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Effects of fundamental factors on coupled vibration of wind-rail vehicle-bridge system for long-span cable-stayed bridge

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Journal of Central South University 2016年第5期23卷 1264-1272页

作者：张明金李永乐汪斌 Department of Bridge Engineering Southwest Jiaotong University

In a wind-vehicle-bridge(WVB) system,there are various interactions among wind,vehicle and *** mechanism for coupling vibration of wind-vehicle-bridge systems is explored to demonstrate the effects of fundamental factors,such as mean wind,fluctuating wind,buffeting,rail irregularities,light rail vehicle vibration and bridge stiffness.A long cable-stayed bridge which carries light rail traffic is regarded as a numerical ***,a finite element model is built for the long cable-stayed *** deck can generally be idealized as three-dimensional spine beam while cables are modeled as truss *** are modeled as mass-spring-damper *** irregularities and wind fluctuation are simulated in time domain by spectrum representation ***,aerodynamic loads on vehicle and bridge deck are measured by section model wind tunnel *** vertical and torsional flutter derivatives of bridge deck are identified by weighting ensemble least-square ***,dynamic responses of the WVB system are analyzed in a series of *** results show that the accelerations of the vehicle are excited by the fluctuating wind and the track irregularity to a great *** transverse forces of wheel axles mainly depend on the track *** displacements of the bridge are predominantly determined by the mean wind and restricted by its *** the accelerations of the bridge are enlarged after adding the fluctuating wind.

关键词： wind-vehicle-bridge system coupled vibration long-span cable-stayed bridge fundamental factors

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The impact of fundamental factors and sentiments on the valuation of cryptocurrencies

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Blockchain(Research and Applications) 2023年第4期4卷 39-49页

作者： Tiam Bakhtiar Xiaojun Luo Ismail Adelopo Department of Accounting and Finance College of Business and LawUniversity of the West of EnglandBristol BS161QYUnited Kingdom

The valuation of cryptocurrencies is important given the increasing significance of this potential asset ***,most state-of-the-art cryptocurrency valuation methods only focus on one of the fundamental factors or sentiments and use out-of-date data *** this study,a robust cryptocurrency valuation method is developed using up-to-date *** various panel regression models and moving-window regression tests,the impacts of fundamental factors and sentiments in the valuation of cryptocurrencies are explored with data covering from January 1,2009 to April 30,*** research shows the importance of sentiments and suggests that the fear and greed index can indicate when to make a cryptocurrency investment,while Google search interest in cryptocurrency is crucial when choosing the appropriate type of ***,consensus mechanism and initial coin offering have significant effects on cryptocurrencies without stablecoins,while their impacts on cryptocurrencies with stablecoins are *** fundamental factors,such as the type of supply and the presence of smart contracts,do not have a significant influence on *** from this study can enhance cryptocurrency marketisation and provide insightful guidance for investors,portfolio managers,and policymakers in assessing the utility level of each cryptocurrency.

关键词： Cryptocurrency Valuation Market sentiment fundamental factors Fear and greed index Google search index

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