You searched for subject:(barrier).
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Delft University of Technology
1.
Sturm, O.L.M. (author).
Prefeasibility study on a barrier downstream of HCMC: A potential solution for the flood and salt intrusion problem.
Degree: 2011, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:f39a4f38-f129-4e43-bbe4-a9338a425c19 
► Ho Chi Minh City (HCMC) is one of the most important cities in Vietnam; it is the largest city and the economic centre of the…
(more)
▼ Ho Chi Minh City (HCMC) is one of the most important cities in Vietnam; it is the largest city and the economic centre of the country. Currently HCMC is facing two main problems: frequent flooding of the city and salt intrusion in the Dong Thap Muoi region. Most floods are the result of monthly high tides that hinder the discharge of rain and river discharge water. Floods as a result of solely high river discharge or storm surge are less probable. It is expected that the flood problem will increase in the future due to urban and industrial developments in low lying areas, climate change and land subsidence. A possible solution for, or contribution in solving, these problems is controlling the in- and outflow in the estuary mouth to a feasible extent with a barrier downstream of HCMC. In this study the feasibility of different barrier options is determined and compared using a simple multi criteria analysis, taken the main interest of five stakeholders into account.
Coastal Engineering
Hydraulic Engineering
Civil Engineering and Geosciences
Advisors/Committee Members: Stive, M.J.F. (mentor), Vrijling, J.K. (mentor), Labeur, R.J. (mentor), Schiereck, G.J. (mentor).
Subjects/Keywords: barrier
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APA (6th Edition):
Sturm, O. L. M. (. (2011). Prefeasibility study on a barrier downstream of HCMC: A potential solution for the flood and salt intrusion problem. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:f39a4f38-f129-4e43-bbe4-a9338a425c19
Chicago Manual of Style (16th Edition):
Sturm, O L M (author). “Prefeasibility study on a barrier downstream of HCMC: A potential solution for the flood and salt intrusion problem.” 2011. Masters Thesis, Delft University of Technology. Accessed April 18, 2021.
http://resolver.tudelft.nl/uuid:f39a4f38-f129-4e43-bbe4-a9338a425c19.
MLA Handbook (7th Edition):
Sturm, O L M (author). “Prefeasibility study on a barrier downstream of HCMC: A potential solution for the flood and salt intrusion problem.” 2011. Web. 18 Apr 2021.
Vancouver:
Sturm OLM(. Prefeasibility study on a barrier downstream of HCMC: A potential solution for the flood and salt intrusion problem. [Internet] [Masters thesis]. Delft University of Technology; 2011. [cited 2021 Apr 18].
Available from: http://resolver.tudelft.nl/uuid:f39a4f38-f129-4e43-bbe4-a9338a425c19.
Council of Science Editors:
Sturm OLM(. Prefeasibility study on a barrier downstream of HCMC: A potential solution for the flood and salt intrusion problem. [Masters Thesis]. Delft University of Technology; 2011. Available from: http://resolver.tudelft.nl/uuid:f39a4f38-f129-4e43-bbe4-a9338a425c19
Delft University of Technology
2.
Ruckstuhl, Y.M. (author).
Investigation of Different Solvers for Radiotherapy Treatment Planning Problems.
Degree: 2014, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:13d72d18-cee1-4b32-8a97-36301c6b5bcd
► Radiotherapy treatment planning involves solving inequality constrained minimization problems. The currently used interior point solver performs well, but is considered relatively slow. In this thesis…
(more)
▼ Radiotherapy treatment planning involves solving inequality constrained minimization problems. The currently used interior point solver performs well, but is considered relatively slow. In this thesis we investigate two different solvers based on the logarithmic barrier method and Sequential Quadratic Programming (SQP) respectively. We argue that the behaviour of the logarithmic barrier solver is uncertain, thereby making it generally unreliable in this context. In addition we substantiate that the performance of the SQP solver is solid, but lacks efficiency in computing the minimizers of its related quadratic subproblems. We conclude that without serious improvements, none of the solvers investigated are faster than the currently used interior point optimizer.
Applied mathematics
Electrical Engineering, Mathematics and Computer Science
Advisors/Committee Members: Keijzer, M. (mentor), Breedveld, S. (mentor).
Subjects/Keywords: barrier method
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APA (6th Edition):
Ruckstuhl, Y. M. (. (2014). Investigation of Different Solvers for Radiotherapy Treatment Planning Problems. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:13d72d18-cee1-4b32-8a97-36301c6b5bcd
Chicago Manual of Style (16th Edition):
Ruckstuhl, Y M (author). “Investigation of Different Solvers for Radiotherapy Treatment Planning Problems.” 2014. Masters Thesis, Delft University of Technology. Accessed April 18, 2021.
http://resolver.tudelft.nl/uuid:13d72d18-cee1-4b32-8a97-36301c6b5bcd.
MLA Handbook (7th Edition):
Ruckstuhl, Y M (author). “Investigation of Different Solvers for Radiotherapy Treatment Planning Problems.” 2014. Web. 18 Apr 2021.
Vancouver:
Ruckstuhl YM(. Investigation of Different Solvers for Radiotherapy Treatment Planning Problems. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Apr 18].
Available from: http://resolver.tudelft.nl/uuid:13d72d18-cee1-4b32-8a97-36301c6b5bcd.
Council of Science Editors:
Ruckstuhl YM(. Investigation of Different Solvers for Radiotherapy Treatment Planning Problems. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:13d72d18-cee1-4b32-8a97-36301c6b5bcd
Delft University of Technology
3.
Sun, X. (author).
Living over The Sea: A Barrier Building Complex.
Degree: 2014, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:3e1fd3bb-a9dd-4e07-af1e-62eb0f182ba7
► The building across the new inlet on the Rockaway peninsula acts as a surge barrier when the storms come. It will serve as the vital…
(more)
▼ The building across the new inlet on the Rockaway peninsula acts as a surge barrier when the storms come. It will serve as the vital connections for the driving, biking as well as walking after the inlet is dredged out. The building has multi-level relationships with the sea as it is facing the inner bay area, the outer sea and the beaches around. Various possibilities of human activities will occur as the dwelling complex generates different interface with the water.
Rebuild by Design - New York Post-Sandy Resilience
Delta Interventions
Architecture and The Built Environment
Advisors/Committee Members: Palmboom, F.J. (mentor), Meijs, M.H. (mentor).
Subjects/Keywords: barrier building
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APA (6th Edition):
Sun, X. (. (2014). Living over The Sea: A Barrier Building Complex. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:3e1fd3bb-a9dd-4e07-af1e-62eb0f182ba7
Chicago Manual of Style (16th Edition):
Sun, X (author). “Living over The Sea: A Barrier Building Complex.” 2014. Masters Thesis, Delft University of Technology. Accessed April 18, 2021.
http://resolver.tudelft.nl/uuid:3e1fd3bb-a9dd-4e07-af1e-62eb0f182ba7.
MLA Handbook (7th Edition):
Sun, X (author). “Living over The Sea: A Barrier Building Complex.” 2014. Web. 18 Apr 2021.
Vancouver:
Sun X(. Living over The Sea: A Barrier Building Complex. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Apr 18].
Available from: http://resolver.tudelft.nl/uuid:3e1fd3bb-a9dd-4e07-af1e-62eb0f182ba7.
Council of Science Editors:
Sun X(. Living over The Sea: A Barrier Building Complex. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:3e1fd3bb-a9dd-4e07-af1e-62eb0f182ba7
Tulane University
4.
Culling, Daniel.
Shallow geologic framework, geomorphic evolution, and sand resources of a paleo-barrier shoreline, Terrebonne Bay, Louisiana, USA.
Degree: 2018, Tulane University
URL: https://digitallibrary.tulane.edu/islandora/object/tulane:78565
► The Louisiana coast is an invaluable asset to the nation's human, economic, and ecological welfare. However, due to the combined effects of coastal erosion, subsidence,…
(more)
▼ The Louisiana coast is an invaluable asset to the nation's human, economic, and ecological welfare. However, due to the combined effects of coastal erosion, subsidence, and sea level rise, Louisiana is losing on average 25 km2 of its valuable coastal wetlands per year. Terrebonne Bay and the associated Lafourche deltaic lobe headland is a critical section of this coast for wetlands and infrastructure protection and restoration in the State’s Master Plan. Historical imagery and bathymetry clearly show the rapid transgression and erosional degradation of both sets of headland-flanking barrier island shorelines due to wave attack and relative sea level rise in the past 150 y. The focus of the present study is a barrier island system: an ocean-fronting modern- barrier shoreline (Timbalier) and a paleo-deltaic headland barrier arc (Terrebonne) inland of the active barrier. The evolution of the modern barrier arc is closely tied to the shallow geologic framework over which it is transgressing, and specifically the sand re-activation capacity of the antecedent geology once erosional forces are introduced. To understand the evolution of these barrier systems and how to address their protection and re-nourishment, it is important to quantify (1) the depositional facies geometry and (2) the volume of sand in these back-barrier sandy lithosomes.
Here we present new observations from CHIRP sub-bottom seismic, multibeam bathymetry, and surface grab and vibracore sampling in an effort to
quantify the sediment availability within the underlying geologic framework and reconstruct the geomorphic evolution of these barrier shorelines. Observations of sandy units agree with results from Kulp et al. (2005), who showed the presence and extent of sandy lithofacies within 3 m of the surface proximal to the Raccoon Pass tidal-inlet. We provide evidence to suggest that this sand is an important potential resource for the longevity of proximal sandy barrier islands as transgression continues.
1
Daniel Culling
Advisors/Committee Members: Allison, Mead (Thesis advisor), School of Science & Engineering Earth and Environmental Sciences (Degree granting institution).
Subjects/Keywords: Barrier Island Evolution
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APA ·
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APA (6th Edition):
Culling, D. (2018). Shallow geologic framework, geomorphic evolution, and sand resources of a paleo-barrier shoreline, Terrebonne Bay, Louisiana, USA. (Thesis). Tulane University. Retrieved from https://digitallibrary.tulane.edu/islandora/object/tulane:78565
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Culling, Daniel. “Shallow geologic framework, geomorphic evolution, and sand resources of a paleo-barrier shoreline, Terrebonne Bay, Louisiana, USA.” 2018. Thesis, Tulane University. Accessed April 18, 2021.
https://digitallibrary.tulane.edu/islandora/object/tulane:78565.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Culling, Daniel. “Shallow geologic framework, geomorphic evolution, and sand resources of a paleo-barrier shoreline, Terrebonne Bay, Louisiana, USA.” 2018. Web. 18 Apr 2021.
Vancouver:
Culling D. Shallow geologic framework, geomorphic evolution, and sand resources of a paleo-barrier shoreline, Terrebonne Bay, Louisiana, USA. [Internet] [Thesis]. Tulane University; 2018. [cited 2021 Apr 18].
Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:78565.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Culling D. Shallow geologic framework, geomorphic evolution, and sand resources of a paleo-barrier shoreline, Terrebonne Bay, Louisiana, USA. [Thesis]. Tulane University; 2018. Available from: https://digitallibrary.tulane.edu/islandora/object/tulane:78565
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Queens University
5.
Rentz, Amy.
Field Performance of Exposed Geosynthetic Composite Liner Systems
.
Degree: Civil Engineering, 2015, Queens University
URL: http://hdl.handle.net/1974/13380
► Geosynthetic clay liners (GCL) overlain by a geomembrane (GMB) in a geosynthetic composite liner system in landfill liner and other waste containment applications can be…
(more)
▼ Geosynthetic clay liners (GCL) overlain by a geomembrane (GMB) in a geosynthetic composite liner system in landfill liner and other waste containment applications can be left exposed for weeks, months, or in some extreme cases, even years. Three known consequences of leaving a GMB-GCL composite liner system uncovered, namely geomembrane wrinkling, GCL panel shrinkage, and more recently down-slope erosion of bentonite from a GCL are investigated in a second field experiment at the Queen’s University Environmental Liner Test Site (QUELTS II).
Wrinkles were quantified for black and high albedo white high-density polyethylene geomembranes (both smooth and textured). Relative to the black geomembrane, wrinkles in the white geomembrane formed later in the morning and reduced sooner in the evening. Wrinkles in the white geomembrane relative to the black were less frequent, smaller in height, and had much shorter maximum interconnected lengths.
