The Experts below are selected from a list of 276 Experts worldwide ranked by ideXlab platform

Nail Akhmediev - One of the best experts on this subject based on the ideXlab platform.

  • rogue wave observation in a water wave tank
    Physical Review Letters, 2011
    Co-Authors: Amin Chabchoub, Norbert Hoffmann, Nail Akhmediev
    Abstract:

    The Conventional Definition of rogue waves in the ocean is that their heights, from crest to trough, are more than about twice the significant wave height, which is the average wave height of the largest one- third of nearby waves. When modeling deep water waves using the nonlinear Schrodinger equation, the most likely candidate satisfying this criterion is the so-called Peregrine solution. It is localized in both space and time, thus describing a unique wave event. Until now, experiments specifically designed for observation of breather states in the evolution of deep water waves have never been made in this double limit. In the present work, we present the first experimental results with observations of the Peregrine soliton in a water wave tank.

Amin Chabchoub - One of the best experts on this subject based on the ideXlab platform.

  • rogue wave observation in a water wave tank
    Physical Review Letters, 2011
    Co-Authors: Amin Chabchoub, Norbert Hoffmann, Nail Akhmediev
    Abstract:

    The Conventional Definition of rogue waves in the ocean is that their heights, from crest to trough, are more than about twice the significant wave height, which is the average wave height of the largest one- third of nearby waves. When modeling deep water waves using the nonlinear Schrodinger equation, the most likely candidate satisfying this criterion is the so-called Peregrine solution. It is localized in both space and time, thus describing a unique wave event. Until now, experiments specifically designed for observation of breather states in the evolution of deep water waves have never been made in this double limit. In the present work, we present the first experimental results with observations of the Peregrine soliton in a water wave tank.

Norbert Hoffmann - One of the best experts on this subject based on the ideXlab platform.

  • rogue wave observation in a water wave tank
    Physical Review Letters, 2011
    Co-Authors: Amin Chabchoub, Norbert Hoffmann, Nail Akhmediev
    Abstract:

    The Conventional Definition of rogue waves in the ocean is that their heights, from crest to trough, are more than about twice the significant wave height, which is the average wave height of the largest one- third of nearby waves. When modeling deep water waves using the nonlinear Schrodinger equation, the most likely candidate satisfying this criterion is the so-called Peregrine solution. It is localized in both space and time, thus describing a unique wave event. Until now, experiments specifically designed for observation of breather states in the evolution of deep water waves have never been made in this double limit. In the present work, we present the first experimental results with observations of the Peregrine soliton in a water wave tank.

Justin Canty - One of the best experts on this subject based on the ideXlab platform.

  • Children, social media and the trouble with defining bullying: pre-conference workshop
    2020
    Co-Authors: Justin Canty
    Abstract:

    Online bullying is a hot topic for research as well as in wider society due to concern for its impact on children’s social and emotional wellbeing. Most research and interventions use a Conventional Definition of bullying, one that has been constructed by adults. Children’s perspectives on their own experiences have been marginalised in the process. Research and intervention tends to tell children what bullying is rather than listening to their perspectives and their methods for defining what is or is not bullying. In this presentation, I explore some problems associated with the Conventional Definition and its uses in research through examination of some historical context and blind spots, using lenses of gender, culture, and context, including the social media context. I will discuss the importance of positioning children’s accounts as sources of valid knowledge and of taking a child-centred approach to investigation of the troubles associated with online bullying and social media.

  • the trouble with bullying deconstructing the Conventional Definition of bullying for a child centred investigation into children s use of social media
    Children & Society, 2016
    Co-Authors: Justin Canty, Maria Stubbe, Denise Steers, Sunny Collings
    Abstract:

    This article deconstructs the Conventional Definition of bullying through analysis of its historical context, and identifies blind spots using lenses of gender, culture and setting. We explore theoretical and methodological problems associated with the Conventional Definition and its axiomatic use in bullying research, with particular reference to online bullying. We argue that because children may use ‘bullying’ to mean many different practices not captured in the Conventional Definition, using this Definition often obscures the very phenomena researchers are aiming to describe. As a result, adults risk missing these practices in research and for interventions that use these studies as their evidence base.

