Comportamiento dinámico de puentes en arco con amortiguadores viscosos

En éste trabajo se presenta la respuesta sísmica analítica de dos puentes en arco de gran luz, sometiéndolos a un movimiento simulado que incluye efectos de fuente cercana. Para reducir la respuesta se exploró su comportamiento conectando los dos extremos del tablero con la subestructura por medio de amortiguadores viscosos. Se llevaron a cabo una serie de análisis en el plano de ambos modelos para identificar los amortiguadores óptimos. Los resultados indicaron que el uso de amortiguadores viscosos con comportamiento no lineal, ofrece una solución práctica para reducir la respuesta dinámica de estas estructuras

La Nube, una plataforma alternativa en una organización educativa

En el entorno académico en el que se desarrollan las Instituciones de Educación Superior (IES), como organizaciones educativas en México, poseen una preocupación sobre la forma de mejorar la enseñanza y cómo hacer que los estudiantes aprendan. Es por ello que se propone una plataforma educativa basada en el cómputo en la Nube en una organización educativa, como es el Instituto Politécnico Nacional (IPN). Se utilizó un estudio exploratorio de tipo descriptivo y cualitativo con la aplicación de cuestionarios además de la observación para demostrar los beneficios en dicha organización para posteriormente utilizarla en las Instituciones Educativas. Se concluye que el cómputo en la nube debido a todos sus beneficios es importante para la educación y sobre todo en la comunicación de los docentes con los estudiantes para que estos puedan adquirir mayores competencias y habilidades en su desarrollo persona y académico

Prototipo de construcción modular con ecomateriales

Para dar respuesta a la necesidad real de crear edificios sostenibles, se hace necesario adoptar una nueva manera de construir que igualmente dé respuesta a las nuevas exigencias técnicas y funcionales. Los nuevos sistemas constructivos basados en la prefabricación responden muy favorablemente a la implantación de los conceptos mencionados, y más concretamente en el caso de la construcción mediante módulos prefabricados, al tratarse de un campo en el que, de una manera más directa y sencilla, se pueden implementar nuevas técnicas y materiales destinados a esa necesaria mejora de la eficiencia en la construcción, en el más amplio sentido de la palabra. El objetivo de este trabajo es mostrar las posibilidades que ofrece la construcción modular en el campo de la sostenibilidad, para lo cual se plantea un desarrollo basado en prototipos modulares prefabricados, que permita aprovechar la capacidad de los ecomateriales y de la tecnología ambiental, al tiempo que posibilita de manera asequible la tan deseable flexibilidad y diversidad funcional. Para ello se parte de un profundo proceso de análisis, tanto de la construcción modular, como del empleo de nuevos materiales ecológicos, lo que ha permitido seleccionar los elementos constructivos más adecuados para aunar políticas de ahorro energético y bienestar, hasta alcanzar una propuesta de Edificación Prefabricada Sostenible y Eficiente energéticamente. El prototipo presentado, por tanto, responde a la necesidad de modernización tecnológica del sector de la construcción y permite avanzar en el conocimiento constructivo de los edificios eficientes y sostenibles.Consejo General de la Arquitectura Técnica de Españ

Routing Topologies of Wireless Sensor Networks for Health Monitoring of a Cultural Heritage Site

This paper provides a performance evaluation of tree and mesh routing topologies of wireless sensor networks (WSNs) in a cultural heritage site. The historical site selected was San Juan Bautista church in Talamanca de Jarama (Madrid, Spain). We report the preliminary analysis required to study the effects of heating in this historical location using WSNs to monitor the temperature and humidity conditions during periods of weeks. To test which routing topology was better for this kind of application, the WSNs were first deployed on the upper floor of the CAEND institute in Arganda del Rey simulating the church deployment, but in the former scenario there was no direct line of sight between the WSN elements. Two parameters were selected to evaluate the performance of the routing topologies of WSNs: the percentage of received messages and the lifetime of the wireless sensor network. To analyze in more detail which topology gave the best performance, other communication parameters were also measured. The tree topology used was the collection tree protocol and the mesh topology was the XMESH provided by MEMSIC (Andover, MA, USA). For the scenarios presented in this paper, it can be concluded that the tree topology lost fewer messages than the mesh topology.The Spanish Ministry of Economy and Competitiveness supported this research under grant numbers BIA2009-14395-C04-01 and TEC2012-38402-C04-03. The present study was also funded under project CGL2010-19554. S. Aparicio benefited from funding provided by the Spanish National Research Council (CSIC) through its Post-graduate Studies Council’s post-doctoral specialisation programme (JAE-Doc). Researcher Martínez-Garrido’s was supported by an International Programme for Recruiting Talent (PICATA) predoctoral fellowship awarded by the Moncloa Campus of International Excellence (UPM-UCM, CSIC). J. Ranz benefited from a FPI grant BES-2010-038826 of the Ministry of Education, Culture and Sports. We acknowledge support by the CSIC Open Access Publication Initiative through its Unit of Information Resources for Research (URICI

Mercadeo de guajolote (Meleagris gallopavo gallopavo) en Los mercados de Oaxaca.

