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    Flower bud formation in the strawberry (Fragaria × ananassa) planting materials grown on different locations
    (International Society for Horticultural Science, 2019) Şahin, E.; Gündüz, K.; Serçe, S.
    In strawberry production, the sustainability of the increasing trend and fulfilling the complete potential, expanding the harvesting period of has great importance. For this purpose, the better understanding of the flower bud formation in the strawberry cultivars from different background and determination of plating material types and planting dates are required. We investigated meristems coming from different locations (Amasya = high elevation and Antakya = low elevation) and sampled in four different dates (1 September, 15 September, 1 October and 15 October) using ‘Cal Giant–3’, ‘Camarosa’, ‘Festival’, ‘Kabarla’ and ‘Sweet Charlie’ cultivars; 2). During the investigation of the meristems, five plants of each of the high and low land locations’ mother, and daughter plants and plug planting material was observed. The plug planting materials produced in the low and high land locations were planted on the planting dates of 1 September, 15 September, 1 October and 15 October and the fruits were subjected to the pomological analyses for ‘Camarosa’ and ‘Festival’. The planting dates had statistically significant differences for ‘Festival’. Although there were some statistically significant differences among the pomological traits tested, constant patterns for all periods and cultivars resulted from either planting material type or planting dates was not recovered. The results indicated that to increase the early yield in strawberry production, studies targeting to identify cultivars with low chilling requirement which could form flower buds under less favorable conditions may result in more advantageous results. © 2019 International Society for Horticultural Science. All rights reserved.
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    Vickers and Knoop indentation microhardness study of ?-SiAlON ceramic
    (Polish Academy of Sciences, 2011) Güder, H.S.; Şahin, E.; Şahin, O.; Göçmez, H.; Duran, C.; Ali Çetinkara, H.
    In this paper, analysis and interpretation of mechanical property measurements of ?-SiAlON ceramic were reported. Indentation microhardness of ?-SiAlON ceramic was measured using the Knoop and Vickers indenters. The analysis of the Vickers indentation microhardness data reveals the reverse indentation size effect that is the apparent microhardness increases with increasing applied indentation test load. However, the Knoop indentation microhardness data exhibit indentation size effect that is the apparent microhardness increases with decreasing applied test load. The experimental Knoop microhardness data was analyzed using Meyer's law, elastic-plastic deformation model, proportional specimen resistance model, and Hays-Kendall's model. As a result, modified proportional specimen resistance model is found to be the most effective one for the load-independent (HLI) microhardness determination of the SiAlON ceramic. It was seen that different models used to analyze the data obtained from the Vickers indentation do not give the same intrinsic hardness value. We also present the calculation of the Young modulus, E, of the ?-SiAlON ceramic.