Relevant bibliographies by topics / Colorimetry

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Colorimetry'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 June 2025

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Journal articles on the topic "Colorimetry"

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Ciaccheri, Leonardo, Barbara Adinolfi, Andrea Azelio Mencaglia, and Anna Grazia Mignani. "Smartphone-Enabled Colorimetry." Sensors 23, no. 12 (2023): 5559. http://dx.doi.org/10.3390/s23125559.

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A smartphone is used as a colorimeter. The performance characterization for colorimetry is presented using both the built-in camera and a clip-on dispersive grating. Certified colorimetric samples provided by Labsphere® are considered as test samples. Color measurements directly performed utilizing the smartphone camera only are obtained using the RGB Detector app, downloaded from the Google Play Store. More precise measurements are achieved using the commercially available GoSpectro grating and related app. In both cases, to quantify the reliability and sensitivity of smartphone-based color measurements, the CIELab color difference ΔE between the certified and smartphone-measured colors is calculated and is reported in this paper. In addition, as an example of a practical application of interest for the textile industry, several samples of cloth fabrics with a palette of the most common colors are measured, and the comparison with the certified color values is presented.
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Xu, Ning, Shuang Jin, and Li Wang. "Metal nanoparticles-based nanoplatforms for colorimetric sensing: A review." Reviews in Analytical Chemistry 40, no. 1 (2020): 1–11. http://dx.doi.org/10.1515/revac-2021-0122.

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Abstract With the progress of analysis technology and nanotechnology, colorimetric detection has become one of the research hotspots in the field of analytical chemistry. Compared with traditional detection methods, the colorimetric method has many advantages, such as high sensitivity, good selectivity, convenience and fast, as well as low cost. In recent years, metal nanoparticles have been introduced into colorimetry, making the research and application of colorimetry develop rapidly. In this work, we summarize the usual colorimetric detection methods based on metal nanoparticles-based nanozymes and their applications in the last five years. We hope that this work will help readers understand the mechanism and practical application value of nanozyme-based colorimetric biosensors. Meanwhile, this work may give some hints and references for future colorimetric detection research to promote the application and development of nanozyme-based colorimetry in biomedical and environmental analysis.
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Vucāne, Sanita, Ingmars Cinkmanis, and Mārtiņš Šabovics. "Colorimetric Measurements of Vegetable Oils by Smartphone-Based Image Analysis." Proceedings of the Latvian Academy of Sciences. Section B. Natural, Exact, and Applied Sciences. 76, no. 1 (2022): 110–15. http://dx.doi.org/10.2478/prolas-2022-0017.

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Abstract One of the most important indicators of quality of vegetable oils is colour, which can be detected with colorimetric measurements. The determination of colour is traditionally done using colorimeters, spectrometers, tintometers, and other analytical equipment. As an alternative to replace the classical analytical methods, smartphone-based colorimetry using digital image analysis can be used. For colorimetric detection of colour in vegetable oils, a Huawei P30 lite smartphone and android application “Colour Picker” with an image matching algorithm RGB model was used. The image of sample and standard solutions was captured in a polyvinyl chloride box with light-emitting diode (LED) lamps. The aim of the study was to detect the colour of vegetable oils with smartphone-based image analysis. The detected colour of eleven vegetable oils (sea buckthorn, sunflower, rice, macadamia nut, hemp, corn, grape, linseed, rapeseed, olive, and milk thistle oils) was compared with standard solutions of iodine with a concentration range from 0 to 100 mg·100 ml−1. The results show that smartphone-based colorimetry can be used for detection of the colour of vegetable oils and it is possible to compare the colour with standard solutions of iodine. The colour of vegetable oils was expressed as the colour number obtained from an iodine standard solution prepared in deionised water.
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Li, Xianming, Lu Gao, Feng Li, Xiandeng Hou, and Peng Wu. "Universal and label-free photosensitization colorimetric assays enabled by target-induced termini transformation of dsDNA resistant to Exo III digestion." Chemical Communications 55, no. 50 (2019): 7211–14. http://dx.doi.org/10.1039/c9cc03551f.

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Lixiu, He, Hu Yuefei, and Lv Zhiqiao. "Research Progress in Detection of Explosives by Chemical Colorimetric Method." Expert Review of Chinese Chemical 2, no. 1 (2024): 1–4. http://dx.doi.org/10.62022/ercc.issn3006-0095.2024.01.001.

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This article reviews the current application status and research progress of colorimetric detection methods based on chemical colorimetry in the detection of explosives.It mainly introduced colorimetric sensors, colorimetric sensor arrays, and chemical colorimetric sensors based on novel material substrates. The application prospect of chemical colorimetric method in the field of explosives detection was prospected.
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Zhbanova, Vera L. "Features Of Digital Colourimetry Application in Modern Scientific Research." Issue 03-2021, no. 03-2021 (June 2021): 146–58. http://dx.doi.org/10.33383/2021-028.

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The paper is devoted to digital colorimetry, has a character of review, and deals with the main issues of colorimetric calculations and transformations during digital colour registration. The presented materials are intended to help researchers already at the stage of registration to exclude colour losses and, accordingly, errors of measurements, taking into account the following features: – The connection of colorimetric measurements with digital circuit design is shown, which results in digital colorimetry as a tool for acquiring and processing accurate colour information about the object of study; – Important issues such as: selection criteria for parameters of photodetector arrays, colour separation systems, working colour spaces, formats of colour images, and post-processing methods for colour information of images; – Colour separation systems of photodetector arrays, their advantages and disadvantages, influence on the registration result and prospects of new developments in this field are described; – Working colour spaces of digital recording systems, and also colour systems are considered allowing maximum saving colour parameters of digital impression; – To understand human colour perception, the problem of hardware-independent reproduction of colour and images after image registration is considered; – It is proposed to use such colorimetric systems in the analysis of colour parameters in scientific studies, which give understanding of human image perception in the analysis of image quality. The paper gives a broad overview of the digital colorimetry main aspects and researches on this topic for specialists who use digital colour recorders as a tool in their experimental research. This material can also be useful for specialists with deep knowledge in colorimetry who use digital colour recorders as part of their main tasks in the definite field of science and technology.
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Liu, Xiaoting, Dan Wu, Abbas Ali Abid, Ying Liu, Jianfeng Zhou, and Qichun Zhang. "Determination of Paddy Soil Ammonia Nitrogen Using Rapid Detection Kit Coupled with Microplate Reader." Toxics 10, no. 12 (2022): 725. http://dx.doi.org/10.3390/toxics10120725.

