Wos İndekslenen Yayınlar

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12597/3196

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3-D Mental Rotation Ability Testing with Mixed Reality
(2023.01.01) Piri, Z.; Cagiltay, K.
Mental Rotation ability is a key skill for success in many careers. Thus, accurate measurement of this ability is important. Three-dimensional holographic displays can help students process mental rotation stimuli easier and demonstrate their real performances without the limitations of two-dimensional representations. There are few studies measuring mental rotation ability in Mixed Reality environments. In this study, we transferred a mental rotation test, Purdue Spatial Visualization Test: Rotations (PSVT:R), into Mixed Reality. We compared the 2-D and 3-D versions of the test in terms of mental rotation performance and cognitive load with 47 participants. While the accuracy of 2-D and 3-D PSVT:R did not differ significantly, the 3-D test induced a lower cognitive load than the 2-D version. Gender difference was observed in the 2-D test but not in the 3-D test. 3-D PSVT:R is an authentic and reliable tool for measuring spatial ability. Moreover, it can be used for training purposes.
A Climate-Sensitive Approach for Determining the Urban Growth Boundaries: Towards a Spatial Exploration for Bursa, Türkiye
(2023.01.01) Isinkaralar, O.
Population growth is inevitable in urban areas responsible for climate crises worldwide, and urban development is affected by processes fed by many dynamics. Predicting and planning the growth limits of the city effectively is a critical issue for achieving sustainable urban growth and managing climate risks. The study used the cellular automata-Markov chain method to define development areas regarding natural structure and land use/land cover. It aimed to present a method that can be applied to different urban areas by focusing on effective urban growth management with a climate-sensitive approach. It offered a climate-sensitive approach to determining growth limits according to scenarios. The boundaries of 2030 have been determined for the city of Bursa, which exhibited an increased average summer value of the land surface temperature from 24 degrees C to 45 degrees C between 2012 and 2021, stands out with its natural riches, and shows a rapid urban growth trend. The proposed method modeled the limits of urban growth with a climate-sensitive approach, and the model's suitability was demonstrated by Kappa statistics (Klocation = 0.8884). The determined urban boundary will reduce the rate of the urban built-up area from 86% to 70% by 2030. While the climate crisis threatens all life, urban activities, urban growth, and sprawl continue to increase rapidly. However, the growth of urban areas within certain limits is a critical need for engineering and urban planning. For decision makers, spatially determining the limits of human intervention in nature is an important guideline. Extreme weather events and disasters such as floods, tsunamis, and changes in water levels brought about by climate change can potentially cause chaotic crises. Loss of life and economic crises may occur in possible processes. Therefore, measures must be taken on behalf of humanity and life to adapt to climate effects and keep the level of impact under control. Spatial models based on a wide range of temporal contexts have a structure that broadens our perspective. The study provides an approach that can be implemented in various fields with models produced based on scenarios.
A novel fixed point iteration process applied in solving the Caputo type fractional differential equations in Banach spaces
(2024.01.01) Okeke, G.A.; Ugwuogor, C.I.; Alqahtani, R.T.; Kaplan, M.; Ahmed, W.E.
We introduce the modified Picard-Ishikawa hybrid iterative scheme and establish some strong convergence results for the class of asymptotically generalized phi-pseudocontractive mappings in the intermediate sense in Banach spaces and approximate the fixed point of this class of mappings via the newly introduced iteration scheme. We construct some numerical examples to support our results. Furthermore, we apply the Picard-Ishikawa hybrid iteration scheme in solving the nonlinear Caputo type fractional differential equations. Our results generalize, extend and unify several existing results in literature.
Advanced NH3 Detection by 1D Nanostructured La:ZnO Sensors with Novel Intrinsic p-n Shifting and Ultrahigh Baseline Stability
(2024.01.01) Ajjaq, A.; Bulut, F.; Ozturk, O.; Acar, S.
