Francis Sabourin, Jérôme Carbonniere and Michel Brunet
The purpose of this paper is to present a quadrilateral shell element using 16 degrees of freedom (dof) (12 translations and four rotations) which makes a pair with Morley's…
Abstract
Purpose
The purpose of this paper is to present a quadrilateral shell element using 16 degrees of freedom (dof) (12 translations and four rotations) which makes a pair with Morley's triangle at 12 dof. This latter has been updated by Batoz who later proposed an extension to a quadrilateral (“DKQ16”) but only with special interpolation functions for an elastic behaviour of the material. Precisely, it is in order to release from this strong limitation that a completely different formulation is proposed here.
Design/methodology/approach
The development of this new quadrilateral called “DKS16” involves three stages. The first one starts from Morley's triangle updated by Batoz (“DKT12”) to derive a rotation‐free (RF) triangular element (“S3”). The second stage consists in generalising this triangle to a RF quadrilateral (“S4”). During the final leg, the S4 and DKT12 main features are combined to give the quadrilateral “DKS16”.
Findings
Other parameters being equal, the type of finite element chosen for the forming stage simulation has a great influence on further springback result even in software with automatic remeshing. Particularly, it is pointed out that the RF shell elements S3 and S4 as well as the triangle DKT12 are less sensitive to the mesh size than classical shell elements with six dof per node. But, even if some improvements of in‐plane shear have been proposed, stamping codes users are reluctant to use triangles. That is why this paper presents an attempt to extrapolate a quadrilateral (DKS16) from the triangle DKT12 via S3 and S4 elements formulation. Numerous examples showing convergence and accuracy are presented: irregular meshes, large displacement analyses and deep‐drawing simulations.
Practical implications
The triangular “S3” element is already implemented in RADIOSS® software and its implementation – as well as the one of “DKT12” – is in progress in Pam‐Stamp, both as “user elements”. The next step will be the implementation of the quadrilateral “S4” (RF) and, maybe, the element “DKS16” since both are cheaper in terms of computation time and are found interesting for sheet forming.
Originality/value
It seems obvious that curvatures are more exactly captured in RF elements (when nodes slide on die radius) since they are imposed in terms of translations instead of traditional nodal rotations not managed by contact conditions. As the neighbours are involved, a drawback of these RF elements is their complex formulation in case of branching surfaces and/or abrupt variations in material behaviour and/or thickness. This is not the case for elements such as DKT12 or DKS16, good candidates to add to the (long) list of cheap shell elements for large scale computations typical of sheet metal forming.
Details
Keywords
Francis Sabourin and Michel Brunet
The aim of this paper is to present an enriched formulation of a rotation‐free (RF) triangular shell element in order to use it for shells of general shapes while, up to now, it…
Abstract
Purpose
The aim of this paper is to present an enriched formulation of a rotation‐free (RF) triangular shell element in order to use it for shells of general shapes while, up to now, it is limited to shells without branching surfaces and progressive variations in terms of material behavior and thickness.
Design/methodology/approach
The formulation keeps the main characteristic of Morley's element: bending effects can be expressed with three “bending angles” only. But, for a RF element, these angles are defined with the rigid body rotations of the element itself and those of its neighbours. This usual formulation of a RF shell element can be extended provided that curvatures‐displacements relation involves the material characteristics of the element itself and of its neighbours and the same goes for thickness.
Findings
Numerous examples with regular and irregular meshes of structures involving branching surfaces point out convergence and accuracy. Large displacement analyses – including crash simulations – show the effectiveness, too. A deep‐drawing of a “U” shape and the following springback prediction highlight the fact that the curvatures are captured more exactly (when nodes slide on die radius) since they are imposed in terms of translations whereas they are traditionally computed with nodal rotations not managed by contact conditions on the tooling.
Practical implications
The “S3” element detailed here is implemented in RADIOSS® software. The general conclusions are that this triangle often gives almost the same result as “DKT18” but is two times less cheaper and it is found interesting for sheet forming simulations.
Originality/value
Specificity of such an element clearly appears while lifting the initial restrictions quoted before.
