Browsing B6 – LU institūti un aģentūras / Institutes and agencies of the UL by Title
Now showing items 684-703 of 1027
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Perovskite CH3NH3PbI3–XClx Solar Cells and their Degradation (Part 1: A Short Review)
(De Gruyter, 2021)Development of hybrid organic-inorganic perovskite solar cells (PSC) has been one of the hottest research topics since 2013. Within brief literature review, we would like to achieve two objectives. Firstly, we ... -
Perovskite CH3NH3PbI3–XClx Solar Cells. Experimental Study of Initial Degradation Kinetics and Fill Factor Spectral Dependence
(De Gruyter, 2021)The main drawback of the methylammonium lead halide perovskite solar cells is their degradation in ambient atmosphere. To investigate ambient-air-induced cell degradation, spec-tral dependencies of open-circuit ... -
The persistent presence of the dead: recent excavations at the hunter-gatherer cemetery at Zvejnieki
(Antiquity Publications Ltd., 2013) -
Personiskā, lokālā, globālā un glokālā aktualizācija Latvijas komerciālo nosaukumu ainavā
(Latvijas Universitātes Latviešu valodas institūts, 2020)Šim rakstam ir divi savstarpēji saistīti mērķi: teorētiskais un praktiskais. Teorētiskais mērķis ir skaidrot galvenos pētījuma terminus (globalizācija, lokalizācija un glokalizācija) no valodniecības perspektīvas un iztirzāt ... -
Phase stability and oxygen-sensitive photoluminescence of ZrO2:Eu,Nb nanopowders
(Elsevier B.V., 2018)We studied structure and oxygen-sensitive photoluminescence (PL) of ZrO2:Eu,Nb nanocrystalline powders synthesized via a sol-gel route and heat-treated up to 1200 °C. The material containing only 2 at% Eu3+ was predominantly ... -
Phase transitions and upconversion luminescence in oxyfluoride glass ceramics containing Ba4Gd3F17 nanocrystals
(Elsevier B.V., 2017)Novel transparent Er3+ doped oxyfluoride glass-ceramics containing Ba4Gd3F17 nanocrystals were prepared by melt quenching followed by heat treatment of as-prepared glasses. The phase composition and microstructure were ... -
Phänomen und Wirklichkeit des Ich
(LU Filozofijas un socioloģijas institūts, 2012)Viele Manuskripte über die Phänomenologie von Edmund Husserls Schülern sind immer noch nicht publiziert. Das Manuskript von Theodor Celms – nach dem Tod des Autors erworben vom Institut für Philosophie und Soziologie der ... -
Philosophical Theology and the Linguistic Turn
(LU Filozofijas un socioloģijas institūts, 2014) -
Photocatalytic Activity of TiO2 Coatings Obtained at Room Temperature on a Polymethyl Methacrylate Substrate
(MDPI, 2022)Titanium dioxide (TiO2) coatings have a wide range of applications. Anatase exhibits hydrophilic, antimicrobial, and photocatalytic properties for the degradation of organic pollutants or water splitting. The main challenge ... -
Photoconductivity & photoelectron emission of LiGaO2 crystal excited in intrinsic absorption range
(Elsevier B.V., 2019)The photoelectric response spectra were studied in a LiGaO2 crystal. The obtained spectra were interpreted as the release and diffusion of charge carriers, as well as external photoemission of electrons. The charge carrier ... -
Photoelectric fields in doped lithium niobate crystals
(Taylor & Francis, 2019)Photoinduced light scattering (PILS) in nominally pure stoichiometric and congruent lithium niobate single crystals (LiNbO3), and ones doped with B³⁺, Cu²⁺, Zn²⁺, Mg²⁺, Gd³⁺, Y³⁺, Er³⁺ cations was studied. All crystals ... -
Photoelectric response of localized states in silica glass
(Elsevier B.V., 2019)The photoelectric response of pure silica glasses excited by excimer lasers has been studied. The samples were made under various conditions. Photoelectric polarization of samples due to the Dember effect has been registered. ... -
Photoluminescence and Electron Spin Resonance of ilicon Dioxide Crystal with Rutile Structure (Stishovite)
(Wiley-VCH GmbH, 2018)An electron spin resonance (ESR) and photoluminescence signal is observed in the as grown single crystal of stishovite indicating the presence of defects in the non‐irradiated sample. The photoluminescence of the as received ... -
Photophysical and Electrical Properties of Highly Luminescent 2/6-Triazolyl-Substituted Push-Pull Purines
(American Chemical Society, 2022)New push-pull N(9)-alkylated 6-piperidino-2-triazolylpurine and 2-piperidino-6-triazolylpurine derivatives are synthesized, and their optical and optoelectronic properties are comprehensively characterized with experimental ... -
Photoplethysmography for bovine heat detection: the preliminary results
(International Society for Optics and Photonics (SPIE), 2020-02-14)In this study, we applied photoplethysmography (PPG) as an alternative, convenient, and affordable method for bovine heat detection. Heat detection is an essential part of effective herd reproduction management. Currently, ... -
Photoplethysmography in dogs and cats: a selection of alternative measurement sites for a pet monitor
(IOP Publishing, 2019-01-22)Objective: Photoplethysmography (PPG) is an increasingly popular health and well-being tool for monitoring heart rate and oxygen saturation. Due to the pigmentation and hairiness of dogs and cats, a pulse oximeter is ... -
Photovoltaic effect in bulk heterojunction system with glass forming indandione derivative DMABI-6Ph
(Elsevier Ltd, 2018)The aim of the work is to evaluate possible use of 2-[[4-(bis(2-trityloxyethyl)amino)phenyl]methylene]indane-1,3-dione (DMABI-6Ph) as light absorbing material for solar cells. DMABI-6Ph is a perspective material due to its ... -
Piederēt un atšķirties: romu, krievu un latviešu dzīvesstāsti Latvijā
(LU Filozofijas un socioloģijas institūts; Latvijas Mutvārdu vēstures pētnieku asociācija “Dzīvesstāsts”, 2017)Latvijas Universitātes Filozofijas un socioloģijas institūta dzīvesstāstu pētnieku grupas kolektīvā monogrāfija “Piederēt un atšķirties: romu, krievu un latviešu dzīvesstāsti Latvijā” noslēdz Latvijas Zinātnes padomes ...