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1 – 10 of 17J.I. Ramos and Carmen María García López
The purpose of this paper is to analyze numerically the blowup in finite time of the solutions to a one-dimensional, bidirectional, nonlinear wave model equation for the…
Abstract
Purpose
The purpose of this paper is to analyze numerically the blowup in finite time of the solutions to a one-dimensional, bidirectional, nonlinear wave model equation for the propagation of small-amplitude waves in shallow water, as a function of the relaxation time, linear and nonlinear drift, power of the nonlinear advection flux, viscosity coefficient, viscous attenuation, and amplitude, smoothness and width of three types of initial conditions.
Design/methodology/approach
An implicit, first-order accurate in time, finite difference method valid for semipositive relaxation times has been used to solve the equation in a truncated domain for three different initial conditions, a first-order time derivative initially equal to zero and several constant wave speeds.
Findings
The numerical experiments show a very rapid transient from the initial conditions to the formation of a leading propagating wave, whose duration depends strongly on the shape, amplitude and width of the initial data as well as on the coefficients of the bidirectional equation. The blowup times for the triangular conditions have been found to be larger than those for the Gaussian ones, and the latter are larger than those for rectangular conditions, thus indicating that the blowup time decreases as the smoothness of the initial conditions decreases. The blowup time has also been found to decrease as the relaxation time, degree of nonlinearity, linear drift coefficient and amplitude of the initial conditions are increased, and as the width of the initial condition is decreased, but it increases as the viscosity coefficient is increased. No blowup has been observed for relaxation times smaller than one-hundredth, viscosity coefficients larger than ten-thousandths, quadratic and cubic nonlinearities, and initial Gaussian, triangular and rectangular conditions of unity amplitude.
Originality/value
The blowup of a one-dimensional, bidirectional equation that is a model for the propagation of waves in shallow water, longitudinal displacement in homogeneous viscoelastic bars, nerve conduction, nonlinear acoustics and heat transfer in very small devices and/or at very high transfer rates has been determined numerically as a function of the linear and nonlinear drift coefficients, power of the nonlinear drift, viscosity coefficient, viscous attenuation, and amplitude, smoothness and width of the initial conditions for nonzero relaxation times.
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Svetlin Georgiev, Aissa Boukarou, Keltoum Bouhali and Khaled Zennir
This paper is devoted to the generalized Kadomtsev–Petviashvili I equation. This study aims to propose a new approach for investigation for the existence of at least one global…
Abstract
Purpose
This paper is devoted to the generalized Kadomtsev–Petviashvili I equation. This study aims to propose a new approach for investigation for the existence of at least one global classical solution and the existence of at least two nonnegative global classical solutions. The main arguments in this paper are based on some recent theoretical results.
Design/methodology/approach
This paper is devoted to the generalized Kadomtsev–Petviashvili I equation. This study aims to propose a new approach for investigation for the existence of at least one global classical solution and the existence of at least two nonnegative global classical solutions. The main arguments in this paper are based on some recent theoretical results.
Findings
This paper is devoted to the generalized Kadomtsev–Petviashvili I equation. This study aims to propose a new approach for investigation for the existence of at least one global classical solution and the existence of at least two nonnegative global classical solutions. The main arguments in this paper are based on some recent theoretical results.
Originality/value
This article is devoted to the generalized Kadomtsev–Petviashvili I equation. This study aims to propose a new approach for investigation for the existence of at least one global classical solution and the existence of at least two nonnegative global classical solutions. The main arguments in this paper are based on some recent theoretical results.
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Zbigniew Bieniek, Ida Mascolo and Ada Amendola
This study aims to focus on a short review on recent results dealing with the mechanical modelling and experimental characterization of a novel class of tensegrity structures…
Abstract
Purpose
This study aims to focus on a short review on recent results dealing with the mechanical modelling and experimental characterization of a novel class of tensegrity structures, named class θ = 1 tensegrity prisms. The examined structures exhibit six bars connected by two disjoint sets of strings.
Design/methodology/approach
First, the self-equilibrium problem of tensegrity θ = 1 prisms is numerically investigated for varying values of two aspect parameters and, next, their prestress stability is studied. The mechanical behavior of the examined structures in the large displacements regime under uniform compression loading is also numerically computed through a path-following procedure. Finally, the predicted constitutive response is validated through experimental tests.
