Fuel Cell as Range Extender in Battery Electric Vehicles for Supply Chain Fleets

The aim of this chapter is to present an outlook about implementation of a range extender system based on fuel cells for battery electric vehicles. Such a system is highly feasible to be implemented in electric vehicles, in particular those used by beverage industry in city centres. The tourism is another industry that uses electric vehicles, for instance in resorts, hotels, airports, zoos, etc. As well, public transportation is another sector involved with this vehicular technology. These sectors are all the time looking for high efficiency and low costs; however, they also need to extend the range of the vehicles to fulfill some logistics requirements in a route. This chapter presents a numerical example for illustrating an implementation of fuel cell range extender system. Advantages, disadvantages, and business opportunities in fuel cell technology are presented

Impedance Study on Estimating Electrochemical Mechanisms in a Polymer Electrolyte Fuel Cell During Gradual Water Accumulation

In this study, the change of electrochemical parameters during the gradual water accumulation of a polymer electrolyte fuel cell (PEFC) are estimated using electrochemical impedance spectroscopy (EIS) measurements and an impedance model based on electrode theory during a two-step oxygen reduction reaction (ORR). EIS measurements were carried out in a 5 cm2 H2/O2 PEFC operated under a dead-ended configuration of the gas reactants and during gradual accumulation of water. Kramers-Kronig evaluation demonstrated that the EIS measurements comply with stability and linearity properties and the inductive loops featured at low frequencies are attributed to electrochemical mechanisms within the PEFC and not to instability during gradual water accumulation. The impedance model has been reported in a previous study and simulates inductive loops at low frequencies which are attributed to platinum oxide formation during the ORR. The estimated parameters obtained from this EIS-modelling analysis can provide an insight into the decrease in PEFC performance during flooding conditions. A further qualitative analysis considering the effect of long-term water accumulation on the oxygen-reduction charge transfer resistance is discussed. It is possible to have an insight into the physical mechanisms of the PEFC by combining different experimental techniques and fundamental theory in a complimentary manner

Resilient dragons: Exploring Odonata communities in an urbanization gradient

Cities function as ecological systems composed of a geosphere, a biosphere and an anthroposphere, interacting with each other and generating various selection pressures on urban organisms. Odonates (damselflies and dragonflies) are frequent inhabitants of urban areas, showing no clear or unique responses to urbanization. Thus, we defined an urbanization gradient using a habitat integrity index (HII) calculated for 19 sites in central Mexico, and investigated: a) changes in species richness and abundance along the urbanization gradient; and, b) the relationship between presence of waste of anthropic origin, chemical conditions of water, macrophyte cover, and odonate species richness, abundance and community composition. We analyzed the data for the whole odonate community, as well as for dragonfly and damselfly communities separately in each site. We found higher damselfly species richness and abundance in sites with low urbanization than in sites with high urbanization, and no differences in dragonfly communities along the gradient. We found a positive relationship between dragonfly species richness and abundance and waste percentage and macrophyte cover, and a negative relationship with dissolved solids in water. Our results indicated that odonate communities were fairly tolerant to urbanization and dragonflies were less affected than damselflies. However, we suggest that during design and restructuring of cities, the care and conservation of water bodies and all the life forms that inhabit there, be considered

Música tradicional y procesos de globalización. 80 Nueva Época (2007) septiembre. Antropología. Boletín Oficial del Instituto Nacional de Antropología e Historia

