Chain extension of polyamide 6/organoclay nanocomposites

YesThermal degradation of polyamide 6 (PA6)/organoclay nanocomposites is a serious impediment to wider applications of these nanocomposites. In this study, a solution is proposed based on the well‐established use of chain extenders. As in PA6, thermal degradation, in the absence of moisture, produces broken polymer chains with amide end groups, a chain extender with anhydride functionalities, known to be strongly reactive with amide groups, was used to reconnect the chains. Experiments conducted using a laboratory twin‐screw extruder were first checked, through transmission electron microscopy observations, to have produced good organoclay intercalation and exfoliation into PA6. Following from this, samples with the chain extender added were produced and characterized. The data obtained were conclusive in the effectiveness of the chain extender: for the chain extended nanocomposites, there is an enhancement in the value of the complex viscosity by 7 times and in the storage modulus by 88 times, while the tensile modulus increased by 57% compared with the neat PA6. The nonchain extended nanocomposite achieved in comparison an enhancement of 2 times the value of the complex viscosity and 19 times the storage modulus while the tensile modulus increased by 53% compared to the neat PA6. These data provide conclusive proof on the rationale that anhydride functionalities should be sought when developing chain extenders for PA6 nanocomposites.Government of Turke

Proceedings of the Conference on Managing Tourism Across Continents: Volume 3

ISSN: 2834-473

Freze ve delik delme işlemlerinde kullanılan karbür takımların sistematik olarak performans karşılaştırması (Performance comparison of milling and drilling carbide tools)

Bu çalışmada, yerli ve yabancı çeşitli takım üretici firmaların ürettiği karbür freze ve matkaplar laboratuvar ölçümleri ile sistematik olarak karşılaştırılmıştır. Karşılaştırma deneyleri sırasında takım aşınması, kesici geometrisi (talaş açısı, takım yuvarlama yarıçapı vb.), kesme kuvveti ve takım dinamik özellikleri ölçülmüştür. Sonuçlar performans analizleri kapsamında değerlendirilmiş olup kesici uç geometrisi ve deneysel sonuçlara göre yorumlanmıştır

Daha Iyi Bir Dunya Icin Turizm: Sayi 3

Daha İyi Bir Dünya İçin Turizm [Tourism for a Better World] book consists of peer-reviewed (double-blind) Turkish research papers that were presented at the Forth Managing Tourism Across Continents (MTCON23) conference in March 2023. The book is published by the University of South Florida M3 Publishing as open-access. Daha İyi Bir Dünya İçin Turizm kitabı, Mart 2023\u27de Dördüncü Kıtalar Arası Turizm Yönetimi (MTCON23) konferansında sunulan hakemli (çift kör) Türkçe araştırma makalelerinden oluşmaktadır. Kitap, University of South Florida M3 Publishing tarafından açık erişim şekilinde yayınlanmaktadır. ISBN 978-1-955833-11-0 Table of Contents The effect of sound atmosphere on emotion from a travel motivation perspective Esref Ay and Semra Gunay Smart destination from the perspective of tourism academics: A model proposal for Ayvalık Harun Ataman, Oguzhan Dulgaroglu, and Gizem Ozgurel Landscapes with cultural heritage tourism: Adramytteion Ancient City and its surroundings Sabriye Celik Uguz and Bahadir Beyhan Motivations of participants in charity run Fatma Ozdal and Gurhan Aktas The effect of local food consumption motivation on behavioral intention after COVID-19 Ali Solunoglu and Emrah Orgun Bibliometric analysis of graduate theses written in the field of gastronomy in 2021 Sadiye Aslan and Lokman Toprak The effects of local food culture on eating desire in invitations Ezgi Eter and Cavit Yavuz Social tourism in national policy documents in Turkey Nail Hoscan and Erkan Turkseven Evaluation of COVID-19 crisis management practices in the context of city hotels: The case of Aksaray Mehmet Umur and Busra Sener The role of recreation in preventing delinquency and misdemeanor in children Fidel Toker and Hatice Guclu Nergiz Investigation of tourism vocational school students’ perceptions of the concept of alternative tourism using metaphor method Ibrahim Erhan Canbab