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Indophenol blue colorimetry has been widely used for determining soil ammonia nitrogen, but this method has some disadvantages, such as complex reagent preparation, high toxicity, and long colorimetric time. Hence, we aimed to develop a rapid soil ammonia nitrogen determination method using a rapid detection kit. In order to select a suitable extractant, different concentrations of KCl and NaCl solutions were used to extract soil. The ammonia nitrogen content in different types of soils was determined using a rapid detection kit (purchased from Zhejiang Luheng Environmental Technology Limited Company) coupled with a microplate reader. The kit method was compared with the traditional indophenol blue colorimetry method. The results showed no significant difference between the 1 mol·L−1 KCl extraction kit method and indophenol blue colorimetry (p > 0.05). The linearity of the working curve was smooth, the linear detection range was 0.0–2.00 mg·L−1, the average relative standard deviation was 7.00% (n = 5), the standard addition recovery rate was 89.31–118.23%, and the detection limit were was 0.074 mg·L−1. We concluded that the 1 mol·L−1 KCl extraction kit method can be applied to determine the ammonia nitrogen content of paddy soil with different chemical properties. The 1 mol·L−1 KCl extraction kit method has the advantage over indophenol blue colorimetry due to its simple reagent preparation, convenient operation, and shorter detection time (the coloring and colorimetric time for 96 samples was only 30 min using the kit method coupled with a microplate reader). Hence, it has the potential for application due to its rapid determination of soil samples in large quantities.
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Du, Bin, Shu Geng, Wei Cao, et al. "Investigation of the Colorimetric Characteristics of VX in Squaraine-Based Solutions." Chemosensors 11, no. 2 (2023): 137. http://dx.doi.org/10.3390/chemosensors11020137.

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Colorimetry is an important on-site detection method for organophosphorus compounds. O-Ethyl S-(2-diisopropylaminoethyl) methylphosphonothioate (VX) is recognized as one of the deadliest organophosphorus chemical agents, and the rapid on-site detection of VX is of great significance to public safety. In this paper, a squaraine derivative was synthesized as probe molecules, and the sensing characteristics of VX in a colorimetric solution system containing tetrabutylammonium fluoride (TABF) were studied with UV−Vis spectroscopy, nuclear magnetic resonance (1H NMR), and mass spectrometry. The results showed that the binding of the thiol moiety of VX to the quaternary ring of the squaraine probe changed the molecular conjugation system, and that the rapid colorimetric detection of micro-trace VX was achieved based on color change before and after interaction with squaraine, enabling the detection limit of VX to be as low as 0.4 μg/mL. Moreover, the colorimetry method also possessed satisfactory sensitivity and could detect VX from other organophosphorus pesticides (e.g., parathion and dichlorvos), phosphorus-containing reagents (e.g., diethyl chlorophosphate and dimethyl methylphosphonate), a benzene series (e.g., toluene), and acid and base agents (e.g., acetic acid and triethylamine, respectively), which demonstrated that squaraine-based colorimetry could provide fast, on-site measurement results for VX detection. The strategy of this research could be extended as a common approach for the detection of other organophosphorus nerve agents or organophosphorus pesticides.
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Matula, J. "Determination of dissolved reactive and dissolved total phosphorus in water extract of soils." Plant, Soil and Environment 57, No. 1 (2011): 1–6. http://dx.doi.org/10.17221/185/2010-pse.

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The simplified acid peroxydisulphate digestion of soil water extract was evaluated for determination of total dissolved phosphorus by molybdenum-blue colorimetry in comparison with direct P-detection in water extract by the ICP-AES technique. The research was conducted on 79 agricultural soils with different agrochemical characteristics. The results of the colorimetric P detection in water extract without digestion and ICP phosphorus detection were different. The median of values determined by ICP-AES was 1.7 times higher than that of colorimetry, but the correlations between the two measurements were quite close (r = 0.993). Differences between the colorimetric phosphorus and ICP-AES phosphorus were irregular, increasing as the phosphorus level in soils decreased. The simplified procedure of acid peroxydisulphate digestion is useful for routine determination of total water-extracted phosphorus in soils when the soil testing laboratory is not equipped with the ICP-AES technique. The two-tailed paired t-test did not prove any difference in the values between the direct ICP-AES P-detection in water extract of soils and colorimetric P-detection in the acid peroxydisulphate digest.  
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ZANUNCIO, ANTONIO JOSÉ VINHA, EMANUEL ARNONI COSTA, AMÉLIA GUIMARÃES CARVALHO, VINÍCIUS RESENDE DE CASTRO, ANGÉLICA DE CASSIA OLIVEIRA CARNEIRO, and SOLANGE DE OLIVEIRA ARAÚJO. "ARTIFICIAL INTELLIGENCE AND COLORIMETRY AS A COMBINED NON-DESTRUCTIVE METHOD TO PREDICT PROPERTIES OF HEAT-TREATED WOOD." Cellulose Chemistry and Technology 56, no. 9-10 (2022): 941–48. http://dx.doi.org/10.35812/cellulosechemtechnol.2022.56.84.