Due to its stability, transportability, and ability to be produced using renewable energy sources, NH3 has become an attractive option for hydrogen production and storage. Detecting NH3 is then essential, being a toxic and flammable gas that can pose dangers if not properly monitored. ZnO chemiresistive sensors have shown great potential in real NH3 monitoring applications; yet, research and development in this area are ongoing due to reported limitations, like baseline instabilities and sensitivity to environmental factors, including temperature, humidity, and interferent gases. Herein, we suggest an approach to obtain sensors with competitive performance based on ZnO semiconducting metal oxides. For this purpose, one-dimensional nanostructured pure and La-doped ZnO films were synthesized hydrothermally. Incorporating large rare earth ions, like La, into the bulk lattice of ZnO is challenging and can lead to surface defects that are influential in gas-sensing reactions. The sensors experienced a temperature-induced p-n shifting at about 100 degrees C, verified by the Hall effect and AC impedance measurements. The doped sensor showed exceptional stepwise baseline stability and outstanding performance at a relatively low operating temperature (150 degrees C) with a sensing response of 91 at best (@ 50 ppm NH3) and recorded a tolerance to water vapor up to 70% RH. Alongside p-n shifting, the enhanced performance was discussed in correlation with La doping-triggered changes in the nanostructural and surfacial properties of the films. We validated the proposed technique by producing similar sensors and performing multiple replicates to ensure consistency and reproducibility. We also introduced the fill factor concept into the gas sensor field as a new trustworthy parameter that could improve sensor performance assessment and help rate sensors based on deviation from ideality.
Effects of using collagen and aloe vera grafted fibroin scaffolds on osteogenic differentiation of rat bone marrow mesenchymal stem cells in SBF-enriched cell culture medium
(2024.01.01) Mohamed, S.A.T.; Emin, N.
In the study, collagen and aloe vera were grafted onto silk fibroin with two different methods, and 3D-microporous scaffolds (1F5C4A1 and 2F5C4A1) were formed by lyophilization. Three osteogenic cultures were started by seeding rat bone marrow mesenchymal stem cells (MSCs) and pre-induced MSC (osteoblast (OB)) on biopolymeric scaffolds. The osteogenic medium was enriched with 10% (v/v) simulated body fluid (SBF) to promote mineralization and osteogenic differentiation in one of the MSC cultures and the OB culture. X-ray diffraction (XRD), scanning electron microscopy (SEM), scanning electron microscopy- energy dispersive spectrum (SEM-EDS) analyses on cellular samples and histochemical (alizarin red, safranin-O, alcian blue) and immunohistochemical (anti-collagen-1, anti-osteocalcin, anti-osteopontin) staining showed that bone-like mineralization was occurred by both chemically and cellular activity. In addition, pre-osteogenic induction of MSCs in 2D-cultured was found to promote osteogenesis more rapidly when started 3D-cultured. These results indicated that enrichment of the cell culture medium with SBF is sufficient for in vitro mineralization rather than using high concentrations of SBF. The findings showed that OB cells on the 2F5C4A1 scaffold obtained the best osteogenic activity. Still, other culture media with 10% SBF content could be used for bone tissue engineering under osteogenic induction.
Electrochemical, mechanical, and antibacterial properties of the AZ91 Mg alloy by hybrid and layered hydroxyapatite and tantalum oxide sol-gel coating
(2023.09.28) Albayrak, S.; Gul, C.; Emin, N.; Gokmen, U.; Karakoc, H.; Uzun, A.; Çinici, H.
The corrosion and bacterial behavior of AZ91 magnesium alloy coated with sol-gel-deposited amorphous tantalum oxide and hydroxyapatite have been investigated. The objective was to assess the potential suitability of AZ91 for permanent prosthesis applications. The coatings were applied in layered and hybrid configurations and characterized using various techniques including X-ray diffractometry, Fourier transform infrared spectroscopy, scanning electron microscopy/energy dispersive spectrometry, and drop analyses. The antibacterial properties were evaluated through interactions with Staphylococcus aureus and Escherichia coli strains. Mechanical properties and adhesion were determined via linear scratch tests, and electro-chemical corrosion tests were conducted in different media. The release of aluminum ions from the samples in Dulbec-co's Modified Eagle's Medium was monitored over 28 days. The findings revealed that the amorphous tantalum oxide coating, particularly in combination with hydroxyapatite, improved antibacterial properties and positively influenced corrosion and scratch resistance. The layered and hybrid coatings demonstrated the highest corrosion resistance. The release of aluminum ions remained within acceptable levels in the tested medium. Overall, the study provides valuable insights into the potential of sol-gel coatings on AZ91 for prosthetic applications, considering antibacterial behavior, corrosion resistance, and aluminum release.