GCL panel shrinkage and solar-driven down-slope bentonite erosion were quantified for four GCLs (two powdered bentonite GCLs, one polymer enhanced bentonite GCL, and one multicomponent GCL with a polymer coating installed coating up) left covered only by a black geomembrane, and for one GCL (containing fine-grained granular bentonite) left covered by a black geomembrane, white geomembrane, or 0.3 m of gravel cover.
All GCLs experienced some overlap reduction except the GCL covered by gravel, although no loss of panel overlap occurred during 28 months of monitoring. If immediate cover is not possible, the choice of GCL type and the use of a white geomembrane can result in slower shrinkage rates.
In addition to timely covering, GCL selection can reduce bentonite susceptibility to down-slope erosion. The polymer coated GCL (coating up) was found to be the most resistant to down-slope erosion, while the polymer enhanced and powdered bentonite GCLs were all far more resistant to erosion than the fine-grained granular bentonite GCL, although no erosion features with bentonite loss were detected on any GCL within the first seven weeks of exposure following the May 2012 construction. The use of a white geomembrane reduces the thermal effects on the composite liner, but ultimately did not prevent solar-driven down-slope bentonite erosion.
Subjects/Keywords: Barrier systems
;
Geosynthetics
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APA ·
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APA (6th Edition):
Rentz, A. (2015). Field Performance of Exposed Geosynthetic Composite Liner Systems
. (Thesis). Queens University. Retrieved from http://hdl.handle.net/1974/13380
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Rentz, Amy. “Field Performance of Exposed Geosynthetic Composite Liner Systems
.” 2015. Thesis, Queens University. Accessed April 18, 2021.
http://hdl.handle.net/1974/13380.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Rentz, Amy. “Field Performance of Exposed Geosynthetic Composite Liner Systems
.” 2015. Web. 18 Apr 2021.
Vancouver:
Rentz A. Field Performance of Exposed Geosynthetic Composite Liner Systems
. [Internet] [Thesis]. Queens University; 2015. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1974/13380.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Rentz A. Field Performance of Exposed Geosynthetic Composite Liner Systems
. [Thesis]. Queens University; 2015. Available from: http://hdl.handle.net/1974/13380
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
6.
Sunday, Joyce Chinonso.
Ontogeny of Matrix Metalloproteinases (MMP-2, 8, 9 and 13)
and Tissue inhibitors of Metalloproteinases (TIMP-1, 2, 3 and 4) in
Cerebral Cortex of Sheep.
Degree: Department of Molecular Pharmacology, Physiology and
Biotechnology, 2018, Brown University
URL: https://repository.library.brown.edu/studio/item/bdr:792877/
► Matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs) are essential for ECM remodeling and the development of the blood-brain barrier. Studies suggest that MMPs…
(more)
▼ Matrix metalloproteinases (MMPs) and tissue inhibitors
of metalloproteinases (TIMPs) are essential for ECM remodeling and
the development of the blood-brain
barrier. Studies suggest that
MMPs and TIMPs play a significant role in neurogenesis, brain
maturation and degradation of extracellular matrix proteins. The
goal of this study is to determine the ontogenic pattern of MMP-2,
MMP-8, MMP-9, MMP-13, TIMP-1, TIMP-2, TIMP-3 and TIMP-4 in the
cerebral cortex fetal, newborn and adult sheep. Western immunoblot
was used to measure MMPs and TIMPs in cerebral cortices of fetuses
at 60%, 80%, and 90% of gestation, in newborn and adult sheep.
MMP-2 and MMP-9 activity and expression exhibited ontogenic
increases, whereas MMP-8 did not display the same pattern of
expression. The protein expression of MMP-13 was higher (P<0.05)
in newborn and adult sheep than in fetal sheep at 60% and 70% of
gestation. TIMPs 1 and 3 did not show quantitate changes during
maturation. TIMP-2 expression was lowest in fetuses at 60%
gestation, whereas TIMP-4 was higher during early fetal gestation.
The findings suggest the important role of MMPs and TIMPs in
neuronal differentiation and brain remodeling during development.
This study will provide basis for future exploration into the role
of MMPs and TIMPs in the brain during development and perinatal
brain injury.
Advisors/Committee Members: Zielinski-Habershaw, Beth (Reader), Chen, Xiaodi (Reader), Stonestreet, Barbara (Advisor).
Subjects/Keywords: Blood-brain barrier
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APA ·
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Export
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APA (6th Edition):
Sunday, J. C. (2018). Ontogeny of Matrix Metalloproteinases (MMP-2, 8, 9 and 13)
and Tissue inhibitors of Metalloproteinases (TIMP-1, 2, 3 and 4) in
Cerebral Cortex of Sheep. (Thesis). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:792877/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sunday, Joyce Chinonso. “Ontogeny of Matrix Metalloproteinases (MMP-2, 8, 9 and 13)
and Tissue inhibitors of Metalloproteinases (TIMP-1, 2, 3 and 4) in
Cerebral Cortex of Sheep.” 2018. Thesis, Brown University. Accessed April 18, 2021.
https://repository.library.brown.edu/studio/item/bdr:792877/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sunday, Joyce Chinonso. “Ontogeny of Matrix Metalloproteinases (MMP-2, 8, 9 and 13)
and Tissue inhibitors of Metalloproteinases (TIMP-1, 2, 3 and 4) in
Cerebral Cortex of Sheep.” 2018. Web. 18 Apr 2021.
Vancouver:
Sunday JC. Ontogeny of Matrix Metalloproteinases (MMP-2, 8, 9 and 13)
and Tissue inhibitors of Metalloproteinases (TIMP-1, 2, 3 and 4) in
Cerebral Cortex of Sheep. [Internet] [Thesis]. Brown University; 2018. [cited 2021 Apr 18].
Available from: https://repository.library.brown.edu/studio/item/bdr:792877/.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sunday JC. Ontogeny of Matrix Metalloproteinases (MMP-2, 8, 9 and 13)
and Tissue inhibitors of Metalloproteinases (TIMP-1, 2, 3 and 4) in
Cerebral Cortex of Sheep. [Thesis]. Brown University; 2018. Available from: https://repository.library.brown.edu/studio/item/bdr:792877/
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Debrecen
7.
Diós, Sándor.
Diffúzió vizsgálata vékonyrétegekben
.
Degree: DE – TEK – Természettudományi és Technológiai Kar – Fizikai Intézet, 2010, University of Debrecen
URL: http://hdl.handle.net/2437/95680
Diplomamunkám folyamán a MgO diffúziós barrier tulajdonságait vizsgáltam. Si/15nmMgO/50nmCu, valamint Si/MgO/Cu/ITO(indium-ónoxid) mintákat készítettem magnetronos porlasztással. . A különböző hőmérsékleten hőkezelt minták mélységi profilját szekunder neutrális tömegspektrometria (SNMS) segítségével mértem.
Advisors/Committee Members: Langer, Gábor (advisor).Subjects/Keywords: diffúzió;
barrier;
SNMS
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APA (6th Edition):
Diós, S. (2010). Diffúzió vizsgálata vékonyrétegekben
. (Thesis). University of Debrecen. Retrieved from http://hdl.handle.net/2437/95680
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Diós, Sándor. “Diffúzió vizsgálata vékonyrétegekben
.” 2010. Thesis, University of Debrecen. Accessed April 18, 2021.
http://hdl.handle.net/2437/95680.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Diós, Sándor. “Diffúzió vizsgálata vékonyrétegekben
.” 2010. Web. 18 Apr 2021.
Vancouver:
Diós S. Diffúzió vizsgálata vékonyrétegekben
. [Internet] [Thesis]. University of Debrecen; 2010. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/2437/95680.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Diós S. Diffúzió vizsgálata vékonyrétegekben
. [Thesis]. University of Debrecen; 2010. Available from: http://hdl.handle.net/2437/95680
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Pretoria
8.
Ngoepe, P.N.M. (Phuti Ngako Mahloka).
Optoelectronic characterisation of AlGaN based Schottky
barrier diodes
.
Degree: 2013, University of Pretoria
URL: http://upetd.up.ac.za/thesis/available/etd-05222013-135333/
► Recent advances in growth techniques have lead to the production of high quality GaN and this has played a vital role in the improvement of…
(more)
▼ Recent advances in growth techniques have lead to
the production of high quality GaN and this has played a vital role
in the improvement of GaN based devices. A number of device types
can be produced from GaN. Spectrally selective devices can be
produced by creating ternary or quaternary material systems by
partially substituting either Al or In for Ga in GaN. This allows a
wide spectral range that can be achieved ranging from the visible
to the ultraviolet. The applications of detectors based on these
material systems are vast and include areas such as biological,
military, environmental, industrial and scientific spheres. In
front illuminated Schottky
barrier photodetectors, two major
factors influencing the sensitivity of the device are the reverse
leakage current and the transparency of the Schottky contact. In
order to reduce the reverse current of semiconductor based devices,
increase the
barrier height, and enhance the adhesion of a metal on
a semiconductor it is important to
subject the contact to
annealing. Annealing studies have been performed on AlGaN based
photodiodes to investigate the evolution of the optical and
electrical properties. In this study, the electrical and optical
characteristics of AlGaN based Ni/Au and Ni/Ir/Au Schottky
photodiodes were investigated. The electrical properties of the
photodiodes were optimised by annealing in an Ar ambient. An
increase in the Schottky
barrier height and a decrease in the
reverse leakage current were observed with increasing annealing
temperature up to 500 °C. This effect was observed for both the
Ni/Au and Ni/Ir/Au photodiodes. The optical characteristics of the
photodiodes, which include the responsivity and the quantum
efficiency, were also investigated. UV/visible rejection ratios of
as high as 103 were obtained. The transmittance of Ni/Au and
Ni/Ir/Au metal layers deposited on a quartz substrate were
optimised by annealing. This was under the same ambient conditions
as the Schottky photodiode. The transmittance increased with
annealing temperature for the Ni/Au metal layer whereas it
decreased at higher temperatures for the Ni/Ir/Au layer. The
transmittance of the Ni/Au metal layer reached as high as 85 %
after 500 °C annealing. The transmittance of the Ni/Ir/Au only
reached a high of 41 % after 400 °C annealing.
Advisors/Committee Members: Meyer, W.E. (Walter Ernst) (advisor), Diale, M. (Mmantsae Moche) (advisor).
Subjects/Keywords: Algan;
Schottky barrier diodes;
UCTD
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APA ·
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to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Ngoepe, P. N. M. (. N. M. (2013). Optoelectronic characterisation of AlGaN based Schottky
barrier diodes
. (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-05222013-135333/
Chicago Manual of Style (16th Edition):
Ngoepe, P N M (Phuti Ngako Mahloka). “Optoelectronic characterisation of AlGaN based Schottky
barrier diodes
.” 2013. Masters Thesis, University of Pretoria. Accessed April 18, 2021.
http://upetd.up.ac.za/thesis/available/etd-05222013-135333/.
MLA Handbook (7th Edition):
Ngoepe, P N M (Phuti Ngako Mahloka). “Optoelectronic characterisation of AlGaN based Schottky
barrier diodes
.” 2013. Web. 18 Apr 2021.
Vancouver:
Ngoepe PNM(NM. Optoelectronic characterisation of AlGaN based Schottky
barrier diodes
. [Internet] [Masters thesis]. University of Pretoria; 2013. [cited 2021 Apr 18].
Available from: http://upetd.up.ac.za/thesis/available/etd-05222013-135333/.
Council of Science Editors:
Ngoepe PNM(NM. Optoelectronic characterisation of AlGaN based Schottky
barrier diodes
. [Masters Thesis]. University of Pretoria; 2013. Available from: http://upetd.up.ac.za/thesis/available/etd-05222013-135333/
University of Utah
9.
Booth, Ross Hunter.
A microfluidic in vitro model of the blood-brain barrier.