Findings
The presented results highlight that the examined structures exhibit a large number of infinitesimal mechanisms from the freestanding configuration, and reveal that they exhibit tunable elastic response switching from stiffening to softening.
Originality/value
This multi-faceted elastic response is in agreement with previous literature results on the elastic response of minimal tensegrity prism, and suggests that such units can be usefully used as non-linear springs in next-generation tensegrity metamaterials.
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Kerstin Sahlin and Ulla Eriksson-Zetterquist
Recent changes in university systems, debates on academic freedom, and changing roles of knowledge in society all point to questions regarding how higher education and research…
Abstract
Recent changes in university systems, debates on academic freedom, and changing roles of knowledge in society all point to questions regarding how higher education and research should be governed and the role of scientists and faculty in this. Rationalizations of systems of higher education and research have been accompanied by the questioning and erosion of faculty authority and challenges to academic collegiality. In light of these developments, we see a need for a more conceptually precise discussion about what academic collegiality is, how it is practiced, how collegial forms of governance may be supported or challenged by other forms of governance, and finally, why collegial governance of higher education and research is important.
We see collegiality as an institution of self-governance that includes formal rules and structures for decision-making, normative and cognitive underpinnings of identities and purposes, and specific practices. Studies of collegiality then, need to capture structures and rules as well as identities, norms, purposes and practices. Distinguishing between vertical and horizontal collegiality, we show how they balance and support each other.
Universities are subject to mixed modes of governance related to the many tasks and missions that higher education and research is expected to fulfill. Mixed modes of governance also stem from reforms based on widely held ideals of governance and organization. We examine university reforms and challenges to collegiality through the lenses of three ideal types of governance – collegiality, bureaucracy and enterprise – and combinations thereof.
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Maria Vincenza Ciasullo, Raffaella Montera and Alexander Douglas
This paper aims to enhance the small and medium enterprises’ (SMEs) ability to develop resilience in the face of any turbulences, addressing the question on how these…
Abstract
Purpose
This paper aims to enhance the small and medium enterprises’ (SMEs) ability to develop resilience in the face of any turbulences, addressing the question on how these organizations can maintain business continuity when faced with a critical event.
Design/methodology/approach
A mediated regression analysis is conducted to investigate the relationships among big data analytics (BDA) capabilities, coinnovation (CI) and organizational resilience (OR) with reference to 192 big data SMEs in Europe.
Findings
Research reveals that the BDA capability and CI are positively associated with OR. Moreover, this study discovers the mediating impact of CI on the relationship between BDA capability and OR.
Originality/value
This paper provides important implications for considering CI as a viable strategy especially in a time of crisis and shows how SMEs are more able to recognize business opportunities. The microfoundations of the resilience building capacity of SMEs are also identified. These microfoundations become recommendations for practitioners to enhance SMEs’ responsiveness in light of coronavirus-related crises.
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Jim Dator and Ian Yeoman
Futurist Jim Dator provides a personal insight of how he “sees” the past, present, and futures of Hawaiian tourism. The paper aims to discuss this issue.
Abstract
Purpose
Futurist Jim Dator provides a personal insight of how he “sees” the past, present, and futures of Hawaiian tourism. The paper aims to discuss this issue.
Design/methodology/approach
Ian Yeoman interviews one of the world's most prominent and respected futurists, Professor Jim Dator, from the Futures Research Center of the University of Hawaii at Manoa's Political Science Department.
Findings
Like a climatologist, futurists discuss long‐term futures which are very uncertain, controversial, and often frightening stories. The past tells how the present occurred. Understanding that story is essential before considering the future. The growth of tourism is a fabulous story dependent on many developments whose future is uncertain. The tourism industry may want a “more of the same” trajectory of continued economic growth but a number changes are on the horizon which Dator calls “The Unholy Trinity,” namely the end of cheap and abundant energy; a profoundly unstable environment and a dysfunctional global economic system. Dator concludes that no government now governs satisfactorily, and so the future of tourism is extremely precarious and uncertain.
