Minimal surfaces

The focus of this project consists of investigating when a ruled surface is a minimal surface. A minimal surface is a surface with zero mean curvature. In this project the basic terminology of differential geometry will be discussed including examples where the terminology will be applied to the different subjects of differential geometry. In addition the focus will be on a classical theorem of minimal surfaces referred to as the Plateau\u27s Problem

An interval fuzzy model for magnetic monitoring: estimation of a pollution index

In this contribution, a methodology is reported in order to build an interval fuzzy model for the pollution index PLI (a composite index using relevant heavy metal concentration) with magnetic parameters as input variables. In general, modelling based on fuzzy set theory is designed to mimic how the human brain tends to classify imprecise information or data. The ??interval fuzzy model?? reported here, based on fuzzy logic and arithmetic of fuzzy numbers, calculates an ??estimation interval?? and seems to be an adequate mathematical tool for this nonlinear problem. For this model, fuzzy c-means clustering is used to partition data, hence the membership functions and rules are built. In addition, interval arithmetic is used to obtain the fuzzy intervals. The studied sets are different examples of pollution by different anthropogenic sources, in two different study areas: (a) soil samples collected in Antarctica and (b) road-deposited sediments collected in Argentina. The datasets comprise magnetic and chemical variables, and for both cases, relevant variables were selected: magnetic concentration-dependent variables, magnetic features-dependent variables and one chemical variable. The model output gives an estimation interval; its width depends on the data density, for the measured values. The results show not only satisfactory agreement between the estimation interval and data, but also provide valued information from the rules analysis that allows understanding the magnetic behaviour of the studied variables under different conditions.Fil: Chaparro, Mauro Alejandro Eduardo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto Multidisciplinario de Ecosistemas y Desarrollo Sustentable; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; ArgentinaFil: Chaparro, Marcos Adrián Eduardo. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; ArgentinaFil: Sinito, Ana Maria. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Exactas. Instituto de Física Arroyo Seco; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil; Argentin

Water, vapour and heat transport in concrete cells for storing radioactive waste

Water is collected from a drain situated at the centre of a concrete cell that stores radioactive waste at ‘El Cabril’, which is the low and intermediate level radioactive waste disposal facility of Spain. This indicates flow of water within the cell. 2D numerical models have been made in order to reproduce and understand the processes that take place inside the cell. Temperature and relative humidity measured by sensors in the cells and thermo-hydraulic parameters from laboratory test have been used. Results show that this phenomenon is caused by capillary rise from the phreatic level, evaporation and condensation within the cell produced by temperature gradients caused by seasonal temperature fluctuations outside. At the centre of the cell, flow of gas and convection also play a role. Three remedial actions have been studied that may avoid the leakage of water from the drain.Peer ReviewedPostprint (author's final draft

The construction of a Memory Space in a Former Clandestine Center for Detention, Torture and Disappearance of people in Olavarría (Argentina)

El Terrorismo de Estado fue un proceso que afectó a la mayoría de los pueblos de América Latina, ya hace varias décadas pero, como todo proceso genocida, sus consecuencias y sus marcas siguen vigentes. En Argentina, los procesos de reparación y de justicia contra los delitos de lesa humanidad generaron múltiples acciones, entre las más destacadas se encuentran los juicios y la conformación de sitios de memoria. En las últimas décadas se han creado numerosos de estos espacios a lo largo del país, en muchos de los cuales la arqueología ha jugado un rol significativo en su constitución. Este artículo explica el proceso de activación patrimonial de uno de ellos, el Espacio de Memoria Monte Pelloni, su significación y valoración social, la participación ciudadana y los retos que se debieron asumir en cuanto al rol como profesional de la arqueología.State terrorism was a process that affected most Latin American people several decades ago, although, as with all genocidal processes, its consequences and impact can still be felt. In Argentina, the processes of reparation and justice in cases of crimes against humanity generated multiple actions, among which the most important has been the creation of memory sites. Several such spaces have been created in recent decades throughout the country, with archeology often playing a significant part. This article explains the process of activating heritage in one case, that of the Monte Pelloni memory space, as well as its significance and social value, citizen participation, and the challenges that had to be faced in terms of the role of the archaeologist as a professional.Fil: Chaparro, Maria Gabriela. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Tandil. Investigaciones Arqueológicas y Paleontológicas del Cuaternario Pampeano. Universidad Nacional del Centro de la Provincia de Buenos Aires. Investigaciones Arqueológicas y Paleontológicas del Cuaternario Pampeano; Argentin

Examination of the Impact of Various Training Approaches on Different UAS Operator Populations