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Colorimetric evaluation is practical, accurate and fast. Starting from the generally established fact that a heat treatment changes the wood properties, the present paper aimed to predict the properties of heat-treated wood by using colorimetry and artificial neural networks (ANNs). Eucalyptus grandis and Pinus caribaea wood samples were heat-treated to evaluate their color, as well as physical and mechanical properties. The relationship between the wood color and its physical and mechanical properties was evaluated through multilayer perceptron (MLP) neural network. The heat treatment darkened the wood, increased its dimensional stability and reduced its mechanical resistance. Artificial neural networks based on colorimetric and temperature parameters were efficient in modeling the wood properties, with better results to predict its physical parameters. The coefficient of determination (R2) of the models was high and the root mean squared error (RMSE%) low – with homogeneous distribution. The findings suggest that colorimetry is adequate as a non-destructive tool to evaluate heat-treated wood.
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Dissertations / Theses on the topic "Colorimetry"

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Shen, Shizhe. "Color difference formula and uniform color space modeling and evaluation /." Online version of thesis, 2009. http://hdl.handle.net/1850/11356.

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Xue, Yang. "Uniform color spaces based on CIECAM02 and IPT color difference equations /." Online version of thesis, 2008. http://hdl.handle.net/1850/8424.

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Sousa, Ana Carolina Rafanhin. "Desenvolvimento de um teste rápido microfluídico para detecção de sulfonamidas em leite a partir de ensaios colorimétricos." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/75/75135/tde-21102016-144946/.

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O uso de antibióticos em animais de produção pode ser ministrado de diferentes formas: i) como método de prevenção de doenças, ii) como tratamento e combate de doenças como mastite, infecções respiratórias, genitais e oftálmicas, e iii) aplicados às rações, a fim de aumentar o ganho de peso, promovendo também a eficiência de aproveitamento dos alimentos e tornando menores os índices de morbidez e mortalidade. No entanto, alguns produtores utilizam os antibióticos de forma inadequada, ministrando o mesmo em dosagens superiores às recomendadas ou até mesmo adicionando os antibióticos diretamente no leite, a fim de inibir o crescimento indesejável de bactérias, o que pode causar graves riscos à saúde humana. Uma das maneiras de se detectar resíduos de antibióticos (sulfonamidas) em leite é a partir da reação enzimática entre a anidrase carbônica e um éster (4-nitrofenil acetato), que gera uma coloração amarelo brilhante. As sulfonamidas inibem tal reação, impedindo o surgimento de cor. Dispositivos microfluídicos fabricados em papel (&mu;AD) foram desenvolvidos como um novo método simples, rápido, portátil e de baixo custo, a fim de se detectar a presença ou ausência das três principais sulfonamidas (sulfametazina, sulfadimetoxina e sulfatiazol), como exigido pela Agência Nacional de Vigilância Sanitária (ANVISA). A imobilização de uma fina camada uniforme de pasta de metil celulose, nos spots dos microdispositivos, permitiu maior estabilidade na superfície reacional do papel, de forma a alcançar limites de detecção (LOD) menores, equivalentes à 2,80 &mu;mol L-1 (7,79x10-7 g mL-1) para a sulfametazina, 2,70 &mu;mol L-1(8,37x10-7 g mL-1) para a sulfadimetoxina e 2,50 &mu;mol L-1 (6,38x10-7 g mL-1) para o sulfatiazol. O método apresentou, como principal vantagem, a análise das amostras de leite bovino sem qualquer tratamento prévio. Além disso, o método apresentou boa linearidade e repetitividade nos ensaios realizados intra-dia e inter-dia, além de se mostrar seletivo para compostos da classe das sulfonamidas, mostrou-se também robusto com relação a alterações na temperatura do leite bovino. Dessa forma, o teste pode ser transportado para a área rural, sem a necessidade de um profissional especializado, a fim de se obter um diagnóstico local rápido, simples e de baixo custo, para a qualidade do leite.<br>The use of antibiotics in animal production can be delivered in diferent ways: i) as a method of preventing disease in animals, ii) as treatment and combat diseases such as mastitis, respiratory infections, genital infections and ophthalmic infections, and iii) applied to the feed in order to increase the weight gain of the animals, promoting the efficiency of food utilization, and making lower the morbidity and mortality. However, some producers use antibiotics improperly, administering it in doses higher than those recommended or even directly adding antibiotics to the milk, in order to inhibit the unwanted growth of bacteria. This fact alone can cause serious risks to human health. One way of detecting antibiotic residues (sulfonamides) in milk, is using the enzymatic reaction between an ester (4-nitrophenyl acetate) and carbonic anhydrase, which gives a bright yellow color. The sulfonamides inhibit this reaction, preventing color appearance. Paper-based microfluidic devices (&mu;PAD) have been developed as a new simple, fast, portable and inexpensive, in order to detect the presence or absence of the three most common sulfonamides (sulfamethazine, sulfadimethoxine and sulfathiazole), as required by the National Agency of Sanitary Surveillance (ANVISA). The immobilization of a uniform thin layer of methyl cellulose pulp on the spots of microdevices, allowed greater stability in the reaction surface of the paper, and achieved lower limits of detection (LOD) than without the additive, equivalent to 2.80 5mol L-1 (7.79x10-7 g mL-1)for sulfamethazine, 2.70 5mol L-1 (8.37x10-7 g mL-1) for sulfadimethoxine and 2.50 5mol L-1 (6.38x10-7 g mL-1) for sulfathiazole. The principal advantage of this method is that allows the analysis of bovine milk samples without any prior treatment. Furthermore, the method i) has good linearity and repeatability in tests performed intra-day and inter-day, ii) shows selectivity for compounds of the sulfonamide class, and iii) is robust to changes in bovine milk temperature. Thus, the test can be transported to the rural area, without a specialized professional, providing locally a fast, simple and low cost diagnostic for the presence of sulfonamide antibiotics in milk.
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Pires, Laís Alcântara. "Avaliação da influência do processo de confecção e da espessura da cerâmica, do substrato e do cimento na cor final da cerâmica de dissilicato de lítio." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/25/25146/tde-29012014-170051/.

