417 research outputs found
Construyendo nuevas miradas, buscando un cambio en nuestras ciudades. La experiencia de Río Urbano
No full textInternational audienceThis essay seeks to share the experience of the Rio Urbano organization in San José (Costa Rica), which began as an individual initiative and today is a reference in the environmental management of the country's rivers. Río Urbano's objective is to transform the relationship between urban dwellers and the rivers that flow through them. The present reflection proposes a long-term transversal reading of the actions carried out at the beginning of the collective, the postulates on which they were based and theactivities carried out today. Thereby, the aim is to share its extensive trajectory and contribute to a more global reflection on the scope of this type of initiative to build more sustainable cities.Este ensayo busca compartir la experiencia de la organización Río Urbano en San José (Costa Rica), la cual empezó como iniciativa individual y hoy es una referencia en materia de gestión ambiental de los ríos del país. El objetivo de Río Urbano es transformar el relacionamiento de las personas que habitan las urbes con los ríos que las atraviesan. La presente reflexión propone una lectura transversal, a largo plazo, de las acciones realizadas en los inicios del colectivo, los postulados que las fundamentaron y las actividades efectuadas hoy. De esta manera se pretende compartir su extensa trayectoria y aportar a una reflexión más global sobre el alcance de este tipo de iniciativas para construir ciudades más sostenibles
ASEP
No full text152 PAGCulmina el año 2021 repleto de metas cumplidas y con un alto grado de satisfacción en materia de servicios públicos en nuestro país.
Hemos caminado la milla extra y, a pesar de los tiempos que vivimos, nuestro personal ha cumplido la tarea que demandan los usuarios.
Como dije al iniciar mi gestión, uno de los pilares más importantes sería el recurso humano y lo hemos cumplido. Se han brindado oportunidades de crecimiento y actualizaciones al personal técnico, administrativo y de atención al público que garantizaron un crecimiento en materia regulatoria, acorde con las nuevas tendencias del mercado.2 ejemplare
Educational Software for the subject of Introductions to Civil Engineering
No full textLos nuevos planes de estudio E y la carencia de textos existentes en sus asignaturas, unido a los problemas de impresión que posee Cuba en estos momentos llevan a la necesidad de buscar nuevas vías para garantizar la bibliografía necesaria a los estudiantes. En el caso del plan de estudio de la carrera de Ingeniería Civil de la Facultad de Construcciones que comenzó en el curso 2018 – 2019 (“E”) se insertó una asignatura que motiva y a la vez introduce a los estudiantes en los diferentes campos de acción del Ingeniero Civil, denominada Introducción a la Ingeniería Civil, que consta con un trabajo de curso que desarrolla en los estudiantes habilidades en las futuras funciones que tendrán en la carrera y su vida profesional. Para esto se necesita de un software educativo donde puedan encontrar toda la información necesaria y un documento que los guíe detalladamente en el proceso de enseñanza aprendizaje por ser estudiantes de primer año, con este objetivo se realizó este trabajo.The new study plans and the lack of existing texts in their subjects, together with the problems of printing that Cuba has at the moments, lead to the need to look for new ways to guarantee the necessary bibliography for the students. In the case of the study plan of Civil Engineering career of the Faculty of Constructions that began in the 2018-2019 academic year (“E”), a subject was inserted that motivates and at the same time introduces the students to different fields of actions of de Civil Engineer, named Introductions to Civil Engineering, which consists a course work that develops student’s skills in the future functions they will have in their career and their professional lives. For this is needed an educational software where the students can find all the necessary information and a document that guides them in detail in the teaching-learning process for being first-year students, with this objective this work was done.Facultad de Construcciones. Departamento de Ingeniería Civilnon-publishe
Water Supply Network Partitioning Based on Simultaneous Cost and Energy Optimization
No full textAbstractWater Network Partitioning (WNP) improves water network management, simplifying the computation of water budgets and, consequently, allowing the identification and reduction of water loss. It is achieved by inserting flow meters and gate valves in the network, previously clustered in subsystems. The clustering and partitioning phases are carried out with different procedures. The first one requires clustering algorithms that assign network nodes to each district (or cluster). The second one chooses the boundary pipes where flow meters or gate valves are to be inserted. In this paper, SWANP software is employed to achieve a network clustering through two different algorithms based on a multilevel-recursive bisection and community-structure procedures. After that, a novel multi-objective function is introduced and applied to a large Mexican network integrating both cost and energy performance, thus providing a smart Decision Support System (DSS) based on qualitative and quantitative measures, and diagrams for evaluating the optimal layout in terms of the number of districts, cost, and hydraulic performance
Uso de harina de sangre y bacterias nitrificantes en el crecimiento, rendimiento y tasa fotosintetica del chile pimiento.
