Contrato psicológico en una muestra de trabajadores informales de la ciudad de Bogotá

Trabajo de investigaciónEl presente estudio se orientó a realizar una caracterización del contrato psicológico de una muestra de trabajadores informales en el Distrito Capital. Se contó con la participación de una muestra de 24 vendedores informales beneficiaros de los programas de concesión de espacio público del distrito. Se aplicó un diseño etnográfico con metodología cualitativa, utilizando entrevistas en profundidad, observación participante y registros fotográficos para la recolección de información. Se realizó un análisis de datos textuales bajo los principios de la teoría fundamentada, que permitió contrastar la realidad de los vendedores informales respecto al contrato psicológico percibido, coherente con los avances teóricos del constructo y las condiciones empíricas del trabajador informal. Los resultados permitieron identificar algunas categorías relacionadas con la formación, contenido y estabilidad del contrato psicológico y la apropiación del lugar como categoría emergente en esta población. También se propone una nueva tipología de contrato psicológico para los trabajadores informales como aporte al desarrollo del constructo.MaestríaMagister en Psicologí

Caracterización del contenido del contrato psicológico en un grupo de voluntarios de una organización sin ánimo de lucro en colombia

Las nuevas realidades laborales están caracterizadas por modelos flexibles de nexos laborales a través de los cuales las personas que pertenecen a una organización no se encuentran vinculadas necesariamente por contratos de trabajos formales, sino por un tipo de relacionamiento informal, lo que constituye una modalidad de trabajo en el mundo (Vélez, 2017). Existen variadas modalidades de trabajo, entendidas como “las diferentes formas como las personas se vinculan a las organizaciones en calidad de trabajadores” (Vesga, 2007, p. 82), que aún no han sido exploradas desde la mirada de los factores que pueden incidir en la relación laboral que se establece entre el individuo y la organización que lo recibe; es aquí cuando cobra sentido el concepto de contrato psicológico.1a edició

Geography determines genetic relationships between species of mountain pine (Pinus mugo complex) in western Europe

Aim  Our aims were to test whether morphological species of mountain pines were genetically supported in the western part of the distribution range of the Pinus mugo species complex (Pinus mugo Turra sensu lato), to resolve genetically homogeneous clusters of populations, to determine historical demographic processes, and to assess the potential hybridization of mountain pines with Scots pine, Pinus sylvestris L. Location  Populations were sampled in the Iberian System, the Pyrenees, the French Mont Ventoux, Vosges and Jura mountains, the German Black Forest and throughout the Alps. This corresponded to a range-wide sampling for mountain pine sensu stricto (Pinus uncinata Ram.) and to a sampling of the western parts of the ranges of dwarf mountain pine (Pinus mugo Turra sensu stricto) and bog pine/peatbog pine [Pinus rotundata Link/Pinus × pseudopumilio (Willk.) Beck]. Methods  In total, 786 individuals of P. mugo sensu lato from 29 natural populations, and 85 individuals of P. sylvestris from four natural populations were genotyped at three chloroplast microsatellites (cpSSRs). Populations were characterized for standard genetic diversity statistics and signs of demographic expansion. Genetic structure was explored using analysis of molecular variance, differentiation statistics and Bayesian analysis of population structure (BAPS). Results  One hundred haplotypes were identified in P. mugo sensu lato. There was a stronger differentiation between geographical regions than between morphologically identified taxa (P. mugo sensu stricto, P. uncinata and P. rotundata/P. ×pseudopumilio). Overall genetic differentiation was weak (GST = 0.070) and displayed a clear phylogeographic structure [NST = 0.263, NST > NST (permuted), P < 0.001]. BAPS identified a Pyrenean and an Alpine gene pool, along with several smaller genetic clusters corresponding to peripheral populations. Main conclusions  The core regions of the Pyrenees and Alps were probably recolonized, respectively by P. uncinata and P. uncinata/P. mugo sensu stricto, from multiple glacial refugia that were well connected by pollen flow within the mountain chains. Pinus rotundata/P. × pseudopumilio populations from the Black Forest, Vosges and Jura mountains were probably recolonized from various glacial populations that kept their genetic distinctiveness despite late glacial and early Holocene expansion. Marginal P. uncinata populations from the Iberian System are compatible with elevational shifts and long-term isolation. The causes of haplotype sharing between P. mugo sensu lato and P. sylvestris require further researc

Animales en la poesía : una selección

RESUMEN : La presente es una antología de poemas sobre animales que hemos decidido llamar así, simplemente, Animales en la poesía, distinto al título de Bestiario, que contemplamos inicialmente, debido a cierta generalización que, bajo ese nombre, se reúne animales de toda índole, incluso aquellos pequeños animales que poco prefiguran un bestiario. Esta designación, justamente, designaría una reunión de bestias y estas están definidas, genéricamente, como animales de cuatro patas; entonces ello desmentiría o se prestaría para equívocos...CONTENIDO : Animales en la poesía. -- Kuyata. -- Poema con caballos rojos. -- Un cruce. -- Insectos en la misa. -- Gato casero. -- El gallinazo gira sobre los árboles. -- La serpiente que danza. -- El dragón azulado. -- A un perro. -- Ciervo. -- Cervatillo. -- Avechucho. -- Necoclí. -- Pez muerto. -- En el bosque, al lado del mar. -- Sobre las colinas. -- La perrita coja. -- El loro. -- Giran, giran. -- Pájaros. -- Cangrejos en el Morrosquillo. -- Garcilla bueyera. -- El burro. -- El gatopájaro. -- Bestia mía. -- Habla la vaca (fragmento). -- Un pueblo de amos... -- La mosca. -- Una avispa sobre el agua. -- Hormiga y faraona. -- Tulipanes rojos. -- La mariposa. -- El armadillo. -- Olvidadas ya la libertad y la floresta. -- Verdor. -- Reciclando. -- Milacos. -- Respuesta al párroco. -- La más pequeña abeja. -- El cóndor. -- La canción de los osos. -- Espíritu de pájaro. -- Aves de mar. -- La sirena. -- Un mono

