Analysis of low temperature trapping and recombination in II-VI compounds using photodielectric techniques

Using photodielectric effect to detect densities of free and trapped carriers in II-VI compounds at cryogenic temperature

Substituent effects on absorption spectra of pH indicators: an experimental and computational study of sulfonphthaleine dyes

Sulfonphthaleine dyes are an important class of pH indicators, finding applications in novel (textile) sensors. In this paper, we present a combined experimental and theoretical study to elucidate the halochromic behaviour of a large set of sulfonphthaleine compounds. Starting from an experimental analysis consisting of UV-Vis spectroscopy, the pH region and the absorption wavelengths related to the colour shift are obtained and pK(a) values are derived. The effect of the substituents on the pH region can be traced back to their electron donating/withdrawing properties. Time-Dependent Density Functional Theory (TD-DFT) is able to adequately produce the trend in experimental wavelengths. Proton affinities are used to assess the effect of substituents on the pH region. The combination of theory and experiment is able to give a better understanding of the pH sensitivity; the methodology in this work will be useful in future dye design and is applicable to other dye classes as well. (C) 2013 Elsevier Ltd. All rights reserved

Mars Spacecraft Power System Development Final Report

Development of optimum Mariner spacecraft power system for application to future flyby and orbiter mission

Enhanced Detection of Corrosion and Coating Aging Mechanisms Using Core-Shell Quantum Dots

Understanding aging mechanisms in coatings during their servicable life is complicated, due to the inherent stochastic nature of exposure profiles, service environments, and rare weather events. Thus, the development of improved test methods for service life prediction and accelerated weathering relies on the availability of infallible degradation and exposure data, delivered as a function of cumulative time in service. In a related application, non-destructive evaluative methods rely on the premise of being able to probe or monitor in situ mechanisms within a coating system without interfering with actual aging mechanisms. Ultimately, quantumdots can be utilized as in situ sensors for the detection, ongoing monitoring, and quantification of environmental exposure and degradation of coating systems exposed to humidity, moisture, electrolyte, and ultraviolet radiation cycles. Synthetic pathways for producing formulation-ready quantum dots are presented, along with preliminary results from controlled exposure and degradation studies. Current and ongoing work involves extending this technology to industrial non-destructive evaluation and coating health monitoring applications

The colour yellow and its immortal and mortal beauty

In this paper, another in a series of papers dealing with colour terms and their etymologies (greys, reds, blues and purples having been researched previously), the author focuses on yellows: the pigments/dyes used through history, their origins, manufacture and stories that have become inextricably linked to them; the associations that specific colours seem to evoke both on personal and collective levels (culturally and socially induced colour associations); yellow colour terms and their etymologies. The colour yellow has always held a great fascination for humans throughout history as well as serving to perpetuate various social memes, some of which are of particular significance to art history studies. The relevant etymologies and the stories they tell shed light on the history of yellow pigments and dyes, and the role they have played in our civilization, whilst providing an interesting example of a language - art history interface

Proposta para descrever a mistura de cores durante o processo de reintegração cromática

When writing the final report, conservators-restorers are often faced with a lot of indecision on how to describe the colour mixing used in retouching process. The reports may sound somewhat incomplete, especially if the technical data is completely left out. The recorded information are usually restricted to the type of paint with indication of the brand and the type of binder and pigments used. Thus, the aim of this paper is to propose a measurable system that could help the students and the professionals to describe the use of colour mixtures during the chromatic reintegration treatment.Al escribir el informe final, los conservadores-restauradores pueden estar indecisos sobre cómo describir la mezcla de colores utilizada en el proceso de reintegración cromática. Los informes pueden parecer un poco incompletos, especialmente si faltan los datos técnicos. La información registrada generalmente está restringida al tipo de pintura con indicación de la marca y el tipo de aglutinante y pigmentos utilizados. Por lo tanto, el objetivo de este artículo es proponer un sistema medible que pueda ayudar a los estudiantes y profesionales de conservación y restauración a describir el uso de mezclas de colores durante el tratamiento de la reintegración cromática.Ao escrever o relatório final, os conservadores-restauradores podem ficar indecisos sobre como descrever a mistura de cores usada no processo de reintegração cromática. Os relatórios podem parecer um pouco incompletos, especialmente se os dados técnicos estiverem em falta. As informações registradas são geralmente restritas ao tipo de tinta com indicação da marca e do tipo de aglutinante e pigmentos utilizados. Assim, o objetivo deste artigo é propor um sistema mensurável que possa ajudar os estudantes e os profissionais de conservação e restauro a descrever o uso de misturas de cores durante o tratamento de reintegração cromática.info:eu-repo/semantics/publishedVersio