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O propósito deste trabalho foi avaliar, in-vitro, a alteração de cor da cerâmica de dissilicato de lítio (IPS e.max Ivoclar Vivadent AG), variando-se os seguintes aspectos: processo de confecção (cerâmica monolítica e com a infraestrutura coberta por cerâmica de revestimento), espessura da cerâmica (1,5 e 2,0mm) e substrato (resina e liga metálica), com e sem cimento. Para isso foram confeccionadas 40 pastilhas de cerâmica IPS e.max Press (Ivoclar Vivadent AG), que foram divididas em 2 grupos (n=20): LT (cerâmica de baixa translucidez na cor A2) e HO (cerâmica de alta opacidade). Neste último grupo, as pastilhas foram confeccionadas com 0,5mm de espessura revestidas com cerâmica IPS e.max Ceram na cor A2 (Ivoclar Vivadent AG) com espessuras de 1,0 e 1,5mm. Foram utilizados substratos em resina composta (n=20) e liga metálica (n=20). Para o substrato em resina foi empregada a resina Filtek® Z250 XT, na cor A2 (3M ESPE) e para o substrato em liga metálica foi utilizado a liga de cobre-alumínio (Goldent L.A,). Para a cimentação foi utilizado o cimento de polimerização dual, Variolink II, (Ivoclar Vivadent AG), na cor translúcida. A leitura da cor foi realizada em um espectrofotômetro (Minolta CM2600d), equipado com fonte de luz padrão D65 (luz do dia). A cor determinada no aparelho é expressa em coordenadas CIE L* a* b* e os valores correspondentes foram utilizados para calcular o &#x394;E. Foram feitas comparações do grupo somente com a cerâmica (controle) versus os grupos cerâmica-substrato sem e com cimento; e dos grupos cerâmica-substrato sem cimento (controle) versus cerâmica-substrato com cimento. Os dados foram submetidos a análise estatística (ANOVA e teste de Tukey, p<0,05). Quando foram comparados o grupo somente com a cerâmica (controle) versus os grupos cerâmicasubstrato sem e com cimento, os resultados mostraram que o menor valor (&#x394;E=3,0) foi o do grupo HOA2 com 2mm de espessura, substrato de metal e sem cimento; o maior valor encontrado (&#x394;E=10,0) foi do grupo LTA2 com 1,5mm de espessura, com substrato de metal e com cimento. Esta diferença foi estatisticamente significante. E quando foram comparados os grupos cerâmica-substrato sem cimento (controle) versus cerâmica-substrato com cimento os resultados apontaram que o grupo que teve menor influência do cimento foi o HOA2 com 1,5mm de espessura e substrato de resina (&#x394;E=1,1); o grupo que teve maior influência do cimento foi o LTA2 com 1,5mm de espessura e com substrato de metal (&#x394;E=6,4). Esta diferença foi estatisticamente significante. Dentro das limitações deste estudo, concluiu-se que as variáveis pesquisadas o processo de confecção e a espessura da cerâmica, a cor do substrato e a presença do cimento, influenciaram significativamente na cor da cerâmica.<br>The purpose of this study was to evaluate in vitro, the color change of the ceramic lithium disilicate (IPS e.max - Ivoclar Vivadent AG), varying the following aspects: manufacture process (monolithic ceramic and the infrastructure with ceramic covering), the thickness of the ceramic (1.5 and 2.0 mm) and the abutment substrate (composite resin and alloy), with and without cement. Forty discs were fabricated with ceramic IPS e.max Press (Ivoclar Vivadent AG), which were divided into two groups (n = 20): LT (low translucency, shade A2) and HO (high opacity). In the latter group, the discs were fabricated with a 0.5 mm thickness with the IPS e.max Ceram ceramic covering, shade A2 (Ivoclar Vivadent AG) with 1.0 and 1.5 mm thicknesses. The abutments substrates were composite resin (n = 20) and alloy (n = 20). The composite resin substrate was made with the Filtek Z250 XT ®, shade A2 (3M ESPE) and the metallic alloy substrate was made with aluminum-copper alloy (Goldent LA). The cementation was realized with dual cure cement Variolink II, translucent color (Ivoclar Vivadent AG). The color was measured in a spectrophotometer (Minolta CM2600d) equipped with a D65 light (daylight). The color determined on the equipment is expressed in coordinates CIE L * a * b *, and those values were used to calculate the &#x394;E. The comparisons were only made between the ceramic groups (control) versus the ceramic-substrate with and without cement; and the ceramic-substrate without cement groups (control) versus the ceramic-substrate with cement. The data were subjected to statistical analysis (ANOVA and Tukey test, p < 0.05). When the comparisons between the groups were only the ceramic (control) versus the ceramic-substrate groups, without and with cement, the results showed that the smallest value (&#x394;E=3.0) of the HOA2 group with 2 mm of thickness, metal substrate and without cement; the largest value found (&#x394;E=10.0) was that of the LTA2 group with a 1.5 mm thickness, with a metal substrate and with cement. This difference was statistically significant. When the comparisons were between the ceramic-substrate without cement groups (control) versus the ceramic-substrate with cement groups, the results showed that the group that had less influence of the cement was the HOA2 group with a 1.5 mm thickness with a composite resin substrate (&#x394;E=1.1). The group that had the greatest influence of the cement was the LTA2 with a 1.5 mm thickness and with a metal substrate (&#x394;E=6.4). This difference was statistically significant. Within the limitations of this study, it is concluded that the studied variables - the manufacture process and the thickness of ceramic, the color of the abutment substrate and the presence of the cement has a significant influence on the color of the ceramic.
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Pires, Laís Alcântara. "Avaliação da influência do processo de confecção e da espessura da cerâmica, do substrato e do cimento na cor final da cerâmica de dissilicato de lítio, após o envelhecimento artificial acelerado." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/25/25146/tde-23042018-220311/.

