822 research outputs found

    Analysis and control co-design optimization of natural gas power plants with carbon capture and thermal energy storage

    Get PDF
    2022 Summer.Includes bibliographical references.In this work, an optimization model was constructed to help address important design and operation questions for a novel system combining natural gas power plants (NGCC) with carbon capture (CC) and hot and cold thermal energy storage (TES) units. The conceptualization of this system is motivated by the expected evolution of the electricity markets towards a carbon-neutral electricity grid heavily penetrated by renewable energy sources, resulting in highly variable electricity prices and demand. In this context, there will be an opportunity for clean, flexible, and cheap fossil fuel-based generators, such as NGCC plants with CC, to complement renewable generation. However, while recent work has demonstrated that high CO2 rates are achievable, challenges due to high capital costs, flexibility limitations, and the parasitic load imposed by CC systems onto NGCC power plants have so far prevented its commercialization. Coupling TES units with CC and NGCC would allow to store thermal energy into the TES units when the electricity prices are low, either by subtracting it from the NGCC or by extracting it from the grid, and to discharge thermal power at peak prices, from the hot storage (HS) to offset the parasitic load of the CC system and from the cold storage (CS) for chilling the inlet of the NGCC combustion turbine and increase the output of the cycle beyond nominal value. For the early-stage engineering studies investigating the feasibility of this novel system, a control co-design (CCD) approach is taken where key plant sizing decisions (including storage capacities and energy transfer rates) and operational control (e.g., when to store and use thermal energy and operate the power plant) are considered in an integrated manner using a simultaneous CCD strategy. The optimal design, as well as the operation of the system, are determined for an entire year (either all-at-once or through a moving prediction horizons strategy) in a large, sparse linear optimization problem. The results demonstrate both the need for optimal operation to enable a fair economic assessment of the proposed system as well as optimal sizing decisions due to sensitivity to a variety of scenarios, including different market conditions, site locations, and technology options. After detailed analysis, the technology shows remarkable promise in that it outperforms NGCC power plants with state-of-the-art CC systems in many of the scenarios evaluated. The best overall TES technology solution relies on cheap excess grid electricity from renewable sources to charge the TES units -- the HS via resistive heating and the CS through an ammonia-based vapor compression cycle. Future enhancements to the optimization model are also discussed, which include additional degrees of freedom to the CC system, adapting the model to evaluate other energy sources and storage technologies, and considering uncertainty in the market signals directly in the optimization model

    De las políticas públicas a las prácticas educativas: la incidencia de la práctica del supervisor escolar

    Get PDF
    El supervisor escolar resulta una de las herramientas del Estado para el control de la ejecución de las reglamentaciones que constituyen las políticas educativas, jugando –en algunos momentos– algún papel en la génesis de las mismas. Esto ubica la posición del supervisor en tensión entre dos configuraciones de fuerzas diferentes: la de la alta función pública educativa y la del ámbito local de supervisión. En ese marco, los supervisores luchan con otros agentes por usufructuar la competencia técnica, socialmente reconocida, de conocer e intervenir en el funcionamiento de los centros escolares y el desarrollo de la política educativa. Este artículo analiza la toma de posición de los supervisores de nivel medio de la provincia de Río Negro ante las políticas educativas del período 1991-2003 y las estrategias que estos desplegaron desde la particular posición que ocupan en el campo educativo.The supervisor is one of the state tools to the control of the execution of the establishment of rules and regulations that constitute the educative policy, playing –sometimes– some role on its beginning. This put the supervisor’s position in tension because It is situated in the intersection of two different force’s configurations, with their own rules each one: the high public-educative function and the local conformation. In this frame, the supervisors fight against other agents to meet the usufruct of the technical competence to know and take part in the performance of the scholastic institutions and in the developing of educative policy. This article analyse which have been the position taken by the Scholastic Supervisor, in the frame of the educative policy of Río Negro province (1991-2003) and the strategies that they developed

    Art in the Park

    Get PDF
    One of the main objectives for our project was finding sustainable paints that could be used in the mural. One of the most influential sources I found was by Rochikashvili & Bongaerts (2016), which discussed three types of sustainable paints used to cover walls, and the benefits of each. This is where I learned about the emission of VOCs, or volatile organic compounds, that are found in many traditional paints and the harmful effects they can have on the environment. The authors of this paper discussed the benefits of finding low-VOC paints, as well as other sustainable paint alternatives like tung-oil and milk paint. Another study by Galvão et. al. (2018) discussed a new type of paint used in an industrial setting that reuses iron ore shavings to create paint pigments

    Representaciones de la monoparentalidad y la diversidad familiar en el ámbito educativo

