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Discovering unknown Madagascar biodiversity : integrative taxonomy of raft spiders (Pisauridae: Dolomedes)
Kuang-Ping Yu, Matjaž Kuntner, 2024, original scientific article

Abstract: Madagascar is a global biodiversity hotspot, but its biodiversity continues to be underestimated and understudied. Of raft spiders, genus Dolomedes Latreille, 1804, literature only reports two species on Madagascar. Our single expedition to humid forests of eastern and northern Madagascar, however, yielded a series of Dolomedes exemplars representing both sexes of five morphospecies. To avoid only using morphological diagnostics, we devised and tested an integrative taxonomic model for Dolomedes based on the unified species concept. The model first determines morphospecies within a morphometrics framework, then tests their validity via species delimitation using COI. It then incorporates habitat preferences, geological barriers, and dispersal related traits to form hypotheses about gene flow limitations. Our results reveal four new Dolomedes species that we describe from both sexes as Dolomedes gregoric sp. nov., D. bedjanic sp. nov., D. hydatostella sp. nov., and D. rotundus sp. nov. The range of D. kalanoro Silva & Griswold, 2013, now also known from both sexes, is expanded to eastern Madagascar. By increasing the known raft spider diversity from one valid species to five, our results merely scratch the surface of the true Dolomedes species diversity on Madagascar. Our integrative taxonomic model provides the framework for future revisions of raft spiders anywhere.
Keywords: raft spiders, integrative taxonomic model, Madagascar, biodiversity, integrative taxonomy, zoology
Published in DiRROS: 16.05.2024; Views: 100; Downloads: 99
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Influence of casting defects on damage evolution and potential failures in hot rolling simulation system
Umut Hanoglu, Božidar Šarler, 2023, original scientific article

Keywords: simulation, rolling, steel, slice model, meshless, radial basis functions, damage
Published in DiRROS: 18.04.2024; Views: 131; Downloads: 60
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Kartiranje in vrednotenje ekosistemskih storitev na Jelovici : projekt JeloviZa
Anže Japelj, 2023, treatise, preliminary study, study

Keywords: ekosistemske storitve, vrednotenje, kartiranje, Jelovica, kaskadni model
Published in DiRROS: 26.01.2024; Views: 275; Downloads: 0

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LCA and LCC assessment of UHPFRC application for railway steel bridge strengthening
Irina Stipanović, Sandra Škarić Palić, Aljoša Šajna, Martín-Sanz Henar, Eleni Chatzi, 2021, published scientific conference contribution

Abstract: Most of the existing railway steel bridges are nowadays older than 70 years, experiencing serious aging and overload problems. Therefore they either need to be replaced or strengthened to fulfil the increased requirements. The main idea of strengthening existing steel bridges is considering the possibility of adding load bearing deck above the main girders without replacing them. In this particular case study, the original steel structure of the 9m long railway bridge was dismantled and transported to the laboratory for the experimental assessment and development of the new rehabilitation method. Based on the assessment results, a strengthening slab was designed using Ultra High Performance Fibre Reinforced Concrete (UHPFRC) formula. In the life cycle analysis, using LCC and LCA models, the comparison of the application of UHPFRC cast in-situ deck is compared to the bridge replacement solution, which was actually selected method by the owner. The executed solution used also a temporary bridge in order to enable continuous traffic, which has caused very high construction costs. In order to compare different options, we have additionally analysed a solution without a temporary bridge, which created three life cycle scenarios. Most important steps during the construction, exploitation and end-of-life stage have been taken into account and integrated into the LCA and LCC models. Finally the environmental, economy and societal impacts of three solutions were compared over the period of 60 years. The rehabilitation option with UHPFRC deck has shown by far the lowest direct and environmental cost while the user delay costs only after the period of 50 years are not the most convenient for users. Superior characteristics of UHPFRC enabled the optimization of the load bearing deck and by that a very low total used quantity of material resulting in minimum direct and indirect costs.
Keywords: railway steel bridge, UHPFRC, strengthening, LCA, LCC model
Published in DiRROS: 25.01.2024; Views: 208; Downloads: 136
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