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O propósito deste trabalho foi avaliar, in-vitro, a alteração de cor da cerâmica de dissilicato de lítio, após o envelhecimento artificial acelerado (EAA), variando-se os seguintes aspectos: processo de confecção (cerâmica monolítica e com infraestrutura coberta por cerâmica de revestimento), espessuras de 1,5 e 2,0mm e substratos de resina e liga metálica, com e sem cimento. Para isso foram confeccionadas 40 pastilhas de cerâmica IPS e.max Press, que foram divididas em 2 grupos (n=20): LT (cerâmica de baixa translucidez na cor A2) e HO (cerâmica de alta opacidade). Neste grupo as pastilhas foram confeccionadas com 0,5mm de espessura e, posteriormente, revestidas com a cerâmica IPS e.max Ceram na cor A2 e com espessuras de 1,0 e 1,5mm. Foram utilizados substratos em resina composta (n=20) e em liga metálica (cobre-alumínio) (n=20). Para a cimentação foi utilizado o cimento de polimerização dual Variolink II, na cor translúcida. A leitura da cor foi realizada em um espectrofotômetro (Minolta CM2600d), equipado com fonte de luz padrão D65 (luz do dia). A cor determinada no aparelho é expressa em coordenadas CIE L* a* b* e os valores correspondentes foram utilizados para calcular o E. Foram feitas as seguintes comparações: discos de cerâmica antes do EAA vs discos de cerâmica cimentadas sobre os substratos antes do EAA; discos de cerâmica cimentadas sobre os substratos antes do EAA vs discos de cerâmica cimentadas sobre os substratos após o EAA; discos de cerâmica antes do EAA vs discos de cerâmica cimentadas sobre os substratos após o EAA; discos de cerâmica antes do EAA vs discos de cerâmica após o EAA. Os dados foram submetidos a análise estatística (ANOVA) a 3 critérios e (ANOVA) a 2 critérios e testes de Tukey, p<0,05). Os resultados mostraram que: 1. os grupos somente de discos de cerâmica vs discos de cerâmica com 1,5 e 2,0mm de espessuras, cimentadas em substratos de resina e liga metálica, antes do EAA. O menor valor encontrado de E (E=3,6) foi com o grupo de discos da cerâmica HOA2 com 2mm de espessura cimentados em substrato de metal, seguido pelo grupo da mesma cerâmica com 1,5mm de espessura cimentada em substrato de resina. O maior valor encontrado (E=10,0) foi com os discos de cerâmica LTA2 com 1,5 e 2mm de espessuras e cimentados em substrato de metal; 2. os grupos com discos de cerâmicas com 1,5 e 2,0mm de espessuras e cimentados em substratos de resina e liga metálica antes do EAA vs o mesmo grupo após EAA. Os grupos de discos com a cerâmica HOA2 com 2mm de espessura cimentados em substrato de metal teve menor alteração de cor (E=1,1) e a maior alteração de cor ocorreu com o grupo da cerâmica LTA2 com 2mm de espessura cimentada em substrato de metal (E=2,1); 3. os grupos somente com discos de cerâmica antes do EAA vs grupos de cerâmicas com discos de 1,5 e 2,0mm de espessuras e cimentados em substratos de resina e liga metálica após o EAA. O menor valor encontrado (E=3,7) foi com a cerâmica HOA2 com revestimento e 2mm de espessura cimentada em substrato de metal. O maior valor encontrado (E=10,0) foi o da cerâmica LTA2 com 1,5 e 2mm de espessuras cimentadas em substrato de metal; 4. os grupos discos de cerâmica, antes e após o processo de EAA O grupo que teve menor alteração de cor foi o da cerâmica HOA2 com 1,5mm (E=0,6). O grupo que teve maior alteração de cor foi o da cerâmica LTA2 com 2mm (E=2,2). Concluiu-se que o EAA causou alteração na cor final das cerâmicas de dissilicato de lítio, levando-se em conta as variáveis pesquisadas.<br>The purpose of this in vitro study was to evaluate the color changing of the lithium disilicate ceramic discs after accelerated artificial aging (AAA) varying the following aspects: manufacturing process (monolithic ceramic and infrastructure with ceramic covering), thickness of the ceramic (1.5 and 2.0 mm) and abutment substrate (composite resin and alloy), with and without cement. Forty ceramic discs were fabricated with ceramic IPS e.max Press and divided into two groups (n = 20): LT (low translucency, shade A2) and HO (high opacity). In the HO group, the discs were fabricated with a thickness of 0.5 mm of the IPS e.max Ceram combined with a thickness of 1 or 1.5mm of veneering ceramic, shade A2. The abutments substrates were fabricated with composite resin (n = 20) and metallic alloy (n = 20). The resin cement used was Variolink II translucent color. Color was measured with a spectrophotometer and expressed in CIE L * a * b * coordinates. Color differences (E) were calculated. The data were analyzed with ANOVA and the Tukey HSD test (p <0.05).The results showed that 1.in the groups of ceramic discs vs. ceramic discs with 1.5 and 2.0mm thickness, cemented on resin substrates and metal alloy, before AAA, the lowest value of E (E = 3,6) was obtained for HOA2 ceramic discs with 2mm thickness cemented in metal substrate, followed by ceramic discs with 1.5mm thickness cemented in substrate of resin. The highest value (E = 10.0) was observed for ceramic discs LTA2 with 1.5 and 2mm thickness and cemented in metal substrate; 2. In the groups with ceramic discs with 1.5 and 2.0mm thickness and cemented on resin and metal substrates prior to AAA vs the same group after AAA, the HOA2 ceramic discs with 2mm thickness cemented on a metal substrate had the smallest color change (E = 1,1) and the largest occurred for LTA2 with 2mm thickness and cemented in metallic substrate (E = 2.1); 3. In the groups of ceramic discs before AAA vs groups of ceramic with discs of 1.5 and 2.0mm of thickness and cemented on resin substrates and metal alloy after AAA, the lowest value (E = 3,7) was obtained for HOA2 veneering ceramic 2mm thickness cemented on a metal substrate. The highest value found (E = 10.0) was for LTA2 ceramic with 1.5 and 2mm thickness cemented on a metal substrate; 4. comparing the groups of ceramic discs before and after the AAA process, the lowest color change was obtained for HOA2 ceramic with 1.5mm (E = 0.6) and the greatest color change was fore LTA2 ceramic with 2mm (E = 2.2). It was concluded that the AAA caused alteration in the final color of the lithium disilicate ceramics, taking into account the variables studied.
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Maroto, Fernández Enric. "Image analysis of bacterial colonies in classic and alternative gel-based growth media." Doctoral thesis, Universitat Autònoma de Barcelona, 2018. http://hdl.handle.net/10803/666842.

