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    EFFECT OF PHYSICAL AND MECHANICAL PROPERTIES OF ROCKS ON THE IMPACT HAMMER PERFORMANCE IN Nİ?DE PROVINCE QUARIES
    (Chamber of Mining Engineers of Turkey, 2020) Sari, Mehmet; Yilmaz, Tevhit; Çomakli, Ramazan
    In this study, the effects of physical and mechanical properties of the rocks on the performance of impact hammers used to crush boulders in muck piles produced after drilling and blasting were investigated for seven different quarries operating in Ni?de province. For this purpose, the muck piles were analysed using image processing method to determine the amount of the boulders. Total operating time and breaking rate of the hydraulic impact hammers were measured during a secondary breaking task for oversized boulders. Hydraulic hammers with the similar specifications were employed in all quarries visited in this study. In this regard, it was possible to investigate the relationships between hydraulic hammers' instantaneous production rate with the physical and mechanical properties of the rocks by simple regression method. Accordingly, significant linear relationships in various levels were found between the physical-mechanical properties of the rocks and hydraulic hammer performance. At the end of the study, a multiple linear regression equation was proposed to estimate instantaneous production rate of the impact hammers based on the independent parameters. © 2020 Union of Chambers of Engineers and Architects of Turkey. All rights reserved.
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    Effects of genotype and fattening system on the quality of male lamb meat - Part 1: Technological properties and carcass measurements
    (Copernicus Gesellschaft Mbh, 2019) Sari, Mehmet; Aksoy, Yuksel; Onk, Kadir; Erinc, Hakan; Isik, Serpil A.; Tilki, Muammer
    This study was conducted to determine the effect of genotype and fattening system on carcass measurements of lambs and technological properties of the male lamb meat (Musculus longissimus dorsi, MLD). The animal material in the study included 39 Hemsin (H) and 39 Tuj (T) male lambs. Extensive (E), semi-intensive (SI) and intensive (I) fattening systems were applied in the study, which was completed within 90 d. In the E, SI and I fattening groups, a total of 48 lambs, including 16 lambs in each group, were slaughtered. The results of the study indicated that the effect of genotype on the first-hour yellowness (b*), being one of the colour parameters of the MLD, and the effect of the fattening system on 1 h hour redness (a*) and chroma (C*), being among the colour parameters, were statistically significant (P < 0.05). The effect of genotype and fattening system on MLD pH at 45 min (pH(45 )(min)) and 24 h (pH(24h)) after the slaughtering and on the third and seventh hour drip loss (DL %) was statistically nonsignificant (P > 0.05). The effect of genotype and fattening system on DL, cooking loss (CL %) and texture (TT) was nonsignificant (P > 0.05), whereas the effect of these factors on water-holding capacity (WHC %) was significant (P < 0.05). The effect of genotype on external carcass length (ECL), internal carcass length (ICL), internal hindquarter length (IHL), and carcass and leg conformation was statistically significant (P < 0.05). The effect of the fattening system on all the carcass measurements except for carcass conformation, carcass depth (CD) and external chest width (ECW) was statistically significant (P < 0.05). Genotype and fattening system affected the colour and some quality traits of meat and carcass measurements of lambs.