Evaluación niveles de iluminación en interiores y cálculo para instalaciones de alumbrado/Evaluation of interior lighting levels and calculation for lighting facilities

Siendo la iluminación una forma de energía, es uno de los agentes agresivos de tipo físico que inciden sobre el trabajador, pudiendo causar daños en su salud cuando esté fuera del rango tolerable. La presente investigación tiene como objetivo evaluar el nivel de iluminación de los trabajadores de la construcción dentro del área petrolera en el Oriente Ecuatoriano, mientras realizan sus actividades en oficinas. Se contempló la evaluación higiénica del riesgo físico de la Norma Oficial Mexicana, en cuanto a las condiciones de iluminación en los centros de trabajo, luego el valor obtenido se compara con lo establecido en el decreto ejecutivo 2393. Para el cálculo de iluminación general en instalaciones interiores, se utilizó el método denominado Sistema General o del Factor de utilización, que proporciona una iluminancia media. El resultado promedio de la evaluación dio 458,22 luxes, que se encuentra por debajo del nivel mínimo permisible de 500 luxes para trabajos de diseño, revisión y corrección de planos, de modo que es necesaria la intervención mediante un programa de prevención de riesgos físicos por iluminación, para minimizar el riesgo actual y prevenir futuras lesiones oculares o enfermedades profesionales que puedan presentarse al mantener las condiciones actuales de trabajo. Being the lighting a form of energy, it is one of the aggressive agents of physical type that affect the worker, being able to cause damages in his health when he is outside the tolerable range. The objective of this research is to evaluate the level of lighting of construction workers within the oil area in the Ecuadorian Oriente, while carrying out their activities in offices. The hygienic evaluation of the physical risk of the Official Mexican Standard was contemplated, in terms of lighting conditions in the work centers, then the value obtained is compared with that established in executive decree 2393. For the calculation of general lighting in facilities interiors, the method called General System or the Utilization Factor was used, which provides an average illuminance. The average result of the evaluation gave 458.22 luxes, which is below the minimum permissible level of 500 luxes for design work, review and correction of plans, so that intervention is necessary through a program of prevention of physical risks by lighting to minimize the current risk and prevent future eye injuries or occupational diseases that may occur when maintaining current work conditions. Palabras clave: NOM-025, evaluación, iluminación, instalaciones alumbrado. Keywords: NOM-025, evaluation, lighting, installations lighting

Encapsulation efficiency of Lactobacillus plantarum microencapsulado in Acrycoat S100

Several studies have attributed health benefits to probiotics, as the contribution to intestinal microflora activity (Khan et al. 2013). However, adverse conditions in gastrointestinal transit can reduce the viability of probiotics as Lactobacillus plantarum. Acrycoat S100 is a co-polymer from methacrylic acid and methyl methacrylate, water insoluble and soluble in pH ≥ 7. Therefore, microencapsulation of probiotic in Acrycoat S100 could allow microorganism protection until it reach the intestine. The objective of this study was to determine the encapsulation efficiency of L. plantarum microencapsulated in Acrycoat S100.info:eu-repo/semantics/publishedVersio

Genetically engineered silk-based composite biomaterials functionalized with fibronectin type-II that promote cell adhesion

[Excerpt] Recombinant protein-based polymers (rPBPs) are an emerging class of biopolymers inspired by Nature and produced by synthetic protein biotechnology approaches. Due to their exceptional physical-chemical and biological characteristics, as well as their ability to be customized for specific applications, rPBPs have been explored for the development of advanced biomaterials [1]. Within rPBPs, silk-like polymers (SLP) are being utilized in a range of studies in materials science [2]. [...]This work was supported by FCT Funded Project “Chimera” (PTDC/EBB-EBI/109093/2008), by FCT/MEC through Portuguese funds (PIDDAC) – PEst-OE/BIA/UI4050/2014, by the strategic programme UID/BIA/04050/2013 (POCI-01-0145-FEDER-007569) funded by national funds through the FCT I.P. and by the ERDF through COMPETE2020 - Programa Operacional Competitividade e Internacionalização (POCI). TC is thankful to the FCT for its support through Investigador FCT 2015. ARibeiro thanks FCT for the SFRH/BPD/98388/2013 grant. RMachado and AdaCosta acknowledge FCT for SFRH-BPD/86470/2012 and SFRH/BD/75882/2011 grants, respectively

