Capacitación y calidad de servicio del personal operativo de la Empresa Legall S.A.C., distrito de Lince

La presente investigación tuvo como objetivo principal determinar la relación que existe entre la capacitación y calidad de servicio del personal operativo de la empresa Legall S.A.C., distrito de Lince. El tipo de investigación es aplicada, de nivel descriptivo correlacional, con diseño no experimental corte transversal y de enfoque cuantitativo, de método hipotético deductivo. Además, la población del objetivo de estudio estuvo conformada por el total de 71 colaboradores del área operativa de la empresa, a quienes se les formulo una encuesta de 30 ítems por la variable capacitación y 30 ítems por la variable calidad de servicio. Para la validez de los instrumentos se utilizó el juicio de cinco expertos entre teóricos y metodológicos, su confiabilidad de los instrumentos se manejó mediante el alfa de Cronbach, que se calculó con la ayuda del programa SPSS que se obtuvo como resultado para la primera variable capacitación 0.898 de confiablidad y para la segunda variable calidad de servicio 0.883 de confiabilidad. Para concluir el juicio global del cliente acerca de la excelencia o superioridad del servicio que surge de la comparación entre las expectativas previas de los usuarios sobre el mismo y las percepciones acerca del desempeño del servicio recibido

Conflitos e novos desafios do direito: Política, meio ambiente e novas tecnologias

A linha mestra que orientou as discussões que resultaram neste livro foi a mudança nos padrões da política e do estado, do meio ambiente e das novas tecnologias que implicam conflitos e novos desafios ao Direito, especialmente no direito público, foco principal da obra concebida. Novas perspectivas com grandes repercussões ambientais, sindicais, políticas, tributárias e, por que não, em toda a sociedade mundial. Além da coleção de trabalhos resultantes nesta obra foi lançado, também os anais dos artigos apresentados pelos inscritos nos grupos de trabalhos coordenados pelos professores

Mineralogical evolution of cement pastes at early ages based on thermogravimetric analysis (TGA)

