Browsing Zinātniskie raksti (CFI) / Scientific articles by Title

Now showing items 368-387 of 514

    • Photoluminescence and Electron Spin Resonance of ilicon Dioxide Crystal with Rutile Structure (Stishovite) 

      Trukhin, Anatoly; Antuzevics, Andris (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 

      Sebris, Armands; Novosjolova, Irina; Traskovskis, Kaspars; Kokars, Valdis; Tetervenoka, Natalija; Vembris, Aivars; Turks, Māris (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 ...

    • Plasma Dynamics Characterization for Improvement of Resonantly Enhanced Harmonics Generation in Indium and Tin Laser-Produced Plasmas 

      Kim, Vyacheslav V.; Butikova, Jelena; Grube, Jurgis; Sarakovskis, Anatolijs; Ganeev, Rashid A. (MDPI, 2022)
      In this study, we characterize the properties of indium and tin laser-induced plasmas responsible for efficient high-order harmonics generation of the ultrashort pulses propagating through these media. The optimally formed ...

    • Plasma-wall interaction studies within the EUROfusion consortium: Progress on plasma-facing components development and qualification 

      Brezinsek, Sebastijan; Coenen, J. W.; Schwarz-Selinger, Thomas; Schmid, Klaus; Kirschner, Andreas; Hakola, Antti H.; Tabarés, Francisco L.; van der Meiden, Hennie J.; Mayoral, Marie Line; Reinhart, Michael; Tsitrone, Emmanuelle; Ahlgren, Tommy; Aints, Märt H.; Airila, Markus I.; Almaviva, Salvatore; Alves, E.; Angot, Thierry; Aniţa, Viorel; Arredondo Parra, R.; Friedrich, Aumayr; Balden, Martin; Bauer, J.; Ben Yaala, Marwa; Berger, Bernhard M.; Bisson, Régis; Björkas, C. ; Bogdanovic Radovic, I. ; Borodin, D. ; Bucalossi, J. ; Butikova, Jelena;  Butoi, B.; Čadež, I. ; Caniello, R. ; Caneve, L. ; Cartry, G. ;  Catarino, N.; Čekada, M. ;  Ciraolo, G.; Ciupinski, L. ; Colao, F. ;  Corre, Y.; Costin, C. ; Craciunescu, T. ; Cremona, A. ; De Angeli, M. ;  de Castro, A.; Dejarnac, R. ; Dellasega, D. ; Dinca, P. ; Dittmar, T. ; Dobrea, C. ; Hansen, P. ; Drenik, A. ; Eich, T. ; Elgeti, S. ; Falie, D. ;  Fedorczak, N.; Ferro, Y. ; Fornal, T. ; Fortuna-Zalesna, E. ; Gao, L. ;  Gasior, P.;  Gherendi, M.; Ghezzi, F. ; Gosar, Ž. ; Greuner, H. ; Grigore, E. ; Grisolia, C. ; Groth, M. ;  Gruca, M.; Grzonka, J. ;  Gunn, J.P.; Hassouni, K. ;  Heinola, K.; Höschen, T. ; Huber, S. ; Jacob, W. ; Jepu, I. ; Jiang, X. ;  Jogi, I.;  Kaiser, A.;  Karhunen, J.;  Kelemen, M.; Köppen, M. ;  Koslowski, H.R.; Kreter, A. ; Kubkowska, M. ; Laan, M. ; Laguardia, L. ; Lahtinen, A. ; Lasa, A. ;  Lazic, V.;  Lemahieu, N.; Likonen, J. ;  Linke, J.;  Litnovsky, A.; Linsmeier, Ch. ; Loewenhoff, T. ; Lungu, C. ; Lungu, M. ; Maddaluno, G. ;  Maier, H.; Makkonen, T. ; Manhard, A. ; Marandet, Y. ;  Markelj, S.; Marot, L. ;  Martin, C.;  Martin-Rojo, A.B.; Martynova, Y. ; Mateus, R. ; Matveev, D. ; Mayer, M. ; Meisl, G. ; Mellet, N. ;  Michau, A.; Miettunen, J. ;  Möller, S.;  Morgan, T.W.; Mougenot, J. ; Mozetič, M. ; Nemanič, V. ; Neu, R. ; Nordlund, K. ; Oberkofler, M. ; Oyarzabal, E. ;  Panjan, M.; Pardanaud, C. ;  Paris, P.; Passoni, M. ; Pegourie, B. ; Pelicon, P. ;  Petersson, P.; Piip, K. ; Pintsuk, G. ; Pompilian, G.O. ; Popa, G. ; Porosnicu, C. ; Primc, G. ;  Probst, M.; Räisänen, J. ; Rasinski, M. ; Ratynskaia, S. ; Reiser, D. ;  Ricci, D.; Richou, M. ; Riesch, J. ;  Riva, G.; Rosinski, M. ; Roubin, P. ; Rubel, M. ; Ruset, C. ; Safi, E. ; Sergienko, G. ; Siketic, Z. ; Sima, A. ; Spilker, B. ; Stadlmayr, R. ;  Steudel, I.; Ström, P. ; Tadic, T. ; Tafalla, D. ;  Tale, I.; Terentyev, D. ; Terra, A. ; Tiron, V. ; Tiseanu, I. ; Tolias, P. ; Tskhakaya, D. ;  Uccello, A.; Unterberg, B. ; Uytdenhoven, I. ; Vassallo, E. ;  Vavpetič, P.; Veis, P. ; Velicu, I.L. ;  Vernimmen, J.W.M.; Voitkans, Arnis; von Toussaint, U. ; Weckmann, A. ; Wirtz, M. ; Založnik, A. ; Zaplotnik, R. ; WP PFC, contributors (Institute of Physics Publishing, 2018)
      The provision of a particle and power exhaust solution which is compatible with first-wall components and edge-plasma conditions is a key area of present-day fusion research and mandatory for a successful operation of ITER ...