Study of the D^0 \to pi^-pi^+pi^-pi^+ decay

Using data from the FOCUS (E831) experiment at Fermilab, we present new measurements for the Cabibbo-suppressed decay mode $D^0 \to \pi^-\pi^+\pi^-\pi^+$. We measure the branching ratio $\Gamma(D^0 \to\pi^+\pi^- \pi^+\pi^-)/\Gamma(D^0 \to K^-\pi^+\pi^-\pi^+) = 0.0914 \pm 0.0018 \pm 0.0022$. An amplitude analysis has been performed, a first for this channel, in order to determine the resonant substructure of this decay mode. The dominant component is the decay $D^0 \to a_1(1260)^+ \pi^-$, accounting for 60% of the decay rate. The second most dominant contribution comes from the decay $D^0 \to \rho(770)^0\rho(770)^0$, with a fraction of 25%. We also study the $a_1(1260)$ line shape and resonant substructure. Using the helicity formalism for the angular distribution of the decay $D^0 \to \rho(770)^0\rho(770)^0$, we measure a longitudinal polarization of $P_L = (71 \pm 4\pm 2)$%.Comment: 38 pages, 8 figures. accepted for publication in Physical Review

Advanced silk-based genetic polymers with improved cell adhesion properties

[Excerpt] Recombinant protein-based polymers (rPBPs) are an emerging class of genetic polymers inspired by Nature and produced by synthetic protein biotechnology approaches. Due to their exceptional physical-chemical and biological characteristics, as well as their ability to be customized for specific applications, rPBPs have been explored for the development of advanced biomaterials [1]. Most of the polymers used as biomaterials thus far have been chemically synthesized, originating random copolymers with diverse and uncontrolled distribution of molecular weight (MW) and composition. However, advances in recombinant DNA technology allow the biological synthesis of fine-tuned rPBPs with precise control of their composition, polymer size and structure [2]. Furthermore, with the development of recombinant protein engineering and biotechnology, it is now possible to design new bioactive rPBPs by combining active peptides/domains from different natural proteins in the same fusion protein. [...

Balanço do nitrogênio e fósforo em solo com cultivo orgânico de hortaliças após a incorporação de biomassa de guandu.

Os objetivos deste trabalho foram avaliar os efeitos de faixas de guandu (Cajanus cajan) e da incorporação da biomassa proveniente de sua poda na fertilidade do solo e na produtividade de três hortaliças sob cultivo orgânico. O delineamento usado foi de blocos casualizados completos em esquema de parcelas subsubdivididas com três repetições. As produtividades de beterraba, cenoura e feijão-de-vagem não foram afetadas pelos tratamentos. Nas parcelas onde não houve incorporação da biomassa de guandu, o balanço de nitrogênio no sistema foi negativo, ao passo que com a incorporação, esse balanço foi positivo. Embora tenha ocorrido balanço positivo para o fósforo nas parcelas sem a incorporação de biomassa de guandu, houve um aumento significativo na absorção desse elemento pelas hortaliças quando o material foi incorporado. O sistema de cultivo em aléias de guandu pode representar uma prática vantajosa para os produtores orgânicos, por contribuir na manutenção da fertilidade do solo

Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in √s = 7 TeV pp collisions with the ATLAS detector

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb−1 of proton–proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results

Jet size dependence of single jet suppression in lead-lead collisions at sqrt(s(NN)) = 2.76 TeV with the ATLAS detector at the LHC

Measurements of inclusive jet suppression in heavy ion collisions at the LHC provide direct sensitivity to the physics of jet quenching. In a sample of lead-lead collisions at sqrt(s) = 2.76 TeV corresponding to an integrated luminosity of approximately 7 inverse microbarns, ATLAS has measured jets with a calorimeter over the pseudorapidity interval |eta| < 2.1 and over the transverse momentum range 38 < pT < 210 GeV. Jets were reconstructed using the anti-kt algorithm with values for the distance parameter that determines the nominal jet radius of R = 0.2, 0.3, 0.4 and 0.5. The centrality dependence of the jet yield is characterized by the jet "central-to-peripheral ratio," Rcp. Jet production is found to be suppressed by approximately a factor of two in the 10% most central collisions relative to peripheral collisions. Rcp varies smoothly with centrality as characterized by the number of participating nucleons. The observed suppression is only weakly dependent on jet radius and transverse momentum. These results provide the first direct measurement of inclusive jet suppression in heavy ion collisions and complement previous measurements of dijet transverse energy imbalance at the LHC.Comment: 15 pages plus author list (30 pages total), 8 figures, 2 tables, submitted to Physics Letters B. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2011-02