[EN] Ordinary thermogravimetric analysis (TG) and high-resolution TG tests were carried out on three different Portland cement pastes to study the phases present during the first day of hydration. Tests were run at 1, 6, 12 and 24 h of hydration, in order to determine the phases at these ages. High-resolution TG tests were used to separate decompositions presented in the 100¿200 C interval. The non-evaporable water determined by TG was used to determine hydration degree for the different ages. The effect of particle size distribution (PSD) on mineralogical evolution was established, as well as the addition of calcite as mineralogical filler. Finer PSD and calcite addition accelerate the hydration process, increasing the hydration degree on the first day of eaction between water and cement. According to high-resolution TG results, it was demonstrated that ettringite was the only decomposed phase in the 100¿200 C interval during the first 6 h of hydration for all studied cements. C-S-H phase starts to appear in all cements after 12 h of hydration.Funding was provided by Colciencias (Grant No. Convocatoria 567-2012).Gaviria, X.; Borrachero Rosado, MV.; Paya Bernabeu, JJ.; Monzó Balbuena, JM.; Tobón, J. (2018). Mineralogical evolution of cement pastes at early ages based on thermogravimetric analysis (TGA). Journal of Thermal Analysis and Calorimetry. 132(1):39-46. https://doi.org/10.1007/s10973-017-6905-0S39461321Benboudjema F, Meftah JM, Torernti F. Interaction between drying, shrinkage, creep and cracking phenomena in concrete. Eng Struct. 2005;27:239–50.Holt E. Contribution of mixture design to chemical and autogenous shrinkage of concrete at early ages. Cem Concr Res. 2005;35:464–72.Darquennes A, Staquet S, Delplancke-Ogletree MP, Espion B. Effect of autogenous deformation on the cracking risk of slag cement concretes. Cem Concr Compos. 2011;33:368–79.Slowik V, Schmidt M, Fritzsch R. Capillary pressure in fresh cement-based materials and identification of the air entry value. Cem Concr Compos. 2008;30(7):557–65.Evju C, Hansen S. Expansive properties of ettringite in a mixture of calcium aluminate cement, Portland cement and ß-calcium sulfate hemihydrates. Cem Concr Res. 2001;31:257–61.Bentz DP, Jensen OM, Hansen KK. Olesen, Stang, H. Haecker, C.J. Influence of cement particle-size distribution on early age autogenous strain and stresses in cement-based materials. J Am Ceram Soc. 2001;84(1):129–35.Barcelo L, Moranville M, Clavaud B. Autogenous shrinkage of concrete: a balance between autogenous swelling and self-desiccation. Cem Concr Res. 2005;35(1):177–83.Bouasker M, Mounanga P, Turcry P, Loukili A, Khelidj A. Chemical shrinkage of cement pastes and mortars at very early age: effect of limestone filler and granular inclusions. Cem Concr Compos. 2008;30(1):13–22.Bentz DP. A review of early-age properties of cement-based materials. Cem Concr Res. 2008;38(2):196–204.Ozawa T. Controlled rate thermogravimetry. New usefulness of controlled rate thermogravimetry revealed by decomposition of polyimide. J Therm Anal Calorim. 2000;59:375–84.Ramachandran VS, Paroli RM, Beaudoin JJ, Delgado AH. Thermal analysis of construction materials. Building materials series. New York: Noyes Publications; 2003.Zanier A. High-resolution TG for the characterization of diesel fuel additives. J Therm Anal Calorim. 2001;64:377–84.Tobón JI, Payá J, Borrachero MV, Restrepo OJ. Mineralogical evolution of Portland cement blended with silica nanoparticles and its effect on mechanical strength. Constr Build Mater. 2012;36:736–42.Singh M, Waghmare S, Kumar V. Characterization of lime plasters used in 16th century Mughal Monument. J Archeol Sci. 2014;42:430–4.Majchrzak-Kuçeba I. Thermogravimetry applied to characterization of fly ash-based MCM-41 mesoporous materials. J Therm Anal Calorim. 2012;107:911–21.Silva ACM, Gálico DA, Guerra RB, Legendre AO, Rinaldo D, Galhiane MS, Bannach G. Study of some volatile compounds evolved from the thermal decomposition of atenolol. J Therm Anal Calorim. 2014;115:2517–20.Rios-Fachal M, Gracia-Fernández C, López-Beceiro J, Gómez-Barreiro S, Tarrío-Saavedra J, Ponton A, Artiaga R. Effect of nanotubes on the thermal stability of polystyrene. J Therm Anal Calorim. 2013;113:481–7.Yamarte L, Paxman D, Begum S, Sarkar P, Chambers A. TG measurement of reactivity of candidate oxygen carrier materials. J Therm Anal Calorim. 2014;116:1301–7.Borrachero MV, Payá J, Bonilla M, Monzó J. The use of thermogravimetric analysis technique for the characterization of construction materials. The gypsum case. J Therm Anal Calorim. 2008;91(2):503–9.Tobón JI, Payá J, Borrachero MV, Soriano L, Restrepo OJ. Determination of the optimum parameters in the high resolution thermogravimetric analysis (HRTG) for cementitious materials. J Therm Anal Calorim. 2012;107:233–9.Kuzielova E, Žemlička M, Másilko, J, Palou, M.T. Effect of additives on the performance of Dyckerhoff cement, Class G, submitted to simulated hydrothermal curing. J Therm Anal Calorim. Accepted 29 Oct 2017Genc M, Genc ZK. Microencapsulated myristic acid–fly ash with TiO2 shell as a novel phase change material for building application. J Therm Anal Calorim. Accepted 24 Oct 2017.Singh M, Kumar SV, Waghmare SA. The composition and technology of the 3–4th century CE decorative earthen plaster of Pithalkhora caves, India. J Archeol Sci. 2016;7:224–37.Liu L, Liu Q, Cao Y, Pan WP. The isothermal studies of char-CO2 gasification using the high-pressure thermo-gravimetric method. J Therm Anal Calorim. 2015;120:1877–82.Majchrzak-Kuce I, Bukalak-Gaik D. Regeneration performance of metal–organic frameworks TG-vacuum tests. J Therm Anal Calorim. 2016;125:1461–6.Ion RM, Radovici C, Fierascu RC, Fierascu I. Thermal and mineralogical investigations of iron archaeological Materials. J Therm Anal Calorim. 2015;121:1247–53.Rupasinghe M, San Nicolas R, Mendis P, Sofi M, Ngo T. Investigation of strength and hydration characteristics in nano-silica incorporated cement paste. Cem Concr Compos. 2017;80:17–30.Esteves PL. On the hydration of water-entrained cement–silica systems: combined SEM, XRD and thermal analysis in cement pastes. Thermochim Acta. 2011;518:27–35.Riesen R. Adjustment of heating rate for maximum resolution in TG and TMA (MaxRes). J Therm Anal. 1998;53:365–74.Lim S, Mondal P. Micro- and nano-scale characterization to study the thermal degradation of cement-based materials. Mater Charact. 2014;92:15–25.Gill PS, Sauerbrunn SR, Crowe BS. High resolution thermogravimetry. J Therm Anal. 1992;38:255–66.Mounanga P, Khelidj A, Loukili A, Baroghel-Bouny V. Predicting Ca(OH)2 content and chemical shrinkage of hydrating cement pastes using analytical approach. Cem Concr Res. 2004;34:255–65.Zeng Q, Li K, Fen-chong T, Dangla P. Determination of cement hydration and pozzolanic reaction extents for fly-ash cement pastes. Constr Build Mater. 2012;27:560–9.Parrott LP, Geiker M, Gutteridge WA, Killoh D. Monitoring Portland cement hydration: Comparison of methods. Cem Concr Res. 1990;20:919–26.Hewlett PC. Lea’s chemistry of cement and concrete. 4th ed. Oxford: Elsevier Science & Technology Books; 2004.ASTM C305 Standard practice for mechanical mixing of hydraulic cement pastes and mortars of plastic consistency. ASTM International, West Conshohocken, PA; 2012.Taylor HF. Cement chemistry. 2nd ed. Westminster: Thomas Telford; 1997.Nadelman EI, Freas DJ, Kurtis KE. Nano- and microstructural characterization of Portland limestone cement paste. In: Nanotechnology in construction. Proceedings of NICOM 5. 2015. p. 87–92