No full textUso de harina de sangre y bacterias nitrificantes en el crecimiento, rendimiento y tasa fotosintética del chile pimiento
No full text"La influencia de la harina de sangre en la nutrición de cultivos hasta la fecha es limitada. Se evaluó los efectos de cinco dosis de harina de sangre (0, 6.5, 13.0, 19.5 y 26.0 g) en el medio de crecimiento, con y sin la presencia de bacterias nitrificantes, sobre propiedades químicas del sustrato, contenido nutrimental y rendimiento de fruto de Capsicum annum L. La concentración de NO3- en el medio crecimiento aumentó al incrementar la dosis de harina de sangre, independientemente del nivel de bacteria nitrificante. El pH aumentó al incrementar la dosis de harina de sangre con bacterias nitrificantes, pero sin adicionar bacterias el pH fue menor. La concentración de Ca, K y la CE del medio de crecimiento decreció al aumentar la dosis de harina de sangre con la adición de bacterias nitrificantes, pero sin bacterias la concentración de éstos se mantuvo constante. El contenido de N y K en el tejido vegetal se redujo al aumentar la dosis de harina de sangre, independientemente del nivel de bacteria nitrificante. El contenido de Ca y Mg, al adicionar bacteria nitrificante se redujo con el aumento la dosis de harina de sangre, pero al no adicionar bacterias, el contenido de Ca fue mayor con 19.5 g de harina de sangre, mientras que de Mg fue con 0 y 19.5 g de harina de sangre. El peso promedio de fruto fue mayor al aplicar 6.5, 13.0 y 19.5 g de harina de sangre sin la adición de bacterias, pero al adicionarla este parámetro fue mayor con 6.5 y 19.5 g de harina de sangre. Por otra parte, el rendimiento fue mayor al adicionar 6.5 g de harina de sangre sin aplicar bacterias, pero al adicionarla el rendimiento fue superior sin harina de sangre""The current knowledge on the influence of blood meal in crop nutrition is rather limited. We studied the effects of five different blood meal rates (0, 6.5, 13.0, 19.5 y 26.0 g) added to the cultural medium, with and without the presence of nitrifying bacteria. We assessed the chemical properties of the substrate, the nutritional
content and the fruit yield of Capsicum annum L. The concentration of NO3- in the cultural medium increased as the rate of blood meal increased, regardless the levels of nitrifying bacteria. The pH increased as the rates of blood meal with nitrifying bacteria increased. The pH was lower without the addition of nitrifying bacteria. Ca, K and EC in the cultural medium decreased as the rate of blood meal with nitrifying bacteria increased, but their concentration remained consistent without nitrifying bacteria. The content of N and K in plant tissue dropped, as the rates of blood meal increased, regardless the level of nitrifying bacteria. With the addition of nitrifying bacteria, Ca and Mg decreased, when the rates of blood meal increased. Without bacteria, Ca was higher at 19.5 g of blood meal; while Mg was higher with the rates of 0 and 19.5 g. Average fruit weight was higher when we applied blood meal at 6.5, 13.0 and 19.5 g, without bacteria. When we added bacteria, this parameter was higher with 6.5 and 19.5 g blood meal rates. On the other hand, the yield was higher when we added 6.5 g of blood meal, without bacteria. When we added bacteria, the yield was higher, without blood meal
Estudio y habilitación del sistema de adquisición de datos-registrador secuencial de eventos en la central hidroeléctrica 15 de noviembre
No full textLa Central Hidroeléctrica 15 de Septiembre con sus 180 MVA de potencia nominal resulta ser la mayor central generadora de energía en el país. Construida sobre el cause del Río Lempa en el Cantón San Lorenzo del departamento de Usulutan a inicios de la década de los ochenta, se ha convertido en un elemento importante en el desarrollo del país. El sistema completo en esta Central Hidroeléctrica fue armado con tecnología procedente de varios países industrializados, entre ellos Japón y Alemania. Para el control de las turbinas, generadores y gobernadores se emplearon métodos de vanguardia que incluyen el control con microprocesadores dedicado y sistemas modulares expansibles a base de tarjetas, precursores directos de los modernos PLC. En este ambiente se encuentra el registrador de eventos secuenciales, sistema desarrollado por Rocheester instrument system que fue adquirido para uso en la central hidroeléctrica en el año 1983. El presente trabajo comprende el estudio de este complejo sistema electrónico-digital de adquisición y almacenamiento de datos e incluye la habilitación completa del sistema y la elaboración de un documento que sirva de manual de operación en beneficio de sus técnicos operadore
Detective fiction in Cuban society and culture.
