Browsing B6 – LU institūti un aģentūras / Institutes and agencies of the UL by Title

Now showing items 120-139 of 1020

    • Certain doping concentrations caused half-metallic graphene 

      Miao, Lu; Jia, Ran; Wang, Yu; Kong, Chui-Peng; Wang, Jian; Eglitis, Roberts I.; Zhang, Hong-Xing (Elsevier B.V., 2017)
      The singly B and N doped graphene systems are carefully studied. The highly concentrated dopants cause a spin polarization effect in the systems. The spin polarization limits are affirmed in the singly B and N doped graphene ...

    • Challenges in automated estimation of capillary refill time in dogs 

      Cugmas, Blaž; Spīgulis, Jānis (SPIE, 2018-02-20)
      Capillary refill time (CRT) is a part of the cardiorespiratory examination in dogs. Changes in CRT can reflect pathological conditions like shock or anemia. Visual CRT estimation has low repeatability; therefore, optical ...

    • Changes in freshwater sediment microbial populations during fermentation of crude glycerol 

      Paiders, Matiss; Nikolajeva, Vizma; Makarenkova, Galina; Orola, Liana; Dimanta, Ilze; Kleperis, Janis (Pontificia Universidad Catolica de Valparaiso, 2021)
      Background: This work studied how the exposure to an unusual substrate forced a change in microbial populations during anaerobic fermentation of crude glycerol, a by-product of biodiesel production, with freshwater sediment ...

    • Changes in structure and conduction type upon addition of Ir to ZnO thin films 

      Zubkins, Martins; Kalendarev, Robert; Gabrusenoks, Jevgenijs; Plaude, A. V.; Zitolo, Andrea; Anspoks, Andris; Pudzs, Kaspars; Vilnis, Kaspars; Azens, Andris; Purans, Juris (Elsevier B.V., 2017)
      Zn-Ir-O (Zn/Ir ≈ 1/1) thin films have been reported to be a potential p-type TCO material. It is, however, unknown whether it is possible to achieve p-type conductivity at low Ir content, and how the type and the magnitude ...

    • Chapter 8: EPR in glass ceramics 

      Antuzevics, Andris (Elsevier B.V., 2019)
      The development of novel materials requires a profound understanding of the relationship between a material's performance and its structural properties. Electron paramagnetic resonance (EPR) is a well-established technique ...

    • Characterization of CdxTeyOz/CdS/ZnO Heterostructures Synthesized by the SILAR Method 

      Suchikova, Yana; Kovachov, Sergii; Bohdanov, Ihor; Popova, Elena; Moskina, Aleksandra; Popov, Anatoli (MDPI, 2023)
      CdxTeyOz/CdS/ZnO heterostructures were obtained by the SILAR method using ionic electrolytes. A CdS film was formed as a buffer layer for better adhesion of the cadmium-tellurium oxides to the substrate surface. In turn, ...

    • Characterization of crystalline structure and morphology of Ga2O3 thin film grown by MOCVD technique 

      Kjapsna, Alvars; Dimitrocenko, Lauris; Tale, Ivars; Trukhin, Anatoly; Ignatans, Reinis; Grants, Rolands (Trans Tech Publications Ltd., 2017)
      Growth of gallium oxide thin film was realized with MOCVD on (0001) sapphire substrate. Structural and compositional properties of thin film were studied employing trimethylgallium and water as precursors, carrier gases ...

    • Characterization of electrospun poly(lactide) composites containing multiwalled carbon nanotubes 

      Ristić, Ivan; Miletić, Aleksandra; Vukić, Nevena; Marinović-Cincović, Milena; Smits, Krisjanis; Cakić, Suzana; Pilić, Branka (SAGE Publications Inc., 2019)
      The main aim of this work was to obtain conductive polymer-based materials by incorporation of different amounts of multiwalled carbon nanotubes (MWCNTs) into poly(lactide)(PLA) using the electrospinning technique. Fiber-based ...

    • Characterization of Mechanical Oscillations in Bismuth Selenide Nanowires at Low Temperatures 

      Jasulaneca, Liga; Poplausks, Raimonds; Prikulis, Juris; Dzene, Elza; Yager, Tom; Erts, Donats (MDPIO, 2023)
      A single transistor preamplifier circuit was designed to facilitate electrical detection of mechanical oscillations in nanoelectromechanical systems (NEMSs) at low temperatures. The amplifier was integrated in the close ...

    • Characterization of Structural Stability of Magnetron Sputtered Tungsten-boron Thin Films at Elevated Temperatures 

      Avotina, Liga; Goldmane, Annija Elizabete; Vanags, Edgars; Trimdale-Deksne, Aija; Bumbure, Lada; Romanova, Marina; Sorokins, Hermanis; Muhin, Alexei; Zaslavskis, Aleksandrs; Kizane, Gunta; Dekhtyar, Yuri (Kaunas University of Technology, 2023)
      In the divertor of the tokamak type fusion reactors tungsten and tungsten-covered plasma facing materials are currently among the selected materials. However, metallic, high-Z plasma facing materials require plasma mitigation. ...

