Encuesta a estudiantes en actividad en la Facultad de Ciencias Económicas - UNLP - noviembre 2004 - febrero 2005

En el transcurso del año 2004, la Prosecretaría de Evaluación Permanente puso a consideración de las autoridades de la Facultad la conveniencia de profundizar la realización de encuestas teniendo en cuenta en principio lo dispuesto por la Ley Nº 24.521 del 7 de julio de 1995, que establece entre otras cosas: - que las instituciones universitarias deberán asegurar el funcionamiento de instancias internas de evaluación institucional que tendrán por objeto analizar los logros y dificultades en el cumplimiento de sus funciones, así como sugerir medidas para su mejoramiento. - que las encuestas a alumnos y graduados son instrumentos de evaluación importantes para la realimentación del proceso de enseñanza y aprendizaje. Las autoridades, entendiendo las razones expresadas por esta Prosecretaría, resolvieron mediante Resolución Nº 677/04 autorizar la realización periódica de encuestas para los alumnos de las carreras de grado de esta Facultad. En cumplimiento de lo dispuesto y como resultado del trabajo realizado en conjunto con investigadores del Departamento de Economía, el 1 de noviembre del 2004, se inició - con carácter obligatorio- una encuesta a los estudiantes en actividad con el objetivo de recolectar datos relativos a la composición, características sociales, demográficas y académicas del conjunto de los estudiantes así como conocer la opinión de los alumnos con respecto a servicios que brinda la facultad. La encuesta permitía el acceso tanto alumnos que cursan en la sede de La Plata como así también a aquellos alumnos de los centros regionales. La misma estaba conformada por cinco formularios, los que trataban sobre: Datos del estudiante y su familia (Formulario 1), Datos laborales y otras actividades (Formulario 2), Educación Secundaria (Formulario 3), Educación universitaria (Formulario 4) y Servicios de biblioteca e informáticos brindados por la Facultad (Formulario 5). Una copia de los formularios empleados se incluye en el Apéndice. Los datos resultados de la encuesta, que se presentan a continuación, incluyen un conjunto de informaciones elaboradas a partir del procesamiento de las respuestas válidas efectuadas por 4104 estudiantes de esta Facultad. Este número de alumnos representa el 62 % del total de votos sufragados en las elecciones de Claustro Estudiantil correspondientes al año 2004 y que se efectuaron los primeros días del mes de Noviembre de ese año. La presentación se ha organizado en cinco partes ordenadas por la temática abordada en cada uno de los formularios. Para una mejor comprensión de los datos consignados cabe tener presente que la encuesta permitía responder sobre cada uno de los formularios por separado, razón por la cual algunos de los estudiantes eligieron no contestar alguno de ellos y por lo tanto el total de respuestas por formulario difiere.Facultad de Ciencias Económicas (FCE

Search for squarks and gluinos in events with isolated leptons, jets and missing transverse momentum at s√=8 TeV with the ATLAS detector

The results of a search for supersymmetry in final states containing at least one isolated lepton (electron or muon), jets and large missing transverse momentum with the ATLAS detector at the Large Hadron Collider are reported. The search is based on proton-proton collision data at a centre-of-mass energy s√=8 TeV collected in 2012, corresponding to an integrated luminosity of 20 fb−1. No significant excess above the Standard Model expectation is observed. Limits are set on supersymmetric particle masses for various supersymmetric models. Depending on the model, the search excludes gluino masses up to 1.32 TeV and squark masses up to 840 GeV. Limits are also set on the parameters of a minimal universal extra dimension model, excluding a compactification radius of 1/R c = 950 GeV for a cut-off scale times radius (ΛR c) of approximately 30

Evidence for the Higgs-boson Yukawa coupling to tau leptons with the ATLAS detector

Results of a search for H → τ τ decays are presented, based on the full set of proton-proton collision data recorded by the ATLAS experiment at the LHC during 2011 and 2012. The data correspond to integrated luminosities of 4.5 fb−1 and 20.3 fb−1 at centre-of-mass energies of √s = 7 TeV and √s = 8 TeV respectively. All combinations of leptonic (τ → `νν¯ with ` = e, µ) and hadronic (τ → hadrons ν) tau decays are considered. An excess of events over the expected background from other Standard Model processes is found with an observed (expected) significance of 4.5 (3.4) standard deviations. This excess provides evidence for the direct coupling of the recently discovered Higgs boson to fermions. The measured signal strength, normalised to the Standard Model expectation, of µ = 1.43 +0.43 −0.37 is consistent with the predicted Yukawa coupling strength in the Standard Model

Measurement of the top pair production cross section in 8 TeV proton-proton collisions using kinematic information in the lepton plus jets final state with ATLAS

