• On the Symmetry, Electronic Properties, and Possible Metallic States in NASICON-Structured A4V2(PO4)3 (A = Li, Na, K) Phosphates 

  Gryaznov, Denis; Vilčiauskas, Linas (2023)

  In this work, the electronic structure and properties of NASICON-structured A4V2(PO4)3, where A = Li, Na, K were studied using hybrid density functional theory calculations. The symmetries were analyzed using a group ...

• Sol–Gel Synthesis of Translucent and Persistent Luminescent SiO2@ SrAl2O4 Eu, Dy, B Materials 

  Leimane, Madara; Krizmane, Katrina; Bite, Ivita; Grube, Jurgis; Vitola, Virginija (MDPI, 2023)

  This publication offers an economically promising method of persistent luminescent silicate glass synthesis that does not involve high temperatures or ready-made (separately synthesized) PeL particles. In this study, we ...

• Studies on Water–Aluminum Scrap Reaction Kinetics in Two Steps and the Efficiency of Green Hydrogen Production 

  Mezulis, Ansis; Richter, Christiaan; Lesnicenoks, Peteris; Knoks, Ainars; Varnagiris, Sarunas; Urbonavicius, Marius; Milcius, Darius; Kleperis, Janis (MDPI, 2023)

  This work aims to explain aluminum hydrolysis reaction kinetics based on a properly chosen theoretical model with machined aluminum waste chips as well as alkali solutions up to 1M as a promoter and to estimate the overall ...

• Study of the Influence of the Irradiation Flux Density on the Formation of a Defect Structure in AlN in the Case of the Effect of Overlapping of the Heavy Ion Motion Trajectories in the Near-Surface Layer 

  Bikhert, Yeugeniy V.; Kozlovskiy, Artem L.; Popov, Anatoli I.; Zdorovets, Maxim V. (MDPI, 2023)

  The aim of this paper is to test the previously stated hypothesis and several experimental facts about the effect of the ion flux or ion beam current under irradiation with heavy ions on the radiation damage formation in ...

• Modeling of the Lattice Dynamics in Strontium Titanate Films of Various Thicknesses: Raman Scattering Studies 

  Krasnenko, Veera; Platonenko, Alexander; Liivand, Aleksandr; Rusevich, Leonid L.; Mastrikov, Yuri A.; Zvejnieks, Guntars; Sokolov, Maksim; Kotomin, Eugene A. (MDPI, 2023)

  While the bulk strontium titanate (STO) crystal characteristics are relatively well known, ultrathin perovskites’ nanostructure, chemical composition, and crystallinity are quite complex and challenging to understand in ...

• Tungsten–SiO2–Based Planar Field Emission Microtriodes with Different Electrode Topologies 

  Avotina, Liga; Bikse, Liga; Dekhtyar, Yuri; Goldmane, Annija Elizabete; Kizane, Gunta; Muhin, Aleksei; Romanova, Marina; Smits, Krisjanis; Sorokins, Hermanis; Vilken, Aleksandr; Zaslavskis, Aleksandrs (MDPI, 2023)

  This study examines the electrical properties and layer quality of field emission microtriodes that have planar electrode geometry and are based on tungsten (W) and silicon dioxide (SiO2). Two types of microtriodes were ...

• Sb2S3 Thin-Film Solar Cells Fabricated from an Antimony Ethyl Xanthate Based Precursor in Air 

  Eensalu, Jako S.; Mandati, Sreekanth; Don, Christopher H.; Finch, Harry; Dhanak, Vinod R.; Major, Jonathan D.; Grzibovskis, Raitis; Tamm, Aile; Ritslaid, Peeter; Josepson, Raavo; Käämbre, Tanel; Vembris, Aivars (American Chemical Society, 2023)

  The rapidly expanding demand for photovoltaics (PVs) requires stable, quick, and easy to manufacture solar cells based on socioeconomically and ecologically viable earth-abundant resources. Sb2S3 has been a potential ...

• 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%) ...

• ITO Thin Films for Low-Resistance Gas Sensors 

  Almaev, Aleksei V.; Kopyev, Viktor V.; Novikov, Vadim A.; Chikiryaka, Andrei V.; Yakovlev, Nikita N.; Usseinov, Abay B.; Karipbayev, Zhakyp T.; Akilbekov, Abdirash T.; Koishybayeva, Zhanymgul K.; Popov, Anatoli I. (MDPI, 2023)

  Indium tin oxide thin films were deposited by magnetron sputtering on ceramic aluminum nitride substrates and were annealed at temperatures of 500 °C and 600 °C. The structural, optical, electrically conductive and ...

• Graphene Hybrid Metasurfaces for Mid-Infrared Molecular Sensors 

  Yager, Tom; Chikvaidze, George; Wang, Qin; Fu, Ying (MDPI, 2023)

  We integrated graphene with asymmetric metal metasurfaces and optimised the geometry dependent photoresponse towards optoelectronic molecular sensor devices. Through careful tuning and characterisation, combining ...

• Effects of Pulsed Electric Field on the Physicochemical and Structural Properties of Micellar Casein 

  Taha, Ahmed; Casanova, Federico; Talaikis, Martynas; Stankevič, Voitech; Žurauskienė, Nerija; Šimonis, Povilas; Pakštas, Vidas; Jurkūnas, Marijus; Gomaa, Mohamed A. E.; Stirkė, Arūnas (MDPI, 2023)

  Pulsed electric field (PEF) as a green processing technology is drawing greater attention due to its eco-friendliness and potential to promote sustainable development goals. In this study, the effects of different electric ...

