High Resolution Viscosity Measurement by Thermal Noise Detection

An interferometric method is implemented in order to accurately assess the thermal fluctuations of a micro-cantilever sensor in liquid environments. The power spectrum density (PSD) of thermal fluctuations together with Sader's model of the cantilever allow for the indirect measurement of the liquid viscosity with good accuracy. The good quality of the deflection signal and the characteristic low noise of the instrument allow for the detection and corrections of drawbacks due to both the cantilever shape irregularities and the uncertainties on the position of the laser spot at the fluctuating end of the cantilever. Variation of viscosity below 0.03 mPa$\cdot$s was detected with the alternative to achieve measurements with a volume as low as 50 $\mu$L.Comment: Sensors, MDPI, 201

Action research project en gerencia de la innovación en IGUÁ

74 páginasEl Café en Colombia es uno de los mayores productos de exportación que tiene el país. Con el pasar de los tiempos, el modelo de producción de la caficultura colombiana se ha ido transformando de grandes extensiones a pequeñas parcelas de cafés especiales, donde los caficultores están más empoderados y comprometidos. Actualmente, el Centro Nacional de Investigación de Café (CENICAFE) ha desarrollado dos variedades certificadas (Castillo® y Cenicafe 1) para así garantizar una caficultura rentable, sostenible y de calidad. Estas semillas únicamente se pueden adquirir por medio de la Federación Nacional de Cafeteros y es ahí, donde Iguá un Vivero de plantas de Café Certificadas y único con registro ICA, entra a jugar un papel fundamental para el desarrollo de la caficultura del municipio de San Francisco y sus alrededores. Por esta razón, y por medio de la ejecución de un diagnóstico completo de innovación al interior de Iguá, se busca establecer que oportunidades de mejora se pueden transformar a nivel de liderazgo creativo y que modelo de Innovación se puede implementar y desarrollar al interior de la compañía para generar valor agregado no solo a la empresa sino a sus Stakeholders (clientes, proveedores, aliados y empleados).Coffee in Colombia is one of the largest and more important export products that the country has. With the passing of time, the Colombian coffee production model, has been transformed from large extensions to small plots of specialty coffees, where coffee growers are more empowered and committed. Currently, the Centro Nacional de Investigación de Café (CENICAFE) has developed two certified varieties (Castillo®️ and Cenicafe 1) in order to guarantee profitable, sustainable and good quality coffee growing. These seeds can only be acquired through the Federación Nacional de Cafeteros. From there, Igua, which is a Nursery of Certified Coffee plants and the only one with ICA registration, comes to play a fundamental role in the development of coffee growing in the municipality of San Francisco and its surroundings. For this reason and through the execution of a complete diagnosis of innovation within Igua. It seeks to establish which opportunities for improvement can be transformed at the level of creative leadership, and which innovation model can be implemented and developed within the company. This will generate added value not only for the company, but also for its stakeholders (customers, suppliers, allies and employees)Maestría en Gerencia de la InnovaciónMagíster en Gerencia de la Innovació

UAVouch : a distributed drone identity and location validation mechanism

As aplicações emergentes de vigilância, com equipes de VANTs, dependem de comunicação segura para trocar informações, coordenar seus movimentos e cumprir os objetivos da missão. Proteger a rede identificando o acesso de nós mal-intencionados tentando perturbar o sistema é uma tarefa importante, e particularmente sensível no domínio militar. Observando essa necessidade, este artigo apresenta o design e a avaliação do UAVouch: Um esquema distribuído de validação de localização e identidade de drones que combina uma autenticação baseada em chave pública com uma verificação de plausibilidade de movimento para grupos de VANTs. A ideia principal do UAVouch complementa o mecanismo de autenticação, verificando periodicamente a plausibilidade da localização dos VANTs vizinhos, permitindo a detecção de intrusos que não conseguem seguir as trajetórias esperadas. A solução proposta foi avaliada em simulação através de um cenário de vigilância militar, no qual detectou-se ataques de falsificação de posição de nós mal-intencionados com precisão em média acima de 85%.Emerging surveillance applications of UAV teams rely on secure communication to exchange information, coordinate their movements, and fulfill mission objectives. Protecting the network by identifying malicious nodes access trying to disturb the system is an important task, which is particularly sensitive in the military domain. Observing this need, this paper presents the design and evaluation of UAVouch: an identity and location validation scheme combining a public-key based authentication with a movement plausibility check for groups of UAVs. The key idea of UAVouch supplement the authentication mechanism by periodically checking the plausibility of the location of neighboring UAVs, allowing the detection of intruders that are unable to follow expected trajectories. The proposed solution was evaluated in a simulated military surveillance scenario in which it detects malicious nodes’ position falsification attacks with an accuracy on average above 85%

