COLORIMETRY

Author: DÍAZ GONZÁLEZ M. FRANCISCA.
Year: 2003.
University: EXTREMADURA [More theses of this university] [www.unex.es].
Place of defense: FACULTAD DE CIENCIAS.
Place of preparation: FACULTAD DE CIENCIAS.

Summary: The objective of this trabjo is to study the influence of color blindness in tasks cotidianasdonde intervenes color, students who are studying Early Childhood Education. In this work we have selected a sample of 13 centers Education Child Extrémadura, with a total of 1039 subjects between 4 and 5 years (551 boys and 488 girls). Once evaluated through various tests pseudoisocromáticas (Ishihara test, test CVTME and a test of newly created specifically for students between 3 and 6 years, the test Orion) each of the children, the result of defective students on the vision of color is 2 girls and 37 boys. This figure represents a total of 6.89% of the male population and 0.41% of the female data were similar to those obtained with adult subjects. Subsequently were selected at random and an equal number of pairs among their classmates with a vision of non-defective colors, obteniéndose a second sample of 78 students, 4 girls and 74 boys. Both groups were tested based learning tasks in the area of Communication and Representation (drawn from various school supplies), in which, apart from learning content, was indirectly involved discrimination color. It proposed 8 different tasks that were presented again individually to each of the students for about 50 minoPrácticamente to 100% of the students with normal color vision were able to respond adequately to the requirements of the tasks, in the opinion of their teachers . By contrast, students expressed defectivos many errors of execution. It was subsequently performed a comparative analysis of the academic performance of these two groups of students if the proposed tasks were in black and white. The tests used are those that are commonly found in the departments of counseling and used by the teachers themselves. In this case, we noted that there was no significant difference between the results obtained by the group of subjects defective and the group of no-defectivos. Lastly have developed different materials on the subject of Color: A Teaching Unit on the Color Early Childhood Education One Macrosecuencia on Unit One Color Didactics on Color 2Â ° Baccalaureate that will be available to teachers. These materials appear activities teachinglearning for Early Childhood Education, Compulsory Secondary Education and Bachelor University.

Author: PARDO FERNÁNDEZ PEDRO JOSÉ.
Year: 2003.
University: EXTREMADURA [More theses of this university] [www.unex.es].
Place of defense: FACULTAD DE CIENCIAS.
Place of preparation: FACULTAD DE CIENCIAS.

Summary: This research work has been designed and built a new type of visual colorimeter with three color channels that provide incentives for high purity and high luminancia.Este device colorimetric pilot is fully automated both in the generation of color stimuli as in the characterization chromatic of them, using for this purpose a personal computer and communication through three serial ports RS-323.Así it has been used for the characterization chromatic of monocromadores a novel system based on neural networks type Back-propagation obtaining an error the adjustment of less than 1%. This new experimental device has been applied to the study of perception of color in humans and mathematical modeling using two tests mentally. The first ellaas permits variability between observers to conduct an equalization chromatic a stimulus spectral yellow by mixing a stimulus spectral red and estímulio espectra verde.Los results have shown the existence of significant differences in the rate of mixing red / green men and women employed by suggesting treatment separately. The second experience psychophysics deals determining the model of color vision underlying the experimental results obtained to draw the curve isoluminosidad several observadores.Este model of color vision has sidor obtained through an indirect form of statistical analysis that is not part of goal none of the assumptions that are usually taken in such investigaciones.El principal component analysis has revealed a common structure in all observers that conincide with the information channels are divided into those who usually models of color vision type neural .

Author: DÍAZ GONZÁLEZ MARÍA FRANCISCA.
Year: 2003.
University: EXTREMADURA [More theses of this university] [www.unex.es].
Place of defense: FACULTAD DE CIENCIAS.
Place of preparation: FACULTAD DE CIENCIAS.

