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 9 of 9 for “"semipermeable membrane"”.
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Assessing the fate of PAHs in the Boston Inner Harbor using semipermeable membrane devices (SPMDs)
… study used a relatively new sampling tool called semipermeable membrane devices (SPMDs) to quantify dissolved concentrations of the following polycyclic aromatic hydrocarbons (PAHs) in three locations of the Boston Inner Harbor: phenanthrene, methylphenanthrene's, fluoranthene, pyrene, …
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Polyethylene devices and the effects of sediment resuspension on the cycling of PAHs and PCBs in the lower Hudson Estuary
… the aquatic environment was demonstrated. Like semipermeable membrane devices (SPMDs) and solid-phase microextraction (SPME), PEDs passively measure the concentration of chemical present in the dissolved phase. PEDs provide for in situ, time-averaged measurements with fast equilibration times …
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Engineered osmosis technology for desalination of oil and gas exploration wastewaters: assessment of membrane performance and process sustainability
… and minimal field resources. An emerging membrane technology that can treat impaired water for industrial reuse is forward osmosis (FO). In FO, a highly concentrated draw solution imparts an osmotic pressure difference across a semipermeable membrane to extract water from impaired feed …
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Minding the medicine and medicalising the mind: Investigating the cultural and social history of Cardiff city mental hospital 1908 - 1930.
… as the Welsh metropolis and was surrounded by a semipermeable membrane allowing passage in both directions between itself and the local community. The role of the superintendent is discovered to have<br/>been one of negotiation and compromise rather than of authority. The research played little …
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Microfluidic Concentration Gradient Generation and Integrated Magnetic Sorting of Microparticles
… devices featuring two-layer design sandwiching a semipermeable membrane is presented. The devices effectively eliminate fluid flow while maintain a stable concentration gradient in the gradient generation region. Thirdly, the flow-free CGG devices are extended to realize arbitrary concentration …
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"The New Chemistry" - Sustainable Catalysis with Alcohols
… Due to sealing the synthesis reactor with a semipermeable membrane, the retransfer of the “borrowed” hydrogen could be prevented and H2 is released. Dehydrogenation and condensation steps are now possible instead of BH/HA. By reacting secondary alcohols with β-amino alcohols, pyrroles were …
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Influence of Temperature and Time on Nutrient Release Patterns of Osmocote Plus™, Nutricote™, and Polyon™ Controlled-Release Fertilizers
Polymer-coated controlled-release fertilizers (PCFs) are the most widely used class of fertilizers in the production of container-grown nursery plants. Nutrient release from PCFs is primarily influenced by temperature. The objective of this study was to determine the influences of temperature and …
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Limiting membrane and diffusion behavior of a compacted sand-bentonite mixture for hydraulic and chemical containment
… or economically feasible. The existence of membrane behavior, i.e., the ability of a porous material to exhibit selective restriction of migrating chemical species from the clay pores, previously has been shown for typical engineered bentonite-based barriers commonly used in hydraulic and …
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Development of an in vitro drug recovery model for paediatric tuberculous meningitis using microdialysis with in vivo application
… and protein. The MD catheter had 20 kDa semipermeable membrane that allowed passage of only unbound drugs. To examine recovery, we compared rifampicin concentrations in hourly samples through the MD catheter (termed microdialysate) to total rifampicin in control CSF samples (obtained from …