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RISS 인기검색어
- 검색키워드
- 저자 : Senanayake, Sanjaya D. (검색결과 17 건)
- 무료
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Fast-Response Load Regulation of DC-DC Converter By High-Current Clamp
Senanayake, Thilak Ananda,Ninomiya, Tamotsu The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.2
A new fast-response high-current clamp DC-DC converter circuit design is presented that will meet the requirements and features of the new generation of microprocessors and digital systems. The clamp in the proposed converter amplifies the current in case of severe load changes and is able to produce high slew rate of output current and capability to keep constant the output voltage. This proposed high-current clamp technique is theoretically loss less, low cost and easy to implement with simple control scheme. This is modified from a basic buck topology by replacing the output inductor with two magnetically coupled inductors. Inductors are difference in inductance, one has large inductance and other has small inductance. The inductor with small inductance will take over the output inductor during fast load transient. It speedup the output current slew rate and reduce the output voltage drop in the case of heavy burden load changes.
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Fast-Response Load Regulation of DC-DC Converter By high- Current Clamp
Thilak Ananda Senanayake,Tamotsu Ninomiya 전력전자학회 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.2
A new fast-response high-current clamp DC-DC converter circuit design is presented that will meet the requirements and features of the new generation of microprocessors and digital systems The clamp in the proposed converter amplifies the current in case of severe load changes and is able to produce high slew rate of output current and capability to keep constant the output voltage This proposed high-current clamp technique is theoretically loss less, low cost and easy to implement with simple control scheme. This is modified from a basic buck topology by replacing the output inductor with two magnetically coupled inductors. Inductors are difference in inductance, one has large inductance and other has small inductance The inductor with small inductance will take over the output inductor during fast load transient It speedup the output current slew rate and reduce the output voltage drop in the case of heavy burden load changes.
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Liu, Yang,Lee, Manseung,Senanayake, Gamini Elsevier 2018 Journal of molecular liquids Vol.268 No.-
<P><B>Abstract</B></P> <P>Application of mixed extractant systems containing different kinds of extractants have been widely investigated for the extraction and separation of metal ions. It has been found that synergistic and antagonistic effects occur during the extraction of metal ions even with similar systems the mechanism of which is not fully understood. This review attempts to summarize the reported explanations on the interaction mechanisms to explore the relationships between interaction and synergism or antagonism of mixed extractant systems. Two kinds of interactions, namely mixed complex formation and reverse micelle aggregation are mainly discussed in the present work. The nature and strength of interactions are qualitatively or quantitatively analyzed on the basis of property and amount of the extractant molecules by using several methods covering both molecular and supramolecular scales. The results suggest that though the apparent extractant effect of these systems can be proposed to some extent by analyzing interactions in the mixed extractant systems, it is incredibly difficult to predict definitive mechanisms from the initial nature of these systems.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Extracting properties of mixed extractants are reviewed based on their interactions </LI> <LI> Complex formation between extractants and reverse micelle aggregation are discussed </LI> <LI> Interactions depends on the nature and proportion of the involved components. </LI> <LI> Separation technologies utilizing mixed extractant systems are summarized. </LI> </UL> </P>
