2019 Cilt 13 Sayı 37

Permanent URI for this collectionhttps://hdl.handle.net/11452/20511

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Mathematical modeling of ultrasound pretreated carrot slices
(Bursa Uludağ Üniversitesi, 2019-03-20) Polat, Ahmet; İzli, Nazmi; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü
In this study, the effects of ultrasound pretreatment, air drying temperature and slice thickness on the drying kinetics of carrot were analyzed. Ultrasound pretreatments were applied to carrot samples of different slice thicknesses with for 0 (control), 20 and 40 minutes. All products were dried in the convection oven with constant air speed 1 m s-1 . The drying times varied from 260 to 110 minutes depending on the varying slice thicknesses, temperatures and the applied ultrasound pretreatments. In order to determine a suitable thin layer model for drying applications, 10 different mathematical models were fitted to the experimental results. The model was selected as the best model with the highest value of R 2 (Regression coefficient), lowest RMSE (Root mean square error) and χ2 (Chi-square). As a result of the statistical evaluation, it was determined that the Midilli et al. model is the most suitable model for explaining the convective drying characteristics of carrot according to other models. Consequently, ultrasound pretreatment can be used as a favorable method for reducing the drying time of the carrots in the convective process.
A research on the meet of energy needs in broiler plant with solar panels
(Bursa Uludağ Üniversitesi, 2019-03-20) Erden, Sena; Aydin, Merve; Taşkın, Onur; Vardar, Ali; Ziraat Fakültesi; Biyosistem Mühendisliği Bölümü
One of the biggest problems of today's enterprises is the high-value electricity costs. In order to solve this problem, solutions should be developed based on solar energy projects. Moreover, by selling after the self-consumption to the grid can be obtained more profit. This study includes the investigation of the rooftop of broiler plant with solar energy system. As a result, the total energy consumption of the plant was calculated as 46782 kWhyear-1 . To cover the consumption, 508 pieces (250 Watt) polycrystalline solar panels were used. The panels can be generate a total energy of 161536 kWhyear-1 . It is foreseen that a total energy of 114754 kWhyear-1 can be supply to the grid and 15264 $year-1 income can be obtain. The payback period of the system was found 5.9 years.
Side effects of azadirachtin on some important beneficial insects in laboratory
(Bursa Uludağ Üniversitesi, 2019-04-03) Cura, Mehmet Sadık; Gençer, Nimet Sema; Ziraat Fakültesi; Bitki Koruma Bölümü
The toxic effect of azadirachtin (0.3 g/L) in recommended dose, its half and twice doses were tested on Encarsia formosa, Aphidius colemani, Orius laevigatus and Nesidiocoris tenuis under laboratory conditions. The mortalities of nymphs and adults were evaluated by the IOBC toxicity rating scale for pesticides. As a result of the study, the product was harmful to O. laevigatus and N. tenuis adults and E. formosa pupa. Slightly and moderately harmful on N. tenuis nymph and A. colemani at recommended and twice doses. In recommended dose it was harmless only on N.tenuis male and E. formosa pupa at 24 h. Twice dose of the product was very toxic to all of the beneficial insects. The adulticide effects on males and females of O. laevigatus and N. tenuis in half dose at 48 h were found to be 83.33% and 75.00% and 78.26% and 76.20%, respectively. Additionally, little toxic effect (28%) was detected for A. colemani at half dose after 48 h. Similarly, at this dose, the mortality rates indicated less toxic effects on N. tenuis nymphs. In conclusion, it was understood that the recommended and twice doses of azadirachtin had negative effects on natural enemies. It was suggested that azadirachtin should be used carefully in pest control programs.

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