56 research outputs found
DRUG SOLUBILIZATION USING N-METHYL PYRROLIDONE: EFFICIENCY AND MECHANISM By
No full textRights Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author
An Optimal Mapping Method for Earth-Observation Constellations Using a Maximum Bipartite Matching Algorithm
No full textPoster presented during the 2025 SmallSat Conference
Tasks for Mediating the Process of Knowing and Learning to Design and Make
No full textResearch in Design and Technology Education (D&TE) suggests that teachers need to appreciate the critical aspects of design and make. These aspects include developing an understanding of ill-structured problems, role of imagery and visualisation, need for collaboration and the influence of values in design thinking. The study reported in this paper explored the use of carefully designed tasks to develop critical reflection on the design and make processes among student-teachers (participants). The participants were 34 masters’ students who opted for D&TE course as part of their teacher preparation programme taught by the teacher-researcher (author). An analysis of participants’ engagement with two of the tasks designed by the author revealed challenges in attending to functional and structural details of artefacts, particularly when making shifts between micro and macro features. The tasks mediated the process of knowing and learning how to design and make, by affording simultaneous attention to cognitive, metacognitive and affective experiences in classroom discussions. As participants worked on tasks, the interplay of knowledge and skills created opportunities for discussing epistemic identity. The study suggests that learning mediated through design-and-make engagements provides an inward gaze into the process of designing and the purposes of technology. The paper concludes with the affordance of contextual and experientially informed understanding in handling the challenges of preparing teachers to teach design-and-make
Tasks for Mediating the Process of Knowing and Learning to Design and Make
No full textResearch in Design and Technology Education (D&TE) suggests that teachers need to appreciate the critical aspects of design and make. These aspects include developing an understanding of ill-structured problems, role of imagery and visualisation, need for collaboration and the influence of values in design thinking. The study reported in this paper explored the use of carefully designed tasks to develop critical reflection on the design and make processes among student-teachers (participants). The participants were 34 masters’ students who opted for D&TE course as part of their teacher preparation programme taught by the teacher-researcher (author). An analysis of participants’ engagement with two of the tasks designed by the author revealed challenges in attending to functional and structural details of artefacts, particularly when making shifts between micro and macro features. The tasks mediated the process of knowing and learning how to design and make, by affording simultaneous attention to cognitive, metacognitive and affective experiences in classroom discussions. As participants worked on tasks, the interplay of knowledge and skills created opportunities for discussing epistemic identity. The study suggests that learning mediated through design-and-make engagements provides an inward gaze into the process of designing and the purposes of technology. The paper concludes with the affordance of contextual and experientially informed understanding in handling the challenges of preparing teachers to teach design-and-make
It takes two (or more) to tango: Partnerships within the education sector in Timor-Leste
No full textRecent international declarations stress the importance of partnerships between and amongst donors, the state and civil society, in order to improve service delivery and promote qualities of good governance, particularly in key sectors such as education. However, in conditions of state fragility—where high levels of distrust between and amongst these ‘partners’ may exist; large and often ungovernable flows of assistance are common; and the capacity of state institutions is weak or non-existent—the feasibility of such partnerships must be critically examined. This paper examines these dilemmas within the context of Timor-Leste’s basic education sector, with specific attention paid to how external actors, internal service providers and the Ministry of Education have ‘partnered’ to qualify more than 8,000 teachers through in-service training. The author suggests that donors are increasingly compelled to work within a framework, which presents both practical challenges and deeper ideological conundrums. Ultimately, the interests of teachers and children are being left behind in the drive for alignment, coordination and harmonisation.VoR - Version of Recor
It takes two (or more) to tango: Partnerships within the education sector in Timor-Leste
No full textRecent international declarations stress the importance of partnerships between and amongst donors, the state and civil society, in order to improve service delivery and promote qualities of good governance, particularly in key sectors such as education. However, in conditions of state fragility—where high levels of distrust between and amongst these ‘partners’ may exist; large and often ungovernable flows of assistance are common; and the capacity of state institutions is weak or non-existent—the feasibility of such partnerships must be critically examined. This paper examines these dilemmas within the context of Timor-Leste’s basic education sector, with specific attention paid to how external actors, internal service providers and the Ministry of Education have ‘partnered’ to qualify more than 8,000 teachers through in-service training. The author suggests that donors are increasingly compelled to work within a framework, which presents both practical challenges and deeper ideological conundrums. Ultimately, the interests of teachers and children are being left behind in the drive for alignment, coordination and harmonisation
Advanced optical diagnostic techniques for heat transfer measurments in supercritical CO2 flows
