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.
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Showing 1 to 20 of 93 for “"water flux"”.
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Development of experimental methods to measure osmosis-driven water flux and molecular transport across nanoporous graphene membranes
… attention as a promising next generation high flux separation membrane. Molecular dynamics simulations predicted graphene's potential for exhibiting both high flux and selectivity as water desalination and gas separation membranes. Measurement of diffusive transport of water and molecules …
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A new passive surface water flux meter for simultaneous measurement of contaminant and water fluxes in streams and rivers
<p>A passive surface water flux meter (PSFM) for measurement of contaminant concentration/flux in rivers and streams is described and tested. The novel PSFM design was developed for portability and ease of adaptability for a variety of contaminant classes. Although previous designs have been …
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Branch, crown, tree and stand water flux in an 180-year-old loblolly pine plantation after thinning, fertilization, and throughfall exclusion treatments
Branch and tree sap flux density (SFD) was measured to evaluate the effects of thinning, fertilization, and throughfall exclusion treatments on water use by loblolly pine (Pinus taeda L.) trees. Variations in SFD at different radial xylem depths were also examined to improve estimates of tree water …
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Comparison of the sodium ion channel densities, the water flux changes, and the membrane capacitance changes in the pelvic and pectoral skin of the toad, Bufo woodhousei
… arginine vasotocin (AVT) stimulated osmotic water flow (JH{dollar}\sb2{dollar}O) across isolated skin from the pelvic but not the pectoral region of the toad, Bufo woodhousei. The apical membrane capacitance (C{dollar}\sb{\rm a}{dollar}) of the cells in the stratum granulosum of neither skin …
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Fast reverse osmosis through nanotube-based membranes: molecular dynamics study
… and its influence extended to the progress of water purification process. Development of novel membranes and modification of existing membranes for efficient water filtration can be studied based on the investigation of interactions between water and molecules constituting membranes. Also, …
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Effect of feed temperature on the performance and properties of the NF270 membrane
… study was done to explore the effect of feed water temperature on the properties and performance of nanofiltration membranes. The NF270 membrane was selected for this study, in which two temperatures of feed solution were passed through the membrane and water flux and salt rejection were …
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Molybdenum disulfide nanoporous membranes for water desalination
… disulfide (MoS2) as a nano porous membrane for water desalination. By performing extensive molecular dynamics simulations, we find that a nanopore in a single-layer MoS2 can effectively reject salt ions and allow transport of water at a high rate. More than 88% of ions are rejected by membranes …
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Nanofiltration membranes modified with aromatic polyamide dendrimers active layers
… the basis of rejection abilities of a variety of water contaminants having a range of sizes and chemistry. As the water flux is inversely proportional to the thickness of the active layer, we optimize the amount of dendrimers deposited for specific contaminants to improve the solute rejection …
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Nanoporous graphene as a desalination membrane : a computational study
With conventional water sources in short and decreasing availability, new technologies for water supply have a crucial role to play in addressing the world's clean water needs in the 21st century. In this thesis, we examine how nanometer-scale pores in single-layer freestanding graphene can …
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Functionalized High Aspect Ratio Cellulose Nanocrystal Filled Composites for Gas and Liquid Separations
… of breathing clean air and drinking potable water. These chemical separations account for a large portion of the total energy use both in the United States and globally. Polymer membrane based separations are desirable when applicable due to their lower energy requirements relative to thermal …
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Effects of transmembrane hydraulic pressure on the performance of forward osmosis membranes, The
… be tested and implemented in various industrial water and wastewater treatment applications. Breakthroughs in research and manufacturing have produced better performing membranes with improved structural integrity and robustness, enabling new treatment applications of difficult to treat oil and …
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Cross-flow ceramic microfiltration of ethanol fermentation broths
… with pore sizes of 0.05 $\mu$m-1.4 $\mu$m. Water permeabilities for the 0.2 $\mu$m Ceraver, Ceraflo and CeraMem membranes were 903, 625 and 308 Lm$\sp{-2}$h$\sp{-1}$bar$\sp{-1}$ (LMH) respectively at 30$\sp\circ$C. Water flux increased with increasing pore size, transmembrane pressure and …
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Modifications in the transport pathways of graphene oxide-based membrane with varying flake size and thickness
… for studying graphene oxide membrane (GOM)-based water purification and dye rejection applications. Based on the structural features, GO flake size and membrane thickness, it is observed that the thicker GOMs composed of larger flake size exhibited effectively higher water flux. Moreover, this …
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Water and energy balance in the Namib sand-dune lizard, Angolosaurus skoogi
The field metabolic rate (FMR) and water flux of the herbivorous Namib sand-dune lizard, Angolosaurus skoogi, was measured during the summer non-breeding period (early January) by means of doubly labelled water. FMR was about half that expected for a lizard of this size. Water flux and laboratory …
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Bryophytes in the hydrological cycle and climate change implications : A case study of La Réunion cloud forest
Bryophytes are able to intercept atmospheric water over the entire surface of their shoot and, once intercepted, this water forms a vital part of the hydrological cycle of their surrounding ecosystems. To investigate the role of bryophytes in the hydrological cycle, our study, conducted in the …
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Modelagem hidrológica unidimensional para um local da Amazônia
… an unidimensional model to evaluate the water balance based on an evapotranspiration model developed by SHUTTLEWORTH (1988) and the generalization of Darcy’s equation for the water flux in an unsaturated soil. The parameters of the model have a physical meaning and can be determined in …
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Genetic Algorithm Based Optimization of Baffle Positions in a Forward Osmosis Draw Channel
… developing technology which shows promise for seawater desalination and wastewater treatment. Due to the fact that asymmetric membranes are widely used in conjunction with this technology, internal concentration polarization (ICP), a flow-entrainment effect occurring within such membranes, is a …
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Development of Modified Reverse Osmosis Membrane with Polymers/Graphene Oxide for Scaling and Biofouling Mitigation
The increasing demand for freshwater, coupled with challenges posed by industrialization and climate change, has reinforced the need for efficient desalination technologies. Reverse osmosis (RO) is widely used due to its energy efficiency; however, operational challenges such as scaling and …
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