Abstract. In a lossy media, anisotropic chiral metamaterial (MTM) structures with normal incidence asymmetric transmission of linearly polarized electromagnetic (EM) waves are investigated and analyzed in both microwave and terahertz frequency regimes. The proposed lossy structures are used to perform dynamic polarization rotation and consist of square-shaped resonators with gaps on both sides of dielectric substrates with a certain degree of rotation. Asymmetric transmission of a linearly polarized EM wave through the chiral MTMs is realized by experimental and numerical studies. The dynamic structures are adjustable via various parameters to be tuned for any desired frequency regimes. From the obtained results, the suggested structure can be used to design new polarization control devices for desired frequency regimes. © The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Adsorption of copper (II) ions to untreated peanut hulls and untreated Pinus brutia sawdust was investigated as a function of the contact time, amount of adsorbents, initial pH, temperature and initial metal ion concentration. Adsorption efficiency was increased by increasing contact time, amount of adsorbents and decreasing initial metal ion concentration. The optimum adsorption conditions were obtained at pH 5.0. Experimental results indicate that peanut hulls are a more effective adsorbent than Pinus brutia sawdust for the removal of Cu (II) from aqueous solutions. The isothermal data of peanut hulls could be well described by the Langmuir and Freundlich equations.

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