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Flow Theory (flow + theory)
Selected AbstractsZhang Hongren and the Introduction of Transient Flow Theory to ChinaGROUND WATER, Issue 2 2008Chunmiao Zheng No abstract is available for this article. [source] Capital Investment and Earnings: International EvidenceCORPORATE GOVERNANCE, Issue 5 2009Ahmet Can Inci ABSTRACT Manuscript Type: Empirical Research Question/Issue: We examine the nature of the dynamic linkage (causality) between earnings and capital investment using firm-level data from around the world to see whether the legal environment, including corporate governance and monitoring mechanisms, and financial development are important in the profitability of capital investment. Research Findings/Insights: Using firms in 40 countries over the period 1988,2004, we find that the causality from earnings to capital investment is positive and strong in almost all countries, irrespective of the type of legal system and the degree of financial development. However, the causality from capital investment to earnings is generally negative for firms in civil law and financially undeveloped countries, while the causality is generally positive in common law and financially developed countries. Therefore, our international cross-country study enables us to find that the legal system and financial development are factors in the determination of the profitability of capital investment. Theoretical/Academic Implications: Our findings imply that internal financing is a significant constraint for capital investment, which provides support for the pecking order theory even for financially developed markets and for the free cash flow theory. Common law and financially developed countries tend to provide better shareholder protection with more efficient corporate governance and better investment decisions. Practitioner/Policy Implications: To encourage managers to make capital investments in value-increasing projects, it is important to further improve a legal environment that includes corporate governance, monitoring, and incentive mechanisms. Financial development that includes effective financial regulatory agencies should be sought. [source] Antecedents of flow in online shopping: a test of alternative modelsINFORMATION SYSTEMS JOURNAL, Issue 4 2009Yi Maggie Guo Abstract Flow is an optimal state of experience that has been studied in various situations, including online environments. In such environments, it has been found to be positively related to exploratory behaviour, revisit and purchase intention, and positive attitude towards web sites. Based on flow theory, this study tests the complete structure of the flow model as it was originally formulated in an online shopping context. The role of the preconditions of flow is elaborated and the effect of web site complexity, an important interface design variable, on flow is examined. Results show that web site complexity affects flow through the mediating effects of the three preconditions of flow. Theoretical and practical implications of this finding are discussed. [source] Sloshing analysis of a liquid storage container using level set X-FEMINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING, Issue 4 2009Toshio Nagashima Abstract The extended finite element method (X-FEM), in conjunction with the level set method, is applied to sloshing analysis of a rigid container filled with liquid. The governing equations for liquid with a free surface based on the potential flow theory are discretized using the framework of level set X-FEM. Once the space domain of a container is modeled by tetrahedral elements, sloshing analysis for arbitrary liquid levels and configurations can be performed without remeshing. Natural frequencies of free surface sloshing motion in rigid containers of various shapes were computed by the proposed method and the results were compared with those obtained by theoretical solutions and experiments. The proposed method was demonstrated to perform sloshing analysis efficiently for rigid containers with various liquid levels and configurations. Copyright © 2008 John Wiley & Sons, Ltd. [source] Strip layer method for simulation of the three-dimensional deformations of plate and strip rollingINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING, Issue 3 2004Liu Hong-Min Abstract A new method,the strip layer method (SLM) is used to simulate the three-dimensional deformations of plate and strip rolling process. The rolling deformation zone is divided evenly into a number of layers along the altitudinal direction of plate or strip, every layer plate (strip) is divided into a number of streamline strip elements along metal flow traces, and the streamline strip elements are mapped onto the corresponding rectangle strip elements for analysis and computation. The longitudinal distribution model of the metal lateral displacement is constructed to be a quartic curve, its lateral distribution is expressed as the third-power spline function, and its altitudinal distribution