Degree: PhD, Bioengineering, 2014, University of Utah
URL: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3355/rec/53
► The blood-brain barrier (BBB) limits entry of most molecules into the brain and complicates the development of brain-targeting compounds, necessitating novel BBB models. This dissertation…
(more)
▼ The blood-brain barrier (BBB) limits entry of most molecules into the brain and complicates the development of brain-targeting compounds, necessitating novel BBB models. This dissertation describes the first microfluidic BBB model allowing the study of BBB properties in relation to various chemical compounds by enabling tunable wall shear stress (WSS) via dynamic fluid flow, cell-cell interaction through a thin co-culture membrane, time-dependent delivery of test compounds, and integration of sensors into the system, resulting in significant reduction of reagents and cells required and shorter cell seeding time. Use of parallel channels first enabled simultaneous monitoring of multiple cell populations under a wide range (~x15) of WSS.The microfluidic model formed the BBB by incorporating brain endothelial (b.End3) and glial (C6/C8D1A) cells at the intersection of two crossing microchannels, respectively representing luminal and abluminal sides, fabricated in a transparent polydimethylsiloxane (PDMS) substrate utilizing high-precision soft lithography techniques. The utilized cells were adopted from immortalized cells for high consistency over repeated passages and pure and proliferative culture.The developed microfluidic BBB model was validated by (1) expression of tight junction protein ZO-1 and glial protein GFAP by fluorescence imaging, and P-gp activity by Calcein AM, confirming key BBB proteins; (2) high trans-endothelial electrical resistance (TEER) of co-cultures exceeding 250Ωcm2 confirming sufficiently contiguous cell layer formation; (3) chemically-induced barrier modulation, with transient TEER loss by 150μM histamine (~50% for 8-15min), and increase in permeability at elevated pH (10.0); (4) size-dependent (668-70,000Da) compound permeability mimicking in vivo trends; and (5) highly linear correlation (R2>0.85) of clearance rates of seven selected neural drugs with in vivo brain/plasma ratios. We demonstrated the effects of WSS (0-86dyn/cm2) on bEnd.3 properties under increasing WSS, including increase in (6) TEER, (7) cell re-alignment toward flow direction, and (8) protein expression of ZO-1/P-gp, and (9) decrease in tracer permeability.The developed in vitro microfluidic BBB model provides distinct advantages for monitoring and modulating barrier functions and prediction of compound permeability. Thus, it would provide an innovative platform to study mechanisms and pathology of barrier function as well as to assess novel pharmaceuticals early in development for their BBB clearance capabilities.
Subjects/Keywords: Blood-brain barrier; MEMS; Microfluidic
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APA (6th Edition):
Booth, R. H. (2014). A microfluidic in vitro model of the blood-brain barrier. (Doctoral Dissertation). University of Utah. Retrieved from http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3355/rec/53
Chicago Manual of Style (16th Edition):
Booth, Ross Hunter. “A microfluidic in vitro model of the blood-brain barrier.” 2014. Doctoral Dissertation, University of Utah. Accessed April 18, 2021.
http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3355/rec/53.
MLA Handbook (7th Edition):
Booth, Ross Hunter. “A microfluidic in vitro model of the blood-brain barrier.” 2014. Web. 18 Apr 2021.
Vancouver:
Booth RH. A microfluidic in vitro model of the blood-brain barrier. [Internet] [Doctoral dissertation]. University of Utah; 2014. [cited 2021 Apr 18].
Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3355/rec/53.
Council of Science Editors:
Booth RH. A microfluidic in vitro model of the blood-brain barrier. [Doctoral Dissertation]. University of Utah; 2014. Available from: http://content.lib.utah.edu/cdm/singleitem/collection/etd3/id/3355/rec/53
University of California – San Diego
10.
Sun, Chang.
Using California Reanalysis Downscaling at 10 km to Identify the Sierra Barrier Jet and Its Variability since 1950.
Degree: Earth Sciences, 2016, University of California – San Diego
URL: http://www.escholarship.org/uc/item/5qv5v5x9
► The Sierra Barrier Jet (SBJ) is a low-level jet that flows parallel to the west slope of the Sierra Nevada and affects precipitation in California…
(more)
▼ The Sierra Barrier Jet (SBJ) is a low-level jet that flows parallel to the west slope of the Sierra Nevada and affects precipitation in California during cool seasons (October to April). This study begins by evaluating the ability of California Reanalysis Downscaling at 10 km (CaRD10) to identify the SBJ by comparison to wind profiler measurements available during cool seasons from 2000 to 2010. After adjusting thresholds for SBJ identification to account for a weak negative bias in CaRD10 Sierra-parallel component (~2m s-1), comparison with observed wind profiler data at Chico demonstrates that CaRD10 performs quite well at detecting strong wind speed and long duration SBJ events that are accompanied with substantial precipitation. And CaRD10 is demonstrated to reproduce seasonal cycle and interannual variability well.Then CaRD10 is used to study the climatological variability of SBJs from 1950 to 2012 during the cool season. Although large variations among cool season months, the magnitudes of maximum Sierra-parallel component of flow are similar. Total precipitation over an individual cool season in the region north of the Central Valley is greater for those years with a greater number of SBJ events. Although experiencing substantial year-to-year variability, the average duration of SBJ events and the daily precipitation amount associated with SBJ events do exhibit statistically significant increasing trends. With simple investigation on the linkages of SBJs with (El Nino-Southern Oscillation) ENSO and Pacific Decadal Oscillation (PDO), no significant relationships are found.
Subjects/Keywords: Meteorology; California; Sierra Barrier Jet
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APA (6th Edition):
Sun, C. (2016). Using California Reanalysis Downscaling at 10 km to Identify the Sierra Barrier Jet and Its Variability since 1950. (Thesis). University of California – San Diego. Retrieved from http://www.escholarship.org/uc/item/5qv5v5x9
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Sun, Chang. “Using California Reanalysis Downscaling at 10 km to Identify the Sierra Barrier Jet and Its Variability since 1950.” 2016. Thesis, University of California – San Diego. Accessed April 18, 2021.
http://www.escholarship.org/uc/item/5qv5v5x9.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Sun, Chang. “Using California Reanalysis Downscaling at 10 km to Identify the Sierra Barrier Jet and Its Variability since 1950.” 2016. Web. 18 Apr 2021.
Vancouver:
Sun C. Using California Reanalysis Downscaling at 10 km to Identify the Sierra Barrier Jet and Its Variability since 1950. [Internet] [Thesis]. University of California – San Diego; 2016. [cited 2021 Apr 18].
Available from: http://www.escholarship.org/uc/item/5qv5v5x9.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Sun C. Using California Reanalysis Downscaling at 10 km to Identify the Sierra Barrier Jet and Its Variability since 1950. [Thesis]. University of California – San Diego; 2016. Available from: http://www.escholarship.org/uc/item/5qv5v5x9
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Oregon State University
11.
Mather, Andrea (Andrea Jae).
Wheeled Mobility Devices Performance and Passive Securement Systems.
Degree: MS, Civil Engineering, 2016, Oregon State University
URL: http://hdl.handle.net/1957/58558
► Wheeled mobility devices (WhMD) pose unique safety risks to users while riding public transportation. Unsecured or improperly secured WhMDs create safety concerns for other transit…
(more)
▼ Wheeled mobility devices (WhMD) pose unique safety risks to users while riding public transportation. Unsecured or improperly secured WhMDs create safety concerns for other transit riders and operators. Tests using accelerometers and visual observations were conducted to understand how WhMD orientation and securement in articulated buses, streetcars, and light rail vehicles. These tests used manual wheelchairs and lightweight scooters. The rail study focuses on WhMD orientation. The rail research activity determined that longitudinal and side facing orientation for WhMD performed similarly but due to other on board safety factors longitudinal is the safer option. The bus study focused on the combination of vertical and horizontal roadway curvature and the effect on a rear facing passive containment system. The research determined that the passive rear facing containment system was appropriate when drivers maintained trained operating speed or lower while traversing the complex curvature.
Advisors/Committee Members: Hunter-Zaworski, Katharine (advisor), Bell, Chris (committee member).
Subjects/Keywords: Local transit – Barrier-free design
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APA (6th Edition):
Mather, A. (. J. (2016). Wheeled Mobility Devices Performance and Passive Securement Systems. (Masters Thesis). Oregon State University. Retrieved from http://hdl.handle.net/1957/58558
Chicago Manual of Style (16th Edition):
Mather, Andrea (Andrea Jae). “Wheeled Mobility Devices Performance and Passive Securement Systems.” 2016. Masters Thesis, Oregon State University. Accessed April 18, 2021.
http://hdl.handle.net/1957/58558.
MLA Handbook (7th Edition):
Mather, Andrea (Andrea Jae). “Wheeled Mobility Devices Performance and Passive Securement Systems.” 2016. Web. 18 Apr 2021.
Vancouver:
Mather A(J. Wheeled Mobility Devices Performance and Passive Securement Systems. [Internet] [Masters thesis]. Oregon State University; 2016. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1957/58558.
Council of Science Editors:
Mather A(J. Wheeled Mobility Devices Performance and Passive Securement Systems. [Masters Thesis]. Oregon State University; 2016. Available from: http://hdl.handle.net/1957/58558
University of Manchester
12.
Lee, Kuan-I.
Volcanic Ash Degradation on Thermal Barrier Coatings and
Preliminary Fabrication of Protective Coatings.
Degree: 2014, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:237168
► Thermal barrier coatings (TBCs) made of yttria stabilized zirconia (YSZ) have been applied to aero engines industry since 1970s. However, because of the increasing operational…
(more)
▼ Thermal barrier coatings (TBCs) made of yttria
stabilized zirconia (YSZ) have been applied to aero engines
industry since 1970s. However, because of the increasing
operational temperature, TBCs are suffering from molten foreign
deposits known as calcium-magnesium-alumino-silicate (CMAS). Molten
CMAS sinters YSZ top coat and shortens the lifetime of TBCs.
Alumina has been widely proved to prevent CMAS from degradation and
is the most common material chosen to avert a CMAS attack in
state-of-the-art TBC technology.This study uses real volcanic ash
to study the degradation process of TBCs and potential mitigation
mechanisms. The results show that, similar to CMAS, volcanic ash
severely penetrates the thickness and fills the columnar gaps of
the TBC top coat. It is also found that the yttria content of the
YSZ top coat decreases substantially with high temperature exposure
to volcanic ash, which has a detrimental effect on the phase
stability of YSZ. In terms of mitigation, volcanic ash reacts with
alumina around 1310 °C, forming anorthite (CaAl2Si2O8), magnetite
(Fe3O4), and spinel (Al1.75Mg0.889Mn0.351O4) as reactive products,
which, according to the literature, have melting temperatures above
that of the volcanic ash studied and the typical values reported
for CMAS. Since the new melting temperatures are now above the
typical surface operating temperature of turbine components, the
melting-induced penetration of volcanic ash and CMAS can be
considerably suppressed.For the protective coatings, both YSZ and
Al2O3 could be made by using sol-gel based spray coating. However,
different grade of thermal expansion between TBC layers and
protective coating during heat treatment will break the structure
of protective coating which is needed to be conquered in the
future.
n/a
figures, tables (inside of text)
Advisors/Committee Members: Xiao, Ping.
Subjects/Keywords: Thermal barrier coatings; volcanic ash
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Manager
APA (6th Edition):
Lee, K. (2014). Volcanic Ash Degradation on Thermal Barrier Coatings and
Preliminary Fabrication of Protective Coatings. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:237168
Chicago Manual of Style (16th Edition):
Lee, Kuan-I. “Volcanic Ash Degradation on Thermal Barrier Coatings and
Preliminary Fabrication of Protective Coatings.” 2014. Doctoral Dissertation, University of Manchester. Accessed April 18, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:237168.
MLA Handbook (7th Edition):
Lee, Kuan-I. “Volcanic Ash Degradation on Thermal Barrier Coatings and
Preliminary Fabrication of Protective Coatings.” 2014. Web. 18 Apr 2021.
Vancouver:
Lee K. Volcanic Ash Degradation on Thermal Barrier Coatings and
Preliminary Fabrication of Protective Coatings. [Internet] [Doctoral dissertation]. University of Manchester; 2014. [cited 2021 Apr 18].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:237168.
Council of Science Editors:
Lee K. Volcanic Ash Degradation on Thermal Barrier Coatings and
Preliminary Fabrication of Protective Coatings. [Doctoral Dissertation]. University of Manchester; 2014. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:237168
Texas A&M University
13.
Rentschlar, Elizabeth.
Quantifying Vegetation Recovery on Santa Rosa Island.
