21. Hydrogeological characterization of karst springs of the white (Proteus anguinus anguinus) and black olm (Proteus anguinus parkelj) habitat in Bela krajina (SE Slovenia)Katja Koren, Rok Brajkovič, 2023, original scientific article Abstract: The springs west of Črnomelj, in SE Slovenia, are the habitat of the black (Proteus anguinus parkelj) and the white olm (Proteus anguinus anguinus). Some of these springs are also the only known habitat in the world of endemic species of black olm. A steady decline in olm populations has been observed in this area over the past decades. Owing to the rapid runoff and groundwater flow high-resolution monitoring is essential in providing better insight into the hydrogeological characterization of the catchment area of springs. Specific factors and critical parameters of water behind said olm degradation have not yet been defined. Because the olm’s environment is largely aquatic, one potential critical parameter could be the higher water temperatures (>12 °C) or higher nitrate concentration (>9.2mg/l). The six-month observation of the springs (July – December 2021) point to water temperature as a potential critical parameter since the water temperature of the springs exceeded 12 °C in months July and August. Nitrate concentrations could also be a second critical parameter in the degradation of the olm’s habitat. Maximum nitrate concentrations above 9.2mg/l throughout much of the observation period (except for Dobličica spring). Due to less agricultural activity in December in the spring catchment area and a higher dilution rate due to reduced evapotranspiration and increased effective precipitation during this time of the year, the nitrate concentrations are decreased. The results of the measured parameters of groundwater could show the hydrogeological connection between the Otovski and Pački breg springs and between Šotor, Jamnice and Dobličica. The Obršec spring has an independent catchment area. A detailed estimation of the springs catchment area is possible due to a detailed geologic map. It is necessary to determine the origin of the nitrate (nitrate isotope analysis), to quantify the threshold values of the critical parameters, to define precisely all the causes of the olm deterioration, and to make proposals for appropriate measures to limit or even stop the decline of the olm population.
Keywords: hydrogeology, olm, ecology, nitrate, monitoring
Published in DiRROS: 16.01.2024; Views: 152; Downloads: 55
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22. Microfossils from Middle Triassic beds near Mišji Dol, central SloveniaKatja Oselj, Tea Kolar-Jurkovšek, Bogdan Jurkovšek, Luka Gale, 2023, original scientific article Abstract: Middle Triassic beds exposed along the road between Mišji Dol and Poljane pri Primskovem (Posavje Hills) comprise marlstone, tuff, volcaniclastic sandstone, and thin- to medium-bedded limestone and dolostone. The succession was logged and sampled for conodonts. A relatively rich conodont assemblage was determined, consisting of Budurovignathus gabrielae Kozur, Budurovignathus sp., Cratognathodus kochi (Huckriede), Gladigondolella malayensis Nogami, Gladigondolella tethydis Huckriede, Gladigondolella sp., Neogondolella balkanica Budurov & Stefanov, Neogondolella cf. excentrica Budurov & Stefanov, Neogondolella constricta (Mosher & Clark), Neogondolella cornuta Budurov & Stefanov,Neogondolella sp., Paragondolella excelsa Mosher, Paragondolella liebermani (Kovacs & Kozur), Paragondolella trammeri (K o z u r), Paragondolella cf. alpina (Kozur & Mostler), and Paragondolella sp. The assemblage correlates with the upper Anisian and lowermost Ladinian assemblages from the Global Boundary Stratotype Section and Point (GSSP) of the Ladinian at Bagolino in the Southern Alps in northern Italy. Along with conodonts, numerous specimens of benthic foraminifera Nodobacularia? vujisici Urošević & Gaździcki were recovered from the lowermost part of the succession. Previous research on this taxon is critically evaluated.
Keywords: Dinarides, Sava Folds, Middle Triassic, upper Anisian, lower Ladinian, basin, volcaniclastics, conodonts, foraminifera
Published in DiRROS: 15.01.2024; Views: 143; Downloads: 49
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26. Influence of homogenization of alkali-activated slurry on mechanical strengthBarbara Horvat, Mark Češnovar, Katja Traven, Majda Pavlin, Katja Koenig, Vilma Ducman, 2022, published scientific conference contribution Abstract: Alkali-activated materials are promising materials for the construction industry due to the accessibility of the precursors, which are mainly secondary industrial by-products, and their cost- effective and energy-efficient production. Although these materials are not new, some of the parameters in the technological process are not yet fully understood and tested. Therefore, in this paper in the means of mechanical strength, the preparation of alkali-activated pastes by using a three-roll mill homogenization method is discussed. The influence of homogenization of alkali- activated slurry has been evaluated on different waste materials (fly ash, fly ash with metakaolin, slag mixture (electric arc furnace slag and ladle slag), glass wool, waste green ceramics), which are treated with different alkali activators (NaOH, commercial sodium silicate solution, laboratory-produced alkali activators based on waste cathode- ray tube glass) with different curing regimes (60 °C and 70 °C) and different drying methods (drying at room temperature, drying at 105 °C). The viscosity of the slurry before homogenization was higher than after homogenization, the distribution of elements was more uniform and the compressive strength higher in all homogenized alkali activated materials, regardless of other parameters.