    • Polarization and acoustic properties of barium-modified lead-free potassium–sodium niobate ceramics 

      Bormanis, Karlis; Burkhanov, Anver I.; Sternberg, Andris; Zhirkov, Aleksandr V.; Antonova, Maija; Kalvane, Anna; Ignatans, Reinis (Estonian Academy Publishers, 2017)
      Results of polarization and polarization switching in samples prepared by solid phase synthesis of the (1-х)(K0.5Na0.5)(Nb0.93Sb0.07)O3–xBaTiO3 + 0.5mol%MnO2 system at x = 0.01, 0.02, and 0.04 (KNNS7–xBT) studied over a ...

    • Portable low-cost open-source wireless spectrophotometer for fast and reliable measurements 

      Laganovska, Katrina; Zolotarjovs, Aleksejs; Vázquez, Mercedes; Mc Donnell, Kirsty; Liepins, Janis; Ben-Yoav, Hadar; Karitans, Varis; Smits, Krisjanis (Elsevier Ltd, 2020)
      We demonstrate a low-cost standalone portable spectrophotometer for fast and reliable measurement execution. The data acquired can be both displayed via a dedicated smartphone application or a computer interface, allowing ...

    • Positron annihilation lifetime spectroscopy insight on free volume conversion of nanostructured MgAl2 O4 ceramics 

      Klym, Halyna; Karbovnyk, Ivan; Piskunov, Sergei; Popov, Anatoli I. (Multidisciplinary Digital Publishing Institute (MDPI), 2021)
      Herein we demonstrate the specifics of using the positron annihilation lifetime spectroscopy (PALS) method for the study of free volume changes in functional ceramic materials. Choosing technological modification of ...

    • Post deposition annealing effect on properties of CdS films and its impact on CdS/Sb2Se3 solar cells performance 

      Gopi, Sajeesh Vadakkedath; Spalatu, Nicolae; Basnayaka, Madhawa; Katerski, Atanas; Josepson, Raavo; Grzibovskis, Raitis; Vembris, Aivars; Krautmann, Robert; Krunks, Malle; Acik, Ilona Oja (Frontiers Media, 2023)
      Antimony selenide (Sb2Se3) is one of the emerging photovoltaic absorber materials possessing abundance and non-toxicity as the main attributes. Following CdTe technology, CdS is a widely used partner layer for Sb2Se3 solar ...

    • Preparation and dielectric properties of (Na0.5K0.5)NbO3 ceramics with ZnO and CdO addition 

      Garbarz-Glos, Barbara; Klimkowski, Grzegorz; Śmiga, Włodzimierz; Antonova, Maija; Kalvane, Anna (Taylor and Francis Ltd., 2019)
      The sintering conditions, phase structure, and electrical properties of the ZnO and CdO doped (Na0.5K0.5)NbO3 (NKN) ceramics were investigated and discussed. All the samples were prepared by a solid state reaction method. ...

    • Probing densified silica glass structure by molecular oxygen and E’ center formation under electron irradiation 

      Ollier, N.; Reghioua, I.; Cavani, O.; Mobasher, M.; Alessi, A.; le Floch, S.; Skuja, Linards (Nature Research, 2023)
      This study aims to learn more about the structure of densified silica with focus on the metamict-like silica phase (density = 2.26 g/cm3) by examining the formation of E’ point defects and interstitial molecular oxygen O2 ...

