Analysis of Some Power Quality Parameters at the Points of Common Coupling of Photovoltaic Plants Based on Data Measured by Inverters

With the increasing implementation of renewable energies, the impact that this type of installation can have on the electricity supply grid is of great importance. In this context, the aim of this work is to analyse how the production and injection of electricity generated by a series of small photovoltaic (PV) installations influence some parameters of the electricity grid in the low-voltage (LV) distribution networks to which they are connected, by analysing the basic data provided by the inverters of these installations. The presence of a slight rise in the grid voltage values in the Point of Common Coupling (PCC) as the production of the PV plants increases has been verified, with maximum slopes between 0.95 and 0.00027 V/kW, but which do not result in voltage values close to the limits set by the regulations. In addition to assessing this impact, the results obtained made it possible to determine the hosting capacity that the networks into which these installations inject their energy would have for this type of installation so as not to have a detrimental effect on the voltage values of the grid. The possible influence of the production of PV installations on the voltage imbalance between phases or on the frequency of the grid has also been analysed in this work. Although the values recorded by the inverters have limitations in their measurements that do not make them valid for assessing events such as the presence of harmonics or flickers, they do allow a first analysis to be made of the influence of PV plant production on some grid parameters, without the need to incorporate additional measurement systems in these renewable installations. However, it is important to be aware of the limitations of the measurements of this equipment and, as far as possible, to choose inverter models that carry out this type of measurement as completely as possible

The Influence of Attitudes towards Cycling and Walking on Travel Intentions and Actual Behavior

[EN] The design and implementation of effective transport policies to reduce car use in urban areas requires a deep comprehension of the factors that influence travel behavior. In this context, psychological factors play an important role in explaining travel-related decisions. The purpose of this paper is to present a study on the effects of cognitive, affective and behavioral attitudes towards the use of walking and cycling on both intentions and real use of cars, public transport, bicycles, and walking. The data used was obtained from an on-line survey carried out in 2017. Analyses included reliability and validity of the questionnaire, exploratory and confirmatory factor analyses, and structural equation models. Results indicate that cycling and walking are evaluated differently in terms of feelings of freedom, pleasure, and relaxation. Positive evaluation of elements related to past walking behavior are negatively associated to both the intention to walk and actual walking. Transport policies to encourage cycling should be different from those with the aim of promoting walking. Positive attitudes towards walking are not enough to increase real walkingThis study has been partially funded by the Ministerio de Economía, Industria y Competitividad of Spain, project MINERVA (TRA2015-71184-C2-1-R).García-Quintero, JD.; Arroyo-López, MR.; Mars, L.; Ruiz Sánchez, T. (2019). The Influence of Attitudes towards Cycling and Walking on Travel Intentions and Actual Behavior. Sustainability. 11(9). https://doi.org/10.3390/su11092554S11

Personal Values, Attitudes and Travel Intentions Towards Cycling and Walking, and Actual Behavior

