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Spektrofotometriska undersökningar Över diffusa ämnens absorptionLundholm, Ernst. January 1912 (has links)
Akademisk auhandling.--Upsala.
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The relationship between soil N, P, K deficiencies and the reflected light for leaves as measured by spectrophotometer.Mohajer-Milani, Parviz. January 1978 (has links)
No description available.
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Improvements to the direct-sun ozone observations taken with the Brewer spectrophotometer /Savastiouk, Vladimir. January 2006 (has links)
Thesis (Ph.D.)--York University, 2006. Graduate Programme in Physics and Astronomy. / Typescript. Includes bibliographical references (leaves 121-134). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://gateway.proquest.com/openurl?url_ver=Z39.88-2004&res_dat=xri:pqdiss&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&rft_dat=xri:pqdiss:NR19809
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The relationship between soil N, P, K deficiencies and the reflected light for leaves as measured by spectrophotometer.Mohajer-Milani, Parviz. January 1978 (has links)
No description available.
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Análise dos dados obtidos com o uso do espectrofotômetro digital intraoral de duas porcelanas dentais após diferentes tratamento de superfície / Analysis of data from digital intraoral spectrophotometer of two dental porcelain after different surface treatmentsCaroli, Angela de 01 July 2009 (has links)
Dentro do aspecto estético atual, a harmonia entre a cor do elemento dental e dos materiais restauradores é um dos quesitos mais relevantes e de maior dificuldade técnica. A utilização de aparelhos para a seleção de cor pelo método digital propõese a diminuir o aspecto subjetivo do processo de visão das cores, minimizando dessa forma possíveis falhas do processo. Este estudo simulou três situações clínicas em peças protéticas cerâmicas na forma de três tratamentos de superfície, um desgaste com ponta de carboneto de silício, um glazeamento a frio e um overglaze em forno para porcelana. Em seguida avaliou-se a interferência dos tratamentos na cor de duas marcas comerciais de porcelana, com e sem a presença de saliva, através do método objetivo de seleção de cor, com auxílio de um espectrofotômetro digital intraoral. Concluiu-se que não houve alteração de cor perceptível ao olho humano de nenhum material sob os tratamentos superficiais realizados, porém, entretanto nota-se uma mudança maior da cor para o tratamento overglaze em relação aos demais tratamentos; a diferença de cor causada pela presença de saliva na porcelana Noritake e os valores encontrados para a porcelana Duceram foram valores perceptíveis ao olho humano treinado em seleção de cor; o tratamento overglaze na porcelana Duceram foi o que maior E promoveu, chegando próximo ao limite aceitável; na presença de saliva os valores de E todos aumentaram para a porcelana Noritake e diminuíram para a porcelana Duceram, indicando que as diferentes composições dos materiais alteram seu comportamento; a diferença entre as medidas com e sem saliva para a porcelana Noritake é mais evidente do que para Duceram; o aparelho é falho em algumas interpretações, mas é aceitável para o uso clínico de tomada de cor; o aparelho não é indicado para tomada de cor em estudos científicos; as análises dos dados L*a*b* não são condizentes com as leituras de cor pelas escalas Vita Classical e 3D Master. / Considering the current aesthetic aspect, the harmony between the color of the tooth and dental restorative materials is one of the issues of greatest importance and technical difficulty. The use of apparatus for the selection of color by digital method proposes to reduce the subjective aspect of the vision of colors, thus minimizing possible failures of the process. This study simulated clinical situations in three prosthetic ceramic pieces in the form of three surface treatments, a scattering using silicon carbide bur, a cold glaze and an overglaze in ceramic oven. Then we evaluate the interference of the treatments on the color of the two porcelains, with and without the presence of saliva using the objective method of color matching, with the aid of a digital intraoral spectrophotometer. It was concluded that there was no change in color perceptible to the human eye of any material on the surface treatments carried out, however, there is a greater change in color for the treatment overglaze when compared to other treatments; the difference in color caused by the presence of saliva in the Noritake and the values found for all treatments in Duceram were visible to the human eye trained on color selection; the treatment overglaze on porcelain Duceram caused the highest E , reaching the acceptable limit; in the presence of saliva values of E increased for Noritake and decreased for Duceram, indicating that the different compositions of materials can alter their behavior; the difference between measurements with and without saliva for Noritake porcelain is more evident than for Duceram; the device is deficient in some interpretations, but is acceptable for the clinical use of color matching; the equipment is not indicated for color matching in scientific studies; the analysis of the data La*b* are not consistent with the readings of the color tabs Vita Classical and 3D Master.