Fair Trial for Transitional Justice : The Case of Belene Trial
(2023.01.01) Kocak, H.; Baklacioglu, N.O.
Inspired by the 32-years long Belene trial, the article investigates the impact of deprivation from the right to justice on reaching transitional justice in aftermaths of crimes against humanity. Through bottom-up victims-centered perspective the article digs into the Belene victims' oral history narratives to find out the impact of this deprivation on the societal contract, victims' trauma, justice perception of the society and the rule of law. Based on textual analysis of open-ended interviews and narratives of the Belene victims, the article highlights the adverse consequences of neglecting the victims' right to fair trial and transitional justice and perpetuating impunity, not only impeding justice and healing but perpetuating victimization and corroding societal trust. The sustained denial of victims' rights to a fair trial and access to justice exacerbates historical wounds, erodes the foundations of the justice and collective perception of fairness in the whole society. Beyond legal implications, the deprivation from right to justice affects individuals' psychological and social well-being and overall societal peace. The article emphasizes that transitional justice is a moral imperative, enabling the rebuilding of a peaceful and democratic society on principles of accountability and empathy, especially in the complex and sensitive aftermath of ethnicbased crimes against humanity.
Flexible capacitive and piezoresistive pressure sensors based on screen-printed parylene C/polyurethane composites in low-pressure range
(2023.01.01) Kurnaz, S.; Öztürk, Ö.; Mehmet, A.H.; Guduloglu, U.; Yılmaz, N.; Cicek, O.
The use of polymers to fabricate flexible pressure sensors as an alternative to conventional pressure sensors has led to the development of physiological monitoring of human body and the electronic skin. In particular, the fabrication of flexible capacitive and piezoresistive sensors using a variety of materials and the investigation of their electromechanical properties are further developments in these fields. Herein, parylene C is synthesized via chemical vapor deposition method. Pressure-sensitive inks are prepared with a composite of parylene C, polyurethane, polymethylmethacrylate, and activated carbon at certain weight ratios. Flexible capacitive and piezoresistive pressure sensors are fabricated by the screen printing method. The sensitivity, detection limit, linearity range, and response/relaxation time, which define the capacitive and piezoresistive properties are investigated and presented in this paper. The sensitivities of the flexible capacitive and piezoresistive pressure sensors are 0.124 kPa-1 and 0.074 kPa-1 in the pressure range of 0.07-1.39 kPa. This study enables parylene C to be used in the composite structure and shows that it can be used not only as a protective layer but also in flexible pressure sensor applications. It also ensures that the design of the flexible capacitance pressure sensor can measure low pressure with high sensitivity compared to the flexible piezoresistive pressure sensor.
IMPROVING THERMAL AND ELECTRICITY GENERATION PERFORMANCE OF PHOTOVOLTAIC/THERMAL (PV/T) SYSTEMS USING HYBRID NANOFLUID
(2024.01.01) Swese, E.E.O.; Sözen, A.; Rezaeizadeh, R.; Hançerliogullari, A.; Aytaç, I.; Variyenli, H.I.; Çakir, M.T.
