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1502. Application of beam deflection spectrometry for the determination of iron species in passive samplers exposed to Southern Ocean ice : poster at International School of Quantum Electronics, 64th Course: Progress in Photoacoustic & Photothermal Phenomena, Erice - Sicily, October 16th-23rd, 2021Hanna Budasheva, Arne Bratkič, Martin Šala, Dorota Korte, Mladen Franko, 2021, unpublished conference contribution Published in RUNG: 02.12.2021; Views: 1736; Downloads: 34
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1504. Towards a novel method for iron species determination in Antarctic sea iceHanna Budasheva, Arne Bratkič, Dorota Korte, Mladen Franko, 2021, published scientific conference contribution abstract Abstract: Sea-ice borne iron has been found to be an important factor controlling Southern Ocean phytoplankton growth [1]. Knowing the amount and chemical speciation of its labile fraction in sea ice would advance our understanding of the involved processes. Unfortunately, it is rather difficult to perform their measurement because of limited access to the Antarctic. Thus there is a strong need for the development of a quick, simple and reliable technique for determination of iron and its speciation in sea-ice that ensures also low enough limits of detection. Recently, diffusive gradients in thin films (DGT) have been widely used as passive samplers for collecting time-averaged data on the concentrations of transition metals in different media [2]. DGTs are further coupled to an analytical technique that in case of detecting metals in passive sampler films primarily requires their extraction [3], which may potentially lead to changes of the metal specification. In the present study, the beam deflection spectrometry (BDS) is coupled to DGT and used to determine the average concentration of iron in the sea ice samples collected at the Davis Station in the Antarctic. Such a combined technique has been already successfully applied for detecting labile iron species in freshwater sediments [4]. The obtained BDS data were validated by thermal lens spectrometry (TLS) and UV-Vis spectrophotometry (SPEC). The distribution of iron species over a given ice surface area using the DGT-BDS technique revealed total iron concentrations in the range of 0.6 – 5.3 μgL-1, whereas the Fe2+ content was found to be in the range of 0.1 – 1.5 μgL-1. The range taking into account all of the measurement points (5×4), the precision of a single measured point is 0.2 μgL-1. The calculated 24 h-average concentration of total Fe labile species in the ice by using BDS is 2.3 ± 0.5 μgL-1, which coincides with data obtained by SPEC (2.5 ± 0.4 μgL-1) and TLS (2.39 ± 0.02 μgL-1). Our results indicate that it is possible to develop a robust, contamination-resilient detection method for measuring the labile iron species concentration in the sea ice. In opposite to TLS and SPEC, BDS-DGT provides reliable information not only about the speciation of iron but also about their distribution on the ice surface.
Keywords: beam deflection spectrometry, diffusive gradients, thin films, iron species, photothermal techniques, Antarctic sea ice
Published in RUNG: 30.11.2021; Views: 2297; Downloads: 0
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1505. Through-plane and in-plane thermal diffusivity determination of graphene nanoplatelets by photothermal beam deflection spectrometryHumberto Cabrera, Dorota Korte, Hanna Budasheva, Behnaz Abbasgholi N. Asbaghi, Stefano Bellucci, 2021, original scientific article Abstract: In this work, in-plane and through-plane thermal diffusivities and conductivities of a freestanding
sheet of graphene nanoplatelets are determined using photothermal beam deflection spectrometry.
Two experimental methods were employed in order to observe the effect of load pressures
on the thermal diffusivity and conductivity of the materials. The in-plane thermal diffusivity was
determined by the use of a slope method supported by a new theoretical model, whereas the
through-plane thermal diffusivity was determined by a frequency scan method in which the obtained
data were processed with a specifically developed least-squares data processing algorithm.
On the basis of the determined values, the in-plane and through-plane thermal conductivities and
their dependences on the values of thermal diffusivity were found. The results show a significant
difference in the character of thermal parameter dependence between the two methods. In the case
of the in-plane configuration of the experimental setup, the thermal conductivity decreases with the
increase in thermal diffusivity, whereas with the through-plane variant, the thermal conductivity
increases with an increase in thermal diffusivity for the whole range of the loading pressure used.
This behavior is due to the dependence of heat propagation on changes introduced in the graphene
nano-platelets structure by compression.
