• Thermal Oxidation of Tungsten Coatings for Detection by Infrared Spectrometry Method 

  Goldmane, Annija Elizabete; Avotina, Liga; Vanags, Edgars; Trimdale-Deksne, Aija; Zaslavskis, Aleksandrs; Kizane, Gunta; Dekhtyar, Yuri (IOP Publishing, 2023)

  Physical vapor deposition (PVD) of metallic thin films is used extensively in the fabrication of semiconductor technology devices - use as of lately for them have grown. Tungsten (W) is a low resistivity, refractory metal, ...

• Effect of Yb3+ doping level on the structure and spectroscopic properties of ZnO optical ceramics 

  Gorokhova, E.; Venevtsev, I.; Alekseeva, I.; Khubetsov, A.; Dymshits, O.; Basyrova, L.; Oreschenko, E.; Eron’ko, S.; Muktepavela, F.; Kundzins, K.; Zhilin, A.; Loiko, P. (Institute of Physics Publishing, 2021)

  Zinc oxide optical ceramics with hexagonal structure doped with 0.6 –5.0 wt% Yb were fabricated by uniaxial hot pressing of commercial oxide powders at 1180 °C in vacuum. The ceramics were characterized by X-ray diffraction, ...

• Studies of the possibilities to use ozone for the grain storage 

  Rucins, Adolfs; Straumite, Evita; Viesturs, Dainis; Kristins, Alberts (Rezekne Higher Education Institution, 2021)

  In this study was impact of ozone treatment efficiency of wheat quality (physical-chemical and microbiological parameters, chemical composition and germination rate) during storage analysed. Ozone is a powerful oxidizer, ...

• Energy level determination of purine containing blue light emitting organic compounds 

  Grzibovskis, Raitis; Vembris, Aivars; Sebris, Armands; Kapilinskis, Zigfrids; Turks, Maris (SPIE - International Society for Optics and Photonics, 2018)

  Organic light emitting diodes (OLED) have found their applications in the mobile and TV screens. Till now the commercially available diodes are made by expensive thermal evaporation in a vacuum. The costs of OLED fabrication ...

• 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 ...

• Synthesis of Eu2+ and Dy3+ doped strontium aluminates and their properties 

  Rozenberga-Voska, Laura; Grabis, Janis; Zolotarjovs, Aleksejs (Trans Tech Publications Ltd., 2017)

  Strontium aluminate phosphors were synthesized by the solution combustion method using citric acid, urea or glycine as reducing agent and europium and dysprosium as dopants. The content of both dopants was in the range of ...

• Investigations in intensification of grain drying by active ventilation applying ozone 

  Rucins, Adolfs; Viesturs, Dainis; Kristins, Alberts; Bruveris, Juris (Latvia University of Life Sciences and Technologies, 2020)

  The article presents an analysis of the previous research on the use of ozone for intensified active ventilation of grain and develops a methodology for experiments to evaluate the usefulness of ozone utilisation in ...

• Thermally induced fading of Mn-doped YAP nanoceramic 

  Martynyuk, Natalya; Popov, Anatoli I.; Zhydachevskyy, Yaroslav; Sugak, D.; Bilski, Paweł; Ubizskii, Sergii; Berkowski, Marek; Suchocki, Andrzej B. (Institute of Physics Publishing, 2018)

• Transition levels of acceptor impurities in ZnO crystals by DFT-LCAO calculations 

  Usseinov, A. B.; Zhukovskii, Yu. F.; Kotomin, Eugene A.; Akilbekov, A. T.; Zdorovets, M. V.; Baubekova, G. M.; Karipbayev, Zh. T. (Institute of Physics Publishing, 2018)

  Large scale ab-initio calculations are carried out to study the charge state transition levels of nitrogen and phosphorus impurity defects in zinc oxide crystals using the DFT-LCAO approximation as implemented into the ...