[EN] Personal values are psychological factors scarcely presented in travel behavior studies, despite their importance in determining life choices, decisions and actions. This paper contributes to filling this gap. The purpose of this study is to analyze the influence of personal values on attitudes, intentions and current cycling and walking. Data regarding personal values, attitudes, intentions and current use of cycling and walking were collected through a web-based survey. Pearson correlations, independent sample non-parametric tests and hierarchical regressions have been used to analyze the information. Reasonably weak but statistically significant direct and indirect effects have been identified between personal values and attitudes towards cycling and walking, intentions and current walking and cycling. Openness to change and self-transcendence values are associated to cycling and walking. Actions to encourage those personal values are needed to improve sustainable transport and mobility.This study has been partially funded by the Ministerio de Economia, Industria y Competitividad of Spain, project MINERVA (TRA2015-71184-C2-1-R).García-Quintero, JD.; Mars, L.; Arroyo-López, MR.; Casquero-Soler, DC.; Di Ciommo, F.; Ruiz Sánchez, T. (2019). Personal Values, Attitudes and Travel Intentions Towards Cycling and Walking, and Actual Behavior. Sustainability. 11(13):1-20. https://doi.org/10.3390/su11133574S1201113Taniguchi, A., & Fujii, S. (2007). Process Model of Voluntary Travel Behavior Modification and Effects of Travel Feedback Programs. Transportation Research Record: Journal of the Transportation Research Board, 2010(1), 45-52. doi:10.3141/2010-06Ogilvie, D., Bull, F., Powell, J., Cooper, A. R., Brand, C., … Mutrie, N. (2011). An Applied Ecological Framework for Evaluating Infrastructure to Promote Walking and Cycling: The iConnect Study. 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B., Nordfjærn, T., Jørgensen, S. H., & Rundmo, T. (2015). The value-belief-norm theory, personal norms and sustainable travel mode choice in urban areas. Journal of Environmental Psychology, 44, 119-125. doi:10.1016/j.jenvp.2015.06.001De Groot, J. I. M., & Steg, L. (2007). Value Orientations and Environmental Beliefs in Five Countries. Journal of Cross-Cultural Psychology, 38(3), 318-332. doi:10.1177/0022022107300278De Groot, J. I. M., & Steg, L. (2007). Value Orientations to Explain Beliefs Related to Environmental Significant Behavior. Environment and Behavior, 40(3), 330-354. doi:10.1177/0013916506297831Ajzen, I. (1991). The theory of planned behavior. Organizational Behavior and Human Decision Processes, 50(2), 179-211. doi:10.1016/0749-5978(91)90020-tMajumdar, B. B., & Mitra, S. (2015). Identification of factors influencing bicycling in small sized cities: A case study of Kharagpur, India. 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Necesidad de nuevos marcos organizativos universitarios desde la responsabilidad social universitaria

El artículo analiza los rasgos fundamentales del nuevo modelo organizacional aplicado a la gerencia universitaria con sentido de la responsabilidad social. La metodología aplicada se basó en el uso de técnicas de investigación cuantitativas aplicadas a seis universidades públicas venezolanas. El objetivo de esta investigación consistió en formular estrategias para impulsar el desarrollo de un nuevo modelo organizacional para las universidades. Los resultados demandan de las instituciones de educación superior una postura más proactiva y pertinente para hacer sus aportes destinados a la superación de los problemas de la sociedad

Propuesta estratégica de mejora en la implementación de los estándares mínimos del Sistema de Gestión de la Seguridad y Salud en el Trabajo en la empresa Thomas Kids para el segundo semestre del 2019 y principios del 2020

La empresa Thomas Kids, para crear un ambiente laboral con condiciones favorables a las personas que allí laboran, mejorar sus procesos, la productividad y así mismo mejorar su imagen corporativa; propone una propuesta estratégica de mejora en la implementación de los estándares mínimos del Sistema de Gestión de la Seguridad y Salud en el Trabajo que de ahora en adelante llamaremos SG-SST el cual permitirá que el empleador desarrolle un proceso lógico, basado en la mejora continua, con el objetivo de gestionar los peligros y riesgos que puedan afectar la seguridad y la salud de sus trabajadores. Teniendo en cuenta la importancia de prevenir las lesiones y enfermedades causadas por las condiciones de trabajo a los cuales estarán expuestos los trabajadoresStrategic proposal for improvement in the of the minimum standards of the occupational health and safety management system at Thomas Kids for the second half of 2019 and early 202

