Un enfoque de bajo costo para monitorear la salud estructural de los puentes peatonales

Changes in dynamic properties of structures, such as damping ratios and natural frequencies can be detected by periodic monitoring (e.g. one time by year). These changes are often indications of structural damage thereby, the maintenance or demolition of the structure can be doing in due time. In the case of pedestrian bridges, people’s movements may produce a resonance state, which leads to excessive deflection that accelerates the deterioration of these structures. Typically, these dynamic properties are detected by using high-cost vibration measurement equipment to achieve high levels of precision (i.e. a very low noise levels). This article studies the measurement of dynamic properties in pedestrian bridges using a tri-axial accelerometer integrated into a mobile phone as a low-cost and alternative practice. Accelerations were recorded on a steel pedestrian bridge (flexible) and on a post-tensioned concrete pedestrian bridge (rigid) located in Barranquilla City (Colombia). Vibrations were induced by a person (e.g., by jumping). Previous studies based on traditional measuring techniques show that two dominant frequencies in both types of bridges can be identified. However, in this study a reliable damping ratio could only be established for the steel bridge that it is associated with the flexibility and the low amplitude of the induced vibrations by a single pedestrian use

Registro de información en motores de automóviles y desarrollo de un ciclo de conducción piloto para la ciudad de Pereira usando herramientas de diagnóstico de bajo costo

(Eng) The objective of this paper is to present a methodology designed to develop a driving cycle to model traffic in the Pereira city in Colombia. Under the scope of this pilot work, four different gasoline passenger cars furnished with real time datalogging equipment were used to collect speed-time data under actual traffic along Pereira urban area. The speed-acceleration characteristics were analyzed, and target driving parameters were defined and evaluated. The designed method for building the driving cycle was then applied. As a result, a simple driving schedule for analyzing propulsion, fuel consumption rate, and emission control strategies of automobiles under Pereira downtown conditions has been proposed. Under the scope of the same project, was also studied the utility of the engine specific data collected during the vehicle operation for the purposes of engine performance assessment.(Spa) El objetivo de este trabajo es presentar una metodología para la obtención de un ciclo de conducción representativo del tráfico en la ciudad de Pereira, Colombia, usando herramientas de bajo costo. Se escogieron cuatro vehículos equipados con sistemas de registro de velocidad y aceleración para circular en uno de los corredores viales más congestionados de la ciudad. Las características de velocidad y aceleración fueron analizadas y se evaluaron y definieron los parámetros de conducción. Se diseñó un método para construir el ciclo de conducción y se construyó el ciclo. Como resultado, se obtuvo un ciclo simple de conducción que puede servir de referencia para el análisis de consumo de combustible y diseño de estrategias para control de emisiones de automóviles bajo las condiciones de operación en la zona urbana de Pereira. En el ámbito del mismo proyecto, también se estudió la utilidad de la información recolectada, con herramientas de diagnóstico de bajo costo, durante la operación de los vehículos para propósitos de evaluación del desempeño de los motores

Renormalization of a model for spin-1 matter fields

In this work, the one-loop renormalization of a theory for fields transforming in the $(1,0)\oplus(0,1)$ representation of the Homogeneous Lorentz Group is studied. The model includes an arbitrary gyromagnetic factor and self-interactions of the spin 1 field, which has mass dimension one. The model is shown to be renormalizable for any value of the gyromagnetic factor.Comment: 15 pages, 9 figure

Geophysical Investigations in the Old Panama Archaeological Site

The results of geophysical prospections in an archaeological site of hispanic type in Panama (Central America) are presented in this article. The archaeological site of Old Panama has been intensively investigated with the objective to know the space – time organization of man in the past. A magnetic prospection was developed in the central sector of the site; the rank of magnitude of the magnetic anomalies allowed the identification of certain characteristics of hispanic type and in addition, the presence of metallic devices, typical of more recent occupation times. On the other hand, the results of three electrical tomographies are presented. From these results it was possible to identify the depth of the metallic objects detected by magnetic prospection.The results of geophysical prospections in an archaeological site of hispanic type in Panama (Central America) are presented in this article. The archaeological site of Old Panama has been intensively investigated with the objective to know the space – time organization of man in the past. A magnetic prospection was developed in the central sector of the site; the rank of magnitude of the magnetic anomalies allowed the identification of certain characteristics of hispanic type and in addition, the presence of metallic devices, typical of more recent occupation times. On the other hand, the results of three electrical tomographies are presented. From these results it was possible to identify the depth of the metallic objects detected by magnetic prospection