Summary: The objective of this work is to study the influence of color blindness in carrying out daily tasks where the color, students who are studying Early Childhood Education. In this work we have selected a sample of 13 centers for Early Childhood Education in Extremadura, with a total of 1039 subjects between 4 and 5 years (551 boys and 488 girls). Once evaluated through various tests pseudoisocromáticas (Ishihara test, test CVTME and a test of newly created specifically for students between 3 and 6 years, the test Orion) each of the children, the result of defective students on the vision of color is 2 girls and 37 boys. This figure represents a total of 6.89% of the male population and 0.41% of the female data were similar to those obtained with adult subjects. Subsequently were selected at random and an equal number of pairs among their classmates with a vision of non-defective colors, obteniéndose a second sample of 78 students, 4 girls and 74 boys. Both groups were tested based learning tasks in the area of Communication and Representation (Extraídas several school materials), in which, apart from learning content, was indirectly involved discrimination color. It proposed 8 different tasks that were presented again individually to each of the students for about 50 minutes. Nearly 100% of students with normal color vision were able to respond adequately to the requirements of lasa tasks, in the opinion of their teachers. By contrast, students expressed defectivos many errors of execution. It was subsequently performed a comparative analysis of the academic performance of these two groups of students if the proposed tasks were in black and white. The tests used are those that are commonly found in the departments of counseling and used by the teachers themselves. In this case, we noted that there was no significant difference between the results obtained by the group of subjects defective and the group of no-defectivos. Lastly have developed different materials on the subject of Color: A Teaching Unit on the Color Early Childhood Education One Macrosecuencia on Unit One Color Didactics on Color 2Â fourth Baccalaureate that will be available to teachers. These materials appear teaching-learning activities for Early Childhood Education, Compulsory Secondary Education and Bachelor University.

Author: PARDO FERNÁNDEZ PEDRO JOSÉ.
Year: 2003.
University: EXTREMADURA [More theses of this university] [www.unex.es].
Place of defense: FACULTAD DE CIENCIAS.
Place of preparation: FACULTAD DE CIENCIAS.

Summary: This research work has been designed and built a new type of visual colorimeter with three color channels that provide incentives for high purity and high luminance color. This experimental device is fully automated both in the generation of color stimuli as in the characterization of the same color, using it to a personal computer and communications would be through three RS-232. It also was used for the characterization of monocromadores a chromatic novel system based on neural networks type Back-propagation obtaining an error in the setting of less than 1%. This new experimental device has been applied to the study of perception of color in humans and mathematical modeling using two tests mentally: The first of these permits, study the variability between observers to conduct an equalization chromatic a stimulus spectral yellow through a mixture of encouragement and a stimulus spectral red spectral green. The results have shown the existence of significant differences in the rate of mixing red / green men and women employed by suggesting treatment separately. The second experience psychophysics deals determining the model of color vision underlying the experimental results obtained to draw the curve isoluminosidad several observers. This model of color vision has been obtained indirectly through a statistical analysis objective not part of any of the assumptions that are usually taken in these types of investigations. The principal component analysis has revealed a common structure in all observers that coincides with the information channels are divided into those who usually models of color vision type neural.

Author: TORTAJADA MONTAÑANA IGNACIO.
Year: 2005.
University: POLITÉCNICA DE VALENCIA [More theses of this university] [www.upv.es].
Place of defense: Dep. Expresion Grafica en la Ingenieria.
Place of preparation: Universidad Politécnica de Valencia.

Summary: One of the classic problems of the colorimetry is to improve the correlation between the perceived color (visual system's response) and color measured (more or less complex calculation of the tristimulus values), and may have points close to the stimulus, not where there is variation in color and whether perceived color measured. These points are said to be within the threshold of that color stimulus. In this paper, are going to determine the threshold differential chromatic nine stimuli generated close to white cardboard and colored by merging time of the test. This has been designed and developed a device experimental sufficiently sensitive to both versatile and simple, which will guarantee the reproducibility of stimuli. We have used four observers, two men and two women aged between 18 and 20 years with normal levels of vision and a higher level of discrimination chromatic Farnsworth as the test of 100 tones. The variability of the results obtained in this work among observers is variability in levels very similar to those of other classical works. Analyzing the possible influence of the purity at the threshold of discrimination was noted that within the so-called white areas by Kelly, stimuli blue, red and green color differential increase their threshold as we approach Pattern C, the same stimuli if you are close to Pattern A, in the green and red in color differential diminishes your doorway with decreasing its purity, while the blue behavior very different. In addition, it was found that within the fotópico, virtually non-existent influence on the threshold luminance color differentials.

Author: EZQUERRO RODRÍGUEZ JOSE MIGUEL.
Year: 2005.
University: COMPLUTENSE DE MADRID [More theses of this university] [www.ucm.es].
Place of defense: FACULTAD DE CC. FÍSICAS.
Place of preparation: FACULTAD DE CIENCIAS FÍSICAS.

Summary: The purpose of the investigation that collects this report is to determine how theoretically affect the functions of color matching in the perception of absolute and relative incentives for a comprehensive set of real observers. It has developed a procedure for generating spectral distributions of radiant power are metaméricas respect to an observer that is used as a reference. The distributions generated by these tools allow locally assess variability intra-e inter-observadores in the perception of color stimuli as well as the perception of color differences. The variability obtained in the numerical assessment coincides with the referenced in the literature available and which has been obtained experimentally.