    • Probing the Thermochromic Phase Transition in CuMoO4 by EXAFS Spectroscopy 

      Jonane, Inga; Cintins, Arturs; Kalinko, Aleksandr; Chernikov, Roman V.; Kuzmin, Alexei (Wiley-VCH Verlag, 2018)
      Extended X-ray absorption fine structure (EXAFS) spectroscopy at the Mo K-edge is used to follow the thermochromic γ-to-α phase transition in copper molybdate (CuMoO4). The temperature dependence (10–300 K) of the radial ...

    • Production of Phosphorescent Coatings on 6082 Aluminum Using Sr0.95Eu0.02Dy0.03Al2O4-δ Powder and Plasma Electrolytic Oxidation 

      Auzins, Krisjanis; Zolotarjovs, Aleksejs; Bite, Ivita; Laganovska, Katrina; Vitola, Virginija; Smits, Krisjanis; Millers, Donats (MDPI AG, 2019)
      In this study, a new approach for producing phosphorescent aluminum coatings was studied. Using the plasma electrolytic oxidation (PEO) process, a porous oxide coating was produced on the Al6082 aluminum alloy substrate. ...

    • Programmable material testing device for mechanoluminescence measurements 

      Einbergs, Ernests; Zolotarjovs, Aleksejs (Elsevier, 2022)
      Mechanoluminescent materials transform mechanical energy into visible light. Phenomena could prove to be advantageous to various next-generation monitoring systems employed in the fields of security and healthcare if the ...

    • Progress in development of a new luminescence setup at the FinEstBeAMS beamline of the MAX IV laboratory 

      Pankratov, Vladimir; Pärna, Rainer; Kirm, Marko; Nagirnyi, Vitali; Nõmmiste, Ergo; Omelkov, Sergei; Vielhauer, Sebastian; Chernenko, Kirill; Reisberg, Liis; Turunen, Paavo; Kivimäki, Antti; Kukk, Edwin; Valden, Mika; Huttula, Marko (Elsevier Ltd, 2019)
      FinEstBeAMS is a new materials science beamline at the 1.5 GeV storage ring of the MAX IV Laboratory in Lund, Sweden. It has been built based on grazing incidence monochromatization of synchrotron light, which allows to ...

    • Prospects of Decarbonizing Industrial Areas in the Baltic States by Means of Alternative Fuels 

      Mezulis, Ansis; Kleperis, Janis; Lesnicenoks, Peteris; Zemite, Laila (Polskie Towarzystwo Inzynierii Ekologicznej (PTIE), 2022)
      All three Baltic States have reached good fi gures regarding the change in total greenhouse gas emissions from transport during 1990-2017. Particularly successful is Lithuania, showing a negative value of -2.7%. Latvia ...

    • Proton migration barriers in BaFeO3-δ – insights from DFT calculations 

      Hoedl, M.F.; Chesnokov, Andrei; Gryaznov, Denis; Merkle, R.; Kotomin, Eugene A.; Maier, J. (Royal Society of Chemistry, 2023)

    • Proton migration barriers in BaFeO3−δ – insights from DFT calculations 

      Hoedl, M. F.; Chesno, Andrei; Gryaznov, Denis; Merkle, R.; Kotomin, Eugene A.; Maier, J. (Royal Society of Chemistry, 2023)
      Proton migration in the triple conducting perovskite BaFeO3−δ is investigated using first-principles density functional theory calculations. Oxygen-deficient BaFeO3−δ exhibits pronounced lattice distortions that entail ...

    • Pulsed Electric Field: Fundamentals and Effects on the Structural and Techno-Functional Properties of Dairy and Plant Proteins 

      Taha, Ahmed; Casanova, Federico; Šimonis, Povilas; Stankevič, Voitech; Gomaa, Mohamed A. E.; Stirkė, Arūnas (MDPI, 2022)
      Dairy and plant-based proteins are widely utilized in various food applications. Several techniques have been employed to improve the techno-functional properties of these proteins. Among them, pulsed electric field (PEF) ...

    • Pulsed Electric Fields Alter Expression of NF-κB Promoter-Controlled Gene 

      Kavaliauskaite, Justina; Kazlauskaitė, Aukse; Lazutka, Juozas Rimantas; Mozolevskis, Gatis; Stirkė, Arunas (MDPI, 2022)
      The possibility to artificially adjust and fine‐tune gene expression is one of the key mile-stones in bioengineering, synthetic biology, and advanced medicine. Since the effects of proteins or other transgene products ...

    • Quantitative optical analysis of filler dispersion degree in MWCNT – epoxy nanocomposite 

      Glaskova, Tatjana; Zarrelli, Mauro; Aniskevich, Andrey; Giordano, Michele; Trinkler, Laima; Berzina, Baiba (Elsevier, 2012)