3834 results
Search Results
Now showing 1 - 10 of 3834
Article Citation - WoS: 4Citation - Scopus: 3Insomnia Severity Predicts Psychiatric Symptoms: a Cross-Sectional Study Investigating the Partial Mediations of Worry and Rumination(Routledge Journals, Taylor & Francis Ltd, 2024) Turkarslan, Kutlu Kagan; Cinarbas, Deniz CanelObjective: Insomnia as a disorder on its own or as a symptom of other mental disorders can lead to significant distress and lower quality of life. By exacerbating negative affect and emotion dysregulation, poor sleep and insomnia can contribute to the initiation and maintenance of mental disorders. The aim of this cross-sectional study was to investigate the relationship between insomnia severity and overall psychiatric symptoms (anxiety, depression, obsessive-compulsive symptoms, somatization, phobic anxiety, hostility, interpersonal sensitivity, paranoid ideation, and psychoticism), and the mediational roles of worry and rumination in this relationship. Method: The data was collected from a community sample of 1444 participants (females 69.39%, M-age=27.95, SD=9.37) who completed self-report measures of insomnia severity, worry, rumination, and psychiatric symptoms. The mediational roles of worry and rumination were tested with mediation analysis using the PROCESS Macro. Results: It was found that insomnia severity (beta=0.20, p<.001) significantly predicted psychiatric symptoms directly and via worry and rumination (beta=0.33, p<.001), meaning that worry and rumination partially mediated the relationship between insomnia severity and psychiatric symptoms. The findings were similar after controlling for smoking status, daily screen time, coffee consumption in the evening, weekly exercise frequency, and pre-sleep screen time. Conclusions: Interventions targeting the reduction of insomnia severity and maladaptive emotion regulation strategies (e.g., worry and rumination), as well as the enhancement of adaptive emotion regulation strategies (e.g., positive refocusing and mindfulness), may alleviate the adverse effects of insomnia on psychiatric symptoms.Article Citation - WoS: 8Citation - Scopus: 9A New Approach To the Existence and Uniqueness of Solutions for A Class of Nonlinear Q-Fractional Boundary Value Problems(Institute of Applied Mathematics of Baku State University, 2025) Karapinar, E.; Sevinik-Adiguzel, R.; Aksoy, U.; Erhan, I. M.The object of this study is a boundary value problem associated with a q-difference equation of fractional order. The existence and uniqueness of a solution in the case of multi-point boundary conditions is studied from the viewpoint of fixed point theory. An integral equation equivalent to the boundary value problem is derived and the fixed points of the related integral operator are investigated by using a contractive condition involving a comparison function. The Ulam-Hyers stability of the problem is also discussed. Theoretical results are followed by a particular example.Master Thesis Anayasa Mahkemesine Bireysel Başvurularda Kabul Edilebilirlik Kriteri Olarak Başvuru Yollarının Tüketilmesi(2022) Sevim, Zübeyr Bayram; Ergül, OzanBireylerin temel hak ve özgürlüklerinin en etkili şekilde korunması için belirli mekanizmalar oluşturulmaktadır. Bireysel başvuru mekanizması da bunlardan biridir. Bireysel başvuru mekanizması, Anayasa Mahkemesi'ne (AYM) hak ihlali iddiası ile yapılacak bir başvuru ile işletilmektedir. Başvurucu kamu gücü tarafından temel hak ve özgürlüklerinin ihlal edildiği iddiası ile ihlalin ortadan kaldırılması için olağan kanun yollarına başvurduğu halde söz konusu ihlal ortadan kalkmamış veya ihlalin neden olduğu zarar tazmin edilmemiş ise, AYM'ye bireysel başvuruda bulunulabilecektir. Ancak bireysel başvuruda bulunabilmek için belli birtakım kriterler vardır. Bu kriterlerden biri de 'başvuru yollarının