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1 – 10 of over 1000Heng Xiao, Zi-Tao Li, Lin Zhan and Si-Yu Wang
The purpose of this study is to show how gradual strength degradation of metal beams under cyclic bending up to fatigue failure is simulated based on a new elastoplasticity model…
Abstract
Purpose
The purpose of this study is to show how gradual strength degradation of metal beams under cyclic bending up to fatigue failure is simulated based on a new elastoplasticity model free of any yield criterion.
Design/methodology/approach
A new approach is proposed toward accurately and explicitly prescribing evolution of non-uniform stress distribution on beam cross-section under cyclic bending and, as such, gradual degradation of the bending strength can be directly determined.
Findings
Explicit results for the bending response in a whole cyclic process up to fatigue failure are obtained and the fatigue characteristic curve is for the first time simulated directly between the curvature amplitude and the cycle number to failure.
Originality/value
First, explicit and accurate determination of the non-uniform stress distribution on beam cross-section is achieved with asymptotic softening effects. Second, degradation of the bending strength can be directly deduced cycle by cycle. Finally, the relationship between the bending moment and the curvature is calculated using new and efficient numerical algorithms, thus bypassing usual time-consuming calculations with finite element procedures. Numerical results are presented and in good agreement with experimental data.
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Zi-Han Xu, Lin Zhan, Si-Yu Wang, Hui-Feng Xi and Heng Xiao
A new approach is proposed toward accurately matching any given realistic hardening and softening data from uniaxial tensile test up to failure and moreover, toward bypassing…
Abstract
Purpose
A new approach is proposed toward accurately matching any given realistic hardening and softening data from uniaxial tensile test up to failure and moreover, toward bypassing usual tedious implicit trial-and-error iterative procedures in identifying numerous unknown parameters.
Design/methodology/approach
Finite strain response features of metals with realistic hardening-to-softening transition effects up to eventual failure are studied for the first time based on the self-consistent elastoplastic J2-flow model with the logarithmic stress rate. As contrasted with usual approximate and incomplete treatments merely considering certain particular types of hardening effects such as power type hardening, here a novel and explicit approach is proposed to obtain a complete form of the plastic-work-dependent yield strength over the whole hardening and softening range.
Findings
A new multi-axial evolution equation for both hardening and softening effects is established in an explicit form. Complete results for the purpose of model validation and prediction are presented for the finite strain responses of monotonic uniaxial stretching up to failure.
Originality/value
New finite strain elastoplastic equations are established with a new history-dependent variable equivalently in place of the usual plastic work. With these equations, a unified and accurate simulation of both gardening and softening effects up to failure is achieved for the first time in an explicit sense without involving usual tedious implicit trial-and-error iterative procedures.
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This paper aims to study the effects of interest on reserves (IOR) on banks’ behavior in a theoretical framework.
Abstract
Purpose
This paper aims to study the effects of interest on reserves (IOR) on banks’ behavior in a theoretical framework.
Design/methodology/approach
This paper introduces IOR into both Cooper and Ross (1998) and Cooper and Ross (2002) and conducts quantitative analysis. It thoroughly examines the effects of IOR on banks’ resource allocation decisions under different assumptions.
Findings
In the model without deposit insurance, the results of this paper show that paying IOR facilitates the bank to use the run-proof contract. When the run-admitting contract is adopted, there is a set of conditions under which the bank is indifferent between holding illiquid asset and excess liquid reserves. In the model with deposit insurance, the results show that if the riskless illiquid investment is profitable and available, then paying IOR can hardly influence the bank's resource allocation. If the riskless illiquid investment is limited, then a certain level of IOR could fulfill some monetary targets.
Originality/value
Little research has combined IOR and model of bank runs. It helps to extend the theoretical analysis in this perspective.
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Zhongcheng Wei, Jingxia Zhan, Xi He and Jinjun Wang
The purpose of this paper is to mount Gurney flaps at the trailing edges of the canards and investigate their influence on aerodynamic characteristics of a simplified…
Abstract
Purpose
The purpose of this paper is to mount Gurney flaps at the trailing edges of the canards and investigate their influence on aerodynamic characteristics of a simplified canard-configuration aircraft model.