Degree: MS, Geography, 2014, Texas A&M University
URL: http://hdl.handle.net/1969.1/153883
► The rate of recovery on barrier islands after hurricanes is not well understood, because the majority of studies have focused on the geomorphic impact of…
(more)
▼ The rate of recovery on
barrier islands after hurricanes is not well understood, because the majority of studies have focused on the geomorphic impact of storms on
barrier islands. Dune vegetation recovery is a vital component of
barrier island recovery because it promotes the deposition of the sand required for dune stabilization. Despite a paucity of studies that quantitatively characterize vegetation recovery following hurricanes, Escambia County, Florida, was advised to spend nearly half a million dollars on revegetation efforts following relatively minor damage during the 1998 hurricane cycle. This research seeks to better understand that process by quantifying changes in vegetation extent between 1994 and 2010 on Santa Rosa Island, Florida following Hurricanes Opal and Ivan. Multispectral airborne imagery is used to analyze vegetation patterns and recovery. If no vegetation is present, sediment will not be deposited consistently. The clumps of plants collect sand in their wind shadows that grow and merge to create dunes. Changing patterns of vegetation distribution over time are examined in a geographic information system. The Verhulst logistic growth model is used to describe post-hurricane vegetation recovery. The logistic growth models results indicate that given twenty-five years of observed data, vegetation recovery occurs in approximately ten years on the Fort Pickens portion of the island and after fifteen years on the Santa Rosa Island portion of the island. The Verhulst model reveals that vegetation growth rates (r) are higher in the overwashed transects. This is most likely the result of variations in the plant species found in an overwashed transect. The transects in which vegetation spread to a greater portion of the transect (K) were more commonly collision dominated. This was probably because greater portions of these transects were less vulnerable to disturbance from run-up. Results suggest that there is a time lag between beach recovery and dune recovery that can be explained by vegetation recovery. This scale dependence will be affected by high-magnitude, high-frequency disturbances because it increases the chance that the vegetation will not have recovered before the next disturbance event thereby changing the dominant geomorphic regime. Fourier transformation reveals that there was an alongshore variation in the vegetation coverage before and after Hurricanes Opal and Ivan that corresponds to the frequencies of the ridge and swale bathymetry, around 1400 meters.
Advisors/Committee Members: Houser, Chris (advisor), Cairns, David (committee member), Feagin, Rusty (committee member).
Subjects/Keywords: barrier island; vegetation recovery
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APA (6th Edition):
Rentschlar, E. (2014). Quantifying Vegetation Recovery on Santa Rosa Island. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/153883
Chicago Manual of Style (16th Edition):
Rentschlar, Elizabeth. “Quantifying Vegetation Recovery on Santa Rosa Island.” 2014. Masters Thesis, Texas A&M University. Accessed April 18, 2021.
http://hdl.handle.net/1969.1/153883.
MLA Handbook (7th Edition):
Rentschlar, Elizabeth. “Quantifying Vegetation Recovery on Santa Rosa Island.” 2014. Web. 18 Apr 2021.
Vancouver:
Rentschlar E. Quantifying Vegetation Recovery on Santa Rosa Island. [Internet] [Masters thesis]. Texas A&M University; 2014. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1969.1/153883.
Council of Science Editors:
Rentschlar E. Quantifying Vegetation Recovery on Santa Rosa Island. [Masters Thesis]. Texas A&M University; 2014. Available from: http://hdl.handle.net/1969.1/153883
McMaster University
14.
Patel, Jay P.
CHARACTERIZING THE ROLE OF BLOOD BRAIN BARRIER DISRUPTION IN BIPOLAR DISORDER.
Degree: MSc, 2016, McMaster University
URL: http://hdl.handle.net/11375/20438
► Bipolar disorder (BD), previously known as manic depressive disorder, is associated with recurring episodes of depression and mania/hypomania. Currently, no definitive biological mechanisms have been…
(more)
▼ Bipolar disorder (BD), previously known as manic depressive disorder, is associated with recurring episodes of depression and mania/hypomania. Currently, no definitive biological mechanisms have been pinpointed with regards to the origin and progression of BD, however, inflammation and oxidative stress have been shown to present in the brains of individuals with BD. Notably, other neurodegenerative disorders which also contain an inflammatory component including Alzheimer’s disease and Multiple Sclerosis display with disruption of the brain blood barrier (BBB). We thus propose a model of BD wherein BBB disruption facilitates inflammation and oxidative stress induced neural damage.
This study looked to utilize amphetamine (AMPH) induced mania model and lipopolysaccharide (LPS) induced inflammatory model to represent BD like conditions in rats and to assess BBB permeability. We observed elevated locomotor data in response to AMPH administration and a trend of increased BBB permeability across regions following low dose chronic AMPH injections. In the LPS induced BBB permeability model, we did not detect any elevated serum C-reactive protein (CRP) or tumour necrosis factor alpha (TNF-α) levels but did see significantly elevated BBB permeability in the LPS group and lithium pre-treatment providing some protection against BBB permeability in one of our cohorts. These trends were further corroborated by a follow-up study and thus
warrant further investigation into the mechanistic nature of BBB breakdown in this model. This may provide a breakthrough in understanding the pathophysiology of BD and the underlying mechanistic effects of lithium, paving the way for new more target therapeutic remedies to combat this debilitating disorder.
Thesis
Master of Science (MSc)
Advisors/Committee Members: Frey, Benicio N., Neuroscience.
Subjects/Keywords: bipolar disorder; blood brain barrier
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APA (6th Edition):
Patel, J. P. (2016). CHARACTERIZING THE ROLE OF BLOOD BRAIN BARRIER DISRUPTION IN BIPOLAR DISORDER. (Masters Thesis). McMaster University. Retrieved from http://hdl.handle.net/11375/20438
Chicago Manual of Style (16th Edition):
Patel, Jay P. “CHARACTERIZING THE ROLE OF BLOOD BRAIN BARRIER DISRUPTION IN BIPOLAR DISORDER.” 2016. Masters Thesis, McMaster University. Accessed April 18, 2021.
http://hdl.handle.net/11375/20438.
MLA Handbook (7th Edition):
Patel, Jay P. “CHARACTERIZING THE ROLE OF BLOOD BRAIN BARRIER DISRUPTION IN BIPOLAR DISORDER.” 2016. Web. 18 Apr 2021.
Vancouver:
Patel JP. CHARACTERIZING THE ROLE OF BLOOD BRAIN BARRIER DISRUPTION IN BIPOLAR DISORDER. [Internet] [Masters thesis]. McMaster University; 2016. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/11375/20438.
Council of Science Editors:
Patel JP. CHARACTERIZING THE ROLE OF BLOOD BRAIN BARRIER DISRUPTION IN BIPOLAR DISORDER. [Masters Thesis]. McMaster University; 2016. Available from: http://hdl.handle.net/11375/20438
University of Newcastle
15.
Spadari, Michele.
Experimental and numerical investigations on barriers for rockfall hazard mitigation.
Degree: PhD, 2013, University of Newcastle
URL: http://hdl.handle.net/1959.13/1038004
► Research Doctorate - Doctor of Philosophy (PhD)
Managing the rockfall hazard is a complex task, which involves several phases from land planning to the design…
(more)
▼ Research Doctorate - Doctor of Philosophy (PhD)
Managing the rockfall hazard is a complex task, which involves several phases from land planning to the design of protective structures. Despite the increasing interest in rockfall-related research over the last few decades, some issues remain only partially addressed to date. In particular, existing predictive tools for the simulation of block trajectories could be improved and the criteria for the design of flexible metallic barriers are potentially flawed by block size effects. In the Australian context, the lack of research into rockfall phenomena has prevented the development of a comprehensive hazard characterisation so far; moreover, some types of barriers currently in use present cost-effectiveness issues. In this thesis, formed by six peer-reviewed publications, the aforementioned issues are investigated, with the aim of improving the knowledge regarding rockfall, especially for the Australian environment. The first paper presents the results of extensive in situ tests performed in different geological environments in NSW. Rockfall motion parameters are obtained for the first time in the Australian context and uncommonly high values of the normal coefficient of restitution are highlighted. An investigation of these results is undertaken in the second paper through extensive laboratory testing: low impacting angles, rotational energy and block shape are correlated to the high values of kn obtained in the experiments. In the third paper, the results from in situ tests are applied to real profiles taken from a database of Australian slopes: a basic hazard characterisation is performed using a 2D lumped mass model and low impact energy values are found for most of the cases. The fourth paper shows a comparison between four different flexible barriers, carried out by full-scale laboratory testing. The results provide an insight on the estimation of the barriers’ performance: in particular, stiffness and load transmission are evaluated, and modifications to improve the performance of one of the systems are suggested. Experimental and numerical evidence of the bullet effect are presented in the fifth and sixth papers. A Finite Element model of a mesh panel, calibrated by means of laboratory testing, is used to validate an innovative dimensional approach.
Advisors/Committee Members: University of Newcastle. Faculty of Engineering & Built Environment, School of Engineering.
Subjects/Keywords: rockfall; barrier; hazard; bullet effect
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APA (6th Edition):
Spadari, M. (2013). Experimental and numerical investigations on barriers for rockfall hazard mitigation. (Doctoral Dissertation). University of Newcastle. Retrieved from http://hdl.handle.net/1959.13/1038004
Chicago Manual of Style (16th Edition):
Spadari, Michele. “Experimental and numerical investigations on barriers for rockfall hazard mitigation.” 2013. Doctoral Dissertation, University of Newcastle. Accessed April 18, 2021.
http://hdl.handle.net/1959.13/1038004.
MLA Handbook (7th Edition):
Spadari, Michele. “Experimental and numerical investigations on barriers for rockfall hazard mitigation.” 2013. Web. 18 Apr 2021.
Vancouver:
Spadari M. Experimental and numerical investigations on barriers for rockfall hazard mitigation. [Internet] [Doctoral dissertation]. University of Newcastle; 2013. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1959.13/1038004.
Council of Science Editors:
Spadari M. Experimental and numerical investigations on barriers for rockfall hazard mitigation. [Doctoral Dissertation]. University of Newcastle; 2013. Available from: http://hdl.handle.net/1959.13/1038004
Texas Tech University
16.
Sumbria, Rachita Kuldeep Singh.
Intracerebral microdialysis studies of blood-brain barrier permeability and neurochemical parameters in a murine stroke model.
Degree: PhD, TTUHSC – Pharmaceutical Sciences, 2010, Texas Tech University
URL: http://hdl.handle.net/2346/66921
► Damage to the blood-brain barrier (BBB) secondary to prolonged ischemia and subsequent reperfusion is an important pathological hallmark of ischemia-reperfusion injury resulting in vasogenic edema,…
(more)
▼ Damage to the blood-brain
barrier (BBB) secondary to prolonged ischemia and
subsequent reperfusion is an important pathological hallmark of ischemia-reperfusion
injury resulting in vasogenic edema, hemorrhagic transformation and reduced benefits
offered by reperfusion. Evaluation of the dynamics of BBB opening thus forms the basis
for the development of therapies that can counteract reperfusion induced hyperpermeability
of the BBB. Intracerebral microdialysis is a commonly used in vivo
sampling technique to study the brain tissue biochemistry and pharmacokinetics of drug
uptake by brain, under normal and pathological conditions like cerebral ischemia.
Besides its use for measuring neurochemical changes during and after cerebral ischemia,
we proposed to use this technique to make quantitative estimates of BBB permeability
changes resulting from cerebral ischemia and reperfusion. Hence, studying the BBB
opening following ischemia reperfusion using intracerebral microdialysis constitutes the
central goal of the present dissertation achieved by fulfilling the following objectives: a)
to determine alterations in brain tissue biochemistry and BBB permeability associated
with microdialysis probe implantation, b) to establish a sensitive quantitative
microdialysis model to study the dynamics of BBB opening and c) to investigate the time
frame of BBB opening and neurochemical alterations following ischemia reperfusion, in
a middle cerebral artery occlusion murine stroke model, using intracerebral microdialysis.
Our results demonstrate that a recovery time of 24h post probe implantation is suitable to
initiate microdialysis sampling since by this time tissue damage and BBB disruption caused due to acute probe implantation had declined. Further, using a novel finite
element model approach for simulating transient probe extraction fraction and a brain
pharmacokinetic model based on symmetrical exchange across the BBB by passive
diffusion (PS) and an additional term for clearance from brain extracellular space (Kout
e.g. due to bulk flow), we found a 6 fold increase in the BBB permeability surface area
(PS) product of [14C]sucrose following osmotic opening of the BBB and a 6 fold
difference in the PS of [14C]sucrose and [14C]mannitol across an intact BBB. Following
ischemia reperfusion, the PS product of [14C]sucrose was significantly higher than in
sham-operated animals when measured during intervals 0.25-2h, 4h-6h, 24-26h and 72-
74h, but not 8-10h and 18-20h post ischemia reperfusion, reinforcing the biphasic nature
of BBB opening post ischemia reperfusion. Neurochemical profiling up to 24h post
reperfusion showed that while energy-substrates (glucose and lactate) are normalized 4-
6h post reperfusion, markers of tissue damage (glutamate, glycerol, hydroxyl radical and
nuclear factor kappa B), continue to be elevated up to and beyond this time point,
suggesting their contribution in ischemia reperfusion injury.
