1,155 research outputs found
Perspectives for the detection and measurement of supersymmetry in the focus point region of mSUGRA models with the ATLAS detector at LHC
No full textThis paper discusses the ATLAS potential to study Supersymmetry for the "Focus-Point" region of the parameter space of mSUGRA models. The potential to discovery a deviation from Standard Model expectations with the first few of LHC data was studied using the parametrized simulation of the ATLAS detector. Several signatures were considered, involving hard jets, large missing energy, and either -tagged jets, opposite-sign isolated electron or muon pairs, or top quarks reconstructed exploiting their fully hadronic decays. With only 1 of data each of these signatures may allow to observe an excess of events over Standard Model expectation with a statistical significance exceeding 5 standard deviations. An analytical expression was derived for the shape of the distribution of the dilepton invariant mass arising from the three-body leptonic decay of the neutralinos under the hypothesis of heavy scalars, which is appropriate for the focus-point scenario. The resulting function was used to fit the distribution of the dilepton invariant mass obtained with simulated LHC data, and to extract the value of two kinematic endpoints measuring the and the mass differences. This information was used to constrain the MSSM parameter space compatible with the data
Size segregation of ternary mixtures in inclined chute flows: An experimental study
No full textGranular materials can segregate spontaneously due to differences in particle properties when subjected to process vibration, shear strain or because of the equipment geometries. Among the different properties, difference in particle size is the most relevant factor that drives segregation. Although size-driven segregation has serious technical implications in a lot of industrial processes, a fundamental understanding of the phenomenon is still lacking. Furthermore, models and theories on segregation are often validated with DEM simulations as an alternative to experiments. This leads to a shortage of experimental data. In this paper we experimentally investigate size-driven segregation of ternary mixtures of grains flowing down an inclined plane, for a range of mixture compositions. The segregation process is filmed through the transparent sidewall with a camera, and the evolution of the particle concentration is evaluated by means of post-processing image analysis. Since different-sized particles are of different colors, the post processing procedure consists in associating the color information of each pixel to the respective component. It is found that the segregation features are strictly related to the relative amount of the largest grains: a higher fraction of the larger particles improves mixing and reduces segregation
Evaluation of the adherence to a new potassium chloride storage and handling hospital protocol: an observational study
No full textMedical error incident reporting in a Italian Academic Hospital: does it work in a long-term period?
No full textBackground: Recent critiques of incident reporting system (IRS) suggest that its role in managing safety has been over emphasized and call for less stress on counting incidents and more importance on the effective analysis of incidents and organizational learning. Few researches have examined the effectiveness of IR in improving safety. Aim of this study is to evaluate a long-term medication error (ME) IRS in an Italian Academic Hospital (AH).
Methods: From 2010 a hospital wide IRS, voluntary and anonymous, is in operation. Safety managers in the central risk office receive and discuss all incident reports, decide further investigations, take ameliorative action, assess any measures undertaken and provide feedback. This retrospective study analysed all MEs [adverse drug events (ADEs) and near misses] database of 2010–2014 period during which none information technology (IT) system on drug management was introduced in AH.
Results: ADEs were 40,5% (83/205) in 2010 and 24,9% (68/273) in 2014 of ME near misses [p < 0,001]. Hospital IRS showed 0,197 ADEs per 100 admissions in 2010 and 0,175 per 100 admissions in 2014 [OR = 1,127 (95% CI = 0,808–1,573); p = 0,465]. In 2010 none ADEs resulted in sentinel event, while in 2014 1 ADE determined the patient's re-operation. There is not significant statistical difference in ADEs percentages distribution, between the two years, by prescribing [27,7% (23/83) vs 25% (17/68)], dispensing [16,9% (14/83) vs 19,1% (13/68)] and administering [55,4% (46/83) vs 55,9% (38/68)].
Conclusions: This study shows that IRS underrated ADEs number per 100 admissions [<1 vs 2.43 reported by Classen et al (1997) in a best evidence in this field of research]. Prescribing and dispensing steps remained a problem in the years probably to a lack of resources investment in IT. On the other side, reported ME near misses increased. In conclusion IRS had spread a safety culture among health personnel but it was not effectiveness in monitoring the real dimension of ADEs phenomenon
Una gestione più sicura del potassio: studio descrittivo in un ospedale ad alta specializzazione
No full textA chip removal facility for indium bump bonded pixel detectors
No full textYield maximization in multichip hybrid pixel sensors is a crucial issue in large volume productions planned for future High-Energy Physics experiments. Bump bonding process optimization can guarantee statistical single bump failure rates at the acceptable level of 10–100 ppm; nevertheless, systematic effects connected to process repeatability can affect the functionality of a full chip in a module to a much larger extent. Because of this, the reversibility of the bonding procedure has been investigated. A feasibility study on single chip assemblies for the ATLAS experiment has been successfully completed, proving the possibility of reworking. As a result of it, a dedicated facility has been conceptually designed, engineered and commissioned. The characteristics of the facility in terms of motion, temperature and tensile strength control are outlined, together with the main results
A chip removal facility for indium bump bonded pixel detectors
No full textYield maximization in multichip hybrid pixel sensors is a crucial issue in large volume productions planned for future High-Energy Physics experiments. Bump bonding process optimization can guarantee statistical single bump failure rates at the acceptable level of 10–100 ppm; nevertheless, systematic effects connected to process repeatability can affect the functionality of a full chip in a module to a much larger extent. Because of this, the reversibility of the bonding procedure has been investigated. A feasibility study on single chip assemblies for the ATLAS experiment has been successfully completed, proving the possibility of reworking. As a result of it, a dedicated facility has been conceptually designed, engineered and commissioned. The characteristics of the facility in terms of motion, temperature and tensile strength control are outlined, together with the main results
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