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A novel structural modification to eliminate the early coupling between bending and torsional mode shapes in a cable stayed bridge

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2, Pages 131-142 doi: 10.1007/s11709-016-0376-4

Abstract: steel beams declared a safer structure against vertical and torsional vibrations and rarely expected flutter

Keywords： aeroelastic instability structural damping flutter wind speed bending stiffness torsional stiffness

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Wind resistance challenges and fundamental research on long-span bridges

Xiang Haifan,Ge Yaojun

Strategic Study of CAE 2011, Volume 13, Issue 9, Pages 8-21

Abstract: instability and control of suspension bridges, wind induced vibration of cable-stayed bridges and controlvibration, vortex shedding vibration and control of arch bridges, and the refinements on aerodynamic flutterThe long-span cable-stayed bridges with a 1 000 m main span have high enough critical flutter speed,analysis method as 3D bridge flutter precise analysis, the bridge buffeting frequency-domain analysisunder skew wind action, the bridge flutter and buffeting reliability evaluation method based on second

Keywords： suspension bridge cable stayed bridge arch bridge flutter instability buffeting response vortex

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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 comparedthe nonlinearity properties of self-excited aerodynamic force of bridge according to the generalized flutter

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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Combustion instability detection using the wavelet detail of pressure fluctuations

JI Junjie, LUO Yonghao

Frontiers in Energy 2008, Volume 2, Issue 1, Pages 116-120 doi: 10.1007/s11708-008-0019-0

Abstract: A combustion instability detection method that uses the wavelet detail of combustion pressure fluctuations

Keywords： comparison wavelet approximation pressure transducer general pressure consistent

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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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Progress and Prospect of Seafloor Instability Research

Gao Weijian, Li Wei

Strategic Study of CAE 2023, Volume 25, Issue 3, Pages 109-121 doi: 10.15302/J-SSCAE-2023.03.010

Abstract:

Seafloor instability and secondary submarine geohazards are widely presentHowever, formation mechanisms and controlling factors of seafloor instability are still poorly understoodTo improve the understanding, based on the history and development of seafloor instability, thisengineering geohazards risks, and summarizes popular quantitative analysis methods for seafloor instability, this study proposed the development direction and countermeasures of future seafloor instability

Keywords： seafloor instability submarine geohazards formation mechanisms risk assessment instability analysis

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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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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 flutterThe 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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Size-dependent Elastic Instability of Gel CylinderWith Surface Stress

Huang Dianwu,Qiao Ling, Wang Shiji

Strategic Study of CAE 2007, Volume 9, Issue 4, Pages 50-54

Abstract:

The elastic instability of a gel cylinder was researched with classicalThe non-classic boundary condition of the elastic instability has been educed by the energy functional So a criterion equation of the elastic instability can be got.Through the analysis of the equation, it is found that the elastic instability is relevant to the radius

Keywords： gel cylinder elastic instability intrinsic scale surface effect

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Modulational Instability of Optical Vortices in Engineered Saturable Media Review

D.G. Pires, N.M. Litchinitser

Engineering 2022, Volume 17, Issue 10, Pages 31-43 doi: 10.1016/j.eng.2022.04.022

Abstract:

Propagation of light beams in turbid media such as underwater environments, fog, clouds, or biological tissues finds increasingly important applications in science and technology, including bio-imaging, underwater and free-space communication technologies. While many of these applications traditionally relied on conventional, linearly polarized Gaussian beams, light possesses many degrees of freedom that are still largely unexplored, such as spin angular momentum (SAM) and orbital angular momentum (OAM). Here, we present nonlinear light–matter interactions of such complex light beams with "rotational" degrees of freedom in engineered nonlinear colloidal media. By making use of both variational and perturbative approach, we consider non-cylindrical optical vortices, elliptical optical vortices, and higher-order Bessel beams integrated in time (HOBBIT) to predict the dynamics and stability of the evolution of these beams. These results may find applications in many scenarios involving light transmission in strongly scattering environments.

Keywords： Optical vortex Orbital angular momentum Modulation instability Turbid media

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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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Underlying mechanism of the hydrothermal instability of Cu

Nadeen Al-Janabi,Abdullatif Alfutimie,Flor R. Siperstein,Xiaolei Fan

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 1, Pages 103-107 doi: 10.1007/s11705-015-1552-0

Abstract: Water induced decomposition of Cu (BTC) (BTC= benzene-1,3,5-tricarboxylate) metal-organic framework (MOF) was studied using dynamic water vapour adsorption. Small-angle X-ray scattering, Fourier transform infrared spectroscopy and differential scanning calorimetry analyses revealed that the underlying mechanism of Cu (BTC) MOF decomposition under humid streams is the interpenetration of water molecules into Cu-BTC coordination to displace organic linkers (BTC) from Cu centres.

Keywords： hydrothermal stability metal-organic framework (MOF) open metal sites (OMSs) dynamic water vapour adsorption

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Mechanisms and impacts of chromosomal translocations in cancers

Jing H. Wang

Frontiers of Medicine 2012, Volume 6, Issue 3, Pages 263-274 doi: 10.1007/s11684-012-0215-5

Abstract:

Chromosomal aberrations have been associated with cancer development since their discovery more than a hundred years ago. Chromosomal translocations, a type of particular structural changes involving heterologous chromosomes, have made a critical impact on diagnosis, prognosis and treatment of cancers. For example, the discovery of translocation between chromosomes 9 and 22 and the subsequent success of targeting the fusion product BCR-ABL transformed the therapy for chronic myelogenous leukemia. In the past few decades, tremendous progress has been achieved towards elucidating the mechanism causing chromosomal translocations. This review focuses on the basic mechanisms underlying the generation of chromosomal translocations. In particular, the contribution of frequency of DNA double strand breaks and spatial proximity of translocating loci is discussed.

Keywords： DNA double strand breaks chromosomal translocations genomic instability spatial proximity carcinogenesis