Advances in Managing Tourism Across Continents: Volume 3

Advances in Managing Tourism Across Continents book consists of peer-reviewed (double-blind) research papers that were presented at the third Managing Tourism Across Continents (MTCON23) conference in March 2023. The book is published by the University of South Florida M3 Publishing as open-access. ISBN 978-1-955833-09-7 TABLE OF CONTENTS Do isomorphic pressures impede greenwashing in the hospitality industry? A theoretical framework Mert Gurlek Tax in tourism research: A bibliometric analysis Serap Ozdemir Guzel and Tugce Uzun Kocamis COVID-19 and the “most magical place on earth”: Applying the IDEA model to theme park crisis messaging Lakelyn E. Taylor, Gaurav Panse, Carissa Baker, Deanna Sellnow, Timothy Sellnow, and Michael Strawser User-generated content, satisfaction, and WOM in the context of cultural/heritage site Mahlagha Darvishmotevali and Hu Qian Impact of management polyphony in family business: A review Ali Sukru Cetinkaya and Serife Sogancioglu The effect of entrepreneurial traits on career planning in food processing enterprises Ali Sukru Cetinkaya Online gastronomy image: Content analysis of TripAdvisor reviews of restaurants in Istanbul Rana Sat Leisure activity and place requirement for a better life in slow city Ahlat Selin Kama and Nurullah C. Agbay Disabled rooms in hotel industry: A research on perception for disabled rooms Osman Nuri Ozdogan, Cihan Yilmaz, and Eva Abramuszkinova Pavlikova Value creation and employee branding through employees: A model proposal for hotel businesses Ibrahim Cetin, Gunseli Gucluturk Baran, Orhan Icoz, and Tulay Polat Uzumcu The impact of environmental knowledge and environmental behavior of hotel employees on environmental performance: A model proposal Uygar Turgut, Isil Arikan Saltik, Umut Avci, and Fevzi Okumus Reflection of COVID-19 pandemic on organizational trust perception of hotel employees: An intergenerational comparison Isil Arikan Saltik and Yasin Karasu Who is the human resources manager? Metaphorical perceptions of human resources managers towards their profession Ebru Gozen and Aylin Alan Bibliometric analysis of sustainability in gastronomy research Nihan Akdemir and Bilsen Bilgil

Evaluation of cytotoxicity and gelatinases activity in 3T3 fibroblast cell by root repair materials

The aim of this study was to investigate the effects of calcium silicate-based products on cytotoxicity in the 3T3 fibroblast and gelatinolytic activity of matrix metalloproteinases (MMPs). 3T3 fibroblasts were incubated directly with Ortho Mineral trioxide aggregate (MTA), BioAggregate, Biodentine, MTA Plus, MTA Angelus and MTA Cerkamed for 24 hours and seven days. The cytotoxicity was determined using an MTT assay. Supernatants were collected to determine MMP-2 and MMP-9. Data were analysed using IBM SPSS 22. Seventh day extracts of Ortho MTA and Biodentine showed reduced cell viability. Specific characterization of MMPs in cell culture demonstrated that MMP-2 (62 kPa) in the cell culture supernatants by gelatin zymography showed induced expression in four out of seven groups by 3T3 cells. No MMP-9 expression was observed. The cytotoxicity of materials revealed a significant difference in cell viability between the groups on the first and seventh days. The results of this study revealed minor cytotoxic effects for Ortho MTA and Biodentine. This study suggests that endodontic sealers induced production of MMP-2. MMP-9 might be expressed in small amounts when compared with MMP-2

Results of the pilot experiment to search for inelastic interactions of WIMPs with Ge-73

Introduction: Anemia is known to be an important problem in burn injury. We aimed to investigate the protective effect of Solanum tuberosum (potatoes), against abnormal breakdown of erythrocytes in burn injury. Methods: Ninety-six male (9 to 10 weeks old) Swiss Albino mice (34–40 g) were included into the study, which consisted of two phases: dose optimization phase (n = 48) and study phase (n = 48). Half of the mice were given S. tuberosum juice (study group) and the other half drinking water (control group). The optimal dosage causing minimum decline in hematocrit was as follows: 1.6 mL/kg at 0 h, 0.8 mL/kg at 24 hours, and 0.8 mL/kg at 36 hours of burn injury. The burn injury was induced with a solid 10-mm aluminum bar heated in boiling water. Results: The decrease in hematocrit level was significantly lower in the study group than the control group at 24 and 48 hours (P = 0.05 and P = 0.023, respectively). The increase in anisocytosis, a hemolytic anemia sign, was also significantly lower in the study group than the control group at 48 hours (P = 0.021). There was no significant difference between groups in terms of clotting time or the bleeding time. Conclusion: In burn injury, S. tuberosum may be beneficial against anemia and it may reduce the need for red blood cell transfusion