Solar energy is a safe and clean source of energy, available on the Earth throughout the year. A photovoltaic/thermal (PV/T) system is a device designed to take solar energy and convert it into electrical/thermal energy. Photovoltaic/ thermal systems can also be useful to produce hot fluid (usually water) along with the generation of electrical energy. In addition, the electric generating performance of PVs increases with heat discharging ability of thermal system, which also prevents overheating in PV systems. Nanofluid is a new generation heat transfer fluid that delivers higher thermal conductivity and heat transfer rate compared to conventional fluids. The thermal conductivity of the nanofluid depends on the size of the nanoparticles, concentration of the nanofluid, and the method of its preparation. In this study, it is aimed to increase the thermal heat transfer of the PV/T system by using hybrid nanofluids, manufactured by adding 0.5% Fe2O3 and Fe3O4 nanoparticles to the water as a working fluid. By using hybrid nanofluids, increase in bidirectional performance along with enhanced cooling is achieved. In the experimental study, more heat was withdrawn from the heated PV panels by utilizing the high thermal conductivity of the hybrid nanofluid, and the best improvement in total efficiency was obtained as 86% for the hybrid nanofluid. With the use of hybrid nanofluids in the cooling circuit, the electrical and thermal efficiency of the PV panel has reached to overall 81% on average basis.
Is Geopolitical Risk a Reason or Excuse for Bigger Military Expenditures?
(2024.01.01) Tutuncu, A.; Bayraktar, Y.; Khan, K.
This study aims to investigate the relationship between military expenditures and geopolitical risk using the Panel Fourier Toda-Yamamoto Causality test over the 1993-2020 period. Considering structural changes, the findings reveal that geopolitical risk fluctuations in Colombia, India, South Korea, Russia, Saudi Arabia, Ukraine, and the USA affect military expenditures. Conversely, the results point out that for Chile, Israel, Russia, Taiwan, and the UK, military expenditures appear to cause geopolitical risk. This highlights that changes in military spending across nations trigger an arms race due to the perception of increased threat by neighbours and/or interest groups. In a nutshell, the results show a complex interplay between military expenditures and geopolitical risk, where changes in one can affect the other. Based upon this, policymakers must prioritize diplomacy, utilize international mediation/peacekeeping initiatives, develop military alliances, and commit to non-threatening military expenditures for regional stability.
Molecular simulation of (Al-Ga) surface garnished with chromium metal for organic material detecting: A DFT study
(2023.01.01) Mollaamin, F.; Monajjemi, M.
Al-Ga surface doped with chromium (Cr) is theoretically studied using first-principles density functional theory (DFT) at the CAM-B3LYP/EPR-III, LANL2DZ, 6-31+G(d,p) level of theory to explore the chemical adsorption and corrosion inhibition of organic carbenes through coating process. Crystal structure of Cr-(Al-Ga) surface was coated by S-&N-heterocyclic carbenes of benzotriazole (BTA), 2-mercaptobenzothiazole (2MBT), 8-hydroxyquinoline (8HQ) and 3-amino-1,2,4-triazole-5-thiol (ATR). The NMR spectroscopy of the adsorption of BTA, 2MBT, 8HQ, and ATR on the Cr-doped Al-Ga nanoalloy surface represents that this surface can be employed as the magnetic S-&N-heterocyclic carbene sensors. In fact, Cr site in Cr-(Al-Ga) nanoalloy surface has bigger interaction energy amount from Van der Waals' forces with BTA, 2MBT, 8HQ, and ATR that might cause them large stable towards coating data on the nanosurface. It has been estimated that the criterion for choosing the surface linkage of S and N atoms in BTA, 2MBT, 8HQ, and ATR in adsorption sites can be impacted by the existence of close atoms of aluminum and gallium in the Cr-(Al-Ga) surface. The fluctuation of NQR has estimated the inhibiting role of BTA, 2MBT, 8HQ, and ATR for Cr -doped Al-Ga alloy nanosheet due to S and N atoms in the benzene cycle