31. KINETICS OF CELLULOSE DEGRADATION STUDIED USING SIZE EXCLUSION CHROMATOGRAPHYAneta Balažic Fabjan, 2016, master's thesis Abstract: For more than five centuries, paper has been the predominant carrier of information and numerous medieval manuscripts bear witness of its durability. However, increasing demand for paper led to several changes in its production in the 19th century. High quality rag fibres were replaced by inferior wood-originating ones. Acid manufacturing technology was introduced which, due to its simplicity and low cost, continued to be used until the end of the 20th century. Inherently stable paper rapidly degrades in the presence of acids and its decay is further promoted by the poor storage conditions and environmental pollutants. As a result, the amount of degraded paper in libraries, archives and museums is reaching enormous proportions. In order to prolong the usable time of the vast quantities of original materials, paper collections may be deacidified and/or stored at lower temperatures. While preservation options are known, lack of the competent comparative studies leaves collection keepers hesitant of their use. The introductory part of the project is focused on development of analytical methodologies and model materials, representative of historical acid paper. As uniqueness and inherent value of cellulose-based cultural heritage limits the use of analytical methodologies to the non-destructive or micro-destructive ones. A new methodology for determination of the condition of paper was developed. The analytical technique-size exclusion chromatography for the first time allows us to reproducible determine the condition of paper which contains a significant amount of wood derived lignin. A few fibres suffice for the analysis, which renders the methodology suitable for characterisation of historical materials. The results of the research will represent the effect of deacidification processes with use of micro destructive analytical methodologies. As written word is all what we have for our legacy from generation to generation, evaluating preservation strategies for decaying collections, safekeeping and long term access to the endangered written cultural heritage is one of the most important facts. Keywords: paper, size exclusion chromatography, kinetics, deacidification process Published in RUNG: 02.09.2016; Views: 6356; Downloads: 281 Full text (1,33 MB) |
32. Development of Slow Control Boards for the Large Size Telescopes of the Cherenkov Telescope ArrayDaniela Hadasch, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, published scientific conference contribution Keywords: Cherenkov Telescope Array (CTA), Large Size Telescopes (LST), imaging camera, slow control board (SCB) Published in RUNG: 21.03.2016; Views: 4347; Downloads: 195 Full text (4,05 MB) |
33. The Optical System for the Large Size Telescope of the Cherenkov Telescope ArrayM. Hayashida, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, published scientific conference contribution Keywords: Cherenkov Telescope Array (CTA), Large Size Telescopes (LST), optical system, active mirror control system Published in RUNG: 21.03.2016; Views: 4492; Downloads: 220 Full text (1,10 MB) |
34. The small size telescope projects for the Cherenkov Telescope ArrayTeresa Montaruli, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: Cherenkov Telescope Array (CTA), ASTRI, GCT, dual mirror Schwarzschild-Couder optics, SST-1M, Davies-Cotton design, CTA small size telescope (SST) projects Published in RUNG: 16.03.2016; Views: 4803; Downloads: 241 Full text (3,64 MB) |
35. Status of the Cherenkov Telescope Array's Large Size TelescopesJuan Cortina, Andrej Filipčič, Gašper Kukec Mezek, Samo Stanič, Serguei Vorobiov, Lili Yang, Gabrijela Zaharijas, Danilo Zavrtanik, Marko Zavrtanik, 2015, published scientific conference contribution Keywords: Cherenkov Telescope Array (CTA), Large Size Telescopes (LST), design requirements, element prototyping, installation and operation plans Published in RUNG: 16.03.2016; Views: 4213; Downloads: 223 Full text (5,17 MB) |
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