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Iskalni niz: "avtor" (Ur%C5%A1i%C4%8D-Vr%C5%A1%C4%8Daj Marjetka) .

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1.
Tribological evaluation of vegetable ▫$oil/MoS_2$▫ nanotube-based lubrication of laser-textured stainless steel
Marjetka Conradi, Bojan Podgornik, Maja Remškar, Damjan Klobčar, Aleksandra Kocijan, 2023, izvirni znanstveni članek

Povzetek: In the present work, the functionalisation of austenitic stainless steel, AISI 316L surfaces via nanosecond Nd:YAG laser texturing in order to modify the surface morphology with crosshatch and dimple patterns is presented. A tribological analysis under lubrication with sunflower and jojoba oil with and without the addition of a solid lubricant, MoS2 nanotubes, was performed. In conjunction with friction/wear response laser-textured surface wettability, oil spreadability and oil retention capacity were also analysed. It was shown that the crosshatch pattern generally exhibited lower friction than the dimple pattern, with the addition of MoS2 nanotubes not having any significant effect on the coefficient of friction under the investigated contact conditions. This was found in addition to the better oil spreadability and oil retention capacity results of the crosshatch-textured surface. Furthermore, texturing reduced the wear of the stainless-steel surfaces but led to an approximately one order of magnitude larger wear rate of the steel counter-body, primarily due to the presence of hard bulges around the textured patterns. Overall, the crosshatch pattern showed better oil retention capacity and lower friction in combination with different vegetable oils, thus making it a promising choice for improving tribological performance in various environmentally friendly applications.
Ključne besede: tribology, stainless steel, vegetable oil lubrication, MoS2 nanotubes
Objavljeno v DiRROS: 02.02.2024; Ogledov: 100; Prenosov: 56
.pdf Celotno besedilo (4,56 MB)
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2.
Influence of oil viscosity on the tribological behavior of a laser-textured Ti6Al4V alloy
Marjetka Conradi, Aleksandra Kocijan, Bojan Podgornik, 2023, izvirni znanstveni članek

Povzetek: Laser texturing with a dimple pattern was applied to modify a Ti6Al4V alloy at the micro level, aiming to improve its friction and wear resistance in combination with oil lubrication to optimize the performance in demanding industrial environments. The tribological analysis was performed on four different dimple-textured surfaces with varying dimple size and dimple-to-dimple distance and under lubrication with three different oils, i.e., T9, VG46, and VG100, to reflect the oil viscosity’s influence on the friction/wear of the laser-textured Ti6Al4V alloy. The results show that the surfaces with the highest texture density showed the most significant COF reduction of around 10% in a low-viscosity oil (T9). However, in high-viscosity oils (VG46 and VG100), the influence of the laser texturing on the COF was less pronounced. A wear analysis revealed that the laser texturing intensified the abrasive wear, especially on surfaces with a higher texture density. For low-texturing-density surfaces, less wear was observed for low- and medium-viscosity oils (T9 and VG46). For medium-to-high-texturing densities, the high-viscosity oil (VG100) provided the best contact conditions and wear results. Overall, reduced wear, even below the non-texturing case, was observed for sample 50–200 in VG100 lubrication, indicating the combined effect of oil reservoirs and increased oil-film thickness within the dimples due to the high viscosity.
Ključne besede: oil lubrication, surface modification, Ti-based alloy, tribology
Objavljeno v DiRROS: 01.02.2024; Ogledov: 130; Prenosov: 45
.pdf Celotno besedilo (4,00 MB)
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3.
Cytology of mediastinal tumors
Milivoj Mermolja, Izidor Kern, Marjeta Terčelj-Zorman, Marjan Jereb, 1997, izvirni znanstveni članek

Povzetek: Our experience with cytological examinations of tumorous mediastinal lesions is evaluated. A group of 117 patients with mediastinal tumor have been included into the study. Among them carcinomas prevailed (60,7%), followed by lymphomas (18,8%), other tumors (15.4%) and thymic neoplasms (5.1%). Malignantor suspicious cells were found in 77.4% of patients with carcinoma. The cells indicating a possibility of non-Hodgkin's lymphoma were found in 9 out of 14 patients. In 5 out of 6 thymic neoplasms the cytological pattern wasconsistent with the diagnosis of thymic neoplasm. One case of thymoma was cytologically falsely diagnosed as malignant lymphoma. One case of neurofibroma was falsely diagnosed as adenocarcinoma. The sensitivity of cytological examinations was 67.5%. If 18 patients with diagnostically unsatisfactory material were excluded from the analysis, the sensitivity wouldincrease to 80.8%. Owing to the wide variety of primary and metastatic tumors that can occur in the mediastinum, apart from the routine cytological techniques, additional staining methods should be used. For final cytological diagnosis the integration of cytological findings with clinical and radiological data is often required. Owing to the characteristics of the obtained material and biological behaviour of some mediastinal tumors, some tumors cannot be definitively diagnosed by cytological examinations alone.
Objavljeno v DiRROS: 18.01.2024; Ogledov: 162; Prenosov: 43
.pdf Celotno besedilo (1,10 MB)

4.
Influence of exogenous hormones on the recurrence and progresion of cancer
Marjetka Uršič-Vrščaj, Sonja Bebar, 1996, izvirni znanstveni članek

Objavljeno v DiRROS: 16.01.2024; Ogledov: 122; Prenosov: 25
.pdf Celotno besedilo (210,30 KB)

5.
Advantages and disadvantages of hormone replacement therapy
Sonja Bebar, Marjetka Uršič-Vrščaj, 1996, pregledni znanstveni članek

Povzetek: In the developed countries, more than 30% of female population is in the postmenopusal period of their life. Approximately one third of these present with severe clinical menopausal symptoms, such as hot flushes, sleeplessness, night sweats, and depression. Many women search medical help. By means of hormone replacement therapy (HRT), these problems can be either completely eliminated or alleviated in 90% of women. The suspected association between HRT and risk of carcinoma should be ignored, however. While estrogens in combination with progestogens exert a protective effec against ovarian and endometrial carcinomas, a possible correlation between HRT and breast cancer has not been fully explained yet. Nevertheless, some published reports have indicated a slightly increased risk of breast cancer after a prolonged use of HRT.
Objavljeno v DiRROS: 16.01.2024; Ogledov: 117; Prenosov: 32
.pdf Celotno besedilo (229,66 KB)

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Presejanje in zgodnje odkrivanje raka
2006, zbornik strokovnih ali nerecenziranih znanstvenih prispevkov na konferenci

Objavljeno v DiRROS: 07.12.2023; Ogledov: 216; Prenosov: 52
.pdf Celotno besedilo (15,22 MB)

9.
Contributions of cytology examination and methods in lung cancer diagnostic
Maja Jerše, Marjeta Terčelj-Zorman, 2006, objavljeni znanstveni prispevek na konferenci

Ključne besede: rak (medicina), diagnostika, citološke preiskave
Objavljeno v DiRROS: 05.12.2023; Ogledov: 149; Prenosov: 45
.pdf Celotno besedilo (742,82 KB)

10.
Zgodnje odkrivanje pljučnega raka
Marjeta Terčelj-Zorman, 2006, objavljeni znanstveni prispevek na konferenci

Ključne besede: pljučne bolezni, pljučni rak, diagnostika
Objavljeno v DiRROS: 05.12.2023; Ogledov: 176; Prenosov: 44
.pdf Celotno besedilo (401,04 KB)

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