742 research outputs found

    Cultura e bem estar no trabalho: o papel do ajustamento pessoa-organização num estudo experimental

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    Com a crescente importância da vida laboral torna-se necessário o estudo de variáveis que aprimorem o trabalho individual e das empresas. Adotando um design experimental, com a manipulação de quatro orientações culturais e com uma amostra de 150 trabalhadores de uma empresa multinacional, este estudo foi realizado com o objetivo de avaliar o impacto da cultura organizacional no bem-estar (afetivo e cognitivo) laboral, o impacto do ajustamento pessoa-organização no bem-estar do trabalhador e a forma como a relação entre a cultura organizacional e o bem-estar é moderada pelo ajustamento pessoa-organização. Os resultados revelaram que quanto mais elevados os níveis de ajustamento pessoa-organização, maior o conforto, entusiasmo, bem-estar geral e satisfação. Quanto à cultura organizacional, embora não se tenham verificado efeitos de interação significativos, as culturas de apoio e inovação revelam níveis superiores de conforto, entusiasmo, bem-estar afetivo geral, e satisfação laboral dos indivíduos, ao contrário das culturas de regras e objetivos; Culture and Well-Being at Work: the role of person - organization fit in an experimental study Abstract: With the growing importance of working life it is necessary to study the variables to improve individual work and business. Adopting an experimental design, handling four cultural orientations and a sample of 150 employees of a multinational company, this study was designed in order to explore the impact of organizational culture on well-being (affective and cognitive) labor, the impact of person-organization fit in the worker's well-being and how the relationship between organizational culture and well-being is moderated by person-organization fit. The results revealed that the higher the adjustment levels of person-organization, the greater comfort, enthusiasm, general well-being and satisfaction will be. As for the organizational culture, although there were not verified significant interaction effects, cultures of support and innovation promote comfort, enthusiasm, general emotional well-being and job satisfaction of individuals, unlike the cultures of rules and objectives

    Decomposição da cross-sectional volatility no mercado de ações português

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    JEL Classification: G11; G19Com as recentes crises no sector financeiro, tem-se notado um aumento da importância atribuída à estimação de métricas que permitam a avaliação do risco associado a cada investimento. A volatilidade é reconhecida como uma medida de dispersão das taxas de rendibilidades, de um ou mais ativos, por um determinado período de tempo. Existem essencialmente duas metodologias de análise da volatilidade, através de Time-Series Volatility e de Cross-Sectional Volatility. Este trabalho propõe-se a realizar a decomposição da Cross-Sectional Volatility para o mercado acionista português. Esta decomposição é realizada, tendo como inspiração, a metodologia descrita em Menchero e Morozov (2010). Para a realização deste estudo foram consideradas duas categorias de fatores explicativos, a primeira composta por fatores que traduzem Estilos de Investimento comummente designados por Styles e a segunda pelos Supersectors de Atividade. A presente Dissertação aponta à concretização de dois objetivos: o primeiro prende-se com o estudo da aderência do modelo ao mercado acionista português e o segundo com a identificação dos principais drivers da volatilidade, possibilitando a perceção da sua amplitude e relevância.With the recent crisis in the financial sector, has been noticed an increasing level of importance in metrics estimation aiming to manage risk within each investment. The volatility is recognized as a measure of yield’s dispersion for one or more assets for a given period of time. There are essentially two methodologies for volatility calculation making use of Time-Series Volatility and Cross-Sectional Volatility. This paper proposes to perform the decomposition of Cross-Sectional Volatility for the Portuguese equity market. This decomposition is performed, taking as inspiration, the methodology described in Menchero and Morozov (2010). There were considered two categories of explanatory factors, the first composed by factors commonly called Styles and the second by Supersectors of Activity. This Master Thesis aims at achieve two main objectives: the first is related to the model adherence to Portuguese equity market and the second is to identify the main drivers of volatility, enabling their scales and relevance study

    Stellar jitter from variable gravitational redshift: implications for RV confirmation of habitable exoplanets

