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Prediction and Optimization of PETG Part Hardness in 3D Printing: A Comparative Study of Experimental Design Methods
Get PDFThis study compared Box-Behnken Design (BBD), Definitive Screening Design (DSD), and Taguchi design methods to predict and optimize surface hardness in polyethylene terephthalate glycol (PETG) parts fabricated by fused deposition modeling (FDM). Critical printing factors including layer thickness (LT), infill density (ID), nozzle temperature (NT), and printing speed (PS) were analyzed to develop accurate prediction models while minimizing experimental runs. The comparative analysis revealed that all three methods provided reliable hardness predictions, with BBD showing superior accuracy (3.74% error), followed by DSD (4.25%) and Taguchi (4.84%). ID emerged as the most influential factor on surface hardness across all methods. BBD required 27 experimental runs, while DSD and Taguchi needed only 13 and 9 runs, respectively, demonstrating significant efficiency in experimental design. The optimal parameter combinations were validated through confirmation tests, achieving maximum hardness values of 62.47 Shore D (Taguchi), 57.16 Shore D (BBD), and 59.95 Shore D (DSD). These findings provide practical guidelines for industrial applications, enabling manufacturers to select the most suitable design method based on their specific requirements for accuracy versus experimental efficiency in PETG part production
E-DEVLET UYGULAMALARININ YOLSUZLUĞU AZALTMA POTANSİYELİ: AMPİRİK BİR İNCELEME
Get PDFBu çalışma, e-devlet gelişmişlik endeksinin yolsuzluk endeksi üzerindeki etkisini araştırmaktadır. Bu ilişkiyi analiz etmek için 167 ülkeden elde edilen verilere Hansen'in (2000) eşik regresyon metodu uygulanmıştır. Çalışmada, e-devlet uygulamalarının yolsuzluğu hangi eşik seviyesinde ve ne ölçüde etkilediği incelenmiştir. Ampirik analiz sonuçları, e-devlet gelişmişlik endeksinin eşik değerinin 0.6285 olduğunu ve bu seviyenin üzerindeki her 0.1 birimlik artışın, yolsuzluk endeksini 0.15 birim arttırdığını göstermektedir. Öte yandan, e-devlet gelişmişlik endeksi 0.6285 eşik değerinin altında istatistiksel olarak anlamlı bir etki göstermemektedir. Sonuç olarak, e-devlet uygulamalarının yaygınlaşması genel olarak yolsuzluğu azaltıcı bir etkiye sahiptir, ancak bu etkinin ortaya çıkması için belirli bir seviyenin aşılması gerekmektedir. Bu bağlamda, politika yapıcılar, e-devlet hizmetlerini yolsuzluğu kontrol etmek için etkili bir araç olarak kullanabilirler
The Acute Effects of Aerobic Exercise on Cognitive Functions ın Young Adults
Get PDFObjective: The acute effects of aerobic exercise on cognitive function in young adults are well-established, yet the acute effects of exercise on cognitive function remain incompletely understood. We aimed to investigate the acute effects of 1-session aerobic exercise on cognitive functions in healthy young adults. This study involved 52 healthy young adults (24 males and 28 females) studying xxx Faculty xxx between xxx. Material and Method: The exercise routine consisted of a 5-minute warm-up, followed by a 20-minute period of increased intensity, and concluded with a 5-minute cool-down. We employed the Stroop Test to evaluate the participants' attention levels. In addition, the number sequence (SD) subtest of the Wechsler Memory Scale-Generalized Form (WMS-G) was used to assess the participants' memory level pre- and post-exercise. Results: The mean age of the participants was 23.34±1.13 years. The participant showed significant improvement in stroop test times but not for number of correct and errors (Stroop 1, stroop 2, stroop 3, stroop 4, and stroop 5= p0.308 and p >0.329). Conclusion: Aerobic exercise has been found to potentially have beneficial effects on cognitive abilities in young adults, even after a single session. Clinicians in the field of cognitive rehabilitation may enhance treatment outcomes by incorporating aerobic activities into rehabilitation programmes. Further studies with large sample groups and different types of aerobic exercises (swimming, running, etc.) are important to more clearly demonstrate the acute effects of aerobic exercises on cognitive functions
