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Št. zadetkov: 8
OPTICAL MODELLING AND OPTIMIZATION OF SOLAR CELLS WITH NANO- AND MICROPHOTONIC STRUCTURES BASED ON RIGOROUS COUPLED WAVE ANALYSIS
ŽIGA LOKAR, Janez Krč
Doktorska disertacija
Oznake: Optical modelling;photovoltaics;silicon heterojunction solar cells;RCWA;CMA;
This thesis is focused on the optical simulations of the silicon heterojunction (Si HJ) solar cells. A model based on Rigorous Coupled Wave Analysis (RCWA) was developed and integrated in the so-called Coupled Modelling Approach (CMA). The Si HJ structure consists of a thick crystalline silicon wafe ...
Leto: 2019 Vir: Fakulteta za elektrotehniko (UL FE)
Cavitation bubble dynamics in a vicinity of a thin membrane wetted by different fluids
Žiga Lokar, Rok Petkovšek, Matevž Dular
Izvirni znanstveni članek
Oznake: kavitacija;membrana;vizualizacija;cavitation;membrane;visualization;
Understanding and controlling the interaction of cavitation bubbles and nearby material is becoming essential optimization of various processes. We examined the interaction of a single bubble with a membrane with different fluids on each side of it. Significant differences in bubble behavior dependi ...
Leto: 2021 Vir: Fakulteta za strojništvo (UL FS)
Laser induced microbubbles as an alternative driver for liquid pumping
Vid Agrež, Žiga Lokar, Rok Petkovšek
Izvirni znanstveni članek
Oznake: laser induced cavitation;micro pumping;rigid boundary;bubble dynamics;
The laser- induced cavitation bubble, which collapses near a rigid boundary with a hole on a microscale is investigated for liquid pumping applications. The generated bubble and the hole have a comparable size on a scale of 100 μm. The dynamics of the process are visually tracked near the hole and t ...
Leto: 2024 Vir: Fakulteta za strojništvo (UL FS)
Localized measurement of a sub-nanosecond shockwave pressure rise time
Jaka Petelin, Žiga Lokar, Darja Horvat, Rok Petkovšek
Izvirni znanstveni članek
Oznake: optical fiber sensors;pressure measurement;measurement by laser beam;electric breakdown;sonar equipment;fiber lasers;optical fibers;fiber optic probe hydrophone;pressure;shockwave;
In a growing number of applications fast and localized pressure measurement in aqueous media is desired. To perform such measurements a custom made single-mode fiber optic probe hydrophone (FOPH) was designed and used to measure the pressure pulse generated by laser induced breakdown in water. The s ...
Leto: 2022 Vir: Fakulteta za strojništvo (UL FS)
Ultrafast measurement of laser-induced shock waves
Žiga Lokar, Darja Horvat, Jaka Petelin, Rok Petkovšek
Izvirni znanstveni članek
Oznake: lasersko povzročen udarni val;čas naraščanja udarnega vala;hidrofon z optičnim vlaknom;viskoznost;laser-induced shockwave;shockwave rise time;fiber optic hydrophone;viscosity;
We present measurements of laser-induced shockwave pressure rise time in liquids on a sub-nanosecond scale, using custom-designed single-mode fiber optic hydrophone. The measurements are aimed at the study of the shockwave generation process, helping to improve the effectiveness of various applicati ...
Leto: 2023 Vir: Fakulteta za strojništvo (UL FS)
Experimental evaluation of methodologies for single transient cavitation bubble generation in liquids
Darjan Podbevšek, Žiga Lokar, Jure Podobnikar, Rok Petkovšek, Matevž Dular
Izvirni znanstveni članek
Oznake: cavitation;bubbles;lasers;
Single bubble dynamics are of fundamental importance for understanding the underlying mechanisms in liquid-vapor transition phenomenon known as cavitation. In the past years, numerous studies were published and results were extrapolated from one technique to another and further on to "real-world" ca ...
Leto: 2021 Vir: Fakulteta za strojništvo (UL FS)
Multi-frame multi-exposure shock wave imaging and pressure measurements
Jaka Mur, Fabian Reuter, Jernej Jan Kočica, Žiga Lokar, Jaka Petelin, Vid Agrež, Claus-Dieter Ohl, Rok Petkovšek
Izvirni znanstveni članek
Oznake: cavitation;laser breakdown;shock wave;laser illumination;fiber-optic hydrophone;
Shock wave visual detection was traditionally performed using streak cameras, limited to homogeneous shock wave emission, with the corresponding shock wave pressure measurements available at rather large distances or numerically estimated through equation of state for water. We demonstrate a multi-f ...
Leto: 2022 Vir: Fakulteta za strojništvo (UL FS)
Odziv ličink dvopike polonice (Adalia bipunctata [L.] in navadne tenčičarice (Chrysoperla carnea Stephens) na izbrane kemične snovi, ki jih izločajo nadzemni deli breskve (Prunus persica [L.] Batsch)
Nika Lokar, Žiga Laznik
Magistrsko delo
Oznake: hlapljive organske snovi;Adalia bipunctata;Chrysoperla carnea;biotično varstvo;
Med prehranjevanjem žuželke na rastlini imata tako žuželka, kot tudi rastlina, sposobnost izločanja hlapljivih organskih snovi (HOS). V predhodnji študiji so raziskovalci ugotovili, da listi breskve ob prisotnosti sive breskove uši začnejo izločati HOS. Namen naše raziskave je bil ugotoviti ali te s ...
Leto: 2018 Vir: Biotehniška fakulteta (UL BF)
Št. zadetkov: 8
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