Effect of molten glass on degradation of stabilized zirconia thermal barrier coatings

Bal Emre,Karabaş Muhammet 한국세라믹학회 2023 한국세라믹학회지 Vol.60 No.2

In this study, Ceria Yttria Stabilized Zirconia based alternative Thermal Barrier Coatings those are resistant to molten glass (Ca–Mg–Al–Silicate) have been manufactured. These alternative coatings have been subjected to molten glass and their thermal cycle lifetimes before and after the Ca–Mg–Al–Silicate interaction have been tested. Infiltration of molten glass through the coating is investigated using energy dispersive spectrometry elemental mapping method. Although the life span of coatings without alumina and titania additives has dropped to the quarter of their life span after molten glass contact, the life span of alumina and titania doped Ceria Yttria Stabilized Zirconia coating has decreased lightly. According to the characterization studies, it was observed that the porosity of the Ceria Yttria Stabilized Zirconia coating with Alumina and Titania additives decreased, and the decrease in the porosity caused the molten glass solution to penetrate the coating less. Monoclinic ⇆ tetragonal phase transformations occur during the thermal cycle and plasma spray process. Cracks occur in coatings due to volume changes caused by these phase transformations. These cracks in the coating enable molten glass to penetrate the coating more easily, however, cerium additive reduces the monoclinic ⇆ tetragonal phase transformation. For these reasons, the addition of cerium, alumina and titania makes the coating more resistant to molten glass and thus the thermal cycle life of the coating is improved. In addition, these additives have improved the adhesion strength of the coatings.

The Use of Nontreated Fiber Obtained from Washingtonia filifera for Dye Removal from Aqueous Phases by Adsorption

Olcayto Keskinkan,Buket Karabaş,Bülent Sarı,Behzat Balcı,Hasan Kıvanç Yeşiltaş 한국섬유공학회 2023 Fibers and polymers Vol.24 No.10

This is the first study to show the use of fibers from the Washingtonia filifera palm tree as an adsorbent for the removal of Crystal Violet (CV) dyestuffs from aqueous solutions by adsorption. The research on new materials to prevent the contamination of pollutants is of great importance. CV is a dye that is known to have toxic and carcinogenic effects and is used in many industries. In this study, the effects of parameters such as initial adsorbate concentration, adsorbent dose, and pH on the adsorption efficiency were investigated. The highest removal efficiency was 95.55% and the maximum adsorption capacity was found to be 85.91 mg/g. The maximum adsorption capacity of the fibers used reached a pH of 8. The BET surface area of the adsorbent was 4.1484 m2/g and the average pore width 6.8563 nm. The average pore volume was 0.00413 cm3/g for mesopores and 0.00017 cm3/g for micropores. Stegmata structures, also called silica bodies, were observed in SEM images. Langmuir, Freundlich, Temkin, and Dubinin-Radushkevich (D-R) isotherms were studied. The Temkin isotherm (R2=0.9692) best explained the results in the stirring experiments. The Freundlich isotherm (R2=0.9643) best explained the stationary phase systems without stirring. It was determined that the equation that best explained the dye removal kinetics was the pseudo-second-order kinetic model.

Association of Syntax Score II with Contrast-induced Nephropathy and Hemodialysis Requirement in Patients with ST Segment Elevation Myocardial Infarction Undergoing Primary Percutaneous Coronary Intervention

Ibrahim Rencuzogullari,Metin Çağdaş,Süleyman Karakoyun,Yavuz Karabağ,Mahmut Yesin,Mustafa Ozan Gürsoy,İnanç Artaç,Doğan İliş,Süleyman Çağan Efe,Kevser Tural,Ibrahim Halil Tanboğa 대한심장학회 2018 Korean Circulation Journal Vol.48 No.1

Background and Objectives Contrast-induced nephropathy (CIN) is a common complication of primary percutaneous coronary intervention (pPCI) and is associated with high mortality and morbidity and long hospital stay in patients with ST elevation myocardial infarction (STEMI). The Syntax Score (SS) has previously been studied in STEMI patients, and it was associated with increased CIN development and long-term mortality. This study investigates a possible relationship between CIN development and Syntax Score II (SSII) and compares SS and SSII by assessing CIN risk in STEMI patients treated with pPCI. Methods A total of 1,234 patients who underwent pPCI were divided into 2 groups according to CIN development. Patients with CIN were further divided into 2 groups according to whether or not they required hemodialysis. Reclassification tables, net reclassification improvement, and integrated discriminative improvement methods were used to assess the additive predictive value of SSII for predicting CIN. Results In the present study, 166 patients (13.5%) had CIN. Although both SS and SSII were significantly higher in CIN patients, only SSII was an independent predictor of CIN (odds ratio [OR], 1.031; 95% confidence interval [CI], 1.012–1.051; p<0.001) and hemodialysis requirement (OR, 1.078; 95% CI, 1.046–1.078; p<0.001). When comparing SSII and SS in their ability to determine CIN risk, we found SSII to have a reclassification improvement of 27.59% (p<0.001) and an integrated discrimination improvement of 9.1% (p<0.001). Conclusions The combination of clinical and anatomic variables can more accurately identify patients who are at high risk for CIN after pPCI. While SSII is harder to calculate than SS, it provides better prediction for CIN and hemodialysis requirement than SS.

