Ensayo de radiaciones x y gama en la industria

Informe que da cuenta del uso de radiaciones x y gama en la industria, específicamente en las prácticas de soldadura , trata temas asociados a seguridad radiológica, equipos y dispositivos empleados y su manejo correcto, propiedades de la radiación, practicas recomendadas para la inspección de uniones soldadas, leyes de la física fundamentales que rigen la formación de la imagen radiográfica, equipos de rayos x, elementos, accesorios y uniones soldadasReport that accounts for the use of x and gamma radiation in the industry, specifically in welding practices, deals with issues associated with radiological safety, equipment and devices used and their correct handling, properties of radiation, recommended practices for the inspection of welded joints , fundamental laws of physics that govern the formation of the radiographic image, x-ray equipment, elements, accessories and welded jointsFundamentos teóricos -- Naturaleza y propiedades fundamentales de las radiaciones x y gama -- Estrategias de aprendizaje: Equipos -- Elementos -- Procedimiento para tomar una radiografía -- Estructuras de evaluación: Cálculos -- Observaciones -- Conclusiones -- Cuestionariona97 página

Momento Económico (49)

En este número: "¿Una nueva acumulación originaria?". "El Metro de la Ciudad de México. Desarrollo y perspectivas". "La agonía del Estado empresario". Sección de Indicadores Económicos. "Las 'zonas de producción libre' en la 'restructuración' de la economía mundial". "Estados Unidos: hegemonía en crisis". Sección de América Latina. Temas de Hoy

UNA PLATAFORMA EDUCATIVA PARA EL APRENDIZAJE COLABORATIVO SÍNCRONO: “K’ULU” (AN EDUCATIONAL PLATFORM FOR SYNCHRONOUS COLLABORATIVE LEARNING: “K'ULU”)

Resumen La presente investigación se basa en la descripción de la forma en que se elaboró una plataforma que soporta el aprendizaje colaborativo educativo síncrono denominada “K’ulu’” (Mapache en Maya). En esta plataforma, los alumnos interactúan en forma síncrona por turnos sobre la misma vista, las acciones que cada uno hace en su turno se replica en todas las vistas de cada uno de los participantes (en forma síncrona). Se tiene un área en la que los estudiantes pueden comunicarse entre sí en forma síncrona (un Chat) y ayudarse a resolver los problemas presentados en la plataforma. Esta plataforma contiene varias características como Comunicación síncrona, Contenido multimedia (audio, vídeo, imagen), Libros digitales, Sesiones de aprendizaje entre usuarios que son estudiantes de sexto grado de educación primaria de Chetumal, Quintana Roo. Palabras Claves: Aprendizaje Colaborativo, Chat, Interacción Síncrona, Sesiones de aprendizaje. Abstract This research is based on the description of the way in which a platform that supports synchronous educational collaborative learning (CSCL) called “K’ulu’” (Raccoon in Maya) was developed. In this platform, the students interact synchronously in turns on the same view, the actions that each one does in their turn is replicated in all the views of each of the participants (synchronously). There is an area where students can communicate with each other synchronously (a Chat) and help them solve the problems presented on the platform. This platform contains several features such as Synchronous Communication, Multimedia content (audio, video, image), Digital books, Learning sessions between users who are sixth grade students of Chetumal primary education, Quintana Roo. Keywords: Collaborative Learning, Chat, Synchronous Interaction, Learning Session

Biodiversidad bacteriana en aguas de balnearios mineromedicinales de Ecuador y Venezuela

Las aguas mineromedicinales en Ecuador y Venezuela se utilizan desde hace siglos como medicamentos por la población de estos países. Sin embargo, la biodiversidad bacteriana es poco conocida. Por ello, el objetivo del trabajo fue conocer la biodiversidad bacteriana en el agua de balnearios mineromedicinales de Ecuador y Venezuela. Se tomaron muestras de agua en diversos punto de cada balneario. Los estudios microbiológicos se realizaron siguiendo los esquemas propuestos por MacFaddin, complementadas con las pruebas bioquímicas de las galería API y Microgen. En las aguas de los balnearios de Ecuador se identificaron un total de 284 colonias de los géneros Acidovorax, Acinetobacter, Actinomyces, Aeromonas, Alcaligenes, Bacillus, Brevibacterium, Brevundimonas, Budvicia, Burkholderia, Citrobacter, Corynebacterium, Edwardsiella, Ewingella, Flavobacterium, Kurthia, Micrococcus, Moraxella, Proteus, Pseudomonas, Psychrobacter, Ralstonia, Staphylococcus, Vibrio, Yersinia, Yokonella y Xenorhabdus. En las agua de los balnearios de Venezuela, se logró identificar 158 colonias de los géneros Aeromonas, Alcaligenes, Bacillus, Brevundimonas, Burkolderia, Chromobacterium, Citrobacter, Comamonas, Edwardsiella, Enterobacter, Klebsiella, Kluyvera, Moraxella, Plesiomonas, Proteus, Pseudomonas, Ralstonia, Shewanella, Staphylococcus, Weeksella y Vibrio. Se observo un claro predominio de las bacteria Gram negativas de la clase Gama proteobacterias en los balnearios mineromedicinales de ambos países

