Yazar "Eremkere, M." seçeneğine göre listele

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    Kivi Meyvesinin İnce Tabaka Kurutma Karakteristiklerinin ve Sorpsiyon Özelliklerinin Saptanması
    (TUBITAK, 2020) Diken, B.; Eremkere, M.; Demirtaş, Gülizar; Kayişoğlu, B.; Aktaş, Türkan
    Drying process is one of the methods used to supply consuming of fruits and vegetables out of the harvesting period and to preserve the market value. In this research, kiwi fruit, which is rapidly growing of its production in our country in recent years, was sliced in 3 mm thickness and dried at different temperatures (50-60-70 °C) and constant airspeed (2.2 m s-1) in a hot air dryer as thin layer. The sorption isotherms, which are very important in terms of continuity of product quality stability and which are used to understand the physicochemical relationship between water and product, were determined at 3 different temperatures (30, 40 and 50 °C) and 5 different ambient relative humidity conditions for fresh and dried kiwi samples. The obtained experimental sorption data were adapted to 4 different models, namely BET, GAB, Oswin and Smith models. Four mathematical drying models namely Henderson and Pabis, Page, Logarithmic, Wangh and Singh were applied to the experimental results of drying processes. It was determined that the most suitable mathematical model is Page model in hot air drying of kiwi according to the comparison of root mean square error (RMSE), chi-square (?2) and model efficiency (EF) values obtained by modeling of drying data. It was determined that the most suitable mathematical model is GAB model for the sorption behavior of kiwi fruit. The effective diffusion coefficient values ranged from 2.73936 x 10-10 (50 ?C) to 3.89772 x 10-10 m2 s-1 (70 ?C) depending on the temperature. © 2020, TUBITAK. All rights reserved.
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    Physical and mechanical properties and influence of drying techniques on drying characteristics and some quality parameters of malabar spinach (Basella alba L.)
    (Parlar Scientific Publications, 2019) Hastürk Şahin, F.; Açıkgöz, Funda Eryılmaz; Eremkere, M.; Aktaş, Türkan
    The aims of this research were to measure of some physical and mechanical properties and investigate the influence of drying methods on changing of drying kinetics as well some quality properties of Malabar spinach (Basella alba L.). For these purposes, Malabar spinach (Basella alba L.) was grown in climate-controlled laboratory conditions. Then, the leaves of plant were dried either microwave method or convective hot air drying method. For hot air drying process, three drying temperatures (40, 50 and 60°C) were applied. Three power levels (180, 360 and 600W) were applied for microwave drying process. Mechanical (laceration force, puncture force) and physical properties (leaf lenght, leaf area, stalk thickness, leaf thickness, and initial weight) of fresh Malabar spinach plant samples were measured. Some analyzes such as color (L*, a*, b*), water activity of fresh and dried plant were made to determine quality changes with drying processes. The mean leaf laceration force was determined as 0.0435 kgf while the puncture force value was determined as 0.0144 kgf for fresh leaf samples. Hot air drying process lasted 31, 17 and 6.5 hours for 40, 50 and 60°C drying temperatures, respectively. Microwave drying process took 7.5, 5.5 and 4 minutes for 180, 360 and 600W power levels, respectively. L* and a* values of the samples increased while b* values decreased after all drying applications. Final moisture content values of all dried products were determined between 10.9% and 16%. aw values of all dried samples were determined lower than the critic level that allows mold growth (aw <0.6). © by PSP
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    Tekirdağ Bağcılık Araştırma Enstitüsü Üzüm Suyu İşleme Tesis Çatısına Uygulanabilecek Fotovoltaik Tasarımların Teknik, Ekonomik ve Çevresel Açılardan Analizi
    (TUBITAK, 2020) Eremkere, M.; Aktaş, Türkan
    Renewable energy sources should be expanded instead of fossil energy sources due to their environmental damage and exhaustion property. Especially, unused roof areas in agricultural production plants are good options for electricity generation using PV panels. In this research; theoretical, practical and technical solar energy potentials were determined; the amount of electricity that can be produced and carbon emission amounts that can be reduced by PV panels were found using PVsyst and RETScreen software in 6 different designs for the roof area of Grape Products Processing Plant in Tekirdag Viticulture Research Institute. The average consumed energy during grape juice production period was determined as 4059,822 kWh. As a result of this research, the technical solar energy potential was found as 1543 kWh/m2 annually with acceptance of panel angle as 20? and the azimuth angle as 0?. Performance ratios for monocrystalline (mono-si), polycrystalline (poly-si) and amorfcrystalline (a-si) PV system designs were calculated as 85,15%-84,39%-80,40% while annual electricity generation values were calculated as 1219-1280-1291 kWh/kWp/year, respectively. It was seen that greenhouse gas reductions can be achieved as 10.9 tCO2/year in case of generation of 23.1 MWh electricity per year (mono-si); 10.5 tCO2 /year in case of 22.4 MWh electricity generation (poly-si) and 4.9 tCO2 /year in case of 10.3 MWh electricity generation (a-si). It was found that designs using a-si panel type are not suitable due to the limited roof area of the plant while designs using mono-si and poly-si panels provide approximate outputs in terms of cost and efficiency. © 2020, TUBITAK. All rights reserved.