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    A variation of gravitational redshift, arising from stellar radius fluctuations, will introduce astrophysical noise into radial velocity measurements by shifting the centroid of the observed spectral lines. Shifting the centroid does not necessarily introduce line asymmetries. This is fundamentally different from other types of stellar jitter so far identified, which do result from line asymmetries. Furthermore, only a very small change in stellar radius, ~0.01%, is necessary to generate a gravitational redshift variation large enough to mask or mimic an Earth-twin. We explore possible mechanisms for stellar radius fluctuations in low-mass stars. Convective inhibition due to varying magnetic field strengths and the Wilson depression of starspots are both found to induce substantial gravitational redshift variations. Finally, we investigate a possible method for monitoring/correcting this newly identified potential source of jitter and comment on its impact for future exoplanet searches.Comment: 6 pages, 1 figure, 1 tabl

    Measurement of the cosmic ray spectrum above 4×10184{\times}10^{18} eV using inclined events detected with the Pierre Auger Observatory

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    A measurement of the cosmic-ray spectrum for energies exceeding 4×10184{\times}10^{18} eV is presented, which is based on the analysis of showers with zenith angles greater than 6060^{\circ} detected with the Pierre Auger Observatory between 1 January 2004 and 31 December 2013. The measured spectrum confirms a flux suppression at the highest energies. Above 5.3×10185.3{\times}10^{18} eV, the "ankle", the flux can be described by a power law EγE^{-\gamma} with index γ=2.70±0.02(stat)±0.1(sys)\gamma=2.70 \pm 0.02 \,\text{(stat)} \pm 0.1\,\text{(sys)} followed by a smooth suppression region. For the energy (EsE_\text{s}) at which the spectral flux has fallen to one-half of its extrapolated value in the absence of suppression, we find Es=(5.12±0.25(stat)1.2+1.0(sys))×1019E_\text{s}=(5.12\pm0.25\,\text{(stat)}^{+1.0}_{-1.2}\,\text{(sys)}){\times}10^{19} eV.Comment: Replaced with published version. Added journal reference and DO

    Energy Estimation of Cosmic Rays with the Engineering Radio Array of the Pierre Auger Observatory

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    The Auger Engineering Radio Array (AERA) is part of the Pierre Auger Observatory and is used to detect the radio emission of cosmic-ray air showers. These observations are compared to the data of the surface detector stations of the Observatory, which provide well-calibrated information on the cosmic-ray energies and arrival directions. The response of the radio stations in the 30 to 80 MHz regime has been thoroughly calibrated to enable the reconstruction of the incoming electric field. For the latter, the energy deposit per area is determined from the radio pulses at each observer position and is interpolated using a two-dimensional function that takes into account signal asymmetries due to interference between the geomagnetic and charge-excess emission components. The spatial integral over the signal distribution gives a direct measurement of the energy transferred from the primary cosmic ray into radio emission in the AERA frequency range. We measure 15.8 MeV of radiation energy for a 1 EeV air shower arriving perpendicularly to the geomagnetic field. This radiation energy -- corrected for geometrical effects -- is used as a cosmic-ray energy estimator. Performing an absolute energy calibration against the surface-detector information, we observe that this radio-energy estimator scales quadratically with the cosmic-ray energy as expected for coherent emission. We find an energy resolution of the radio reconstruction of 22% for the data set and 17% for a high-quality subset containing only events with at least five radio stations with signal.Comment: Replaced with published version. Added journal reference and DO

    Measurement of the Radiation Energy in the Radio Signal of Extensive Air Showers as a Universal Estimator of Cosmic-Ray Energy

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    We measure the energy emitted by extensive air showers in the form of radio emission in the frequency range from 30 to 80 MHz. Exploiting the accurate energy scale of the Pierre Auger Observatory, we obtain a radiation energy of 15.8 \pm 0.7 (stat) \pm 6.7 (sys) MeV for cosmic rays with an energy of 1 EeV arriving perpendicularly to a geomagnetic field of 0.24 G, scaling quadratically with the cosmic-ray energy. A comparison with predictions from state-of-the-art first-principle calculations shows agreement with our measurement. The radiation energy provides direct access to the calorimetric energy in the electromagnetic cascade of extensive air showers. Comparison with our result thus allows the direct calibration of any cosmic-ray radio detector against the well-established energy scale of the Pierre Auger Observatory.Comment: Replaced with published version. Added journal reference and DOI. Supplemental material in the ancillary file

