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 14 of 14 for “"chlorofluorocarbon"”.
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Sustainable design of hydrocarbon refrigerants applied to the hermetic compressor
… led to the control and phase out of traditional chlorofluorocarbon refrigerants (CFCs) under the terms of the Montreal protocol. CFCs used in domestic applications were initially replaced with hydrofluorocarbons (HFCs) such as R134a which has a zero ozone depletion potential (ODP). The use of …
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Spatial-Longitudinal Bent-Cable Model with an Application to Atmospheric CFC Data
… methodology with an application to atmospheric chlorofluorocarbon (CFC) data. We also present a simulation study to demonstrate the performance of our proposed methodology. Although we have tailored our work for the CFC data, our modelling framework may be applicable to a wide variety of other …
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Sustainable development of refrigerator systems using replacement environmentally acceptable refrigerants
… considerations have led to the phase out of chlorofluorocarbon (CFC) refrigerants from the domestic refrigeration industry. One intriguing aspect is that the chlorine in CFCs is a good lubricating agent and any deterioration of system performance may adversely influence other environmental …
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Buoyancy-driven circulation in the Red Sea
… with minimum potential vorticity and maximum chlorofluorocarbon-12. The pathway of the RSOW is also explored using numerical simulation. If diffusivity is not considered, the production rate of the RSOW is estimated to be 0.63 Sv using Walin’s method. By comparing this 0.63 Sv to the actual …
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Development of a process for the production of fluxless solder spheres for BGA electronics packaging
… the flux residues have to be cleaned using chlorofluorocarbon (CFC) solvents. Because of environmental and worker-safety concerns. CFC will be eliminated in the next few years. Thus the need to develop a process for producing fluxless solder spheres for BGAs is a critical issue. This work …
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Buoyancy-driven circulation in the Red Sea
… with minimum potential vorticity and maximum chlorofluorocarbon-12. The pathway of the RSOW is also explored using numerical simulation. If diffusivity is not considered, the production rate of the RSOW is estimated to be 0.63 Sv using Walin's method. By comparing this 0.63 Sv to the actual …
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Aquifer Characterization in the Blue Ridge Physiographic Province
… and deeper bedrock aquifers. Water chemistry and chlorofluorocarbon (CFC) age dating analyses indicated significant differences between water samples from the shallow and deep aquifers. A new conceptual model for Blue Ridge aquifers is proposed based on these research findings.
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Tracing Wyville Thomson Ridge Overflow Water in the Rockall Trough
… time. Using a variety of chemical tracer s (chlorofluorocarbons, oxygen, nutrients and aluminium) in conjunction with temperature and salinity, WTOW is traced southwards into the northern and central Rockall Trough as well as into the channels between the western banks. The overflow water has …
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The use of coated micropowders to reduce radiation heat transfer in foam insulation
… insulation currently available for buildings. Chlorofluorocarbon (CFC) blowing agents, which have low thermal conductivities, contribute highly to the effectiveness of this insulation. However, CFC blowing agents are being phased out because they are depleting the earth's protective ozone …
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The Physical Chemistry of pMDI Formulations Derived from Hydrofluoroalkane Propellants. A Study of the Physical Behaviour of Poorly Soluble Active Pharmaceutical Ingredients; Bespoke Analytical Method Development Leading to Novel Formulation Approaches for Product Development.
… the Montreal Protocol initiated a move away from chlorofluorocarbon (CFC) based devices has resulted in better performing products, with increased lung deposition and a concomitant reduction in oropharyngeal deposition. The physical properties of HFA propellants are however poorly understood and …
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Professionals Knowledge Of Standards Required For Leed Certification Of Indoor Recreation Facilities At Four Year Public Universities
… Prerequisites measured whether facilities used chlorofluorocarbon-based refrigerants. The three most met standards among UAs and CRAs at universities with a noncertified CRF were Materials and Resources, Indoor Air Quality, and Prerequisites. Results suggest that at universities with a …
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Scuffing and wear of engineering materials under different lubrication regimes in the presence of environmentally friendly refrigerants
… since the early 1990’s as replacement to chlorofluorocarbon (CFCs) refrigerants that were non-flammable and non-toxic, but posses a high ozone depletion potential (ODP). Despite the fact that HFCs have zero ODP, they were found to have a high global warming potential (GWP) being considered …
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Effect of surface modifications on biodegradation of nanocellulose and microbial response
History teaches us that novel materials, such as chlorofluorocarbon and asbestos, can have dire unintended consequences to human and environmental health. The exponential growth of the field of nanotechnology and the products developed along the way provide the opportunity for a new paradigm of …
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Performance of two different types of inhalers. Influence of flow and spacer on emitted dose and aerodynamic characterisation.
This thesis is based around examination of three mainstream inhaled drugs Formoterol, Budesonide and Beclomethasone for treatment of asthma and COPD. The areas investigated are these which have been raised in reports and studies, where there are concern, for drug use and assessment of their use. In …