5,202 research outputs found

    Event-by-Event Jet Quenching

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    High momentum jets and hadrons can be used as probes for the quark gluon plasma (QGP) formed in nuclear collisions at high energies. We investigate the influence of fluctuations in the fireball on jet quenching observables by comparing propagation of light quarks and gluons through averaged, smooth QGP fireballs with event-by-event jet quenching using realistic inhomogeneous fireballs. We find that the transverse momentum and impact parameter dependence of the nuclear modification factor R_AA can be fit well in an event-by-event quenching scenario within experimental errors. However the transport coefficient qhat extracted from fits to the measured nuclear modification factor R_AA in averaged fireballs underestimates the value from event-by-event calculations by up to 50%. On the other hand, after adjusting qhat to fit R_AA in the event-by-event analysis we find residual deviations in the azimuthal asymmetry v_2 and in two-particle correlations, that provide a possible faint signature for a spatial tomography of the fireball.Comment: 8 pages, 5 figures; v2: new figure added, small changes and fixes, this version published in Phys. Lett.

    Integrating arthropod and weed management in a water-stressed agro-ecosystem

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    Professor Hudec and the Appellate Body

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    Rearrangement collisions between gold clusters

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    Collision processes between two gold clusters are investigated using classical molecular dynamics in combination with embedded atom (EA) potentials, after checking the reliability of EA results by contrasting them with first principles calculations. The Au projectiles considered are both single atoms (N=1) and clusters of N=2, 12, 13 and 14 atoms. The targets contain N= 12, 13 and 14 gold atoms. The initial projectile energy E is in the range 0 < E < 1.5 eV/atom. The results of the collision processes are described and analyzed in detail.Comment: LATeX file, 8 figures, uses svjour.cl

    Beneficial True Bugs: Minute Pirate Bugs

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    This fact sheet describes beneficial true bugs: minute pirate bugs. It includes their life cycle and tips for promoting beneficial insects such as conservation and enhancement, predator release, and the predator release process

    Using a Sustainable Livelihoods Approach to Assessing the Impact of ICTs in Development

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    This paper describes the sustainable livelihoods framework as a useful tool in assessing the contribution of ICTs to development projects. Assessing the role of ICTs in development can be difficult because they are so multifaceted, and because the effect of ICT use is often indirect. This paper argues that applying the sustainable livelihood frameworks in assessment can help to broaden their scope in a manageable way and prove more analytically rigorous than other available methods. The example of an impact assessment of a Colombian telecentre is used to demonstrate how such an approach can be applied

    Common Crane Fly in Turf

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    Crane flies belong to one of the most specious families of flies. The adult flies, also known as “mosquito hawks”, are not giant mosquitoes and do not bite, and though the name suggests it, they do not feed on mosquitoes. In general, the larvae are associated with aquatic and semi-aquatic habitats. The majority of crane flies are not pests

    Comparing the validity of two sets of evaluation principles : adding value to both

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    This chapter provides a comparative analysis between the evidence-based principles for collaborative approaches to evaluation (CAE) and those associated with the DECI (Developing Evaluation Capacity in Information Society Research)- hybrid approach. The CAE principles were derived from a research project that gathered insights from 320 evaluators who practice CAE. The DECI principles emerged from an action and implementation project within which a number of partner projects were mentored in utilization-focused evaluation (UFE) combined with research communication. The comparison is meant to assess the extent to which there is convergent validity and to explore the complementarity of the principle sets
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