of action    

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Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Frontiers of Structural and Civil Engineering 2007, Volume 1, Issue 3,   Pages 298-304 doi: 10.1007/s11709-007-0039-6

Abstract: The flutter control effect and mechanism of central-slotting, which have gradually been adopted in thedesign and construction of long-span bridges as an effective flutter controlling measure, were investigatedmodel tests and theoretical analyses based on the two-dimensional three-degrees-of-freedom coupling fluttermechanism and flutter modality of the five basic sections and their corresponding central-slotted sectionsformation and evolution of aerodynamic damping, and flutter modality especially the participation level

Keywords： aerodynamic configuration     aerodynamic performance     flutter mechanism     aerodynamic stability     theoretical    

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Synthesis, insecticidal activities and DFT study of pyrimidin-4-amine derivatives containing the 1,2,4

Frontiers of Chemical Science and Engineering 2022, Volume 16, Issue 7,   Pages 1090-1100 doi: 10.1007/s11705-021-2091-5

Abstract: Twenty six novel pyrimidin-4-amine derivatives containing the 1,2,4-oxadiazole motif were synthesized

Keywords： synthesis     pyrimidin-4-amine derivatives     1     2     4-oxadiazole     insecticidal activity     structure-activity    

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Flutter stability and management strategy for the deck of Taizhou Bridge during construction stage

Li Chengcheng,Chen Airong and Ma Rujin

Strategic Study of CAE 2012, Volume 14, Issue 5,   Pages 46-50

Abstract: justify;">In this paper, Taizhou Bridge, a three-tower suspension bridge was investigated to discover the flutterThe assessment of flutter stability during deck construction stage was performed based on analysis ofIn the end, the assessment and management strategy of flutter stability were proposed, which can be referred

Keywords： multi tower suspension bridge     construction stage     flutter stability     management strategy    

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Discovery of novel ursolic acid derivatives as effective antimicrobial agents through a ROS-mediated

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 2101-2113 doi: 10.1007/s11705-023-2361-5

Abstract: In this study, we prepared three series of ursolic acid derivatives and assessed their antibacterial

Keywords： ursolic acid     antibacterial activities     reactive oxygen species     apoptosis    

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efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 1,   Pages 66-89 doi: 10.1007/s11709-016-0356-8

Abstract: This paper studies optimization of three design parameters (mass ratio, frequency ratio and damping ratio) of multiple tuned mass dampers MTMDs that are applied in a cable stayed bridge excited by a strong wind using minimax optimization technique. ABAQUS finite element program is utilized to run numerical simulations with the support of MATLAB codes and Fast Fourier Transform FFT technique. The optimum values of these three parameters are validated with two benchmarks from the literature, first with Wang and coauthors and then with Lin and coauthors. The validation procedure detected a good agreement between the results. Box-Behnken experimental method is dedicated to formulate the surrogate models to represent the control efficiency of the vertical and torsional vibrations. Sobol’s sensitivity indices are calculated for the design parameters in addition to their interaction orders. The optimization results revealed better performance of the MTMDs in controlling the vertical and the torsional vibrations for higher mode shapes. Furthermore, the calculated rational effects of each design parameter facilitate to increase the control efficiency of the MTMDs in conjunction with the support of the surrogate models.

Keywords： MTMDs     power spectral density     fast Fourier transform     minimax optimization technique     Sobol’s sensitivity indices     Box-Behnken method    

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Computational fluid dynamic analysis of flutter characteristics for self-anchored suspension bridges

ZHU Zhiwen, WANG Zhaoxiang, CHEN Zhengqing

Frontiers of Structural and Civil Engineering 2008, Volume 2, Issue 3,   Pages 267-273 doi: 10.1007/s11709-008-0034-6

Abstract: essentials and procedures of computational fluid dynamics (CFD) simulation applicable to evaluating flutterderivatives of bridge decks.The proposed methods are employed to identify flutter derivatives of the bridge deck of the Sanchaji

Keywords： discretization     computational     description     Self-anchored Suspension     simulation applicable    

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Synthesis and ultraviolet/aggregation-induced emission investigation of novel tetraphenylvinyl hydrazone derivatives

Frontiers of Chemical Science and Engineering 2023, Volume 17, Issue 12,   Pages 2061-2073 doi: 10.1007/s11705-023-2366-0

