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Synthesis and Evaluation of Stearic Acid Derivatives as Cetane Number Improvers
Rode, Ambadas B.,Thajudeen, H.,Chung, Keun-Woo,Kim, Young-Wun,Hong, In-Seok Korean Chemical Society 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
1,2,4,5-tetraoxane, mono and dinitrate glycerol carbonate ester derivatives of stearic acid were synthesized along with the known 9(10)-keto methyl sterate, methoxy mono-nitrate and dinitrate of methyl stearate. Their cetane numbers (CNs) were investigated to evaluate their viability for use as CN improvers. The CN performances of tetraoxane and all of the nitrate derivatives were investigated at 500 and 1000 ppm concentrations and compared to that of a traditional CN improver 2-ethylhexyl nitrate (2-EHN). The experimental results suggest that all derivatives evaluated in this study showed better CN improvement than base diesel fuel. Specifically, the 1,2,4,5-tetraoxane derivative of stearic methyl ester was superior to all derivatives studied, also being superior to 2-EHN. We also discussed the correlations between the observed CN trends and thermo-analytical data resulted from thermo gravimetric analysis curves (TGA) and differential scanning calorimetry (DSC).
A review on development in design of multistage centrifugal pump
Rode, Bhushan R.,Khare, Ruchi Techno-Press 2021 Advances in computational design Vol.6 No.1
Multi-stage pumps are the most popular pumps among various kinds of centrifugal pumps. Athorough review of different kinds of literature has led to the conclusion that there is a desperate need to increase the performance of the multi-stage centrifugal pump. Many investigators have put their efforts to increase the pump performance and also the work is being projected on various aspects of pump performance variables. To improve the multistage centrifugal pump performance by investigation, modification, and analysis many works of literature are available. For analysis, many researchers used the Navier-Stokes solver to create the three-dimensional unsteady turbulent flow numerical model with the standard k-ε turbulent equation. This paper mainly focuses on research related to the multi-stage centrifugal pump.
Synthesis and Evaluation of Stearic Acid Derivatives as Cetane Number Improvers
Ambadas B. Rode,Young-Wun Kim,Keunwoo Chung,H. Thajudeen,In Seok Hong 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.6
1,2,4,5-tetraoxane, mono and dinitrate glycerol carbonate ester derivatives of stearic acid were synthesized along with the known 9(10)-keto methyl sterate, methoxy mono-nitrate and dinitrate of methyl stearate. Their cetane numbers (CNs) were investigated to evaluate their viability for use as CN improvers. The CN performances of tetraoxane and all of the nitrate derivatives were investigated at 500 and 1000 ppm concentrations and compared to that of a traditional CN improver 2-ethylhexyl nitrate (2-EHN). The experimental results suggest that all derivatives evaluated in this study showed better CN improvement than base diesel fuel. Specifically, the 1,2,4,5-tetraoxane derivative of stearic methyl ester was superior to all derivatives studied, also being superior to 2-EHN. We also discussed the correlations between the observed CN trends and thermo-analytical data resulted from thermo gravimetric analysis curves (TGA) and differential scanning calorimetry (DSC).
Positive magnetisation in carbon nanostructures
A.V. Rode,A.G. Christy,N.R. Madsen,E.G. Gamaly,S.T. Hyde,B. Luther-Davies 한국물리학회 2006 Current Applied Physics Vol.6 No.3
Carbon nanoclusters produced by high-repetition-rate laser ablation of glassy carbon in Ar exhibits para- and ferromagnetic behav-iour up to 90 K, showing a narrow hysteresis curve with a coercive forceHc = 420 Oe, remnant magnetisation of 5· 10. 3 emu/g, sus-ceptibility of the order of 10. 5 emu/g Oe and saturation magnetization 0.30.8 emu/g at 1.8 K. We consider briey the mechanism offormation of clusters in the laser-ablated vapour and structural characteristics of the nanoclusters, which show the presence of graph-ite-like sheets with hyperbolic curvature, as proposed for ‘‘schwarzite’’. We postulate that localized unpaired spins occur because of topo-oered by the convoluted sheets.
Helical-edge transport near ν = 0 of monolayer graphene
홍성주,Belke Christopher,Rode Johannes C.,Brechtken Benedikt,Haug Rolf J. 한국물리학회 2021 Current Applied Physics Vol.27 No.-
The complex nature of filling factor ν = 0 of monolayer graphene is studied in magnetotransport experiments. As a function of perpendicular magnetic field a metal-insulator transition is observed, which is attributed to disorder-induced Landau level broadening in the canted antiferromagnetic phase. In the metallic regime a separation of the zeroth Landau level appears and signs of the quantum spin Hall effect are seen near ν = 0. In addition to local transport, nonlocal transport experiments show results being consistent with helical edge transport.
Kim, Byeong Mo,Rode, Ambadas B,Han, Eun Jong,Hong, In Seok,Hong, Sung Hee Rapid Science Publishers ; Kluwer Academic Publish 2012 Apoptosis Vol.17 No.2
<P>In the present study, we investigated the signaling pathways implicated in the induction of apoptosis by two modified nucleosides, 5-phenylselenyl-methyl-2'-deoxyuridine (PhSe-T) and 5-methylselenyl-methyl-2'-deoxyuridine (MeSe-T), using human cancer cell lines. The induction of apoptosis was associated with proteolytic activation of caspase-3 and -9, PARP cleavage, and decreased levels of IAP family members, including c-IAP-1 and c-IAP-2, but had no effect on XIAP and survivin. PhSe-T and MeSe-T also enhanced the activities of caspase-2 and -8, Bid cleavage, and the conformational activation of Bax. Additionally, nucleoside derivative-induced apoptosis was inhibited by the selective inhibitors of caspase-2, -3, -8, and -9 and also by si-RNAs against caspase-2, -3, -8, and -9; however, inhibition of caspase-2 and -3 was more effective at preventing apoptosis than inhibition of caspase-8 and -9. Moreover, the inhibition of caspase-2 activation by the pharmacological inhibitor z-VDVAD-fmk or by the knockdown of protein expression using siRNA suppressed nucleoside derivative-induced caspase-3 activation, but not vice versa. PhSe-T and MeSe-T also induced a δψ(m) loss via a CsA-insensitive mechanism, ROS production, and DNA damage, including strand breaks. Moreover, ROS scavengers such as NAC, tiron, and quercetin inhibited nucleoside derivative-induced ROS generation and apoptosis by blocking the sequential activation of caspase-2 and -3, indicating the role of ROS in caspase-2-mediated apoptosis. Taken together, these results indicate that caspase-2 acts upstream of caspase-3 and that caspase-2 functions in response to DNA damage in both PhSe-T- and MeSe-T-induced apoptosis. Our results also suggest that ROS are critical regulators of the sequential activation of caspase-2 and -3 in nucleoside derivative-treated cancer cells.</P>