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Povzetek: This research was focused on the effect of Ti and S content on the formation of non-metallic inclusions and their influence on the mechanical properties and machinability of low-carbon ferritic– pearlitic steels. An analysis and classification of the non-metallic inclusions were carried out. The tensile strength and impact toughness were determined from samples taken in the rolling direction. Machinability investigations were carried out on a CNC turning machine and by analyzing the surface roughness. TiO-TiN inclusions are present in steels with an increased Ti content. In these steels, the hardness, tensile strength, and cutting forces increase with a higher proportion of Ti. In the second group of steels with increased contents of S, Al, and Ca, MnS and CaO-Al2O3-MnS non-metallic inclusions are formed. As the S content increases, the tensile strength and cutting forces decrease, while the impact toughness increases. In steels with added Ti, the This research was focused on the effect of Ti and S content on the formation of non-metallic inclusions and their influence on the mechanical properties and machinability of low-carbon ferritic– pearlitic steels. An analysis and classification of the non-metallic inclusions were carried out. The tensile strength and impact toughness were determined from samples taken in the rolling direction. Machinability investigations were carried out on a CNC turning machine and by analyzing the surface roughness. TiO-TiN inclusions are present in steels with an increased Ti content. In these steels, the hardness, tensile strength, and cutting forces increase with a higher proportion of Ti. In the second group of steels with increased contents of S, Al, and Ca, MnS and CaO-Al2O3-MnS non-metallic inclusions are formed. As the S content increases, the tensile strength and cutting forces decrease, while the impact toughness increases. In steels with added Ti, the machining is more difficult, but a finer surface is achieved after turning, while a higher S content results in an increased fraction of softer sulfide inclusions, which reduce the cutting forces but also result in a reduced surface quality. turning, while a higher S content results in an increased fraction of softer sulfide inclusions, which reduce the cutting forces but also result in a reduced surface quality.
Ključne besede: non-metallic inclusions, mechanical properties, machinability, surface roughness
Objavljeno v DiRROS: 03.09.2024; Ogledov: 248; Prenosov: 444
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Povzetek: Javno podjetje Okolje Piran, d.o.o je soočeno s fekalno onesnaženimi meteornimi vodami. Ta pojav je prisoten ob izrazitejših nalivih v vseh letnih časih, do izraza pa seveda pride v poletnem obdobju, ko so v Piranskem zalivu prisotni kopalci in se izvajajo številne druge rekreativne dejavnosti. Na predlog direktorja podjetja je enota Morske biološke postaje Nacionalnega inštituta za biologijo sestavila ta elaborat, ki je v pomoč pri sprejemanju odločitve, ali bi npr. s podmorskimi izpusti uspeli v zadostni meri zmanjšati onesnaženje (registriranih) kopališč zaradi onesnaženih meteornih voda. V obravnavi je predvsem del severne obale Piranskega zaliva, to je območje med vzhodno stranjo nekdanjega skladišča soli (pred poslopjem nekdanje uprave podjetja Droga) in kopališčem pred hotelom Emona kompleksa Bernardin). Smiselna je proučitev postavitev podmorskih prelivnih cevi na treh obrežnih lokacijah obstoječih izpustov meteornih voda. Cevi bi naj peljale onesnaženo meteorno vodo po morskem dnu (malo nad njim) dovolj daleč proč od obale. Po možnosti bi se naj cevi zaključite z difuzorjem. Slednji je lahko zelo enostavno izveden, lahko pomeni zgolj bočno navrtan poslednji del/segment izpustne cevi in zaprt konec cevi. Bočne odprtine, ki so navrtane izmenično na eni in drugi strani izpustne cevi, naj bodo bistveno manjše od premera cevi, a hkrati ne premajhne. Izkušnje in izračuni kažejo, da je za difuzor smiselno navrtati izpustno cev premera 0,5 – 0,6 m z odprtinami premera 0,1 m. Njihovo število in razmak se natančneje določijo s hidravličnim izračunom izpusta (Malačič, 2001), ki smo ga pred desetletji naredili za piranski komunalni izpust, pa tudi z oceno začetnega (inicialnega) redčenja (=mešanja) izpuščene vode z morsko vodo. Podobne izračune inicialnega redčenja smo pred desetletji naredili tudi za Koprski zaliv (Malačič in Potočnik, 1998; Malačič, 1999a; Malačič, 1999b), ko so bile proučevane možnosti za podmorski izpust odplak.
Ključne besede: poročila, morje, meteorna voda, onesnaženje, Piranski zaliv
Objavljeno v DiRROS: 03.09.2024; Ogledov: 194; Prenosov: 2777
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Povzetek: Prvi pojav hruševega ožiga pri nas je uradno zabeležen leta 2001. Prvi večji izbruh bolezni v Sloveniji je bil v letu 2003, ko se je hrušev ožig razširil po celotni Gorenjski in v okolici Maribora. Ob drugem večjem izbruhu, ki se je zgodil leta 2007, se je bolezen razširila tudi proti jugu in vzhodu države. Hrušev ožig se je ustalil na Gorenjskem, Koroškem, na območju Maribora in na Notranjskem. Kasneje sta bili iz varovanega (neokuženega) območja izločeni še občini Lendava ter Renče-Vogrsko (južno od avtoceste H4).
Ključne besede: hrušev ožig
Objavljeno v DiRROS: 03.09.2024; Ogledov: 210; Prenosov: 688
Celotno besedilo (3,92 MB)
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Povzetek: We prepared a list of methods and tests for validation in test performance study (TPS) Round 1, both for laboratory and on-site use, for 6 selected pests: Erwinia amylovora, Pantoea stewartiisubsp. stewartii, citrus tristeza virus, plum pox virus, Fusarium circinatum and Bursaphelenchus xylophilus. The listed tests were first validated in preliminary studies by TPS organizers in order to select the final tests for TPS, based on the scope and criteria prepared in D1.1.
Ključne besede: pests, tests
Objavljeno v DiRROS: 03.09.2024; Ogledov: 227; Prenosov: 118
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Povzetek: A list of general minimum criteria was developed to be used in preparation of reference materials to be used in interlaboratory testing, including validations through test performance studies. The list was based on previously identified criteria in standards including ISO standards, EPPO guidelines, deliverables of relevant projects, related fields, and own experience of project partners. Several additional criteria were proposed: ‘availability’, ‘purity’ and ‘commutability’. These criteria result from a series of discussions, taking into account previous work and relevant international standards. Where relevant, each criterion was first defined as a series of levels from the highest to lowest ranking with the lowest ranking considered to be the minimum. Depending on the intended use, the reference material may need to fulfil higher levels of selected criteria or some criteria may not be relevant at all. The criteria were tested by the organizers of the TPS in round 1 of validation within VALITEST project which include bacteria, viruses, nematodes and fungi. The systematic and structured approach of describing RMs was found to be useful in promoting transparent descriptions of the RMs used and comparability of TPSs, as well as a step toward implementing FAIR data principles. The criteria defined here are applicable, potentially with minor modification, beyond the scope of this deliverable and project to other pests and other uses of RMs
Ključne besede: pests, tests
Objavljeno v DiRROS: 03.09.2024; Ogledov: 208; Prenosov: 882
Celotno besedilo (1,99 MB)