No full textSupercritical CO2 (sCO2) has been proposed for many applications, such as power generation, air conditioning, and thermal management of electronic equipment. In proximity to critical conditions, the thermal and transport properties of the CO2 vary abruptly, promoting a significant heat transfer enhancement. Revealing the heat transfer processes associated with CO2 flows requires measuring fluid temperature, pressure, heat transfer coefficients, velocities, etc. However, fundamental knowledge about the heat transfer processes at near-critical conditions is not fully understood. Advanced optical techniques should be considered to measure these properties of sCO2. These techniques include Schlieren Imaging to capture the density gradient, LIF ( Laser Induced Fluorescence) for temperature measurement, and PIV ( Particle Image Velocimetry) for measurement of the velocity flow field. Different experimental setups have been built to apply the advanced optical technique. The Schlieren imaging has been used to capture the density gradient of the methane injection into the chamber filled with CO2 at supercritical thermodynamic conditions. The density gradient in the flow helped to define the jet cone angle. The micro-channel setup was implemented through which a mixture of CO2 and Rh6G dye was flowed. The dye particles will act as a thermal probe and measure the temperature of the CO2 flow at near supercritical conditions by applying the LIF ( Laser Induced Fluorescence). Initially, the feasibility of the backlight micro-PIV technique was demonstrated by performing experiments with the methanol and non-fluorescent tracers. Then the author applied the the same technique for the first time to measure the velocity of the liquid CO2 flow through a T-channel. Furthermore, the bottom of the channel was painted with fluorescence color to excite, which helps to observe the shadows of the non-fluorescent particles used to measure the velocity of the flow
Mapping and Modelling Specific Sediment Yield and Future Soil Erosion Trends in the Jhelum Catchment, India
No full textAbstract
Soil erosion management is a crucial component of sustainable soil and water management, especially in regions where agricultural productivity is at risk and areas that are more vulnerable to the impacts of climate change, such as the Himalayan region. This study explores soil erosion dynamics in the Jhelum Catchment, India, using advanced mapping and modelling techniques to analyse and predict trends of potential soil loss from 2020 to 2090. The study integrates the RUSLE model with projected climate to assess the impact of climate change on soil erosion and rainfall erosivity. The InVEST SDR model is used to quantify sediment transport and specific sediment yield, enhancing our understanding of the hydrological processes that drive soil erosion and sediment mobilisation in the Jhelum Catchment. The RUSLE, along with advanced climate modelling, land-use data, and spatial analysis, is used in this study to predict trends in soil erosion. Climate data from the Coupled Model Intercomparison Project Phase 6 (CMIP6) is combined with data from the India Meteorological Department (IMD) to project rainfall erosivity (R). R, along with soil erodibility (K), slope length and steepness (LS), land cover (C), and support practices (P) factors, are mapped and applied in the Revised Universal Soil Loss Equation (RUSLE) model, which evaluates the potential for soil erosion. This study forecasts soil loss trends by combining climate data, land-use information, and spatial analysis from 2020 to 2090 under two scenarios [SSP245 (moderate emissions) and SSP585 (high emissions)]. Results indicate escalating soil loss, particularly in less severe areas in 2020, highlighting the dynamic threat. The mean value of soil loss for SSP245 exhibits a continuous rise from 46.17 t/ha/year in 2030 to 51.54 t/ha/year in 2090. SSP585 shows a more severe trend, peaking at 71.67 t/ha/year in 2090. The study also classifies potential soil loss into severity classes, observing a decrease in the percentage area of less severe classes over time. Soil erosion class-wise projections from 2020 to 2090, based on LULC and soil type, reveal trends across various categories of land use, including Agriculture, Forest, Built-up Areas, and Grass/Grazing Land, as well as soil types like Cambisols, Lithosols, Glaciers, and Inland Water. These results highlight the urgent need for proactive interventions, offering practical insights for sustainable land management and providing actionable guidance for strategic planning and policy development focused on sustainable agricultural practices and climate change adaptation. This novel approach integrates advanced modelling and GIS-based analysis, making it applicable to other catchments with similar climate and land-use challenges. The study's findings directly apply to informing land management strategies, making the research highly relevant and practical.Abstract
Soil erosion management is a crucial component of sustainable soil and water management, especially in regions where agricultural productivity is at risk and areas that are more vulnerable to the impacts of climate change, such as the Himalayan region. This study explores soil erosion dynamics in the Jhelum Catchment, India, using advanced mapping and modelling techniques to analyse and predict trends of potential soil loss from 2020 to 2090. The study integrates the RUSLE model with projected climate to assess the impact of climate change on soil erosion and rainfall erosivity. The InVEST SDR model is used to quantify sediment transport and specific sediment yield, enhancing our understanding of the hydrological processes that drive soil erosion and sediment mobilisation in the Jhelum Catchment. The RUSLE, along with advanced climate modelling, land-use data, and spatial analysis, is used in this study to predict trends in soil erosion. Climate data from the Coupled Model Intercomparison Project Phase 6 (CMIP6) is combined with data from the India Meteorological Department (IMD) to project rainfall erosivity (R). R, along with soil erodibility (K), slope length and steepness (LS), land cover (C), and support practices (P) factors, are mapped and applied in the Revised Universal Soil Loss Equation (RUSLE) model, which evaluates the potential for soil erosion. This study forecasts soil loss trends by combining climate data, land-use information, and spatial analysis from 2020 to 2090 under two scenarios [SSP245 (moderate emissions) and SSP585 (high emissions)]. Results indicate escalating soil loss, particularly in less severe areas in 2020, highlighting the dynamic threat. The mean value of soil loss for SSP245 exhibits a continuous rise from 46.17 t/ha/year in 2030 to 51.54 t/ha/year in 2090. SSP585 shows a more severe trend, peaking at 71.67 t/ha/year in 2090. The study also classifies potential soil loss into severity classes, observing a decrease in the percentage area of less severe classes over time. Soil erosion class-wise projections from 2020 to 2090, based on LULC and soil type, reveal trends across various categories of land use, including Agriculture, Forest, Built-up Areas, and Grass/Grazing Land, as well as soil types like Cambisols, Lithosols, Glaciers, and Inland Water. These results highlight the urgent need for proactive interventions, offering practical insights for sustainable land management and providing actionable guidance for strategic planning and policy development focused on sustainable agricultural practices and climate change adaptation. This novel approach integrates advanced modelling and GIS-based analysis, making it applicable to other catchments with similar climate and land-use challenges. The study's findings directly apply to informing land management strategies, making the research highly relevant and practical
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