In recent years, the UAS industry has extended beyond military and recreational use and is now positioned to become a major portion of the aviation industry. As we move toward UAS integration into the national airspace system, UAS operators need effective training to ensure safe operation. Training UAS operators in an engaging way is important to ensure the best performance and transfer of training. Training methods that elicit high levels of learner engagement have been shown to improve knowledge gains, performance, and therefore such training techniques provide an opportunity for improving UAS training effectiveness and transfer. The growth of the UAS industry across various domains such as first responders and industrial inspectors has resulted in a broad demographic of end users. Given this, training may need to be tailored based on the population to ensure an engaging experience. To examine this topic, a study was conducted in which UAS pilots from the student population and first responder population participated in UAS training to test the effect of different training approaches on learner engagement of different end user populations. Participants engaged in instructional videos, simulation challenges, and live obstacle courses and were measured on their engagement levels and performance. This presentation will describe the methods and findings associated with the study along with implications for the aviation industry

Modelling of multiphase flow in evaporation tests in concrete columns

Postprint (published version

Los Estudios de Público Escolar y la Comunicación de la Arqueología

En este trabajo se analizan los intereses, hábitos y valoraciones del público escolar asistente a la exposición "Olavarría antes de Olavarría" realizada por un grupo de investigación. Esta clase de estudios, en general utilizada por museos, permite evaluar y (re)formular las prácticas de comunicación de la arqueología. Para ello se empleó una metodología cuali-cuantitativa y las variables seleccionadas fueron de tipo social, de opinión y valorativas, para lo que se requirió de encuestas, entrevistas, observaciones y registros durante las visitas guiadas de las escuelas. Entre los resultados más importantes del estudio se puede mencionar la buena recepción de la propuesta por parte de ambos grupos, con la diferencia que el público adolescente es más crítico y exigente. Por su parte los/as docentes señalan dos aspectos positivos de la exhibición, primero su utilización como estrategia didáctica disparadora para continuar en el trabajo áulico y en segundo lugar, la posibilidad de interiorizarse sobre conocimientos que no estaban accesibles. Por otro lado, esta exposición, al ser entendida en su rol educativo, social y comunicacional, también fue analizada dentro del marco de la llamada evaluación de exposiciones y este análisis permitió remarcar sus aspectos positivos y algunas cuestiones que tuvieron que modificarse durante su marcha. Finalmente, se considera importante generar propuestas al amplio público como compromiso universitario de devolución social, sin embargo, no dejan de ser activaciones patrimoniales dirigidas que no implican necesariamente apropiación y/o valoración comunitaria.In this paper we analyze the interests, habits and ratings of schoolchildren attending the exhibition "Olavarría antes de Olavarría" made by a research group. Such studies, typically used by museums, serve to evaluate and (re)develop communication practices of archaeology. A qualitative- quantitative methodology was used and the selected variables included those of social order, opinions and values. This required of surveys, interviews, observations and records during guided tours of the schools. Among the most important results of the study it can be mentioned the good reception of the proposal by both teachers and student groups, except for the teen audience that is more critical and demanding. For their part, the teachers indicate two positive aspects of the exhibition, first its use as a triggering teaching strategy to continue classroom work and, secondly, its ability to internalize knowledge that were not accessible. On the other hand, as this exhibit is understood on its educational social and communicational role, it was also analyzed within the framework of the so-called exhibit assessment which allowed to emphasize their strengths and highlight some issues that had to be modified on the march. Finally, we consider it is important to generate proposals to the general public as a commitment of the University to social return, however, they are still targeted heritage activations that do not necessarily imply ownership and/or community assessment.Fil: Chaparro, Maria Gabriela. Consejo Nacional de Invest.cientif.y Tecnicas. Ctro Cientifico Tecnologico . CONICET - Tandil. Investigaciones Arqueológicas y Paleontológicas del Cuaternario Pampeano; Argentina;Fil: Borgo, Mariangeles. Consejo Nacional de Invest.cientif.y Tecnicas. Ctro Cientifico Tecnologico - CONICET- Tandil. Investigaciones Arqueologicas y Paleontologicas del Cuaternario Pampeano; Argentina;Fil: Degele, Pamela Esther. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Sociales. Departamento de Arqueologia; Argentina;Fil: Vergara, Dana. Universidad Nacional del Centro de la Provincia de Buenos Aires. Facultad de Ciencias Sociales. Departamento de Arqueologia; Argentina

Advanced Air Mobility Human factors Considerations for Current eVTOL Pilot Interfaces

