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    Effects of Electrolytes on Interfacial and Micelle Properties of C.I. Reactive Orange 16 - Dodecylpyridinium Chloride Binary System
    (Carl Hanser Verlag, 2011) Akbas, H.; Aydemir, M.
    The effect of electrolytes on the interaction between the anionic dye C.I. Reactive Orange 16 and the cationic surfactant dodecylpyridinium chloride was investigated using surface tension measurement in a certain concentration range. The influence of the concentration of electrolyte on critical micelle concentration (CMC) values was observed in the following order; 0.1 M NaCl > 0.5 M NaCl > 1.0 M NaCl. Also, the influence of the electrolyte cations was observed as Na+ > Mg2+ > K+. An increase on CMC values of dye-surfactant solution with increasing electrolyte concentration is explained as charge screening and also the decrease in these values for higher concentration of electrolyte is attributed to the change of micelle shape. Furthermore this change is due to ionic polarizability, valency and hydrated radius. Using Rubingh's regular solution theory, the values of micellar interaction parameters (beta), were found as negative in all studied mixtures.
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    Next-Generation Infrastructure and Technology Issues in 5G Systems
    (Croatian Communications & Information Soc, 2018) Cengiz, K.; Aydemir, M.
    Next-generation technologies are being tried to develop for 5G wireless cellular networks nowadays by many researchers. Some key technologies provide significant improvements for 5G systems in terms of huge capacity, higher data rate, signaling overhead on the network and energy-spectral efficiency. But these technologies also bring along critical issues for 5G systems. In this paper, these major problems of 5G networks are discussed in terms of scarcity radio frequency spectrum, interantenna synchronization, antenna deployments in cells, network and traffic management, cost and workload. Also these challenges are expressed, presented and discussed in each section to provide prior knowledge and perspective for 5G network designers and researchers.