Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 24Citation - Scopus: 86A Dirac-Semimetal Two-Dimensional Ben4: Thickness-Dependent Electronic and Optical Properties(AIP Publishing LLC, 2021) Bafekry, A.; Stampfl, C.; Faraji, M.; Yağmurcukardeş, Mehmet; Fadlallah, M. M.; Jappor, H. R.; Ghergherehchi, M.Motivated by the recent experimental realization of a two-dimensional (2D) BeN4 monolayer, in this study we investigate the structural, dynamical, electronic, and optical properties of a monolayer and few-layer BeN4 using first-principles calculations. The calculated phonon band dispersion reveals the dynamical stability of a free-standing BeN4 layer, while the cohesive energy indicates the energetic feasibility of the material. Electronic band dispersions show that monolayer BeN4 is a semi-metal whose conduction and valence bands touch each other at the Sigma point. Our results reveal that increasing the layer number from single to six-layers tunes the electronic nature of BeN4. While monolayer and bilayer structures display a semi-metallic behavior, structures thicker than that of three-layers exhibit a metallic nature. Moreover, the optical parameters calculated for monolayer and bilayer structures reveal that the bilayer can absorb visible light in the ultraviolet and visible regions better than the monolayer structure. Our study investigates the electronic properties of Dirac-semimetal BeN4 that can be an important candidate for applications in nanoelectronic and optoelectronic. Published under an exclusive license by AIP Publishing.Article Citation - WoS: 37Citation - Scopus: 62Suppression of Excited States Relative To the Ground State in Pb-Pb Collisions at S Nn = 5.02 Tev(American Physical Society, 2018) CMS Collaboration; Karapınar, GülerThe relative yields of mesons produced in pp and Pb-Pb collisions at sNN=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, (2S) and (3S), to the ground state, (1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [(nS)/(1S)]Pb-Pb/[(nS)/(1S)]pp, are measured to be 0.308±0.055(stat)±0.019(syst) for the (2S) and less than 0.26 at 95% confidence level for the (3S). No significant (3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as transverse momentum and rapidity. No significant dependencies are observed.Article Citation - WoS: 33Citation - Scopus: 35Henry's Law Constant, Octanol-Air Partition Coefficient and Supercooled Liquid Vapor Pressure of Carbazole as a Function of Temperature: Application To Gas/Particle Partitioning in the Atmosphere(Elsevier Ltd., 2006) Odabaşı, Mustafa; Çetin, Banu; Sofuoğlu, AysunThe Henry's law constant for carbazole was experimentally determined between 5 and 35°C using a gas-stripping technique. The following equation was obtained for dimensionless Henry's law constant (H′) versus temperature (T, K):lnH′=-3982(T,K)-1+1.01 Temperature-dependent octanol-air partition coefficients (KOA) and supercooled liquid vapor pressures (PL, Pa) of carbazole were also determined using the GC retention time method. The temperature dependence of KOA and PL were explained by the following:logKOA=4076/(T,K)-5. 65logPL(Pa)=-3948(T,K)-1+11.84 The gas and particle-phase carbazole concentrations measured previously in Chicago, IL in 1995 was used for gas/particle partitioning modeling. Octanol based absorptive partitioning model consistently underpredicted the gas/particle partition coefficients (K p) for all sampling periods. However, overall there was a good agreement between the measured Kp and soot-based model predictions.