Details
Keywords
Latisha Reynolds, Amber Willenborg, Samantha McClellan, Rosalinda Hernandez Linares and Elizabeth Alison Sterner
This paper aims to present recently published resources on information literacy and library instruction providing an introductory overview and a selected annotated bibliography of…
Abstract
Purpose
This paper aims to present recently published resources on information literacy and library instruction providing an introductory overview and a selected annotated bibliography of publications covering all library types.
Design/methodology/approach
This paper introduces and annotates English-language periodical articles, monographs, dissertations and other materials on library instruction and information literacy published in 2016.
Findings
The paper provides information about each source, describes the characteristics of current scholarship and highlights sources that contain unique or significant scholarly contributions.
Originality/value
The information may be used by librarians and interested parties as a quick reference to literature on library instruction and information literacy.
Details
Keywords
Identificar los aspectos que los Actores Sociales consideran en la construcción de futuros compartidos en las comunidades. En su aplicación en los países emergentes, especialmente…
Abstract
Propósito
Identificar los aspectos que los Actores Sociales consideran en la construcción de futuros compartidos en las comunidades. En su aplicación en los países emergentes, especialmente en el Sur Global, a menudo se pasan por alto las particularidades socioculturales de las comunidades y los actores, generando fricciones o conflictos sociales. Este artículo presenta dos elementos críticos que contribuyen al debate: a) la importancia de entender a los Actores Sociales dentro de un modelo de generación de futuros comunitarios en los países emergentes; b) los factores relevantes que influyen en los actores en un ejercicio de construcción de futuros en las comunidades.
Diseño/metodología/enfoque
A partir de la investigación cualitativa, se utilizó un estudio de caso de prospectiva comunitaria del futuro: El futuro de Puerto Gaitán 2037 (Meta, Colombia). Se aplicó un método de recolección de información a partir de la observación de los participantes y el análisis de la documentación. El método de análisis fue el DQA (Análisis Cualitativo Deductivo).
Hallazgos
La participación de Los Actores Sociales presenta un modelo de cinco elementos relevantes que influyen en los actores para la construcción exitosa de futuros en las comunidades. Los primeros cuatro factores, revelados por la teoría, existen en la realidad. Asimismo, se demuestra un quinto factor: el Pensamiento a Largo Plazo, que se evidencia en un Modelo de aplicación de Estudios de Futuros para el contexto específico, aplicable al caso de comunidades en países del Sur Global.
Originalidad/valor
Si bien existen ejemplos aislados de recomendaciones respecto a estudios para generar el futuro de las comunidades, este es el primer estudio que presenta factores concretos que contribuyen a orientar la construcción de futuros comunitarios desde Actores Sociales, especialmente en países del Sur Global como Colombia. También es uno de los primeros estudios en utilizar el DQA como método de análisis en un tema de Estudios de Futuros.
Details
Keywords
Shuhong Liu, Jianqiang Mai, Jie Shao and Yulin Wu
The purpose of this paper is to predict pressure pulsation in Kaplan hydraulic turbines.
Abstract
Purpose
The purpose of this paper is to predict pressure pulsation in Kaplan hydraulic turbines.
Design/methodology/approach
State of the art numerical simulation techniques are employed to simulate three‐dimensional flows in the whole flow passage of a Kaplan turbine so that pressure pulsations can be computed in both time domain and frequency domain. Numerical results are verified by experiments carried out on the most advanced experimental platform in China.
Findings
It is found that the proposed numerical model is a viable tool for prediction of pressure pulsations. The simulation shows that the model turbine and prototype turbine have the same pressure pulsation frequencies and rotating frequencies and the same transmission patterns under similar operation conditions. However, there is no similarity for the amplitude of the pressure pulsation between the model turbine and the prototype turbine. Therefore pressure pulsations in a prototype turbine cannot be obtained by scaling the experimental results of the model turbine using a similarity relationship.
Practical implications
The findings will be very valuable for the design of hydraulic turbines and large‐scale hydraulic power stations.
Originality/value
The proposed numerical method provides a viable tool for hydraulic turbine and power station designers to predict the pressure pulsations in prototype turbines. It is a useful tool to help improve the performance of hydraulic turbines. The findings made in the numerical simulation have been verified by experiments, which is also a valuable reference for hydraulic turbine designers.