Advanced air mobility (AAM) is a novel transportation concept using electric vertical take-off and landing (eVTOL) aircraft to move people and cargo in urban and rural environments. The emergence of AAM has led to a range of different eVTOL vehicle designs at different stages in development, flight testing, and certification. Although these aircraft will serve similar markets, they will have different operational capabilities and pilot interfaces. These aircraft vary in whether they are (a) multi-rotor and have tilt-rotor capabilities, or (b) winged with tilt-wing capabilities, vectored thrust, fans, or propellers. The pilot interfaces in eVTOL align with the concept of simplified vehicle operations (SVO), which emphasizes the use of automation to simplify the physical control a pilot has on the aircraft, effectively reducing workload. Pilot interfaces range in their level of landing precision information, the number of displays, checklist presentation, and how battery information is presented. A preliminary survey was conducted to determine common trends in eVTOL pilot interfaces. Common trends identified include large displays, integration of flight information such as speed, altitude, heading, climb and descent rate, flight path, battery power information, origin and destination of the flight, weather information, aircraft range and location, tilt information, and rotation per minute (RPM). This presentation will investigate trends in the eVTOL pilot interfaces and the associated human factors issues that may arise due to these interfaces. Additionally, simulation testbeds available to examine the human factors issues associated with these pilot interfaces will be presented

Reactive transport modelling of cement-groundwater-rock interaction at the Grimsel Test Site

An in situ experiment at the Grimsel Test Site (Switzerland) to study water-cement-rock interaction in fractured granite was modelled. It consisted of a hardened cement source in a borehole intersecting a water conducting fracture. Grimsel groundwater was injected into this borehole. Two other boreholes at about 0.56 m and 1.12 m from the emplacement borehole were used to monitor the evolution of water composition for 5 years. The modelling approach was based on a 1D radial model for the emplacement borehole and a small volume of rock (fault gouge) around it, and a 2D model for the rest of the domain. The results of the 1D model were used as input for the 2D model. Both models showed dissolution of the fault gouge minerals. Results from the 1D model showed dissolution of portlandite in the cement with an increase in porosity. The 2D model showed a reduction in porosity in the fault gouge due to mineral precipitation. Near the emplacement borehole ettringite precipitated. At the centre of the plume there was precipitation of C-A-S-H and hydrotalcite. At the edge of the hyperalkaline plume calcite, hydrotalcite and illite precipitated.Peer ReviewedPostprint (author's final draft

Situación actual del programa Chile crece contigo en la séptima región del Maule: descripción de las modalidades de atención, los equipos de trabajo y la caracterización del desarrollo psicomotor de los niños y niñas

92 p.Introducción: El desarrollo humano comienza desde la concepción y es fundamental su adecuada estimulación a lo largo de todo el ciclo vital (Oates, 2012). La implementación de programas para el desarrollo infantil temprano se ha instaurado en muchos países (Engle, 2007), y en Chile se encuentra el programa Chile Crece Contigo, donde participan actores sociales que, junto a diversos factores, influyen directa o indirectamente en el desarrollo de los niños. A partir de esto, nace la inquietud de conocer cuál es la situación actual de este programa en la región del Maule, las modalidades de atención, quiénes lo componen y la categorización del desarrollo psicomotor de los niños y niñas de nuestra región. Objetivo: Describir las características de los equipos y caracterización del desarrollo psicomotor de los niños y niñas en el programa Chile Crece Contigo en la VII región del Maule. Metodología: Estudio descriptivo del análisis de datos de las modalidades de atención, profesionales trabajando en ellas, número de niños atendidos y su categorización según EEDP de las planillas MADI y REM A03 de la región del Maule. Resultados: 90% de las salas en la región corresponde a SE y 10% a SI. 92% está a cargo de Educadoras de Párvulo. El kinesiólogo está presente en el 25% de las salas. 91% de los niños/as están en SE y 9% en SI. Respecto a su categorización, 90% del total de niños/as tiene un desarrollo psicomotor normal, 5% normal con rezago, 4% riesgo, y 1% retraso. Conclusión: En el programa Chile Crece Contigo existen dos modalidades de atención: las SE y SI. La cantidad de salas SI es escasa para la región, tomando en consideración el índice de ruralidad de ésta. Existe un bajo porcentaje de kinesiólogos que participan en salas del programa Chile Crece Contigo de la VII región del Maule. La realidad regional de los niños con alteración en el desarrollo psicomotor tiene un comportamiento similar a la de la realidad nacional. En el rango de 18 a 47 meses se encuentra el mayor porcentaje de niños con problemas en el desarrollo psicomotor.Palabras clave: Brain plasticity, neuronal plasticity, early child development, early child stimulation, Chile Crece Contig