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    Mechanical Behavior İnvestigation Of Fused Deposition Modeling Joints By Using Different Bonding Geometry With Variable Adhesive Thickness
    (RAPID PROTOTYPING JOURNAL, 2024-01-22) Kemiklioglu, Ugur; Demir, Sermet; Yuksel, Caner
    PurposeAdhesively bonded joints are used in many fields, especially in the automotive, marine, aviation, defense and outdoor industries. Adhesive bonding offers advantages over traditional mechanical methods, including the ability to join diverse materials, even load distribution and efficient thermal-electrical insulation. This study aims to investigate the mechanical properties of adhesively bonded joints, focusing on adherends produced with auxetic and flat surfaces adhered with varying adhesive thicknesses.Design/methodology/approachThe research uses three-dimensional (3D)-printed materials, polyethylene terephthalate glycol and polylactic acid, and two adhesive types with ductile and brittle properties for single lap joints, analyzing their mechanical performance through tensile testing. The adhesion region of one of these adherends was formed with a flat surface and the other with an auxetic surface. Adhesively bonded joints were produced with 0.2, 0.3 and 0.4 mm bonding thickness.FindingsResults reveal that auxetic adherends exhibit higher strength compared to flat surfaces. Interestingly, the strength of ductile adhesives in auxetic bonded joints increases with adhesive thickness, while brittle adhesive strength decreases with thicker auxetic bonds. Moreover, the auxetic structure displays reduced elongation under comparable force.Originality/valueThe findings emphasize the intricate interplay between adhesive type, bonded surface configuration of adherend and bonding thickness, crucial for understanding the mechanical behavior of adhesively bonded joints in the context of 3D-printed materials.
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    New Ester-Containing Azole Derivatives With Potent Anti-Candida Effects: Synthesis, Antifungal Susceptibility, Cytotoxicity, and Molecular Modeling Studies
    (DRUG DEVELOPMENT RESEARCH, 2024-11) Ataker, Yusuf; Oncue, Ozge; Gulmez, Dolunay; Sabuncuoglu, Suna; Arikan-Akdagli, Sevtap; Sari, Suat
    Mortalities due to mycoses have dramatically increased with the emergence of drug-resistant strains and growing immune-compromised populations globally. Azole antifungals have been the first choice against fungal infections of a wide spectrum and several azole derivatives with ester function were reported for their potentially promising and favorable activity against Candida spp. In this study, we designed and synthesized a series of 1-(aryl)-2-(1H-imidazol-1-yl/1H-1,2,4-triazol-1-yl)ethyl esters, and tested them against seven reference Candida strains using EUCAST reference microdilution method. Among the series, 6a, 6d, and 6g proved highly potent in vitro compared to fluconazole; especially against Candida albicans and Candida tropicalis with minimum inhibitor concentration (MIC) values as low as 0.125 and 0.06 mg/L, respectively, although their activities against Candida krusei and Candida glabrata remained limited. The compounds also showed minimal toxicity to murine fibroblasts according to the in vitro cytotoxicity tests. Molecular modeling predicted 6g as an orally available druglike compound according to all parameters and CYP51 inhibition as the likely mechanism for their antifungal effects. The study underpins the promise of azoles with ester functionality as a potential scaffold for small-molecule antifungal drug design.
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    Effect of Thiophene Units on the Properties of Donor Acceptor Type Monomers and Polymers Bearing Thiophene-Benzothiadiazole- Scaffolds
    (2016) Cansu-Ergun, Emine G.; Akbayrak, Merve; Akdag, Akin; Onal, Ahmet M.; 0000-0002-0058-905X; 0000-0003-3283-2146; 0000-0002-3941-4345; 0000-0003-0644-7180; 0000-0003-3283-2146; A-7063-2010; N-5377-2016; I-7385-2017; AAS-5007-2020; HCG-9312-2022
    In this article, a series of benzothiadiazole and thiophene based donor-acceptor-donor (D-A-D) type monomers and their corresponding polymers, via potential cycling, were reported. Effect of increasing number of thiophene units in the electron rich donor segment on the electrochemical and photophysical properties of the monomers and their corresponding polymers were reported. Electrochemical and optical properties were determined by cyclic voltammetry, UV-Vis and emission spectrometry. Monomers with one, two and three thiophene units on both sides of benzothiadiazole (TBz, T2Bz, T3Bz) exhibited better conjugation and intramolecular charge transfer with increasing thiophene length. On the other hand, the inverse trend was observed in their corresponding polymers (PTBz, PT2Bz, PT3Bz). Blue shift of the absorption edge in polymer thin films resulted in wider optical bandgap (from 1.70 eV to 1.99 eV) with increasing donor/ acceptor ratio on the polymer chain. Based on our experimental and theoretical studies, molecular weight or branching on these polymers together with degree of stiffness and conformational degree of freedom might be an explanation for these controversial observations. (C) 2016 The Electrochemical Society. All rights reserved.
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    Soft Skills Needed In Solving Management Control Problems
    (2017) Genc, Serdar; Sigri, Unsal; 0000-0002-8870-7398; ADV-8340-2022
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    Topsis Based Taguchi Method for Multi-Response Simulation Optimization of Flexible Manufacturing System
    (2014) Ic, Yusuf Tansel; Dengiz, Berna; Dengiz, Orhan; Cizmeci, Gozde; 0000-0001-9274-7467; AGE-3003-2022
    This study presents a simulation design and analysis case study of a flexible manufacturing system (FMS) considering a multi-response simulation optimization using TOPSIS (Technique for Order Preference by Similarity to Ideal Solution) based Taguchi approach. While in order to reduce expensive simulation experiments with the Taguchi design, the TOPSIS procedure is used to combine the multiple FMS responses (performance measures) into a single response in the optimization processes. Thus, TOPSIS carries out an important role to build a surrogate objective function that represents multiple responses of the system. The integrated approach finds a new design considering discrete factors (physical and operational parameters) which affect the performance measures of FMS. Optimal design configuration is obtained for the considered system with improved performance.
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