Abstract: Herein, three novel tetraphenylethylene hydrazone chemosensors TC12, SC16, and TC16 are prepared for the selective detection of F−. Two NH and one C=N units are incorporated into the sensors for better colorimetric responses, whereas the tetraphenyl unit is in charge of the aggregation-induced emission effect. Among them, compounds SC16 and TC16 form stable gels with some organic solvents. All the tetrahydrofuran/H2O solutions of the three compounds exhibit aggregation-induced emission effect, whereby the fluorescence emission increases by varying degrees with the volume of poor solvent water. Moreover, good aggregation-induced emission effects are observed in the self-assembly of SC16 and TC16. As a sample chemosensor, TC12 in tetrahydrofuran responds to F− selectively with high sensitivity, with the colorimetric and fluorometric detection limits of 8.25 × 10−7 mol·L–1 and 2.69 × 10−7 mol·L–1, respectively. The reversible gel-sol-gel phase transition and color changes indicate that both SC16-dimethyl sulfoxide and TC16-ethyl acetate gels specifically respond to F– with good sensitivity. The detection results are well supported by ultraviolet-visible spectroscopy, fluorescent spectroscopy, and 1H nuclear magnetic resonance. More importantly, the driving forces of gelation are visually clarified through the single crystal X-ray analysis of compound TOMe.

Keywords： organogelator     tetraphenylvinyldrazone     single crystal     aggregation-induced emission effect     ion sensing    

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A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges

Igor Kavrakov, Guido Morgenthal

Engineering 2017, Volume 3, Issue 6,   Pages 823-838 doi: 10.1016/j.eng.2017.11.008

Abstract: The critical flutter velocities are also compared for the selected models under laminar flow.

Keywords： Buffeting     Flutter     Long-span bridges     Bridge aerodynamics     Bridge aeroelasticity     Erection stage    

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Effect of graphene and its derivatives on thermo-mechanical properties of phase change materials and

Frontiers in Energy 2022, Volume 16, Issue 2,   Pages 150-186 doi: 10.1007/s11708-021-0795-3

Abstract: Gr and its derivatives ((Gr oxide (GO), Gr aerogel (GA) and Gr nanoplatelets (GNPs)) based PCMs can improve

Keywords： phase change materials (PCMs)     graphene     thermal conductivity     characterization    

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Title Author Date Type Operation

Comparisons of bridges flutter derivatives and generalized ones

Fuyou XU , Zhe ZHANG , Cailiang HUANG , Airong CHEN ,

Journal Article

Time-domain and frequency-domain approaches to identification of bridge flutter derivatives

Zhengqing CHEN

Journal Article

Investigation of Turbulence Effects on the Aeroelastic Properties of a Truss Bridge Deck Section

Hoang Trong Lam, Hiroshi Katsuchi, Hitoshi Yamada

Journal Article

Aerodynamic problems of cable-stayed bridges spanning over one thousand meters

Chen Airong,Ma Rujin,Wang Dalei

Journal Article

Evaluation of 1,4-naphthoquinone derivatives as antibacterial agents: activity and mechanistic studies

Journal Article

Discovery of cryptolepine derivatives as novel promising agents against phytopathogenic bacteria

Journal Article

Flutter control effect and mechanism of central-slotting for long-span bridges

YANG Yongxin, GE Yaojun, XIANG Haifan

Journal Article

Synthesis, insecticidal activities and DFT study of pyrimidin-4-amine derivatives containing the 1,2,4

Journal Article

Flutter stability and management strategy for the deck of Taizhou Bridge during construction stage

Li Chengcheng,Chen Airong and Ma Rujin

Journal Article

Discovery of novel ursolic acid derivatives as effective antimicrobial agents through a ROS-mediated

Journal Article

efficiency optimization and Sobol’s sensitivity indices of MTMDs design parameters for buffeting and flutter

Nazim Abdul NARIMAN

Journal Article

Computational fluid dynamic analysis of flutter characteristics for self-anchored suspension bridges

ZHU Zhiwen, WANG Zhaoxiang, CHEN Zhengqing

Journal Article

Synthesis and ultraviolet/aggregation-induced emission investigation of novel tetraphenylvinyl hydrazone derivatives

Journal Article

A Comparative Assessment of Aerodynamic Models for Buffeting and Flutter of Long-Span Bridges

Igor Kavrakov, Guido Morgenthal

Journal Article

Effect of graphene and its derivatives on thermo-mechanical properties of phase change materials and

Journal Article