La Teología Fundamental y la salida del desierto

Para comenzar esta exposición hemos elegido la parábola que narra el P. Rino Fisichella en su libro "Introduzione alla Teología Fondamentale".El autor toma la imagen del Pueblo de Israel, relatado en el libro de los Números, que antes de dejar el desierto Yahvé pide a Moisés que haga hacer el censo de todo el pueblo y, solo después de reagruparlo en tribus, podrán emprender el camino que los llevará a la tierra prometida. El camino que los conducirá a su destino final y que no estará libre de peligros

Evaluación del potencial oncolítico del rotavirus en la línea celular Sp2/0-Ag14 de mieloma de ratón

Introduction: Cancer is the second leading cause of death in the United States, surpassed only by cardiovascular disease. However, cancer has now overtaken cardiovascular disease as the main cause of death in 12 countries in Western Europe. The burden of cancer is posing a major challenge to health care systems worldwide and demanding improvements in methods for cancer prevention, diagnosis, and treatment. Alternative and complementary strategies for orthodox surgery, radiotherapy, and chemotherapy need to be developed.Objective: To determine the oncolytic potential of tumor cell-adapted rotavirus in terms of their ability to infect and lysate murine myeloma Sp2/0-Ag14 cells.Materials and methods: We inoculated rotaviruses Wt1-5, WWM, TRUYO, ECwt-O, and WTEW in Sp2/0-Ag14 cells and we examined their infectious effects by immunocytochemistry, immunofluorescence, flow cytometry, and DNA fragmentation assays.Results: Rotavirus infection involved the participation of some heat shock proteins, of protein disulfide isomerase (PDI), and integrin β3. We detected the accumulation of viral antigens within the virus-inoculated cells and in the culture medium in all the rotavirus isolates examined. The rotavirus-induced cell death mechanism in Sp2/0-Ag14 cells involved changes in cell membrane permeability, chromatin condensation, and DNA fragmentation, which were compatible with cytotoxicity and apoptosis.Conclusions: The ability of the rotavirus isolates Wt1-5, WWM, TRUYO, ECwt-O, and WTEW to infect and cause cell death of Sp2/0-Ag14 cells through mechanisms that are compatible with virus-induced apoptosis makes them potential candidates as oncolytic agents.Introducción. El cáncer es la segunda causa de muerte en los Estados Unidos, solamente superado por la enfermedad cardiovascular. Sin embargo, el cáncer aventaja a la enfermedad cardiovascular como primera causa de muerte en doce países de Europa occidental. Se requieren mejores métodos de prevención, diagnóstico y tratamiento para afrontar el gran desafío que el cáncer representa mundialmente para los sistemas de salud, y se necesita desarrollar estrategias alternativas y complementarias a la cirugía, la radioterapia y la quimioterapia convencionales.Objetivo. Evaluar el potencial oncolítico de rotavirus adaptados a células tumorales por su capacidad para infectar y lisar células Sp2/0-Ag14 de mieloma de ratón.Materiales and métodos. Los aislamientos de rotavirus Wt1-5, WWM, TRUYO, ECwt-O y WTEW se inocularon en células Sp2/0-Ag14 y se examinaron sus efectos infecciosos mediante inmunocitoquímica, inmunofluorescencia, citometría de flujo y ensayos de fragmentación del ADN.Resultados. La infección con los rotavirus Wt1-5, WWM, TRUYO, ECwt-O y WTEW implicó la participación de algunas proteínas de choque térmico, la proteína disulfuro isomerasa y la integrina β3. La acumulación de antígenos virales intracelulares y extracelulares se detectó en todos los virus utilizados. Los mecanismos de muerte inducidos por los rotavirus en células Sp2/0-Ag14 indujeron cambios en la permeabilidad de la membrana celular, la condensación de cromatina y la fragmentación de ADN, los cuales fueron compatibles con citotoxicidad y apoptosis.Conclusiones. La capacidad de los rotavirus estudiados para infectar y causar la muerte de células Sp2/0-Ag14 mediante mecanismos compatibles con la apoptosis inducida viralmente los convierte en candidatos potenciales para ser utilizados como agentes oncolíticos

Document management practices in SMEs: An information management capability-based approach

Purpose: This research studied the current document management (DM) practices in small and medium-sized enterprises (SMEs) of a road freight transport sector in a South American city with the aim to determine strengths and challenges for improving information management. Design/methodology/approach: The study was conducted using a survey approach based on measuring information management capabilities (IMC) through the following main dimensions: perception about DM practices, DM policies and tools, IT usage, organizational climate, and problems related to document management. Findings: The main results from the work stated the challenges for these companies in adopting electronic document management systems (EDMS) and handling information effectively even though the business experience. Also, the study highlighted the top management commitment in terms of investments for IMC development. Nevertheless, this economic support tends to be not enough to afford the EDMS implementation. Originality/value: Regarding the importance of information in road freight transport sector, this paper explored DM practices in a field in which no previous studies related to DM had been conducted and set the basis to make decisions to improve information management performance