The results of this dissertation demonstrate that intracerebral microdialysis is a…
Advisors/Committee Members: Abbruscato, Thomas (committee member), Klein, Jochen (committee member), Mehvar, Reza (committee member), Bickel, Ulrich (Committee Chair).
Subjects/Keywords: Blood-Brain Barrier; Intracerebral Microdialysis
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Manager
APA (6th Edition):
Sumbria, R. K. S. (2010). Intracerebral microdialysis studies of blood-brain barrier permeability and neurochemical parameters in a murine stroke model. (Doctoral Dissertation). Texas Tech University. Retrieved from http://hdl.handle.net/2346/66921
Chicago Manual of Style (16th Edition):
Sumbria, Rachita Kuldeep Singh. “Intracerebral microdialysis studies of blood-brain barrier permeability and neurochemical parameters in a murine stroke model.” 2010. Doctoral Dissertation, Texas Tech University. Accessed April 18, 2021.
http://hdl.handle.net/2346/66921.
MLA Handbook (7th Edition):
Sumbria, Rachita Kuldeep Singh. “Intracerebral microdialysis studies of blood-brain barrier permeability and neurochemical parameters in a murine stroke model.” 2010. Web. 18 Apr 2021.
Vancouver:
Sumbria RKS. Intracerebral microdialysis studies of blood-brain barrier permeability and neurochemical parameters in a murine stroke model. [Internet] [Doctoral dissertation]. Texas Tech University; 2010. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/2346/66921.
Council of Science Editors:
Sumbria RKS. Intracerebral microdialysis studies of blood-brain barrier permeability and neurochemical parameters in a murine stroke model. [Doctoral Dissertation]. Texas Tech University; 2010. Available from: http://hdl.handle.net/2346/66921
University of Pretoria
17.
Ngoepe, P.N.M. (Phuti Ngako
Mahloka).
Optoelectronic
characterisation of AlGaN based Schottky barrier diodes.
Degree: Physics, 2013, University of Pretoria
URL: http://hdl.handle.net/2263/24890
► Recent advances in growth techniques have lead to the production of high quality GaN and this has played a vital role in the improvement of…
(more)
▼ Recent advances in growth techniques have lead to the
production of high quality GaN and this has played a vital role in
the improvement of GaN based devices. A number of device types can
be produced from GaN. Spectrally selective devices can be produced
by creating ternary or quaternary material systems by partially
substituting either Al or In for Ga in GaN. This allows a wide
spectral range that can be achieved ranging from the visible to the
ultraviolet. The applications of detectors based on these material
systems are vast and include areas such as biological, military,
environmental, industrial and scientific spheres. In front
illuminated Schottky
barrier photodetectors, two major factors
influencing the sensitivity of the device are the reverse leakage
current and the transparency of the Schottky contact. In order to
reduce the reverse current of semiconductor based devices, increase
the
barrier height, and enhance the adhesion of a metal on a
semiconductor it is important to
subject the contact to annealing.
Annealing studies have been performed on AlGaN based photodiodes to
investigate the evolution of the optical and electrical properties.
In this study, the electrical and optical characteristics of AlGaN
based Ni/Au and Ni/Ir/Au Schottky photodiodes were investigated.
The electrical properties of the photodiodes were optimised by
annealing in an Ar ambient. An increase in the Schottky
barrier
height and a decrease in the reverse leakage current were observed
with increasing annealing temperature up to 500 °C. This effect was
observed for both the Ni/Au and Ni/Ir/Au photodiodes. The optical
characteristics of the photodiodes, which include the responsivity
and the quantum efficiency, were also investigated. UV/visible
rejection ratios of as high as 103 were obtained. The transmittance
of Ni/Au and Ni/Ir/Au metal layers deposited on a quartz substrate
were optimised by annealing. This was under the same ambient
conditions as the Schottky photodiode. The transmittance increased
with annealing temperature for the Ni/Au metal layer whereas it
decreased at higher temperatures for the Ni/Ir/Au layer. The
transmittance of the Ni/Au metal layer reached as high as 85 %
after 500 °C annealing. The transmittance of the Ni/Ir/Au only
reached a high of 41 % after 400 °C annealing.
Advisors/Committee Members: Meyer, W.E. (Walter Ernst) (advisor), Diale, M. (Mmantsae Moche) (coadvisor).
Subjects/Keywords: Algan; Schottky
barrier diodes;
UCTD
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APA (6th Edition):
Ngoepe, P. N. M. (. N. (2013). Optoelectronic
characterisation of AlGaN based Schottky barrier diodes. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/24890
Chicago Manual of Style (16th Edition):
Ngoepe, P N M (Phuti Ngako. “Optoelectronic
characterisation of AlGaN based Schottky barrier diodes.” 2013. Masters Thesis, University of Pretoria. Accessed April 18, 2021.
http://hdl.handle.net/2263/24890.
MLA Handbook (7th Edition):
Ngoepe, P N M (Phuti Ngako. “Optoelectronic
characterisation of AlGaN based Schottky barrier diodes.” 2013. Web. 18 Apr 2021.
Vancouver:
Ngoepe PNM(N. Optoelectronic
characterisation of AlGaN based Schottky barrier diodes. [Internet] [Masters thesis]. University of Pretoria; 2013. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/2263/24890.
Council of Science Editors:
Ngoepe PNM(N. Optoelectronic
characterisation of AlGaN based Schottky barrier diodes. [Masters Thesis]. University of Pretoria; 2013. Available from: http://hdl.handle.net/2263/24890
University of Connecticut
18.
Thistle, Charles H.
Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis.
Degree: MS, Mechanical Engineering, 2011, University of Connecticut
URL: https://opencommons.uconn.edu/gs_theses/156
► The purpose of this research was to examine the primary in-service failure mechanism of an air plasma sprayed thermal barrier coating commonly used in…
(more)
▼ The purpose of this research was to examine the primary in-service failure mechanism of an air plasma sprayed thermal
barrier coating commonly used in combustor applications, and to use that failure mechanism as a basis in developing a life prediction strategy. The research consisted of an experimental phase, in which the failure mechanism was identified and key features of the coating system measured, and a modeling phase, in which the findings of the experimental phase were used to build a system specific finite element model of the coating in order to extract quantitative data relevant to coating life.
Observations were made on multiple thermal
barrier coating samples, consisting of a nickel-based super alloy substrate, a MCrAlY bond coat, a thin layer of thermally grown oxide (TGO) which thickens during service, and an air-plasma sprayed yttria-stabilized zirconia (YSZ) coating.
Growth of the TGO layer, rumpling, and aluminum depletion from the bond coat were modeled using finite element analysis to ascertain the relative importance of each to the development of stress in the coating. It was determined that TGO growth and rumpling have effects on the major trends of stress development, while aluminum depletion has a more minor role. A previously developed viscoplastic constitutive model, specific to thermal
barrier coatings, was employed in the model. From the modeling results, certain inelastic strain output was shown to provide the necessary time and temperature dependent features a damage parameter would need to accurately predict failure lives
Advisors/Committee Members: Maurice Gell, Leon Shaw, Eric H. Jordan.
Subjects/Keywords: Thermal Barrier Coating; TBC
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APA (6th Edition):
Thistle, C. H. (2011). Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis. (Masters Thesis). University of Connecticut. Retrieved from https://opencommons.uconn.edu/gs_theses/156
Chicago Manual of Style (16th Edition):
Thistle, Charles H. “Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis.” 2011. Masters Thesis, University of Connecticut. Accessed April 18, 2021.
https://opencommons.uconn.edu/gs_theses/156.
MLA Handbook (7th Edition):
Thistle, Charles H. “Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis.” 2011. Web. 18 Apr 2021.
Vancouver:
Thistle CH. Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis. [Internet] [Masters thesis]. University of Connecticut; 2011. [cited 2021 Apr 18].
Available from: https://opencommons.uconn.edu/gs_theses/156.
Council of Science Editors:
Thistle CH. Air Plasma Sprayed Thermal Barrier Coatings: Experiments and Finite Element Analysis. [Masters Thesis]. University of Connecticut; 2011. Available from: https://opencommons.uconn.edu/gs_theses/156
University of Oxford
19.
Tobin, Vincent.
Roll-to-roll deposition of highly flexible organic-inorganic barrier layers for printed electronics and photovoltaics.
Degree: PhD, 2018, University of Oxford
URL: http://ora.ox.ac.uk/objects/uuid:d6ea9bcb-171d-4fc6-95e4-51d0e8d4351a
;
https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740991
► This thesis investigates how to improve transparent flexible water vapour barriers by understanding how water permeates through them. The barriers consisted of a reactively sputtered…
(more)
▼ This thesis investigates how to improve transparent flexible water vapour barriers by understanding how water permeates through them. The barriers consisted of a reactively sputtered aluminium oxide coating on an industrial-grade polypropylene substrate. Some also incorporated a di-acrylate smoothing layer. Key deposition conditions were studied and optimised for permeation and visible-light transparency: sputtering power, thickness & sequential deposition rate. One of the main deposition conditions corresponded to increasing coating nitrogen content in order to induce barrier-water interaction. The final investigation consisted of including acrylate layers in different barrier stacking combinations. It was found that thin, high sputter power coatings formed the best barriers to permeation. This was due to denser packing of the oxide and the inclusion of fewer macro-defects (large defects allowing unhindered permeation) and nano-defects (defects small enough to cause the permeant to interact with the coating). No clear benefit to permeation was found from the inclusion of nitrogen, but refractive index was seen to increase and the oxynitride coatings mechanically failed at a greater force than the oxides. This case illustrated the importance of considering the role of permeation through nano-defects: although a high activation energy was achieved for the nitrogen containing films, possibly suggesting greater interaction between the water vapour and the barrier, the amount of permeation was not reduced as the nitrogen gave rise to increased permeation due to nano-defects, thus changing the processing and chemistry can affect both the macro-defect and nano-defect permeation. Smoothing layers were found to reduce the permeation rate by covering large substrate features, thus allowing rough substrates to be used even for high barriers. Although a coating of acrylate on top of a barrier oxide showed no improvement, a 1-2-1-2 stack of smoothing layer (1) and oxide (2) was found to exhibit a large delay in the onset of permeation.
Subjects/Keywords: 620.1; Water permeation; Gas Barrier
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APA (6th Edition):
Tobin, V. (2018). Roll-to-roll deposition of highly flexible organic-inorganic barrier layers for printed electronics and photovoltaics. (Doctoral Dissertation). University of Oxford. Retrieved from http://ora.ox.ac.uk/objects/uuid:d6ea9bcb-171d-4fc6-95e4-51d0e8d4351a ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740991
Chicago Manual of Style (16th Edition):
Tobin, Vincent. “Roll-to-roll deposition of highly flexible organic-inorganic barrier layers for printed electronics and photovoltaics.” 2018. Doctoral Dissertation, University of Oxford. Accessed April 18, 2021.
http://ora.ox.ac.uk/objects/uuid:d6ea9bcb-171d-4fc6-95e4-51d0e8d4351a ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740991.
MLA Handbook (7th Edition):
Tobin, Vincent. “Roll-to-roll deposition of highly flexible organic-inorganic barrier layers for printed electronics and photovoltaics.” 2018. Web. 18 Apr 2021.
Vancouver:
Tobin V. Roll-to-roll deposition of highly flexible organic-inorganic barrier layers for printed electronics and photovoltaics. [Internet] [Doctoral dissertation]. University of Oxford; 2018. [cited 2021 Apr 18].
Available from: http://ora.ox.ac.uk/objects/uuid:d6ea9bcb-171d-4fc6-95e4-51d0e8d4351a ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740991.
Council of Science Editors:
Tobin V. Roll-to-roll deposition of highly flexible organic-inorganic barrier layers for printed electronics and photovoltaics. [Doctoral Dissertation]. University of Oxford; 2018. Available from: http://ora.ox.ac.uk/objects/uuid:d6ea9bcb-171d-4fc6-95e4-51d0e8d4351a ; https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.740991
University of Canterbury
20.
Bull, John Ivan.