- Presentación por Benigno Casas de la Torre. - Música tradicional e identidades (híbridas) transterritoriales en la era global por Alfonso Muñoz Güemes. - Música tradicional y procesos de globalización por Eduardo Ruiz Castillo. - Toxcatl o el rapto de la música por Tonatiuh Catalá. - Panorama del contexto económico, político, tecnológico y cultural mundial: reflexiones sobre la música tradicional por Marissa Reyes Godínez. - Sones del alma. La música de la gente de Sonora, patrimonio cultural vivo por Alejando Aguilar Zeleny. - Música de tambores y flauta: elementos de identidad en la población yokot’an de Tabasco, México por Miriam Judith Gallegos Gómora. - Construcción de nuevas identidades en la práctica musical del son jarocho por María Aldara Fernández Palomo. - Los conjuntos de arpa grande: aislamiento local en una época global por Alejandro Martínez de la Rosa. - De la guitarra túa a la guitarra industrial: mecanización y masificación de la producción guitarrera en Paracho, Michoacán por Víctor Hernández Vaca. - La música mazateca en la fiesta de muertos de Santa María Chilchotla, Oaxaca por María Cristina Quintanar Miranda. - ¿Tacos con salsa o con catsup? Perspectivas y estrategias para la continuidad cultural por Daniel Sheehy. - El desuso de categorías tradicionales en la interpretación del son jarocho en Los Tuxtlas, Veracruz por Jessica Gottfried. - Más allá de la jarana tradicional por Nidelvia Vela Cano. - El son calentano como elemento de identidad cultural en la Tierra Caliente del Balsas por Raquel G. Paraíso. - De la comarca a la fama mundial. Las transformaciones del Mariachi Vargas de Tecalitlán durante el siglo XX por Jesús Jáuregui. - La música y la danza indígenas como industrias culturales: el caso de la Cumbre Tajín por Ulises Julio Fierro Alonso. - Música p’urhépecha y su difusión masiva: entre el sentimiento y la hibridación por Nelly Calderón de la Barca Guerrero. - La música tradicional y su difusión en la radio del Valle de México por Alberto Zárate Rosales. - El paisaje sonoro de la Ciudad de México. Los castillos pirotécnicos por Mario Mota Martínez. - La música colombiana en México: transculturalidad y procesos identitarios por Darío Blanco Arboleda. - Música tradicional, industria discográfica y globalización por Jaime Sanromán. - Historias verdaderas y el mito globalizado por Steven Loza. - Del surco a la guitarra por Benjamín Muratalla

Proyecto de Tesis II - CI189 - 202101

DESCRIPCIÓN Curso de especialidad en la carrera de ingeniería civil de carácter teórico-práctico dirigido a los estudiantes del 10mo ciclo. El curso Proyecto de Tesis II busca que los estudiantes de Ingeniería Civil apliquen sus capacidades adquiridas durante todos sus estudios, en completar una investigación, que plantea resolver una problemática en una de las líneas de la carrera. Con la ayuda de un docente asesor especialista en el tema lograran redactar el informe de tesis al 100%, este informe será revisado por otro docente especialista que proporciona sugerencias de mejoras a la investigación. Por último, los estudiantes exponen ante un jurado especialista sus resultados quienes evalúan y también hacen sugerencia de mejoras a la investigación. PROPÓSITO En el Perú actualmente existe un gran número de estudiantes de Ingeniería Civil que no cuentan con el título profesional, por no realizar la tesis de investigación, lo cual disminuye significativamente su desarrollo profesional y sus oportunidades laborales. Adicionalmente las leyes Peruanas exigen que para el obtener el bachillerato los estudiantes deben redactar un trabajo de investigación. El curso de proyecto de Tesis 2 permite que los estudiantes puedan desarrollar el 100% de la Tesis y un trabajo de investigación, siendo ambos certificados por un asesor y un jurado evaluador. Este curso contribuye con el desarrollo de las competencias generales de comunicación escrita, comunicación oral, manejo de la información y ciudadanía y las competencias específicas 2, 3, 5 y 6 de ABET, todas a nivel de logro 3. Cuenta con el prerrequisito de Proyecto de Tesis 1

Contemporary use of cefazolin for MSSA infective endocarditis: analysis of a national prospective cohort

Objectives: This study aimed to assess the real use of cefazolin for methicillin-susceptible Staphylococcus aureus (MSSA) infective endocarditis (IE) in the Spanish National Endocarditis Database (GAMES) and to compare it with antistaphylococcal penicillin (ASP). Methods: Prospective cohort study with retrospective analysis of a cohort of MSSA IE treated with cloxacillin and/or cefazolin. Outcomes assessed were relapse; intra-hospital, overall, and endocarditis-related mortality; and adverse events. Risk of renal toxicity with each treatment was evaluated separately. Results: We included 631 IE episodes caused by MSSA treated with cloxacillin and/or cefazolin. Antibiotic treatment was cloxacillin, cefazolin, or both in 537 (85%), 57 (9%), and 37 (6%) episodes, respectively. Patients treated with cefazolin had significantly higher rates of comorbidities (median Charlson Index 7, P <0.01) and previous renal failure (57.9%, P <0.01). Patients treated with cloxacillin presented higher rates of septic shock (25%, P = 0.033) and new-onset or worsening renal failure (47.3%, P = 0.024) with significantly higher rates of in-hospital mortality (38.5%, P = 0.017). One-year IE-related mortality and rate of relapses were similar between treatment groups. None of the treatments were identified as risk or protective factors. Conclusion: Our results suggest that cefazolin is a valuable option for the treatment of MSSA IE, without differences in 1-year mortality or relapses compared with cloxacillin, and might be considered equally effective