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 23 for “"Colour changes"”.
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Colour changes in nano-filled and micro-hybrid composite resins on exposure to spices.
Colour changes in composite resins after immersion in beverages such as coffee, tea, alcohol beverage and carbonated drinks have been reported. Although much work has been done to determine the staining susceptibility of composite resins to various liquid beverages, effects of spices on colour …
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Influence of a bleaching agent on stained direct composite resins
… their physical and mechanical properties, discolouration, either intrinsic or extrinsic still remains a major drawback and is one of the main reasons for the replacement of these restorations. Toothbrushing and polishing procedures have been attempted to eliminate extrinsic staining without …
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Isoniazid and acetylisoniazid urine concentrations as a maker of adherence to isoniazid preventative therapy in children
… test can be affected by observer variation in colour changes, concomitant medications, urinary dilution, and presence of other substances in urine. Moreover, the Arkansas test results have not been evaluated against objective measurement of isoniazid and acetylisoniazid urine concentrations. …
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Enhanced colour encoding of materials discrimination information for multiple view dual-energy x-ray imaging
… These techniques are designed to provide colour-coded materials discrimination information in a sequence of perspective images exhibiting sequential parallax. The methods developed are combined with a novel 3D imaging technique employing depth from motion or kinetic depth effect (KDE). …
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Factors influencing salt-induced weathering of building sandstone.
… sandstone was investigated by looking at the changes in a series of weathering indicators selected. These were mainly, porosity and pore size distribution changes, chemical composition and colour changes. Laboratory studies involved the use of artificial weathering studies. Samples of …
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Early detection of oesophageal cancer based on colour appearance and colour-based data augmentation
… here is that early stage of caner present subtle changes in comparison with normal skill tissue and can easily missed being diagnosed (1 in 4). This research investigates the contribution of colour attribute in diagnosis of OC. Two studies are conducted. One is to distinguish colour differences …
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Flow-injection analysis of the platinum-group metals
… with the PGMs to yield a series of intensely coloured complexes in acidic solutions forms the basis of these methods. The reaction is subject to relatively few interferences from other transition metals. A high speed scanning spectrophotometer is employed to obtain second order data. The …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… performance. Visual inspection based on the colour changes of the thin films showed quinone (yellow) formation of the irradiated films of BP and BPC of VOP and WOP. As a conclusion, the effect of prolonged exposure to UV light, in general promotes photo degradation for BP but BPC gives slower …
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Photodegradation of biopolymer doped with titanium dioxide (TiO2) as ultraviolet (UV) stabilizer
… performance. Visual inspection based on the colour changes of the thin films showed quinone (yellow) formation of the irradiated films of BP and BPC of VOP and WOP. As a conclusion, the effect of prolonged exposure to UV light, in general promotes photo degradation for BP but BPC gives slower …
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Multiwavelength behaviour of Cygnus X-3 and related objects
… light on the source, including possible orbital colour changes and a longterm correlation between radio and infrared flux levels. Deep imaging of the field reveals many previously undiscovered infrared sources within a few arcsec of Cyg X-3. Simultaneous millimetre and radio observations of Cyg …
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Nanoparticle sensors for the detection of DNA related to disease
… colorimetrically, due to the characteristic colour changes associated with aggregation of gold and silver nanoparticles, and by monitoring the hybridisation-induced red-shift of the surface plasmon band by UV-Vis spectroscopy. The hybridisation-induced aggregation methodology was also …
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Of Pigments and Paint : quantifying ochre and rock art in the Cederberg (Western Cape, South Africa
… of rock paintings from the same sites based on colour classification from the Later Stone Age assemblages of three rock shelters, De Hangen, Andriesgrond and Diepkloof in the Western Cape, South Africa. This work begins to bridge the gap that exists between the excavated archaeology and the …
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The synthesis and investigation of alizan-based functional chromogenic probes for heavy mental sensing in aqueous medium
… (1:9) and ethanol solvent systems. Whereas vivid colour changes were observed when dithizone complexed with ions. Subsequently, in addition to sensing of cations and anions, all chromogenic probes were employed for signaling of commercial water and borehole water in different solvent systems. …
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Thiel Plastination: Improving the Aesthetics and Flexibility of Traditional Plastinated Specimens
… using alternative materials as well as colour changes observed throughout the plastination process. Ultimately this project provides recommendations on the optimum way to plastinate Thiel embalmed specimens with the aim of retaining flexibility and life-like colour. <br/><br/>This …
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Studies on photochromic and potentially mesogenic mercury(II) dithizonates
… in organic solvents, displaying reversible colour changes from yellow to blue on irradiation with visible light. The visible absorption spectra of these solutions were recorded and appeared to be independent of the nature of the long-chain organic ligand. This photochromism was not observed …
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Development of new adaptive materials based on spiropyran molecular photoswitches
… can be reversibly switched between two states: a colourless, non-polar, uncharged spiro form (SP) and a highly coloured, polar, conjugated, zwitterionic merocyanine form (MC), i.e. SP → MC (UV light), MC → SP (green, white light). Furthermore, the MC form possesses a phenolate group that can …
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Remote sensing of penguin populations: Development and application of a satellite-based method
… satellite images includes examination of guano colour for different species and comparison of methods of guano detection, aiming to enhance species detection from satellite imagery. In addition, Landsat 8 imagery from further locations is used to produce time series of this index for colonies, …
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Adobe Conservation: Evaluation of Silicone and Acrylic Consolidants
… compressive strength, bending strength and colour changes. Chemical analysis (X-ray diffraction) was used to study the chemical components of the soil and scanning electron microscopy showed changes to the treated surfaces after application of the chemicals. This research can be used as a …
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DEVELOPMENT OF A MULTIFUNCTIONAL COOKING APPLIANCE: EVALUATION OF FOOD QUALITY INDEXES AND COOKING FUNCTIONS.
… method was developed to objectively measure colour changes, enabling precise monitoring of pizza quality during baking. Results showed that high-temperature cooking (450°C) achieved pizzeria-style quality with optimal moisture retention and crust browning. Medium-temperature cooking (310°C), …
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The non-invasive quantification of cutaneous haemoglobin and its oxygenation by reflectance spectrophotometry
… and their usefulness in quantifying "skin colour" changes. To find the correlation between in-vivo haemoglobin index and the true amount of haemoglobin in blood in g/dl, skin reflectance measurements and blood samples were taken from patients who attended a blood clinic. The correlation …
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