https://hdl.handle.net/20.500.12619/973 2026-04-13T16:06:19Z https://hdl.handle.net/20.500.12619/3502 Oxidation behavior of molybdenum nitride coatings Aydın Turan, Şule; Üstel, Fatih Molybdenum nitride coatings were deposited onto H13 hot working tool steel and alumina substrates by arc PVD. The coatings were characterized with respect to their mechanical and structural properties. Oxidation behavior of the coatings on alumina substrates was investigated by TG/DTA. Coated H13 substrates were oxidized in a tube furnace under atmospheric conditions at specific temperatures determined from TG/DTA tests of the same coating on alumina substrate. The oxide scale morphology was characterized by scanning electron microscopy and X-ray diffraction. Resistance to oxidation of Mo-N coatings is poor because of the non-protective nature of their oxides and the volatility of the oxides at moderately high temperatures. The oxides formed during the oxidation were determined as MoO2 and MoO3. The oxidation reaction product MoO3 is a volatile oxide and its evaporation reaction starts at after 550 degreesC. In addition, decomposition of Mo2N starts at 681 degreesC and the decomposition reaction product is metallic molybdenum, which also oxidizes to volatile Moo, (C) 2003 Elsevier Science B.V All rights reserved. 2003-01-01T00:00:00Z https://hdl.handle.net/20.500.12619/3503 The Depression Anxiety and Stress Scale (DASS): The study of validity and reliability Çetin, Bayram; Akın, Ahmet; Çetin Karabat, Burçin This study investigated the validity and reliability of the Turkish version of the Depression Anxiety Stress Scale (DASS). The sample of the study consisted of 590 university students, 121 English teachers and 136 emotionally disturbed individuals who sought treatment in various clinics and counseling centers. Factor loadings of the scale ranged from .39 to .88. Findings from discriminant validity showed that the DASS discriminates the normal and clinical population. Concurrent validity coefficients were found to be high (.87 and .84, respectively). Cronbach internal consistency of the entire scale was .89. Item-total correlations ranged from .51 to .75. Test-retest and split-half reliability coefficient scores were .99 and .96 respectively. These results demonstrate that the DASS is a valid and reliable instrument. 2007-01-01T00:00:00Z https://hdl.handle.net/20.500.12619/3504 Psychometric properties of multiple choice tests scored with traditional and elimination scoring Çetin Karabat, Burçin; Çetin, Bayram Conclusions/Recommendations: In elimination scoring we estimate higher reliability, validity and efficiency with respect to conventional number right scoring. We suggest that the elimination method could be use in large scale testing practices. 2007-01-01T00:00:00Z https://hdl.handle.net/20.500.12619/3505 Reliability and validity of the Turkish version of Loneliness at Work Scale Doğan, Tayfun; Çetin Karabat, Burçin; Çetin, Bayram Objective: Loneliness at Work Scale (LAWS) was developed to measure loneliness at work by Wright, Burt and Strongman. The purpose of the present study was to investigate the psychometric properties of Turkish version of the LAWS. Methods: Four hundred and thirty-six employees (254 females, 182 males) participated in the study. The study was conducted with the sample consisted of employee with an age range between 18 and 52. The psychometric properties of scale were investigated by test re-test, Cronbach's alpha, exploratory and confirmatory factor analysis and criterion related validity methods. Job Satisfaction Scale and Organizational Commitment Scale were used for the criterion related validity. Results: In order to determine the construct validity of LAWS, exploratory and confirmatory factor analysis was conducted. The factor analysis resulted in two factors; emotional deprivation and social companionship, which is same factor structure as the original form. The Cronbach's alpha for the LAWS was 0.91, emotional deprivation was 0.87 and social companionship was 0.83. The computed test re-test reliability coefficient was found to be 0.82 for the LAWS, 0.78 for emotional deprivation and 0.80 for social companionship. As a concurrent validity, the correlation between LAWS and job satisfaction was -0.34, between LAWS and organizational commitment was -0.29. Conclusion: The psychometric properties of the Turkish version of LAWS showed that a satisfactory level of reliability and validity in Turkish employee. (Anatolian Journal of Psychiatry 2009; 10: 271-277) 2009-01-01T00:00:00Z