Measurement of the airborne sound insulation of traffic noise barriers using impulse response techniques.
Degree: Mechanical Engineering, 2014, University of Canterbury
URL: http://hdl.handle.net/10092/8962
► This research thesis involves the measurement of the airborne sound insulation of road traffic noise barriers, with the goal of gaining a more in depth…
(more)
▼ This research thesis involves the measurement of the airborne sound insulation of road traffic noise barriers, with the goal of gaining a more in depth understanding of the factors that influence noise barrier performance. A measurement system is developed, based on EN 1793-6:2012, to quantify the airborne sound insulation of a noise barrier in situ. Validation testing is performed to ensure that the system meets the requirements of EN 1793-6:2012. MATLAB code is developed, incorporating all of the signal processing tasks into a single graphical user interface. The measurement system is then used to measure the airborne sound insulation of eight existing traffic noise barriers located around Auckland, New Zealand.
The results from the Auckland field tests show that consistent single number ratings of airborne sound insulation can be achieved on different samples of the same noise barrier. The presence of air gaps and hidden defects will degrade the acoustic performance of a noise barrier, most significantly at the high frequencies. The comparison of single number ratings calculated with differing measurement frequency ranges is discussed, and some comments are made on the measurement standard itself.
Subjects/Keywords: noise; barrier; sound insulation
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APA (6th Edition):
Bull, J. I. (2014). Measurement of the airborne sound insulation of traffic noise barriers using impulse response techniques. (Thesis). University of Canterbury. Retrieved from http://hdl.handle.net/10092/8962
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Bull, John Ivan. “Measurement of the airborne sound insulation of traffic noise barriers using impulse response techniques.” 2014. Thesis, University of Canterbury. Accessed April 18, 2021.
http://hdl.handle.net/10092/8962.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Bull, John Ivan. “Measurement of the airborne sound insulation of traffic noise barriers using impulse response techniques.” 2014. Web. 18 Apr 2021.
Vancouver:
Bull JI. Measurement of the airborne sound insulation of traffic noise barriers using impulse response techniques. [Internet] [Thesis]. University of Canterbury; 2014. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10092/8962.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Bull JI. Measurement of the airborne sound insulation of traffic noise barriers using impulse response techniques. [Thesis]. University of Canterbury; 2014. Available from: http://hdl.handle.net/10092/8962
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Royal Roads University
21.
Gillespie, Lorne Andrew William.
Groundwater treatment technologies used to remove or contain radioactive contaminants found in the leachate plumes from waste storage sites at Chalk River Laboratories : a case study
.
Degree: 2017, Royal Roads University
URL: http://hdl.handle.net/10613/4882
► At Chalk River Laboratories (CRL) two remediation technologies are used on one shallow sand trench waste storage area and one abandoned and buried processing plant…
(more)
▼ At Chalk River Laboratories (CRL) two remediation technologies are used on one
shallow sand trench waste storage area and one abandoned and buried processing plant each
containing contaminated groundwater plumes. The first technology is a funnel and gate
permeable reactive barrier (PRB) to filter out strontium-90 from a contaminated groundwater
plume and the second technology is a wall and curtain system installed near the site of an
abandoned ammonium nitrate processing plant also used to remove strontium-90 from the
groundwater. Strontium-90 is a radioactive isotope that is readily taken up through water
absorption and has the capability of travelling long distances through groundwater. This case
study used trends in analysis results and comparisons with other reports and literature regarding
the use of PRBs to assess the two in use at CRL and make recommendations for improvements
to the systems.
Subjects/Keywords: barrier;
groundwater;
plume;
Strontium-90
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APA (6th Edition):
Gillespie, L. A. W. (2017). Groundwater treatment technologies used to remove or contain radioactive contaminants found in the leachate plumes from waste storage sites at Chalk River Laboratories : a case study
. (Thesis). Royal Roads University. Retrieved from http://hdl.handle.net/10613/4882
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Gillespie, Lorne Andrew William. “Groundwater treatment technologies used to remove or contain radioactive contaminants found in the leachate plumes from waste storage sites at Chalk River Laboratories : a case study
.” 2017. Thesis, Royal Roads University. Accessed April 18, 2021.
http://hdl.handle.net/10613/4882.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Gillespie, Lorne Andrew William. “Groundwater treatment technologies used to remove or contain radioactive contaminants found in the leachate plumes from waste storage sites at Chalk River Laboratories : a case study
.” 2017. Web. 18 Apr 2021.
Vancouver:
Gillespie LAW. Groundwater treatment technologies used to remove or contain radioactive contaminants found in the leachate plumes from waste storage sites at Chalk River Laboratories : a case study
. [Internet] [Thesis]. Royal Roads University; 2017. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10613/4882.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Gillespie LAW. Groundwater treatment technologies used to remove or contain radioactive contaminants found in the leachate plumes from waste storage sites at Chalk River Laboratories : a case study
. [Thesis]. Royal Roads University; 2017. Available from: http://hdl.handle.net/10613/4882
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Edinburgh
22.
Chu, Roland Poh Cheong.
Role of filaggrin in skin barrier function and atopic dermatitis.
Degree: PhD, 2012, University of Edinburgh
URL: http://hdl.handle.net/1842/9964
► Loss-of-function mutations in the filaggrin gene(FLG) have recently been shown to be strongly associated with atopic dermatitis (AD). The overall aim of this study was…
(more)
▼ Loss-of-function mutations in the filaggrin gene(FLG) have recently been shown to be strongly associated with atopic dermatitis (AD). The overall aim of this study was to explore the role of filaggrin in skin barrier function and AD. There were two main focuses in this study. The first was a functional study whose primary objective was to determine if FLG mutations correlated with skin barrier dysfunction in AD. Fifty-five mild to moderate AD individuals were recruited, genotyped and had their skin barrier assessed using three different measures - transepidermal water loss (TEWL), skin capacitance and the number of tape strips required to abrogate skin barrier. A secondary aim of this functional study was to test the hypothesis that corneocytes were less adherent to one another in filaggrin-related AD compared to wild-type AD skin. The second main focus of this thesis was a structural study aimed at interrogating the structure-function relationship of filaggrin. Filaggrin protein was extracted and purified from a total of 21 AD and non-AD subjects and analysed using mass spectrometric techniques. Specifically, matrix assisted laser desorption/ionisation time-of-flight(MALDI-TOF)mass spectrometry (MS) and nano liquid chromatography tandem MS(LC-MS/MS) were utilised. Part of this structural study also involved developing and optimising the extraction and purification of filaggrin protein, including a novel way of extracting filaggrin from skin using tape stripping. In addition, novel filaggrin-specific enzyme-linked immunosorbant assay (ELISA) was also developed, which could serve as a useful screening test for the protein. In this study, FLG mutations were found to correlate with higher TEWL and fewer number of tape strips required to abrogate skin barrier, but not with skin capacitance. FLG mutations were also not shown to correlate with AD severity. The mean amount of protein extracted from filaggrin-related AD skin was also significantly higher compared to wild-type AD skin, supporting the hypothesis that corneocytes were less adherent to one another (and therefore, densely packed) in filaggrin-related AD skin. MS analysis of filaggrin confirmed the heterogeneic nature of filaggrin protein, even within a single individual. Interestingly, this structural study also showed that filaggrin was only minimally expressed in the skin of all the AD individuals studied, whether or not they possessed any FLG mutation. Due to the limited amount of filaggrin extracted from AD skin, it was not possible to conduct comparative structural analysis between filaggrin from AD and non-AD skin.
Subjects/Keywords: 616.5; filaggrin; skin barrier; eczema
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Manager
APA (6th Edition):
Chu, R. P. C. (2012). Role of filaggrin in skin barrier function and atopic dermatitis. (Doctoral Dissertation). University of Edinburgh. Retrieved from http://hdl.handle.net/1842/9964
Chicago Manual of Style (16th Edition):
Chu, Roland Poh Cheong. “Role of filaggrin in skin barrier function and atopic dermatitis.” 2012. Doctoral Dissertation, University of Edinburgh. Accessed April 18, 2021.
http://hdl.handle.net/1842/9964.
MLA Handbook (7th Edition):
Chu, Roland Poh Cheong. “Role of filaggrin in skin barrier function and atopic dermatitis.” 2012. Web. 18 Apr 2021.
Vancouver:
Chu RPC. Role of filaggrin in skin barrier function and atopic dermatitis. [Internet] [Doctoral dissertation]. University of Edinburgh; 2012. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/1842/9964.
Council of Science Editors:
Chu RPC. Role of filaggrin in skin barrier function and atopic dermatitis. [Doctoral Dissertation]. University of Edinburgh; 2012. Available from: http://hdl.handle.net/1842/9964
Delft University of Technology
23.
Van der Burgt, L.M. (author).
Infrastructure - Connecting barriers.
Degree: 2014, Delft University of Technology
URL: http://resolver.tudelft.nl/uuid:18b542eb-dbad-4ce6-a27f-12e288875fdc
► Urban design and planning is a profession that requires looking at different scale levels and how these interact with each other. Urban designers or planners…
(more)
▼ Urban design and planning is a profession that requires looking at different scale levels and how these interact with each other. Urban designers or planners often try to connect different areas with each other because they believe that this makes the connected areas stronger. This connection on the large scale is made by large-scale infrastructure. Although large-scale infrastructure can create a connection on the large scale it can do the opposite on the small scale where it act as a barrier, causing problems in the surrounding urban landscape. This project provides a strategic framework to solve this problem. This framework consist out of a generic and a specific part. In the specific a solution is created for the area around the western ring and rail road of Amsterdam. The generic part provides a toolbox with solutions to use in other similar situations.
Urban Regeneration
Urbanism
Architecture and The Built Environment
Advisors/Committee Members: Van der Hoeven, F.D. (mentor), Van Nes, A. (mentor).
Subjects/Keywords: infrastructure; spatial barrier; connections; integration
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APA (6th Edition):
Van der Burgt, L. M. (. (2014). Infrastructure - Connecting barriers. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:18b542eb-dbad-4ce6-a27f-12e288875fdc
Chicago Manual of Style (16th Edition):
Van der Burgt, L M (author). “Infrastructure - Connecting barriers.” 2014. Masters Thesis, Delft University of Technology. Accessed April 18, 2021.
http://resolver.tudelft.nl/uuid:18b542eb-dbad-4ce6-a27f-12e288875fdc.
MLA Handbook (7th Edition):
Van der Burgt, L M (author). “Infrastructure - Connecting barriers.” 2014. Web. 18 Apr 2021.
Vancouver:
Van der Burgt LM(. Infrastructure - Connecting barriers. [Internet] [Masters thesis]. Delft University of Technology; 2014. [cited 2021 Apr 18].
Available from: http://resolver.tudelft.nl/uuid:18b542eb-dbad-4ce6-a27f-12e288875fdc.
Council of Science Editors:
Van der Burgt LM(. Infrastructure - Connecting barriers. [Masters Thesis]. Delft University of Technology; 2014. Available from: http://resolver.tudelft.nl/uuid:18b542eb-dbad-4ce6-a27f-12e288875fdc
Utah State University
24.
Braithwaite, Nathan E.
Laboratory modeling of erosion potential of seepage barrier material.
Degree: MS, Civil and Environmental Engineering, 2013, Utah State University
URL: https://digitalcommons.usu.edu/etd/1493
► Seepage barriers have been used extensively to mitigate seepage problems in dams and levees. Although the designs of many of these dams and levees…
(more)
▼ Seepage barriers have been used extensively to mitigate seepage problems in dams and levees. Although the designs of many of these dams and levees have been based on intact seepage barriers, seepage barriers have been shown to be susceptible to deformation and cracking when high differential hydraulic pressures act across the
barrier. Cracking and deformation have also been observed due to thermal expansion and contraction during seepage
barrier curing. Under certain conditions, a crack can lead to serious seepage problems, which could potentially lead to the development of a low-resistance seepage pathway. Three scenarios have been identified where there is potential for erosion to occur adjacent to a crack in a
barrier: 1) erosion at the interface between a fine-grained soil and a course-grained soil, 2) erosion of overlying soil due to flow along a joint in bedrock, and 3) erosion of the
barrier material itself. Previous studies have investigated the first mode of erosion and studies are underway to look into the second mode. The objective of this study is to investigate the third mode of erosion and to identify the conditions under which serious seepage problems can develop. The question considered was whether the combination of highly permeable material adjacent to a crack in a seepage
barrier and a large differential head across the
barrier combine to develop a velocity within the crack that is erosive to the seepage
barrier material. Laboratory tests have been performed on a variety of seepage
barrier materials to assess the potential for cracks to develop a preferred seepage path leading to a serious seepage problem. The results of this study will be useful in risk assessment studies of dams and levees with existing seepage barriers as well as in the design of new seepage barriers. Having knowledge of the conditions under which problems may occur will aid in the selection of seepage
barrier types for new barriers, placement of instrumentation to monitor new and existing barriers, and mitigation of existing barriers where problems have been identified. The data provided will assist engineers in quantitatively assessing the potential for the propagation of critical seepage problems from cracks in seepage barriers.
