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Banda, Raju,Sohn, Seong Ho,Lee, Man Seung Elsevier 2012 Journal of hazardous materials Vol.213 No.-
<P><B>Highlights</B></P><P>► Separation of Mo and Co from HCl solution was investigated by solvent extraction. ► The solution was synthetic leaching solution of spent HDS catalysts. ► Extraction with TOPO led to complete separation of Mo. ► Alamine 308 can separate Co from the Mo free raffinate. ► Recovery percentage of both metals was higher than 99%.</P> <P><B>Abstract</B></P><P>The separation and recovery of Mo and Co from the synthetic chloride leach liquors of petroleum refining catalyst has been investigated by employing TOPO and Alamine 308 as extractants. The synthetic leach liquor contained Mo 394mg/L, Al 1782mg/L, Co 119mg/L in 3M HCl. The separation of Mo from Co and Al was achieved with 0.05M TOPO in Escaid 110 and complete stripping of Mo was attained with combination of 0.1M NH<SUB>4</SUB>OH and 0.05M (NH<SUB>4</SUB>)<SUB>2</SUB>CO<SUB>3</SUB>. After separation of molybdenum, cobalt can be selectively extracted by Alamine 308 from Mo free raffinate after adjusting the concentration of chloride ion to 5M by adding AlCl<SUB>3</SUB>. The back-extraction of cobalt was obtained easily from loaded Alamine 308 with acidified water (pH=1.0). McCabe–Thiele diagrams were constructed from the extraction and stripping experiments of each element (Mo and Co). From the batch simulation of the counter-current extraction and stripping experiments, it was confirmed that Mo and Co recovery of 99.4% and 99.1% respectively was obtained from the synthetic leach liquor of the chloride solutions. Finally a hydrometallurgical process flow sheet was developed.</P>
Comparison of ANN- and GA-based DTC eCAR
Banda, Gururaj,Kolli, Sri Gowri The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.9
In this paper, an artificial intelligence (AI)-integrated direct torque control (DTC) scheme is developed for an electric vehicle (EV or eCAR) propulsion motor drive. In addition, a comparison is made between adaptive neural network (ANN) and genetic algorithm (GA)-based torque controllers. The integration of AI into EVs has attracted the attention of many researchers in terns if drive control, dynamic stability, speed estimation, and energy management strategies. Amidst the various motor drive control strategies, DTC schemes with space vector pulse width modulation (SVPWM) have gained prominence due to its fast torque (speed) control capability. The smooth control of a DTC-eCAR propulsion motor is accomplished by the use of AI algorithms. The applications of ANN and GA algorithms for tuning the torque controller are tested and the behavior of an eCAR in terms of drive range, percentage of state of charge (SOC), and energy consumption for different driving conditions is observed using MATLAB simulations.
Separation of Zr from Hf in Hydrochloric Acid Solution Using Amine-Based Extractants
Banda, Raju,Lee, Hwa Young,Lee, Man Seung American Chemical Society 2012 INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH - Vol.51 No.28
<P>Liquid–liquid extraction studies have been performed to investigate the selective extraction of zirconium (Zr) and hafnium (Hf) in hydrochloric acid medium. For this purpose, several amine-based extractants were used at varying concentrations of extractants and HCl. Among the tested extractants, Alamine 336 showed good selectivity for Zr over Hf and led to the highest separation factor. A McCabe–Thiele diagram was constructed for the extraction of Zr with Alamine 336 in kerosene, and the tested batch simulation of counter-current extraction studies showed that the extractions of Zr and Hf impurities were 98.5% and 12.5%, respectively. The coextracted Hf was scrubbed with dilute H<SUB>2</SUB>SO<SUB>4</SUB> solution, and complete stripping of Zr was successfully achieved from the loaded organic phase by simple contact with 1 M HCl solution.</P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/ie3008264'>ACS Electronic Supporting Info</A></P>
Banda, Raju,Min, Soo Hwan,Lee, Man Seung John Wiley Sons, Ltd 2014 Journal of chemical technology and biotechnology Vol.89 No.11