Motor Proficiency In Children With Attention Deficit Hyperactivity Disorder: Associations With Cognitive Skills And Symptom Severity

Objectives: Of children with Attention Deficit Hyperactivity Disorder (ADHD), 45-70% have motor skill problems, which can adversely affect social competence, peer relations, and academic skills. The aim of this study is to assess motor skills in school-aged children with ADHD, and to elucidate if there are any relationships between ADHD symptoms and cognitive function. Method: Included in this study were 58 children (38 ADHD, 20 controls) between 8-11 years of age. Children were diagnosed with ADHD via the Schedule for Affective Disorders and Schizophrenia for School-Aged Children Present and Lifetime Version. The parents were asked to fill out the Conner's' Parent Rating Scale - Revised Short Turkish Form to determine the symptom domains and the symptom severity. The Wechsler Children's Intelligence Scale-IV was used to assess cognitive skills, and the Bruininks -Oseretsky Motor Proficiency Test was used to assess motor skills. Results: Children with ADHD had impaired performance in many motor skill areas compared to the controls. Impairments in fine motor skills were correlated with problems in attention, working memory, and processing speed. In the ADHD group, age was not correlated with motor skills enhancement. Conclusion: The multistage clinical evaluation of ADHD should include screening for problems in motor skills. If deficiencies are found, the child should be clinically evaluated for motor proficiency and, if necessary, should be referred for appropriate objective assessment and intervention programs.WoSScopu

Reliability And Validity Of The Schedule For Affective Disorders And Schizophrenia For School-Age Children-Present And Lifetime Version, Dsm-5 November 2016-Turkish Adaptation (K-Sads-Pl-Dsm-5-T)

Objective: The aim of this study was evaluate the reliability and validity of the Schedule for Affective Disorders and Schizophrenia for School-Age Children-Present and Lifetime Version, DSM-5 November 2016 -Turkish Adaptation (K-SADS-PL-DSM-5-T). Method: A total of 150 children and adolescents between 6 and 17 years of age were assessed with K-SADS-PL-DSM-5-T. The degree of agreement between the DSM-5 criteria diagnoses and the K-SADS-PL-DSM-5-T diagnoses were considered as the measure of consensus validity. In addition, concurrent validity was examined by analyzing the correlation between the diagnoses on K-SADS-PL-DSM-5-T and relevant scales. Interrater reliabilities were assessed on randomly selected 20 participants. Likewise, randomly selected 20 other participants were interviewed with K-SADS-PL-DSM-5-T three weeks after the first interview to evaluate test-retest reliability. Results: The consistency of diagnoses was almost perfect for eating disorders, selective mutism and autism spectrum disorder (K=0.92-1.0), substantial for elimination disorders, obsessive-compulsive disorder, oppositional defiant disorder, generalized anxiety disorder, social anxiety disorder, depressive disorders, disruptive mood dysregulation disorder and attention deficit hyperactivity disorder (K=0.67-0.80). Interrater reliability was perfect for selective mucism (K=1.0), substantial for oppositional defiant disorder, disruptive mood dysregulation disorder, attention deficit hyperactivity disorder, depressive disorders and social anxiety disorder (K=0.63-0.73). Test-retest reliability was almost perfect for autism spectrum disorder (K=0.82), substantial for attention deficit hyperactivity disorder, oppositional defiant disorder, disruptive mood dysregulation disorder, depressive disorders and generalized anxiety disorder (K=0.62-0.78). Conclusion: The results of this study show that the K-SADS-PL-DSM-5-T is an effective instrument for diagnosing major childhood psychiatric disorders including selective mutism, disruptive mood dysregulation disorder and autism spectrum disorder which have recently been added to the schedule.WoSScopu