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The in vitro effect of a tooth bleaching agent on coffee and wine stained teeth.Malyi, Emil C. January 2008 (has links)
<p>The aim of this laboratory based study is to assess the efficiency of a tooth bleaching agent by measuring the degree of color change with a spectrophotometer (Konica Minolta, CM 2600d) and not by the usual subjective visual guide methods. Objectives of the study are: To determine tooth shade with a spectrophotometer prior to staining the tooth (baseline). To determine which insult causes the most discoloration numerically. To measure the efficiency of the bleaching agent used in the study with periodic color change pectrophotometer readings.  / To assess if the baseline tooth shade can be regained by the bleaching agent.</p>
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The in vitro effect of a tooth bleaching agent on coffee and wine stained teeth.Malyi, Emil C. January 2008 (has links)
<p>The aim of this laboratory based study is to assess the efficiency of a tooth bleaching agent by measuring the degree of color change with a spectrophotometer (Konica Minolta, CM 2600d) and not by the usual subjective visual guide methods. Objectives of the study are: To determine tooth shade with a spectrophotometer prior to staining the tooth (baseline). To determine which insult causes the most discoloration numerically. To measure the efficiency of the bleaching agent used in the study with periodic color change pectrophotometer readings.  / To assess if the baseline tooth shade can be regained by the bleaching agent.</p>
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Spectrophotometric techniques for the evaluation of frozen pink salmonGupta, Gopi Nath 27 April 1951 (has links)
Graduation date: 1951
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Implementation of a research goniospectrophotometer for appearance research /Miller, R. Mitchell. January 1989 (has links)
Thesis (M.S.)--Rochester Institute of Technology, 1989. / "References": leaves 66-68.
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Influência da fonte fotoativadora e da temperatura da resina composta na infiltração marginal em restaurações dentais submetidas a termociclagemSantos, Rosana Elisabete Agostinho dos 16 August 2018 (has links)
Orientador: Flávio Henrique Baggio Aguiar / Dissertação (mestrado) - Universidade Estadual de Campinas, Faculdade de Odontologia de Piracicaba / Made available in DSpace on 2018-08-16T10:28:55Z (GMT). No. of bitstreams: 1
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Previous issue date: 2010 / Resumo: O objetivo deste estudo "in vitro", foi avaliar a infiltração marginal na interface de restaurações Classe II, restauradas com resina composta, variando o aparelho de fotoativação e a temperatura do compósito, após termociclagem. Noventa cavidades foram preparadas na face proximal de dentes bovinos, e foram divididos aleatoriamente de acordo com o modo de fotoativação (QTH - 420 mW/cm², LED 2° geração - 1100 mW/cm² ou LED 3° geração - 700 mW/cm²) e temperatura da resina composta (23°C, 54°C e 60°C). Após os procedimentos restauradores e a termociclagem, as amostras foram imersas em azul de metileno por 2 horas. As amostras foram moídas e o pó foi preparado para análise em espectrofotômetro de absorbância. Os resultados foram analisados estatisticamente com testes não-paramétricos de Kruskal-Wallis e Dunn (p<0,05). Os resultados mostraram não haver diferença estatística entre os aparelhos de fotoativação na temperatura de 23°C. Na temperatura de 54°C, o grupo fotoativado com QTH mostrou menor infiltração marginal, com diferença estatística para os grupos fotoativados com LED. Para a temperatura de 60°C, QTH mostrou menor infiltração marginal, com diferença estatística para LED 2° geração. Não houve diferença estatística entre as temperaturas da resina composta quando foram usados os LEDs. Para QTH, a temperatura de 54°C mostrou menor infiltração marginal estatisticamente diferente de 23°C. Pode-se concluir que resinas compostas préaquecidas (54°C e 60°C) não melhoraram a infiltração marginal quando se utilizou aparelhos de fotoativação com alta irradiância (LED), entretanto houve uma diminuição da infiltração marginal quando se utilizou aparelhos com baixa irradiância (QTH). / Abstract: The aim of this in vitro study was to evaluate microleakage in Class II cavities restored with dental composite and varying light-curing units and temperature of the composite subjected to a thermocycling test. Ninety cavities were prepared on the proximal surfaces of bovine teeth and randomly divided according to the light-curing mode (QTH - 420 mW/cm2, LED 2nd generation - 1100 mW/cm2, or LED 3rd generation - 700 mW/cm2) and temperature of the composite resin (23ºC, 54ºC, and 60ºC). Following restorative procedures and thermocycling, the samples were immersed in methylene blue for 2 hours. The samples were ground and the powder was prepared for analysis in an absorbance spectrophotometer. All results were statistically analyzed using the nonparametric tests of Kruskal-Wallis and Dunn (p<0.05). The results showed that there was no statistical difference between the light-curing modes at. Temperature of 23ºC. For 54ºC, QTH showed lower microleakage means with statistical differences for the LED groups, and for 60ºC, QTH showed lower microleakage means with statistical differences for LED 2nd generation. There was no statistical difference between the temperatures of the composite resin when LEDs were used. For QTH, 54ºC showed statistically lower microleakage than 23ºC. The group preheated to 60ºC showed no difference for 23ºC and 60ºC. Preheating the composite resin (54ºC and 60ºC) did not improve the microleakage means when high-irradiance LED was used; however, it decreased the microleakage means when a QTH with low irradiance was used. / Mestrado / Dentística / Mestre em Clínica Odontológica
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