1101. Ultra-high strenght TWIP steel with high chromium contentPavel Podaný, Tomáš Studecký, Tomas Gregor, Radek Prochazka, Aleksandra Kocijan, 2023, original scientific article Abstract: A new ultra-high strength steel with a fully austenitic microstructure and twinning-induced plasticity (TWIP) effect has been developed. TWIP effect gives this steel a good combination of high strength of over 1000 MPa and ductility of over 35%. This new steel has a high chromium content, which increases its corrosion resistance. By combining cold rolling and annealing, the steel has achieved a very fine austenitic microstructure with an average grain diameter of 2.85 µm. This steel could be used for structural applications or components that need to withstand high levels of stress, deformation and corrosion environment.
Keywords: TWIP steels, corrosion resistance, microstructure, tensile strength, plasticity
Published in DiRROS: 31.01.2024; Views: 326; Downloads: 192
 Full text (1,44 MB)
This document has many files! More... |
1102. |
1103. Poročilo o preskusu št.: LVG 2024-008 : vzorec št. 2023/00772Nikica Ogris, 2024, expertise, arbitration decision Keywords: varstvo gozdov, morfološke analize, navadna smreka, Picea abies, rdečenje smrekovih iglic, Lophodermium piceae, smrekov zavijač, Epinotia tedella, bolezen iglic
Published in DiRROS: 31.01.2024; Views: 286; Downloads: 109
Full text (1,12 MB) |
1104. |
1105. |
1106. Magnetic resonance spectroscopy: an overview of the method and its applicationin clinical neuroradiologyAleš Koren, 2002, original scientific article Abstract: Background. Magnetic resonance spectroscopy (MRS) is a comparatively new diagnostic method. Brain tissue is very suitable for MRS analysis. In practice, only a small number of compounds present in the brain may be analysed by MRS. The utility of MRS in neuroradiology and clinical practice isconstantly growing since the investigation is of help in the differential diagnosis of pathological processes as well as in assessing the progress of a disease and evaluating the outcome of treatment. In analysing the data obtained, a number of factors that may influence the objectivity of the resultmust be taken into account. The magnetic resonance scanner located at the Institute of Radiology, University Medical Centre Ljubljana, utilises modern MRS protocols and has proved a valuable tool in the diagnostic evaluation of neurologic diseases. Conclusions. MRS provides spectral analysisof substance in a selected volume of tissue, thereby offering an insight into the metabolic state of the tissue.
Published in DiRROS: 31.01.2024; Views: 243; Downloads: 58
Full text (110,16 KB) |
1107. Gastroparesis in a young diabetic patientPrimož Kovačič, Breda Jamar, 2002, original scientific article Abstract: Background. Gastroparesis is defined as a delay in emptying of contents from the stomach and occurs in a variety of conditions, e.g. after vagotomy or in systemic diseases such as diabetes mellitus, scleroderma and amyloidosis. The purpose of this paper is to present the radiologic examination, a simple, reliable and noninvasive method as an alternative to other methods for the assessment of gastric emptying. Case report. A twenty-one years old female wasadmitted because of suspected autonomic neuropathy. She had insulin dependent diabetes mellitus type 1 for the last ten years. At the time of admission she was complaining of nausea, vomiting weakness and occasional dizziness. A barium study of oesophagus and stomach was performed: oesophagus was dilated and aperistaltic, remnants of food were seen in aperistaltic stomach but no obstruction, causing delayed emptying, was found. Conclusions. Scintigraphy is at the present the standard technique for the assessment of gastric emptying. Ultrasonography, magnetic resonance imaging; electrogastrography, gastroduodenal manometry and emptying of radiopaque pellets are also used for the evaluation of gastric motility in cases of delayed gastric emptying. The role of barium studies remains to be established.
Published in DiRROS: 31.01.2024; Views: 233; Downloads: 62
Full text (79,86 KB) |
1108. Podroben pregled tokov lesa od gozda do sekundarne rabe lesaŠpela Ščap, Peter Prislan, 2023, treatise, preliminary study, study Keywords: gozdni lesni sortimenti, okrogli les, trg lesa, proizvodnja, gozdno-lesni sektor, zunanja trgovina, tokovi lesa, poraba lesa, les v gradbeništvu, pohištvena industrija
Published in DiRROS: 31.01.2024; Views: 372; Downloads: 0 |
1109. Ocena stanja lesnopredelovalnega sektorjaŠpela Ščap, Darja Stare, Martin Jež, 2023, treatise, preliminary study, study Keywords: gozdni lesni sortimenti, okrogli les, trg lesa, proizvodnja, gozdno-lesni sektor, politični ukrepi, zunanja trgovina, lesni proizvodi, napovedi tokov lesa, tokovi lesa, les za energetske namene, inovativni lesni proizvodi, trg lesnih proizvodov v Evropi, ogljik v lesnih izdelkih
Published in DiRROS: 31.01.2024; Views: 300; Downloads: 0 |
1110. Improving the surface properties of additive-manufactured Inconel 625 by plasma nitridingDanijela Anica Skobir Balantič, Črtomir Donik, Bojan Podgornik, Aleksandra Kocijan, Matjaž Godec, 2023, original scientific article Abstract: As a surface-hardening technique, plasma nitriding is a common procedure for improving the properties of
conventional Ni-based alloys. The diffusion of nitrogen hardens a layer on the surface of the alloy, leading to
better wear resistance and a higher coefficient of friction, as well as a higher surface hardness. This study reports
the effect of plasma nitriding on additive-manufactured (AM) Inconel 625 (IN625) compared to its conventional
manufactured and nitrided counterparts. The samples produced with the laser powder-bed fusion (LPBF) process
were subsequently plasma nitrided in the as-built condition, stress-relief annealed at 870 °C and solution treated
at 1050 °C. The plasma nitridings were carried out at 430 °C and 500 °C for 15 h. The growth kinetics of the
nitride layer of the AM samples depends on the prior heat treatments and is faster in the as-built state due to the
specific cellular structure. The lower nitriding temperature leads to the formation of expanded austenite in the
nitride layer, while at the higher nitriding temperature, the expanded austenite decomposes and CrN precipitation
occurs. The XRD and SEM analyses confirmed the presence of two layers: the surface layer and the
diffusion layer beneath. The lower nitriding temperature caused the formation of expanded austenite or a
combination of expanded austenite and CrN. The higher nitriding temperature led to the decomposition of the
expanded austenite and to the formation/precipitation of CrN. The higher nitriding temperature also decreased
the corrosion resistance slightly due to the increased number of precipitated Cr-nitrides. On the other hand, the
wear resistance was significantly improved after plasma nitriding and was much less influenced by the nitriding
temperature.
Keywords: additive manufacturing, powder-bed fusion, plasma nitriding, expanded austenite, wear and corrosion resistance, Ni-based alloy
Published in DiRROS: 31.01.2024; Views: 329; Downloads: 132
Full text (7,98 MB)
This document has many files! More... |