PERFORMANCE OF BRAZILIAN BUSINESS, ACCOUNTING AND TOURISM GRADUATE PROGRAMS

The Brazilian institution in charge of graduate programs (CAPES) evaluates all programs every three years, focusing on publications in scientific periodicals, which are classified by the Qualis – CAPES system. This study aims to measure the relative efficiency of post-graduate programs in Business, Accounting and Tourism through Data Envelopment Analysis (DEA) and to measure the change in productivity from the three-year period of 2004-2006 to the 2007-2009 period by the Malmquist Index. Efficiencies of some graduate programs in Brazil using DEA have been evaluated but the Malmquist Index was not used because the 2007-2009 data was only recently available. They also used different input and output variables and did not consider, in our view, the real importance CAPES attributes to publications. We used, as inputs, professors, dissertations and thesis and, as outputs, total points obtained from the Qualis classification of periodicals. Among the results: the efficiency increased from the first to the second period; the efficiency of public institutions was higher as was the efficiency of programs with PhD courses and of programs more than 12 years old; the Malmquist index increased from one triennium to another

Four Analyses on the Official Letters of Rio Grande do Norte (Brazil)

Between variation and change, as we know, not only language, but also the texts, with their structures, undergo changes over time. This article aims to analyze textual changes observed in letters of the 18th, 19th and 20th centuries. These documents are part of the corpus called Cartas oficiais norte-rio-grandenses (Rio Grande do Norte official letters) combined to the regional project called História do Português Brasileiro no Rio Grande do Norte (PHPB-RN) and the national project História do Português Brasileiro (PHPB). Four analyses were made from these letters, built upon the ideas of Coseriu and on the studies about discourse tradition (Koch 1997, Kabatek 2006), according to which texts are shaped to follow their own tradition (Coseriu 2007). After that, we focus on the letter and the letter of registration genres and their macro-structures as well as on the clausula (valediction) and the application expressions micro-structures. This analysis shows some processes of variation and change which these official letters underwent, besides how textual dynamics can indicate social change

Diseño e implementación de un ambiente híbrido de aprendizaje de las matemáticas para estudiantes de grado cuarto de la jornada de la tarde del Colegio Chiloé de Soacha – Cundinamarca.

En este documento se presentan los elementos que dan cuenta de la investigación desarrollada desde la modalidad de proyecto aplicado, la cual se desarrolló en la Institución Educativa Chiloé ubicada en el municipio de Soacha, departamento de Cundinamarca – Colombia con el grupo objeto de estudio identificado como estudiantes del grado cuarto de la jornada tarde, con el propósito de favorecer los aprendizajes del componente numérico a partir del diseño y la implementación de un ambiente híbrido, soportado en la plataforma Google Classroom, herramienta que posibilitó la creación de un ambiente virtual de aprendizaje (AVA) como complemento a la orientación que se le brindaba a los estudiantes en el aula presencial. Esta investigación se desarrolló por medio de un enfoque cualitativo desde el método de investigación acción participativa y se estructuró mediante las siguientes cuatro fases propuestas por Monje (2011): Primera fase (preparatoria): dividida en dos etapas, en la primera de ellas denominada reflexiva en la cual se establecieron los parámetros de partida para desarrollar la investigación, desde donde se realizó un rastreo documental de la información en el cual se identificaron las investigaciones que se elaboraron previamente con el fin de reconocer aquellos elementos que no fueron explorados y que a través de esta investigación se aportará, la segunda etapa de esta fase consistió en el diseño del ambiente híbrido desde los elementos conceptuales y teóricos desarrollados; Segunda fase (trabajo de campo): se desarrolló interviniendo la población objeto de estudio mediante la implementación del ambiente híbrido, y se llevó a cabo una recolección de datos productiva a través de la técnica de observación participante, utilizando instrumentos como entrevistas semiestructuradas con el docente de matemáticas de cuarto grado para identificar necesidades de aprendizaje en el componente numérico, registro de datos en entornos virtuales en Google Classroom en donde interactuaron los estudiantes, y notas de campo en las cuales se registraron los elementos más relevantes observados durante la interacción con la población estudiantil; Tercera fase (analítica): en donde se realizó una evaluación de los resultados obtenidos los cuales finalmente se plasmaron en este informe final el cual se ha logrado en la Cuarta fase (informativa): correspondiente presentación del informe final de investigación.This document presents the elements that account for the research carried out through the applied project modality, which was developed at the Chiloé Educational Institution located in the municipality of Soacha, Cundinamarca department - Colombia, with the target group identified as fourth-grade students in the afternoon session. The purpose of the research was to enhance numerical learning through the design and implementation of a hybrid environment supported by the Google Classroom platform. This tool enabled the creation of a virtual learning environment (VLE) as a complement to the guidance provided to students in the physical classroom. This research was conducted using a qualitative approach within the framework of participatory action research and was structured according to the four phases proposed by Monje (2011). The first phase (preparatory) was divided into two stages. The first stage, called the reflective stage, established the starting parameters for the research. A documentary search was conducted to identify previous studies and explore elements that had not been examined yet and would be addressed in this research. The second stage of this phase involved the design of the hybrid environment based on the developed conceptual and theoretical elements. The second phase (fieldwork) involved intervening with the target population by implementing the hybrid environment. Data collection was carried out through the productive technique of participant observation, utilizing instruments such as semi-structured interviews with the fourth-grade mathematics teacher to identify learning needs in the numerical component. Data was also collected through interactions with students in the virtual environment of Google Classroom, and field notes were taken to record the most relevant elements observed during interactions with the student population. The third phase (analytical) involved evaluating the results obtained, which are finally reflected in this final report. The fourth phase (informative) corresponds to the presentation of the final research report