  • The Trouble with Bullying – Deconstructing the Conventional Definition of Bullying for a Child‐centred Investigation into Children's Use of Social Media
    Children & Society, 2014
    Co-Authors: Justin Canty, Maria Stubbe, Denise Steers, Sunny Collings
    Abstract:

    This article deconstructs the Conventional Definition of bullying through analysis of its historical context, and identifies blind spots using lenses of gender, culture and setting. We explore theoretical and methodological problems associated with the Conventional Definition and its axiomatic use in bullying research, with particular reference to online bullying. We argue that because children may use ‘bullying’ to mean many different practices not captured in the Conventional Definition, using this Definition often obscures the very phenomena researchers are aiming to describe. As a result, adults risk missing these practices in research and for interventions that use these studies as their evidence base.

Wilhelm T. Nell - One of the best experts on this subject based on the ideXlab platform.

  • Adoption Of Veterinary Surgeon Services By Sheep And Goat Farmers In Qwaqwa
    Agrekon, 1998
    Co-Authors: Wilhelm T. Nell, Herman D. Van Schalkwyk, John H. Sanders, L. Schwalbach, C.j. Beste
    Abstract:

    A number of technology transfer (diffusion) programmes involving amongst others veterinary surgeon services subsidised by the government, were launched in the former homelands of South Africa between 1980 and 1993. Many of these programmes were discontinued after the general election of 1994. In order to evaluate the adoption of technology in Qwaqwa, a former Sotho speaking homeland, two Logit models were fit using the Conventional Definition of an adopter and an adapted Definition, which included potential adopters with the adopters. Where the Conventional Definition of adoption was estimated, livestock income per LSU, ram technology, roads and suppliers of livestock inputs are significant variables contributing to adoption. The results of the adapted model reveal that farming efficiency (weaning percentage), type of farmer (sheep as percentage of the total small ruminant herd) and ram technology, prove to be significant variables predicting adoption. It was also found that the characteristics of potential adopters gravitate more to adopters than to non-adopters. These results indicated that the adapted Definition presented a more accurate prediction than the Conventional Definition. The results of this study indicate the policy necessary to further accelerate the diffusion of veterinary surgeon services by means of the development of a better infrastructure, the reintroduction of subsidised veterinary surgeon services at the sheering sheds as well as a better flow of information to farmers in Qwaqwa.

  • ADOPTION OF VETERINARY SURGEON SERVICES BY SHEEP AND GOAT FARMERS IN QWAQWA / AANVAARDING VAN VEEARTSENYKUNDIGE DIENSTE DEUR SKAAP- EN BOKBOERE IN QWAQWA
    Agrekon, 1998
    Co-Authors: Wilhelm T. Nell, Herman D. Van Schalkwyk, John H. Sanders, L. Schwalbach, C. J. Bester
    Abstract:

    A number of technology transfer (diffusion) programmes involving amongst others veterinary surgeon services subsidised by the government, were launched in the former homelands of South Africa between 1980 and 1993. Many of these programmes were discontinued after the general election of 1994. In order to evaluate the adoption of technology in Qwaqwa, a former Sotho speaking homeland, two Logit models were fit using the Conventional Definition of an adopter and an adapted Definition, which included potential adopters with the adopters. Where the Conventional Definition of adoption was estimated, livestock income per LSU, ram technology, roads and suppliers of livestock inputs are significant variables contributing to adoption. The results of the adapted model reveal that farming efficiency (weaning percentage), type of farmer (sheep as percentage of the total small ruminant herd) and ram technology, prove to be significant variables predicting adoption. It was also found that the characteristics of potenti...