An investigation into the fertilizer particle dynamics off-the-disc

The particle size range specifications for two biosolids-derived organomineral fertilizers (OMF) known as OMF10 (10:4:4) and OMF15 (15:4:4) were established. Such specifications will enable field application of OMF with spinning disc systems using conventional tramlines spacing. A theoretical model was developed, which predicts the trajectory of individual fertilizer particles off-the-disc. The drag coefficient (Cd) was estimated for small time steps (10-6 s) in the trajectory of the particle as a function of the Reynolds number. For the range of initial velocities (20 to 40 m s-1), release angles (0° to 10°) and particle densities (1000 to 2000 kg m-3) investigated, the analysis showed that OMF10 and OMF15 need to have particle diameters between 1.10 and 5.80 mm, and between 1.05 and 5.50 mm, respectively, to provide similar spreading performance to urea with particle size range of 1.00 to 5.25 mm in diameter. OMF10 and OMF15 should have 80% (by weight) of particles between 2.65 and 4.30 mm, and between 2.55 and 4.10 mm, respectively. Due to the physical properties of the material, disc designs and settings that enable working at a specified bout width by providing a small upward particle trajectory angle (e.g., 10°) are preferred to high rotational velocities. However, field application of OMF with spinning discs applicators may be restricted to tramlines spaced at a maximum of 24 m; particularly, when some degree of overlapping is required between two adjacent bouts. The performance of granular fertilizers can be predicted based on properties of the material, such as particle density and size range, using the contour plots developed in this study

Las familias y su relación con la naturaleza : El caso de la comunidad Mapuche de Pilquiniyeu del Limay, Rio Negro. Región Sur

Frente a la visión dominante de la naturaleza como recurso productivo, las familias mapuches de Pilquiniyeu del Limay poseen una relación de diálogo con la naturaleza, como parte de una cosmovisión y como estrategia reproductiva que plantea una relación armónica basada en la gestión de los recursos naturales (agua, leña, suelo, flora, fauna, etc.). Para mantener un modo de vida en un contexto ambiental que según la mirada hegemónica se corresponde a una naturaleza “improductiva” y por tanto no apta para la producción ni la reproducción social y económica.Faced with the dominant view of nature as a productive resource , the Mapuche families Pilquiniyeu of Limay have a relationship of dialogue with nature, as part of a worldview and as a reproductive strategy that poses a harmonious relationship based on management of natural resources ( water, wood , soil, flora, fauna, etc.). To maintain a way of life in an environmental context that according to the hegemonic gaze to " unproductive " corresponds nature and therefore not suitable for the production and social reproduction and economic.Eje A4: Ambiente, Naturaleza y AgroecologíaFacultad de Ciencias Agrarias y Forestale

Las familias y su relación con la naturaleza : El caso de la comunidad Mapuche de Pilquiniyeu del Limay, Rio Negro. Región Sur

Frente a la visión dominante de la naturaleza como recurso productivo, las familias mapuches de Pilquiniyeu del Limay poseen una relación de diálogo con la naturaleza, como parte de una cosmovisión y como estrategia reproductiva que plantea una relación armónica basada en la gestión de los recursos naturales (agua, leña, suelo, flora, fauna, etc.). Para mantener un modo de vida en un contexto ambiental que según la mirada hegemónica se corresponde a una naturaleza “improductiva” y por tanto no apta para la producción ni la reproducción social y económica.Faced with the dominant view of nature as a productive resource , the Mapuche families Pilquiniyeu of Limay have a relationship of dialogue with nature, as part of a worldview and as a reproductive strategy that poses a harmonious relationship based on management of natural resources ( water, wood , soil, flora, fauna, etc.). To maintain a way of life in an environmental context that according to the hegemonic gaze to " unproductive " corresponds nature and therefore not suitable for the production and social reproduction and economic.Eje A4: Ambiente, Naturaleza y AgroecologíaFacultad de Ciencias Agrarias y Forestale

Las familias y su relación con la naturaleza : El caso de la comunidad Mapuche de Pilquiniyeu del Limay, Rio Negro. Región Sur

Frente a la visión dominante de la naturaleza como recurso productivo, las familias mapuches de Pilquiniyeu del Limay poseen una relación de diálogo con la naturaleza, como parte de una cosmovisión y como estrategia reproductiva que plantea una relación armónica basada en la gestión de los recursos naturales (agua, leña, suelo, flora, fauna, etc.). Para mantener un modo de vida en un contexto ambiental que según la mirada hegemónica se corresponde a una naturaleza “improductiva” y por tanto no apta para la producción ni la reproducción social y económica.Faced with the dominant view of nature as a productive resource , the Mapuche families Pilquiniyeu of Limay have a relationship of dialogue with nature, as part of a worldview and as a reproductive strategy that poses a harmonious relationship based on management of natural resources ( water, wood , soil, flora, fauna, etc.). To maintain a way of life in an environmental context that according to the hegemonic gaze to " unproductive " corresponds nature and therefore not suitable for the production and social reproduction and economic.Eje A4: Ambiente, Naturaleza y AgroecologíaFacultad de Ciencias Agrarias y Forestale