• Theoretical investigations of nitrogen doping on Co 3 O 4 for water dissociation catalytically activity 

  Kaptagay, G. A.; Mastrikov, Yuri A.; Kotomin, Eugene A.; Sandibaeva, S. A.; Kopenbaeva, A. S.; Baitasheva, G. O.; Baikadamova, L. S. (Institute of Physics Publishing, 2018)

  We report the results of theoretical investigations of nitrogen doping on Co 3 O 4 (100) bulk by means of the plane-wave periodic density functional theory (DFT) calculations combined with the Hubbard-U approach and ...

• Structural investigation of crystallized Ge-Ga-Se chalcogenide glasses 

  Klym, H.; Shpotyuk, O.; Karbovnyk, I.; Calvez, L.; Popov, Anatoli I. (Institute of Physics Publishing, 2019)

  Crystallization transformation in the 80GeSe2-20Ga2Se3 chalcogenide glasses caused by annealing at 380 °C during different duration (25, 50, 80 and 100 hours) are studied using X-ray diffraction and atomic force microscopy ...

• Synthesis and studying of reduced few-layered graphene coatings in gas sensor applications 

  Lukosevics, Ingars; Lesnicenoks, Peteris; Kleperis, Janis (Institute of Physics Publishing, 2019)

  In this work reduced few-layered graphene (rFLG) nanoparticles were synthesized using electrochemical pulse exfoliation method from waste graphite crucibles. The regular change in voltage polarity in the synthesis process ...

• PVA Hydrogel Electrolyte and Porous Polyisoprene Carbon Nanostructure Composite Based Pressure Sensitive Supercapacitor 

  Lapčinskis, L.; Cirulis, I.; Abele, A.; Šutka, A.; Knite, M.; Lesničenoks, Pēteris (Institute of Physics Publishing, 2019)

  Narrow operational voltage window can be considered as one of the greatest limitations for aqueous polymer electrolytes. Using freeze-thaw hydrogel preparation method we have synthesized wider potential window electrolytic ...

• 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 ...

• 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 ...

• Optical properties of zinc-iridium oxide thin films 

  Skvorcova, Vera; Zubkins, Martins; Kalendarev, Roberts; Arslan, Halil; Purans, Juris (Institute of Physics Publishing, 2019)

  We present the results of an investigation of ultraviolet, visible, near-infrared (UV-Vis-NIR) and X-ray absorption spectroscopy absorption spectra for zinc-iridium oxide (Zn-Ir- O) thin films with various iridium ...

• Optimization of the enzyme power source for a nano drug delivery system fuelled by glucose in blood plasma 

  Naidoo, S.; Thage, L.; Ying, Q.; Vallie, S.; Vaivars, Guntars (Institute of Physics Publishing, 2019)

  A unique in vivo electrical pulse generator to improve membrane permeability for drugs and simultaneously facilitate self-powered nano devices for nano drug delivery systems (NDDS) was identified. The use of an unsupported ...

• Negative thermal expansion of ScF3: First principles vs empirical molecular dynamics 

  Bocharov, Dmitry; Rafalskij, Yuri; Krack, Matthias; Putnina, Mara; Kuzmin, Alexei (Institute of Physics Publishing, 2019)

  The crystal lattice of cubic scandium fluorine (ScF3) exhibits negative thermal expansion (NTE) over a wide range of temperatures from 10 K to 1100 K. Here the NTE effect in ScF3 is studied using atomistic simulations based ...

• Nanoporous characterization of modified humidity-sensitive MgO-Al2O3 ceramics by positron annihilation lifetime spectroscopy method 

  Klym, H.; Ingram, A.; Hadzaman, I.; Karbovnyk, I.; Vasylchyshyn, I.; Popov, Anatoli I. (Institute of Physics Publishing, 2019)

  Investigation of nanopores in the humidity-sensitive MgO-Al2O3 ceramics modified at 1100°C for 2 hours was performed using positron annihilation lifetime spectroscopy method. Lifetimes of the third and fourth components ...

• Nafion® and polyaniline composite modification with Li and Mg ions 

  Lozkins, Stanislavs; Hodakovska, Julija; Kleperis, Janis; Merijs - Meri, Remo (Institute of Physics Publishing, 2019)

  Modification of Nafion®-based samples with polyaniline (PANI) and positive charged ions could potentially allow achieving good proton conductivity at higher working temperatures what is observed in typical polymer electrolyte ...

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