Details
Keywords
Ali B. Mahmoud, V. Kumar, Alexander Berman, Samer Elhajjar and Leonora Fuxman
This study aims to explore blockchain potential for digital marketing (BlkChn-Mk-KAP) by developing and validating a measurement model for assessing the constructs of knowledge…
Abstract
Purpose
This study aims to explore blockchain potential for digital marketing (BlkChn-Mk-KAP) by developing and validating a measurement model for assessing the constructs of knowledge, attitude and practice (KAP) related to blockchain technology in digital marketing.
Design/methodology/approach
A four-study process was used. The first study reviewed the literature to develop a pool of possible measurement items. Using exploratory factor analysis and reliability assessments, Study 2 (n = 162) investigated the dimensionality of the items developed in Study 1. The factorial structure from Study 2 was validated in Study 3 (n = 204), and the measurement model invariance was assessed using covariance-based structural equation modelling (CB-SEM). Finally, in Study 4 (n = 203), the predictive validity of the BlkChn-Mk-KAP was tested using a CB-SEM approach, testing its constructs correlations with the perceived usefulness of blockchain for digital marketing.
Findings
The findings indicate that the BlkChn-Mk-KAP measurement model comprises three-dimensional multi-item scales: knowledge, attitude and practice.
Research limitations/implications
This study introduces a promising BlkChn-Mk-KAP model to examine blockchain’s role in digital marketing. The authors acknowledge the sampling limitation in this research. To enhance the generalisability of the findings, future research should expand to different groups, including generation, gender and age. In addition, further exploration of the explicit links between blockchain knowledge, attitudes and subsequent digital marketing performance is warranted.
Practical implications
Educating employees about blockchain technology’s unique features can shape favourable attitudes and stimulate the utilisation of blockchain-enabled technologies in digital marketing practice. BlkChn-Mk-KAP can offer a reliable and valid instrument to benchmark marketers’ KAP of blockchain-powered digital marketing as they implement blockchain technology to gain a competitive advantage.
Social implications
This study helps to adopt sustainable practices ensuring the wellbeing of the key stakeholders.
Originality/value
This research introduces the first validated conceptualisation and measurement model, BlkChn-Mk-KAP, to evaluate blockchain KAPs among digital marketing professionals.
Details
Keywords
Jeffrey Braithwaite, Kristiana Ludlow, Kate Churruca, Wendy James, Jessica Herkes, Elise McPherson, Louise A. Ellis and Janet C. Long
Much work about health reform and systems improvement in healthcare looks at shortcomings and universal problems facing health systems, but rarely are accomplishments dissected…
Abstract
Purpose
Much work about health reform and systems improvement in healthcare looks at shortcomings and universal problems facing health systems, but rarely are accomplishments dissected and analyzed internationally. The purpose of this paper is to address this knowledge gap by examining the lessons learned from health system reform and improvement efforts in 60 countries.
Design/methodology/approach
In total, 60 low-, middle- and high-income countries provided a case study of successful health reform, which was gathered into a compendium as a recently published book. Here, the extensive source material was re-examined through inductive content analysis to derive broad themes of systems change internationally.
Findings
Nine themes were identified: improving policy, coverage and governance; enhancing the quality of care; keeping patients safe; regulating standards and accreditation; organizing care at the macro-level; organizing care at the meso- and micro-level; developing workforces and resources; harnessing technology and IT; and making collaboratives and partnerships work.
Practical implications
These themes provide a model of what constitutes successful systems change across a wide sample of health systems, offering a store of knowledge about how reformers and improvement initiators achieve their goals.
Originality/value
Few comparative international studies of health systems include a sufficiently wide selection of low-, middle- and high-income countries in their analysis. This paper provides a more balanced approach to consider where achievements are being made across healthcare, and what we can do to replicate and spread successful examples of systems change internationally.
Details
Keywords
Eda Atasoy, Harun Bozna, Abdulvahap Sönmez, Ayşe Aydın Akkurt, Gamze Tuna Büyükköse and Mehmet Fırat
This study aims to investigate the futuristic visions of PhD students at Distance Education department of Anadolu University on the use of learning analytics (LA) and mobile…
Abstract
Purpose
This study aims to investigate the futuristic visions of PhD students at Distance Education department of Anadolu University on the use of learning analytics (LA) and mobile technologies together.
