Sürdürülebilir Kalkınma Amaçları
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- MakaleYalnız künye2026Evaluation of Factors Affecting Innovation in Developed and Developing Countries by MCDM
Salad, Liban Daud; Seyhan, Nazll
This study comparatively analyzes the economic, social, and technological factors determining the innovation performance of developed and developing countries within a holistic multi-criteria decision-making (MCDM) framework, using data from 2013 and 2021. The criterion weights determined by CRITIC and SWARA, and the WEDBA results, indicate a significant structural shift between the periods. In developed countries, R&D expenditures, patent production, and intellectual property protection are key determinants of innovation performance; while in developing countries, digital infrastructure, human capital, and education investments stand out. The findings reveal that innovation policies based on strategic priorities specific to country groups are more effective.
- MakaleYalnız künye2023Influences of Wall Configurations on Earthquake Behavior of Cantilever Retaining Walls Considering Soil-Structure Interaction Effects
Ozturk, Kasif Furkan; Cakir, Tufan; Araz, Onur
Cantilever walls are frequently and necessarily built not only in earthquake prone regions but also on different foundation subsoils with various physical and mechanical characteristics. The response of these structures is a complicated soil-structure interaction (SSI) problem, in which the relative stiffness between the soil and structure is of critical importance. In addition to different soil conditions and earthquake motions, the wall configurations have an important role in the cantilever retaining wall design. Thus, the major objective of this work is to investigate the effects of various configurations on seismic response of the cantilever retaining walls considering SSI. Accordingly, the seismic response of the interaction systems is revealed using the 3D finite element models (FEM) in time domain, assuming linearly elastic behavior for the wall, and elastoplastic behavior for backfill and foundation soil. Viscous absorbent boundaries are employed to both simulate radiation scenario and avoid undesirable wave reflections generated by soil lateral boundaries. Backfill-wall interfaces are modeled using the unidirectional interface elements with nonlinear force-deflection abilities. The interaction systems are analyzed considering three different cantilever wall configurations (inverted T-type, L-type, and the wall with a base key), four different ground motion records, and four different subsoil systems. Nonlinear seismic analyses are carried out to visit how considering the variation of these parameters influences the wall behavior. The results from parametric studies show that the wall configuration, SSI effects and ground motions are remarkably influential on seismic responses of the cantilever walls such as the stresses and horizontal displacements.
- MakaleYalnız künye2023The Darboux trihedrons of timelike surfaces in the Lorentzian 3-space
Li, Yanlin; Mazlum, Sümeyye Gür; Aenyurt, Süleyman
The parameter curves (c1) and (c2) intersecting under the angle on a timelike surface and any curve (c) passing through the same point with these curves have six different cases according to their causal characters. In this study, the Darboux trihedrons of these three curves and the Darboux instantaneous rotation vectors of these trihedrons are separately calculated for each of these six cases, and the relationships between these vectors are given. In addition, some theorems and results have been obtained on this surface. Besides, the special cases where the parameter curves (c1) and (c2) intersect perpendicularly are examined and these cases are compared with previous studies.
- MakaleYalnız künye2022The Effect of Surface Morphology of Silver Nanoparticles on the Selectivity of Styrene Epoxidation
Sarlblylk, Oǧuz Yunus
Catalytic materials at the nanoscale level have an enormous impact on sustainable environmental protection, which is important for the future. Therefore, the researchers will intensively carry out the design of catalytic materials with well-ordered surface structures. In more detail, morphology-controlled nanoparticles have special interactions with the reactants that increase catalytic performance and influence the selectivity for catalytic reactions. For those reasons, obtaining specifically surface structure-tuned nanocrystals having different surface arrangements is a significant priority that promises the best model relationship between well-oriented surface structure and catalytic performance. In this study, silver nanocrystals shaped with cubes, truncated octahedrons, and octahedrons were produced. Their catalytic behaviors were examined as an innovation for epoxidation/oxidation reactions of styrene in mild conditions. The morphological and surface characterizations of nanocrystals were determined by analytical and instrumental methods such as high-resolution transmission electron microscopy energy dispersive X-ray (HR-TEM-EDX), X-ray diffraction (XRD), as well as inductively coupled plasma mass spectroscopy optical emission spectrometry (ICP-OES), and gas chromatography-mass spectrometry (GC-MS). According to the results, nanoparticles having different surface-facets fractions can be employed to increase the selectivity of styrene epoxide.
- DergiJournal of Earthquake and Tsunami
- DergiInternational Journal of Innovation and Technology Management
- DergiInternational Journal of Geometric Methods in Modern Physics
- DergiNano