A study on e-government services and citizen satisfaction during the COVID-19 pandemic period in Turkey
No full textIn recent years, there has been significant interest in e-government applications, which have become an integral part of daily life, particularly regarding ease of use. This study investigates the factors influencing individuals’ satisfaction with e-government services in Turkey during the COVID-19 pandemic. The research utilized microdata obtained from the Life Satisfaction Survey conducted by the Turkish Statistical Institute in 2020. Ordered logistic regression analysis was employed to identify the factors affecting individuals’ satisfaction with e-government services. The results indicate that sociodemographic and economic variables significantly influence satisfaction levels. Age, education, gender, employment status, and income were determinants of citizens’ satisfaction. Women exhibited a higher level of satisfaction with electronic government services compared to men. The importance of public services became more evident during the COVID-19 pandemic, and integrating the e-government concept into all public institutions has enhanced the capacity to respond swiftly to citizens’ needs. This study offers valuable insights into the determinants of e-government satisfaction during the pandemic. Given the limited research on this topic, future studies from different perspectives will contribute significantly to the literature. © 2025 Elsevier B.V., All rights reserved
Nel Noddings’in Eğitim Felsefesi ve Temel Paradigmaları
Get PDFEğitim felsefesi, eğitimi değişen ve dönüşen toplumsal ihtiyaçlara cevap arama, eğitimin sorunlarını çözme ve bu sorunlara karşı çözüm arama çabası olarak tanımlanabilir. Filozoflar her konuda olduğu gibi eğitim konusunda da toplumsal beklentilere karşı duyarlı davranan bireylerdir. Onlar, toplumsal beklenti ve ihtiyaçlar doğrultusunda yeni arayışlar ve çözüm üretme peşinden kararlılıkla koşarlar. Bu bağlamda, eğitim felsefesi konusunda toplumsal ihtiyaçlara cevap arama mücadelesi veren son dönemin en önemli düşünürlerinden biri de Amerikalı eğitimci Nel Noddings (1929- 2022)’tir. Noddings’in savunduğu eğitim felsefesi, geleneksel eğitim yaklaşımlarına bir eleştiri getirerek eğitim sürecinin öğrencilerin tüm yönleriyle gelişimini savunan bir çerçeve sunar. Bakım etiği, empati, ahlaki eğitim ve bütüncüllük gibi kavramlar, onun eğitim anlayışının temel taşlarını oluşturur. Noddings, eğitimin yalnızca bilgi aktarımından ibaret olmadığını, bunun yanı sıra aynı zamanda öğrencilerle kurulan ilişkilerin, onların bireysel ve toplumsal gelişimlerine ciddi katkı sağladığını savunur. Bu bakımdan, Noddings’in eğitim felsefesi hem pedagojik hem de ahlaki bir boyut taşır. Ayrıca Noddings, birçok eğitimcinin ve eğitim felsefecisinin ıskaladığı adalet, çok kültürlülük, kozmopolitizm, hesap verilebilirlik ve feminizm gibi tartışmaları; eğitim anlayışının en önemli sorunları olarak savunur. Bu çalışmada temel amacımız, Noddings’in eğitim felsefesine yönelik temel tezleri ortaya koymak, onun eğitim felsefesinin modern ve çağdaş eğitimdeki yerini ve önemini tartışmak ile onun eğitim anlayışına yapılan eleştirileri ele almaktır
TRACES OF SLAVERY IN COLLECTIVE MEMORY: COMMON THEMES IN TONI MORRISON'S BELOVED AND HARRIET BEECHER STOWE'S UNCLE TOM'S CABIN
Get PDFFrom the establishment of the United States of America to the mid-20th century, the institution of slavery significantly affected African American society, resulting in profound consequences related to marginalization, racism, racial discrimination, and, most notably, collective memory. In human experience, certain moments or events are sometimes impossible to forget, even when one wishes to do so. Nevertheless, certain events or experiences remain indelibly etched in memory; despite attempts to forget them, they persist in one's consciousness and prevail. Among these concepts, collective memory has been the one that came into prominence among black