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15. Radioimunološko določanje luteinizirajočega hormona (LH), folikel stimulirajočega hormona (FSH) in testosterona v krvi in spermi fertilnih in infertilnih moškihElko Borko, Radovan Breznik, Ksenija Ogrizek-Pelkič, Majda Rižnik, Jurij Šubic, Rudi Turk, 1978, original scientific article Abstract: Avtorji poročajo o svojih izkušnjah z določanjem LH, FSH in testosterona v krvi in v spermi pri fertilnih in infertilnih moških. Naše dosedanje preiskave so pokazale, da je količina FSH v krvi v primeru okvarjene spermatogeneze povečana. Vrednosti LH so v spermi višje kot statistično signifikantne korelacije glede na spermatogenezo. Avtorji načrtujejo nadaljne raziskave o gibanju teh hormonov v krvi in spermi pri različnih oblikah okvarjene sprematogeneze.
Published in DiRROS: 14.09.2023; Views: 194; Downloads: 64
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16. Effect of deep cryogenic treatment on corrosion properties of various high-speed steelsJure Voglar, Živa Novak, Patricia Jovičević Klug, Bojan Podgornik, Tadeja Kosec, 2021, original scientific article Abstract: The aim of the study was to evaluate the corrosion properties of three different grades of high-speed steel following a heat treatment procedure involving deep cryogenic treatment after quenching and to investigate how these properties are connected to the microstructure and hard- ness of the material. The hardness of steels was measured, and microstructural properties were determined through observation of the metallographically prepared steels using scanning electron microscopy. These studies were complemented corrosion evaluation by the use of corrosion potential measurement and linear polarization measurement of steels in a sodium tetraborate buffer at pH 10. The results showed that the deep cryogenic procedure of high-speed steel changed the microstructure and consequently affected the hardness of the investigated steels to different extents, depending on their chemical composition. Corrosion studies have confirmed that some high-speed steels have improved corrosion properties after deep cryogenic treatment. The most important improvement in corrosion resistance was observed for deep cryogenically treated high-speed steel EN 1.3395 (M3:2) by 31% when hardened to high hardness values and by 116% under lower hardness conditions. The test procedure for differentiating corrosion properties of differently heat-treated tool steels was established alongside the investigation.
Keywords: deep cryogenic treatment, corrosion, microstructure, hardness
Published in DiRROS: 01.08.2023; Views: 272; Downloads: 134
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17. Effect of the microstructural properties of copper on corrosion performanceTadeja Kosec, Jure Voglar, Petra Močnik, Andraž Legat, 2021, original scientific article Abstract: The aim of the study was to define the influence of microstructural properties on the electrochemical properties of copper in four different forms: copper in sheet form, copper doped with phosphorus, electroplated copper and copper wire. Open circuit potential and polarization resistance measurements were carried out in order to determine the electrochemical properties and corrosion rates of copper in 0.1 M NaCl solution in oxic conditions at ambient temperature. Statistical evaluation of the electrochemical data was performed in order to differentiate between the various forms of copper samples. Microstructural and electrochemical investigations were combined with electron microscopy and Raman analysis of the corrosion products after immersion of the copper samples in a 0.1 M NaCl solution for 30 days. The various morphologies of copper corrosion products were identified and analyzed by Raman spectroscopy for the various forms of copper.
Keywords: copper, microstructura, corrosion, Raman
Published in DiRROS: 19.07.2023; Views: 292; Downloads: 139
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18. Diagnostic accuracy of tensiomyography parameters for monitoring peripheral neuromuscular fatigueMiloš Kalc, Katarina Puš, Armin Paravlić, Jure Urbanc, Boštjan Šimunič, 2023, original scientific article Abstract: The diagnostic accuracy of tensiomyography (TMG) parameters compared to the gold standard in neuromuscular fatigue evaluation using voluntary and electrically induced muscle activation is unclear. This study aimed to investigate the diagnostic accuracy of TMG parameters to detect individual changes after interventions that were designed to induce central or peripheral fatigue. Nineteen males (age: 32.2 ± 9.3 years) performed two interventions, consisting of maintaining 25% of maximal voluntary contraction (MViC25%) and a 30 s all-out cycling test (Wingate), respectively. TMG parameters, maximum voluntary contraction (PtMViC), voluntary activation (VA%) and electrically elicited double twitches (Dtw) were assessed on the knee extensors before (PRE), one minute (POST) and seven minutes after (POST7) the intervention. The diagnostic accuracy (AUC) of TMG parameters were evaluated in comparison to two criteria measures (PtMViC and Dtw). RM ANOVA revealed a significant interaction between the effects of intervention and time on VA% (p = 0.001) and Dtw (p < 0.001) but not for PtMViC (p = 0.420). AUC showed that TMG parameters had a good ability in detecting muscular fatigue assessed by Dtw but not by PtMViC. The results of the current study suggest that TMG parameters can be used to monitor peripheral neuromuscular fatigue.
Keywords: tensiomyography, vastus lateralis, MVC, twitch
Published in DiRROS: 13.06.2023; Views: 337; Downloads: 187
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