9,288 research outputs found

    Phase behaviour of attractive and repulsive ramp fluids: integral equation and computer simulation studies

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    Using computer simulations and a thermodynamically self consistent integral equation we investigate the phase behaviour and thermodynamic anomalies of a fluid composed of spherical particles interacting via a two-scale ramp potential (a hard core plus a repulsive and an attractive ramp) and the corresponding purely repulsive model. Both simulation and integral equation results predict a liquid-liquid de-mixing when attractive forces are present, in addition to a gas-liquid transition. Furthermore, a fluid-solid transition emerges in the neighbourhood of the liquid-liquid transition region, leading to a phase diagram with a somewhat complicated topology. This solidification at moderate densities is also present in the repulsive ramp fluid, thus preventing fluid-fluid separation.Comment: 29 pages, 10 figure

    EVALUATION OF A NATIONAL SCHOOL DRUG EDUCATION PROGRAM IN AUSTRALIA

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    The National Initiatives in Drug Education (NIDE) project was an initiative of the Australian Commonwealth government, to enhance school drug education in all Australian jurisdictions. The project was implemented in collaboration with States and Territories and primarily involved professional training for teachers of drug education and the development of teaching resources. The project was evaluated towards the end of its implementation period. An essentially descriptive approach was adopted, using several different investigative techniques to confirm the strength of evidence and build a global picture. While there are inherent limitations to such a retrospective approach, considerable insight was gained as to the achievements of the project. In an overall sense, people in all jurisdictions, at all levels of involvement in drug education, considered NIDE a beneficial project. NIDE increased the quantity and quality of drug education. The teaching resource materials developed by NIDE were generally well regarded. The process of implementation was respectful and empowering. State and Territory representatives felt part of a coherent national project. The harm minimisation premise of the project was well accepted. NIDE also had a number of limitations, but it has contributed in a major way to the ongoing evolution of school drug education in Australia

    Substance Abuse: A Major Global Health Issue

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    Community experiences of organised crime in Scotland

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    The research explored community experiences of serious organised crime in Scotland (SOC). The report provides information on the nature and extent of the impact of SOC on everyday life in the community, as well as offering suggestions for policy development. The study sought to answer the following questions: 1)What are the relationships that exist between SOC and communities in Scotland? 2)What are the experiences and perceptions of residents, stakeholders and organisations of the scope and nature of SOC within their local area? and 3)How does SOC impact on community wellbeing, and to what extent can the harms associated with SOC be mitigated

    NGC 3105: a young open cluster with low metallicity

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    NGC 3105 is a young open cluster hosting blue, yellow and red supergiants. This rare combination makes it an excellent laboratory to constrain evolutionary models of high-mass stars. It is poorly studied and fundamental parameters such as its age or distance are not well defined. We intend to characterize in an accurate way the cluster as well as its evolved stars, for which we derive for the first time atmospheric parameters and chemical abundances. We identify 126 B-type likely members within a radius of 2.7±\pm0.6 arcmin, which implies an initial mass, Mcl≈M_{cl}\approx4100 M⊙_{\odot}. We find a distance of 7.2±\pm0.7 kpc for NGC 3105, placing it at RGCR_{GC}=10.0±\pm1.2 kpc. Isochrone fitting supports an age of 28±\pm6 Ma, implying masses around 9.5 M⊙_{\odot} for the supergiants. A high fraction of Be stars (≈\approx25 %) is found at the top of the main sequence down to spectral type b3. From the spectral analysis we estimate for the cluster a vradv_{rad}=+46.9±\pm0.9 km s−1^{-1} and a low metallicity, [Fe/H]=-0.29±\pm0.22. We also have determined, for the first time, chemical abundances for Li, O, Na, Mg, Si, Ca, Ti, Ni, Rb, Y, and Ba for the evolved stars. The chemical composition of the cluster is consistent with that of the Galactic thin disc. An overabundance of Ba is found, supporting the enhanced ss-process. NGC 3105 has a low metallicity for its Galactocentric distance, comparable to typical LMC stars. It is a valuable spiral tracer in a very distant region of the Carina-Sagittarius spiral arm, a poorly known part of the Galaxy. As one of the few Galactic clusters containing blue, yellow and red supergiants, it is massive enough to serve as a testbed for theoretical evolutionary models close to the boundary between intermediate and high-mass stars.Comment: 18 pages, 13 figures. Accepted for publication in A&
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