35 research outputs found
Encapsulation of power electronics components for operation in harsh environments
This paper reports on analyses and testing of sensitive power electronics components
encapsulation concept, enabling operation in harsh, especially high pressure
environments. The paper describes development of the concept of epoxy modules that
can be used for protecting of the power electronics components against harsh environmental
conditions. It covers modeling of the protective capsules using a simple analytical
approach and Finite Element Method (FEM) models and validation of the developed
models with the high pressure tests on samples fabricated. The analyses covered two
types of the epoxy modules: of sphere- and elongated- shape, both with electrical penetrators
that enable electrical connection of the encapsulated components with external power
sources as well as other power modules and components. The tests were conducted
in a pressure chamber, with a maximum applied pressure of 310 bars, for which online
strain measurements have been conducted. The experimental results were compared with
the simulation results obtained with analytical and FEM models, providing validation of
the models employed. The experimental part of this work was conducted in collaboration
with Polish Naval Academy in Gdynia
Encapsulation of power electronics components for operation in harsh environments
This paper reports on analyses and testing of sensitive power electronics components
encapsulation concept, enabling operation in harsh, especially high pressure
environments. The paper describes development of the concept of epoxy modules that
can be used for protecting of the power electronics components against harsh environmental
conditions. It covers modeling of the protective capsules using a simple analytical
approach and Finite Element Method (FEM) models and validation of the developed
models with the high pressure tests on samples fabricated. The analyses covered two
types of the epoxy modules: of sphere- and elongated- shape, both with electrical penetrators
that enable electrical connection of the encapsulated components with external power
sources as well as other power modules and components. The tests were conducted
in a pressure chamber, with a maximum applied pressure of 310 bars, for which online
strain measurements have been conducted. The experimental results were compared with
the simulation results obtained with analytical and FEM models, providing validation of
the models employed. The experimental part of this work was conducted in collaboration
with Polish Naval Academy in Gdynia
Use of saccharose and structural polysaccharides from sugar beet biomass for bioethanol production
In addition to saccharose, sugar beet root contains
a lignocellulosic fraction, which is not used in the process of sugar
production and remains in sugar beet pulp. There is a great interest
in using the polysaccharides (cellulose, hemicellulose) present in
this raw material for the production of bioethanol. The objective
of this study was to assess the effect of the enzymatic treatment of
sugar beet biomass on the hydrolysis of the cellulose and hemicellulose
present in its cell walls, as well as its effect on the efficiency
of alcoholic fermentation of saccharose and sugars liberated from
structural polysaccharides. Its effect on the efficiency of the process
of inoculating the fermentation medium with a monoculture
or a co-culture of yeast strains fermenting hexose and pentose
sugars was also investigated. Our results reveal that in order to
enable the utilization of all fermentable sugars in the sugar beet
root biomass (saccharose as well as monosaccharides bound in
structural polysaccharides), initial enzymatic treatment should
be applied, followed by alcoholic fermentation using sequential
inoculation with a co-culture of Saccharomyces cerevisiae and
Pichia stipitis. These conditions ensure the utilization of hexoses
and pentoses (xylose) in alcoholic fermentation, thus enabling the
production of 9.9±0.4 kg of ethanol from 100 kg of sugar beet
biomass
Superconducting Electromagnets for Large Wind-Tunnel Magnetic Suspension and Balance Systems
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