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Article Citation - WoS: 19Citation - Scopus: 25How Destructive Are Negative Tourist-To Interactions Despite the Mitigating Effect of Optimism?(Elsevier, 2022) Koc, Burcu; Kucukergin, Kemal Gurkan; Dimanche, FredericThis study examined the relationship between negative tourist-to-tourist interaction (NTTI) and tourist emotions, intention to recommend, and revisit intention, based on the stimulus-organism-response paradigm and service dominant logic. It also investigated the moderating effect of optimism in the relationship between NTTI and tourist emotions to highlight the importance of optimism in tourist behavior in COVID-19 times. Data were collected through a survey form from 256 domestic tourists visiting Pamukkale travertines and archaeological site, one of Turkey's leading attractions. The research hypotheses were tested using Partial Least Squares Structural Equation Modeling. The data analysis revealed that NTTI significantly affects tourist emotions. Unpleasantness had a negative and significant effect on intention to recommend, while joy had a positive and significant effect. Besides, joy and positive surprise affected revisit intention positively and significantly. Joy and unpleasantness mediated the relationship between NTTI and intention to recommend. Finally, optimism moderated the relationships between NTTI and joy and NTTI and positive surprise.Article Citation - WoS: 2Citation - Scopus: 2Social and Economic Indicators of Household Income in Turkey: Does Ethnicity Matter?(Springer, 2018) Toros, Emre; Cilasun, Seyit; Toros, AykutIn Turkey, the GDP per capita of eastern regions, where the Kurdish population is dense, is significantly lower than that of the rest of the country. The aim of this paper is to provide a quantitative analysis to investigate the contribution of household characteristics and regional disparities on racial/ethnic inequalities in household income, particularly across Turks and Kurds. Based on the results of regression-based decomposition analyses, there exist significant income differences between Turks and Kurds. However, this difference significantly diminishes if the household head is working. It is also observed that the household income increases with education, while decreases with migration and being settled in economically disadvantaged regions. Results also indicate that differential returns to Turks and Kurds on observable characteristics are lower in higher income quintilesArticle Citation - WoS: 15Citation - Scopus: 17Pei Modifiednatural Sands of Florida as Catalysts for Hydrogen Production From Sodium Borohydride Dehydrogenation in Methanol(Wiley-hindawi, 2021) Inger, Erk; Demirci, Sahin; Can, Mehmet; Sunol, Aydin K.; Philippidis, George; Sahiner, NurettinSand samples from Tampa (T) and Panama (P) City beaches in Florida were used as catalysts for dehydrogenation of NaBH4 in methanol. T and P sand samples were sieved to <250, 250 to 500, and >500 mu m sizes, and the smallest fractions resulted in faster hydrogen generation rates (HGR), 565 +/- 18 and 482 +/- 24 mL H-2 (min.g of catalyst)(-1), respectively. After various base/acid treatments, HGR values of 705 +/- 51 and 690 +/- 47 mL H-2 (min g of catalyst)(-1) for HCl-treated T and P sand samples were attained, respectively. Next, T and P sand samples were modified with polyethyleneimine (PEI) that doubled the HGR values, 1344 +/- 103, and 1190 +/- 87 mL H-2 (min.g of catalyst)(-1) and increased similar to 8-fold, 4408 +/- 187, and 3879 +/- 169 mL H-2 (min g of catalyst)(-1), correspondingly after protonation (PEI+). The Ea values of T and P sand samples were calculated as 24.6 and 25.9 kJ/mol, and increased to 36.1, and 36.6 kJ/mol for T-PEI(+)and P-PEI(+)samples, respectively.Article Citation - WoS: 13Citation - Scopus: 15Build-Operate Projects as a Hybrid Mode of Market Entry: the Case of Yavuz Sultan Selim Bridge in Istanbul(Elsevier Science Bv, 2018) Uner, M. Mithat; Cavusgil, Erin; Cavusgil, S. TamerBOT (Build- Operate-Transfer) projects are well known to sponsors and contractors of mega infrastructure projects around the world. The massive scale and long-term time frame of these construction projects require non-traditional business relationships among the sponsors, prime contractors, sub-contractors, and a host of other vendors. The BOT model is typically sought by local and national governments that cannot independently finance complex mega projects. A BOT deal refers to a large-scale project where the sponsor (typically a governmental agency) contracts with a prime contractor, that assumes the responsibility for completing the construction and operating it for a predetermined period, before turning ownership back over to the sponsor. During this predetermined period, the