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Hu, Enyuan,Bak, Seong Min,Senanayake, Sanjaya D.,Yang, Xiao-Qing,Nam, Kyung-Wan,Zhang, Lulu,Shao, Minhua Elsevier 2015 Journal of Power Sources Vol.277 No.-
<P><B>Abstract</B></P> <P>Thermal stabilities of a series of blended LiMn<SUB>2</SUB>O<SUB>4</SUB> (LMO)–LiNi<SUB>1/3</SUB>Co<SUB>1/3</SUB>Mn<SUB>1/3</SUB>O<SUB>2</SUB> (NCM) cathode materials with different weight ratios were studied by <I>in situ</I> time-resolved X-ray diffraction (XRD) combined with mass spectroscopy in the temperature range of 25 °C–580 °C under helium atmosphere. Upon heating, the electrochemically delithiated LMO changed into Mn<SUB>3</SUB>O<SUB>4</SUB> phase at around 250 °C. Formation of MnO with rock-salt structure started at 520 °C. This observation is in contrast to the previous report for chemically delithiated LMO in air, in which a process of λ-MnO<SUB>2</SUB> transforming to β-MnO<SUB>2</SUB> was observed. Oxygen peak was not observed in all cases, presumably as a result of either consumption by the carbon or detection limit. CO<SUB>2</SUB> profile correlates well with the phase transition and indirectly suggests the oxygen release of the cathode. Introducing NCM into LMO has two effects: first, it makes the high temperature rock-salt phase formation more complicated with more peaks in CO<SUB>2</SUB> profile due to different MO (M = Ni, Mn, Co) phases; secondly, the onset temperature of CO<SUB>2</SUB> release is lowered, implying lowered oxygen release temperature. Upon heating, XRD patterns indicate the NCM part reacts first, followed by the LMO part. This confirms the better thermal stability of LMO over NCM.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Thermal stability of blended LiMn<SUB>2</SUB>O<SUB>4</SUB>(LMO)–LiNi<SUB>1/3</SUB>Co<SUB>1/3</SUB>Mn<SUB>1/3</SUB>O<SUB>2</SUB>(NCM) is studied. </LI> <LI> Blending of LMO with NCM leads to lower gas releasing temperature of CO<SUB>2</SUB> and O<SUB>2</SUB>. </LI> <LI> During heating the NCM decomposes first followed by the LMO. </LI> <LI> MnO, NiO and possibly CoO were formed at temperatures higher than 500 °C. </LI> </UL> </P>
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A kinetic study on hydrochloric acid leaching of nickel from Ni–Al2O3 spent catalyst
P.K. Parhi,K.H. Park,G. Senanayake 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.2
Hydrochloric acid leaching of nickel from spent Ni–Al2O3 catalyst (12.7% Ni, 39.2% Al and 0.68% Fe) has been investigated at a range of conditions by varying particle size (50–180 mm), acid concentration (0.025–2 M), pulp density (0.2–0.4%, w/v) and temperature (293–353 K). Nickel was selectively leached from the catalyst, irrespective of the different conditions. Under the most suitable conditions (1 M HCl,323 K, stirring at 500 rpm, 50–71 mm particle size), the extent of leaching of Ni and Al after 2 h was 99.9%and 1%, respectively. The XRD pattern of the spent catalyst corresponded to crystalline a-Al2O3 along with elemental Ni. The peak due to elemental Ni was absent in the residue sample produced at the optimum leaching conditions, confirming the complete dissolution of Ni from the spent catalyst. The leaching results were well fitted with the shrinking core model with apparent activation energy of 17 kJ/mol in the temperature range of 293–353 K indicating a diffusion controlled reaction.
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Xing, Wei Dong,Lee, Man Seung,Senanayake, Gamini Elsevier 2018 Hydrometallurgy Vol.180 No.-
