Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 22 for “"Water productivity"”.
-
Sustainable Approaches to Enhance Water Productivity in Cucumis melo
… and an improved understanding of plant-water relations offer potential solutions to enhance crop water productivity (CWP). This study conducted at the University of Nevada, Reno, evaluates three sustainable approaches to increase CWP in melons (Cucumis melo L.) under high desert …
-
Natural variation of water use and water productivity in Arabidopsis thaliana
Plant performance under reduced water availability has traditionally been assessed as drought resistance and more recently as water use efficiency (WUE). An extensive body of work has been established over the past 15 years where the natural variation of water use efficiency has been studied in the …
-
An improved multicriterion analysis approach to avoid subjectivity in irrigation water allocation decisions
… was performing poorly. In-built rigidity in water allocations was found as main reason behind its poor performance. The results from the farmers surveys also revealed that the objective of increasing irrigation water productivity would never be attained under the warabandi arrangements. …
-
Modeling Of Membrane Solute Mass Transfer In Ro/nf Membrane Systems
… system. Inorganic and organic solute and water mass transfer coefficients were systematically investigated for dependence on membrane surface properties and NOM mass loading. Inorganic MTCs were accurately described by a Gaussian distribution curve. Water productivity, NOM rejection and …
-
Data-Driven and Process-Based Modeling Approaches for Advancing Irrigation Water and Nitrogen Management in Humid Cropping Systems
… shifts between too little and too much soil water. Since irrigation decisions depend on the current soil water status, this variability makes it harder to know the right timing and amount of irrigation. The same swings also influence how nitrogen moves through the soil. Climate change is …
-
Estimating the marginal value of agricultural irrigation water: A methodology and empirical application to the Berg River Catchment
… facilitate effective and efficient intersectoral water allocation policy in South Africa, where limited water supplies are increasingly constraining necessary economic development. The study develops an economic model of irrigated agricultural production that recognises the multi-output nature of …
-
Trace element signatures of Peruvian and Chilean upwelling sediments
… high organic matter (OM) flux modulating the water column/sedimentary redox state significantly and having an impact on the global carbon cycle. Bulk sediment redox/bio-sensitive trace elements - promising tracers for (paleo) environmental reconstructions - were studied with respect to the …
-
Earth observation technologies for improved agricultural decision support systems in South Africa
… in South Africa, focusing on crop monitoring, water use efficiency, and land management. Firstly, a systematic review of remote sensing applications in Southern African agriculture, evaluating key advancements, challenges, and opportunities was conducted to document the key scientific knowledge …
-
Anomalous carbonate preservation in the abyssal North Pacific, ODP sites 882 and 1179: planktonic foraminiferal analysis, climate change and palaeogeomagnetism /
… depth are related to increased surface water productivity commensurate with terrestrial fertilization of otherwise nutrient-poor gyre areas. Furthermore, these events sequestered CO2 from the atmosphere, contributing to late Cenozoic global cooling. The majority of the peaks correlate …
-
Dinoflagellate cyst record and paleoceanography through the Pliocene–Pleistocene transition at ODP Site 1143, southern South China Sea
… 2) increased nutrient levels and hence surface-water productivity due to increased river input, 3) increased sediment accumulation rate as a result of increased fluvial erosion inferred to aid the rapid burial and preservation of these heterotrophic taxa, and 4) increased winter monsoon …
-
Thermodynamic modeling and design of high-performance adsorption-based atmospheric water harvesting devices
Water scarcity is a grand global challenge since more than two-thirds of world’s population is experiencing water shortage. Atmospheric water harvesting (AWH) addresses this challenge by enabling decentralized freshwater supply in water-stressed and infrastructure-limited areas. Adsorption-based …
-
Modelling the spatial distributions and water use of Mauritius thorn (Caesalpinia decapetala) and river red gum (Eucalyptus camal dulensis) using remote sensing and geographic information system techniques in the Vhembe Biosphere Reserve
… knowledge of the spatial distributions and water use by Mauritius thorn (Caesalpinia decapetala) and River red gum (Eucalyptus camaldulensis) in the Vhembe Biosphere Reserve (VBR). Three remote sensing imagery platforms were assessed in terms of their ability to classify land cover within …
-
Development of electrically conductive membrane distillation for zero liquid discharge by mitigating inorganic scaling
… distillation (MD) is a promising technique in water treatment, known for perfect removal efficiency, low energy use, and low sensitivity to feed salinity. However, high recovery rates lead to challenges like foulant concentration and scaling. Electrically conductive membrane (ECM) technology …
-
Climate change and global crop yield: impacts, uncertainties and adaptation
… study, comparing simulations of crop yield and water use under climate change. I found modelled global average crop water productivity increases by up to 17±20.3% when including carbon fertilisation effects, but decreases to –28±13.9% when excluding them; and identified fundamental uncertainties …
-
Design of advanced reverse osmosis and nanofiltration membranes for water purification
… are being developed from polyimides for water and wastewater treatments. The following three projects have resulted from my research. (1) Positively charged and solvent resistant NF membranes. The use of solvent resistant membranes to facilitate small molecule separations has been a long …
-
The effect of drought and rising temperatures on total factor productivity in pasture-based dairy farming in the Eastern Cape
… will occur. The study is of the total factor productivity of pasture-based dairy production systems in the Eastern Cape. An unbalanced panel dataset of 206 observations collected from 62 farms over nine years was used to fit a stochastic frontier production function with technical inefficiency …
-
Benthic environmental responses to climatic changes during the late Quaternary: a micropalaeontological and geochemical approach
… were inferred to be caused by extreme levels of productivity export which actually hindered the benthos in terms of benthic foraminiferal diversity and accumulation rate; during Heinrich Event 1 and the Younger Dryas within the Mauritanian upwelling system and during late MIS4 and MIS3 within the …
-
Competition For Above And Below Ground Resources Among Annual Species From The Plant To The Field: Quantification Analysis And Modeling
… the understanding of the role of weeds in water use and crop water productivity, ii) to test, through field experiments and an individual based model, the effects of size inequality and plant spatial arrangements on the competitive relationships among plants, the success of individuals, the …
-
Design and Operation of Multi Effect Distillation- Reverse Osmosis based Hybrid Desalination Process. Modelling, Simulation and Optimisation of Design and Operation Parameters of Multi Effect Distillation and Reverse Osmosis Hybrid Desalination Processes for Producing Multi-grade Waters at Minimum Energy and Minimum Cost of Production
The fast growth in the demand of freshwater due to the scarcity of natural water and increase in the world population puts more stress on the desalination sectors, which requires the installation of high-efficient thermal desalination plants. Among these desalination plants, multi effect …
Page 1 of 2