A measurement is presented of the $t\bar{t}$ inclusive production cross-section in $pp$ collisions at a center-of-mass energy of $\sqrt{s}=8$ TeV using data collected by the ATLAS detector at the CERN Large Hadron Collider. The measurement was performed in the lepton+jets final state using a data set corresponding to an integrated luminosity of 20.3 fb$^{-1}$. The cross-section was obtained using a likelihood discriminant fit and $b$-jet identification was used to improve the signal-to-background ratio. The inclusive $t\bar{t}$ production cross-section was measured to be $260\pm 1{\textrm{(stat.)}} ^{+22}_{-23} {\textrm{(syst.)}}\pm 8{\textrm{(lumi.)}}\pm 4{\mathrm{(beam)}}$ pb assuming a top-quark mass of 172.5 GeV, in good agreement with the theoretical prediction of $253^{+13}_{-15}$ pb. The $t\bar{t}\to (e,\mu)+{\mathrm{jets}}$ production cross-section in the fiducial region determined by the detector acceptance is also reported.Comment: Published version, 19 pages plus author list (35 pages total), 3 figures, 2 tables, all figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-06

Measurement of the charge asymmetry in dileptonic Decays of top quark pairs in pp collisions at √ s = 7 TeV using the ATLAS detector

A measurement of the top-antitop (tt) charge asymmetry is presented using data corresponding to an integrated luminosity of 4.6 fb −1 of LHC pp collisions at a centre- of-mass energy of 7 TeV collected by the ATLAS detector. Events with two charged leptons, at least two jets and large missing transverse momentum are selected. Two observables are studied: A tt/C, based on the reconstructed tt final state. The asymmetries are measured to be A ll/C = 0.024 +/- 0.015 (stat.) +/- 0.009 (syst.) Att/C = 0.021 +/- 0.025 (stat.) +/- 0.017 (syst.) The measured values are in agreement with the Standard Model predictions

Razvoj i biofarmaceutsko vrednovanje pripravka za povećano oslobađanje tramadol hidroklorida na principu osmotske tehnologije

Extended release formulation of tramadol hydrochloride (TRH) based on osmotic technology was developed and evaluated. Target release profile was selected and different variables were optimized to achieve the same. Formulation variables like level of swellable polymer, plasticizer and the coat thickness of semipermeable membrane (SPM) were found to markedly affect the drug release. TRH release was directly proportional to the levels of plasticizer but inversely proportional to the levels of swellable polymer and coat thickness of SPM. Drug release from developed formulations was independent of pH and agitation intensity but dependent on osmotic pressure of the release media. In vivo study was also performed on six healthy human volunteers and various pharmacokinetic parameters (cmax, tmax, AUC0-24, MRT) and relative bioavailability were calculated. The in vitro and in vivo results were compared with performance of two commercial tablets of TRH. The developed formulation provided more prolonged and controlled TRH release as compared to marketed formulation. In vitro-in vivo correlation (IVIVC) was analyzed according to Wagner-Nelson method. The optimized formulation (batch IVB) exhibited good IVIV correlation (R = 0.9750). The manufacturing procedure was found to be reproducible and formulations were stable during 6 months of accelerated stability testing.U radu je opisana priprava i evaluacija pripravaka tramadol hidroklorida (TRH) na principu osmotske tehnologije. Da bi se postigao željeni profil oslobađanja mijenjane su različite varijable. Pokazalo se da najveći utjacaj na oslobađanje ljekovite tvari imaju udjeli polimera koji bubri, plastifikatora i debljina ovojnice polupropusne membrane (SPM). TRH oslobađanje bilo je proporcionalno udjelu plastifikatora, a obrnuto proporcionalno udjelu polimera i vrijednosti SPM. Oslobađanje ljekovite tvari bilo je neovisno o pH i intenzitetu miješanja, a ovisno o osmotskom talku medija. U in vivo studiji provedenoj na šest zdravih volontera određeni su farmakokinetički parametri (cmax, tmax, AUC0-24, MRT) i izračunata relativna bioraspoloživost. Rezultati dobiveni u pokusima in vitro i in vivo uspoređeni su s dvije vrste komercijalno dostupnih tableta TRH: oslobađanje ljekovite tvari iz pripravka razvijenog u ovom radu bilo je dulje i više kontrolirano. In vitro-in vivo korelacija (IVIVC) je analizirana prema Wagner-Nelsonovoj metodi. Optimizirani pripravak (IVB) pokazao je dobru IVIV korelaciju (R = 0,9750). Proizvodni proces je bio reproducibilan i pripravci su bili stabilni tijekom 6 mjeseci u uvjetima ubrzanog starenja

Search for pair-produced long-lived neutral particles decaying to jets in the ATLAS hadronic calorimeter in ppcollisions at √s=8TeV

The ATLAS detector at the Large Hadron Collider at CERN is used to search for the decay of a scalar boson to a pair of long-lived particles, neutral under the Standard Model gauge group, in 20.3fb−1of data collected in proton–proton collisions at √s=8TeV. This search is sensitive to long-lived particles that decay to Standard Model particles producing jets at the outer edge of the ATLAS electromagnetic calorimeter or inside the hadronic calorimeter. No significant excess of events is observed. Limits are reported on the product of the scalar boson production cross section times branching ratio into long-lived neutral particles as a function of the proper lifetime of the particles. Limits are reported for boson masses from 100 GeVto 900 GeV, and a long-lived neutral particle mass from 10 GeVto 150 GeV