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La adopción de tecnologías automatizadas de análisis de imagen va en aumento en los laboratorios de microbiología, éstas suponen un medio para incrementar la productividad, la objetividad y la trazabilidad de los resultados de las pruebas. Específicamente, la enumeración de colonias y la detección del desarrollo de color en éstas constituyen las dos aplicaciones más comunes de la visión artificial en el laboratorio microbiológico. En el albor de la era de la visión computarizada, el contaje y análisis de colonias se posiciona como una tarea más que automatizar mediante la inteligencia artificial aplicada al análisis de imagen. La presente tesis evalúa la capacidad de los escáneres flatbed para capturar imágenes para la detección y medida del desarrollo de color en colonias. Así mismo, se evalúa la incidencia que distintas concentraciones de cromógenos tienen sobre el desarrollo de color a lo largo del tiempo. Se sugieren aproximaciones asequibles para interpretar los datos obtenidos y se profundiza en el análisis del desarrollo de color. Los aspectos metrológicos de la técnica presentada son debidamente abordados. Se presta particular atención a la caracterización de la técnica empleada, a resaltar sus limitaciones y a evaluar la reproducibilidad de los resultados obtenidos en distintos dispositivos. Se aportan los primeros datos en relación a la enumeración de colonias aplicando técnicas cinéticas de toma de imagen en medios de cultivo alternativos. Así mismo, se evalúa el tiempo hasta detección de las colonias, junto con la recuperación de estas como medios para estudiar la inducción de estrés vinculada a la presencia de matrices potencialmente tóxicas.<br>Microbiology laboratories are increasingly adopting automated imaging technologies as means to leverage their productivity and increase traceability and objectivity of test results. Specifically, colony enumeration and detection of color development in these stand as the two most common applications of machine vision in microbiology laboratories. In the advent of the age of computer vision, colony counting and analysis stands as yet another process that can be automated by means of image-driven artificial intelligence. The present work assesses the capacity of flatbed scanners to capture images for the detection and measurement of color development in colonies. Effects of different concentrations of chromogens and the differences in color development over time are evaluated. Affordable approaches to interpret derived data are suggested and insights related to the analysis of color development are supplied. Metrological aspects of the measurement technique are duly addressed. Thus, particular care is devoted to characterize the measurement technique employed, to highlight its limitations, and to assess the cross-device reproducibility of obtained results. First-in-class accounts of enumeration of colonies in alternative culture media, based on kinetic imaging of their growth, are also reported. Furthermore, time to the earliest detection of colonies is evaluated, along with colony recovery evaluation, as a means to assess stress induction related to the presence of potentially toxic matrices.
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Fredrick, Stephen M. "Quantization of color images using the modified median cut algorithm." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-12232009-020426/.

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Casale, Giuseppe Rocco. "Assessment of solar UV exposure in the Italian population." Doctoral thesis, La Sapienza, 2007. http://hdl.handle.net/11573/916827.

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Marini, Christopher Nicholas. "Colorimetry and historic ceramics| Using a tristimulus colorimeter to improve the identification and analysis of historic ceramics." Thesis, Indiana University of Pennsylvania, 2013. http://pqdtopen.proquest.com/#viewpdf?dispub=1543834.

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<p> Ceramics are among the most useful artifact types in historical archaeology. Identifying different earthenware types is often difficult, especially when the sherds lack diagnostic features. The purpose of this study was to determine if the colors of ceramics can be used to identify pearlware, creamware, and whiteware sherds that lack diagnostic features. A colorimeter was used measure the color of the glazes and pastes from 1929 scans of sherds categorized by experts in museum collections. Several statistical tests were performed on the data set, including ANOVA, multiple comparison, and discriminate analysis. Results from ANOVA indicated that creamware, pearlware and whiteware had different mean color values. Multivariate analysis was used to group the observations and indicated that color can be used to identify creamware, pearlware, and whiteware, but only if a color standard can be generated to compare against because colorimetric analysis can roughly duplicate the results of a single expert.</p>
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Ozorio, Jose Estevam Vieira. "Avaliação da quantidade de formaldeído liberado por alguns cimentos endodônticos." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/58/58133/tde-22052012-171258/.