Treatment with tocilizumab or corticosteroids for COVID-19 patients with hyperinflammatory state: a multicentre cohort study (SAM-COVID-19)

Objectives: The objective of this study was to estimate the association between tocilizumab or corticosteroids and the risk of intubation or death in patients with coronavirus disease 19 (COVID-19) with a hyperinflammatory state according to clinical and laboratory parameters. Methods: A cohort study was performed in 60 Spanish hospitals including 778 patients with COVID-19 and clinical and laboratory data indicative of a hyperinflammatory state. Treatment was mainly with tocilizumab, an intermediate-high dose of corticosteroids (IHDC), a pulse dose of corticosteroids (PDC), combination therapy, or no treatment. Primary outcome was intubation or death; follow-up was 21 days. Propensity score-adjusted estimations using Cox regression (logistic regression if needed) were calculated. Propensity scores were used as confounders, matching variables and for the inverse probability of treatment weights (IPTWs). Results: In all, 88, 117, 78 and 151 patients treated with tocilizumab, IHDC, PDC, and combination therapy, respectively, were compared with 344 untreated patients. The primary endpoint occurred in 10 (11.4%), 27 (23.1%), 12 (15.4%), 40 (25.6%) and 69 (21.1%), respectively. The IPTW-based hazard ratios (odds ratio for combination therapy) for the primary endpoint were 0.32 (95%CI 0.22-0.47; p < 0.001) for tocilizumab, 0.82 (0.71-1.30; p 0.82) for IHDC, 0.61 (0.43-0.86; p 0.006) for PDC, and 1.17 (0.86-1.58; p 0.30) for combination therapy. Other applications of the propensity score provided similar results, but were not significant for PDC. Tocilizumab was also associated with lower hazard of death alone in IPTW analysis (0.07; 0.02-0.17; p < 0.001). Conclusions: Tocilizumab might be useful in COVID-19 patients with a hyperinflammatory state and should be prioritized for randomized trials in this situatio

Efecto del consumo de un jugo de frutos rojos y uva rico en polifenoles procesado con ultrasonido en ratas Wistar con diabetes inducida

Tesis de maestría presentada al Instituto de Ciencias Básicas de la Universidad Veracruzana. Región Xalapa

LICUACIÓN DE UN CARBÓN BITUMINOSO VENEZOLANO EN UN SISTEMA DE SALES FUNDIDAS: EFECTO DE LA TEMPERATURA, PRESIÓN Y COMPOSICIÓN