Keywords: graphene nanoplatelets, thermal diffusivity, thermal conductivity, photothermal spectrometry
Published in RUNG: 30.11.2021; Views: 1851; Downloads: 66
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1506. Alojz Gradnik e le terre di confineAna Toroš, 2021, published scientific conference contribution abstract Abstract: V pričujočem priskevku bomo osvetlili pot Alojza Gradnika (1882–1967), pesnika in prevajalca na stičišču jezikov in kultur. Alojz Gradnik se je rodil v Goriških Brdih, ki so danes od Gorice ločena z državno mejo med Slovenijo in Italijo. V času Gradnikove mladosti je bilo to območje pod Avstro-Ogrskim okvirom. Gradnik je tako končal nemško gimnazijo v Gorici in študij prava na Dunaju. Njegov izobraževalni proces je potekal v nemščini. Druače je bilo v njegovem intimnem, domačem okolju. Gradnik se je rodil v narodnostno mešani družini, materi Furlanki in očetu Slovencu. Ker sorodnikov po očetovi strani ni poznal, je bil zelo navezan na furlanske sorodnike. Posledično se je že v otroških letih naučil furlanščine. Posebej močne vezi so se spletle med njim in njegovo sestrično po materini strani, Mario Samer, živečo v Trstu. S slednjo si je Gradnik intenzivno dopisoval v 30. letih prejšnjega stoletja, v času njegovega bivanja v Zagrebu, kjer je deloval kot eden od vrhovnih sodnikov tedanje Jugoslavije. Maria Samer mu je med drugim pomagala pri zbiranju gradiva za njegovo prevajalsko delo in prevajala njegove pesmi v italijanščino. Gradnik je namreč začel že kot študent, v letih pred razpadom Avstro-Ogrske, razmišljati o svoji medkulturni poziciji, med slovanskim in romanskim svetom, o njegovi dvojni kulturni dediščini. Posebej ga je navidhnil roman Heinricha Manna (1871–1950) Zwishen den Rassen (1907), ki govori o razpetosti glavne junakinje med romanskim in germanskim svetom. Na tej osnovi je nastal njegov sonet Vprašanje, vključen v njegovo zbirko De profundis (1926), v kateri se sprašuje o njegovi vmesni poziciji med slovanskim in romanskim svetom. Gradnik, kot obmejni človek, je želel stkati vezi med jeziki in kulturami, tako da je vse do jeseni njegovega življenja, poleg naporne službe sodnika, bogatega pesniškega opusa, prevajal številna dela in svetovne literarne zakladnice. V okviru obmejnosti gre omeniti njegovo antologijo Italijanske lirike (1940), pa tudi njegove prevode iz furlanske poezije. Kot človek na stičišču jezikov in kultur je našel mesto tako v slovenski kot v furlanski in italijanski literarni zgodovini in bil preveden v italijanščino in furlanščino. Gradnik je bil globoko zakoreninjen v njegov rodni, obmejni prostor, kar je pesniško izrazil v verzih iz pesmi Pojoča kri (1944). Sklenemo lahko z ugotovitvijo Otona Župančiča, pesnika slovenske moderne, Gradnikovega sodobnika, da je ključ do razumevanja posebnosti Gradnikove poezije ravno v njegovi medkulturni poziciji.
Keywords: Aljz Gradnik, večkulturnost, večjezičnost
Published in RUNG: 29.11.2021; Views: 1519; Downloads: 99
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1509. Alojz Gradnik in češka literaturaAna Toroš, 2021, independent scientific component part or a chapter in a monograph Abstract: Gradnikovi stiki s češkim literarnim prostorom se delijo na dve obdobji, 1905–1918 ter obdobje tridesetih let. Medkulturne povezave se odpirajo v relaciji med Gradnikom in O. Berkopcem in Gabrielo Preissovo. Objavljeni Gradnikovi prevodi v češčini so večinoma vzeti iz Gradnikove zbirke Padajoče zvezde (1916) in večinoma pokrivajo bivanjsko tematiko. Gradnikova pesniška zbirka v češčini ni izšla.
Na podlagi novo odkritih virov lahko domnevamo, da je Gradnik načrtoval prevajanje sodobne češke poezije.
Keywords: literarna recepcija, prevodi
Published in RUNG: 25.11.2021; Views: 1535; Downloads: 0
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