The economic, cultural and social importance of the turkey is evidenced by its wide use in Mexican cuisine, social and religious celebrations. The surpluses produced by backyard farming are sold in local markets, which make it possible to capture income to supplement the diet of producers. The study was conducted in 2014 in the district markets of the Central Valleys region of Oaxaca, Mexico, where 744 surveys were applied in a stratified sampling in a targeted manner. Subsequently, with the data collected, a statistical analysis of independence (X2) was performed (p < 0.05). The result was obtained that participants in the commercialization were mostly women (66%) with an age range of 31-59 years, dedicated to household and farm work. The producers were indifferent to the sex and color of the guajolotes and preferred poults for reproduction and mature turkeys for consumption in mole. In the markets, females (64%) were sold more frequently, weighing approximately 3.1 to 6.1 kg and costing between $231-375 per individual, while males weighed 5.5 to 7 kg and cost between$300-450 per animal.La importancia económica, cultural y social del guajolote se evidencia por su amplio uso en la cocina mexicana, celebraciones sociales y religiosas. Los excedentes producidos por la meleagricultura de traspatio son comercializados en los mercados locales, lo que posibilita captar ingresos que permiten complementar la dieta de los productores. El estudio se realizó en el año 2014 en los mercados distritales de la región de los Valles Centrales de Oaxaca, México donde se aplicaron 744 encuestas en un muestreo estratificado de manera dirigida. Posteriormente, con los datos recabados se realizó un análisis estadístico de independencia (X2) (p<0.05). Se obtuvo como resultado que los participantes de la comercialización fueron en su mayoría mujeres (66%) con un rango de edad de 31-59 años, dedicadas a las labores del hogar y del campo. A los productores fue indiferente el sexo y el color de los guajolotes y prefirieron pavipollos para reproducción y a los maduros para consumo en mole. En los mercados se logró observar una mayor comercialización de las hembras (64%), con un peso aproximado 3.1 a 6.1 kg y un precio que oscila entre $231 y 375 por individuo, mientras que los machos pesaron de 5.5 a 7 kg y costaron entre$300 y 450 para machos por animal

Cardiovascular Screening Practices and Statin Prescription Habits in Patients with Psoriasis among Dermatologists, Rheumatologists and Primary Care Physicians.

Patients with psoriasis have a higher prevalence of cardiovascular risk factors. This study evaluated cardiovascular screening practices and statin prescribing habits among dermatologists, rheumatologists and primary care physicians (PCPs) through an online questionnaire, which was distributed through the Spanish scientific societies of the above-mentioned specialties. A total of 299 physicians (103 dermatologists, 94 rheumatologists and 102 PCPs) responded to the questionnaire. Of these, 74.6% reported screening for smoking, 37.8% for hypertension, 80.3% for dyslipidaemia, and 79.6% for diabetes mellitus. Notably, only 28.4% performed global screening, defined as screening for smoking, hypertension, dyslipidaemia, and diabetes mellitus by the same physician, and 24.4% reported calculating 10-year cardiovascular disease (CVD) risk, probably reflecting a lack of comprehensive cardiovascular risk assessment in these patients. This study also identified unmet needs for awareness of cardiovascular comorbidities in psoriasis and corresponding screening and treatment recommendations among PCPs. Of PCPs, 61.2% reported not being aware of the association between psoriasis and CVD and/or not being aware of its screening recommendations, and 67.6% did not consider psoriasis as a risk-enhancing factor when deciding on statin prescription. Thirteen dermatologists (12.6%) and 35 rheumatologists (37.2%) reported prescribing statins. Among those who do not prescribe, 49.7% would be willing to start their prescription.post-print492 K

Anti-proliferative effect of extremely low frequency electromagnetic field on preneoplastic lesions formation in the rat liver

<p>Abstract</p> <p>Background</p> <p>Recently, extremely low frequency electromagnetic fields (ELF-EMF) have been studied with great interest due to their possible effects on human health. In this study, we evaluated the effect of 4.5 mT - 120 Hz ELF-EMF on the development of preneoplastic lesions in experimental hepatocarcinogenesis.</p> <p>Methods</p> <p>Male Fischer-344 rats were subjected to the modified resistant hepatocyte model and were exposed to 4.5 mT - 120 Hz ELF-EMF. The effects of the ELF-EMF on hepatocarcinogenesis, apoptosis, proliferation and cell cycle progression were evaluated by histochemical, TUNEL assay, caspase 3 levels, immunohistochemical and western blot analyses.</p> <p>Results</p> <p>The application of the ELF-EMF resulted in a decrease of more than 50% of the number and the area of γ-glutamyl transpeptidase-positive preneoplastic lesions (<it>P </it>= 0.01 and <it>P </it>= 0.03, respectively) and glutathione S-transferase placental expression (<it>P </it>= 0.01). The number of TUNEL-positive cells and the cleaved caspase 3 levels were unaffected; however, the proliferating cell nuclear antigen, Ki-67, and cyclin D1 expression decreased significantly (<it>P </it>≤ 0.03), as compared to the sham-exposure group.</p> <p>Conclusion</p> <p>The application of 4.5 mT - 120 Hz ELF-EMF inhibits preneoplastic lesions chemically induced in the rat liver through the reduction of cell proliferation, without altering the apoptosis process.</p