Fue evaluado el efecto de la presi&oacute;n y la temperatura sobre la conversi&oacute;n a l&iacute;quidos para el carb&oacute;n de Guasare (Mina Paso Diablo, Paleoceno) utilizando como agentes de licuaci&oacute;n los sistemas de sales fundidas de composici&oacute;n eut&eacute;ctica FeCl3-KCl-LiCl, FeCl3-ZnCl2, AlCl3-KCl-LiCl, SnCl2-ZnCl2 y SnCl2-KCl, que se comportaron como catalizadores y a la vez como solventes. Las temperaturas de operaci&oacute;n fueron 220 y 300 &ordm;C, a presi&oacute;n atmosf&eacute;rica y a 20 atm. Los l&iacute;quidos obtenidos fueron fraccionados utilizando piridina. Los rendimientos de licuaci&oacute;n variaron entre 3 y 65%, observando efectos desfavorables a alta presi&oacute;n y temperatura para los sistemas de sales conteniendo Fe, a causa de reacciones colaterales como gasificaci&oacute;n y cambios redox. Los mejores resultados fueron obtenidos en todas las condiciones empleadas para el sistema AlCl3-KCl-LiCl, con un m&iacute;nimo de conversi&oacute;n de 38% a 200&ordm;C y 1 atm, y m&aacute;ximo de 65% a 300&ordm;C y 20 atm. La conversi&oacute;n a solubles en piridina fue siempre baja en los l&iacute;quidos obtenidos a partir de sistemas de sales con Fe (menores a 45%) pero sustancialmente mayores en los dem&aacute;s casos, sobre todo en las sales AlCl3-KCl-LiCl y SnCl2-KCl, donde la fracci&oacute;n soluble en piridina alcanz&oacute; 88 y 89% respectivamente.ABSTRACTIn this work, the conversion of Guasare coal to liquids using molten salts (FeCl3-KCl-LiCl, FeCl3-ZnCl2, AlCl3-KCl-LiCl, SnCl2-ZnCl2 and SnCl2-KCl in eutectic composition) as liquefaction agents was evaluated, at mild conditions (220 and 300 &ordm;C, 1 and 20 atm) in order to establish the extent of the conversion and the product distribution. Obtained liquids were fractionated using pyridine. Liquefaction yields varied between 3 &ndash; 65 %, with a notorious decrease at high pressure and temperature for Fe-containing salts, due to collateral reactions (mainly gasification and redox changes). The best result was obtained, in all employed conditions, for the AlCl3-KCl-LiCl system, with the lower conversion (38%) at 200&ordm;C and 1 atm, whereas the highest yield (65%)at 300&ordm;C and 20 atm. Conversion to pyridinesoluble compounds was always low in experiments with Fe-containing salts (lower than 45%) but stronger high in the other systems, mainly with the salts AlCl3-KCl- LiCl and SnCl2-KCl, with 88 and 89 %, respectively, of pyridine-soluble compounds

Nitrogen in the defense system of Annona emarginata (Schltdl.) H. Rainer.

The concentration of nitrogen can generate different strategies in plants in response to stress. In this study, we investigated how nitrogen concentration interferes with the defense system of Annona emarginata. Low concentrations of nitrogen increased the allocation of photosynthetic resources to carbon metabolism, resulting in an increase in the synthesis of volatile substances involved in signaling and defense that contributed to antioxidant enzymes in overcoming stress. The availability of nitrogen at 5.62 mM concentration might have helped to induce increased resistance in the plants because at this concentration, signaling substances and defense substances (monoterpenes and sesquiterpenes) were observed. Plants cultivated with the highest nitrate concentration displaced energy for the reduction of this ion, likely forming nitric oxide, a signaling molecule. This condition, together with the decrease in carbon skeletons, may have contributed to the lower synthesis of volatile substances of the specialized metabolism that are also involved with signaling. Varying the nitrogen in Annona emarginata cultivation revealed that depending on the concentration, volatile substances show higher or lower synthesis and participation in the system of signaling and defense in the plant. These results may suggest that volatile substances participate in resistance to pests and diseases, which is a necessary condition for Annona emarginata to be preferentially used as rootstock for Annona x atemoya