Let’s not talk about men: When meaningful female-to-female interaction and dialogue drive higher box office sales

Evans Robert D.,Karabas I.,Andonova Y.,Nochebuena-Evans L. 한국마케팅과학회 2024 마케팅과학연구 Vol.34 No.1

This study explores two unique aspects of diversity, equity, and inclusion (DEI) from the perspective of gender diversity in the field of motion pictures and the dimension of inclusion utilizing the Bechdel-Wallace Test (BWT). A production may pass the BWT if a conversation between two women is not about men, hence the conversation is deemed meaningful. Using a consumer-driven data set, we find a positive effect of the BWT on international and total box office sales. The results also show a unique result in the years following the modern #MeToo movement, leading to enhanced box office returns for domestic, international, and total box office sales. Therefore, in addition to contributing to efforts to better understanding the impact of the addition of gender diversity and inclusion on motion picture performance, female characters’ meaningful conversation with other females will likely lead to higher return on producers’ investment in motion pictures. Practical implications and contributions to feminist film theory and theory of planned behavior are discussed.

Discovery of Stress Responsive TATA-box Binding Protein Associated Factor6 (TAF6) from Finger Millet (Eleusine coracana (L.) Gaertn)

M. S. Parvathi,Karaba N. Nataraja 한국식물학회 2017 Journal of Plant Biology Vol.60 No.4

Drought is one of the major abiotic factors affectingplant growth mainly in the tropical regions. During stressacclimation response, basal transcriptional process is criticalwhich is coordinated by several cofactors, among which TATAboxBinding Protein (TBP) - Associated Factors (TAFs) are themajor proteins involved in pre-initiation complex assembly. Insearch of novel transcriptional regulators, we identified one ofthe factors, TAF6, in a drought cDNA library generated from anadapted crop, finger millet (Eleusine coracana (L.) Gaertn). RTPCRanalysis in leaf tissues of finger millet experiencingdifferent levels of drought, revealed its stress responsiveness inthree different genotypes. The gene is also induced under salt,osmotic and oxidative stresses at seedling stage. Analysis of itspromoter in model plants indicated the presence of cis-elementsassociated with diverse stress responses. Down regulation ofNbTAF6 by virus induced gene silencing (VIGS) approachresulted in a developmentally defective and stress sensitivephenotype in Nicotiana benthamiana. This is the first report onthe up-regulation of EcTAF6 under abiotic stresses and the geneprobably has a crucial role in safeguarding the stress relatedtranscription process. The basal regulators like TAF6 can thus beconsidered as prospective candidates associated with stressacclimation in plants.

Evaluation of dental panoramic radiographic findings in edentulous jaws: A retrospective study of 743 patients “Radiographic features in edentulous jaws”

Taha Emre Kose,Nihat Demirtas,Hulya Cakir Karabas,Ilknur Ozcan 대한치과보철학회 2015 The Journal of Advanced Prosthodontics Vol.7 No.5

PURPOSE. The aim of this study was to determine the frequency of significant panoramic radiographic findings and eventual treatment requirements before conventional or implant supported prosthetic treatment in asymptomatic edentulous patients. MATERIALS AND METHODS. A total of 743 asymptomatic edentulous patients were retrospectively evaluated using a digital panoramic system. We analyzed the radiographic findings, including impacted teeth, retained root fragments, foreign bodies, severe atrophy of the posterior maxillary alveolar bone, mucous retention cysts, soft tissue calcifications and radiopaque?radiolucent conditions. RESULTS. Four-hundred-eighty-seven (65.6%) patients had no radiographic finding. A total of 331 radiographic findings were detected in 256 (34%) patients. In 52.9% (n=175) of these conditions, surgical treatment was required before application of implant-supported fixed prosthesis. However, before application of conventional removable prosthesis surgical treatment was required for 6% (n=20) of these conditions. CONCLUSION. The edentulous patients who will have implant placement for implant-supported fixed prosthesis can frequently require additional surgical procedures to eliminate pathological conditions.

Evaluation of dental panoramic radiographic findings in edentulous jaws: A retrospective study of 743 patients "Radiographic features in edentulous jaws"

Kose, Taha Emre,Demirtas, Nihat,Karabas, Hulya Cakir,Ozcan, Ilknur The Korean Academy of Prosthodonitics 2015 The Journal of Advanced Prosthodontics Vol.7 No.5

PURPOSE. The aim of this study was to determine the frequency of significant panoramic radiographic findings and eventual treatment requirements before conventional or implant supported prosthetic treatment in asymptomatic edentulous patients. MATERIALS AND METHODS. A total of 743 asymptomatic edentulous patients were retrospectively evaluated using a digital panoramic system. We analyzed the radiographic findings, including impacted teeth, retained root fragments, foreign bodies, severe atrophy of the posterior maxillary alveolar bone, mucous retention cysts, soft tissue calcifications and radiopaque-radiolucent conditions. RESULTS. Four-hundred-eighty-seven (65.6%) patients had no radiographic finding. A total of 331 radiographic findings were detected in 256 (34%) patients. In 52.9% (n=175) of these conditions, surgical treatment was required before application of implant-supported fixed prosthesis. However, before application of conventional removable prosthesis surgical treatment was required for 6% (n=20) of these conditions. CONCLUSION. The edentulous patients who will have implant placement for implant-supported fixed prosthesis can frequently require additional surgical procedures to eliminate pathological conditions.