Association of the 5HTTLPR Polymorphism with Obesity in Mexican Women with High Native American Ancestry

Aims: The 5HTT gene has been associated with obesity; this study aimed to determine the association between L- and S-alleles at the 5HTTLPR polymorphism with obesity in indigenous Mexican populations. Materials and Methods: A total of 362 individuals, 289 belonging to eight Native American (NA) groups; 40 Mexican mestizos; and 33 Caucasian Mennonites were enrolled in a cross-sectional study. High (≥90%) and low (30 kg/m2 was considered as obese. The L- and S-alleles of the 5HTTLPR locus were identified by PCR; the association between alleles and obesity was performed by logistic regression analysis. Results: A significantly lower prevalence of obesity (35%) was observed in participants from communities with high NA ancestry (p < 0.005). Under a dominant heritance model the L-allele was associated with obesity in women with high NA ancestry (odds ratio [OR] 7.27; 95% confidence interval [CI] 1.6–32.5; p = 0.009) but not in women with low NA ancestry (OR 0.83; 95% CI 0.3–2.2; p = 0.71); no association was observed in men. Conclusion:Our results suggest that the 5HTTLPR L-allele is a risk factor for developing obesity in Mexican women with high NA ancestry (≥90%)

Seminario de Economía Mexicana

Serie de ponencias referentes al Seminario de Economía Mexicana. Memorias del Seminario de Economía Mexicana de 199

Thermocatalytic degradation of lignin monomer coniferyl aldehyde by aluminum–boron oxide catalysts

Two aluminum–boron oxide catalysts were produced via a sol–gel method at pH 3 and 4 during the solution mixing step of the synthesis, these materials were employed in thermocatalytic degradation of coniferyl aldehyde (CA), which was used as a probe molecule of the lignin polymeric molecule and is comprised of the repetitive monomers coniferyl, sinapyl, and paracoumaryl. The two synthesized catalysts were mostly amorphous and mesoporous, aiding in permeability and percolation of CA. A commercial catalyst was compared (Pt/alumina at 1 wt%) with both catalysts synthesized in this work by kinetic tests by varying the CA concentration and inlet temperature. Under the same reaction conditions, the commercial catalyst showed higher activity than the aluminum–boron oxide catalysts, but the synthetic catalysts presented a wider variety of organic products than the commercial catalyst. In particular, two high-value products, isomers of eugenol and isoeugenol, were yielded in higher percentages. The experimental reaction rate data was fit to a Langmuir–Hinshelwood model, and kinetic parameters were analyzed, revealing how the adsorbed CA molecules on the catalytic surface had higher mobility with the synthesized catalyst compared with the commercial catalyst, the value of $\Delta S_{\mathrm{ads}}^{0}$ for the synthetic catalysts were $-$5.48 and $-$4.31 J/mol-K and for the commercial catalyst $-$37.17 J/mol-K

Thermocatalytic degradation of lignin monomer coniferyl aldehyde by aluminum–boron oxide catalysts

Two aluminum–boron oxide catalysts were produced via a sol–gel method at pH 3 and 4 during the solution mixing step of the synthesis, these materials were employed in thermocatalytic degradation of coniferyl aldehyde (CA), which was used as a probe molecule of the lignin polymeric molecule and is comprised of the repetitive monomers coniferyl, sinapyl, and paracoumaryl. The two synthesized catalysts were mostly amorphous and mesoporous, aiding in permeability and percolation of CA. A commercial catalyst was compared (Pt/alumina at 1 wt%) with both catalysts synthesized in this work by kinetic tests by varying the CA concentration and inlet temperature. Under the same reaction conditions, the commercial catalyst showed higher activity than the aluminum–boron oxide catalysts, but the synthetic catalysts presented a wider variety of organic products than the commercial catalyst. In particular, two high-value products, isomers of eugenol and isoeugenol, were yielded in higher percentages. The experimental reaction rate data was fit to a Langmuir–Hinshelwood model, and kinetic parameters were analyzed, revealing how the adsorbed CA molecules on the catalytic surface had higher mobility with the synthesized catalyst compared with the commercial catalyst, the value of $\Delta S_{\mathrm{ads}}^{0}$ for the synthetic catalysts were $-$5.48 and $-$4.31 J/mol-K and for the commercial catalyst $-$37.17 J/mol-K

Guía de práctica clínica para la prevención, diagnóstico, tratamiento y rehabilitación de la falla cardiaca en población mayor de 18 años, clasificación B, C y D

La falla cardíaca es un síndrome clínico caracterizado por síntomas y signos típicos de insuficiencia cardíaca, adicional a la evidencia objetiva de una anomalía estructural o funcional del corazón. Guía completa 2016. Guía No. 53Población mayor de 18 añosN/

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements