Now showing items 350-369 of 1020

    • Hardening of Steel Perforated Tape by Nd:YAG Laser 

      Mironovs, Viktors; Lisicins, Mihails; Onufrijevs, Pavels; Muktepavela, Faina; Medvids, Arturs (Trans Tech Publications Ltd., 2017)
      One of the directions of application of the perforated metal material is their use as cutting elements in the production of processing tools. In this case it is necessary to carry out hardening of cutting surfaces to ...
    • Hardness and modulus of elasticity of atomic layer deposited Al2O3-ZrO2 nanolaminates and mixtures 

      Jõgiaas, Taivo; Zabels, Roberts; Tarre, Aivar; Tamm, Aile (Elsevier B.V., 2020)
      Atomic layer deposition was used to produce 90–105 nm thick alumina-zirconia mixtures and nanolaminate structures on soda-lime glass substrate. The resultant chemical and structural compositions of the thin films were ...
    • Heat capacity and thermal conductivity of multiferroics Bi1-xPrxFeO3 

      Kallaev, S. N.; Omarov, Zairbek M.; Mitarov, R. G.; Sadykov, S. A.; Khasbulatov, Sidek V.; Reznichenko, Larisa A.; Bormanis, Karlis Ya; Kundzinsh, Maris (Taylor and Francis Ltd., 2019)
      The heat capacity and thermal conductivity of multiferroics Bi1–xPrxFeO3 (0 ≤ x ≤ 0.50) has been studied in the temperature range of 130–800 K. A slight substitution of praseodymium for bismuth is found to lead to a ...
    • Heritage-making: Written Texts in the Transmission of Traditional Knowledge of Natural Dyeing 

      Karlsone, Anete (The Museum of the Romanian Peasant Anthropology, 2022)
      Natural dyeing is an element of intangible cultural heritage which is gaining new relevance today. Heritage-making as a set of purposeful activities has become an object of interest for researchers relatively recently, ...
    • High Entropy Alloys for Energy Conversion and Storage: A Review of Grain Boundary Wetting Phenomena 

      Straumal, Boris; Korneva, Anna; Kuzmin, Alexei; Klinger, Leonid; Lopez, Gabriel A.; Vershinin, Nikolai; Straumal, Alexander; Gornakova, Alena (MDPI, 2022)
      The multicomponent alloys with nearly equal concentration of components, also known as high entropy alloys (HEAs), were first proposed 22 years ago. The HEAs quickly became very important in materials science due to their ...
    • High Performance Triboelectric Nanogenerators from Compostable Cellulose-Biodegradable Poly(Butylene Succinate) Composites 

      Lapčinskis, Linards; Ģērmane, Līva; Platnieks, Oskars; Krikovs, Artis; Pudzs, Kaspars; Linarts, Artis; Sherrell, Peter C.; Šutka, Andris (Wiley, 2023)
      Triboelectric nanogenerator (TENG) devices are exemplar systems for mechanical-to-electrical energy conversion due to their simplicity and promising performance. However, little attention has been paid to recycling or ...
    • High power impulse magnetron sputtering of Zn/Al target in an Ar and Ar/O2 atmosphere: The study of sputtering process and AZO films 

      Zubkins, Martins; Arslan, H.; Bikse, Liga; Purans, Juris (Elsevier B.V., 2019)
      Reactive high power impulse magnetron sputtering (R-HiPIMS) has been demonstrated as a promising technique for the ZnO:Al (AZO) thin film deposition at low temperature with improved electrical properties compared to the ...
    • High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles 

      Gavrilović, Tamara; Laganovska, Katrīna; Zolotarjovs, Aleksejs; Smits, Krisjanis; Jovanović, Dragana J.; Dramićanin, Miroslav D. (Elsevier B.V., 2018)
      Nanoparticles (5 nm) and nanorods (2 nm × 15 nm and 4 nm × 20 nm) of monoclinic monazite LaPO4:Eu3+ were prepared by reverse micelle and co-precipitation techniques. Effects of the particle size and surface defects on the ...
    • High-order harmonics generation in Cd and Pd laser-induced plasmas 

      Ganeev, Rashid A.; Kim, Vyacheslav V.; Butikova, Jelena; Atvars, Aigars; Grube, Jurgis; Sarakovskis, Anatolijs; Ubelis, Arnolds (Optica Publishing Group, 2023)
      We demonstrate the generation of high-order harmonics of laser pulses in palladium and cadmium plasmas. We adjusted the wavelength of driving pulses to investigate the resonance enhancement in different ranges of extreme ...
    • High-pressure synthesis of boron-rich chalcogenides B12S and B12Se 

      Cherednichenko, Kirill A.; Mukhanov, Vladimir A.; Kalinko, Aleksandr; Solozhenko, Vladimir L. (Elsevier, 2022)
      Two boron-rich chalcogenides B12S and B12Se isostructural to α-rhombohedral boron were synthesized by chemical reaction of the elements at high-pressure – high-temperature conditions. The crystal structures and stoichiometries ...
    • High-Quality Si-Doped β-Ga2O3 Films on Sapphire Fabricated by Pulsed Laser Deposition 

      Khartsev, Sergey I.; Nordell, Nils; Hammar, Mattias; Purans, Juris; Hállen, Anderson (Wiley-VCH Verlag, 2020)
      Pulsed laser ablation is used to form high-quality silicon-doped β-Ga2O3 films on sapphire by alternatively depositing Ga2O3 and Si from two separate sources. X-ray analysis reveals a single crystallinity with a full width ...
    • High-temperature X-ray absorption spectroscopy study of thermochromic copper molybdate 

      Jonane, Inga; Anspoks, Andris; Aquilanti, Giuliana; Kuzmin, Alexei (Acta Materialia Inc, 2019)
      X-ray absorption spectroscopy at the Cu and Mo K-edges was used to study the effect of heating on the local atomic structure and dynamics in copper molybdate (α-CuMoO4) in the temperature range from 296 to 973 K. The reverse ...
    • Homme 

      Timuška, Agris (Editura Universităţii din Bucureşti, 2014)
    • How to draw combinatorial maps? 

      Zeps, Dainis; Ķikusts, Paulis (2013-01-31)
      In this article we consider the combinatorial map (rendered by permutations) approach to graphs on surfaces and how between both could be establish some terminological uniformity in favor of combinatorial maps in the way ...
    • Human Soul, Body and Life Horizons 

      Kūle, Maija (Springer, 2014)
    • Hybrid density functional calculations of hyperfine coupling tensor for hole-type defects in MgAl2O4 

      Platonenko, Alexander; Gryaznov, Denis; Kotomin, Eugene A.; Lushchik, Aleksandr; Seeman, Viktor; Popov, Anatoli I. (Elsevier B.V., 2020)
      We have performed the density functional calculations (DFT) on the hole-type defects (V-centres) in magnesium aluminate spinel (MgAl2O4) following the results of recent paramagnetic resonance measurements (EPR) in Nucl. ...
    • Hybrid Tribo-Piezo-Electric Nanogenerator with Unprecedented Performance Based on Ferroelectric Composite Contacting Layers 

      Lapčinskis, Linards; Mālnieks, Kaspars; Linarts, Artis; Blūms, Juris; Šmits, Krišjānis; Järvekülg, Martin; Knite, Māris; Šutka, Andris (American Chemical Society, 2019)
      It was recently reported that more efficient triboelectric nanogenerator (TENG)-like devices can be prepared using inversely polarized ferroelectric films made of same material as the contacting layers. In the present work, ...
    • Hydrogen from industrial aluminium scraps: Hydrolysis under various conditions, modelling of pH behaviour and analysis of reaction by-product 

      Urbonavicius, Marius; Varnagiris, Sarunas; Mezulis, Ansis; Lesnicenoks, Peteris; Knoks, Ainars; Richter, Christiaan; Milcius, Darius; Meirbekova, Rauan; Gunnarsson, Gudmundur; Kleperis, Janis (Elsevier, 2023)
      The study explores the feasibility of utilizing aluminium scrap waste from the construction industry for hydrogen production via hydrolysis. Specifically, the study involves a primary analysis of aluminium scrap waste and ...
    • Hydrothermal Synthesis and Properties of Yb3+/Tm3+ Doped Sr2LaF7 Upconversion Nanoparticles 

      Milićević, Bojana; Periša, Jovana; Ristić, Zoran; Milenković, Katarina; Antić, Željka; Smits, Krisjanis; Kemere, Meldra; Vitols, Kaspars; Sarakovskis, Anatolijs; Dramićanin, Miroslav D. (MDPI, 2023)
      We report the procedure for hydrothermal synthesis of ultrasmall Yb3+/Tm3+ co-doped Sr2LaF7 (SLF) upconversion phosphors. These phosphors were synthesized by varying the concentrations of Yb3+ (x = 10, 15, 20, and 25 mol%) ...
    • Idejas un ieteikumi uzņēmuma nosaukšanai 

      Berra, Solvita (LU Latviešu valodas institūts, 2021)
      Bukletā ir sniegts pārskats par uzņēmumu nosaukumu veidiem (tieši, simboliskie un jauktie nosaukumi; triviāli un netriviāli nosaukumi, lokāli, globāli un glokāli nosaukumi) un lingvistiskās izveides stratēģijām un līdzekļiem ...