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Abstract: Advances in physics have been significantly driven by state-of-the-art technology, and in photonics and X-ray science this calls for the ability to manipulate the characteristics of optical beams. Orbital angular momentum (OAM) beams hold substantial promise in various domains such as ultra-high-capacity optical communication, rotating body detection, optical tweezers, laser processing, super-resolution imaging etc. Hence, the advancement of OAM beam-generation technology and the enhancement of its technical proficiency and characterization capabilities are of paramount importance. These endeavours will not only facilitate the use of OAM beams in the aforementioned sectors but also extend the scope of applications in diverse fields related to OAM beams. At the FERMI Free-Electron Laser (Trieste, Italy), OAM beams are generated either by tailoring the emission process on the undulator side or, in most cases, by coupling a spiral zone plate (SZP) in tandem with the refocusing Kirkpatrick–Baez active optic system (KAOS). To provide a robust and reproducible workflow to users, a Hartmann wavefront sensor (WFS) is used for both optics tuning and beam characterization. KAOS is capable of delivering both tightly focused and broad spots, with independent control over vertical and horizontal magnification. This study explores a novel non-conventional `near collimation' operational mode aimed at generating beams with OAM that employs the use of a lithographically manufactured SZP to achieve this goal. The article evaluates the mirror's performance through Hartmann wavefront sensing, offers a discussion of data analysis methodologies, and provides a quantitative analysis of these results with ptychographic reconstructions.
Keywords: tailored photonics beams, orbital angular momentum of light, wavefront sensing, ptychography
Published in RUNG: 19.08.2024; Views: 724; Downloads: 4
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Abstract: In our graduation seminar, we studied the effects of extended maceration of grape mash on polyphenol extraction in white wine production. Data from the literature show that grape variety plays an important role in the influence of the skin contact procedure on the extraction of phenolics. The polyphenol content of Chardonnay was improved by 24-hour cryomaceration of the mash at 8.0°C and 6.0°C, whereas no such effect was observed at 4.0°C. In the case of Malvasia, the maximum amount of caftaric and caffeic acid was obtained after 21 days of post-fermentation maceration at 16.0°C. These findings underscore the potential of controlled maceration to enrich white wines with greater complexity and antioxidant capacity. However, polyphenols are very susceptible to oxidation, especially during the initial stage of grape processing, leading to the formation of brown pigments and an amber color in such wines, which may also occur during the aging process if the phenolic-rich white wine is not sufficiently protected by other antioxidants. The changes in phenolics during prolonged maceration or aging of vintage white wines are not yet well understood. Further research is needed to elucidate the chemical reactions and transformations of polyphenols during prolonged skin contact and aging in order to develop targeted approaches to produce high-quality white wines with prolonged maceration of the mash with desirable sensory and health-promoting properties.
Keywords: polyphenols, white wine, skin contact, winemaking procedures
Published in RUNG: 19.08.2024; Views: 628; Downloads: 0
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Keywords: biosensors, chronic diseases, biomarkers
Published in RUNG: 14.08.2024; Views: 706; Downloads: 0
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Abstract: This paper explores the presence and integration of postcolonial studies in literature education within the faculties of philology in the capitals of the former Yugoslav countries. Focusing on the emerging field of critical curriculum studies, the research delves into the nuanced landscape of literature education, particularly at higher levels, specifically emphasizing literary students’ specialized education. The study contextualizes postcolonial studies as a hybrid space for theoretical discourse, tracing its roots to anticolonial critique and contemporary Western theories. Drawing on the anticolonial heritage of socialist Yugoslavia and its involvement in the Non-Aligned Movement, the paper navigates the complexities of (post)colonial dynamics in the Balkans. This paper investigates the presence, or absence, of postcolonial theory in literature curricula within humanities faculties in the former Yugoslav countries’ capital cities. This research is based on the close interconnection of literature and postcolonial theory, whose origins lie within the literary representation of colonization relations. The primary objective is to discern the extent to which postcolonial studies are integrated into literary education and what implications this holds within the national context. Through an examination of course programs and content at various academic levels, the research aims to illuminate the role of postcolonial theory in shaping the narrative of literature education in the context of the former Yugoslavia.
Keywords: postcolonial theory, curriculum, literary education, former Yugoslavia, higher education
Published in RUNG: 13.08.2024; Views: 796; Downloads: 10
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Abstract: Predavanje o tehnologiji pridelave vina z manjšo vsebnostjo alkohola ali brez alkohola
Keywords: predavanje, vina brez alkohola, tehnologija pridelave
Published in RUNG: 12.08.2024; Views: 661; Downloads: 0
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