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 77 for “"Color change"”.
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The role of alpha-melanocyte stimulating hormone in environmentally induced color change.
… that the endocrine basis of integumental color change in vertebrates is due to pituitary secretion of alpha-melanocyte stimulating hormone (α-MSH). However, physiological levels of α-MSH has not been reported for several species that have historically been the models of choice for …
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In vitro Staining of Denture Liners and Potential for Color Correction Using Commonly Available Denture Cleansers
… of common denture liners to agent-induced color change which, in turn, adversely impacts the esthetic appeal of the associated removable prosthesis.</p> <p>Objective: The purpose of the study was to evaluate the color stability of denture liners exposed to commonly encountered food stains …
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The effects of common household cleaning agents and aging on the removal of quantitatively applied food stains from rayon, nylon, and olefin pile upholstery fabrics
… objective was to correlate the instrumental color change measurements with ratings obtained from a consumer panel. The specimens were soiled with mustard, vegetable oil, milk, and syrup. After aging for one day or two weeks, the specimens were treated for stain removal with a …
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The in vitro effect of a tooth bleaching agent on coffee and wine stained teeth
… bleaching agent by evaluating the degree of color change with the use of a spectrophotometer and not by the usual subjective, visual methods. Methodology: Twenty specimens of human teeth will be collected, polished and divided into two groups. A baseline color measurement by the CIE L* a* b* …
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Electrospinning applications in mechanochemistry and multi-functional hydrogel materials
… is spiropyran, a molecule that exhibits a color change when activated, although large strains are required to achieve this activation in elastomeric materials. In addition to color change, the activation of nonpolar spiropyran also results in the formation of a polar species. …
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Irradiação da luz violeta associada ao peróxido de carbamida para clareamento dentário em consultório: uma revisão sistemática e meta-análise
… using RevMan 5.4 software to evaluate tooth color change and tooth sensitivity to bleaching. The former was assessed by mean difference and the latter by risk difference. Results: Three randomized clinical trials were included. A statistically significant difference was found for color change …
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Investigations of Ethylene and Ethylene Inhibition, Ball Lie, and Synthetic Turf Color
… that synthetic turf could experience fading of colors through exposure to daily sunlight by assessing the color retention qualities of synthetic turf by digital image analysis. While color change was noticed, quantification of color change was not consistently measured.</p>
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Increased Utility of pH Sensitive Indicators as High Concentration CO2 Detectors Through the Use of Polyelectrolyte Complexes as Stabilizing Media
… of plastic materials which produce visible color change when exposed to different environments has recently attracted attention for many biomedical applications.<sup>1,2</sup>Many biomedical devices are packaged under high concentrations of carbon dioxide (CO<sub>2</sub>) which can lower the …
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Inkjet printing polymerized pcda as a means of serialization
… known as pentacosadiynoic acid, due to its color changing response to high temperatures, has been used as a means of indicating whether the material has been exposed to high temperatures. Quick-Response codes or Q-R codes have been used as means of serialization due to their two-dimensional …
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Cation effects on the purple membrane of Halobacterium halobium
… surface do not directly affect the color change. The intrinsic pK$\sb{\rm a}$ of the binding of the special divalent cation and of the color transition is at about pH 2. The events involve the exchange of one divalent cation for two protons; I suggest that the two groups which …
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The Effects of Perspiration Application, Weathering Exposures, Washing Action of Automatic Home Clothes Washers, and Repeated Laundering on the Ultraviolet Protection of a Naturally Colored Lightweight Cotton Fabric
… and environmental issues, naturally colored cotton was recommended as it provides better ultraviolet protection than regular cotton. In addition, the production of naturally colored cotton is more environmentally friendly than regular cotton. Although several studies have been …
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Development of a Chlorine Dioxide Gas Concentration Monitoring Unit and Kinetic Analysis of the Effect of Chlorine Dioxide Treatment on Color and Microbial Content Change of Spinach
… medium, the molecular absorption cross section changes. The purpose of this study was to develop an inexpensive and robust measurement device that would accurately measure ClO2 in real time. Without the ability to obtain highly specified light output and detection devices, extensive calibration …
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Effect of low concentrations of antibiotic intracanal medicaments on crown discoloration and push-out bond strength
… strength of root cements and lead to tooth discoloration. Objectives: To evaluate the effects of 1) low concentrations of TAP and DAP (1 mg/mL) on push-out bond strength of various root cements, and 2) low concentrations of TAP and DAP (1 mg/mL and 10 mg/mL) on crown discoloration. Materials …
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Digital textile printing: colorfastness of reactive inks versus pigment inks
… there is a constant need to reproduce consistent colors throughout different print runs and crucial for these colors to perform well and up hold under certain conditions. The purpose of this study was to research the colorfastness digitally printed reactive and pigment inks printed on cotton …
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Black and White: Structural and Functional Aspects of Dermal Chromatophores of the Marbled Whiptail Lizard (Cnemidophorus Marmoratus)
… important for these diurnal animals. Albedo, coloration, pattern, and in some circumstances color change, may be determined by placement and orientation of three distinct types of dermal chromatophores (xanthophores, iridophores, and melanophores). Here electron microscopy, brightfield …
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Effects of Moisture on Combustion of Live Wildland Forest Fuels
… results showed various phenomena such as color change, bubbling, bursting, brand formation, and bending; these phenomena were species-dependent. Quantitative results showed differences in the ignition values (time, temperature, and mass) among species. It was observed that all moisture did …
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The Efficacy of a Borate and Penetrating Oil Preservative Combination for the Conservation of Exterior Wood
… modes of failure via substrate morphology change (SEM), pigment loss and color change (spectrophotometer); 4) To apply this data to help formulate a practical preservative system for the conservation of exterior wooden cultural heritage. The results of the accelerated weathering program …
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A Colorimetric Sensor Array for Aqueous Analyses
… of water. This thesis describes a simple colorimetric sensor array that probes a wide range of chemical properties. By printing hydrophobic dyes on a hydrophobic membrane, sensor arrays are easily prepared with substantial chemical selectivity for the identification and quantification of …
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Optical detection of finger pressure through utilization of nailbed color changes
… by visually examining a user's fingernail coloration. Unlike other finger-based controllers that primarily depend on covering the finger pad, this method of sensing allows for accurate measurements without impairing a user's tactile sense. First the color change of a fingernail is examined …
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