is fitted to be a parabolic curve. Based on the flow theory of plastic mechanics, the three-dimensional deformations and stresses of the deformation zone are analysed and formulated. Compared with the streamline strip element method (SSEM), the strip layer method considers the uneven distributions of stresses and deformations along altitudinal direction, and realizes an accurate analysis and computation. The simulation examples indicate that the method and the model of this paper are in accord with facts, and provide a new reliable engineering-computation method for a three-dimensional mechanics simulation of plate and strip rolling process. Copyright © 2004 John Wiley & Sons, Ltd. [source] Non-linear finite element analysis of large amplitude sloshing flow in two-dimensional tankINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING, Issue 4 2004J. R. Cho Abstract This paper is concerned with the accurate and stable finite element analysis of large amplitude liquid sloshing in two-dimensional tank under the forced excitation. The sloshing flow is formulated as an initial-boundary-value problem based upon the fully non-linear potential flow theory. The flow velocity field is interpolated from the velocity potential with second-order elements according to least square method, and the free surface conditions are tracked by making use of the direct time differentiation and the predictor,corrector method. Meanwhile, the liquid mesh is adapted such that the incompressibility condition is strictly satisfied. The accuracy and stability of the numerical method introduced are verified from the comparison with the existing reference solutions. As well, the numerical results are compared with those obtained by the linear theory with respect to the liquid fill height and the excitation amplitude. Copyright © 2004 John Wiley & Sons, Ltd. [source] Swelling effect on the dynamic behaviour of composite cylindrical shells conveying fluidINTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN FLUIDS, Issue 4 2006M. H. Toorani Abstract This paper presents a semi-analytical investigation of a fluid,structure system. Both isotropic and composite cylindrical shells filled with or subjected to a flowing fluid have been considered in this study. The structure may be uniform or non-uniform in the circumferential direction. The hybrid finite element approach, shearable shell theory and velocity potential flow theory have been combined to establish the dynamic equations of the coupled system. The set of matrices describing their relative contributions to equilibrium is determined by exact analytical integration of the equilibrium equations. The linear potential flow theory is applied to describe the fluid effects that lead to the inertial, centrifugal and Coriolis forces. The axisymmetric, beam-like and shell modes of vibrations in both cases of uniform and non-uniform cylindrical shells are investigated. Fluid elastic stability of a structure subjected to a flowing fluid is also studied. This theory yields the high and the low eigenvalues and eigenmodes with comparably high accuracy. Reasonable agreement is found with other theories and experiments. Copyright © 2005 John Wiley & Sons, Ltd. [source] Theorizing Flow and Media Enjoyment as Cognitive Synchronization of Attentional and Reward NetworksCOMMUNICATION THEORY, Issue 4 2009René Weber This article reconceptualizes the psychological concept of "flow" as it pertains to media entertainment. Our goal is to advance flow theory in ways that highlight the necessity of reliable and valid operationalization. We posit flow as a discrete, energetically optimized, and gratifying experience resulting from a cognitive synchronization of specific attentional and reward networks under condition of balance between challenge and skill. We identify video-game play as a context in which flow is likely to occur, and where we can observe our neurophysiological conceptualization of flow using measurement techniques (functional magnetic resonance imaging [fMRI]) without disrupting the experiential state. After presenting preliminary evidence consistent with our synchronization theory of flow, we suggest ways to advance this research. [source] Flow and Media EnjoymentCOMMUNICATION THEORY, Issue 4 2004John L. Sherry Media enjoyment is theorized by synthesizing empirical literature from uses and gratifications with Csikszentmihalyi's flow theory. This article argues that enjoyment of media results from a flow experience realized when media message content balances with individual ability to interpret that message. Further, it theorizes that media experience, along with individual differences in cognitive abilities, facilitates or prevents flow state in media users. Therefore, it is a balance between individual differences in cognitive abilities and media message challenges that explains enjoyment of media use. The authors offer the case of video game usage as an exemplar, and examples of cognitive tasks are provided and linked to game genre content. [source] | ||||||||||