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    Gene expression programming based formulations for splitting tensile strength of concrete
    (ELSEVIER SCI LTD, 2012) Ozcan, Fatih
    In this study, gene expression programming (GEP) formulations for splitting tensile strength (f(spt)) of the cylinder specimens with 150 mm diameter and 300 mm height using compressive strength (f(c)) of concrete cube specimens with 150 mm dimension are developed. Two models, called as GEP-I and GEP-II, are developed for predicting f(spt) by using GEP. The database used in the GEP models is based on experimental data obtained from literature. In the GEP-I model, while f(c) is used as input variable, f(spt) is used as output variable. However, in the GEP-II model, as well as f(c), water-binder ratio (WB) is used as input variables. The data sets used in training and testing stages are randomly selected among all experimental data. The GEP formulations are also validated with additional experimental data other than the data used in training and testing sets of the GEP models. Experimental f(spt) results of concrete specimens are compared with GEP formulations, proposed formulations by some national building codes and the developed regression-based formulation results. The results show that GEP formulations have strong potential as a feasible tool for prediction of the f(spt) from only 150 mm cube f(c) or WB and 150 mm cube f(c) of concrete. (C) 2011 Elsevier Ltd. All rights reserved.
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    Humic-makeup approach for simultaneous functionalization of polyacrylonitrile nanofibers during electrospinning process, and dye adsorption study
    (TAYLOR & FRANCIS INC, 2016) Gezici, Orhan; Guven, Idris; Ozcan, Fatih; Ertul, Seref; Bayrakci, Mevlut
    A useful methodology is represented to functionalize polyacrylonitrile nanofibers by using humic acid as a makeup agent in electrospinning process. Both morphology and surface chemistry of polyacrylonitrile nanofiber mats were understood to be influenced by incorporation of humic acid into the structure. Physicochemical changes were evidenced by Fourier transform infrared spectroscopy, scanning electron microscope, and surface charge measurements. Unlike some anionic dyes (i.e., methyl orange, methyl red, and Congo red), there was an enhancement in crystal violet (a cationic dye) adsorption after incorporation of humic acid. The Langmuir model fitted well to crystal violet data, and monolayer adsorption capacity was calculated as 81.6 mg/g (r(2) = 0.998).