tüketilmesi' kriteridir. Bu kritere göre; kamu gücü tarafından temel hak ve özgürlükleri ihlal edilen birey, ihlalin ortadan kaldırılması ve ortaya çıkan zararın tazmini için etkili ve erişebilir olan tüm başvuru yollarını tüketmek zorundadır. Aynı zamanda ihlali ortadan kaldırıcı ve zararı tazmin edici idari makamlar mevcutsa, söz konusu bu makamlara da başvuru yapılması ve bu yollarında tüketilmesi zorunludur. Başvuru yolları tüketilmeden yapılan bireysel başvurular, AYM tarafından kabul edilemez bulunacaktır. Başvuru yollarının tüketilmesi kriterinin temel amacı kamu gücü tarafından bireylerin temel hak ve özgürlüklerin ihlal edildiği iddiasının öncelikle Devletin olağan mekanizmaları tarafından çözüme kavuşturulmasını sağlamaktır. Bireylerin temel hak ve özgürlüklerinin korunması Devletin en temel görevidir. Bireylerin temel hak ve özgürlüklerinin ihlal edilmesi ve bu ihlal nedeniyle ortaya çıkan zararları devletin mekanizmaları tarafından giderilemediği takdirde, AYM devreye girmektedir. Buradan çıkarılacak sonuç, bireysel başvurunun kanun yolu veya idari makamlara başvurudan farklı olarak olağan dışı bir yol olduğudur. Dolayısıyla bireysel başvuru mekanizması, bu haliyle ikincillik ilkesine dayanmaktadır. Bu tezin amacı AYM'ye bireysel başvuruda bulunabilmek için kabul edilebilirlik kriterlerinden olan başvuru yollarının tüketilmesi kriterinin anlamını, amacını, kapsamını, sınırlarını ve istisnalarını ortaya koymaktır.Article Citation - WoS: 5Citation - Scopus: 5Development and Psychometric Analysis of a Pediatric Oncology Nurses' Educational Needs Scale(Wiley, 2023) Kudubes, Asli Akdeniz; Semerci, Remziye; Ozbay, Sevil Cinar; Ay, Ayse; Boztepe, HandanBackground/objectivesIt is important to determine the educational needs of pediatric oncology nurses in order to maximize and implement nursing care interventions. Therefore, this study aims to develop a valid and reliable measurement tool to determine pediatric oncology nurses' educational needs and examine its psychometric properties. Design/methodsThis methodological study was conducted with 215 pediatric oncology nurses in Turkey between December 2021 and July 2022. Data were collected with the "Nurse Information Form" and "Pediatric Oncology Nurses' Educational Needs Scale." IBM SPSS 21.0 and IBM AMOS 25.0 software programs were used for data analysis, and descriptive statistics were used to analyze numeric variables. Exploration and confirmatory factor analyses were performed to determine the scale's factorial structure. ResultsThe factorial analysis was used to test the structural validity of the scale. A five-factor structure consisting of 42 items was developed. The Cronbach's alpha coefficient for "Illness" was .978, "Chemotherapy and Side Effect" was .978, "Another Therapy and Side Effect" was .974, "Palliative Care" was .967, "Supportive Care" was .985, and the total score was .990. Fit indices resulting from the study were chi(2)/SD: 3.961, root mean square error of approximation (RMSEA): 0.072, goodness-of-fit index (GFI): 0.95, comparative-of-fit index (CFI): 0.96, and normed fit index (NFI): 0.95. ConclusionThe Pediatric Oncology Nurses' Educational Needs Scale is a valid and reliable scale for pediatric oncology nurses to determine their educational needs.Article Citation - WoS: 49Citation - Scopus: 55Synthesis of Α-fe2o3< Heterogeneous Composites by the Sol-Gel Process and Their Photocatalytic Activity(Elsevier Science Sa, 2020) Bouziani, Asmae; Park, Jongee; Ozturk, Abdullahalpha-Fe2O3/TiO2 heterogeneous composites were synthesized by the sol-gel process to increase the photocatalytic activity of TiO2. The structural, morphological, and optical characteristics of the composites were determined by X-ray diffraction, scanning electron microscope, and UV-vis diffuse reflectance spectroscopy. Results revealed that the