Design/methodology/approach
This qualitative research study, designed in the single cross-section model, aimed to reveal futuristic visions of PhD students on the use of LA in mobile learning. In this respect, SCAMPER method, which is also known as a focused brainstorming technique, was used to collect data.
Findings
The findings of the study revealed that the use of LA in mobile can solve everyday problems ranging from health to education, enable personalized learning for each learner, offer a new type of evaluation and assessment and allow continuous feedback and feedforwards; yet this situation can also arise some ethical concerns since the big data collected can threaten the learners by interfering with their privacy, reaching their subconscious and manipulating them as well as the whole society by wars, mind games, political games, dictation and loss of humanity.
Research limitations/implications
The research is limited with the views of six participants. Also, the sample of the study is homogeneous in terms of their backgrounds – their age range, their departments as PhD students and their fields of expertise.
Practical implications
The positive perceptions of PhD students provide a ground for the active use of LA in mobile. Further, big data collected through LA can help educators and system makers to identify patterns which will enable tailored education for all. Also, use of LA in mobile learning may stimulate the development of a new education system including a new type of evaluation and assessment and continuous feedback and feedforwards.
Originality/value
The widespread use of mobile technologies opens new possibilities for LA in the future. The originality of this research comes from its focus on this critical point.
Details
Keywords
This paper aims to identify the aspects that social actors consider in constructing shared futures in communities. In their application in emerging countries, especially in the…
Abstract
Purpose
This paper aims to identify the aspects that social actors consider in constructing shared futures in communities. In their application in emerging countries, especially in the Global South, the socio-cultural particularities of communities and actors are often overlooked, generating friction or social conflicts. This paper presents two critical elements contributing to the debate: the importance of understanding Social Actors within a model of generating community futures in emerging countries; and the relevant factors that influence the actors in an exercise of building futures in communities.
Design/methodology/approach
From qualitative research, a case study of community foresight of the future was used: the future of Puerto Gaitán 2037 (Meta, Colombia). A method of information collection was applied from observation of the participants and analysis of documentation. The analysis method was the deductive qualitative analysis (DQA).
Findings
The participation of the social actors presents a model of five relevant elements that influence the actors for the successful construction of futures in communities. The first four factors, revealed from theory, are presented in real life. Likewise, a fifth factor is proven, Long-term thinking, which is evidenced by a model of application of futures studies for the specific context, applicable to the case of communities in countries of the Global South.
Originality/value
Although there are isolated examples of recommendations regarding studies to generate the future of communities, to the best of the author’s knowledge, this is the first study that presents concrete factors that contribute to guiding the construction of community futures from social actors, especially in countries of the Global South such as Colombia. It is also one of the first studies to use the DQA as a method of analysis in a topic of futures studies.
Details
Keywords
Sadaf Mollaei, Leia M. Minaker, Derek T. Robinson, Jennifer K. Lynes and Goretty M. Dias
The purpose of this research is to (1) identify factors affecting food choices of young adults in Canada based on environmental perceptions, personal and behavioral factors as…
Abstract
Purpose
The purpose of this research is to (1) identify factors affecting food choices of young adults in Canada based on environmental perceptions, personal and behavioral factors as determinants of eating behaviors; (2) segment Canadian young adults based on the importance of the identified factors in their food choices.
Design/methodology/approach
An online survey was administered to Canadians aged between 18 and 24 to collect data on socio-demographic factors and eating behaviors (N = 297). An exploratory factor analysis (EFA) was used to identify the main factors affecting eating behaviors in young adults, followed by K-means clustering to categorize the respondents into consumer segments based on their propensity to agree with the factors.
Findings
Six factors were extracted: beliefs (ethical, environmental and personal); familiarity and convenience; joy and experience; food influencers and sociability; cultural identity; and body image. Using these factors, six consumer segments were identified, whereby members of each segment have more similar scores on each factor than members of other segments. The six consumer segments were: “conventional”; “concerned”; “indifferent”; “non-trend follower”; “tradition-follower”; and “eat what you love”.
Originality/value
Identifying major factors influencing eating behaviors and consumer segmentation provides insights on how eating behaviors might be shaped. Furthermore, the outcomes of this study are important for designing effective interventions for shaping eating behaviors particularly improving sustainable eating habits.