Keywords: secondary raw material, alkali activated material, foaming, homogenization, mechanical strength
Published in DiRROS: 21.12.2023; Views: 227; Downloads: 74
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27. Merjeni in izračunani fotobiološki učinki odbite svetlobe na ljudiKatja Malovrh Rebec, 2018, original scientific article Abstract: Pri načrtovanju osvetlitve izračuni le delno napovejo vplive svetlobe na uporabnike prostorov. Svetloba ima namreč poleg dobro poznanih slikovnih učinkov, ki jih možgani interpretirajo na podlagi odzivov čepkov in paličic, tudi neslikovne učinke. Ti ne pripomorejo k orientaciji v prostoru, temveč sporočajo telesu ključne informacije, ki vplivajo na tvorbo hormonov. Vrh te zaznave je v modrem delu spektra vidne svetlobe. Žal delovanja teh fotoreceptorjev še ne opisujemo s parametri, ustaljenimi v praksi projektiranja, zato so vplivi na uporabnike pogosto prezrti. Dodaten izziv pomeni praksa, pri kateri svetlobne učinke preračunavamo v lukse, kar pomeni, da jih množimo s povprečnim človeškim dnevnim vidom. Tak pristop ni primeren za vrednotenje neslikovnih učinkov, ker imajo drugo akcijsko krivuljo. Izmerili smo spektralno sestavo odbitih dnevnih svetlob v modelnem prostoru, ker nas je zanimalo, kakšne razlike nastanejo v slikovni in neslikovni zaznavi, če pobarvamo stene z različnimi barvami. Modra in vijoličasta stena neslikovno stimulirata opazovalca bolj kot slikovno v obeh opazovanih smereh pogleda, oranžna v obeh primerih neslikovno vpliva manj, pri zeleni pa je bila neslikovna zaznava bolj stimulirana od slikovne pri pogledu naprej, pri pogledu v mizo pa je bilo obratno.
Keywords: svetloba, fotobiološki vpliv, spektralna sestava svetlobe, dnevna svetloba
Published in DiRROS: 21.12.2023; Views: 189; Downloads: 64
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28. Pathway toward sustainable winter road maintenance (case study)Katja Malovrh Rebec, Janez Turk, 2023, independent scientific component part or a chapter in a monograph Abstract: Life Cycle Assessment (LCA) method was applied to evaluate the environmental impacts of winter road maintenance managed by an innovative road-weather information system and the impacts of vehicles passing the road during the snowstorm event. A case study refers to 10-hour lasting snowstorm event, considering a specific road section and application of a road-weather information management system to help winter road maintenance agency optimizing activities (salt gritting and/or plowing). Reliable information on the timing of the beginning of the snowstorm event affects (1) the activities of winter road maintenance, (2) the mobility of all vehicles passing the road, and (3) the fuel consumption of the vehicles. Since activities are optimized in case of preventive operation of winter road maintenance, less salt is needed overall. The road remains free of snow cover in case of preventive winter road maintenance operation, meaning that passenger cars and trucks pass the road at normal speed, without undesirable acceleration and braking caused by wheels slipping if snow accumulates on the road. Fuel consumption of vehicles passing salted and snow-free road remains unchanged, while fuel consumption increases in case of snow cover. Reduction of environmental burdens in case of such optimized winter road maintenance operation, is shown in this case study. The overall results of the comparative LCA analysis showed that the use of the road-weather information system in road traffic allows for as much as 25% reduction of environmental footprints. In the scenario where the winter service does not use information system the winter service also uses 40% more salt, which is also related with additional environmental impacts.
Keywords: LCA, okoljski odtisi, cesta, snežne razmere, preventivno delovanje, promet, poraba goriva, varnost, LCA, environmental impacts, road, snow cover, preventive operation, traffic, fuel consumption, safety
Published in DiRROS: 11.12.2023; Views: 166; Downloads: 104
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29. Pozicioniranje in kontrola kakovosti mamogramaZvonko Krajnc, Miljeva Rener, Alenka Rataj, Patricija Rusjan, Gregor Novak, Katja Čebulj, 2004, published scientific conference contribution Abstract: Izhodišča. Pravilno pozicioniranje je predpogoj za zagotavljanje kakovosti mamografskih slik. Zato je pomembno, da dobro poznamo anatomijo in tehnike pozicioniranja, slikanja in razvijanja. Zaključki. Da bi dosegli optimalen prikaz tkiv, rnorarno pravilno nastaviti nosilec kasete in kompresorij ter izkoristiti premakljivost dojk, pomembna pa je tudi pravilna uporaba aparatur.Ob izvajanju mamografije moramo nujno upoštevati kriterije za kontrolo kakovosti. Pri tem nam pomaga pravilnik o pogojih, ki jih morajo izpolnjevati primarni centri za dojke v Republiki Sloveniji, ter evropske smernice. S kontrolo kakovosti bomo u Sloveniji zvišali kvaliteto in s tem prispevali k čirn zgodnejšemu odkrivanju sprememb na dojkah.
Published in DiRROS: 01.12.2023; Views: 210; Downloads: 51
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