incorporation of alpha-Fe2O3 to TiO2 widened the visible light absorption ability of TiO2. It was realized that the calcination temperature plays a crucial role in morphology development hence photocatalytic activity of the alpha-Fe2O3/TiO2 heterogeneous composites. The photocatalytic activity of the composites calcined at various temperatures was evaluated for the degradation of Methylene Blue (MB) and Phenol (Ph) in aqueous medium under UV and sun-like illuminations. The alpha-Fe2O3-TiO2 composites exhibits superior photocatalytic efficiency to degrade both MB and Ph as compared to both pristine TiO2 and pristine alpha-Fe2O3 under sun-like illumination. The alpha-Fe2O3/TiO2 composite degraded approximately 90 % of MB and 50 % of Ph in 180 min sun-like illumination. Improvement in photocatalytic activity is attributed to the separation of photogenerated electron/hole pairs through the interaction of alpha-Fe(2)O(3 )and TiO2.Article Citation - WoS: 14Citation - Scopus: 14Analysis of Temperature-Dependent Forward and Leakage Conduction Mechanisms in Organic Thin Film Heterojunction Diode With Fluorine-Based Pcbm Blend(Springer, 2020) Yildiz, D. E.; Gullu, H. H.; Toppare, L.; Cirpan, A.The forward and reversed biased current-voltage behaviors of the organic diode were detailed in a wide range of temperatures. In this diode, a donor-acceptor-conjugated copolymer system was constructed with poly((9,9-dioctylfluorene)-2,7-diyl-(2-dodecyl-benzo[1,2,3]triazole)) as a partner of [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Two-order of magnitude rectification ratio was achieved, and the temperature-dependent values of saturation current, zero-bias barrier height, and ideality factor were extracted according to the thermionic emission model. The temperature responses of these diode parameters showed an existence of inhomogeneity in the barrier height formation. As a result, the observed non-ideal behavior was explained by Gaussian distribution of barrier height where low-barrier regions are effective in the forward biased conduction mechanism at low temperatures. Together with this analysis, series resistances were evaluated using Cheung's functions and also density of interface states were investigated. On the other hand, reverse biased current flow was found under the dominant effect of Poole-Frenkel effects associated with these interfacial traps. The reverse current conduction mechanism was detailed by calculating characteristic field-lowering coefficients and barrier height values in the emission process from the trapped state in the range of temperatures of interest.Article Yeniden Çeviride Zamana Karşı Bağlam: The Jungle Book Üzerinden Yeniden Çeviri Hipotezinin Yeniden İncelenmesi(2023) Özer, Özge BayraktarRudyard Kipling Türkçeye ilk olarak bir çocuk edebiyatı eseri olan The Jungle Book’un 1936 yılında yayınlanan çevirisi (Cengel Kitabı) ile kazandırılmıştır. Söz konusu ilk çeviriyi günümüze kadar pek çok yeniden çeviri takip etmiştir. Bu çalışma, The Jungle Book eserinin beş farklı Türkçe çevirisi üzerinden yeniden çeviri hipotezinin temel varsayımlarını yeniden sınamayı amaçlamaktadır. Yeniden çeviriler hem birbirleriyle hem de ilk çeviriyle metne bağlı ve kültüre özgü unsurlar açısından karşılaştırılmıştır. Bu doğrultuda benimsenen yöntem açısından, çalışma iki kısımdan oluşmaktadır. İlk kısımda, incelenen çevirilerin yayınlandığı dönemlerdeki sosyo-bağlamsal koşulları odağına alan artsüremli bir inceleme yer almaktadır. İkinci kısımda ise yeniden çeviri hipotezini yeniden sınamak üzere eşsüremli incelemeye yer verilmiştir. Sunulan karşılaştırmalı örneklere dayanarak, yeniden çeviri hipotezinde öne sürüldüğü gibi ilk çeviri ve yeniden çeviriler arasında, erek odaklı yaklaşıma yönelik doğrusal bir ilerlemenin bulunmadığı tespit edilmiştir. Bunun yerine, çevirinin üretildiği