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Analisou-se, por meio de espectrofotometria, a liberação de formaldeído de cimentos endodônticos à base de óxido de zinco e eugenol, resinas epóxica e polimetacrilato, hidróxido de cálcio e biocerâmico, estudados em diferentes oportunidades: durante a espatulação; decorrido três vezes o tempo de endurecimento e, por fim, na extração de sua massa endurecida. As amostras foram adquiridas pela coleta do volume da água utilizada em cada período e, determinada a curva de calibração da liberação do formaldeído e análise controle com água, foram submetidas à análise colorimétrica com adição dos reagentes: 5,0 mL de solução tampão, 0,5 mL de solução de parafenilenodiamina e 2,5 mL de peróxido de hidrogênio em balões volumétricos de 50,0 mL mantendo-os em repouso por 20 minutos. Após, foi realizada leitura em espectrofotômetro duplo feixe nos comprimentos de onda 326, 334 e 462 nm. Detectou-se formaldeído em todos os cimentos à base de resina epóxica, no EndoREZ® e no Endomèthasone N, quantificado apenas no Sealer 26 (7.40 mg.L-1) e Endomèthasone N (9.13 mg.L-1) durante a espatulação; no AH Plus® (4.44 mg.L-1) e no Endomèthasone N (18.14 mg.L-1) durante o endurecimento, e somente no Endomèthasone N depois de endurecido (9.43 mg.L- 1). Concluiu-se que, durante a espatulação, todos os cimentos de resina epóxica liberaram formaldeído, com quantificação apenas para o Sealer 26, o Endomèthasone N apresentou a maior quantidade, e o Endorez liberou a substância em quantidade insuficiente para quantificação. Após a espatulação, todos os de resina epóxica liberaram formaldeído, com quantificação no AH Plus e o Endomèthasone N apresentou a maior quantidade da substância, que também foi encontrada no Endorez, sem quantificação. Endurecidos, todos os cimentos de resina epóxica e o Endorez liberaram formaldeído em quantidade insuficiente para quantificação, e o cimento Endomèthasone N liberou a maior quantidade dessa substância.<br>This study evaluated, by means of spectrophotometry, the release of formaldehyde in zinc oxide, epoxy resins and polymethylmethacrylate, calcium hydroxide and bioceramic based endodontic sealers in different situations: during mixing; after 3 time the setting time and, at extraction of its hardened mass. The samples were acquired by means of collection of the volume of water used in each period and - after determining the calibration curve of formaldehyde release and analyzing the control with water - were submitted to colorimetric analysis with the addition of the following reagents: 5.0mL of buffered solution, 0.5mL of paraphenylenediamine and 2.5mL of hydrogen peroxide to a 50.0mL volumetric flask, which was kept at rest for 20 minutes. Double-beam spectrophotometer readings were performed at 326, 334 and 462nm wavelengths. Formaldehyde was detected in all epoxy resin based sealers, in EndoREZ and in Endomèthasone N, quantified only in Sealer 26 (7.40 mg.L-1) and Endomèthasone N (9.13 mg.L-1) during mixing, and in AH Plus (4.44 mg.L-1) and Endomèthasone N (18.14 mg.L-1) during the setting time, and only in Endomèthasone N after setting (9.43 mg.L-1). It can be concluded that during mixing all epoxy resin based sealers released formaldehyde, with quantification being possible only for Sealer 26, Endomèthasone N showed higher quantities, and Endorez released the substance in insufficient quantity for detection. After mixing, all epoxy resin based sealers released formaldehyde, whereas quantification was possible for AH Plus and Endomèthasone N presented the highest quantity of the substance, that was also found in Endorez, but could not be quantified. When set, all epoxy resin sealers and Endorez released formaldehyde in insufficient quantity for quantification, and Endomèthasone N released the greater amount of this substance.
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Books on the topic "Colorimetry"

1

Ohta, Noboru, and Alan R. Robertson. Colorimetry. John Wiley & Sons, Ltd, 2005. http://dx.doi.org/10.1002/0470094745.

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Schanda, Jnos, ed. Colorimetry. John Wiley & Sons, Inc., 2007. http://dx.doi.org/10.1002/9780470175637.

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Illumination, International Commission on. Colorimetry. 2nd ed. Central Bureau of the CIE, 1986.

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Ohta, Noboru. Colorimetry. John Wiley & Sons, Ltd., 2006.

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Oleari, Claudio, ed. Standard Colorimetry. John Wiley & Sons, Ltd, 2015. http://dx.doi.org/10.1002/9781118894477.

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Bailey, Nicola Ann. Modulated differential scanning colorimetry. University of Birmingham, 1998.

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A, Robertson Alan, ed. Colorimetry: Fundamentals and applications. Wiley, 2005.

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János, Schanda, ed. Colorimetry: Understanding the CIE system. Wiley, 2007.

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1910-, MacAdam David L., ed. Selected papers on colorimetry-fundamentals. SPIE Optical Engineering Press, 1993.

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1-38, CIE Technical Committee TC. Recommended practice for tabulating spectral data for use in colour computations. CIE Central Bureau, 2005.

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Book chapters on the topic "Colorimetry"

1

Gooch, Jan W. "Colorimetry." In Encyclopedic Dictionary of Polymers. Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2644.

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Dinet, Eric. "Colorimetry." In Optics in Instruments. John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118744321.ch5.

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Parkin, Alan. "Colorimetry." In Digital Imaging Primer. Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-540-85619-1_16.

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Devi, Rooma, Aman Chauhan, Simmi Kharb, and Chandra Shekhar Pundir. "Colorimetry." In Clinical Biochemistry. Jenny Stanford Publishing, 2023. http://dx.doi.org/10.1201/9781003455660-14.

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Yunpeng, Gao. "The Colorimetry." In The ECPH Encyclopedia of Psychology. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-99-6000-2_1038-1.

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Khasim, S. M., K. Thammasiri, S. Rama Rao, and M. Rahamtulla. "Colorimetry and Spectrophotometry." In Plant Techniques. CRC Press, 2024. http://dx.doi.org/10.1201/9781003503682-8.

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Koenderink, Jan J., and Andrea J. van Doorn. "The Structure of Colorimetry." In Algebraic Frames for the Perception-Action Cycle. Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/10722492_4.

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Erdem, Talha, and Hilmi Volkan Demir. "Colorimetry for LED Lighting." In SpringerBriefs in Applied Sciences and Technology. Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-5886-9_3.

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Martens, Jean-Bernard. "Color Perception and Colorimetry." In Image Technology Design. Springer US, 2003. http://dx.doi.org/10.1007/978-1-4615-0443-6_3.

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Tantra, R., K. N. Robinson, D. Gohil, and J. C. Jarman. "Solubility Part 2: Colorimetry." In Nanomaterial Characterization. John Wiley & Sons, Inc, 2016. http://dx.doi.org/10.1002/9781118753460.ch6.

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Conference papers on the topic "Colorimetry"

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DeMarsh, LeRoy. "Color Appearance Problems in Motion Pictures and Television." In Color Appearance. Optica Publishing Group, 1987. http://dx.doi.org/10.1364/ca.1987.tuc2.

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In the context of motion picture and television applications, the term color appearance refers to how the picture looks, as opposed to it's measured or predicted physical characteristics. Most published studies of color reproduction problems concentrate on these physical factors. Indeed, many engineers seem to feel that color reproduction is a trivial problem-- just read a standard text on colorimetry and one has it all. Television is often cited as an example of one of the more successful applications of colorimetry. The author feels, that while application of colorimetric methods certainly played an important role in the development of television, the system works despite rather than because of "colorimetric theory".
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Schanda, J., K. Muray, and Balazs Kranicz. "LED colorimetry." In 9th Congress of the International Color Association, edited by Robert Chung and Allan Rodrigues. SPIE, 2002. http://dx.doi.org/10.1117/12.464616.