Author: PASAMONTSE FUNEZ ALBERTO.
Year: 2006.
University: ROVIRA I VIRGILI [More theses of this university] [www.urv.cat].
Place of defense: FACULTAT DE QUÍMICA.
Place of preparation: UNIVERSITAT ROVIRA I VIRGILI. FACULTAT DE QUÍMICA.

Summary: The aim of this thesis has been studying and developing analytical methodologies using a sequential injection system (EIS) with a spectrophotometer diode in a row to get data from the second order. To deal with these data, tools quimiométricas used were; multivariate curve resolution through alternating least squares (MCR-ALS) and other technologies related to it as the principal component analysis (PCA) and SIMPLISMA. This methodology was applied to the determination of amoxicillin and clavulanic acid in medicine. The analysis of drugs interest in controlling quality of the product itself, and if the method because it is relevant to point, connects to another area of greatest interest is the clinical analysis for the study of the effect and / or changing drugs the human body. Within this scope, analysis of antibiotics is important for the application of these great products. This is justified by the desire to have rapid and automated analytical methods because it is associated with a minimization of costs, reduced time for analysis and expenditures reagents, and safety when working with toxic substances. In general it can be concluded that the combination of a sequential injection system (EIS) and a tool quimiométrica as multivariate curve resolution through alternating least squares (MCR-ALS) can be used to perform a qualitative and quantitative analysis and it provides information on the profiles of concentration and spectral profiles of the various species to study.

Author: SALEH ARAFA.
Year: 2006.
University: GRANADA [More theses of this university] [www.ugr.es].
Place of defense: FACULTAD DE CIENCIAS.
Place of preparation: FACULTAD DE CIENCIAS.

Summary: Since the year 2000 have been introduced in the market for new systems composite restoration specifically designed to achieve mimic the optical properties of dental tissues, especially in terms of color and translucency. Given his recent appearance, are scarce and very recent work addressing the study of these properties in these new systems Restoration and the factors influencing them. Due to the above, the objectives of the study were as follows: 1-Evaluate the influence of the type of light source in the photoactivation on the valuation of color and translucency of new dental composites. 2-To assess the influence of layer thickness on the variation of color and translucency of new dental composites. 3-To study the temporal stability of color and translucency of the new dental composite resins. 4 - For a correct calculation of the variation of color and translucency, to study the variation between the CIELAB color differences E * ab and CIEDE 2000 for dental composites. To achieve these objectives were performed measures color and translucency with a espectrorradiómetro and D65 in samples of two composite systems, Artemis and Esthet-X. To analyze the influence of layer thickness were prepared samples of 0.5, 1 and 2 mm. To analyze the type of light source for each thickness, a group of samples were polimerizaron with high-intensity halogen lamp and a lamp with LEDs. Altogether were prepared 756 samples in which it was determined translucent color or so before and after the polymerization, as 24 hours to thirty days of immersion in artificial saliva. Measuring a month after immersion, identifying the temporal stability of these properties. During the pilot phase of the study will be conducted a total of 3024 steps of color. According to the conditions under which this work was conducted and in accordance with the resutlados obtained, you can conclude that: 1 - The values of the coefficients VAB (E) and (O) GVA found indicate that there are significant differences between the two formulas and therefore, they are not interchangeable. The formula CIEDE2000 should be used in the valuation colorimétirca of dental resins. 2-After the polymerization, chromatic coordinates show a shift toward the region's blue color diagram, regardless of the type of source. However, the composites cured with LEDs show, in general, higher chroma angle and pitch that cured with halogen. S in hand, the value of the color pre-post curing it depends on the light source, is higher if it is for the LEDs- 3-In general, there is a greater change in the translucency when the sample is polymerised with the halogen lamp. However, there was no statistically significant difference (p = 0.758) in connection with the translucency (TP00) between the two groups (polymerised with LED / polymerized halogen). 4-Phase dark color variations that occur decreases with increasing thickness. The main changes are made to coordinate a 'and for luminance, contrary to what happened after the polymerization where the main changes occurred for b'. 5, - bifactorial ANOVA statistical survey conducted shows that the variation of translucency The composite suffering during the dark phase depends significantly and the thickness of the material, not found statistically significant differences between the two types of lamps used. 6, has been valued stability of the chromatic temporary dental composites in two phases: during the dark (24 hours) and 30 days. Both in the dark as a month phase of the polymerization occurs aumetno to coordinate a '. However, we find 8 mos that 2be b 'trend depends on the stage.