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Homam Naffakh Moosavy Mohammad-Reza Aboutalebi Seyed Hossein Seyedein Carlo Mapelli 《Journal of Materials Processing Technology》2013,213(11):1875-1884
The Scheil equation was used to model the solidification path, microsegregation of alloying elements in the interdendritic regions, solidification temperature ranges, and to predict the formation of secondary structures and the castability behavior of as-cast superalloys. 4 experimental alloys with pre-specified γ-Ti,Nb,Al,Mo composition containing different Nb, Ti and Al contents were designed using vacuum induction melting furnace. The produced as-cast superalloys were characterized using optical and scanning electron microscopy equipped with energy dispersive X-ray spectrometer and TG–DSC analysis. The experiments showed logic conformity to the modeling results. The model and experiment confirmed the highest segregation behavior for Ti and Nb. All the experimental superalloys indicated the remarkable tendency to form secondary eutectic structures at the last stages of solidification. Superalloy with chemical composition of γ-3.5%Mo,1.8%Al,4%Ti,2.9%Nb showed the shorter solidification temperature range and the best castability. 相似文献
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Encapsulation of Zataria multiflora Bioss. Essential Oil into Nanoliposomes and in Vitro Antibacterial Activity Against Escherichia coli O157:H7 下载免费PDF全文
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Mir-Hassan Moosavy Afshin Akhondzadeh Basti Ali Misaghi Taghi Zahraei Salehi Reza Abbasifar Hossein Ali Ebrahimzadeh Mousavi Majid Alipour Nader Emami Razavi Hassan Gandomi Negin Noori 《Food research international (Ottawa, Ont.)》2008,41(10):1050-1057
The effects of different concentrations of Zataria multiflora Boiss. essential oil (EO: 0, 5, 15 and 30 μl 100 ml−1) and nisin (N: 0, 0.25 and 0.5 μg ml−1), temperatures (T: 25 and 8 °C), and storage times (up to 21 days) on growth of Salmonella typhimurium and Staphylococcus aureus in a commercial barley soup were evaluated in a factorial design study. The growth of S. typhimurium was significantly (P < 0.05) decreased by EO concentrations and their combinations with N concentrations at 8 °C. For S. aureus, the viable count was significantly (P < 0.05) inhibited by EO and N concentrations and their combinations, incubated at both storage temperatures. The mechanism of the antimicrobial action of EO, N, and their combinations against cell membranes of the tested organisms were also studied by measurement of the release of cell constituents and by the electronic microscopy observations of the cells. The significant increase of the cell constituents’ release of both organisms was observed as a result of treatments with EO and EO in combination with N. Electronic microscopy observations revealed that the cell membranes of S. typhimurium treated by EO and EO in combination with N were significantly damaged, while cells treated with only N looked similar to untreated cells. The electron micrographs of treated cells of S. aureus with EO, N, and their combination also showed important morphological damages and disrupted membranes. 相似文献
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An analytical algorithm to predict weldability of precipitation-strengthened nickel-base superalloys
Homam Naffakh Moosavy Mohammad-Reza AboutalebiSeyed Hossein Seyedein 《Journal of Materials Processing Technology》2012,212(11):2210-2218
A new mathematical-solidification-weldability model has been developed to obtain the optimum chemical composition in the γ-Ti–Al–Nb precipitation-strengthened nickel-base superalloys, in which, the best resistance to hot cracking be achieved. To solve the weldability model, SEM microphotographs and EDAX analysis extracted from microstructure of the welds and phase diagrams were used as model data inputs. The relation between the segregating elements versus the retained weld liquid, and as well as, solidification path of welds (L → γ) were attained. The model is able to predict the brittleness temperature range (BTR) and the extent of weld mushy zone as a direct criterion of weldability determination. For the weld type A (alloy Inconel 718), formation of secondary phases or eutectics is too probable. In case of weld type B (alloy Udimet 500), formation of secondary phases enriched in Ti in the interdendritic locations can be anticipated. The BTRs and the size of mushy zones for welds type A, B and C (65 wt% alloy 500 + 35 wt% alloy 718) have been calculated. The solidification-weldability model showed that weld type C with dilution level of 65% and the ratio Nb/(Ti + Al) = 0.53 has the best weldability among the dilutions studied and can be offered as a new-weldable nickel-base superalloy. 相似文献
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Behaviour of Listeria monocytogenes in Lighvan cheese following artificial contamination during making,ripening and storage in different conditions 下载免费PDF全文
Mir‐Hassan Moosavy Saber Esmaeili Amir Mohammad Mortazavian Ehsan Mostafavi Bohlol Habibi‐Asl Hedayat Hosseini Seyed Amin Khatibi 《International Journal of Dairy Technology》2017,70(3):365-371
This study investigated the behaviour and fate of Listeria monocytogenes at different ripening temperatures and NaCl concentrations in traditional Lighvan cheese. L. monocytogenes was added to raw sheep's milk. After producing the cheese, they were stored in 8%, 12% and 15% NaCl at 4, 9 and 14 °C. Sampling was performed for 150 days. Different temperature and NaCl concentrations had a significant effect on the survival of L. monocytogenes (P < 0.001). The lowest growth and survival rates of L. monocytogenes were in 15% NaCl at 14 °C and 12% NaCl at 14 °C, respectively. Also, the highest growth and survival rates of the bacterium were in 8% NaCl at 4 °C. 相似文献
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