of heterocyclic carbenes being near the monolayer surface of ternary Cr-(Al-Ga) nanoalloy. Moreover, IR spectroscopy has exhibited that Cr-doped Al-Ga alloy nanosheet with the fluctuation in the frequency of intra-atomic interaction leads us to the most considerable influence in the vicinage elements generated due to inter-atomic interaction. Comparison to Delta Delta G(ads)(degrees) amounts versus dipole moment has illustrated a proper accord among measured parameters based on the rightness of the chosen isotherm for the adsorption steps of the formation of BTA @ Cr-(Al-Ga), 2MBT @ Cr-(Al-Ga), 8HQ @ Cr-(Al-Ga), and ATR @ Cr-(Al-Ga) complexes. Thus, the interval between sulfur, nitrogen, and oxygen atoms in BTA, 2MBT, 8HQ, and ATR during interaction with transition metal of Cr in Cr-(Al-Ga) nanoalloy, (N ->-> Cr, O ->-> Cr, S ->-> Cr), has been estimated with relation coefficient of R-2 = 0.9509. Thus, this paper exhibits the influence of Cr doped on the "Al-Ga" surface for adsorption of S-&N-heterocyclic carbenes of BTA, 2MBT, 8HQ, and ATR by using theoretical methods. Furthermore, the partial electron density or PDOS has estimated a certain charge assembly between Cr-(Al-Ga) and S-&N-heterocycles of BTA, 2MBT, 8HQ, and ATR which can remark that the complex dominant of metallic features and an exact degree of covalent traits can describe the augmenting of the sensitivity of Cr-(Al-Ga) surface as a potent sensor for adsorption of BTA, 2MBT, 8HQ, and ATR heterocycles. This work investigates the characteristics, band structure, and projected density of state (PDOS) of Al-Ga nanoalloy doped with Cr element for increasing the corrosion inhibition of the surface through adsorption of organic molecules of carbenes in the surface coatings process. This paper can be helpful in a range of applications which uses Al-Ga alloy for the study of energy storage and adsorption of air pollution or water contamination. Many different approaches such as surface coatings, alloying, and doping can be adopted to protect the surface.
Nonlinear vibration analysis of fluid-conveying cantilever graphene platelet reinforced pipe
(2024.01.01) Ali, B.M.; Akkas, M.; Hançerliogullari, A.; Bohlooli, N.
This paper is motivated by the lack of studies relating to vibration and nonlinear resonance of fluid -conveying cantilever porous GPLR pipes with fractional viscoelastic model resting on nonlinear foundations. A dynamical model of cantilever porous Graphene Platelet Reinforced (GPLR) pipes conveying fluid and resting on nonlinear foundation is proposed, and the vibration, natural frequencies and primary resonant of such system are explored. The pipe body is considered to be composed of GPLR viscoelastic polymeric pipe with porosity in which Halpin -Tsai scheme in conjunction with fractional viscoelastic model is used to govern the construction relation of the nanocomposite pipe. Three different porosity distributions through the pipe thickness are introduced. The harmonic concentrated force is also applied on pipe and excitation frequency is close to the first natural frequency. The governing equation for transverse motion of the pipe is derived by the Hamilton principle and then discretized by the Galerkin procedure. In order to obtain the frequency -response equation, the differential equation is solved with the assumption of small displacement, damping coefficient, and excitation amplitude by the multiple scale method. A parametric sensitivity analysis is carried out to reveal the influence of different parameters, such as nanocomposite pipe properties, fluid velocity and nonlinear viscoelastic foundation coefficients, on the primary resonance and linear natural frequency. Results indicate that the GPLs weight fraction porosity coefficient, fractional derivative order and the retardation time have substantial influences on the dynamic response of the system.
Novel asymmetric biscarbothioamides as Alzheimer's disease associated cholinesterase inhibitors: synthesis, biological activity, and molecular docking studies
(2024.01.01) Muglu, H.; Yakan, H.; Erdogan, M.; Topal, F.; Topal, M.; Turkes, C.; Beydemir, S.
