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Articles by Ahmet Tutus
Total Records ( 2 ) for Ahmet Tutus
  Abdullah Emin Akay , Orhan Erdas Mehmet Kanat and Ahmet Tutus
  The volume and economic value of the fire-killed and fire-damaged timber can dramatically decrease due to the impacts of deterioration agents after fire. Insect and stain fungi damages cause significant reductions in economic value of timber especially in the first year after fire. The fire-killed and fire-damaged trees should be quickly extracted to recover their economic values. The logging cost is the main factor that affects the net value of the trees after fire. Therefore, logging system should be carefully planned to maximize the net value recovered from the fire-killed and fire-damaged trees. In this study, the cost efficiency of ground-based logging systems in extracting fire-killed and fire-damaged trees was analyzed in a partially burned Brutian Pine (Pinus brutia) forest, located in Kahramanmaras. Besides, to select the optimum skidding distance with minimum logging costs, the logging systems were examined with respect to various skidding distances and associated forest road lengths.
  Ahmet Tutus
  In this study, 9 one-stage hydrogen peroxide bleaching trials were carried out to obtain high brightness levels in oxide added soda-oxygen-anthraquinone rice straw pulps of 52.4% (Elrepho) initial brightness. The results indicated that optimum oxide added soda-oxygen-anthraquinone rice straw pulp bleaching conditions were as follows: Hydrogen peroxide (H2O2) ratio on oven dry (o.d) pulp: 2-4%, Alkali (NaOH) charge on o.d pulp: 1.5-3%, Na2SiO3 ratio on o.d pulp: 3%, MgSO4 ratio on o.d pulp: 0.5%, EDTA ratio on o.d pulp: 0.5%, reaction temperature: 70°C, reaction time: 70 min. and concentration: 16%. Brightness, breaking length, burst and tear index of rice straw pulps bleached with H2O2 were found to be 23.32, 8.05, 10.97 and 23.69%, respectively, higher than those of unbleached rice straw pulps. Yellowness decreased from 314.85 to 218.481 elrepho.
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