    La inserción de los graduados 2011 y 2012 de la Universidad Nacional de La Matanza en el mercado laboral

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    La presente investigación es llevada a cabo por el Departamento de Ciencias de Económicas en conjunto con la Dirección de Graduados dependiente de la Secretaria de Extensión Universitaria de la Universidad Nacional de La Matanza. Este proyecto indaga acerca del vínculo graduado-inserción laboral de los graduados de la Universidad Nacional de La Matanza en relación a su titulación académica; y pretende ofrecer a la Institución un diagnóstico acerca del panorama laboral del graduado 2011 y 2012 de la Universidad. El fin de este trabajo es profundizar el proceso de seguimiento de los graduados en relación a la esfera laboral, dichos resultados junto a investigaciones futuras podrán influir en el diseño de políticas educativas institucionales orientados a la mejora continua. La realidad actual invita a ahondar a través de técnicas de investigación que permitan entender el dinamismo de los fenómenos que tienen lugar en la sociedad. A partir de una combinación de herramientas cuantitativas y cualitativas de recolección de información se pretende construir nuevo conocimiento que aporte a la mejora en la calidad educativa universitaria. Entre los instrumentos utilizados se pueden mencionar el análisis de base de datos, el relevamiento bibliográfico, la realización de encuestas y entrevistas, entre otras. En una primera instancia, se trabaja con técnicas que permiten conocer datos estructurados acerca de la situación laboral de los graduados, a través de encuestas, relevamiento y análisis de documentación estadística. En una segunda instancia, se orienta a profundizar la realidad existente que se pretende abordar, a través de un enfoque fenomenológico complementario, el cual intenta interpretar tanto el detalle de las vidas individuales como de los contextos sociales, políticos, y otros que sean pertinentes. Este proceso de investigación encausa la comprensión empática del fenómeno objeto de estudio y, si bien profundiza en las particularidades de cada sujeto, pone principal interés en su desempeño profesional y en su vínculo con el entorno laboral. De esta manera, se puede afirmar que la inserción laboral resulta un proceso complejo en el cual interviene no sólo la formación académica recibida sino variables sociales, económicas, entre otras. Por este motivo, resulta de vital importancia el acompañamiento que los graduados reciben de las instituciones que los forman, no sólo para brindarles una oferta de especialización académica vinculada a sus áreas de formación sino para guiarlos en el proceso y contenerlos en su inserción al mercado laboral. Como producto del trabajo de intervención originado por dicha investigación se ha diseñado y puesto en funcionamiento el Programa de Inclusión Laboral de Graduados de la Universidad Nacional de La Matanza. A través de este Proyecto, y sumado a la información relevada en esta investigación, se pretende conocer la realidad actual y, en función a ello, diseñar políticas educativas institucionales que acompañen y favorezcan la inserción laboral.Fil: Martínez, Julio Alejandro Nicolás. Universidad Nacional de La Matanza; Argentina.Fil: Otegui, Cristina. Universidad Nacional de La Matanza; Argentina.Fil: Mouta, Silvina Raquel. Universidad Nacional de La Matanza; Argentina.Fil: Faraldi, Ricardo. Universidad Nacional de La Matanza; Argentina.Fil: Galanti, Melody Nayla. Universidad Nacional de La Matanza; Argentina.Fil: Schifrin, Antonella. Universidad Nacional de La Matanza; Argentina.Fil: Varvuzza, Mailén Sofia Elisa. Universidad Nacional de La Matanza; Argentina.Fil: Feré, Maribel. Universidad Nacional de La Matanza; Argentina.Fil: Martínez, Nicolás. Universidad Nacional de La Matanza; Argentina.Fil: Rodríguez, Néstor Ariel. Universidad Nacional de La Matanza; Argentina.Fil: Pepe, María Laura. Universidad Nacional de La Matanza; Argentina.Fil: Santoriello, Hernán Carlos Marcelo. Universidad Nacional de La Matanza; Argentina.Fil: Marcos, Mariel Verónica. Universidad Nacional de La Matanza; Argentina.Fil: Lamas, Marcelo Oscar. Universidad Nacional de La Matanza; Argentina.Fil: Ibañez, Rosana Beatriz. Universidad Nacional de La Matanza; Argentina.Fil: Almaraz, Lorena Paola. Universidad Nacional de La Matanza; Argentina.Fil: Mansour, Jorge Alejandro. Universidad Nacional de La Matanza; Argentina.Fil: Santos, Edgard. Universidad Nacional de La Matanza; Argentina.Fil: Iribarne, Alba Esther. Universidad Nacional de La Matanza; Argentina.Fil: Turczak, Pedro. Universidad Nacional de La Matanza; Argentina