slaves, even after their freedom. The black society tried to ignore and forget their horrible memories. Two important American writers, Toni Morrison and Harriet Beecher Stowe, have tried to draw attention to the mental and physical damage caused by slavery through their novels. In the novels of both writers, slavery has been abolished, and the protagonists have attained freedom; however, readers' attention is directed by various narrators through flashbacks and recollections to the period during which they were enslaved. This study aims to examine the differences and similarities between these two antislavery literary works focusing on the treatment of collective memory
Opto-electronic studies and diode applications: synthesis, characterization, and photoconductive properties of Schiff base and its Pd(II) and Pt(II) complexes
No full textThis research involved the creation of a Schiff base ligand, (E)-6-tert-butyl 3-ethyl 2-(3-methoxy-4-phenoxybenzylideneamino)-4,5-dihydrothieno[2,3-c]pyridine-3,6(7H)-dicarboxylate (SB), through the condensation reaction of 6-tert-butyl 3-ethyl 2-amino-4,5-dihydrothieno[2,3-c]pyridine-3,6(7H)-dicarboxylate with 3-methoxy-4-phenoxybenzaldehyde. The synthesized Schiff base was then used to form metal complexes with Pd(II) and Pt(II) metal ions. Various analytical techniques, including microanalysis (C, H, N, and S), FT-IR, H-1-NMR, C-13-NMR, UV-Vis., thermal analysis (TGA), powder XRD analysis, mass (ESI), molar conductivity, and magnetic susceptibility, were employed to confirm the structures of synthesized compounds. Spectroscopic data indicated that the Schiff base functions as a chelating agent, utilizing oxygen and nitrogen donor sites. The molar conductance measurements suggested that both complexes are non-electrolytic. A square planar structure was proposed for the Pd(II) and Pt(II) complexes. The study also investigated the electronic and photonic characteristics of the metal complexes under different conditions. Furthermore, a basic diode was fabricated using the metal complex, and its electronic and photonic characteristics were thoroughly investigated. Current-voltage (I-V) measurements showed that the diode based on the Pd(II) complex had notable noise and a high leakage current. On the other hand, the diode with the Pt(II) complex exhibited enhanced photoconductivity as the light intensity increased. [GRAPHICS] .[BAP-21-FEF-4901-02]The authors extended their appreciation to the Researchers Supporting Mus Alparslan University BAP Project number BAP-21-FEF-4901-02
Ni(II) and Cu(II) complexes of pyridine-carboxamide Schiff base: Synthesis, characterization, and antioxidant activities evaluation
No full textBAP-22-FEF-4902-08This research introduces two novel Schiff base complexes: [LNi(H2O)2]H2O and [LCu]3H2O, where L represents (E)-2-(5-bromo-2-hidroksibenzilidenamino)-6-metil-4,5,6,7-tetrahidrotiyeno[2,3-c]piridin-3-karboksamid. These complexes were synthesized by reacting of Schiff base ligand (L) containing ON donor atoms with an equimolar amount of NiCl2·6H2O and Cu(NO3)2·3H2O salts. The compounds were extensively characterized using various analytical and spectroscopic techniques, including elemental analysis, FT-IR, 1H-NMR, 13C-NMR, UV-Vis spectroscopy, mass spectrometry, magnetic susceptibility measurements, molar conductivity, and thermogravimetric analysis. Additionally, the antioxidant properties of both the ligand and complexes were evaluated in vitro using three methods: DPPH free radical scavenging activity, ABTS+ cation radical scavenging activity, and CUPRAC reducing power. From the analytical data, it was observed that the Ni(II) complex has an octahedral structure and the Cu(II) complex has a square planar structure. The antioxidant activity results indicated that some of the complex compounds demonstrated superior antioxidant effects compared to the Schiff base ligand.Mus Alparslan Universit
Turkish adaptation of the catheter assessment, management and performance scale for nurses: Validity, measurement invariance and reliability study