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Mignani, Anna G., Andrea A. Mencaglia, and Leonardo Ciaccheri. "Fiber optic systems for colorimetry and scattered colorimetry." In Congress on Optics and Optoelectronics, edited by Leszek R. Jaroszewicz, Brian Culshaw, and Anna G. Mignani. SPIE, 2005. http://dx.doi.org/10.1117/12.626097.

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Poulikakos, Lisa, Zaid Haddadin, Dev Shah, Loren Phillips, and Anna My Nguyen. "Nature-inspired 3D-architected colorimetric metasurfaces for polarization-tunable colorimetry." In Active Photonic Platforms (APP) 2023, edited by Ganapathi S. Subramania and Stavroula Foteinopoulou. SPIE, 2023. http://dx.doi.org/10.1117/12.2677913.

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Pustina, Teuta, Edit Xhajanka, and Mertia Barani. "Colorimetry in Dentistry." In University for Business and Technology International Conference. University for Business and Technology, 2018. http://dx.doi.org/10.33107/ubt-ic.2018.353.

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Vucane, Sanita, Martins Sabovics, Lauris Leitans, and Ingmars Cinkmanis. "Smartphone-based colorimetric determination of DPPH free radical scavenging activity in vegetable oils." In Research for Rural Development 2020. Latvia University of Life Sciences and Technologies, 2020. http://dx.doi.org/10.22616/rrd.26.2020.016.

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Free radicals can rapidly and irreversibly oxidize various structures, including unsaturated fatty acids in vegetable oils, which affect the sensory properties. Spectrophotometry is the most widely used method for the determination of free radical scavenging activity (RSA) using 2,2-diphenyl-1-picrylhydrazyl (DPPH). Barrier to the further use of classical analytical methods to analyze biologically active compounds in foodstuffs is that equipment requires high cost and has limited mobility. One of solutions is to replace classical methods, such as spectroscopy, with smartphonebased colorimetry. Huawei P30 Lite smartphone was used for colorimetric detection. The free radical scavenging activity (RSA) in vegetable oil was detected using an application ‘Color Picker’, with image matching algorithm for red, green, and blue (RGB) model. RSA was expressed as percentage and measured by the DPPH method. The aim of the study was to determinate the total free radical scavenging activity with smartphone-based colorimetry. For the data comparison and accuracy spectrophotometer as analytical optical instrument was used. Eleven vegetable oils: sea buckthorn, sunflower, rice, macadamia nut, hemp, corn, grape, linseed, rapeseed, olive and milk thistle oils were selected for analysis. The best results with no significant differences (p&gt;0.05) compared to smartphone-based colorimetry from spectrophotometry were determined using RG values. The poor results were detected by using B value (p&lt;0.05) and were not suitable for determination of RSA. Smartphone-based colorimetry can be used in the determination of the RSA in vegetable oils.
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Collewet, Christophe, and Eric Marchand. "Colorimetry-based visual servoing." In 2009 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2009). IEEE, 2009. http://dx.doi.org/10.1109/iros.2009.5354416.

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Muray, Kathleen. "Colorimetry with filtered detectors." In 14th Symposium of the TC2 on Photonic Measurements, edited by Janos Schanda and Tivadar Lippenyi. SPIE, 1993. http://dx.doi.org/10.1117/12.140161.

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Oleari, Claudio. "Colorimetry in optical coating." In Optical Systems Design 2005, edited by Claude Amra, Norbert Kaiser, and H. Angus Macleod. SPIE, 2005. http://dx.doi.org/10.1117/12.624782.

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Kotsikis, Panagiotis. "COLORIMETRY AT HIGH SCHOOL!" In 16th annual International Conference of Education, Research and Innovation. IATED, 2023. http://dx.doi.org/10.21125/iceri.2023.0698.

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Reports on the topic "Colorimetry"

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Carter, E. C., J. D. Schanda, R. Hirschler, et al. CIE 015:2018 Colorimetry, 4th Edition. International Commission on Illumination (CIE), 2018. http://dx.doi.org/10.25039/tr.015.2018.

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Valdes, James J., and James P. Chambers. A Colorimetric Esterase Assay. Defense Technical Information Center, 1990. http://dx.doi.org/10.21236/ada223403.

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Riddle, Catherine L., and Rick Demmer. Colorimetric Detection Method for Actinides (CoDeAc). Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1616584.

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Stringfellow, William, and Ji Lee. Method: Carbohydrate in Produced Water (Colorimetric). Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1676371.

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MCWHORTER, CHRISTOPHER. Colorimetric Method for Beryllium Surface Contamination Detection. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/822083.

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Hartmann, Kevin, William Buttner, Robert Burgess, and Carl Rivkin. Passive Leak Detection Using Commercial Hydrogen Colorimetric Indicator. Office of Scientific and Technical Information (OSTI), 2016. http://dx.doi.org/10.2172/1326889.

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Sandra L. Fox, Keith A. Daum, Carla J. Miller, and Marnie M. Cortez. Emergency First Responders' Experience with Colorimetric Detection Methods. Office of Scientific and Technical Information (OSTI), 2007. http://dx.doi.org/10.2172/920707.

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Baumann, E. Colorimetric determination of ferrous-ferric ratio in glass. Office of Scientific and Technical Information (OSTI), 1987. http://dx.doi.org/10.2172/7080410.

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Sitter, D., T. Spratlin, and K. Tobin. Algorithm for correcting data from imperfect tristimulus colorimeters. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/10116009.

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White, Brandy J., Martin H. Moore, Kaleb Franco, and Anthony P. Malanoski. Colorimetric Environmental Sensor: Aqueous Indicator Screening (Part I). Defense Technical Information Center, 2018. http://dx.doi.org/10.21236/ad1060523.

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