ve yayımlandığı dönemin bağlamsal faktörlerinin, çevirmenlerin çeviri seçimlerinde daha etkili olduğu tespit edilmiştir. Ayrıca, hipotezin doğrulanması ya da yanlışlanmasında, vaka analizi yöntemindeki örnek metin seçimlerinin de etkili olabileceği gösterilmiştir. Bu bağlamda, yeniden çeviri kavramı ve yapısına ilişkin daha güvenilir bulgular için artsüremli ve eşsüremli incelemenin bütüncül bir anlayışla bir arada yapılması önerilmiştir.Conference Object Statistical Randomness Tests of Long Sequences by Dynamic Partitioning(Ieee, 2020) Akcengiz, Ziya; Asian, Melis; Karabayir, Ozgur; Doganaksoy, Ali; Uguz, Muhiddin; Sulak, FatihRandom numbers have a wide usage in the area of cryptography. In practice, pseudo random number generators are used in place of true random number generators, as regeneration of them may be required. Therefore because of generation methods of pseudo random number sequences, statistical randomness tests have a vital importance. In this paper, a randomness test suite is specified for long binary sequences. In literature, there are many randomness tests and test suites. However, in most of them, to apply randomness test, long sequences are partitioned into a certain fixed length and the collection of short sequences obtained is evaluated instead. In this paper, instead of partitioning a long sequence into lixed length subsequences, a concept of dynamic partitioning is introduced in accordance with the random variable in consideration. Then statistical methods are applied. The suggested suite, containing four statistical tests: Collision Tests, Weight Test, Linear Complexity Test and Index Coincidence Test, all of them work with the idea of dynamic partitioning. Besides the adaptation of this approach to randomness tests, the index coincidence test is another contribution of this work. The distribution function and the application of all tests are given in the paper.Article Citation - WoS: 11Citation - Scopus: 12A New Mixed Δ-Shock Model With a Change in Shock Distribution(Springer, 2023) Chadjiconstantinidis, Stathis; Tuncel, Altan; Eryilmaz, SerkanIn this paper, reliability properties of a system that is subject to a sequence of shocks are investigated under a particular new change point model. According to the model, a change in the distribution of the shock magnitudes occurs upon the occurrence of a shock that is above a certain critical level. The system fails when the time between successive shocks is less than a given threshold, or the magnitude of a single shock is above a critical threshold. The survival function of the system is studied under both cases when the times between shocks follow discrete distribution and when the times between shocks follow continuous distribution. Matrix-based expressions are obtained for matrix-geometric discrete intershock times and for matrix-exponential continuous intershock times, as well.Article Citation - WoS: 9Citation - Scopus: 10Characterization of Properties of Vanadium, Boron and Strontium Addition on Hpdc of A360 Alloy(Elsevier Science Sa, 2021) Gursoy, Ozen; Colak, Murat; Tur, Kazim; Dispinar, DeryaThe demand for lighter weight decreased thickness and higher strength has become the focal point in the automotive industry. In order to meet such requirements, the addition of several alloying elements has been started to be investigated. In this work, the additions of V, B, and Sr on feedability and tensile properties of A360 has been studied. A mold design that consisted of test bars has been produced. Initially, a simulation was carried out to optimize the runners, filling, and solidification parameters. Following the tests, it was found that V addition revealed the highest UTS but low elongation at fracture, while B addition exhibited visa verse. On the other hand, impact energy was higher with B additions.