No full textPhDThe object of this thesis is to reach towards an understanding of Cuban society through a
study of its detective fiction and more particularly contemporary Cuban society through
the novels of the author and critic, Leonardo Padura Fuentes.
The method has been to trace the development of Cuban detective writing and to
read Padura Fuentes in the light of the work of twentieth century Western European
literary critics and philosophers including Raymond Williams, Antonio Gramsci, Terry
Eagleton, Roland Barthes, Jean Paul Sartre, Michel Foucault, Jean François Lyotard and
Jean Baudrillard in order to gain a better understanding of the social and historical
context from which this genre emerged.
By concentrating on the literary texts, I have explored readings which lead out into
an analysis of the broader philosophical, political and historical issues raised by the
Cuban revolution. Since it deals primarily with modes of deviance and notions of legality
and justice within the context of the modern state, detective fiction is particularly well
suited to this type of investigation. The intention is to show how this is as valid in the
Cuban context as it is in advanced capitalist societies where such research has already
been carried out with some success.
The thesis comprises an introduction, ten chapters and a conclusion. The chapters
are divided into three sections. Chapters 1 to 3 attempt a broad theoretical, historical and
socio-political analysis of the cultural reality within which the Cuban revolutionary
detective genre emerged. Chapters 4 to 6 analyse the Cuban detective narrative from its
inception in the early part of the twentieth century until the emergence of Leonardo
Padura Fuentes as the foremost exponent of the genre in Cuba after 1991. Chapters 7-
10 concentrate upon the work of Leonardo Padura Fuentes, offering a reading of his
detective tetralogy informed by the preceding discussion.
The contribution made by the thesis to knowledge of the subject is to build upon the
work of Seymour Menton and Amelia S. Simpson on the development of the Cuban
detective novel and to provide analyses of the pre-Revolutionary Cuban detective
narrative and the work of Leonardo Padura Fuentes for the first time in the English
language. The thesis concludes that the study of this popular genre in Cuba is of crucial
importance to the scholar who wishes to reach as full an understanding of the social
dynamics within that society as possible. In particular, it proves that Cuban detective
fiction provides a useful barometer of social change which records the shifts in the Cuban
Zeitgeist that have taken place over the past century
Validación transcultural para Colombia del cuestionario Estport: una percepción de la carrera dual de estudiantes universitarios - deportistas de alto nivel
No full textEl objetivo de este trabajo es validar el contenido del cuestionario ESTPORT, diseñado para medir la percepción de estudiantes universitarios deportistas de alto nivel sobre carrera dual en Colombia. La carrera dual implica la conciliación entre la carrera deportiva y académica, pero enfrenta barreras significativas que pueden llevar al abandono de los estudios.
El marco teórico se centra en la validación de instrumentos de evaluación y percepción, con base en teorías y estudios previos de autores como Sánchez Pato et al. (2016), que exploran las motivaciones y efectos de la carrera dual en contextos académicos y deportivos.
La metodología incluye el diseño de investigación, métodos de validación del cuestionario ESTPORT y la determinación de dimensiones y ítems relevantes para medir la percepción de los estudiantes universitarios deportistas sobre la carrera dual en Colombia. El grupo de expertos desempeñó un papel crucial en la revisión crítica del cuestionario ESTPORT, proporcionando retroalimentación constructiva, evaluando su adecuación cultural, y asegurando un nivel de fiabilidad adecuado para las variables evaluadas. Esta validación resultó en calificaciones de buen a excelente en la fiabilidad del instrumento.
Los resultados obtenidos a través del proceso metodológico muestran las percepciones y desafíos identificados por los estudiantes universitarios deportistas. Se discuten las implicaciones de estos resultados y se proponen recomendaciones para apoyar la implementación efectiva de programas de carrera dual en el contexto colombiano.
Las conclusiones destacan la importancia de apoyar adecuadamente a los estudiantes universitarios deportistas en su carrera dual, proporcionando recursos y servicios que aborden las barreras identificadas y promuevan el éxito académico y deportivo. Se recomienda expandir la oferta de programas de carrera dual y mejorar el acompañamiento y apoyo a los estudiantes universitarios deportistas para maximizar los beneficios personales y académicos derivados de su participación en el deporte universitario. La implementación de estos procesos metodológicos no solo aseguró la validez y fiabilidad del cuestionario ESTPORT, sino que también destacó la importancia de adaptar los instrumentos de investigación al contexto cultural específico, garantizando así resultados precisos y aplicables en estudios futuros sobre la carrera dual en el ámbito deportivo universitario en Colombia.The objective of this work is to validate the content of the ESTPORT questionnaire, designed to measure the perception of high level university student athletes about dual careers in Colombia. The dual career involves the reconciliation between sports and academic careers, but faces significant barriers that can lead to the abandonment of studies.