    Get PDF
    The present article aims to analyze how the pedagogical discourse symbolically constructs single parenthood and family diversity. Some prescriptive texts such as laws, curriculum designs, documents produced by governments and international organizations and educational research’s articles have been analyzed for this purpose. As a result, it is noted that hegemonic school discourse and a certain 'scientific common sense' prescribing and normalizing certain forms of family organization and certain forms of linking families and schools as necessary conditions for children's schooling. Biparentality appears more or less explicitly as the expected family. This results in the invisibilization of single parenting in educational laws, curriculum documents and school manuals and the connotation of family diversity as some deviation from an expected standard, which therefore negatively affects the school task. This preconception, which identifies families with a nuclear family, is stronger in the field of educational and social sciences. It is insisted -beyond the evidence of the research itself- that single parenthood is a risk factor, a new danger for schooling of the children of these families.El presente artículo tiene por objetivo analizar cómo el discurso pedagógico construye simbólicamente la monoparentalidad y la diversidad familiar. Con tal fin se han analizado algunos textos prescriptivos como leyes, diseños curriculares, documentos ministeriales y de organismos internacionales y la producción procedente del campo de la investigación educativa. Como resultado se advierte que el discurso escolar hegemónico y cierto ‘sentido común científico’ coinciden en prescribir y normalizar tanto determinadas formas de organización familiar como ciertas formas de vinculación entre familias y escuelas como condiciones necesarias para la escolarización infantil. La biparentalidad aparece más o menos explícitamente como la familia esperada, supuesta. Esto se traduce en la invisibilización de la monoparentalidad en las leyes educativas, documentos curriculares y manuales escolares y la connotación de la diversidad familiar como cierta desviación de un estándar esperado que por eso afecta negativamente la tarea escolar. Más fuerte resulta esta prenoción que identifica familia con familia nuclear en el campo de las ciencias de la educación y afines: se insiste -más allá de las evidencias de las propias investigaciones- en que la monoparentalidad es un factor de riesgo, nuevo peligro para la escolarización de los hijos de esas familias

    La citt\ue0 di passaggio e il Dilemma del porcospino. Il service design come strumento per la co-progettazione di spazi dedicati ai minori in campi rifugiati

    Get PDF
    Wars, exoduses and infosphere are the three main actors of the deep social and cultural change that is crossing our century. The link between these three phenomena has brought to the stage the trajectories of nomadic and not (geo)localizable populations, generating a new way of living space and affection for places. The geographies of living have changed. The verb "to take root" has been replaced by the verb "to settle" replacing the idea of space appropriation and giving it an ephemeral meaning. The temporary trace of a passage finds its concrete representation in the "city of passage", the refugee city-camp. A city that Man is led to escape in continuum -mentally or via social- because of its ontological dimension. A dimension saturated with words such as exclusion, diversity, marginality; defined by the philosopher Marc Aug\ue8: "non. place". In fact, places are such when the entity space is combined with the time of memory and the desire to preserve a trace. This trace takes shape from an appropriation and a malleability of spatial geometries: an act of building, closely related to the temporal dimension that it determines. In the city of passage this action is absent; this involves a caesura in the act of living. Habitare (from lat. habit\u101re, orig. 'tenere', frequent. of hab\u113re 'to have') in fact refers to the concept of permanence: the continuous and repeated having of a place, not in the sense of possession but in the sense of knowledge and confidence with it. Living becomes an act when the space is worn like a skin, like a dress (the same etymology of inhabiting) that is known. It is in the knowledge and management of this skin that spatial identity is determined. A deep-rooted identity that is not afraid of confrontation with the dimension "other" and "of the other". Can participatory design encourage and facilitate the cultural interchange between inhabitants and context, transforming the physical and social limes into a limen? A threshold that allows the passage to distinct and different cultural identities? Who are the protagonists of this process aimed at creating public value? And what tool can service design use to pursue this objective? The discipline finds an answer to philosopher Arthur Schopenhauer's hedge-hog dilemma through the multimedia co-design of space. The app Hedge-hog - an acronym that means hedgehog in English and that phonetically plays with the word edge: limit - promotes a stimulus to play and creativity through the co-organization and co-management of play and training activities between stakeholders: the minors who live in the camp, the volunteer service operating within it, the minors who live beyond the limit. The network connection between the various transit cities also helps to overcome physical distance and in some camp-cities makes up for the absence of volunteers by streaming the same proposed activities. This process, through the cultural and relational interchange, originates the creation of a present and conscious time, an affection to the place, a memory, the first necessary bricks in the construction of the city of tomorrow