No full textBackground: Indwelling urinary catheter use is common in hospital settings, and its proper management is essential to prevent complications. Aim: To evaluate the Turkish cultural and psychometric properties of the Catheter Assessment, Management, and Performance (CAMP) Scale for Nurses. Methods: This methodological study was conducted in two stages: (1) translation and cultural adaptation of the original scale into Turkish; and (2) evaluation of validity, reliability, and measurement invariance. Data were collected from 460 nurses in two state hospitals in eastern Turkiye (January-April 2025). Psychometric testing included exploratory and confirmatory factor analyses, internal consistency, and test-retest reliability. Results: The four-factor structure was confirmed with factor loadings >0.40 and a total explained variance of 65.27 %. The Kaiser-Meyer-Olkin value was 0.902. Confirmatory factor analysis showed all item t-values >1.96, indicating acceptable model fit. Cronbach's alpha was 0.927, item-total correlations were >0.30, and test-retest correlation was 0.783 (p < 0.001). Conclusions: The Turkish version of the scale is valid and reliable for assessing nurses' performance in urinary catheter care. Practice implications: This tool can be used in clinical practice and nursing education to evaluate and improve nurses' knowledge and skills in urinary catheter care, contributing to enhanced patient safety and reduced catheter-related complications. (c) 2025 Elsevier Inc. All rights are reserved, including those for text and data mining, AI training, and similar technologies
Broken Windows Theory-Based Spectator Behavior Scale (BWTSBS): a validity and reliability study
No full textPurpose The aim of this study is to develop a scale to measure the spectator behaviors of fans and spectators. For this purpose, the research was conducted in two phases.Methods The sample of the study consists of 220 fans aged 18 and over who are interested in different sports branches and support various teams across Turkey. Participants were selected from different geographical regions and socio-economic groups to ensure diversity. Stratified sampling method was used in the study. In this method, fans were first stratified according to the sports they support (e.g., soccer, basketball, volleyball) and random samples were selected from each stratum. In this way, it was ensured that each sport branch was represented and the sample better reflected the population. In the study, Personal Information Form and the Audience Behavior Scale Based on Broken Windows Theory (BWTSBS), which has been validity and reliability study to understand the behaviors of the participants, were used as data collection tools.Methods The sample of the study consists of 220 fans aged 18 and over who are interested in different sports branches and support various teams across Turkey. Participants were selected from different geographical regions and socio-economic groups to ensure diversity. Stratified sampling method was used in the study. In this method, fans were first stratified according to the sports they support (e.g., soccer, basketball, volleyball) and random samples were selected from each stratum. In this way, it was ensured that each sport branch was represented and the sample better reflected the population. In the study, Personal Information Form and the Audience Behavior Scale Based on Broken Windows Theory (BWTSBS), which has been validity and reliability study to understand the behaviors of the participants, were used as data collection tools.Results In the analysis of the data obtained within the scope of the study, exploratory factor analysis was used for the construct validity of the scale and confirmatory factor analysis was used to verify the structure obtained as a result of this analysis. In this analysis, the extent to which the theoretically determined factor structure overlaps with the data is examined. The goodness of fit indices reveal how well the model fits the data. The CFA used in the study was based on fit criteria such as chi 2/df, CFI, GFI, AGFI, NFI, IFI, TLI, RMSEA and RMR to evaluate the fit of the model