Advisors/Committee Members: John D Rice, Joseph A. Caliendo, Paul J. Barr, ;.
Subjects/Keywords: Barrier; Erosion; Seepage; Engineering
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APA (6th Edition):
Braithwaite, N. E. (2013). Laboratory modeling of erosion potential of seepage barrier material. (Masters Thesis). Utah State University. Retrieved from https://digitalcommons.usu.edu/etd/1493
Chicago Manual of Style (16th Edition):
Braithwaite, Nathan E. “Laboratory modeling of erosion potential of seepage barrier material.” 2013. Masters Thesis, Utah State University. Accessed April 18, 2021.
https://digitalcommons.usu.edu/etd/1493.
MLA Handbook (7th Edition):
Braithwaite, Nathan E. “Laboratory modeling of erosion potential of seepage barrier material.” 2013. Web. 18 Apr 2021.
Vancouver:
Braithwaite NE. Laboratory modeling of erosion potential of seepage barrier material. [Internet] [Masters thesis]. Utah State University; 2013. [cited 2021 Apr 18].
Available from: https://digitalcommons.usu.edu/etd/1493.
Council of Science Editors:
Braithwaite NE. Laboratory modeling of erosion potential of seepage barrier material. [Masters Thesis]. Utah State University; 2013. Available from: https://digitalcommons.usu.edu/etd/1493
25.
Seppälä, Juuso.
Kuumailmasaumaus laboratoriossa ja tuotannossa.
Degree: 2019, Theseus
URL: http://www.theseus.fi/handle/10024/263922
► Opinnäytetyön teoriaosuudessa on käsitelty kuppikartonkia, sen rakennetta ja vaatimuksia. Lisäksi osuudessa on perehdytty saumaukseen ja erilaisiin saumausmenetelmiin. Teoriaosuudessa on myös käsitelty barrier-ominaisuuksia ja kartongin päällystämiseen…
(more)
▼ Opinnäytetyön teoriaosuudessa on käsitelty kuppikartonkia, sen rakennetta ja vaatimuksia. Lisäksi osuudessa on perehdytty saumaukseen ja erilaisiin saumausmenetelmiin. Teoriaosuudessa on myös käsitelty barrier-ominaisuuksia ja kartongin päällystämiseen käytettäviä materiaaleja.
Kokeellisen osuuden saumaustestit toteutettiin muokkaamalla laboratoriokoneen eri saumausparametreja ja kustakin koepisteestä otettiin 15 rinnakkaisnäytettä. Saumojen lujuutta testattiin laboratoriossa repäisemällä saumatut kartongit irti toisistaan ja näytekappaleista mitattiin kuiturepeämän pituus. Pituuden mukaan saumalle annettiin arvosteluasteikon mukainen arvosana. Testejä tehtiin eri neliömassaisille ja erilaisilla päällystysmenetelmillä valmistetuille kartongeille. Saumaustesteissä käytetyt kartongit oli valmistettu kahdessa koeajossa, ensimmäisessä koeajossa käytettiin A toimittajan barrier-päällystettä ja toisessa B toimittajan barrieria.
Kokonaisuudessaan testejä voidaan pitää onnistuneina. Testien tuloksena parhaiten kuppikoneen tuloksia vastasi puhallusviiveen laskeminen laboratorion saumauslaitteella 0,7 sekuntiin vakioarvosta 1,24 sekuntia, tällöin korrelaatiokertoimeksi saatiin 0,98. Myös saumaaminen lämpötilalla 200 °C antoi hyvän korrelaatiokertoimen, 0,97. Lämpötilan ollessa 200 °C ongelmana oli kuitenkin rinnakkaisnäytteiden tulosten suuri hajonta. Tutkimusta aiotaan jatkaa muuttamalla useampaa parametria yhtä aikaa, jolloin voidaan saada aikaan vielä parempi korrelaatio. Myös puhallusviiveen testaaminen 0,5-0,9 sekunnin väliltä voisi parantaa hieman korrelaatiota.
The target of this thesis was to compare the sealing of the ISLA® barrier board in a laboratory hot air sealer and the customer's cup machine. The purpose of the comparison was to find parameters that correlated as closely as possible with the customer's sealing results.
The theory part of the thesis deals with the structure and requirements of the board used in the cups. In addition, the section focuses on sealing and various sealing methods. The theory section also deals with the barrier properties, board coating materials and coating methods.
In the experimental section, sealing tests were performed by modifying the various sealing parameters of the laboratory machine and 15 replicates were taken from each test point. The strength of the seams was tested in the laboratory by tearing off the seamed cartons, and the length of the fiber rupture was measured from the each sample. Depending on the length, the seam was given a grade on the rating scale. Tests were performed for cartons of different basis weights and different coating methods. The cartons used in the sealing tests were made in two test runs, the first running includes supplier A barrier coating and the second supplier B barrier coating.
The tests show that, he best result was obtained by decreasing the blast delay to 0,7 seconds from 1,24 seconds on the laboratory machine. When the blast delay was decreased the correlation coefficient was 0,98. Also the sealing at 200 °C gave a…
Subjects/Keywords: barrier; kartonkikuppi; kuppikone; kuumailmasaumaus
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APA (6th Edition):
Seppälä, J. (2019). Kuumailmasaumaus laboratoriossa ja tuotannossa. (Thesis). Theseus. Retrieved from http://www.theseus.fi/handle/10024/263922
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Seppälä, Juuso. “Kuumailmasaumaus laboratoriossa ja tuotannossa.” 2019. Thesis, Theseus. Accessed April 18, 2021.
http://www.theseus.fi/handle/10024/263922.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Seppälä, Juuso. “Kuumailmasaumaus laboratoriossa ja tuotannossa.” 2019. Web. 18 Apr 2021.
Vancouver:
Seppälä J. Kuumailmasaumaus laboratoriossa ja tuotannossa. [Internet] [Thesis]. Theseus; 2019. [cited 2021 Apr 18].
Available from: http://www.theseus.fi/handle/10024/263922.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Seppälä J. Kuumailmasaumaus laboratoriossa ja tuotannossa. [Thesis]. Theseus; 2019. Available from: http://www.theseus.fi/handle/10024/263922
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
26.
Taipale, Jukka.
Kuva-analyysin hyödyntäminen mikroreikien testauksessa.
Degree: 2019, Theseus
URL: http://www.theseus.fi/handle/10024/178601
► Opinnäytetyössä tutkittiin kuva-analyysin hyödyntämistä mikroreikien eli pinholen tutkimisessa. Mikroreiät ovat ei-toivottu ilmiö paperin päällystyksessä, jossa päällyste ei levity tasaisesti ja muodostaa barrier-ominaisuuksia haittaavia, mikroskooppisen pieniä…
(more)
▼ Opinnäytetyössä tutkittiin kuva-analyysin hyödyntämistä mikroreikien eli pinholen tutkimisessa. Mikroreiät ovat ei-toivottu ilmiö paperin päällystyksessä, jossa päällyste ei levity tasaisesti ja muodostaa barrier-ominaisuuksia haittaavia, mikroskooppisen pieniä reikiä. Pienen kokonsa vuoksi mikroreiät ovat toisinaan lähes mahdoton havaita paljaalla silmällä ja niiden olemassaolo monesti huomataan vasta silloin, kun päällystekerros altistuu esimerkiksi nesteelle. Mikroreikien vaikutuksesta päällyste ei pidä ja päästää nesteen kontaktiin pohjamateriaalin kanssa, huonontaen sen ominaisuuksia merkittävästi. Esimerkiksi elintarviketeollisuudessa tämä voi aiheuttaa pakkauksessa olevan tuotteen kontaminaation tai painotuoteteollisuudessa painovärin leviämisen niin, että visuaalinen lopputulos kärsii.
Työssä tutkittiin mikroreikien esiintymistä eri pohjamateriaali- ja päällystetyypillä sekä pyrittiin kehittämään menetelmä, jolla mikroreiät voitiin paikantaa mahdollisimman tehokkaasti kuva-analyysin avulla. Mikroreikien havaitsemiseksi käytettiin COBB-menetelmää, jossa näyte altistettiin värjätylle nesteelle määritetyksi ajaksi. Tämän jälkeen märitettiin käytettyjen nesteiden ominaisuudet kullakin pohjamateriaalilla kontaktikulmamittauksen avulla. Lopuksi näkyviin saatujen mikroreikien lukumäärää ja kokoa arvioitiin siihen tarkoitetulla tietokoneohjelmalla ja pyyhkäisyelektronimikroskoopin avulla.
Kuva-analyysissä käytetty COBB-testi osoittautui tiettyjen värjäysnesteiden ja altistusaikojen kanssa luotettavaksi ja edulliseksi menetelmäksi. Jokaisesta näytteestä, jossa tiedettiin olevan mikroreikiä, pystyttiin analyysin kautta selvästi havaitsemaan mikroreikien koko ja lukumäärä. Menetelmän yksinkertaisuuden vuoksi se sopisi hyvin käytettäväksi teollisuudessa, jossa mikroreikien määritys on yleinen ongelma ja haittaa tuotannon kulkua.
The objective of this thesis was to develop image analysis methods for pinhole identification. Pinholes are unwanted phenomenon in paper coating process where incomplete connection between substrate and adhesive will cause microscopic punctures. This will reduce the barrier properties of the coating by making possible for external substances, such as water, to make direct contact with the substrate. Due to its microscopic size, pinholes are practically invisible to human eye, thus its existence is usually noticed when the coating is already exposed. For example, in food industry pinholes in packages can cause a contamination of the product inside the package and in printing industry pinholes can make the paint spread between the interface so that the visual outcome will suffer.
This work consisted of studying the incidence of pinholes in different coating and substrates and finding a solution to identify them efficiently by using image analysis. For visual identification the COBB-method was used where the sample was exposed to a dyed liquid for specific period of time. Then the properties of these dyed liquids where examined with contact angle measurements with each substrate and…
Subjects/Keywords: mikroreiät; pinhole; barrier-ominaisuudet
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APA ·
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MLA ·
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CSE |
Export
to Zotero / EndNote / Reference
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APA (6th Edition):
Taipale, J. (2019). Kuva-analyysin hyödyntäminen mikroreikien testauksessa. (Thesis). Theseus. Retrieved from http://www.theseus.fi/handle/10024/178601
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Taipale, Jukka. “Kuva-analyysin hyödyntäminen mikroreikien testauksessa.” 2019. Thesis, Theseus. Accessed April 18, 2021.
http://www.theseus.fi/handle/10024/178601.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Taipale, Jukka. “Kuva-analyysin hyödyntäminen mikroreikien testauksessa.” 2019. Web. 18 Apr 2021.
Vancouver:
Taipale J. Kuva-analyysin hyödyntäminen mikroreikien testauksessa. [Internet] [Thesis]. Theseus; 2019. [cited 2021 Apr 18].
Available from: http://www.theseus.fi/handle/10024/178601.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Taipale J. Kuva-analyysin hyödyntäminen mikroreikien testauksessa. [Thesis]. Theseus; 2019. Available from: http://www.theseus.fi/handle/10024/178601
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of North Texas
27.
Sharma, Bed P.
Nano-crystallization Inhibition in 5 Nm Ru Film Diffusion Barriers for Advanced Cu-interconnect.