Esquizofrenia resistente: artículo de revisión

Schizophrenia is a high-impact psychiatric disease that affects the quality of life of those who suffer from it with signs and symptoms that produce excitement, altered perception, delusional behavior, hallucinations and disorganized speech, they also present negative symptoms that cause disconnection from the environment , although the majority of patients with schizophrenia respond to treatment with first or second generation neuroleptics, up to a third of them do not respond and are resistant to treatment in the range of 13 to 43%, several hypotheses have been proposed regarding the underlying neurobiological mechanism of refractory schizophrenia, including dopamine hypersensitivity, hyperdopaminergic and normodopaminergic subtypes, glutamate dysregulation, inflammation and oxidative stress, and serotonin dysregulation, leading to resistance to drugs used to treat this disease.La esquizofrenia es una enfermedad psiquiátrica de alto impacto que afecta la calidad de vida de aquella que lo padece con signos y síntomas que producen excitación, alteración de la percepción, conductas delirantes, alucinaciones y habla desorganizada, también presentan síntomas negativos que ocasionan desconexión del entorno, si bien la mayoría de los pacientes con esquizofrenia responden al tratamiento con neurolépticos de primera o segunda generación, hasta un tercio de ellos no responden y son resistentes al tratamiento en el rango de 13 a 43 %, se han propuesto varias hipótesis con respecto al mecanismo neurobiológico subyacente de la esquizofrenia refractaria, incluida la hipersensibilidad a la dopamina, los subtipos hiperdopaminérgicos y normodopaminérgicos, la desregulación del glutamato, la inflamación y el estrés oxidativo, y la desregulación de la serotonina, produciendo resistencia a medicamentos para tratar esta enfermedad

Risk Factors and Predictive Score for Bacteremic Biliary Tract Infections Due to Enterococcus faecalis and Enterococcus faecium: a Multicenter Cohort Study from the PROBAC Project

Biliary-tract bloodstream infections (BT-BSI) caused by Enterococcus faecalis and E. faecium are associated with inappropriate empirical treatment and worse outcomes compared to other etiologies. The objective of this study was to investigate the risk factors for enterococcal BT-BSI. Patients with BT-BSI from the PROBAC cohort, including consecutive patients with BSI in 26 Spanish hospitals between October 2016 and March 2017, were selected; episodes caused by E. faecalis or E. faecium and other causes were compared. Independent predictors for enterococci were identified by logistic regression, and a predictive score was developed. Eight hundred fifty episodes of BT-BSI were included; 73 (8.5%) were due to target Enterococcus spp. (48 [66%] were E. faecium and 25 [34%] E. faecalis). By multivariate analysis, the variables independently associated with Enterococcus spp. were (OR; 95% confidence interval): cholangiocarcinoma (4.48;1.32 to 15.25), hospital acquisition (3.58;2.11 to 6.07), use of carbapenems in the previous month (3.35;1.45 to 7.78), biliary prosthesis (2.19;1.24 to 3.90), and moderate or severe chronic kidney disease (1.55;1.07 to 2.26). The AUC of the model was 0.74 [95% CI0.67 to 0.80]. A score was developed, with 7, 6, 5, 4, and 2 points for these variables, respectively, with a negative predictive value of 95% for a score # 6. A model, including cholangiocarcinoma, biliary prosthesis, hospital acquisition, previous carbapenems, and chronic kidney disease showed moderate prediction ability for enterococcal BT-BSI. Although the score will need to be validated, this information may be useful for deciding empirical therapy in biliary tract infections when bacteremia is suspected. IMPORTANCE Biliary tract infections are frequent, and a significant cause of morbidity and mortality. Bacteremia is common in these infections, particularly in the elderly and patients with cancer. Inappropriate empirical treatment has been associated with increased risk of mortality in bacteremic cholangitis, and the probability of receiving inactive empirical treatment is higher in episodes caused by enterococci. This is because many of the antimicrobial agents recommended in guidelines for biliary tract infections lack activity against these organisms. To the best of our knowledge, this is the first study analyzing the predictive factors for enterococcal BT-BSI and deriving a predictive score.8 página

Innovación, desarrollo tecnológico y gestión : una construcción desde la investigación