• Filterless Visible-Range Color Sensing and Wavelength-Selective Photodetection Based on Barium/Nickel Codoped Bandgap-Engineered Potassium Sodium Niobate Ferroelectric Ceramics 

  Balanov, Vasilii A.; Temerov, Filipp; Pankratov, Vladimir; Cao, Wei; Bai, Yang (Wiley-Blackwell, 2023)

  Photosensors, photodetectors, or color sensors are key components for various optical and optoelectronic applications. Semiconductor-based photodetection has been a dominator which is excellent at measuring the photon ...

• Efficient ultrafast laser writing with elliptical polarization 

  Lei, Yuhao; Shayeganrad, Gholamreza; Wang, Huijun; Sakakura, Masaaki; Yu, Yanhao; Wang, Lei; Kliukin, Dmitrii; Skuja, Linards; Svirko, Yuri; Kazansky, Peter G. (Springer Nature, 2023)

  Photosensitivity in nature is commonly associated with stronger light absorption. It is also believed that artificial optical anisotropy to be the strongest when created by light with linear polarization. Contrary to ...

• Critical Evaluation of the Methods for the Characterization of the Degree of Sulfonation for Electron Beam Irradiated and Non-Irradiated Sulfonated Poly(ether ether ketone) Membranes 

  Pakalniete, Laura Dace; Maskova, Elizabete; Zabolockis, Rudolfs Janis; Avotina, Liga; Sprugis, Einars; Reinholds, Ingars; Rzepna, Magdalena; Vaivars, Guntars; Pajuste, Elina (MDPI, 2023)

  Sulfonated poly(ether ether ketone) (SPEEK) materials are promising candidates for replacing Nafion™ in applications such as proton exchange membrane (PEM) and direct methanol fuel cells. SPEEK membranes have several ...

• Amorphous Calcium Phosphate and Amorphous Calcium Phosphate Carboxylate: Synthesis and Characterization 

  Indurkar, Abhishek; Choudhary, Rajan; Rubenis, Kristaps; Nimbalkar, Mansingraj; Sarakovskis, Anatolijs; Boccaccini, Aldo R.; Locs, Janis (American Chemical Society, 2023)

  Amorphous calcium phosphate (ACP) is the first solid phase precipitated from a supersaturated calcium phosphate solution. Naturally, ACP is formed during the initial stages of biomineralization and stabilized by an organic ...

• Ab Initio Modeling of CuGa1−xInxS2, CuGaS2(1−x)Se2x and Ag1−xCuxGaS2 Chalcopyrite Solid Solutions for Photovoltaic Applications 

  Grechenkov, Jurij; Gopejenko, Aleksejs; Bocharov, Dmitry; Isakoviča, Inta; Popov, Anatoli I.; Brik, Mikhail G.; Piskunov, Sergei (MDPI, 2023)

  Chalcopyrites are ternary semiconductor compounds with successful applications in photovoltaics. Certain chalcopyrites are well researched, yet others remain understudied despite showing promise. In this study, we use ab ...

• Starptautiskā konference "Jauno vēsturnieku zinātniskie lasījumi IX": Konferences referātu tēzes, Valmieras muzejs, 2023. gada 1.–2. decembris 

  Bikše, Ginta Ieva (2023)

  Starptautisko konferenci “Jauno vēsturnieku zinātniskie lasījumi IX” rīko Latvijas Universitātes Latvijas vēstures institūts un Valmieras muzejs, sadarbībā ar Vītauta Dižā Universitāti Kauņā, Lietuvas Vēstures institūtu ...

• Jauno vēsturnieku zinātniskie lasījumi, VIII 

  Bikše, Ginta Ieva; Rokpelnis, Alberts (2023)

  Izdevumā publicēti 19 raksti, kuru pamatā ir 2022. gada 24. un 25. novembrī Latvijas Universitātes (LU) Latvijas vēstures institūta un Valmieras muzeja sadarbībā ar Vītauta Dižā Universitāti Kauņā, Lietuvas Vēstures institūtu ...

• Examining the Effect of Cu and Mn Dopants on the Structure of Zinc Blende ZnS Nanopowders 

  Kuzmin, Alexei; Pudza, Inga; Dile, Milena; Laganovska, Katrina; Zolotarjovs, Aleksejs (MDPI, 2023)

  It is known that doping zinc sulfide (ZnS) nanoparticles with Mn or Cu ions significantly affects their luminescent properties. Herein, we investigated how dopant atoms are incorporated into the structure of ZnS using X-ray ...

• Unraveling the interlayer and intralayer coupling in two-dimensional layered MoS2 by X-ray absorption spectroscopy and ab initio molecular dynamics simulations 

  Pudza, Inga; Bocharov, Dmitry; Anspoks, Andris; Krack, Matthias; Kalinko, Aleksandr; Welter, Edmund; Kuzmin, Alexei (Elsevier, 2023)

  Understanding interlayer and intralayer coupling in two-dimensional layered materials (2DLMs) has fundamental and echnological importance for their large-scale production, engineering heterostructures, and development of ...

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