contractor can recoup its investment through its operations and/or through a guaranteed rate of return from the sponsor. This paper reports on such a project - the case of Yavuz Sultan Selim Bridge, the third bridge linking Asia and Europe in Istanbul, a sprawling metropolis of roughly 15 million people. The bid also called for the construction of the connecting highways. It was initiated in 2012 and was completed in 2016. Named after a celebrated Ottoman Sultan, the bridge is widely acknowledged to address a much-needed infrastructure project for Istanbul. We detail BOT projects - rarely discussed in the IB literature - as a hybrid mode of international market entry, with unique features, benefits, and risks. The insights offered in this manuscript were gathered from a series of unstructured interviews with senior executives of the prime contractors.Article Citation - WoS: 5Citation - Scopus: 5Structural and Electrical Characterizations of the as Grown and Annealed Au/Mοo3< Bandpass Filters(Wiley, 2019) Khanfar, Hazem K.; Qasrawi, Atef; Daraghmeh, Masa; Abusaa, MuayadIn this work, the structural, morphology, and electrical properties of two 500 nm thick molybdenum trioxide layers that are sandwiched with indium slab of thickness of 200 nm (MoO3/In/MoO3 [MIM]) to form a bandpass filter are investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and impedance spectroscopy techniques, respectively. The MIM films which coated onto Au thin film substrates by the thermal evaporation technique under vacuum pressure of 10(-5) mbar was post annealed at 250 degrees C in air atmosphere. While the XRD analysis revealed polycrystalline hexagonal lattice structure of the Au/MLM samples, the SEM and EDS analysis displayed grains of sizes of 350 nm and stoichiometric structure of MoO3. Electrically, indium layer which caused n-type conduction with donor level of 299 meV, forced the material to exhibit negative capacitance (NC) effect at high frequencies (above 1.1 GHz). The impedance spectroscopy which was recorded in the frequency domain of 0.01 to 1.80 GHz, also revealed low pass and high pass filters characteristics in the low and high frequency domains, respectively. The annealing of the Au/MIM samples, decreased the crystallite and grain sizes and increased the microstrain, the defect density and the stacking faults. Small amount of excess oxygen and some indium deficiency are observed upon annealing. In addition, the annealing shifted the donor level closer to the bottom of the conduction band and inverted the NC effect from high to low frequency regions. The study indicates the applicability of the Au/MIM/C structures as microwave cavities and parasitic capacitance cancellers in electronic circuits.Article Citation - WoS: 56Citation - Scopus: 58Reliability Analysis Under Marshall-Olkin Run Shock Model(Elsevier, 2019) Ozkut, Murat; Eryilmaz, SerkanIn this paper, a new shock model called Marshall-Olkin run shock model is defined and studied. According to the model, two components are subject to shocks that may arrive from three different sources, and component i fails when it is subject to k consecutive critical shocks from source i or k consecutive critical shocks from source 3, i = 1, 2. Reliability and mean residual life functions of such components are studied when the times between shocks follow phase-type distribution. (C) 2018 Elsevier B.V. All rights reserved.Article Does Dexmedetomidine Induce Bone Regeneration in Cranial Defects in Rabbits(Taylor & Francis Ltd, 2025) Erkan, Gozde Nur; Tekin, Umut; Boyacioglu, Ozge; Korkusuz, Petek; Orhan, Kaan; Kirman, Betul; Onder, Mustafa ErcumentDexmedetomidine has been shown to exert protective and curative effects on various tissues and organs in different pathological processes. This study aimed to investigate the effect of dexmedetomidine on the regeneration process after making holes in the parietal bones of rabbits. Twenty-four male Oryctolagus cuniculus rabbits were allocated to three groups, and an 8-mm circular parietal critical-sized bone defect was induced in each animal. Group_C (control) received saline; Group_LD (low dose) was given dexmedetomidine 2.75 mu g/kg; Group_HD (high dose), dexmedetomidine 5.5 mu g/kg; all were administered intraperitoneally for 7 days. After 8 weeks the bones were examined by micro-computed tomography (micro-CT) and histomorphometry. The results indicated that regeneration was improved in both the dexmedetomidine-treated groups. The lower dose increased the bone volume ratio (BV/TV) more than the higher dose. Trabecular thickness, connectivity value, and connectivity density were also higher in Group_LD than in Group_HD. Significant intramembranous ossification was observed in the dexmedetomidine-treated groups, and active osteoblasts were seen at the margins