3,736 research outputs found

    Efficacy of Suicide Prevention Trainings: An Analysis of Gatekeeper and Bystander Intervention Modalities

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    Many organizations and resources exist to help mitigate the factors leading to the completion of suicide. Yet, the proficient identification of risk factors and warning signs, alongside the impactful intervention by gatekeepers, has emerged as a formidable strategy in the battle against suicide. How best to train these gatekeepers to ensure their efficacy and confidence in intervention is an area of active research and was the primary purpose of the present study. The participants were a sample of 100 undergraduate students from Abilene Christian University and were separated into three training groups. Each was assigned a different suicide prevention training module developed locally by the investigator. Two of the modules represented prevailing prevention ideologies, Gatekeeper and Bystander Intervention, while the last group was a combination of both. Concept knowledge and intervention confidence were assessed both pre-and post-training by investigator-developed screeners. Analysis of performance changes between phases determined a significant main effect between pre-and post-test results. However, while the hypothesized effects of each training type on concept knowledge did show potential at p = .052, a significant main effect was not observed. Meanwhile, the magnitude of effects on intervention confidence were virtually indistinguishable between training styles. The findings suggest a possible precedent for the combination of modalities as an efficient prevention and intervention training method. Additionally, the results of the modalities investigated appear to imply that the gatekeeper ideology is sufficient as a standalone training module and requires further research

    A continuum treatment of growth in biological tissue: The coupling of mass transport and mechanics

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    Growth (and resorption) of biological tissue is formulated in the continuum setting. The treatment is macroscopic, rather than cellular or sub-cellular. Certain assumptions that are central to classical continuum mechanics are revisited, the theory is reformulated, and consequences for balance laws and constitutive relations are deduced. The treatment incorporates multiple species. Sources and fluxes of mass, and terms for momentum and energy transfer between species are introduced to enhance the classical balance laws. The transported species include: (\romannumeral 1) a fluid phase, and (\romannumeral 2) the precursors and byproducts of the reactions that create and break down tissue. A notable feature is that the full extent of coupling between mass transport and mechanics emerges from the thermodynamics. Contributions to fluxes from the concentration gradient, chemical potential gradient, stress gradient, body force and inertia have not emerged in a unified fashion from previous formulations of the problem. The present work demonstrates these effects via a physically-consistent treatment. The presence of multiple, interacting species requires that the formulation be consistent with mixture theory. This requirement has far-reaching consequences. A preliminary numerical example is included to demonstrate some aspects of the coupled formulation.Comment: 29 pages, 11 figures, accepted for publication in Journal of the Mechanics and Physics of Solids. See journal for final versio

    Biological remodelling: Stationary energy, configurational change, internal variables and dissipation

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    Remodelling is defined as an evolution of microstructure or variations in the configuration of the underlying manifold. The manner in which a biological tissue and its subsystems remodel their structure is treated in a continuum mechanical setting. While some examples of remodelling are conveniently modelled as evolution of the reference configuration (Case I), others are more suited to an internal variable description (Case II). In this paper we explore the applicability of stationary energy states to remodelled systems. A variational treatment is introduced by assuming that stationary energy states are attained by changes in microstructure via one of the two mechanisms--Cases I and II. An example is presented to illustrate each case. The example illustrating Case II is further studied in the context of the thermodynamic dissipation inequality.Comment: 24 pages, 4 figures. Replaced version has corrections to typos in equations, and the corresponding correct plot of the solution--all in Section

    Non-Markovian Dynamics of Quantum Discord

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    We evaluate the quantum discord dynamics of two qubits in independent and common non-Markovian environments. We compare the dynamics of entanglement with that of quantum discord. For independent reservoirs the quantum discord vanishes only at discrete instants whereas the entanglement can disappear during a finite time interval. For a common reservoir, quantum discord and entanglement can behave very differently with sudden birth of the former but not of the latter. Furthermore, in this case the quantum discord dynamics presents sudden changes in the derivative of its time evolution which is evidenced by the presence of kinks in its behavior at discrete instants of time.Comment: 6 pages, 4 figure
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