Exploring novel frameworks for treating Alzheimer's disease is an ambitious objective. In this particular context, a range of asymmetric biscarbothioamide derivatives (3a-l) with varying substitutions have been meticulously designed and effectively synthesized. The newly synthesized compounds have all been definitively characterized using established spectroscopic techniques such as 1H-NMR, 13C-NMR, FT-IR, and elemental analysis. In vitro, all the derivatives (3a-l) were evaluated to assess their inhibitory potential against cholinesterase enzymes (acetylcholinesterase, AChE, and butyrylcholinesterase, BChE). The outcomes demonstrated that these derivatives were potent and exhibited selectivity in inhibiting AChE, except for compounds 3b and 3e, which specifically inhibited BChE, showcasing varying degrees of KI values. Significantly, compounds 3j (KIs of 11.91 +/- 2.25 nM for AChE and 77.76 +/- 8.02 nM for BChE) and 3h (KIs of 14.73 +/- 2.30 nM for AChE and 59.54 +/- 6.20 nM for BChE) emerged as the most potent dual inhibitors of AChE and BChE within the series, respectively, with KI constants even lower than those of the standard drug tacrine (KIs of 68.70 +/- 5.39 nM for AChE and 111.60 +/- 10.52 nM for BChE). Furthermore, their potential scavenging activity against DPPH and ABTS radicals was evaluated. To further validate the experimental findings, molecular docking studies were performed in silico to ascertain the binding modes of these compounds with the active pockets of AChE and BChE enzymes. Investigating innovative frameworks for addressing Alzheimer's disease is a challenging goal. In this specific scenario, a selection of asymmetric biscarbothioamide derivatives (3a-l) with different substitutions has been carefully formulated and successfully synthesized.
The Interconnection Between Workplace Incivility, Religiosity and Employees' Psychological Well-Being: An Update of the Conservation of Resources Theory
(2024.01.01) Abualigah, A.; Koburtay, T.; Syed, J.; Arici, H.E.; Aboramadan, M.
Drawing upon the conservation of resources (COR) theory, this study contextually examines the relationship between workplace incivility and employees' psychological wellIP 203 8 109 20 On: Tue 23 Apr 2 being, and the moderating effect of religiosity on this Delivered by I genta relationship. Following a quantitative approach, data were collected from 199 employees from different service industries in Jordan and the hypotheses were tested with partial least squares -structural equation modelling (PLSSEM) using SmartPLS 3.3.3. The findings show that workplace incivility negatively affects employees' psychological well-being, and intrinsic religiosity buffers this adverse effect. Our study brings to fore the concept of religiosity, an important yet neglected personal resource. The findings extend the notion of COR theory through capturing the linkages between the focal constructs, thus contributing to the literature through demonstrating that intrinsic religiosity, as a boundary condition, buffers the adverse effect of workplace incivility on employees' wellbeing. The study highlights in closing an array of future research directions.
Theoretical Structure of Circular Intuitionistic Fuzzy C Control Charts
(2024.01.01) Sentürk, S.; Gökkus, Z.; Atalik, G.; Ince, N.; Yazicioglu, A.Ö.
The fuzzy control charts are available tools for monitoring and evaluating the process, if the process includes vagueness. The main contribution of fuzzy control charts is to provide flexibility to the control limits. In the literature, there are many fuzzy control charts that conducted using various fuzzy numbers. In this paper, the statistical base of circular intuitionistic fuzzy c control charts were being proposed to the literature for the first time. In addition, an application was executed on a data set, and results were interpreted.
Use of Immunoglobulin Y Antibodies: Biosensor-based Diagnostic Systems and Prophylactic and Therapeutic Drug Delivery Systems for Viral Respiratory Diseases
(2024.01.01) Budama-Kilinc, Y.; Kurtur, O.B.; Gok, B.; Cakmakci, N.; Kecel-Gunduz, S.; Unel, N.M.; Ozturk, T.K.
Respiratory viruses have caused many pandemics from past to present and are among the top global public health problems due to their rate of spread. The recently experienced COVID-19 pandemic has led to an understanding of the importance of rapid diagnostic tests to prevent epidemics and the difficulties of developing new vaccines. On the other hand, the emergence of resistance to existing antiviral drugs during the treatment process poses a major problem for society and global health systems. Therefore, there is a need for new approaches for the diagnosis, prophylaxis, and treatment of existing or new types of respiratory viruses. Immunoglobulin Y antibodies (IgYs) obtained from the yolk of poultry eggs have significant advantages, such as high production volumes, low production costs, and high selectivity, which enable the development of innovative and strategic products. Especially in diagnosing respiratory viruses, antibody-based biosensors in which these antibodies are integrated have the potential to provide superiority in making rapid and accurate diagnosis as a practical diagnostic tool. This review article aims to provide information on using IgY antibodies in diagnostic, prophylactic, and therapeutic applications for respiratory viruses and to provide a perspective for future innovative applications.

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