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

Now showing items 695-714 of 1025

    • 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 ...

    • Photoplethysmography for bovine heat detection: the preliminary results 

      Cugmas, Blaž; Plavšić, Aleksandar; Štruc, Eva; Spīgulis, Jānis (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 

      Cugmas, Blaž; Štruc, Eva; Spīgulis, Jānis (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 

      Latvels, Janis; Grzibovskis, Raitis; Pudzs, Kaspars; Vembris, Aivars; Blumberga, Dagnija (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 

      Skultāne, Vieda; Zirnīte, Māra; Zellis, Kaspars; Pazuhina, Nadežda; Šūpulis, Edmunds; Beitnere-La Galla, Dagmāra; Pranka, Maruta; Garda-Rozenberga, Ieva; Krūmiņa, Maija (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 ...

    • Pikseļu formas jautājumi rastra attēlu reprezentācijai un apstrādei 

      Freivalds, Kārlis; Ķikusts, Paulis (2013-01-23)

    • 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 ...

    • Platonism, intuition and the nature of mathematics 

      Podnieks, Karlis (Bulgarian Academy of Sciences, Sofia, 1988)
      Platonism is an essential aspect of mathematical method. Mathematicians are learned ability " t o   l i v e " in the "world" of mathematical concepts. Here we have the main source of the creative power of mathematics, and ...

    • Poēzijas balss un filosofija 

      Vilnīte, Oksana (LU Filozofijas un socioloģijas institūts, 2013)
      Latvijas izglītības un kultūras vēsture ir bagāta ar izcilām personībām, pie kurām jāmin arī Latvijas Universitātes mācībspēki. Filosofijas doktore, docente Oksana Vilnīte savu pasniedzējas mūža lielāko daļu – vairāk nekā ...

    • 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 ...

    • Political alienation and government-society relations in Post-Communist countries 

      Mieriņa, Inta (Polskie Towarzystwo Socjologiczne, 2014)

    • Poor optical stability of molecular dyes when used as absorbers in water-based tissue-simulating phantoms 

      Cugmas, Blaž; Naglič, Peter; Menachery, Sunil Paul Matthew; Pernuš, Franjo; Likar, Boštjan (SPIE, 2019-02-27)
      Biomedical optical systems and models can be easily validated by the use of tissue-simulating phantoms. They can consist of water-based turbid media which often include inks (India ink and molecular dyes) as absorbers. ...

    • 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 ...

    • Prediction of the next value of a function 

      Podnieks, Karlis (1981)
      The following model of inductive inference is considered. Arbitrary set tau = {tau_1, tau_2, ..., tau_n} of n total functions N->N is fixed. A "black box" outputs the values f(0), f(1), ..., f(m), ... of some function f ...

    • 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. ...

    • Pressure-induced structural changes in α-MoO3 probed by X-ray absorption spectroscopy 

      Jonane, Inga; Anspoks, Andris; Nataf, Lucie; Baudelet, Francois; Irifune, Tetsuo; Kuzmin, Alexei (Institute of Physics Publishing, 2019)
      Energy-dispersive X-ray absorption spectroscopy at the Mo K-edge was used to study pressure-induced (up to 36 GPa) changes in the local atomic structure of 2D layered oxide α-MoO3. A linear combination analysis based on ...