    Lactato como preditor de gravidade no paciente crítico

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    Objetivo: investigar a literatura acerca do papel do lactato sanguíneo como marcador prognóstico de mortalidade em pacientes graves. Método: A busca dos estudos foi realizada nas plataformas de busca LILACS e Pubmed. Foram utilizadas as palavras-chave “lactato”, “paciente grave”, “mortalidade” e “prognóstico”. As palavras-chaves foram ainda traduzidas para o idioma inglês da seguinte forma: “lactate”, “critical patient”, “mortality” and “prognosis”. Todas as palavras-chave estão registradas nos Descritores em Ciências da Saúde (DeCs) e Medical Subject Headings (MeSh). Discussão: Em indivíduos saudáveis, a produção e a metabolização do lactato ocorrem de forma continua em tecidos cerebrais, estomacais, no músculo esquelético e em eritrócitos. Os pacientes com hiperlactatemia persistente (>2mmol/L) por um período ≥72 horas apresentaram maior mortalidade em 90 dias quando comparados aos pacientes com lactato ≤2,0 mmol/L e, valores médios de lactato ponderado pelo tempo foram maiores em não sobreviventes. Considerações finais: O manejo de pacientes graves orientados pelo lactato é considerado como um método que pode ser capaz de promover a redução da mortalidade. A hiperlactatemia esteve associada à maiores taxas de mortalidade em pacientes gravemente enfermos, especialmente quando acima ou iguais a 5mmol/L no momento da admissão. Dessa forma, o lactato é um preditor considerado confiável e que prediz a gravidade da doença e a falência de múltiplos órgãos

    MedShapeNet -- A Large-Scale Dataset of 3D Medical Shapes for Computer Vision

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    Prior to the deep learning era, shape was commonly used to describe the objects. Nowadays, state-of-the-art (SOTA) algorithms in medical imaging are predominantly diverging from computer vision, where voxel grids, meshes, point clouds, and implicit surface models are used. This is seen from numerous shape-related publications in premier vision conferences as well as the growing popularity of ShapeNet (about 51,300 models) and Princeton ModelNet (127,915 models). For the medical domain, we present a large collection of anatomical shapes (e.g., bones, organs, vessels) and 3D models of surgical instrument, called MedShapeNet, created to facilitate the translation of data-driven vision algorithms to medical applications and to adapt SOTA vision algorithms to medical problems. As a unique feature, we directly model the majority of shapes on the imaging data of real patients. As of today, MedShapeNet includes 23 dataset with more than 100,000 shapes that are paired with annotations (ground truth). Our data is freely accessible via a web interface and a Python application programming interface (API) and can be used for discriminative, reconstructive, and variational benchmarks as well as various applications in virtual, augmented, or mixed reality, and 3D printing. Exemplary, we present use cases in the fields of classification of brain tumors, facial and skull reconstructions, multi-class anatomy completion, education, and 3D printing. In future, we will extend the data and improve the interfaces. The project pages are: https://medshapenet.ikim.nrw/ and https://github.com/Jianningli/medshapenet-feedbackComment: 16 page
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