Rapidity gaps in gluon jets / color reconnection at LEP

Gluon jets with a large gap in the rapidity distribution of particles within the jet are very sensitive to color reconnection effects. Gluon jets of this type, selected from hadronic Z0 decay events produced in e+e- annihilations at LEP, are used to test three QCD models which include a simulation of color reconnection: one in the Ariadne Monte Carlo, one in the Herwig Monte Carlo, and the other by Rathsman in the Pythia Monte Carlo. We conclude that color reconnection as implemented by the Rathsman and Ariadne models is disfavored. We don't obtain a definite conclusion concerning the Herwig color reconnection model.Comment: 4 pages, 2 figure

Recent QCD results from OPAL

Some recent QCD results from the OPAL Collaboration are summarized. In particular: a test of color reconnection models and a search for glueballs using gluon jets with a rapidity gap; a study of unbiased gluon jet properties using a new technique called jet boost algorithm; a measurement of the strong coupling constant from radiative events.Comment: 5 pages, 2 figures. Invited talk at the XIIth International Workshop on Deep-Inelastic Scattering DIS2004, 14-18 April 2004, Strbske Pleso, Slovakia; OPAL-CR52

Study of hadronic final states at LEP

Recent analyses, performed using multihadronic Z 0 decays collected with the OPAL detector between 1991 and 2000 at the Large Electron Positron (LEP) collider, are presented. The first one is a study of correlations of particles with restricted momenta, indicating some difficulties with the Local Parton-Hadron Duality (LPHD) hypothesis when applied to many-particle inclusive observables of soft hadrons. In the second analysis, unbiased gluon jet properties are studied using a new technique called jet boost algorithm

Offline Calibration Procedure of the Drift Tube Detectors

A detailed description of the calibration of the DT local reconstruction algorithm is reported. After inter-channel synchronization has been verified through the appropriate hardware procedure, the time pedestal can be extracted directly from the distribution of the digi-times. Further corrections for time-of-flight and time of signal propagation are applied as soon as the three-dimensional hit position within the chamber is known. The different effects of the time pedestal miscalibration on the two main hit reconstruction algorithms are shown. The drift velocity calibration algorithm is based on the meantimer technique and different meantimer relations for different track angles and patterns of hit cells are used. This algorithm can also be used to determine the uncertainty of the reconstructed hit position

Resuscitative thoracotomy for non-traumatic tension viscerothorax

A case of acute herniation of small bowel in thorax after blunt trauma is described, emphasizing the necessity ao a resuscitation emergency thoracotom

PAVIMENTAZIONI STRADALI: ANALISI DI CICLO DI VITA E SOSTENIBILITÀ ENERGETICO-AMBIENTALE

Based on the 2030 Agenda for Sustainable Development (25th September 2015), transport systems have to be 1) Sustainable. 2) Quality and resilient. 3) Safe. To this end, note that the Italian Ministry of Research funded the Research Project PRIN USR342 that involves related ideas and focuses on 3 paving solutions (made with recycled materials and sustainable technologies), 4 sets of modules (software), and 2 platforms. The objective of the study here presented deals with the assessment of the best pavement technology based on energy and environmental performance. Consequently, a life cycle assessment, LCA, was applied, considering material production, construction, maintenance, and end of life. The environmental impact of the different pavement technologies was derived. Results demonstrate that the use of warm mix asphalts and of recycled asphalt pavement (RAP) yields the lowest energy consumption and environ-mental impact. Furthermore, under the hypotheses of the study, the production of mixtures is crucial because it corresponds to a contribution of about 60-70% in the life cycle of the different materials. LCA approach confirms as a methodology able to help decision makers when strategies and actions for the eco-design of road pavements are needed

Mortalidad y recurrencia de la enfermedad tromboembólica venosa en pacientes adultos: cohorte prospectiva

