Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Barrier effect"”.
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Coupled Air-Sea-Land Interactions: Understanding the MJO Eastward Propagation and Maritime Continent Barrier Effect
… experiments to better understand the MC barrier effects on the MJO (Chapter 4). Finally, we use 20 years of satellite-derived precipitation observations to investigate the seasonal and interannual variability of the MJO eastward propagation and its zonal and meridional variability …
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Fundamental investigations on the barrier effect of polyester micro fiber fabrics towards particle-loaded liquids induced by surface hydrophobization
… of the present work is the improvement of the barrier effects of textile fabrics in the medical sector, in particular, in the operating room, which would be an effective safeguard against the causative pathogens allowing the health workers to work in and around hostile atmospheres and to …
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Surface heat fluxes and MJO propagation through the Maritime Continent
The 'barrier effect' of the Maritime Continent (MC) is a known hurdle in understanding the propagation of the Madden-Julian Oscillation (MJO). To understand the differing dynamics of MJO events that propagate versus stall over the MC, a new MJO tracking algorithm utilizing 30-96 day filtered NOAA …
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Cryogenic operation of silicon-germanium heterojunction bipolar transistors and its relation to scaling and optimization
… a novel negative differential resistance (NDR) effect and a collector current kink effect in first-generation SiGe HBTs at deep cryogenic temperatures. A theory of positive feedback due to the enhanced heterojunction barrier effect at deep cryogenic temperatures is proposed to explain such …
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Characterization and modeling of the barrier properties in nanostructured systems
… experienced a remarkable enhancement of the barrier properties, which was explained by the strong interconnection at the nano-scale between the organic moiety and silica domains. An analogous characterization was performed on microfibrillated cellulose films, which presented remarkable …
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Development of a Humidity-Resistant Coating to Impart High Oxygen Barrier Performance to Food Packaging Films
<p>Oxygen barrier coatings have the potential to greatly extend the lifetime of certain food products by incorporating them into existing food packaging. Present technologies face definite challenges of maintaining high performance, while attaining simple and inexpensive preparation methods. The …
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Spatial distribution of anuran assemblages from Caxiuanã, Brazil : testing the riverine barrier hypothesis and the influence of life-history traits
… the understanding of biodiversity and forming effective conservation plans. In the Amazon basin, the spatial structure of animal communities has often been explained by the riverine barrier hypothesis, which assumes that large rivers act as main ecological drivers of diversification. However, …
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Preliminary investigation of light scattering and visibility in two eastern national parks
… side of a park to the other possibly due to the "barrier" effect of mountain peaks which divide each park. Data also indicate the existence of a distinct upper aerosol boundary layer which correlates well with the observed haze layer. The presence and distribution of light scattering aerosols as …
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FIELD METHOD EFFICACY TO DETECT MEDIUM AND LARGE MAMMAL PRESENCE NEAR ROADWAYS AT VAIL PASS, COLORADO
… the southern Rockies. To alleviate its potential barrier effect, the Colorado Department of Transportation is proposing to build a wildlife bridge on I-70 just west of Vail Pass. This study is aimed at testing which field techniques are most effective at documenting species presence in order to …
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FIELD METHOD EFFICACY TO DETECT MEDIUM AND LARGE MAMMAL PRESENCE NEAR ROADWAYS AT VAIL PASS, COLORADO
… the southern Rockies. To alleviate its potential barrier effect, the Colorado Department of Transportation is proposing to build a wildlife bridge on I-70 just west of Vail Pass. This study is aimed at testing which field techniques are most effective at documenting species presence in order to …
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Development of Anti-corrosive Polyester Powder Coatings
… filler, namely zinc phosphate with passivation effect, zinc powder with sacrificial anode effect, and two nanoclays with barrier effect were incorporated into the coatings to enhance the anti-corrosive performance. The anti-corrosive properties were evaluated by electrochemical techniques and …
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Study of microstructure effect on the thermal properties of Yttria-stabilized-Zirconia thermal barrier coatings made by atmospheric plasma spray and pressing machine
Thermal barrier coatings (TBCs) are used in gas turbine engines to achieve a higher working temperature and thus lead to better efficiency. Yttria-Stabilized-Zirconia (YSZ), a material with low thermal conductivity, is commonly used as the top coat layer to provide the thermal barrier effect. In …
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Are Highways Stressful for Pikas?: Analysis of Stress Hormones of the American Pika (<i>Ochotona princeps</i>) Living Adjacent to Interstate 90 in the Cascade Range of Washington State
… Wildlife crossing structures perforate the barrier-effect of roads, providing safe passage for species dispersing across roads, thereby reconnecting ecosystems. Some wildlife species live in modified habitats along roads and in habitat features within wildlife crossing structures, but their …
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Diversification of Antbirds Associated with Amazonian Flooded Forest Habitats
Rivers represent one of the few geographic barriers that bisect, and promote allopatric speciation, in an otherwise continuous landscape of the Amazon basin. In contrast to Amazonian understory forests birds, which replace each other across river barriers, a strong barrier effect has not been …
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Charakterisierung, Modellierung und Optimierung der Barriereeigenschaften von OP-Textilien
… auf die Porenstruktur und die davon abhängige Barrierewirkung von marktrelevanten OP-Geweben grundlegend analysiert. Daraus resultiert der Schwerpunkt der Arbeit – die Erarbeitung von Modellen – mit denen die Zusammenhänge zwischen strukturbedingten Einflussgrößen von Geweben und deren …
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Étude des recouvrements avec effet de barrière capillaire pour minimiser les infiltrations d'eau dans les sites d'enfouissement de matières résiduelles
… cover for landfills, i.e. covers with capillary barrier effect (CCBE). The use of recycled materials, such as DBP, as parts of such covers has the advantage of reducing the quantity of waste to be disposed of (DBP used to be landfilled as waste), while offering an efficient control to the …
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Barrier Effects Of Roads And Traffic On Animal Occurrence, Space Use, And Movements
… biodiversity around the world. Roads can act as barriers by impeding animal movement and restricting animal space use. An understanding of factors that influence barrier effects is important to discern the impacts of habitat fragmentation and to develop appropriate mitigation. The barrier effects …
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Effect of Mesoporous Silica-Loaded Anticancer Drugs on 3D vs 2D Models of Colon Cancer Cells
… in both 2D and 3D cellular models. Cytotoxic effects of encapsulated anticancer drug formulations were assessed using MTT assay on 2D monolayer cells and 3D spheroids. DMU121MSN and OXAMSN exhibited greater concentration- and time-dependent cytotoxicity (p <0.01) in 2D monolayer cells than in …
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Investigating the Hydration and Disintegration Mechanisms of Film-Coated Pharmaceutical Tablets
… was found to act as a temporary mass transport barrier that prevented capillary water transport before the barrier becomes more water-permeable due to coating polymer solubilisation. A three-parameter correlation between the film coating dissolution time, coating thickness and coating density …
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Implications of small-scale run-of-river hydropower schemes on fish populations in Scottish streams
… impacts can be observed upstream of an intake (barrier effect), upstream and downstream of an intake (barrier and abstraction effect) and downstream of an intake (abstraction effect). In total, ten schemes were included within this study; five with extensive pre-and post-monitoring and a further …
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