197,851 research outputs found
Retracted. Resilience, parenting style, and children’s eating behavior
No full textAt the request of the Journal Editors and SAGE Publishing, the following article has been retracted.Wood, M., & Shukla, P. (2019). Resilience, Parenting Style, and Children’s Eating Behavior. Social Marketing Quarterly, 25(2), 123–136. https://doi.org/10.1177/1524500419831084The article has been retracted after the journal became aware that substantial portions of the article were taken from the 2015 thesis titled ‘Is parental resilience associated with child feeding practices related to an authoritative parenting style and a reduced likelihood of childhood obesity?’ by Daisy Hopson, who was a student advisee of the first author, Matthew Wood, while he was a professor overseeing her writing of the thesis and Daisy was a student at the University of Brighton.The authors informed the journal that second author, Prof. Paurav Shukla, was responsible for additional data analysis, which was not part of Hopson’s thesis. The authors further informed us that the second author took no part in the article’s literature review and discussion.Original abstract:This study aims to gain a deeper understanding of the relationship between parental resilience and parenting styles and the impact of these characteristics on children’s eating behaviors and weight. Through a quantitative examination, we found parental concerns about their child’s weight positively relate to family attitudes toward fruits and vegetables but negatively relate to actual consumption of fruits and vegetables. Contrarily, advance planning of healthy meals among parents is negatively associated with family attitudes toward fruits and vegetables but positively associated with children’s consumption of fruits and vegetables. Family attitudes toward fruits and vegetables have a significant influence on children’s consumption of fruits and vegetables. The personal competence component of parental resilience has a significant moderating influence on the relationship between parental concerns about their child’s weight and his or her consumption of fruits and vegetables. The “acceptance of self and life” component of parental resilience has a significant moderating influence on the relationship between advance planning of healthy meals among parents and children’s consumption of fruits and vegetables
Envelope solitons of nonlinear schrödinger equation with an anti-cubic nonlinearity
No full textOn the basis of a recently-proposed method to find solitary solutions of generalized nonlinear Schrödinger equations (Fedele R and Schamel H 2002 Eur. Phys. J. B 27 313, Fedele R 2002 Phys. Scr. 65 502, Fedele R, Schamel H and Shukla P K 2002 Phys. Scr. T 98 18), the existence of envelope solitonlike solutions of a nonlinear Schrödinger equation containing an anti-cubic nonlinearity (|ψ|-4ψ) plus a 'regular' nonlinear part is investigated. In particular, in the case that the regular nonlinear part consists of a sum of cubic and quintic nonlinearities (i.e. q 1|ψ|2ψ + q2|ψ|4ψ), an upper-shifted bright envelope solitonlike solution is explicitly found
Clustering of ions at atomic dimensions in quantum plasmas
No full textBy means of particle simulations of the equations of motion for ions interacting among themselves under the influence of newly discovered Shukla–Eliasson attractive force (SEAF) in a dense quantum plasma, we demonstrate that the SEAF can bring ions closer at atomic dimensions. We present simulation results of the dynamics of an ensemble of ions in the presence of the SEAF without and with confining external potentials and collisions between ions and degenerate electrons. Our particle simulations reveal that under the SEAF, ions attract each other, come closer, and form ionic clusters in the bath of degenerate electrons that shield ions. Furthermore, an external confining potential produces robust ion clusters that can have cigar- and ball-like shapes, which remain stable when the confining potential is removed. The stability of ion clusters is discussed. Our results may have applications to solid density plasmas (density exceeding 1023 per cm3), where the electrons will be degenerate and quantum forces due to the electron recoil effect caused by the overlapping of electron wave functions and electron tunneling through the Bohm potential, electron-exchange and electron-exchange and electron correlations associated with electron-1/2 spin effect, and the quantum statistical pressure of the degenerate electrons play a decisive role
P. Audinet, P. R. Shukla, F. Grare (éd.), India 's Energy. Essays on Sustainable Development
No full textÉtienne Gilbert. P. Audinet, P. R. Shukla, F. Grare (éd.), India 's Energy. Essays on Sustainable Development. In: Tiers-Monde, tome 42, n°165, 2001. La libéralisation économique en Inde : inflexion ou rupture ? sous la direction de Frédéric Landy. p. 229
Self-consistent Interaction Between the Plasma Wake Field and the driving relativistic electron-beam
No full textIt is shown that the self-consistent interaction between wake fields and the driving electron bunch in a collisionless, unmagnetized, overdense (n(p) >> n(b)) plasma is governed by three coupled equations. In the long-beam limit, they reduce to a pair consisting of an appropriate nonlinear Schrodinger equation for the beam wave function PSI, and an equation for the wake-field potential that is driven by the transverse profile of the beam density, which is proportional to \PSI\2. The pair of equations are suitable for studying the beam self-focusing (self-pinching equilibrium) for the case in which the beam-spot size is larger (smaller) than the wavelength of the wake fields. It is demonstrated that our self-consistent theory, which is based on the recently proposed thermal wave model for relativistic charged-particle beam propagation, is capable of reproducing the main results for the beam-filamentation threshold and the self-pinching equilibrium condition that are already known in the conventional theory of the beam self-interaction in collisionless plasmas
Nonlinear effects caused by intense electromagnetic waves in an electron-positron-ion plasma
No full textThe nonlinear effects caused by intense electromagnetic waves in an electron-positron-ion plasma were studied. The interaction was governed by the electromagnetic wave equation including the relativistic electron and positron mass variations, the density changes associated with the acousticlike waves and an equation for the latter in the presence of the radiation pressure. The governing nonlinear equations were analyzed to show the possibility of a novel modulational instability as well as the formation of light bullets and solitons
On K3-fibred LARGE Volume Scenario with de Sitter vacua from anti-D3-branes
No full textIn the context of type IIB superstring compactifications on K3-fibred (weak) Swiss-cheese Calabi Yau (CY) orientifolds, we consider the realisation of de Sitter vacua obtained through the introduction of an D3 ̄ -brane at the tip of a highly warped throat of Klebanov-Strassler type. Aiming to have a concrete global realisation, we perform a systematic search for the CY threefolds with 2 < h1,1< 5 arising from the Kreuzer-Skarke database, which satisfy the minimal requirements of being K3-fibred and suitable for moduli stabilisation within the LARGE Volume Scenario (LVS). In this context, after scanning the set of K3-fibred CY threefolds with a so-called diagonal del-Pezzo divisor needed for LVS, we realise that one of the main challenging requirements for having D3 ̄ -brane uplifting is to find a suitable orientifold involution which can simultaneously result in a sufficient large D3 tadpole charge along with the presence of suitable O3-planes. In our detailed analysis (limited to) using the CY threefolds with small h1,1, we observe that these topological requirements rule out most of the CY geometries leading to only few possibly suitable candidates for the purpose of D3 ̄ -brane uplifting. Subsequently, we present a global model using one such explicit K3-fibred CY threefold with h1,1 = 4 in which all the moduli can be consistently stabilised in a de Sitter minimum of the scalar potential
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