<P><B>Abstract</B></P><P><B>BACKGROUND</B></P><P>The present paper describes the selective extraction of Hf(IV) over Zr(IV) using two acidic extractants (D2EHPA and Cyanex 272) and its mixture with LIX 63 from sulphate medium. To achieve this, extractant and H<SUB>2</SUB>SO<SUB>4</SUB> concentrations were varied and results obtained.</P><P><B>RESULTS</B></P><P>Selective extraction of Hf(IV) over Zr(IV) was possible using D2EHPA/or Cyanex 272 at 2 mol L<SUP>‐1</SUP> and higher H<SUB>2</SUB>SO<SUB>4</SUB> solutions. For all investigated experimental conditions, D2EHPA exhibited greater efficiency than Cyanex 272 for the extraction of Hf(IV). Compared with either D2EHPA or Cyanex 272 alone, binary extractant mixtures (D2EHPA+LIX 63, Cyanex 272+LIX 63) did not show much selectivity towards the extraction of Hf(IV) over Zr(IV). Extraction with D2EHPA at 4 mol L<SUP>‐1</SUP> H<SUB>2</SUB>SO<SUB>4</SUB> solution led to a separation factor around 30 between Hf(IV) and Zr(IV).</P><P><B>CONCLUSIONS</B></P><P>Hf(IV) was selectively extracted over Zr(IV) in the investigated systems, with a good separation factor. Results indicated the possibility of separating the metal ions by selective extraction of Hf(IV). The selective extraction of Hf(IV) is important and advantages in separation give the potential for application in nuclear science and technology. © 2013 Society of Chemical Industry</P>
Banda, Raju,Jeon, Ho Seok,Lee, Man Seung Elsevier 2015 Journal of industrial and engineering chemistry Vol.21 No.-
<P><B>Abstract</B></P> <P>Solvent extraction of Pr and Nd from chloride solution was carried out using PC 88A for the recovery of magnetic grade Nd. The presence of complexing reagents (H<SUB>2</SUB>O<SUB>2</SUB> and citric acid) affected little the selective extraction of Nd over Pr. The observed maximum separation factor between Pr and Nd was 1.5, indicating that the separation of Nd and Pr by selective extraction was difficult. Co-extraction of two metals with PC 88A followed by selective scrubbing was tried. Batch simulation of counter-current showed that the complete recovery of Nd was possible and a process flow sheet has been presented.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nd was recovered from the mixed solution with Pr by extraction and scrubbing. </LI> <LI> Both Nd and Pr were extracted from chloride solution by saponified PC 88A. </LI> <LI> Quantitate scrubbing of Pr was obtained with pure Nd scrub solution. </LI> <LI> The scrubbed solution was recycled to the upstream stage of the process. </LI> <LI> The Nd recovery was achieved above >99%. </LI> </UL> </P>
Banda, Juan M. Korea Genome Organization 2019 Genomics & informatics Vol.17 No.2
The usage of controlled biomedical vocabularies is the cornerstone that enables seamless interoperability when using a common data model across multiple data sites. The Observational Health Data Science and Informatics (OHDSI) initiative combines over 100 controlled vocabularies into its own. However, the OHDSI vocabulary is limited in the sense that it combines multiple terminologies and does not provide a direct way to link them outside of their own self-contained scope. This issue makes the tasks of enriching feature sets by using external resources extremely difficult. In order to address these shortcomings, we have created a linked data version of the OHDSI vocabulary, connecting it with already established linked resources like bioportal, bio2rdf, etc. with the ultimate purpose of enabling the interoperability of resources previously foreign to the OHDSI universe.
H-TREES, RESTRICTIONS OF DOWLING GROUP GEOMETRIES
Mphako-Banda, Eunice Korean Mathematical Society 2015 대한수학회보 Vol.52 No.3
It has been established that the role played by complete graphs in graph theory is similar to the role Dowling group geometries and Projective geometries play in matroid theory. In this paper, we introduce a notion of H-tree, a class of representable matroids which play a similar role to trees in graph theory. Then we give some properties of H-trees such that when q = 0, then the results reduce to the known properties of trees in graph theory. Finally we give explicit expressions of the characteristic polynomials of H-trees, H-cycles, H-fans and H-wheels.
H-TREES, RESTRICTIONS OF DOWLING GROUP GEOMETRIES
Eunice Mphako-Banda 대한수학회 2015 대한수학회보 Vol.52 No.3
It has been established that the role played by complete graphs in graph theory is similar to the role Dowling group geometries and Projective geometries play in matroid theory. In this paper, we introduce a notion of H-tree, a class of representable matroids which play a similar role to trees in graph theory. Then we give some properties of H-trees such that when q = 0, then the results reduce to the known properties of trees in graph theory. Finally we give explicit expressions of the characteristic polynomials of H-trees, H-cycles, H-fans and H-wheels.