Measurement of the top quark forward-backward production asymmetry and the anomalous chromoelectric and chromomagnetic moments in pp collisions at √s = 13 TeV

Abstract The parton-level top quark (t) forward-backward asymmetry and the anomalous chromoelectric (d̂ t) and chromomagnetic (μ̂ t) moments have been measured using LHC pp collisions at a center-of-mass energy of 13 TeV, collected in the CMS detector in a data sample corresponding to an integrated luminosity of 35.9 fb−1. The linearized variable AFB(1) is used to approximate the asymmetry. Candidate t t ¯ events decaying to a muon or electron and jets in final states with low and high Lorentz boosts are selected and reconstructed using a fit of the kinematic distributions of the decay products to those expected for t t ¯ final states. The values found for the parameters are AFB(1)=0.048−0.087+0.095(stat)−0.029+0.020(syst),μ̂t=−0.024−0.009+0.013(stat)−0.011+0.016(syst), and a limit is placed on the magnitude of | d̂ t| &lt; 0.03 at 95% confidence level. [Figure not available: see fulltext.

Measurement of b jet shapes in proton-proton collisions at root s=5.02 TeV

We present the first study of charged-hadron production associated with jets originating from b quarks in proton-proton collisions at a center-of-mass energy of 5.02 TeV. The data sample used in this study was collected with the CMS detector at the CERN LHC and corresponds to an integrated luminosity of 27.4 pb(-1). To characterize the jet substructure, the differential jet shapes, defined as the normalized transverse momentum distribution of charged hadrons as a function of angular distance from the jet axis, are measured for b jets. In addition to the jet shapes, the per-jet yields of charged particles associated with b jets are also quantified, again as a function of the angular distance with respect to the jet axis. Extracted jet shape and particle yield distributions for b jets are compared with results for inclusive jets, as well as with the predictions from the pythia and herwig++ event generators.Peer reviewe

Measurement of the azimuthal anisotropy of Y(1S) and Y(2S) mesons in PbPb collisions at root s(NN)=5.02 TeV

The second-order Fourier coefficients (v(2)) characterizing the azimuthal distributions of Y(1S) and Y(2S) mesons produced in PbPb collisions at root s(NN) = 5.02 TeV are studied. The Y mesons are reconstructed in their dimuon decay channel, as measured by the CMS detector. The collected data set corresponds to an integrated luminosity of 1.7 nb(-1). The scalar product method is used to extract the v2 coefficients of the azimuthal distributions. Results are reported for the rapidity range vertical bar y vertical bar < 2.4, in the transverse momentum interval 0 < pT < 50 GeV/c, and in three centrality ranges of 10-30%, 30-50% and 50-90%. In contrast to the J/psi mesons, the measured v(2) values for the Y mesons are found to be consistent with zero. (C) 2021 The Author(s). Published by Elsevier B.V.Peer reviewe

Search for Physics beyond the Standard Model in Events with Overlapping Photons and Jets

Results are reported from a search for new particles that decay into a photon and two gluons, in events with jets. Novel jet substructure techniques are developed that allow photons to be identified in an environment densely populated with hadrons. The analyzed proton-proton collision data were collected by the CMS experiment at the LHC, in 2016 at root s = 13 TeV, and correspond to an integrated luminosity of 35.9 fb(-1). The spectra of total transverse hadronic energy of candidate events are examined for deviations from the standard model predictions. No statistically significant excess is observed over the expected background. The first cross section limits on new physics processes resulting in such events are set. The results are interpreted as upper limits on the rate of gluino pair production, utilizing a simplified stealth supersymmetry model. The excluded gluino masses extend up to 1.7 TeV, for a neutralino mass of 200 GeV and exceed previous mass constraints set by analyses targeting events with isolated photons.Peer reviewe

Measurement of the Jet Mass Distribution and Top Quark Mass in Hadronic Decays of Boosted Top Quarks in pp Collisions at root s=13 TeV

A measurement is reported of the jet mass distribution in hadronic decays of boosted top quarks produced in pp collisions at root s = 13 TeV. The data were collected with the CMS detector at the LHC and correspond to an integrated luminosity of 35.9 fb(-1). The measurement is performed in the lepton + jets channel of t (t) over bar events, where the lepton is an electron or muon. The products of the hadronic top quark decay t -> bW -> bq (q) over bar' are reconstructed as a single jet with transverse momentum larger than 400 GeV. The t (t) over bar cross section as a function of the jet mass is unfolded at the particle level and used to extract a value of the top quark mass of 172.6 +/- 2.5 GeV. A novel jet reconstruction technique is used for the first time at the LHC, which improves the precision by a factor of 3 relative to an earlier measurement. This highlights the potential of measurements using boosted top quarks, where the new technique will enable future precision measurements.Peer reviewe

Calibration of the CMS hadron calorimeters using proton-proton collision data at root s=13 TeV

Methods are presented for calibrating the hadron calorimeter system of theCMSetector at the LHC. The hadron calorimeters of the CMS experiment are sampling calorimeters of brass and scintillator, and are in the form of one central detector and two endcaps. These calorimeters cover pseudorapidities vertical bar eta vertical bar ee data. The energy scale of the outer calorimeters has been determined with test beam data and is confirmed through data with high transverse momentum jets. In this paper, we present the details of the calibration methods and accuracy.Peer reviewe