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    Contact toxicity of six plant extracts to different larval stages of colorado potato beetle (Leptinotarsa decemlineata say (col: chrysomelidae)) [Altı bitki ekstraktının patates böceğinin (leptinotarsa decemlineata say (col: chrysomelidae)) farklı dönemlerdeki larvaları üzerine kontakt etkileri]
    (Ankara University, 2017) Alkan M.; Gökçe A.; Kara K.
    Discovery of new eco-friendly methods for insect pest management is very important in integrated pest management program. Contact toxicity of six plant extracts i.e. Acanthus dioscoridis L. (Acanthaceae), Achillea millefolium L. (Asteraceae), Bifora radians Bieb. (Apiaceae), Heracleum platytaenium Boiss (Apiaceae), Humulus lupulus L. (Cannabaceae) and Phlomoides tuberosa (L.) Moench (Lamiaceae), were tested on the 1st to 4th instar larvae of Colorado potato beetle (Leptinotarsa decemlineata Say. (Coleoptera: Chrysomelidae)). The H. platytaenium and H. lupulus extracts were the most effective among the tested extracts, so dose-response bioassay was carried out only with H. lupulus and H. platytaenium against larval stages of Colorado potato beetle. The H. platytaenium extract was the most effective extract with calculated LD50 values 0.126, 0.204, 0.206 and 0.458 µL insect-1, LD90 values were calculated as 0.345, 0.342, 0.402, 0.566 µL insect-1 for 1st, 2nd, 3rd and 4th instars larvae respectively. These results indicate that H. platytaenium and H. lupulus extracts have great potentials as insecticides in the management of larvae of L. decemlineata. © 2017, Ankara University. All rights reserved.
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    Experimental Research and Mathematical Modeling of Parameters Effecting on Cutting Force and SurfaceRoughness in CNC Turning Process
    (Institute of Physics Publishing, 2018) Zeqiri F.; Alkan M.; Kaya B.; Toros S.
    In this paper, the effects of cutting parameters on cutting forces and surface roughness based on Taguchi experimental design method are determined. Taguchi L9 orthogonal array is used to investigate the effects of machining parameters. Optimal cutting conditions are determined using the signal/noise (S/N) ratio which is calculated by average surface roughness and cutting force. Using results of analysis, effects of parameters on both average surface roughness and cutting forces are calculated on Minitab 17 using ANOVA method. The material that was investigated is Inconel 625 steel for two cases with heat treatment and without heat treatment. The predicted and calculated values with measurement are very close to each other. Confirmation test of results showed that the Taguchi method was very successful in the optimization of machining parameters for maximum surface roughness and cutting forces in the CNC turning process. © Published under licence by IOP Publishing Ltd.
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    Fast and simple analytical expressions for quasistatic parameters of asymmetric coplanar lines
    (1995) Karpuz C.; Görür A.; Görür H.; Alkan M.
    Fast and simple CAD-oriented analytical expressions for the characteristic impedance and the effective permittivity of asymmetric coplanar waveguides and coplanar strip lines are derived using the conformal mapping method. It has been found that the results calculated using analytical expressions obtained in the present article are in very good agreement with the analytical and experimental results given in the literature. The formulas derived in this study have also been verified to be valid for symmetric coplanar waveguide and strip lines. © 1995 John Wiley & Sons, Inc. Copyright © 1995 Wiley Periodicals, Inc., A Wiley Company
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    Springback evaluation of 5052-H32 aluminum-magnesium alloy
    (Hanrimwon Publishing Co., 2008) Alkan M.; Ozturk F.; Toros S.; Kilic S.
    Springback is one of the most common problems in sheet metal forming operation. It causes improper fit which creates serious problems during assembly of the parts. Based on material strength, a considerable elastic recovery during unloading can be observed. In the present study, the springback evaluation of 5052-H32 aluminum magnesium alloy sheets with a thickness of 1.5 mm was investigated using 60o angle V-shape die at several temperatures range of room to 300°C and strain rate range of 25-625 mm/min. Although the springback of the material was increased with increasing the temperature up to 200°C, it was decreased for all deformation speeds at 300°C. Bending force of the material was not changed with deformation speeds except for 300°C. The bending force was obtained at 625 mm/min is higher than the other deformation speeds. The best bending condition of this material was obtained at 300°C and 25 mm/min.