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Effects of yttria content on the CMAS infiltration resistance of yttria stabilized thermal barrier coatings system

Journal of Materials Science & Technology 2020年第8期36卷 74-83页

作者： Juan JGomez Chavez Ravisankar Naraparaju Peter Mechnich Klemens Kelm uwe schulz C.V.Ramana University of Texas at El Paso Department of Mechanical EngineeringEl PasoTX79968USA German Aerospace Center(DLR) Institute of Materials ResearchCologne51170Germany

The effects of YO(1.5)doping in yttria-zirconia based thermal barrier coatings(TBCs)against CMAS interaction/infiltration are *** TBCs with an YO(1.5)content ranging from 43–67 mol.%(balance Zr O2)were produced by electron beam physical vapor deposition(EB-PVD)*** results reveal a trend of higher apatite formation probability with the higher free YO(1.5)available in the yttriazirconia ***,the infiltration resistance and amount of consumed coating appears to be strongly dependent on the YO(1.5)content in the *** thinnest reaction layer and lowest infiltration was found for the highest produced 67 YO(1.5)*** XRD experiments with volcanic ash/YO(1.5)powder mixtures with higher yttria contents than in the coatings(80 YO(1.5)and pure YO(1.5))also showed higher apatite formation with respect to increasing yttria *** threshold composition to promote apatite-based reaction products was found to be around 50 YO(1.5)in zirconia which was proved in the coatings and XRD powder *** YO(1.5)-ZrO2-Fe O-TiO2 bearing zirconolite-type phase was formed as a reaction product for all the coating compositions which implicates that TiO2 in the melt acts as a trigger for zirconolite *** phase could be detrimental for CMAS/volcanic ash infiltration resistance since it can be formed alongside with apatite which controls or limits the amount of Y^(3+)available for glass *** Fe rich garnet phase containing all the possible elements exhibited a slower nucleation compared to apatite and its growth was enhanced with slow cooling *** implications of phase stability and heat treatment effects on the reaction products are discussed for tests performed at 1250°C.

关键词： CMAS Volcanic ash Infiltration Electron beam physical vapor deposition Thermal barrier coating

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GLOBAL HISTORY, ENTANGLED AREAS, CULTURAL CONTACTS–AND THE ANCIENT WORLD

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Journal of Ancient Civilizations 2018年第1期33卷 115-130页

作者： Raimund schulz uwe Walter University of Bielefeld

Intertwined Institutions:Slavery as an Example While Global History and Entangled History are nowadays very much focused on modern times,there is a central area in which ancient history has set the pace for research since the 18th century:*** was common in many parts of the world up to the 19th century,it connected regions that were far apart,and it had drastic repercussions on both the"delivering"and the"receiving"areas.

关键词：历史纠缠文化中央区域古代史时间

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Prevalence of Mental Disorders and Health Service Utilization among Individuals with Turkish Migration Backgrounds in Germany: A Study Protocol for an Epidemiological Investigation

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Open Journal of Psychiatry 2016年第3期6卷 237-252页

作者： Mike Mösko Demet Dingoyan Simone Penka Azra Vardar Holger schulz uwe Koch Andreas Heinz Ulrike Kluge Department of Medical Psychology University Medical Center Hamburg-Eppendorf Hamburg Germany Clinic for Psychiatry and Psychotherapy Charité—University Medicine Berlin Germany Department of Migration Mental and Physical Health and Health Promotion BIM—Berlin Institute for Empirical Integration and Migration Research Humboldt University zu Berlin Berlin Germany

Background: There is a lack of reliable epidemiological data on prevalence and comorbidity rates of mental disorders in the migrant population in Germany. Despite existing national and international data on the extent of psychosocial burdens in migrant populations the prevalence among the study population remains unclear. The aim of this study was to collect prevalence data for the largest migrant population in Germany-individuals with Turkish migration backgrounds—using a culturally and linguistically sensitive approach. Methods: The study employs a cross-sectional design. The multi-centre study (Hamburg, Berlin) is based on a sample of individuals with Turkish migration backgrounds living in the two cities stratified by age, gender, and education. The study programme consists of three phases: 1) a qualitative focus group to collect information on how to increase the participation rate of the target population as a minority group in Germany;2) a translation phase to create culture and linguistic sensitive versions of the assessment tools (e.g., the Composite International Diagnostic Interview (CIDI) for Turkish speaking individuals;and 3) a baseline community study to assess the lifetime, 12-month and four-week prevalence and comorbidity rates of mental disorder, health care utilization and help-seeking behaviour in individuals of Turkish migration backgrounds living in Germany. Discussion: The study provides important data on the lifetime prevalence of mental disorders and health care utilization of individuals with Turkish migration backgrounds. Furthermore, the study is an important step towards gaining a better understanding of potential barriers to participation, creating resources for difficult-to- reach minorities, and understanding the need for assessing mental disorders in migrant populations. These results can offer a starting point for the initiation of the necessary structural changes for mental health care services and policies for groups with migratio

关键词： Mental Health Mental Disorder Migration Turkish Germany Prevalence Comorbidity Health Care Utilization Composite International Diagnostic Interview (CIDI) Epidemiology

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