Relation between crystal structure and optical properties in the correlated blue pigment YIn$_{1-x}$Mn$_x$O$_3$ [PDF]
, 2022 A material's properties and functionalities are determined by its chemical constituents and the atomic arrangement in which they crystallize. For the recently discovered pigment YIn$_{1-x}$Mn$_x$O$_3$, for instance, it had been surmised that its bright blue color owes to an unusual, trigonal bipyramidal, oxygen coordination of the manganese impurities.
arxiv +1 more source
Association of indigo with zeolites for improved colour stabilization [PDF]
Applied Spectroscopy 64, 10 (2010) 1131-1138, 2012 The durability of an organic colour and its resistance against external chemical agents and exposure to light can be significantly enhanced by hybridizing the natural dye with a mineral. In search for stable natural pigments, the present work focuses on the association of indigo blue with several zeolitic matrices (LTA zeolite, mordenite, MFI zeolite).
arxiv +1 more source
A new channel for excitonic transport in the FMO complex [PDF]
arXiv, 2021 We expose a new excitation transport channel in FMO, consisting of the 7 intramonomeric pigments and their 2nd nearest intermonomeric counterpart. Such a channel outcompetes the standard alternative, where intramonomeric pigments partner with their closest intermonomeric pigment.
arxiv
Interpolated inverse discrete wavelet transforms in additive and non-additive spectral background correction [PDF]
arXiv, 2023 We demonstrate the applicability of using interpolated inverse discrete wavelet transforms as a general tool for modeling additive or multiplicative background or error signals in spectra. Additionally, we propose an unsupervised way of estimating the optimal wavelet basis along with the model parameters.
arxiv
ganX -- generate artificially new XRF a python library to generate MA-XRF raw data out of RGB images [PDF]
arXiv, 2023 In this paper we present the first version of ganX -- generate artificially new XRF, a Python library to generate X-ray fluorescence Macro maps (MA-XRF) from a coloured RGB image. To do that, a Monte Carlo method is used, where each MA-XRF pixel signal is sampled out of an XRF signal probability function.
arxiv
Rare-Earth vs. Heavy Metal Pigments and their Colors from First Principles [PDF]
Proc. Natl. Acad. Sci. USA 110 (3) 904-907 (2013), 2013 Many inorganic pigments contain heavy metals hazardous to health and environment. Much attention has been devoted to the quest for non-toxic alternatives based on rare-earth elements. The computation of colors from first principles is a challenge to electronic structure methods however, especially for materials with localized f-orbitals. Here, starting
arxiv +1 more source
Noninvasive identification of carbon-based black pigments with pump-probe microscopy [PDF]
Carbon-based black pigments, a widely used class of pigments, are difficult to differentiate with the noninvasive techniques currently used in cultural heritage science. We utilize pump-probe microscopy to distinguish four common carbon-based black pigments as pure pigments, as two-component black pigment mixtures, and as a mixture of a black and a ...
arxiv +1 more source
Prediction Model for Semitransparent Watercolor Pigment Mixtures Using Deep Learning with a Dataset of Transmittance and Reflectance [PDF]
arXiv, 2019 Learning color mixing is difficult for novice painters. In order to support novice painters in learning color mixing, we propose a prediction model for semitransparent pigment mixtures and use its prediction results to create a Smart Palette system. Such a system is constructed by first building a watercolor dataset with two types of color mixing data,
arxiv
Full quantum dynamics of the electronic coupling between photosynthetic pigments [PDF]
arXiv, 2015 From studying the time evolution of the single electron density matrix within a density functional tight-binding formalism we study in a fully atomistic picture the electronic excitation transfer between two photosynthetic pigments in real time. This time-dependent quantum dynamics is based on fully atomistic structural models of the photosynthetic ...
arxiv
An investigation into the energy transfer efficiency of a two-pigment photosynthetic system using a macroscopic quantum model [PDF]
arXiv, 2020 Despite several different measures of efficiency that are applicable to the photosynthetic systems, a precise degree of efficiency of these systems is not completely determined. Introducing an efficient model for the dynamics of light-harvesting complexes in biological environments is a major purpose in investigating such systems.
arxiv