    • Chemical-state analyses of Ni, Zn, and W ions in NiWO4–ZnWO4 solid solutions by X-ray photoelectron spectroscopy 

      Bakradze, Georgijs; Kalinko, Aleksandrs; Kuzmin, Alexei (Elsevier, 2022)
      The chemical states of Ni, Zn, and W in microcrystalline NiWO4–ZnWO4 solid solutions were studied by X-ray photoelectron spectroscopy. The recorded spectra of the Ni 2p, Zn 2p, and W 4f photoelectron lines and Ni L2M23M45, ...

    • Chlorine Adsorption on TiO2(110)/Water Interface: Nonadiabatic Molecular Dynamics Simulations for Photocatalytic Water Splitting 

      Lin, Yin-Pai; Bocharov, Dmitry; Isakoviča, Inta; Pankratov, Vladimir; Popov, Aleksandr A.; Popov, Anatoli I.; Piskunov, Sergei (MDPI, 2023)
      Chloride is one of the most abundant ions in sea water, which is more available than fresh water. Due to lack of H2O adsorbate states near the valence band maximum (VBM) edge, the difficulty of water dissociation incidents ...

    • Cilvēka dzīves gaitas attēlojums 17. un 18. gadsimta latviešu literatūrā 

      Grudule, Māra (1995)

    • Cilvēks un cilvēksituācija sabiedrībā un kultūrā: zinātniskās konferences rakstu krājums 

      LU Filozofijas un socioloģijas institūts; Latvijas Universitātes 81. starptautiskā zinātniskā konference. (LU Filozofijas un socioloģijas institūts, 2023-12-28)
      Krājumu veido LU Filozofijas un socioloģijas institūta (FSI) pētnieku LU FSI prioritārajā projektā “Kultūras, identitātes, starpkultūru komunikācijas un cilvēksituācijas pētījumi humānisma vērtību, konfliktu un krīžu ...

    • Cladding-Pumped Er/Yb-Co-Doped Fiber Amplifier for Multi-Channel Operation 

      Zakis, Kaspars; Olonkins, Sergejs; Udalcovs, Akeksejs; Lukosevics, Ingars; Prigunovs, Dmitrijs; Grube, Jurgis; Bikse, Liga; Supe, Andis; Ozolins, Oskars; Spolitis, Sandis; Bobrovs, Vjaceslavs (MDPI, 2022)
      Cladding-pumped erbium (Er3+)/ytterbium (Yb3+)-co-doped fiber amplifiers are more advantageous at high output powers. However, this amplification technique also has potential in telecom-related applications. These types ...

    • Cladding-Pumped Erbium/Ytterbium Co-Doped Fiber Amplifier for C-Band Operation in Optical Networks 

      Supe, Andis; Olonkins, Sergejs; Udalcovs, Aleksejs; Senkans, Ugis; Murnieks, Rihards; Gegere, Lilita; Prigunovs, Dmitrijs; Grube, Jurgis; Elsts, Edgars; Spolitis, Sandis; Ozolins, Oskars; Bobrovs, Vjaceslavs (MDPI, 2021)
      Space-division multiplexing (SDM) attracts attention to cladding-pumped optical amplifiers, but they suffer from a low pump power conversion efficiency. To address this issue, ytterbium (Yb3+) and erbium (Er3+) co-doping ...

    • Clinical evaluation of automated capillary refill time estimation in dogs and cats 

      Cugmas, Blaž; Štruc, Eva; Spīgulis, Jānis (SPIE, 2019-02-26)
      In this study, we clinically evaluated a pulse oximeter-based device for automated capillary refill time (CRT) estimation in dogs and cats. CRT can reveal conditions like shock or anemia in dogs and cats. However, visual ...

    • Co-doping with boron and nitrogen impurities in T-carbon 

      Tian, Zhenwei; Cui, Xiaoqian; Tian, Jiakun; Cui, Muchen; Jin, Li; Jia, Ran; Eglitis, Roberts I. (Elsevier B.V., 2020)
      Previously, Ren et al. [Chem. Phys. 518, 69–73, 2019] reported the failure of Boron-Nitrogen (B-N) co-doping as inter B-N bond in T-carbon. In present work, a B-N atom pair is introduced in T-carbon as p-n co-dopant to ...

    • CO2 and CH2 Adsorption on Copper-Decorated Graphene: Predictions from First Principle Calculations 

      Lisovski, Oleg; Piskunov, Sergei; Bocharov, Dmitry; Zhukovskii, Yuri F.; Kleperis, Janis; Knoks, Ainars; Lesnicenoks, Peteris (MDPI, 2022)
      Single-layer graphene decorated with monodisperse copper nanoparticles can support the size and mass-dependent catalysis of the selective electrochemical reduction of CO2 to ethylene (C2 H4 ). In this study, various active ...

    • Color constancy in dermatoscopy with smartphone 

      Cugmas, Blaž; Pernuš, Franjo; Likar, Boštjan (SPIE, 2017-12-07)
      The recent spread of cheap dermatoscopes for smartphones can empower patients to acquire images of skin lesions on their own and send them to dermatologists. Since images are acquired by different smartphone cameras under ...