of new bone trabeculae. We conclude that dexmedetomidine, especially at the lower dosage, increases osteoblastic activity and regeneration quality.Article Citation - WoS: 10Citation - Scopus: 10The Role of Environmental Factors in the Investment Prioritization of Facilities Using Recycled Pvc(Hard, 2021) Bac, UgurThere are many types of solid wastes however, plastic wastes are among the ones which have several harmful effects on the environment. Plastic wastes have a long decomposition time in nature and the dangerous chemical compounds in them make them a threat for the environment along with other types of waste. Contamination caused by the plastic wastes attracts worldwide attention nowadays. As a member of thermoplastic polymers family, polyvinyl chloride (PVC) products are one of the most preferred type of plastic composition, which holds an important ratio in the total plastic waste amount. PVC wastes should either be disposed or recycled to minimize their harmful effects on the environment. The disposal approach is easy and cheap, but recycling alternative requires the investment on special facilities hence, a more expensive solution. However, disposal alternatives, such as landfilling and incineration, may also cause pollution due to high chlorine content of PVC; whereas, mechanical and chemical recycling options reduce many environmental problems. There is a clear tradeoff in the decision of handling PVC waste between the costs and environmental effects. The purpose of this study is to evaluate the factors considered during the investment decisions of PVC manufacturers to find out the importance of environmental factors by using a multi-criteria group decision making method.Article Citation - WoS: 5Citation - Scopus: 5Aptamer decorated PDA@magnetic silica microparticles for bacteria purification(Springer Wien, 2024) Kavruk, Murat; Babaie, Zahra; Kibar, Gunes; Cetin, Barbaros; Yesilkaya, Hasan; Amrani, Yassine; Ozalp, V. CengizOne significant constraint in the advancement of biosensors is the signal-to-noise ratio, which is adversely affected by the presence of interfering factors such as blood in the sample matrix. In the present investigation, a specific aptamer binding was chosen for its affinity, while exhibiting no binding affinity towards non-target bacterial cells. This selective binding property was leveraged to facilitate the production of magnetic microparticles decorated with aptamers. A novel assay was developed to effectively isolate S. pneumoniae from PBS or directly from blood samples using an aptamer with an affinity constant of 72.8 nM. The capture experiments demonstrated efficiencies up to 87% and 66% are achievable for isolating spiked S. pneumoniae in 1 mL PBS and blood samples, respectively.Article Citation - WoS: 4Citation - Scopus: 4Incidence and Predictors of Permanent Pacemaker Implantation After Transcatheter Aortic Valve Implantation With a Balloon-Expandable Biosprosthesis in Patients With Bicuspid Aortic Valves(Termedia Publishing House Ltd, 2024) Suygun, Hakan; Kasapkara, Haci Ahmet; Guney, Murat Can; Polat, Melike; Bozkurt, EnginIntroduction:
There are few data on permanent pacemaker implantation (PPMI) in patients who have undergone transcatheter aortic valve implantation (TAVI) for bicuspid aortic valve (BAV) stenosis.
Aim:
The purpose of this study was to evaluate the predictors and incidence of PPMI in bicuspid patients using a balloon-expandable (BE) TAVI device.
Material and methods:
A total of 62 patients with bicuspid morphology who had undergone successful TAVI using a BE device without previous PPMI were included (retrospectively). Their baseline clinical, electrocardiographic (ECG), echocardiographic, and multislice computed tomography (MSCT) details were collected.
Results:
The incidence of PPMI after TAVI in this BAV cohort was 12.9%. All eight patients with PPMs were found to have type 1 left-right (LR) fusion morphology. In univariate analysis, the presence of right bundle branch block (RBBB) in preprocedural ECG ( p < 0.0001), short membraneous septum (MS) evaluated in MSCT ( p < 0.0001), and increased annulus-left main coronary artery distance ( p = 0.02) were statistically significant for PPMI. Among these parameters included in the model using multivariate Firth logistic regression analysis, the presence of preprocedural RBBB ( p = 0.001) and shortness of the MS in MSCT ( p = 0.004) were independent risk factors for predicting postprocedural PPMI in patients who underwent TAVI among those with BAV.
Conclusions:
Preprocedural RBBB on ECG and shorter MS are independent risk factors for PPMI after TAVI in BAV patients and these parameters should be considered before the procedure to guide clinical decision making. Type 1 LR patients may be considered at increased risk of PPMI.
