Zobrazeno 1 - 10
of 85
pro vyhledávání: '"Jaroslav Hornak"'
Autor:
Stefan Hardon, Jozef Kudelcik, Anton Baran, Pavel Trnka, Ondrej Michal, Adam Tamus, Tomasz Koltunowicz, Alena Kozakova, Tomas Derer, Jaroslav Hornak
Publikováno v:
IEEE Access, Vol 12, Pp 114227-114241 (2024)
The aim of study is addressing the influence of nanoparticles (NPs) on the dielectric properties of polyurethane. In this research, only investigated the effect of Al2O3, MgO and ZnO NPs for concentrations up to 2 wt.% with the temperature range from
Externí odkaz:
https://doaj.org/article/e8d0819849624c43861465eee34003d4
Autor:
Jaroslav Hornak, Jakub Černohous, Pavel Prosr, Pavel Rous, Pavel Trnka, Anton Baran, Štefan Hardoň
Publikováno v:
Polymers, Vol 15, Iss 6, p 1532 (2023)
Recently, polyurethanes (PURs) have become a very promising group of materials with considerable utilization and innovation potential. This work presents a comprehensive analysis of the changes in material properties important for PUR applications in
Externí odkaz:
https://doaj.org/article/db78a4f655ef48eaab8ccc139dd95958
Autor:
Jozef Kudelcik, Stefan Hardon, Peter Hockicko, Maria Kudelcikova, Jaroslav Hornak, Pavel Prosr, Pavel Trnka
Publikováno v:
IEEE Access, Vol 9, Pp 49547-49556 (2021)
This study presents the influence of various types of nanoparticle (NP) fillers incorporated into a polyurethane (PU) (VUKOL 022) matrix and its subsequent changes in complex permittivity. Two types of surface modification of SiO2 fillers were invest
Externí odkaz:
https://doaj.org/article/a00704be1a604422894aab28e131c74c
Publikováno v:
IEEE Access, Vol 8, Pp 61989-61998 (2020)
This article adds more information to the problem of natural ester use as an electroinsulating fluid in cellulose paper-oil systems, e.g., for use in power transformers. An accelerated thermal aging (120, 140 and 160 °C) of samples consisting of cel
Externí odkaz:
https://doaj.org/article/b5161edfdbec45aeb2d215d84fee69e3
Publikováno v:
Polymers, Vol 14, Iss 11, p 2202 (2022)
The influence of various types of nanoparticle fillers with the same diameter of 20 nm were separately incorporated into a single component impregnating resin based on a polyesterimide (PEI) matrix and its subsequent changes in complex relative permi
Externí odkaz:
https://doaj.org/article/3dc5e7dad52f4e9087967422270a5106
Autor:
Jaroslav Hornak
Publikováno v:
International Journal of Molecular Sciences, Vol 22, Iss 23, p 12752 (2021)
In the last few decades, there has been a trend involving the use of nanoscale fillers in a variety of applications. Significant improvements have been achieved in the areas of their preparation and further applications (e.g., in industry, agricultur
Externí odkaz:
https://doaj.org/article/48ee942a8216452885a14846e295d3cb
Publikováno v:
Polymers, Vol 13, Iss 3, p 375 (2021)
The influence of different concentrations (0.5, 1.0, and 2.0 wt.%) of Zinc Oxide (ZnO) filler on the dielectric properties of the cold-curing polyurethane (PU) resin is presented in this study. For this purpose, the direct DC conductivity and the bro
Externí odkaz:
https://doaj.org/article/8399679628494682a3bc1aa6e0e8ca6d
Publikováno v:
Polymers, Vol 12, Iss 9, p 1881 (2020)
At present, the most commonly used electrical insulating materials, including cold-curing epoxy resins, are well designed for normal operating conditions. However, new generations of materials should also be capable of withstanding extreme emergency
Externí odkaz:
https://doaj.org/article/7636524498654879b5ae159feb7fc8f4
Publikováno v:
Applied Sciences, Vol 9, Iss 14, p 2926 (2019)
This paper deals with the topic of composite insulation materials for rotating machines and it is primarily pointed to the synthesis of new three-component insulation system. In connection with this research, the basic components of the insulation sy
Externí odkaz:
https://doaj.org/article/30ce4020de2e40aa842c8b3127261857
Autor:
Jaroslav Hornak, Pavel Trnka, Petr Kadlec, Ondřej Michal, Václav Mentlík, Pavol Šutta, Gergely Márk Csányi, Zoltán Ádám Tamus
Publikováno v:
Nanomaterials, Vol 8, Iss 6, p 381 (2018)
Composite insulation materials are an inseparable part of numerous electrical devices because of synergy effect between their individual parts. One of the main aims of the presented study is an introduction of the dielectric properties of nanoscale m
Externí odkaz:
https://doaj.org/article/bb6ef10483ae4742b65d3759fb6ff78f