Propuesta pedagógica mediada por AVA para desarrollar procesos de autoaprendizaje en estudiantes de grado octavo en sistemas de ecuaciones lineales de primer grado con dos incógnitas del Instituto Clara Fey Bogotá

En este documento se presenta una propuesta de investigación que nace desde la identificación de las necesidades de aprendizaje en el área de matemáticas de grado octavo en el Instituto Clara Fey, en donde se evidencio que las estudiantes de este grado presentaban algunas dificultades en el aprendizaje de sistemas de ecuaciones de primer grado con dos incógnitas. Por consiguiente, fue necesario articular este proyecto en cuatro fases de acción las cuales se dividen de la siguiente manera: Fase 1 identificación de las necesidades de aprendizaje; Fase 2 elaboración de un plan de acción; Fase 3 ejecución del plan de acción y la Fase 4 consistió en la sistematización de la información. Dadas las particularidades del proyecto aplicado la investigación se aterrizó sobre la línea de investigación pedagogía didáctica y currículo en la cual uno de sus fundamentos se orienta sobre la visibilización del aprendizaje autónomo desde la pedagogía tradicional hacia las prácticas pedagógicas en ambientes virtuales de aprendizaje, a parte de ello, se focalizó sobre el núcleo problémico aprendizaje autónomo y gestión del conocimiento ya que en este se evidencia como el aprendizaje autónomo requiere el desarrollo de procesos fundamentales relacionados con la reflexión para comprender los problemas y dar solución a estos. Parar ello fue es indispensable sentar las bases teóricas necesarias para dar claridades sobre el aprendizaje autónomo, ambientes virtuales de aprendizaje y métodos de solución para los sistemas de ecuaciones de primer grado con dos incógnitas, así como también los aspectos relevantes para la determinar la metodología de investigación.This document presents a research proposal that arises from the identification of learning needs in the area of ​​eighth grade mathematics at the Clara Fey Institute, where it was evidenced that the students of this grade presented some difficulties in learning systems of first degree equations with two unknowns. Therefore, it was necessary to articulate this project into four action phases, which are divided as follows: Phase 1 identification of learning needs; Phase 2 elaboration of an action plan; Phase 3 execution of the action plan and Phase 4 consisted of the systematization of the information. Given the particularities of the applied project, the research was landed on the line of research pedagogy didactics and curriculum in which one of its foundations is oriented on the visibility of autonomous learning from traditional pedagogy to pedagogical practices in virtual learning environments, apart of this, it focused on the problem nucleus autonomous learning and knowledge management since this shows how autonomous learning requires the development of fundamental processes related to reflection to understand problems and solve them. To stop it, it is essential to lay the necessary theoretical foundations to clarify autonomous learning, virtual learning environments and solution methods for the first-degree equation systems with two unknowns, as well as the relevant aspects for determining the methodology of investigation

Estabilização de solo com adição de cal e cimento para fins de pavimentação na região de Uberlândia

Trabalho de Conclusão de Curso (Graduação)Visando o melhor aproveitamento de solo locais nas obras de engenharia, considerando seu fácil acesso, este trabalho teve o intuito de avaliar os efeitos da adição de cal e cimento em um solo, coletado no Campus Glória da Universidade Federal de Uberlândia, sob a perspectiva de melhorar suas características para ser utilizado em camadas de pavimento como sub-base e base por exemplo. O critério utilizado para avaliar a aplicabilidade do solo estabilizado quimicamente foi o valor de CBR obtido após realização de ensaios em cada uma das amostras, já que esta é a base do método de dimensionamento proposto pelo DNIT atualmente. O solo estudado se trata de um solo argiloso laterítico de acordo com a metodologia MCT. Para estabilização química deste solo, utilizou-se a cal hidratada do tipo CH-1 nos teores de 3%, 5% e 7% e o Cimento Portland IV nos teores de 9%, 11% e 13%. Observaram-se alterações, em relação à amostra de solo natural, na umidade ótima e massa específica seca. Em todos os casos houve aumento nos valores de CBR chegando a melhorias de até 1692% em relação à amostra não estabilizada