1311. Thin-layer boilover of large-scale diesel pool fires at sub-atmospheric pressureJinlong Zhao, Qingyuan Zhang, Zhenqi Hu, Rongxue Kang, Grunde Jomaas, Rui Yang, 2024, original scientific article Abstract: As thin-layer burning of fuels on water are often followed by thin-layer boilover fires, particularly during the firefighting process, an experimental and numerical study was undertaken to address key aspects of such fires, especially in plateau areas (i.e., sub-atmospheric pressure). In the thin-layer boilover experiments at sub-atmospheric pressure (69 kPa), diesel was used as the fuel in five circular steel trays (ranging from 0.4 m to 1.2 m in diameter) and a square steel tray (side length of 2.5 m). The burning process, and especially the continuous boilover stage, was presented and the corresponding boilover intensity, time to boilover onset and boilover time interval were measured and analyzed. The results show that the flame height increased sharply at the initial boilover, while this increasing range gradually became weak for the subsequent boilovers. The initial boilover intensity showed a linear dependency on the fuel layer thickness at the time of boilover, and the slope of the boilover intensity line decreased with increasing pan area. Eventually, the effect of pan area on boilover intensity became limit. Moreover, a predictive model for the boilover intensity was established based on dimensionless analysis. The initial boilover onset time under the sub-atmospheric pressure was delayed compared with that under atmospheric pressure. The corresponding predictive correlation (for 69 kPa) with different diameter and fuel thickness was developed based on the one-dimension two-layer conduction model. In the end, the boilover time interval decreased with the boilover times, closing to uninterrupted boilover eventually. This work enriches the thin-layer boilover behavior experimental data at sub-atmospheric pressure and provides guidance for the fuel storage safety.
Keywords: thin-layer boilover, boilover intensity, time to boilover onset, boilover time interval, sub-atmospheric fires
Published in DiRROS: 16.01.2024; Views: 297; Downloads: 94
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1319. Clinical features as a predictor of laparotomy findings in supradiaphragmatic stage I and II Hodgkin's diseaseMarjeta Vovk, Tatjana Šumi-Križnik, M... Jenko-Fidler, Gabrijela Petrič-Grabnar, M... Kremžar, Janez Novak, Mojca Senčar, Branko Zakotnik, A... Vodnik-Cerar, B... Jakšić, 1995, original scientific article Keywords: Hodgkinova bolezen, rak (medicina), klinična slika
Published in DiRROS: 15.01.2024; Views: 273; Downloads: 73
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1320. Pisma Johanna Jacoba Ferberja : geološki opisi Slovenije iz druge polovice 18. stoletjaMihael Brenčič, 2023, review article Abstract: Obravnavana sta prevoda pisem Johanna Jacoba Ferberja (1743–1790), švedskega geologa in mineraloga, ki je septembra 1771 potoval preko Slovenije. Prvo pismo, naslovljeno na Ignaza von Borna, je bilo objavljeno v knjigi »Pisma iz Italije o naravnih čudesih te dežele, ki so bila poslana naslovniku Ignacu plemenitemu Bornu«, ki je izšla leta 1773 v Pragi, drugo pismo, poslano Giovanniju Arduinu, pa najdemo v knjigi »Zbirka razprav s področja kemije, mineralogije, metalurgije in oriktografije«, ki je izšla leta 1775 v Benetkah. Obe pismi vsebujeta razsvetljenski znanstveni opis geologije dela območja današnje Slovenije, ki temelji na takrat veljavnih geoloških teorijah. V članku smo podali kratke življenjepise akterjev, prevoda obeh pisem ter njun komentar in interpretacijo.
Keywords: mineralogija, razsvetljenska geologija, regionalna geologija, zgodovina geologije, Giovanni Arduino, Ignaz von Born
Published in DiRROS: 15.01.2024; Views: 363; Downloads: 92
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