Libro que compila investigaciones de carácter aplicadas y descriptivas en materia de innovación y desarrollo tecnológico, gestión organizacional y empresarial orientada a productividad, rentabilidad, competitividad y sostenibilidadBook that compiles researches of applied and descriptive character in the matter of innovation and technological development, organizational and business management oriented to productivity, profitability, competitiveness and sustainabilityCapítulo 1. Material compuesto para la construcción a partir de la celulosa del papel y cartón reciclado / Carlos Arturo Tamayo S; Nicolás Montero Camacho; Fredy Antonio Herrera -- Capítulo 2. Tecnologías de conservación para base de sopa de frijol rojo (phaseolus vulgaris) y vegetales / Yaceris Castro Escorcia; Teresa Altamar Pérez; Enedys Florez Cortés; Ángela Ortiz Ruiz. Capítulo 3. Utilización de harina compuesta de frijol caupi (vigna unguiculata) en masas para alimentos congelados / Marcela Villalba Cadavid; Matilde Rodríguez Muñoz; Beatriz Fernández; Juan Mendoza Combatt -- Capítulo 4. Elaboración de biorrecubrimiento comestible para carne de hamburguesa como alternativa de conservación y condimento natural / Camila Andrea Ubaque Beltrán. CAPÍTULO 5. Identificación de alternativas de industrialización de productos y subproductos agroindustriales en nuevos materiales bio poliméricos / Luz Henao Díaz; Deya Pérez Zúñiga; Herold Arango Gómez. Capítulo 6. SCADA inalámbrico para monitoreo de sistemas de energía solar / Nelson Giovanni Agudelo Cristancho; Juan Carlos Amezquita Tovar; Ángela María Montoya Castro. -- Capítulo 7. Evaluación de la calidad del agua para consumo humano del corregimiento de Jaraquiel, Montería, Córdoba / Carlos Burgos Galeano; Álvaro Aleán Vásquez; Paula Estrada Palencia -- Capítulo 8. Optimización del sistema de abastecimiento de agua en la comunidad de Jaraquel, Montería Colombia / Carlos Burgos Galeano; Pedro Ramos Tejada; Paula Estrada Palencia; Jhon Sánchez Correa. -- Capítulo 9. Ejecución y sostenibilidad de proyectos productivos en la microrregión cafetera del municipio de Ciénaga, Magdalena / Sugey Issa Fontalvo; Eduardo Robles Panetta; Freddy González Castillo. -- Capítulo 10. Aplicación del método cualitativo por puntos para determinar aspirante favorito a cargos directivos en IES / Zamir Martelo Ballesteros; Raúl Martelo Gómez; Luis Tovar Garrido; Natividad Villabona Gómez; David Franco Borré. -- Capítulo 11 Responsabilidad social en comunidades indígenas orientada al diseño de automatización de válvulas del gasoducto Riohacha-Maicao / Gelvis Melo Freile; César Rivera Romero; Jesús García Guiliany. -- Capítulo 12 Fortalecimiento de la gestión económica de las Mipymes a través de la consultoría / Gloria Amparo Acosta Romero; Mónica Andrade Ríos; Karen Roxana Sánchez. -- Capítulo 13. El compromiso como valor en la responsabilidad social universitaria / Maura Quintero Gutiérrez, Dubys Villarreal Torres; Jesús García Guiliany; Annherys Paz Marcano; Marieth Orcasitas Peñaloza. -- Capítulo 14. Educación financiera como alternativa de desarrollo económico y social para el distrito de Riohacha / Henitzo Martínez Pinedo; Darcy Luz Mendoza; Martha Jaramillo Acosta; Edwin Salas Solano. -- Capítulo 15. Tecnologías de información y comunicación en proceso contable y financiero en pymes del sector turístico / Martha Josefina Castrillón Rois; Edilberto Rafael Santos Moreno; Lorena Esther Gómez Bermúdez; Génesis Barros González. -- Capítulo 16. Aplicación de brainstorming y problem trees para determinar factores que inciden en enseñanza del inglés / Jesús Llerena; Raúl J. Martelo; Jhon Cuesta; Javier Pinedo; David Franco.-- Capítulo 17. Incidencia del marketing en las microempresas del sector comercio en Rionegro Antioquia: conceptualización / Santiago Álzate Carmona; María Yamile Mazo Gil; Leidy García Jaramillo. -- Capítulo 18. 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