Originality/value
The interview provides both insight into how tourism has evolved and foresight of what could occur in the futures. Central to the interview is Dator's identification of the Unholy Trinity, Plus One, that suggests that the future will not neither be like the present nor like the future the tourism industry has hoped for in terms of continued economic growth. The originality and value of Dator's frank views are thought provoking, going beyond present wisdom and comfort.
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Karen Hughes and Gianna Moscardo
The purpose of this paper is to speculate how recent and emerging trends in information and communication technology (ICT) could change the way tourism businesses and…
Abstract
Purpose
The purpose of this paper is to speculate how recent and emerging trends in information and communication technology (ICT) could change the way tourism businesses and organizations communicate with and manage their guests.
Design/methodology/approach
This paper applies elements of futures and design thinking to analyze current tourism management practices and identify critical touchpoints that link tourist decisions to management strategies.
Findings
Fictional travel stories were used to identify and analyze how technology might affect tourism through five touchpoints– choice, connection, co-creation, customization and compliance. These stories were analyzed to identify changing forces and suggest potential paradigm shifts that tourism managers need to consider. These included increasingly complex content, the importance of compatible connections, and the critical role of coordination and cooperation in future tourism systems.
Originality/value
While there have been numerous discussions of how tourists and tourism businesses access and use technology, there is little evidence of scholars and practitioners applying formal futures thinking to ICT and tourism. This paper used design thinking and stories to predict and illustrate ways in which technology could be embedded into tourism experiences and services. It suggests that technology can, and probably will, fundamentally change the way in which we manage tourists and their experiences.
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The purpose of this paper is to explore the potential of creativity in work-based research and practice to yield deeper understanding of practice situations. Unexpected insights…
Abstract
Purpose
The purpose of this paper is to explore the potential of creativity in work-based research and practice to yield deeper understanding of practice situations. Unexpected insights can lead one (or a team) to identify new approaches, tackling workplace issues differently, leading to unexpected outcomes of long-term impact.
Design/methodology/approach
This paper draws on work conducted for a doctoral thesis, investigating the impact of work-based learning for recent masters graduates of a work-based learning programme. Fiction was incorporated into analysis of the data, creating play scripts to represent key aspects of the researcher's perceptions and interpretations for each participant.
Findings
Research participants experienced personal, professional and organisational impact, although there was considerable variability between individuals. Additionally, societal impact was wished for and/or effected. The approach to representation of analysis, which involved fictionalising participants' experiences, created a strong Thirdspace liminality. This appeared to deepen awareness and understanding.
Research limitations/implications
Such approaches can transform the researcher's perspective, prompting insights which lead to further adventure and development in work-based research and practice.
Practical implications
Managers and employees taking creative approaches in the workplace can prompt wide-ranging development and, with professional judgement, be constructive.
Social implications
Managers and employees taking creative approaches in the workplace can prompt wide-ranging development and, with professional judgement, be constructive.
Originality/value
The creation of play scripts, representing an interpretation of participants' stories about their work-based learning experience, is an innovative feature of this work.
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Susanna Toivanen, Hanne Berthelsen and Tuija Muhonen
This study aims to investigate university staff relocation from multiple separate buildings to a new building with activity-based flexible offices (AFOs) at a University in…
Abstract
Purpose
This study aims to investigate university staff relocation from multiple separate buildings to a new building with activity-based flexible offices (AFOs) at a University in Sweden. The aim was to assess staff perceptions of the physical and psychosocial work environment and whether there were any changes in these perceptions before and after the move.
Design/methodology/approach
A mixed-methods design was used, analyzing closed-ended survey data at two time points (T1, n = 169 and T2, n = 160) and open-ended responses (n = 180) at T2.
Findings
The main findings revealed that employees started working more from home and that there were significant decreases in perceptions of the physical and psychosocial work environment, as well as job satisfaction, after the move to the new premises.
Practical implications
A comprehensive analysis of existing work processes, tasks and collaborations is crucial when planning new university premises. The planning process needs to be done in close collaboration with different stakeholders with multiple perspectives.
Originality/value
Introduction of AFOs in an academic setting can lead to negative consequences for occupational health and efficiency.
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