Design/methodology/approach
A force measurement experiment was conducted in a low-speed wind tunnel. Hence, the height and shape effects of the Gurney flaps on the canards were investigated.
Findings
Gurney flaps can increase the lift and pitching-up moment for the aircraft model tested, thereby increasing the lift when trimming the aircraft. The dominant parameter to influence aerodynamic characteristics is the height of Gurney flaps. When the flap heights are the same, the aerodynamic efficiency of the triangular Gurney flaps is higher than that of the rectangular ones. Moreover, the canard deflection efficiency will be reduced with Gurney flaps equipped, but the total aerodynamic increment is considerable.
Practical implications
This paper helps to solve the key technical problem of increasing take-off and landing lift coefficients, thus improving the aerodynamic performance of the canard-configuration aircraft.
Originality/value
This paper recommends to adopt triangular Gurney flaps with the height of 3 per cent chord length of the canard root (c) for engineering application.
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Hong Li, Changhong Li and Zhan Wang
The effective transfer of knowledge within an organization is critical for its sustainable competitive advantage. Based on the norm of reciprocity, it can be concluded that…
Abstract
Purpose
The effective transfer of knowledge within an organization is critical for its sustainable competitive advantage. Based on the norm of reciprocity, it can be concluded that individuals’ primary motivation to transfer their treasured knowledge can be summarized as “trust,” that is, the individuals trust their selfless transfer behavior can be reciprocated by the recipients in the future.
Design/methodology/approach
In this study, a simulation model based on knowledge transfer behavior and reciprocal trust between individuals is built through agent-based modeling and simulation to investigate the factors that influence the efficiency of knowledge transfer within an organization.
Findings
Experiments are performed to test the impact of reciprocal trust and organizational structure on the efficiency of knowledge transfer.
Originality/value
The results indicate a significant role of key elements of reciprocal trust and organizational structure, which provides relevant practical guidance for both individuals and organization managers in the context of knowledge transfer.
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Zhan Wang, Xiangzheng Deng and Gang Liu
The purpose of this paper is to show that the environmental income drives economic growth of a large open country.
Abstract
Purpose
The purpose of this paper is to show that the environmental income drives economic growth of a large open country.
Design/methodology/approach
The authors detect that the relative environmental income has double effect of “conspicuous consumption” on the international renewable resource stock changes when a new social norm shapes to environmental-friendly behaviors by using normal macroeconomic approaches.
Findings
Every unit of extra demand for renewable resource consumption increases the net premium of domestic capital asset. Even if the technology spillovers are inefficient to the substitution of capital to labor force in a real business cycle, the relative income with scale effect increases drives savings to investment. In this case, the renewable resource consumption promotes both the reproduction to a higher level and saving the potential cost of environmental improvement. Even if without scale effects, the loss of technology inefficient can be compensated by net positive consumption externality for economic growth in a sustainable manner.
Research limitations/implications
It implies how to earn the environment income determines the future pathway of China’s rural conversion to the era of eco-urbanization.
Originality/value
We test the tax incidence to demonstrate an experimental taxation for environmental improvement ultimately burdens on international consumption side.
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A mathematical model and numerical method for water flow and solute transport in a tidal river network is presented. The tidal river network is defined as a system of open…
Abstract
A mathematical model and numerical method for water flow and solute transport in a tidal river network is presented. The tidal river network is defined as a system of open channels or rivers with junctions and cross sections. As an example, the Pearl River in China is represented by a network of 104 channels, 62 nodes, and a total of 330 cross sections with 11 boundary sections for one of the applications. The simulations are performed with a supercomputer for seven scenarios of water flow and/or solute transport in the Pearl River, China, with different hydrological and weather conditions. Comparisons with available data are shown. The intention of this study is to summarize previous works and to provide a useful tool for water environmental management in a tidal river network, particularly for the Pearl River, China.
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Bishakha Mazumdar, Amy Warren, Kathryne Dupré and Travor Brown
In this study the authors examine whether bridge employees tend to hold non-standard jobs, and if so, whether non-standard job choice is deliberate. Moreover, the authors examine…
Abstract
Purpose
In this study the authors examine whether bridge employees tend to hold non-standard jobs, and if so, whether non-standard job choice is deliberate. Moreover, the authors examine whether fulfillment of employment expectations affects the personal and work attitudes of bridge employees.