Cabuyaro extradosed bridge project over the Meta river in Colombia

El puente de Cabuyaro está constituido por un tablero extradosado de 4 vanos, con luces 100,9 + 167,8 + 167,8 + 100,9, que discurre sobre el río Meta, en Colombia. El tablero es de hormigón, con un canto de 3,70 m y un ancho de 11,3 m. Las torres son en U y alcanzan una altura de 18 m sobre la rasante. Presenta, en cada semivano, 9 cables extradosados en dos planos, con una separación longitudinal entre cables, en el tablero, de 7 m. La comunicación describe todo el diseño del viaducto, con especial énfasis en los temas sísmicos y en el procedimiento constructivo.Postprint (published version

Induced Systemic Resistance (ISR) and Fe Deficiency Responses in Dicot Plants

Plants develop responses to abiotic stresses, like Fe deficiency. Similarly, plants also develop responses to cope with biotic stresses provoked by biological agents, like pathogens and insects. Some of these responses are limited to the infested damaged organ, but other responses systemically spread far from the infested organ and affect the whole plant. These latter responses include the Systemic Acquired Resistance (SAR) and the Induced Systemic Resistance (ISR). SAR is induced by pathogens and insects while ISR is mediated by beneficial microbes living in the rhizosphere, like bacteria and fungi. These root-associated mutualistic microbes, besides impacting on plant nutrition and growth, can further boost plant defenses, rendering the entire plant more resistant to pathogens and pests. In the last years, it has been found that ISReliciting microbes can induce both physiological and morphological responses to Fe deficiency in dicot plants. These results suggest that the regulation of both ISR and Fe deficiency responses overlap, at least partially. Indeed, several hormones and signaling molecules, like ethylene (ET), auxin, and nitric oxide (NO), and the transcription factor MYB72, emerged as key regulators of both processes. This convergence between ISR and Fe deficiency responses opens the way to the use of ISR-eliciting microbes as Fe biofertilizers as well as biopesticides. This review summarizes the progress in the understanding of the molecular overlap in the regulation of ISR and Fe deficiency responses in dicot plants. Root-associated mutualistic microbes, rhizobacteria and rhizofungi species, known for their ability to induce morphological and/or physiological responses to Fe deficiency in dicot plant species are also reviewed herei

3D internal reconstruction of the case study. Laboratory Investigations

11 páginas; 8 figurasThe main objective of the Heritage Within (HWITHIN) research project is to investigate what is hidden to our naked eye. One of the core actions of the project was to explore the use of Ground Penetrating Radar (GPR) and ultrasonic acoustic tomography to document and reconstruct precisely the interior of the constructive elements, almost on a stone-by-stone basis. However, precisely because it is not visible, the results obtained and the conclusions drawn cannot be verified with the reality. In the case of the Carmo Convent, the structural elements under investigations are the neogothic compound piers of the main nave, reconstructed after the 1755 earthquake. There is insufficient information on the layout of the interior morphology of the pillar’s cross-section. Additionally, finding relatable examples to compare to the compound pillars at the Carmo Convent are quite minimal, making it complicated for even initial assumptions to be established. Therefore, the team decided to construct 1:1 stone replicas of parts of the neogothic stone masonry pillars (the shaft and the pedestal). The specimens were used to assess the feasibility and efficiency of the non-destructive tests applied (GPR and acoustic tomography) to determine the layout of their internal morphology. Since the cross- section of the real pillars of the Carmo Convent is unknown, the replica only precisely depicts the exterior layout of the columns. The shapes of the stones were established on initial guesses based on literature review. Once the limestones were cut, several cross-sectional set-ups were prepared, mainly accounting for a wide range of possible interior core materials (from fully empty core to a solid limestone block filling). Acoustic tomography was carried out for each assembly so that accurate comparisons between the tomographic maps could be made. Moreover, given the known inner composition of the laboratory specimens, the results can help to understand the potential of the tomographic techniques by comparing the results with the expected visible interior. The present chapter shows some of the results obtained during the laboratory investigations, which were essential to interpret the ultrasonic tomography performed on-site at the old convent. The results confirm the potential of acoustic tomography techniques to convey an accurate idea of the cross-sectional elements within the pillar. The tomographic maps may not provide enough precision to determine exact dimensions of the materials and elements within the cross-section, but they can be complemented with GPR investigations and is always useful in a qualitative way, as it can provide information about the structural integrity of the materials and their arrangement.This publication shows the results of the Heritage Within (HWITHIN) European Research Project (Project Reference: 614719-CREA-1- 2019-1-PT-CROSS-SECT-INNOVLAB), co-funded by the Creative Europe Programme of the European Union, under the Cross-sectorial subprogramme, Bridging culture and audiovisual content through digital action