KDP crystals modified with organic molecules: luminophore embedding criteration

Experimental study results on the conditions of KDP single crystal growing doped by organic luminophors have been presented. A possible coherent conjugation scheme for crystal-chemical parameters of KDP lattice with some organic luminophors has been shown. Basing on quantum-chemical calculations of luminophore average molecular radii, consideration of their dissociated ion charges as well as on experimental results of the molecules entering into crystals, the coherent criterion of the built-in molecule conjuga-tion (CCC) with the lattice points has been proposed. That approach can be proposed for modifying various water-soluble crystals with organic luminophores.Представлено результати експеримен- тальних досліджень умов вирощування монокристалів KДП, легованих органічними люмінофорами. Подано схему можливого когерентного спряження кристало-хімічних параметрів гратки KДП з деякими органічними люмінофорами. На підставі квантово-хімічних розрахунків середнього радіусу молекул люмінофорів, аналізу величин зарядів їx дисоційованих йонів, а також експериментальних результатів щодо входження молекул у кристали запропоновано критерій когерентного спряження (ККС) молекули, яка входить у вузли гратки. Даний підхід може бути запропонований для модифікування органічними люмінофорами різних водорозчинних кристалів.Представлены результаты экспериментальных исследований условий выращивания монокристаллов KДП, легированных органическими люминофорами. Показана схема возможного когерентного сопряжения кристаллохимических параметров решетки KДП с некоторыми органическими люминофорами. На основе квантово-химических расчетов усредненного радиуса молекул люминофоров, анализа величин зарядов их диссоциированных ионов, а также экспериментальных результатов по вхождению молекул в кристаллы предложен критерий когерентного сопряжения встраиваемой молекулы с узлами решетки. Данный подход может быть предложен для модифицирования органическими люминофорами различных водорастворимых кристаллов

Interaction of Low - Energy Induced Gravity with Quantized Matter and Phase Transition Induced by Curvature

At high energy scale the only quantum effect of any asymptotic free and asymptotically conformal invariant GUT is the trace anomaly of the energy-momentum tensor. Anomaly generates the new degree of freedom, that is propagating conformal factor. At lower energies conformal factor starts to interact with scalar field because of the violation of conformal invariance. We estimate the effect of such an interaction and find the running of the nonminimal coupling from conformal value $\frac{1}{6}$ to $0$. Then we discuss the possibility of the first order phase transition induced by curvature in a region close to the stable fixed point and calculate the induced values of Newtonian and cosmological constants.Comment: 11 pages, LaTex, KEK-TH-397-KEK Preprint 94-3

Many heads but one brain: FusionBrain – a single multimodal multitask architecture and a competition

Supporting the current trend in the AI community, we present the AI Journey 2021 Challenge called FusionBrain, the first competition which is targeted to make a universal architecture which could process different modalities (in this case, images, texts, and code) and solve multiple tasks for vision and language. The FusionBrain Challenge combines the following specific tasks: Code2code Translation, Handwritten Text recognition, Zero-shot Object Detection, and Visual Question Answering. We have created datasets for each task to test the participants’ submissions on it. Moreover, we have collected and made publicly available a new handwritten dataset in both English and Russian, which consists of 94,128 pairs of images and texts. We also propose a multimodal and multitask architecture – a baseline solution, in the centre of which is a frozen foundation model and which has been trained in Fusion mode along with Single-task mode. The proposed Fusion approach proves to be competitive and more energy-efficient compared to the task-specific one.We would like to thank Sber and SberCloud for granting the GPU-resources to us to experiment with different architectures and also to the participants to train their models, and for supporting the FusionBrain Challenge in general

GUTs in Curved Spacetime: Running Gravitational Constants, Newtonian Potential and the Quantum Corrected Gravitational Equations

The running coupling constants (in particular, the gravitational one) are studied in asymptotically free GUTs and in finite GUTs in curved spacetime, with explicit examples. The running gravitational coupling is used to calculate the leading quantum GUT corrections to the Newtonian potential, which turn out to be of logarithmic form in asymptotically free GUTs. A comparison with the effective theory for the conformal factor ---where leading quantum corrections to the Newtonian potential are again logarithmic--- is made. A totally asymptotically free $O(N)$ GUT with quantum higher derivative gravity is then constructed, using the technique of introducing renormalization group (RG) potentials in the space of couplings. RG equations for the cosmological and gravitational couplings in this theory are derived, and solved numerically, showing the influence of higher-derivative quantum gravity on the Newtonian potential. The RG-improved effective gravitational Lagrangian for asymptotically free massive GUTs is calculated in the strong (almost constant) curvature regime, and the non-singular De Sitter solution to the quantum corrected gravitational equations is subsequently discussed. Finally, possible extensions of the results here obtained are briefly outlined.Comment: LaTeX, 27 pages, 2 uu-figure

Growth peculiarities of doped lithium dihydrogen phosphate single crystals from nonstoichiometric solution

Single crystals of lithium dihydrogen phosphate (LDP) have been grown on a seed by pulling-out from aqueous viscous solutions with an excess of orthophosphoric acid. The effect of solution stoichiometry on the habit and morphology of the faces of LDP single crystals is investigated. It is established that the habit of the crystals changes with the rise of concentration of the acid in the solution. Shown is the effect of dopants of thallium ions, molecules of salicylic and 5-aminosalicylic acid on the morphology of the crystal faces, which manifests itself in a diminution of the width of the terraces and an increase of the density of the growth steps. Proposed is a model of arrangement of the dopant molecules in the interplanar space of LDP crystal lattice

Down-conversion luminescence of Yb³⁺ in novel Ba<inf>4</inf>Y<inf>3</inf>F<inf>17</inf>:Yb:Ce solid solution by excitation of Ce³⁺ in UV spectral range

© 2020 Elsevier B.V. The down-conversion luminescence under UV excitation was demonstrated in single-phase Ba4Y3F17 solid solution nanoparticles codoped with Ce3+/Yb3+. The complex photodynamic processes occurred in the samples including excited state absorption, excitons and color centers formation. The Yb doping suppressed the solarization effect. The efficiency of down-conversion from UV to near IR luminescence of Yb3+ appeared to be high due to Ce4+-Yb2+ charge transfer mechanism responsible for energy transfer between Ce3+ and Yb3+ ions. The direct measurements of down-conversion luminescence quantum yield by means of integrating sphere and calculations of energy transfer efficiency from luminescence spectra data were carried out. The down-conversion luminescence quantum yield reached the maximum value of about 1% for the sample with 0,1 mol.% of Ce3+ and 5,0 mol.% of Yb3+ ions contents, whereas energy transfer coefficient reached its maximum of about 6,3% for 0,05 mol.% of Ce3+ and 5,0 mol.% of Yb3+ ions