Design/methodology/approach
The authors' research and hypotheses are supported and developed through psychological contract theory. The authors collected data from 195 bridge employees, employed in a variety of jobs, through an online survey. Hypotheses were tested using hierarchical multiple regression.
Findings
This study suggests that some bridge employees may engage in non-standard employment deliberately. Moreover, we show that fulfillment of perceived obligation by employers (psychological contract) is associated with personal and work attitudes (life satisfaction, job satisfaction, affective commitment, normative commitment and intentions to stay) of bridge employees.
Research limitations/implications
While this study supports psychological contract theory as an important framework for understanding bridge employment, sample size, cross-sectional data and a lack of diversity in the sample limit causality, generalizability and data robustness. Future research should strive to replicate and extend the current findings.
Practical implications
The present study underlines the importance of designing jobs to meet the expectations of bridge employees. Also, it highlights the preference of bridge employees to engage in non-standard employment.
Originality/value
The authors extend bridge employment research by empirically examining the relationship between unmet employment expectations and the personal and work attitudes of bridge employees.
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Bishakha Mazumdar, Amy M. Warren and Kathryne E. Dupré
Few studies aim to uniquely conceptualize the experiences of bridge employees after they enter the workforce. Supported by the psychological contract theory and the…
Abstract
Purpose
Few studies aim to uniquely conceptualize the experiences of bridge employees after they enter the workforce. Supported by the psychological contract theory and the self-determination theory, the purpose of this paper is to contribute to the understanding of the bridge employment experience by examining how the expectations of bridge employees shape their experiences.
Design/methodology/approach
This paper first reviews the extant literature on bridge employment. It then discusses the psychological contract theory and the self-determination theory, and examines the expectations of bridge employees through the theoretical perspectives of these two theories, to examine experiences in bridge employment.
Findings
Discord in the bridge employment relationship may be attributed to a lack of understanding of the implicit expectations of bridge employees. More specifically, unmet expectations may be detrimental to the bridge employment experience, and ultimately jeopardize both employer and employee outcomes.
Research limitations/implications
This paper examines expectations and experiences of bridge employees from a theoretical perspective. Theoretical tenets are utilized to analyze how and why implicit expectations may influence bridge employees in ways that result in detrimental outcomes for both employers and employees.
Practical implications
This paper sheds light on why bridge employment arrangements may result in adverse outcomes. Specifically, when there is a lack of understanding between bridge employees’ expectations and experiences, both individual and organizational outcomes may be impaired. An improved understanding of the bridge employment experience will likely result in an enhanced working relationship between bridge employees and employers, and minimize misunderstandings about this cohort of the workforce.
Originality/value
Using the guidelines of the psychological contract theory and the self-determination theory, we develop a model to examine how expectation of bridge employees may affect the experiences and ultimately, the outcomes of bridge employment. The authors also identify factors uniquely applicable to bridge employees. This is the first paper that examines the experiences of bridge employees through such theoretical perspectives.
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Khaled Lahlouh, Delphine Lacaze and Richard Huaman-Ramirez
The purpose of this paper is to explore the relationship between different categories of person–environment (P–E) fit and two types of retirement intentions (i.e. full retirement…
Abstract
Purpose
The purpose of this paper is to explore the relationship between different categories of person–environment (P–E) fit and two types of retirement intentions (i.e. full retirement and bridge employment).
Design/methodology/approach
Data were collected from a convenience sample of 357 executives aged 50 and over, employed in French private sector companies. Hypotheses were tested using structural equation modeling.
Findings
Perceptions of value congruence at vocational level and needs and supplies fit at organizational and job levels were positively related to the intention to hold bridge employment after retirement. The fit between older worker’s abilities and job demands was positively related to the two types of retirement intentions.
Originality/value
The complexity of retirement transition is taken into account with the introduction of two types of retirement intentions. P–E fit is shown to be an antecedent of career intentions after retirement.
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