The theoretical framework focuses on the validation of assessment and perception instruments, based on theories and previous studies by authors such as Sánchez Pato et al. (2016) that explore the motivations and effects of dual careers in academic and sport contexts.
The methodology includes the research design, the validation methods of the ESTPORT questionnaire, and the determination of relevant dimensions and items to measure the perceptions of university student athletes about dual career in Colombia. The expert group played a crucial role in critically reviewing the ESTPORT questionnaire, providing constructive feedback, assessing its cultural appropriateness, and ensuring an adequate level of reliability for the variables assessed. This validation resulted in good to excellent reliability ratings for the instrument.
The results obtained through the methodological process show the perceptions and challenges identified by university student athletes. The implications of these findings are discussed and recommendations are proposed to support the effective implementation of dual career programs in the Colombian context.
The findings highlight the importance of adequately supporting college student-athletes in their dual career by providing resources and services that address identified barriers and promote academic and athletic success. It is recommended that dual career program offerings be expanded and that mentoring and support for student-athletes be improved in order to maximize the personal and academic benefits derived from their participation in collegiate sport. The implementation of these methodological processes not only ensured the validity and reliability of the ESTPORT questionnaire, but also highlighted the importance of adapting research instruments to the specific cultural context, thus guaranteeing accurate and applicable results in future studies on dual career in the university sport environment in Colombia.Incluye bibliografíaMaestríaMagister en Ciencias del Deport
Modeling, Design and Control of Multiple Low-Cost Robotic Ground Vehicles
No full textabstract: Toward the ambitious long-term goal of a fleet of cooperating Flexible Autonomous Machines operating in an uncertain Environment (FAME), this thesis addresses several
critical modeling, design and control objectives for ground vehicles. One central objective was to show how off-the-shelf (low-cost) remote-control (RC) “toy” vehicles can be converted into intelligent multi-capability robotic-platforms for conducting FAME research. This is shown for two vehicle classes: (1) six differential-drive (DD) RC vehicles called Thunder Tumbler (DDTT) and (2) one rear-wheel drive (RWD) RC car called Ford F-150 (1:14 scale). Each DDTT-vehicle was augmented to provide a substantive suite of capabilities as summarized below (It should be noted, however, that only one DDTT-vehicle was augmented with an inertial measurement unit (IMU) and 2.4 GHz RC capability): (1) magnetic wheel-encoders/IMU for(dead-reckoning-based) inner-loop speed-control and outer-loop position-directional-control, (2) Arduino Uno microcontroller-board for encoder-based inner-loop speed-control and encoder-IMU-ultrasound-based outer-loop cruise-position-directional-separation-control, (3) Arduino motor-shield for inner-loop motor-speed-control, (4)Raspberry Pi II computer-board for demanding outer-loop vision-based cruise- position-directional-control, (5) Raspberry Pi 5MP camera for outer-loop cruise-position-directional-control (exploiting WiFi to send video back to laptop), (6) forward-pointing ultrasonic distance/rangefinder sensor for outer-loop separation-control, and (7) 2.4 GHz spread-spectrum RC capability to replace original 27/49 MHz RC. Each “enhanced”/ augmented DDTT-vehicle costs less than 175 but offers the capability of commercially available vehicles costing over 500. Both the Arduino and Raspberry are low-cost, well-supported (software wise) and easy-to-use. For the vehicle classes considered (i.e. DD, RWD), both kinematic and dynamical (planar xy) models are examined. Suitable nonlinear/linear-models are used to develop inner/outer-loopcontrol laws.
All demonstrations presented involve enhanced DDTT-vehicles; one the F-150; one a quadrotor. The following summarizes key hardware demonstrations: (1) cruise-control along line, (2) position-control along line (3) position-control along curve (4) planar (xy) Cartesian stabilization, (5) cruise-control along jagged line/curve, (6) vehicle-target spacing-control, (7) multi-robot spacing-control along line/curve, (8) tracking slowly-moving remote-controlled quadrotor, (9) avoiding obstacle while moving toward target, (10) RC F-150 followed by DDTT-vehicle. Hardware data/video is compared with, and corroborated by, model-based simulations. In short, many capabilities that are critical for reaching the longer-term FAME goal are demonstrated.Dissertation/ThesisMasters Thesis Electrical Engineering 201
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