δ\delta meson effects on neutron stars in the modified quark-meson coupling model

The properties of neutron stars are investigated by including $\delta$ meson field in the Lagrangian density of modified quark-meson coupling model. The $\Sigma^-$ population with $\delta$ meson is larger than that without $\delta$ meson at the beginning, but it becomes smaller than that without $\delta$ meson as the appearance of $\Xi^-$. The $\delta$ meson has opposite effects on hadronic matter with or without hyperons: it softens the EOSes of hadronic matter with hyperons, while it stiffens the EOSes of pure nucleonic matter. Furthermore, the leptons and the hyperons have the similar influence on $\delta$ meson effects. The $\delta$ meson increases the maximum masses of neutron stars. The influence of $(\sigma^*,\phi)$ on the $\delta$ meson effects are also investigated.Comment: 10 pages, 6 figures, 4 table

School nurses' involvement, attitudes and training needs for mental health work: a UK-wide cross-sectional study

Aim.  The aim of this study was to identify school nurses’ views concerning the mental health aspects of their role, training requirements and attitudes towards depression in young people. Background.  Mental health problems in children and young people have high prevalence worldwide; in the United Kingdom they affect nearly 12% of secondary school pupils. School nurses have a wide-ranging role, and identifying and managing mental health problems is an important part of their work Methods.  A cross-sectional study was conducted using a postal questionnaire sent to a random sample of 700 school nurses throughout the United Kingdom in 2008. Questions concerned involvement in mental health work and training needs for this work. Attitudes were measured using the Depression Attitude Questionnaire Results.  Questionnaires were returned by 258 (37%) nurses. Nearly half of respondents (46%) had not received any postregistration training in mental health, yet 93% agreed that this was an integral part of their job. Most (55%) noted that involvement with young people’s psychological problems occupied more than a quarter of their work time. Staff attitudes were broadly similar to those of other primary care professionals, and indicated a rejection of stigmatizing views of depression and strong acknowledgement of the role of the school nurse in providing support. Conclusion.  Working with young people who self-harm, and recognizing and being better equipped to assist in managing depression and anxiety are key topics for staff development programmes

Applicability of Modified Effective-Range Theory to positron-atom and positron-molecule scattering

We analyze low-energy scattering of positrons on Ar atoms and N2 molecules using Modified Effective-Range Theory (MERT) developped by O'Malley, Spruch and Rosenberg [Journal of Math. Phys. 2, 491 (1961)]. We use formulation of MERT based on exact solutions of Schroedinger equation with polarization potential rather than low-energy expansions of phase shifts into momentum series. We show that MERT describes well experimental data, provided that effective-range expansion is performed both for s- and p-wave scattering, which dominate in the considered regime of positron energies (0.4 - 2 eV). We estimate the values of the s-wave scattering lenght and the effective range for e+ - Ar and e+ - N2 collisions.Comment: RevTeX, 4 pages, 2 figure

Non deterministic Repairable Fault Trees for computing optimal repair strategy

In this paper, the Non deterministic Repairable Fault Tree (NdRFT) formalism is proposed: it allows to model failure modes of complex systems as well as their repair processes. The originality of this formalism with respect to other Fault Tree extensions is that it allows to face repair strategies optimization problems: in an NdRFT model, the decision on whether to start or not a given repair action is non deterministic, so that all the possibilities are left open. The formalism is rather powerful allowing to specify which failure events are observable, whether local repair or global repair can be applied, and the resources needed to start a repair action. The optimal repair strategy can then be computed by solving an optimization problem on a Markov Decision Process (MDP) derived from the NdRFT. A software framework is proposed in order to perform in automatic way the derivation of an MDP from a NdRFT model, and to deal with the solution of the MDP

Tungsten nuclear rocket, phase I, part 1 Final report

Tungsten water moderated nuclear rocket reactor experiments and analyse

Retrospective-Cost Adaptive Control of Uncertain Hammerstein Systems Using a NARMAX Controller Structure

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/97107/1/AIAA2012-4448.pd