<P><B>Abstract</B></P> <P>A separation process was developed to recover Au(III) from the chloride leach solution of anode slime using selective extraction and stripping step. The anode slime contained Ag, Au, Cu, Ni, Sn and Zn. The extraction with Cyanex 272 in kerosene was conducted by varying the HCl concentration of the solution from 0.5 to 9 M. Most of Au(III) and Sn(II) were extracted into Cyanex 272/kerosene phase together with a small amount of Cu(II) and Zn(II). The Au(III) in the loaded Cyanex 272 was selectively stripped over Sn(II) by (NH<SUB>4</SUB>)<SUB>2</SUB>S<SUB>2</SUB>O<SUB>3</SUB>. The McCabe-Thiele diagrams for the extraction and stripping were constructed. Extra pure Au(III) solution was recovered from the leach liquor by batch simulation experiments of two stage countercurrent extraction with Cyanex 272 and by one stage stripping with (NH<SUB>4</SUB>)<SUB>2</SUB>S<SUB>2</SUB>O<SUB>3</SUB>. The developed process can be applied to recover gold from a hydrochloric acid solution containing Ag(I), Cu(II), Sn(II) and Zn(II).</P> <P><B>Highlights</B></P> <P> <UL> <LI> A process was developed to recover Au(III) from anode slime leaching solution. </LI> <LI> HCl concentration was varied from 0.5 to 9 M to investigate the separation behavior. </LI> <LI> Cyanex 272 selectively extracted Au(III) and Sn(II) over Cu(II), Zn(II), Ni(II) and Ag(I). </LI> <LI> Only Au(III) in the loaded Cyanex 272 was stripped by (NH<SUB>4</SUB>)<SUB>2</SUB>S<SUB>2</SUB>O<SUB>3</SUB>. </LI> <LI> The purity of Au(III) in stripping solution was higher than 99.9%. </LI> </UL> </P>
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Parhi, P.K.,Park, K.H.,Senanayake, G. Korean Society of Industrial and Engineering Chemi 2013 Journal of industrial and engineering chemistry Vol.19 No.2
Hydrochloric acid leaching of nickel from spent Ni-Al<SUB>2</SUB>O<SUB>3</SUB> catalyst (12.7% Ni, 39.2% Al and 0.68% Fe) has been investigated at a range of conditions by varying particle size (50-180μm), acid concentration (0.025-2M), pulp density (0.2-0.4%, w/v) and temperature (293-353K). Nickel was selectively leached from the catalyst, irrespective of the different conditions. Under the most suitable conditions (1M HCl, 323K, stirring at 500rpm, 50-71μm particle size), the extent of leaching of Ni and Al after 2h was 99.9% and 1%, respectively. The XRD pattern of the spent catalyst corresponded to crystalline α-Al<SUB>2</SUB>O<SUB>3</SUB> along with elemental Ni. The peak due to elemental Ni was absent in the residue sample produced at the optimum leaching conditions, confirming the complete dissolution of Ni from the spent catalyst. The leaching results were well fitted with the shrinking core model with apparent activation energy of 17kJ/mol in the temperature range of 293-353K indicating a diffusion controlled reaction.
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Xing, Wei Dong,Lee, Man Seung,Senanayake, Gamini Elsevier 2018 Hydrometallurgy Vol.180 No.-
<P><B>Abstract</B></P> <P>In Part 1 of this paper, gold(III) and Sn(II) were recovered from the chloride leach solution of anode slimes by extraction with Cyanex 272 and stripping with (NH<SUB>4</SUB>)<SUB>2</SUB>S<SUB>2</SUB>O<SUB>3</SUB> and NaOH solutions for gold(III) and Sn(II), sequentially. In this work, solvent extraction experiments were conducted to recover Ag(I) and Cu(II) from the Au(III) free raffinate containing Ni(II), Sn(II) and Zn(II) using two systems. In the first system, Cu(II) and Ag(I) were sequentially separated using LIX 63 and Alamine 336, respectively. Dilute HCl and NH<SUB>4</SUB>SCN were used as the stripping agents for Cu(II) and Ag(I), respectively. In the second system, Cyanex 301 co-extracted Ag(I), Cu(II) and Sn(II) from the Au(III) free raffinate. Aqua regia at different dilutions stripped these three metal ions from the loaded Cyanex 301. First, Cu(II) was selectively stripped from the loaded Cyanex 301 by employing ten times diluted aqua regia. Second, most of Ag(I) was selectively stripped over Sn(II) by five times diluted aqua regia. A process flowsheet for the separation and recovery of noble and base metals from the chloride leach solution of anode slime using extraction and stripping has been proposed.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Au(III), Ag(I) and Cu(II) were recovered from the leach liquor of anode slime. </LI> <LI> Gold(III) was first separated by selective extraction with Cyanex 272. </LI> <LI> Cu(II) was then recovered by extraction with by LIX 63 and stripping with HCl solution. </LI> <LI> Extraction with Alamine 336 followed by stripping with NH<SUB>4</SUB>SCN led to Ag(I) solution. </LI> <LI> Both Cu(II) and Ag(I) was simultaneously extracted by Cyanex 301. </LI> </UL> </P>
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