Zobrazeno 1 - 10
of 22
pro vyhledávání: '"Reinis DRUNKA"'
Autor:
Ashish Kumar Singh, Reinis Drunka, Paula Iesalniece, Ilmars Blumbergs, Ints Steins, Toms-Valdemars Eiduks, Mairis Iesalnieks, Konstantins Savkovs
Publikováno v:
Surfaces, Vol 6, Iss 4, Pp 364-379 (2023)
Oxide films produced from plasma electrolytic oxidation are porous in structure. While they have some passivating effect in Mg alloys, the pores still lead to corrosion over long periods of exposure. In this study, spray pyrolysis was used to seal th
Externí odkaz:
https://doaj.org/article/8da056ab345e46b1901bac1660ba703e
Publikováno v:
Medžiagotyra, Vol 29, Iss 3, Pp 298-304 (2023)
The plasma electrolytic oxidation method was used with AZ31 magnesium alloy plates for improving the corrosion resistance of the alloy. Process parameters for the plasma electrolytic oxidation setup were optimized by studying the effects of KOH conce
Externí odkaz:
https://doaj.org/article/75d5f98dc9ba46a099f44be4c34f7861
Autor:
Toms Valdemars Eiduks, Reinis Drunka, Vitalijs Abramovskis, Ilmars Zalite, Pavels Gavrilovs, Janis Baronins, Vjaceslavs Lapkovskis
Publikováno v:
Materials, Vol 17, Iss 2, p 450 (2024)
The current investigation presents porous ceramic materials prepared with cenospheres (CS) by using spark plasma sintering. The impact of sintering temperature, mould diameter (20, 30 and 50 mm) and cenosphere size on the properties of the sintered m
Externí odkaz:
https://doaj.org/article/eeae5552ffa84bada74838c17c7cb1c4
Autor:
Vitalijs Abramovskis, Reinis Drunka, Štefan Csáki, František Lukáč, Jakub Veverka, Ksenia Illkova, Pavels Gavrilovs, Andrei Shishkin
Publikováno v:
Materials, Vol 16, Iss 24, p 7523 (2023)
By applying the physical vapour deposition method, hollow ceramic microspheres were coated with titanium, and subsequently, they were sintered using the spark plasma sintering technique to create a porous ceramic material that is lightweight and devo
Externí odkaz:
https://doaj.org/article/7d08b37651444c8bb7bf7c097e46dcae
Autor:
Ashish Kumar Singh, Reinis Drunka, Krisjanis Smits, Martins Vanags, Mairis Iesalnieks, Aiga Anna Joksa, Ilmars Blumbergs, Ints Steins
Publikováno v:
Crystals, Vol 13, Iss 3, p 508 (2023)
Lightweight magnesium alloys offer excellent benefits over Al alloys due to their high specific strength and damping properties, but they are more prone to galvanic corrosion. Plasma electrolytic oxidation (PEO) coatings reinforced by nanoparticles h
Externí odkaz:
https://doaj.org/article/9d4b54a3bb2e43aa86b8ff932e1c352f
Autor:
Renate Kalnina, Ieva Demjanenko, Kristaps Smilgainis, Kristaps Lukins, Arnis Bankovics, Reinis Drunka
Publikováno v:
Water, Vol 14, Iss 22, p 3701 (2022)
The case study presented in the paper is the first in the field to find microplastic (MP) particles in both grey water (GW) and post-treatment sewage (TS) samples, which can also be legally discharged into specially protected areas. Compiling a data
Externí odkaz:
https://doaj.org/article/ed5a8d85128b44fdb84ab1b1d1691b8e
Publikováno v:
Medžiagotyra, Vol 22, Iss 1, Pp 138-141 (2016)
In the present work formation of active TiO2 nanoparticles in microwave synthesis and their modification with platinum were studied. Anatase nanopowder and 10 M KOH solution were used as raw materials. Microwave assisted synthesis method permited to
Externí odkaz:
https://doaj.org/article/66ebc2e4f96b472d937f90afb2d5fde6
Oxidation of 1,2-Propanediol to Lactic Acid under Novel Supported Au Catalysts and Reaction Kinetics
Autor:
Konstantins Dubencovs, Svetlana Chornaja, Dzidra Jankoviča, Reinis Drunka, Elina Sile, Jevgenija Vladiko, Svetlana Zhizhkuna
Publikováno v:
Key Engineering Materials. 850:41-47
This work demonstrates that 5wt% gold catalysts supported on Al2O3 and TiO2 nanopowders as well as on TiO2 nanofibers are active in the 1,2-propanediol (1,2-PDO) oxidation to lactic acid. The influence of catalysts different parameters and reaction c
Publikováno v:
Key Engineering Materials. 850:48-53
1.25 – 5wt%Pt/Al2O3, 1.25 – 5wt%Pd/Al2O3, 1wt%Pd/TiO2, 1 – 5wt%Pd/TiO2-NF, 1.25wt%Pt+1.25wt%Pd/Al2O3, 5wt%Pt/SiO2, 5wt%Pt/C catalysts were synthesised and tested in the selective oxidation of 1,2-propanediol by molecular oxygen. It was found th
Publikováno v:
Key Engineering Materials. 800:132-137
Microwave-assisted hydrothermal synthesis of TiO2 nanofibers under various temperature and pressure conditions were done in this research. High quality TiO2 nanofiber coatings where obtained when temperature was in range 240 – 245 °C and pressure