O CONTEXTO PÓS-DEMARCATÓRIO: QUANDO SE TRATA DE REDEFINIR O CONTROLE SOCIAL SOBRE OS RECURSOS NATURAIS E BENS CULTURAIS

O artigo apresenta formulações que se desdobram da síntese teórica para a reorganização social de grupos étnicos elaboradas pelo antropólogo João Pacheco de Oliveira, em especial quando atrelada à conquista de garantias fundiárias. A intenção, neste momento, foi avolumar a discussão desse lugar teórico estabelecido pelo supracitado autor para aprofundar a ideia da redefinição do controle social sobre os recursos ambientais. A expectativa é que, ao explorar tais concepções, seja possível contribuir para os estudos voltados à compreensão de movimentos identitários socioespaciais reivindicatórios, gerando aportes para interpretações do momento pós-demarcatório, dialogando com o que é denominado atualmente de gestão ambiental e territorial em terras indígenas. Neste ensaio, formulou-se a ideia da redefinição do controle social sobre os recursos naturais e bens culturais como fenômeno relevante nas interpretações de processos de reorganização social de repercussão territorial de grupos sociais e étnicos

Body Composition Changes in Hemodialysis Patients: Implications for Prognosis

Background: Overhydration, inflammation and protein-energy wasting have been related to all-cause mortality in dialysis patients, being lean mass loss, a poor prognostic factor. Objective: to monitor body composition changes (BCC) in hemodialysis (HD) patients and to relate BCC to mortality. Methods: Prospective follow up study: Bioimpedance spectroscopy (BIS) and nutritional parameters were performed every 6 months during three years. Results : Overall data show a significant loss of weight at 12m, 24m, and 36m, with decrease of lean tissue index and phase angle (PA) in each period measured. Fat tissue index (FTI) diminished in the third year’s measurements. End of first year, 41 % of patients gain weight, them at baseline had lower age, higher serum albumin, lower Extracelular/intracellular water index (ECW/ICW) and higher PA, showing a significant FTI increase. Higher baseline PA was gain weight predictor by binary logistic regression. Cox regression analyses: Age, diabetes, HD technique, albumin, ECW/ICW, and PA were mortality predictors in univariate analysis; being PA the main mortality predictor in multivariate analysis. BCC were not associated with mortality. ROC curve: PA higher than 4.85° is protective for mortality. Conclusions: Lean mass loss was the most important change during follow up; we have not observed association between BCC with mortality. PA was the main mortality predictor.S

Recursos Educativos Abiertos para nuevos estudiantes: curso MOOC sobre “Elaboración de textos en el ámbito académico”

Recursos Educativos Abiertos para nuevos estudiantes: curso MOOC sobre “Elaboración de textos en el ámbito académico” tiene como finalidad preparar y presentar adecuadamente diferentes recursos y materiales para la creación y mejora de la redacción de textos académicos

Escribir en la Universidad: Explotación de materiales multimedia

Depto. de Lengua Española y Teoría de la LiteraturaFac. de FilologíaFALSEsubmitte

Gas turbine shaft over-speed/failure performance modelling

A gas turbine engine can over-speed due to various reasons, including shaft failure, variable geometry mal-schedule or fuel system malfunction. In any case, engine manufacturers are required to demonstrate that a shaft over-speed event will not result in an uncontained failure with high energy debris being released from the engine. Although the certification authority can be satisfied that the engine is shaft failure safe by conducting large scale tests, a purely experimental approach would be very complex and expensive. Moreover, today’s poor understanding of the event leads to conservative designs that exert unavoidable penalties on the engine performance and weight. It is in this context that the need for an analytical approach and small scale testing arises to model the progression of the event. This work is part of a wider long term research collaboration between Cranfield University and Rolls-Royce that attempts to enhance today’s modelling capability of gas turbine shaft overspeed/ failure events. The final aim of the project is the development of a generic advanced performance prediction tool able to account for all the complex and heavily interrelated phenomena to ascertain the terminal speed of the over-speeding turbine. This multidisciplinary “all in one” tool will allow to include the shaft failure scenario early into the design process and eliminate current conservative design approaches while maintaining the high standard of airworthiness required for certification. This thesis focuses on the aerothermal performance modelling of turbomachinery components at the extreme off-design conditions experienced during a shaft over-speed event. In particular, novel modelling techniques and methodologies at the forefront of knowledge have been developed to simulate the performance of turbine vanes at high negative incidence angles, derive the extended compressor characteristics in reverse flow and calculate the response of the air system during rapid transient among others. These component models are ready to be integrated into a generic single computational tool that, once validated against engine data available from the sponsor, can be applied to different engines and scenarios. The collaboration with Rolls-Royce provided the opportunity to conduct research on other areas related to performance engineering apart from the shaft failure modelling. The present study makes several noteworthy contributions on compressor variable geometry loss, deviation and stall modelling, compressor variable geometry schedule optimisation and on the effect of using real gas models instead of the perfect gas assumption in engine performance simulation codes

O CONTEXTO PÓS-DEMARCATÓRIO: QUANDO SE TRATA DE REDEFINIR O CONTROLE SOCIAL SOBRE OS RECURSOS NATURAIS E BENS CULTURAIS

O artigo apresenta formulações que se desdobram da síntese teórica para a reorganização social de grupos étnicos elaboradas pelo antropólogo João Pacheco de Oliveira, em especial quando atrelada à conquista de garantias fundiárias. A intenção, neste momento, foi avolumar a discussão desse lugar teórico estabelecido pelo supracitado autor para aprofundar a ideia da redefinição do controle social sobre os recursos ambientais. A expectativa é que, ao explorar tais concepções, seja possível contribuir para os estudos voltados à compreensão de movimentos identitários socioespaciais reivindicatórios, gerando aportes para interpretações do momento pós-demarcatório, dialogando com o que é denominado atualmente de gestão ambiental e territorial em terras indígenas. Neste ensaio, formulou-se a ideia da redefinição do controle social sobre os recursos naturais e bens culturais como fenômeno relevante nas interpretações de processos de reorganização social de repercussão territorial de grupos sociais e étnicos