INTRODUCCIÓN: La enfermedad tromboembólica venosa (ETV) es una patología que aumenta con la edad. Objetivo: comparar la sobrevida de los ancianos y los jóvenes con un primer episodio de ETV aguda y sintomática. MATERIALES Y MÉTODOS: Cohorte prospectiva de casos incidentes de ETV incluidos en el Registro Institucional de Enfermedad Tromboembólica venosa (NCT01372514) del Hospital Italiano de Buenos Aires entre 2012-2014, dividido en grupos jóvenes (17-64 años) y ancianos (≥ 65 años). Todos los pacientes fueron seguidos anualmente para evaluar el tiempo a la recurrencia (progresión o nuevo evento sintomático de ETV) como eventos competitivos en contexto de muerte y sangrado mayor. Se presentaron los riesgos crudos (c) y ajustados (a). RESULTADOS: se incluyeron 446 pacientes, el 63% (292) fueron mayores de 65 años. La sobrevida fue menor en los ancianos comparados con los jóvenes (p 0.007), a los 3 meses 87% vs 95% y al año 73% vs 87%, respectivamente. Los ancianos presentaron un HRc1,71 y HR a 1.68. La recurrencia global fue 5% (IC 95% 3-8) al mes, 6% (IC 95% 4-9) a los 3 meses, 8% (IC 95% 6-11) al año y 13% (IC 95% 9-18) a los dos años. No se encontró asociación entre la edad y la recurrencia sub hazard 0.8(IC 0,34-1,86). El sangrado ocurrió en un 9% (39) de los pacientes. CONCLUSIONES: La mortalidad global en pacientes con ETV confirmada es mayor en la población anciana. No hubo diferencias en relación a la recurrencia de ETV, ni el sangrado y tampoco con la edad.INTRODUCTION: Venous thromboembolic disease (VTE) is a pathology that increases with age. OBJECTIVE: to compare the survival of the elderly and the young with a first episode of acute and symptomatic VTE. MATERIALS AND METHODS: Prospective cohort of incident VTE cases included in the Institutional Registry of Venous Thromboembolic Disease (NCT01372514) of the Italian Hospital of Buenos Aires between 2012-2014, divided into young groups (17-64 years old) and elderly (65 years old). All the patients were followed annually to assess the time to recurrence (progression or new symptomatic event of VTE) as competitive events in the context of death and major bleeding. Raw (c) and adjusted (a) risks were presented. RESULTS: 446 patients were included, 63% (292) were older than 65 years. Survival was lower in the elderly compared to the young (p 0.007), at 3 months 87% vs. 95% and at one year 73% vs. 87%, respectively. The elderly had a HRc1.71 and HR at 1.68. The overall recurrence was 5% (95% CI 3-8) at one month, 6% (95% CI 4-9) at 3 months, 8% (95% CI). 6-11) at one year and 13% (95% CI 9-18) at two years. No association was found between age and recurrence sub hazard 0.8 (CI 0.34- 1.86). Bleeding occurred in 9% (39) of the patients. CONCLUSIONS: The overall mortality in patients with confirmed VTE is higher in the elderly population. There were no differences in relation to the recurrence of VTE, or bleeding, and neither with age.INTRODUÇÃO: A doença tromboembólica venosa (TEV) é uma patologia que aumenta com a idade. OBJETIVO: comparar a sobrevida de idosos e jovens com um primeiro episódio de TEV agudo e sintomático. MATERIAIS E MÉTODOS:Coorte prospectiva de casos de TEV incidentes incluídos no Registro Institucional de Doença Tromboembólica Venosa (NCT01372514) do Hospital Italiano de Buenos Aires entre 2012-2014, divididos em grupos jovens (17 a 64 anos) e idosos (65 anos) velho). Todos os pacientes foram acompanhados anualmente para avaliar o tempo de recorrência (progressão ou novo evento sintomático de TEV) como eventos competitivos no contexto de morte e sangramento grave. Os riscos brutos (c) e ajustados (a) foram apresentados. RESULTADOS:446 pacientes foram incluídos, 63% (292) tinham idade superior a 65 anos. A sobrevida foi menor nos idosos em comparação aos jovens (p 0,007), aos 3 meses 87% vs. 95% e aos um ano 73% vs. 87%, respectivamente. Os idosos apresentaram HRc1.71 e FC em 1,68. A recorrência geral foi de 5% (IC95% 3-8) em um mês, 6% (IC95% 4-9) em 3 meses, 8% (IC95%). 6-11) em um ano e 13% (IC95% 9-18) em dois anos. Não foi encontrada associação entre idade e recorrência sub-risco 0,8 (IC 0,34-1,86). Ocorreu sangramento em 9% (39) dos pacientes. CONCLUSÕES: A mortalidade geral em pacientes com TEV confirmado é maior na população idosa. Não houve diferenças em relação à recorrência de TEV ou sangramento e nem com a idade.Fil: Posadas Martinez, Maria Lourdes. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Pagotto, Vanina Laura. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; ArgentinaFil: Grande Ratti, Maria Florencvia. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; ArgentinaFil: Alfie, Veronica. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; ArgentinaFil: Andresik, Diego. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; ArgentinaFil: Torres Gomez, Felipe. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; ArgentinaFil: Giunta, Diego Hernan. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Luxardo, Rosario. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; ArgentinaFil: Scolnik, Marina. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; ArgentinaFil: Vazquez, Fernando Javier. Hospital Italiano. Departamento de Medicina. Servicio de Clínica Médica; Argentin

