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RISS 인기검색어
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- 저자 : Amirjani, Mohammad Reza (검색결과 3 건)
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N. Amirjani,M. Ketabchi,M. Eskandari,M. Hizombor 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.11
Four Nb–V–Ti steel plates of API 5LX70 linepipe were produced with changing accelerated cooling rate and finish rollingtemperature using thermomechanical controlled process. The changes in ductile fracture surface, brittle fracture surfaces,including initial cleavage fracture and inverse fracture, arrowhead marking surfaces, and delamination were investigatedusing drop-weight tear test at temperatures of 0 °C and − 10 °C. Based on the drop-weight tear test results, an increase in theaccelerated cooling rate, resulting in an increase in the volume fraction of quasi polygonal ferrite, fine polygonal ferrite, andgranular ferrite microstructures, increased the percentage of ductile fracture surface and decreased the percentage of brittlefracture surfaces. Moreover, a reduction in the finish rolling temperature led to similar changes in the ductile fracture surfaceand brittle fracture surfaces due to an increase in the volume fraction of aciculae ferrite. Arrowhead markings surfaces,caused by the presence of banded structures, their percentage was reduced by increasing the accelerated cooling rate anddecreasing the finish rolling temperature at the temperature of 0 °C. Furthermore, as the accelerated cooling rate increased,the number, length, thickness, and depth of delaminations were reduced at temperatures of 0 °C and − 10 °C.
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Mahdieh, Majid,Shabani, Salimeh,Amirjani, Mohammad Reza The Korean Society for Microbiology and Biotechnol 2019 한국미생물·생명공학회지 Vol.47 No.1
The properties of microalgae as bioresources for biodiesel production can be improved by adding nitrogen sources into the culture medium. Thus, Nannochloropsis oceanica CCAP 849/10 was cultured in f/2 media supplemented with five different forms of nitrogen at $0.88mmol-N\;l^{-1}$ each: ammonium bicarbonate ($NH_4HCO_3$), ammonium sulfate ($(NH_4)_2SO_4$), sodium nitrate ($NaNO_3$), ammonium nitrate ($NH_4NO_3$), and urea. The cell density, lipid content, and fatty acid profile of the microalga were determined after 15 days of cultivation. The growth of N. oceanica based on cell number was lowest in the medium with $NH_4NO_3$, and increased significantly in the medium with $NH_4HCO_3$. Cells treated with $(NH_4)_2SO_4$, and $NH_4NO_3$ produced the highest total lipid contents (i.e., 65% and 62% by dry weight, respectively). The fatty acid profiles of the microalga were significantly different in the various nitrogen sources. The major fatty acids detected in cultures supplemented with $NH_4HCO_3$, $(NH_4)_2SO_4$, $NH_4NO_3$, or urea were C14:0, C16:0, C16:1, C18:0, C18:1, C18:2, C20:5, and C22:6. However, the C16:1 content in the $NaNO_3$-supplemented culture was very low. This study highlights that the nitrogen source can strongly influence lipid production in N. oceanica and its fatty acid composition.
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Majid Mahdieh,Salimeh Shabani,Mohammad Reza Amirjani 한국미생물·생명공학회 2019 한국미생물·생명공학회지 Vol.47 No.1
The properties of microalgae as bioresources for biodiesel production can be improved by adding nitrogen sources into the culture medium. Thus, Nannochloropsis oceanica CCAP 849/10 was cultured in f/2 media supplemented with five different forms of nitrogen at 0.88 mmol-N l-1 each: ammonium bicarbonate (NH4HCO3), ammonium sulfate ((NH4)2SO4), sodium nitrate (NaNO3), ammonium nitrate (NH4NO3), and urea. The cell density, lipid content, and fatty acid profile of the microalga were determined after 15 days of cultivation. The growth of N. oceanica based on cell number was lowest in the medium with NH4NO3, and increased significantly in the medium with NH4HCO3. Cells treated with (NH4)2SO4, and NH4NO3 produced the highest total lipid contents (i.e., 65% and 62% by dry weight, respectively). The fatty acid profiles of the microalga were significantly different in the various nitrogen sources. The major fatty acids detected in cultures supplemented with NH4HCO3, (NH4)2SO4, NH4NO3, or urea were C14:0, C16:0, C16:1, C18:0, C18:1, C18:2, C20:5, and C22:6. However, the C16:1 content in the NaNO3-supplemented culture was very low. This study highlights that the nitrogen source can strongly influence lipid production in N. oceanica and its fatty acid composition.
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