    El primer año de la universidad como analizador institucional

    Get PDF
    Investigaciones recientes indican que en los países del MERCOSUR un 30 % de los estudiantes que inician sus estudios universitarios no registran ninguna actividad académica luego del primer año. La interrogación sobre ese problema, al menos en América Latina, es reciente e incipiente, en el sentido de su potencia problematizadora, no así en los países centrales donde desde hace varias décadas se viene investigando este tema. Por ello esta comunicación tiene por objetivo desarrollar la hipótesis sobre que las vicisitudes que afronta el estudiantado en su experiencia en el primer año en la universidad y las respuestas institucionales ante los altos índices de deserción y desgranamiento, constituyen un analizador institucional para las Universidades, es decir, una oportunidad para pensar la gramática de esa institución, su mircropolítica. A tal fin recurre al análisis de estadísticas educativas, a los aportes de la literatura en la materia y a datos primarios generados a través de encuestas y entrevistas estudiantes ingresantes de la Universidad Nacional de Río Negro. Como resultado da cuenta de las condiciones de emergencia del primer año de la universidad como problema que llama la atención al campo político y académico. Esas condiciones se configuran a partir de cambios cuanti– cualitativos: en lo cuantitativo la masificación de la Educación Superior con el consiguiente ingreso de sectores sociales históricamente postergados; en lo cualitativo, la instauración de la Educación Superior como un bien público y social, un derecho humano universal y una responsabilidad de los Estados. Se identifican como sentidos más comunes que operan como claves explicativas a ese problema y las políticas y estrategias desarrolladas a partir de los mismos, aquellos que focalizan en el estudiantado con una lectura deficitaria del mismos, las estrategias privilegiadas ubican el problema fuera de la gramática de la propia universidad por lo que resultan soluciones ortopédicas

    Nota crítica sobre after method. Mess in social science research de john law

    Get PDF
    This note aims to make a critical reading of the book After method. Mess in social science research, written by John Law. To this end, the plot of the play will be presented, using criteria analysisidentifying the ontological, epistemological and methodological foundations that support it. John Law is one of the main authors of the actor-network theory, known in Argentina in the field ofsociology of science and technology but with little integration in the area of research methodology. In this text - published only in English- he proposes to conduct a review of the state of scientificmethods in general, but with particular emphasis on the social sciences. His proposal is based on a profound critique of hegemonic epistemology and methodology and warns the limitations of eachmethod: parts of the world are captured by the methods but other parts are not, and if they are, they often do distorting them. Throughout the book, Law will stress, will question, or will cancelsuch epistemological assumptions. For it will use various specific research, which described in detail and to analyze aided by contributions from different philosophical and epistemological critics’perspectives. Analyzing different practices of knowledge (scientific and non-scientific), Law shows each politics and ethics dimension, it reveals the different ontological, epistemological and methodological regimes they programs begin.Esta nota tiene por objetivo realizar una lectura crítica del libro After method. Mess in social science research escrito por el inglés John Law. A tal fin, se presentará el argumento de la obra, tomando como criterio de análisis la identificación de los fundamentos ontológicos, epistemológicos y metodológicos que sostienen a la misma. John Law es uno de los principales autores de la Teoría del Actor-Red, conocido en Argentina en el ámbito de la sociología de la ciencia y la tecnología pero con escasa inserción en el área de la metodología de la investigación. En este texto -publicado sólo en inglés- se propone realizar una revisión del estado de los métodos científicos en general, pero con particular énfasis en las ciencias sociales. Su propuesta se funda en una profunda crítica a la epistemología y metodología hegemónica y advierte las limitaciones de todo método: partes del mundo son captadas por los métodos pero otras no lo son, y si lo son, muchas veces lo hace distorsionándolas. A lo largo del libro, Law tensionará, interpelará, complejizará o anulará dichossupuestos epistemológicos. Para ello se valdrá de diversas investigaciones concretas, las que describirá detalladamente y a las que analizará auxiliado por los aportes de distintas perspectivasfilosófico-epistemológico críticas. Analizando diferentes prácticas de conocimiento (científicas y no científicas), Law muestra la dimensión política y ética de cada una de ellas, pues deja al descubierto los diferentes regímenes ontológicos, epistemológicos y metodológicos que ellas instauran

    La ‘relación con el saber’: revisitando los comienzos del concepto

    Get PDF
    Los estudios sobre la relación con el saber se inician en Francia, en el campo del psicoanálisis, en la década del 60. Existen hoy en la comunidad académica internacional numerosas iniciativas que intentan abordar, desde diferentes disciplinas, algunos problemas de la transmisión de saberes y de su apropiación recurriendo a la potencia heurística de dicha noción. Estas iniciativas incluyen estudios teóricos y empíricos que aluden a la relación con el saber de los sujetos escolares, es decir, de los docentes y alumnos que se inscriben, fundamentalmente en dos grandes escuelas: la psicoanalítica y la sociológica. La primera pertenece al Centre de Recherche Education et Formation (CREF), de la Universidad Paris X-Nanterre, creado por Jacky Beillerot y continuado por Nicole Mosconi y Claudine Blanchard –Lavilla. La sociológica, del Grupo “Educación, socialización y colectividades locales” (ESCOL) se conformó en el año 1987 en el Departamento de Ciencias del Educación de la Universidad París VIII, Saint Denis, bajo la Dirección de Bernard Charlot. Tanto Beillerot (1998), como Charlot (2009) reconocen que fue Lacan el primero en formular el sintagma de “relación con el saber”. En este artículo se sostendrá la hipótesis de que los desarrollos conceptuales y empíricos, que se dan en torno a dicha noción, han descuidado las propias condiciones de producción de la noción en el marco de la propuesta lacaneana. Se describirá el encuadre cultural en el que surge la noción (en el marco de la filosofía francesa de mediados del siglo XX) y, a partir de un recorrido por obras de Lacan, se extraerán algunas lecciones para volver a pensar la relación con el saber

