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    Dehydration kinetics of tincal and borax by thermal analysis
    (Amer Chemical Soc, 1997) Ekmekyapar, A; Baysar, A; Kunkul, A
    The dehydration reaction kinetics of tincal and-borax decahydrate was investigated by thermogravimetry (TG) and differential thermal analysis (DTA). Various methods were used to analyze the TG and DTA data for determination of reaction kinetics. The activation energy, frequency factor, and order of reaction were calculated for both materials. The results obtained from different methods were generally in good agreement. The results of tincal and borax were also compatible.
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    Determination of free malondialdehyde in human serum by high-performance liquid chromatography
    (Academic Press Inc Elsevier Science, 2002) Karatas, F; Karatepe, M; Baysar, A
    Lipid peroxidation involves the oxidative deterioration of polyunsaturated fatty acids in biomembranes and generates a variety of aldehydic products including malondialdehyde (MDA). To demonstrate the occurrence of lipid peroxidation in biological systems, the production of MDA has been shown to be a relevant indicator. Therefore, we describe a new method for measurement of free malondialdehyde in human serum. A simple, rapid but sensitive method for determination of MDA in human serum was applied to goiter patients and control groups. Patients with goiter had high levels of MDA compared to control groups. Our method is fast and practical for clinical measurements, The detection limit was found to be 1.2 x 10(-8) mol L-1. (C) 2002 Elsevier Science (USA). All rights reserved.
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    Dissolution kinetics of ulexite in ammonium sulfate solutions
    (Amer Chemical Soc, 2003) Künkül, A; Demirkiran, N; Baysar, A
    The dissolution kinetics of ulexite in ammonium sulfate solutions was investigated. The effects of ammonium sulfate concentration, particle size, solid/liquid ratio, stirring speed, and reaction temperature on the dissolution rate have been evaluated. It was found that the dissolution rate increased with increasing ammonium sulfate concentration, stirring speed, and reaction temperature. However, increasing the particle size and solid/liquid ratio decreased the dissolution rate. Experimental data were examined by the heterogeneous and homogeneous models. The heterogeneous diffusion-controlled ash or product layer may describe the dissolution rate. The following mathematical model was used to represent the reaction kinetics: 1 - 3(1 - X)(2/3) + 2(1 - X) = 3.9 x 10(7) (CD-0.85)-D-0.64(S/L)(-1.06)omega(0.40)e(-10050/T)t, where X is the fractional conversion, C the ammonium sulfate concentration, D the particle size, S/L the solid-to-liquid ratio, omega the stirring speed, T the reaction temperature, and t the reaction time.
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    Effect of drying methods on functional properties of tarhana: A wheat flour-yogurt mixture
    (Wiley-Blackwell, 2002) Hayta, M; Alpaslan, M; Baysar, A
    Changes in functional and sensory properties of tarhana prepared by different drying methods were investigated. While tunnel-dried (TD) tarhana had significantly (P < 0.05) higher foaming capacity compared to freeze-dried (FD), home-microwave-oven-dried (HMD) and industrial-microwave-dried (IMD) samples, the FD tarhana showed the highest protein solubility All tarhana samples exhibited pseudoplastic behavior described by power-law model. The drying methods used appeared to influence water and oil absorption capacities and emulsifying activity of tarhana. Microwave-dried tarhana exhibited higher overall sensory rating and color acceptability.
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    Physicomathematical analysis of surface modification of polymers by glow discharge in SF6+N2 medium
    (Elsevier, 2005) Alisoy, HZ; Baysar, A; Alisoy, GT
    In this paper, surface modification of dielectric polymers, having different physical and chemical properties (polyimide-PI, polystyrene-PS, Polyethylene terephthalate-PET), treated in contourized glow discharge in SF6 + N-2 gas medium near cathode was studied. The electret state, formed as a result of modification, caused an increase in the surface energy. Surface charge densities and contact angles of dielectric polymers whose surfaces were activated under identical conditions, were measured. Upon activation, formation of electret state on the dielectrics strained the sessile drop and consequently the contact angle changed. A mathematical model relating the contact angle and the surface charge density was derived. Experimental results agreed well with the theoretical model. (c) 2005 Published by Elsevier B.V.