Degree: 2013, University of North Texas
URL: https://digital.library.unt.edu/ark:/67531/metadc407743/
► As the semiconductor industries are moving beyond 22 nm node technology, the currently used stacked Ta/TaN diffusion barrier including a copper seed will be unable…
(more)
▼ As the semiconductor industries are moving beyond 22 nm node technology, the currently used stacked Ta/TaN diffusion
barrier including a copper seed will be unable to fulfill the requirements for the future technologies. Due to its low resistivity and ability to perform galvanic copper fill without a seed layer, ruthenium (Ru) has emerged as a potential copper diffusion
barrier. However, its crystallization and columnar nanostructure have been the main cause of
barrier failures even at low processing temperatures (300 °C -350 °C). In this study, we have proposed and evaluated three different strategies to improve the performance of the ultrathin Ru film as a diffusion
barrier for copper. The first study focused on shallow surface plasma irradiation/amorphization and nitridation of 5 nm Ru films. Systematic studies of amorphization and nitrogen incorporation versus sample bias were performed. XPS, XRD and RBS were used to determine the physico-chemical, crystallization and
barrier efficiency of the plasma modified Ru
barrier. The nitrogen plasma surface irradiation of Ru films at substrate bias voltage of -350 V showed an improved
barrier performance up to 400 °C annealing temperatures. The
barrier barely started failing at 450 °C due mainly to nitrogen instability. The second study involved only amorphization of the Ru thin film without any nitrogen incorporation. A low energy ion beam irradiation/amorphization on Ru thin film was carried out by using 60 KeV carbon ions with different irradiation doses. The irradiation energy was chosen high enough so that the irradiation ions pass through the whole Ru thin film and stop in the SiO2/Si support substrate. The C-ion fluence of 5×1016 atoms/cm2 at 60 KeV made the Ru film near amorphous without changing its composition. XRD and RBS were used to determine the relationship between crystallization and
barrier efficiency of the carbon irradiated Ru
barrier. The amorphized Ru film showed an improved
barrier performance up to 400 °C annealing temperatures similar to the plasma nitrided Ru films. The
barrier barely began to fail at 450 °C due mainly to crystallization. The third study focused on a study of Al doping of nitrided Ru thin films and their crystallinity with the aim of obtaining a completely amorphous Ru based
barrier and stable nitridation. The addition of 4% Al and 14% of nitrogen in Ru produced a near amorphous film. Nitrogen in the film remained stable until the annealing temperature of 450 °C for 10 min in N2 atmosphere. Crystallization growth of the film was inhibited until 450 °C. At 500 °C, the crystallization of the Ru films barely started, but the degree of its crystallization is minimal. The Ru-Al-N film was demonstrated to be an effective diffusion
barrier for copper until the annealing temperature of 450 °C and began to fail at 500 °C. The Al doping was shown to stabilize the nitrogen in the Ru thin film
barrier inhibiting its crystallization and leading to improved diffusion
barrier performance and a gain in processing temperatures of 150 °C -200 °C…
Advisors/Committee Members: Bouanani, Mohamed El, Reidy, Richard F., Du, Jincheng, Aouadi, Samir, Rout, Bibhudutta.
Subjects/Keywords: Ruthenium; diffusion barrier; irradiation
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University of Georgia
28.
Smith, Erin Susan.
Assessment of archaeological deposits and depositional history of sediment stratigraphic units using grain size analyses, GPR, XRD, and absolute dating.
Degree: 2014, University of Georgia
URL: http://hdl.handle.net/10724/28909
► Skidaway Island is a Pleistocene-aged barrier island located along the northern coast of Georgia upon which more recent sediments have been deposited throughout the Holocene.…
(more)
▼ Skidaway Island is a Pleistocene-aged barrier island located along the northern coast of Georgia upon which more recent sediments have been deposited throughout the Holocene. Although past studies have analyzed various aspects of Skidaway
Island, the study presented here represents the first direct comparison of soils, sediments, geomorphology and archaeological resources from the northern part of the island. Ground penetrating radar and analyses of grain size, mineralogy, and age are
performed on sediments collected using a Giddings hydraulic corer. The first chronometric ages for sediments from the northern portion of Skidaway Island are reported and discussed. Using these dates in concert with other analyses reported herein, this
thesis provides a geological context for the origin and subsequent development of the island along with a discussion of archaeological resources encountered at the study locations.
Subjects/Keywords: Geoarchaeology; Skidaway Island; Barrier Island
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APA (6th Edition):
Smith, E. S. (2014). Assessment of archaeological deposits and depositional history of sediment stratigraphic units using grain size analyses, GPR, XRD, and absolute dating. (Thesis). University of Georgia. Retrieved from http://hdl.handle.net/10724/28909
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Chicago Manual of Style (16th Edition):
Smith, Erin Susan. “Assessment of archaeological deposits and depositional history of sediment stratigraphic units using grain size analyses, GPR, XRD, and absolute dating.” 2014. Thesis, University of Georgia. Accessed April 18, 2021.
http://hdl.handle.net/10724/28909.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
MLA Handbook (7th Edition):
Smith, Erin Susan. “Assessment of archaeological deposits and depositional history of sediment stratigraphic units using grain size analyses, GPR, XRD, and absolute dating.” 2014. Web. 18 Apr 2021.
Vancouver:
Smith ES. Assessment of archaeological deposits and depositional history of sediment stratigraphic units using grain size analyses, GPR, XRD, and absolute dating. [Internet] [Thesis]. University of Georgia; 2014. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/10724/28909.
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
Council of Science Editors:
Smith ES. Assessment of archaeological deposits and depositional history of sediment stratigraphic units using grain size analyses, GPR, XRD, and absolute dating. [Thesis]. University of Georgia; 2014. Available from: http://hdl.handle.net/10724/28909
Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation
University of Manchester
29.
Chen, Ying.
Study of Bond Coats for Thermal Barrier Coating
Applications.
Degree: 2015, University of Manchester
URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:279423
► Bond coats used in thermal barrier coatings (TBCs) for gas-turbine engine applications are studied in this thesis, with a focus on oxidation behaviour, surface rumpling…
(more)
▼ Bond coats used in thermal
barrier coatings (TBCs)
for gas-turbine engine applications are studied in this thesis,
with a focus on oxidation behaviour, surface rumpling and stress
evolution. Bond coats made of γ/γ’ Ni-Al-Pt alloys have been widely
used in TBCs and it has been found that addition of platinum
greatly improves the oxidation resistance of the coatings. The
mechanisms behind this benefit, however, are not well understood.
For this reason, the oxidation behaviour of four γ/γ’ Ni-20Al-xPt
(x= 0, 5, 10 and 15 at. %) alloys at 1150 °C is studied and
compared in terms of oxide spallation, oxide microstructure and
growth, residual stress in the oxide scale and oxide/alloy
interface morphology. The progressive increase of platinum addition
into the alloys results in (1) greater resistance to oxide
spallation, (2) reduction in oxidation of nickel, (3) lower
stresses in the α-Al2O3 scale and (4) more planar oxide/alloy
interfaces. It is found that the selective oxidation of aluminium
promoted by platinum plays a central role in the evolution of the
oxidation behaviour of the alloys.Surface rumpling of a NiCoCrAlY
bond coat deposited on a Ni-base superalloy during cyclic oxidation
at 1150 °C is studied. The extent of rumpling is found to depend on
thermal history, coating thickness and exposure atmosphere. While
the coating surface progressively roughens with cyclic oxidation,
bulk NiCoCrAlY alloys with the same nominal composition show a much
less tendency to rumple under the same thermal cycling condition.
The coatings, especially the thin ones, experience substantial
degradation (e.g. β to γ phase transformation and exhaustion of
yttrium) induced by oxidation and coating/substrate interdiffusion
during thermal exposure. The observations together suggest that
rumpling is driven by the lateral growth of the thermally grown
oxide (TGO) and the coating deforms in compliance with the TGO.
While the dependence of rumpling development on experimental
conditions is generally in agreement with the prediction of the
existing model, it is suggested that the degradation of the
NiCoCrAlY coating and its dependence on coating thickness need to
be taken into consideration when predicting the rumpling
development of NiCoCrAlY coatings.The residual stresses in a
NiCoCrAlY bond coat deposited on a Ni-base superalloy are studied
by X-ray diffraction using the sin2Ψ technique. The stresses at
room temperature are found to be tensile; they first increase and
then decrease with oxidation time. The stress develops and builds
up upon cooling, predominantly within the temperature range from
1150 °C to 600 °C. Due to the limited penetration depth into the
bond coat, the X-ray only probes the stress in a thin surface layer
consisting of a single γ-phase formed through aluminium depletion
during oxidation. Above 600 °C, the volume fraction of the β-phase
in the bond coat increases with decreasing temperature. The
mechanisms of stress generation in the coating are examined and
discussed based on experiments designed to isolate the…
Advisors/Committee Members: MUMMERY, PAUL PM, Xiao, Ping, Mummery, Paul.
Subjects/Keywords: Bond Coat; Thermal Barrier Coating
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APA ·
Chicago ·
MLA ·
Vancouver ·
CSE |
Export
to Zotero / EndNote / Reference
Manager
APA (6th Edition):
Chen, Y. (2015). Study of Bond Coats for Thermal Barrier Coating
Applications. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:279423
Chicago Manual of Style (16th Edition):
Chen, Ying. “Study of Bond Coats for Thermal Barrier Coating
Applications.” 2015. Doctoral Dissertation, University of Manchester. Accessed April 18, 2021.
http://www.manchester.ac.uk/escholar/uk-ac-man-scw:279423.
MLA Handbook (7th Edition):
Chen, Ying. “Study of Bond Coats for Thermal Barrier Coating
Applications.” 2015. Web. 18 Apr 2021.
Vancouver:
Chen Y. Study of Bond Coats for Thermal Barrier Coating
Applications. [Internet] [Doctoral dissertation]. University of Manchester; 2015. [cited 2021 Apr 18].
Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:279423.
Council of Science Editors:
Chen Y. Study of Bond Coats for Thermal Barrier Coating
Applications. [Doctoral Dissertation]. University of Manchester; 2015. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:279423
University of British Columbia
30.
Ngan, Caroline Lai Yung.
Experimental investigations of anchorage capacity of precast concrete bridge barrier for Performance Level 2.
Degree: Master of Applied Science - MASc, Civil Engineering, 2008, University of British Columbia
URL: http://hdl.handle.net/2429/1518
► In the last twenty years, the design requirements of bridge barriers have changed with the aim of improving the safety of commuters on the bridge.…
(more)
▼ In the last twenty years, the design requirements of bridge barriers have changed with the aim of improving the safety of commuters on the bridge. A majority of precast concrete bridge barriers (PCBB) on highway bridges in British Columbia were designed and installed in accordance with the 1988 Canadian Highway Bridge Design Code (CHBDC). To ensure that these barriers comply with the current code requirements, research and testing were deemed obligatory. In particular, the anchorage capacity of the parapet under the CHBDC design load warrants verification. A finite element model of the barrier was developed in ANSYS to study its structural response. Static testing of a set of barriers was carried out at the University of British Columbia to better understand the behaviour of the barrier. The experimental results were used to calibrate and verify the finite element model. Through the finite element model and experimental results, a simpler model has been developed in a formatted spreadsheet environment to allow better estimates of the anchorage capacity of different barrier designs. The model was scaled to a wider use for practicing engineers so to ease and improve the design of anchorages of precast concrete bridge barrier under Performance Level 2 loading in accordance with the Canadian Highway Bridge Design Code.
Subjects/Keywords: Barrier; Anchorage
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APA (6th Edition):
Ngan, C. L. Y. (2008). Experimental investigations of anchorage capacity of precast concrete bridge barrier for Performance Level 2. (Masters Thesis). University of British Columbia. Retrieved from http://hdl.handle.net/2429/1518
Chicago Manual of Style (16th Edition):
Ngan, Caroline Lai Yung. “Experimental investigations of anchorage capacity of precast concrete bridge barrier for Performance Level 2.” 2008. Masters Thesis, University of British Columbia. Accessed April 18, 2021.
http://hdl.handle.net/2429/1518.
MLA Handbook (7th Edition):
Ngan, Caroline Lai Yung. “Experimental investigations of anchorage capacity of precast concrete bridge barrier for Performance Level 2.” 2008. Web. 18 Apr 2021.
Vancouver:
Ngan CLY. Experimental investigations of anchorage capacity of precast concrete bridge barrier for Performance Level 2. [Internet] [Masters thesis]. University of British Columbia; 2008. [cited 2021 Apr 18].
Available from: http://hdl.handle.net/2429/1518.
Council of Science Editors:
Ngan CLY. Experimental investigations of anchorage capacity of precast concrete bridge barrier for Performance Level 2. [Masters Thesis]. University of British Columbia; 2008. Available from: http://hdl.handle.net/2429/1518
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Open Access Theses and Dissertations