2024 Cilt 29 Sayı 2

Permanent URI for this collectionhttps://hdl.handle.net/11452/48921

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Design and analysis of two stage boost converter with improved control
(Bursa Uludağ Üniversitesi, 2024-08-06) Şentürk, Mustafa; Yeşilyurt, Hüseyin; Yok
In this article, a high-gain two-stage boost converter with improved control is proposed. In order the increase the regulation quality and power density a common control strategy introduced. In the proposed control method, each boost stage is controlled by the same controller. This method provides easy control and low cost and allows the use of lower voltage capacitors at the output of first boost stage. The converter is designed in two stages to increase from 12 VDC input voltage to 42 VDC and 150 VDC. Detailed theoretical analysis of the proposed converter is carried out and validated with a prototype having 100 W output power. Using the results obtained from the application circuit, the proposed boost converter with improved control is compared with the conventional two-stage boost converter operated under the same conditions.
Irrigation scheduling and determination of irrigation water requirement of paddy rice with drip irrigation using TAGEM-SUET model
(Bursa Uludağ Üniversitesi, 2024-06-18) Altınbilek, Hakkı Fırat; Kızıl, Ünal; Yok
Nowadays, as the pressure of drought on water resources increases, new approaches regarding paddy rice irrigation, which has the highest water consumption rate, need to be taken into consideration.One of these approaches is the drip irrigation method, which saves significant amount of water in paddy rice irrigation. In this study, 4 different irrigation programs (25%, 50%, 75% and 100%) in drip irrigation method and ponding methodfor paddy rice in Edirne were examined in TAGEM-SUET. As a result of the study, the evapotranspiration of paddy rice during the production season was calculated as 692.83 mm, the amount of irrigation water was calculated as 162-648 mm in drip irrigation. In the model, it was measured that the optimum drip irrigation program would not cause a decrease in efficiency despite saving 38% of water compared to the ponding method. It is thought that TAGEM-Suet can be a good tool for irrigation planning and management of paddy rice, depending on climatic conditions.
The use of graphene in the modification of bitumen: A literature review
(Bursa Uludağ Üniversitesi, 2024-05-28) Şahan, Neslihan; Kumandaş, Aytuğ; Oruç, Şeref; Yok
In recent years, nanomaterials in bitumen modification have become widespread due to their superior properties. Graphene and its derivatives are prominent examples of this. Therefore, this review study was conducted to evaluate the effect of graphene on bitumen in detail. Accordingly, by examining the literature studies, general information about graphene and its derivatives was given, and the preparation conditions of graphene-modified bitumen were evaluated. Then, the effect of graphene on the physical and rheological properties of bitumen was investigated. In addition, the effect of graphene modification on the performance of asphalt mixtures and the use of graphene in composite modification was investigated. As a result, it was determined that graphene improves the high-temperature performance of bitumen, but its effect on the lowtemperature and fatigue performance of bitumen is mostly negligible. In addition, it has been determined that graphene increases the rutting resistance of bituminous mixtures and positively affects the cracking resistance of bituminous mixtures in general.

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