Colour reconnection in e+e- -> W+W- at sqrt(s) = 189 - 209 GeV

The effects of the final state interaction phenomenon known as colour reconnection are investigated at centre-of-mass energies in the range sqrt(s) ~ 189-209 GeV using the OPAL detector at LEP. Colour reconnection is expected to affect observables based on charged particles in hadronic decays of W+W-. Measurements of inclusive charged particle multiplicities, and of their angular distribution with respect to the four jet axes of the events, are used to test models of colour reconnection. The data are found to exclude extreme scenarios of the Sjostrand-Khoze Type I (SK-I) model and are compatible with other models, both with and without colour reconnection effects. In the context of the SK-I model, the best agreement with data is obtained for a reconnection probability of 37%. Assuming no colour reconnection, the charged particle multiplicity in hadronically decaying W bosons is measured to be (nqqch) = 19.38+-0.05(stat.)+-0.08 (syst.).Comment: 30 pages, 9 figures, Submitted to Euro. Phys. J.

Search for R-Parity Violating Decays of Scalar Fermions at LEP

A search for pair-produced scalar fermions under the assumption that R-parity is not conserved has been performed using data collected with the OPAL detector at LEP. The data samples analysed correspond to an integrated luminosity of about 610 pb-1 collected at centre-of-mass energies of sqrt(s) 189-209 GeV. An important consequence of R-parity violation is that the lightest supersymmetric particle is expected to be unstable. Searches of R-parity violating decays of charged sleptons, sneutrinos and squarks have been performed under the assumptions that the lightest supersymmetric particle decays promptly and that only one of the R-parity violating couplings is dominant for each of the decay modes considered. Such processes would yield final states consisting of leptons, jets, or both with or without missing energy. No significant single-like excess of events has been observed with respect to the Standard Model expectations. Limits on the production cross- section of scalar fermions in R-parity violating scenarios are obtained. Constraints on the supersymmetric particle masses are also presented in an R-parity violating framework analogous to the Constrained Minimal Supersymmetric Standard Model.Comment: 51 pages, 24 figures, Submitted to Eur. Phys. J.

Metabolic shift underlies recovery in reversible infantile respiratory chain deficiency

Reversible infantile respiratory chain deficiency (RIRCD) is a rare mitochondrial myopathy leading to severe metabolic disturbances in infants, which recover spontaneously after 6-months of age. RIRCD is associated with the homoplasmic m.14674T>C mitochondrial DNA mutation; however, only ~ 1/100 carriers develop the disease. We studied 27 affected and 15 unaffected individuals from 19 families and found additional heterozygous mutations in nuclear genes interacting with mt-tRNAGlu including EARS2 and TRMU in the majority of affected individuals, but not in healthy carriers of m.14674T>C, supporting a digenic inheritance. Our transcriptomic and proteomic analysis of patient muscle suggests a stepwise mechanism where first, the integrated stress response associated with increased FGF21 and GDF15 expression enhances the metabolism modulated by serine biosynthesis, one carbon metabolism, TCA lipid oxidation and amino acid availability, while in the second step mTOR activation leads to increased mitochondrial biogenesis. Our data suggest that the spontaneous recovery in infants with digenic mutations may be modulated by the above described changes. Similar mechanisms may explain the variable penetrance and tissue specificity of other mtDNA mutations and highlight the potential role of amino acids in improving mitochondrial disease