DSpace at the Univeristy of Latvia: Recent submissions
Now showing items 101-120 of 62614
-
Synthesis and Investigation of ReSe2 Thin Films Obtained from Magnetron Sputtered Re and ReOx
(MDPI, 2024)The promise of two-dimensional (2D) rhenium diselenide (ReSe2) in electronics and optoelectronics has sparked considerable interest in this material. However, achieving the growth of high-quality ReSe2 thin films on a wafer ... -
Researchers of Ukrainian universities in wartime conditions: Needs, challenges and opportunities
(Elsevier B.V., 2024)Against the backdrop of the ongoing war conflict between Russia and Ukraine, the article explores the needs, challenges, and opportunities that researchers affiliated with Ukrainian relocated university experienced. In the ... -
Modeling of Induction Motor Direct Starting with and without Considering Current Displacement in Slot
(MDPI, 2024)This article presents a mathematical model of three-phase induction motor (IM) with a squirrel cage rotor and investigates its starting modes. Specifically, two scenarios are considered: direct starting of an IM and direct ... -
Matrix-dependent high-contrast photochromism in Eu-doped M3MgSi2O8 (M = Ca, Sr, Ba)
(Royal Society of Chemistry, 2024)The photochromic properties and charge transfer processes were studied in novel Eu-doped M3MgSi2O8 (M = Ca, Sr, Ba) compounds. These materials exhibit vivid color changes upon irradiation with UV light, resulting in orange, ... -
Lossy mode resonance in photonic integrated circuits
(Elsevier Ltd, 2024)In recent years, the promising phenomenon known as lossy mode resonance (LMR) has garnered significant attention in sensing applications. While existing literature in the field of LMR focuses on optical fiber systems and ... -
Hyperfine interactions of paramagnetic radiation-induced defect centres in advanced ceramic breeder pebbles
(Elsevier Ltd, 2024)Advanced ceramic breeder (ACB) pebbles consisting of 65 mol% lithium orthosilicate (Li4SiO4) and 35 mol% lithium metatitanate (Li2TiO3) are developed for tritium breeding in the European Union's (EU) helium cooled pebble ... -
First-Principles Linear Combination of Atomic Orbitals Calculations of K2SiF6 Crystal: Structural, Electronic, Elastic, Vibrational and Dielectric Properties
(MDPI, 2024)The results of first-principles calculations of the structural, electronic, elastic, vibrational, dielectric and optical properties, as well as the Raman and infrared (IR) spectra, of potassium hexafluorosilicate (K2SiF6; ... -
Experimental and Theoretical Comparison and Analysis of Surface-Enhanced Raman Scattering Substrates with Different Morphologies
(MDPI, 2024)The following research paper concerns the analysis and characterisation of commercially available surface-enhanced Raman scattering (SERS) substrates. SERS has long been a potentially very powerful method with a great deal ... -
Efficient Decoupled Electrolytic Water Splitting in Acid through Pseudocapacitive TiO2
(John Wiley and Sons Inc, 2024)Water electrolysis remains a key component in the societal transition to green energy. Membrane electrolyzers are the state-of-the-art technology for water electrolysis, relying on 80 °C operation in highly alkaline ... -
The Effect of Molecular Structure on the Properties of Fluorene Derivatives for OLED Applications
(MDPI, 2024)A new family of symmetrical fluorene derivatives with different types of substituents attached to the C-2 and C-7 positions of the fluorene core synthesized by the Sonogashira coupling reactions is reported. The electronic ... -
Effect of Ceria Doping on the Mechanical Properties and Phase Stability of Partially Samaria-Stabilized Zirconia Crystals
(MDPI, 2024)The effect of ceria doping of (ZrO2)1−x(Sm2O3)x crystals on their phase composition, microhardness and fracture toughness was studied. The (ZrO2)0.995−x(Sm2O3)x(CeO2)0.005 crystals (where x = 0.032, 0.037 and 0.04) were ... -
Diabetic Retinopathy Features Segmentation without Coding Experience with Computer Vision Models YOLOv8 and YOLOv9
(MDPI, 2024)Computer vision is a powerful tool in medical image analysis, supporting the early detection and classification of eye diseases. Diabetic retinopathy (DR), a severe eye disease secondary to diabetes, accompanies several ... -
Comparative VUV Synchrotron Excitation Study of YAG: Eu and YAG: Cr Ceramics
(MDPI, 2024)Using synchrotron radiation, a comparative VUV excitation study of YAG ceramics doped with Eu3+ and Cr3+ ions under VUV excitation (10.5–3.7 eV) at 9 K was conducted in this work. Both ceramics exhibit distinct excitation ... -
Colour Vision Changes across Lifespan: Insights from FM100 and CAD Tests
(MDPI, 2024)(1) Background: in this research study, colour vision was evaluated in individuals aged 19 to 70 years with and without red–green colour vision disorders. (2) Methods: study participant colour vision was assessed with ... -
Annealing Effect on Structural, Optical and Electrophysical Properties of ZnSe Nanocrystals Synthesized into SiO2/Si Ion Track Template
(MDPI, 2024)We report the results of synthesis of zinc selenide (ZnSe) nanocrystals into SiO2/Si track templates formed by irradiation with 200 MeV Xe ions up to a fluence of 107 ions/cm2. Zinc selenide nanocrystals were obtained by ... -
The Development and Atomic Structure of Zinc Oxide Crystals Grown within Polymers from Vapor Phase Precursors
(American Chemical Society, 2024)Sequential infiltration synthesis (SIS), also known as vapor phase infiltration (VPI), is a quickly expanding technique that allows growth of inorganic materials within polymers from vapor phase precursors. With an increasing ... -
Wet Chemical Synthesis of AlxGa1−xAs Nanostructures: Investigation of Properties and Growth Mechanisms
(MDPI, 2024)This study focuses on the wet chemical synthesis of AlxGa1−xAs nanostructures, highlighting how different deposition conditions affect the film morphology and material properties. Electrochemical etching was used to texture ... -
A Visual Representation for Accurate Local Basis Set Construction and Optimization: A Case Study of SrTiO3 with Hybrid DFT Functionals
(MDPI, 2024)The linear combination of atomic orbitals (LCAO) method is advantageous for calculating important bulk and surface properties of crystals and defects in/on them. Compared to plane wave calculations and contrary to common ... -
Color Centers in BaFBr Crystals: Experimental Study and Theoretical Modeling
(MDPI, 2024)This study presents theoretical and experimental investigations into the electron and hole color centers in BaFBr crystals, characterizing their electronic and optical properties. Stoichiometric BaFBr crystals grown by the ... -
Dopant-free fluorene based dimers linked with thiophene units as prospective hole transport materials for Sb2S3 solar cells
(Royal Society of Chemistry, 2024)Novel dopant-free dimers comprising methoxydiphenylamine substituted fluorene derivatives and connected by central cores consisting of different numbers of thiophene moieties were synthesized and explored as hole transport ...