    "Il sistema calcio italiano ed internazionale: risultati economico-sportivi a confronto tra le principali leghe europee"

    Get PDF
    Il lavoro svolto ha permesso di individuare le fasi di gestione di una società di calcio e l’influenza reciproca tra i suoi risultati economico - finanziari e quelli sportivi. Sulla base di quest’ultimo condizionamento sono stati analizzati i risultati economico - sportivi delle quattro maggiori leghe internazionali, ovvero quella italiana, inglese, tedesca e spagnola, individuando nella nostra quella meno competitiva. Lo studio realizzato ha mostrato la difficoltà nel conseguire ricavi e nel gestire i costi da parte delle nostre società conducendole, sia da un punto di vista economico che sportivo, in coda al gruppo. Anche l’analisi dei club campioni nazionali, nella stagione 2012/2013, ha dato conferma delle difficoltà del sistema calcistico italiano rispetto a quello internazionale. Infine è stato interessante individuare alcuni fattori “leva” su cui poter lavorare, allo scopo di migliorare le performance del calcio italiano. Tra questi troviamo una maggiore attenzione al marketing, agli aspetti commerciali ed al merchandising, alla costruzione degli stadi di proprietà e di strutture connesse, alla crescita di validi settori giovanili e al mantenimento di un elevato livello degli introiti da diritti radiotelevisivi

    Usos da noção de rapport au savoir na pesquisa educacional e psicopedagógica

    Get PDF
    This theoretical article reports the incipient, but vigorous, development of the notion of relationship with knowledge in the field of educational research, not only at the international level, but also in Argentina. It shows how this notion has the heuristic capacity to articulate, in the analysis of learning, the relationships and multiple influences and overlaps of the dimensions highlighted by theories of school learning, that is, it can account for how learning occurs at the crossroads of different cognitive and metacognitive processes with their sociohistorical and situational anchorage; the link of the learning subject with the learning objects; the epistemological characteristics of learning objects and the uniqueness of the learner's psyche. It is particularly interesting to highlight the psycho-pedagogical investigations carried out at the local level, both within the framework of research projects and undergraduate and postgraduate theses, accounting for the problems and scientific production that it has allowed to generate.Este artículo teórico da cuenta del incipiente, pero vigoroso, desarrollo de la noción de relación con el saber en el ámbito de la investigación educativa, no sólo a nivel internacional, sino también en Argentina. Muestra como esa noción cuenta con la capacidad heurística de articular en el análisis del aprendizaje, las relaciones y múltiples influencias e imbricaciones de las dimensiones destacadas por las teorías del aprendizaje escolar, es decir, puede dar cuenta como el aprender acontece en la encrucijada de diferentes procesos cognitivos y metacognitivos con su anclaje sociohistórico y situacional; el vínculo del sujeto aprendiente con los objetos de aprendizaje; las características epistemológicas de los objetos de aprendizaje y la singularidad del psiquismo de quien aprende.Interesa particularmente poner en relevancia las investigaciones psicopedagógicas realizadas a nivel local, tanto en el marco de proyectos de investigación como de tesis de grado y posgrado, dando cuenta de las problematizaciones y producción científica que la misma ha permitido generar.Este artigo teórico relata o incipiente, mas vigoroso, desenvolvimento da noção de rapport au savoir no campo da pesquisa educacional, não apenas no nível internacional, mas também na Argentina. Mostra como essa noção tem capacidade heurística de articular, na análise da aprendizagem, as relações e múltiplas influências e sobreposições das dimensões destacadas pelas teorias da aprendizagem escolar, ou seja, pode explicar como ocorre a aprendizagem na encruzilhada de diferentes processos cognitivos e metacognitivos com sua ancoragem sócio-histórica e situacional; o vínculo da disciplina com os objetos de aprendizagem; as características epistemológicas dos objetos de aprendizagem e a singularidade da psique do aluno.É particularmente interessante destacar as investigações psicopedagógicas realizadas em nível local, tanto no âmbito de projetos de pesquisa quanto de teses de graduação e pós-graduação, respondendo pelos problemas e produção científica que ela permitiu gerar
    corecore