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| 1 | Hydrometallurgical recycling of NdF eB magnets: Complete leaching, iron removal and electrolysis显示文摘NdFeB magnets currently dominate the magnet market. Supply risks of certain rare earth metals(REM), e.g. Nd and Dy, impose efficient recycling schemes that are applicable to different types and compositions of these magnets with minimum use of chemicals and waste generation. In this study, a hydrometallurgical method was studied that could be adjusted to recover not only REM, but also other valuable metals(e.g.Co, Ni and Cu) that co-existed in the magnet. The magnet powders were completely dissolved in a dilute sulfuric acid solution giving more than 98% of dissolved iron in the ferrous state. Chemical oxidation of Fe^(2+) into Fe^(3+) by the addition of MnO 2 required only 1 h at ambient temperature. It was then possible to precipitate more than 99% of this ferric iron by adjusting the pH of the solution above 3 with either Ca(OH)_2 or MnO additions. However, the addition of Ca(OH)_2 resulted in the formation of gypsum and up to ca. 23% REM losses, possibly via co-precipitation into the gypsum. MnO elevated the Mn^(2+) concentration in the solution. However, it was found to be problematic that subsequent direct electrolysis removed Mn and Co. Low anodic current efficiencies(ACE) resulted in high energy consumption(EC), while incomplete Mn and Co removals and undesired REM losses were reported. Pre-electrolysis removals of REM and/or Co by oxalate and/or sulfide precipitation were proven to be successful and selective, but this enlarged the flowsheet considerably with only minor improvement of the Mn removal, ACE and EC. | Mehmet Ali Recai Onal Chenna Rao Borra Muxing Guo Bart Blanpain Tom Van Gerven | 2017 | Journal of Rare Earths2017，35，6： | 6 |
| 2 | Achieving higher strength in Cu–Ag–Zr alloy by warm/hot rolling显示文摘High-strength Cu–3Ag–0.5Zr alloy plates were produced by multi-pass rolling in the temperature range of500–800 °C. An increase in strength was observed by rolling in the aforementioned range without significant loss in ductility. All the rolled samples show higher strength than solution-treated and aged samples. The maximum strength was observed for plates rolled at 500 °C with a yield strength and ultimate tensile strength of 311 and385 MPa, respectively, and retaining a ductility of 23 %.Transmission electron microscopy(TEM) studies showed uniform distribution of fine silver precipitates and high dislocation density in the rolled samples. Nevertheless, the size of precipitates and dislocation density varied with the rolling temperature. The superior strength achieved in the rolled samples is attributed to grain refinement, dislocation strengthening, and precipitation hardening. This method can be employed to produce high-strength plates of precipitation hardenable copper alloys. | S. Chenna Krishna Abhay K. Jha Bhanu Pant Koshy M. George | 2017 | Rare Metals2017，36，4： | 4 |
| 3 | State Estimation and Tracking Problems:A Comparison Between Kalman Filter and Recurrent Neural Networks 显示文摘 | Kumar Chenna S Yogesh Kr Jain Himanshu Kapoor | 2004 | Springer-Verlag Berlin Heidelberg2004，，4： | 1 |
| 4 | Multiple sequence alignment with the clustal series of programs显示文摘 | Chenna R Sugawara H Koike T | | 0，，13： | 1 |
| 5 | Characterization of 2'-deoxycytidine and 2'-deoxyuridine adduets formed in reactions with acrolein and 2-bromoaerolein 显示文摘 | Chenna A and Iden C R | 1993 | Chem Res Toxieol1993，6，： | 1 |
| 6 | Multiple sequence alignment with the clustal series of programs显示文摘 | CHENNA R SUGAWARA H KOIKE T | | 0，，13： | 1 |
| 7 | Characterization of thymidine adducts formed by acrolein and 2-bromoacrolein 显示文摘 | Chenna A Rieger R A and Iden C R | 1992 | Carcinogenesis1992，13，： | 1 |
| 8 | 显示文摘 | BAOYi-dan CHENNa HEYong etal(鲍一丹 陈纳 何勇 等) | 2015 | 光学精密工程2015，23，2： | 1 |
| 9 | Multiple sequence alignment with the Culstal series of programs显示文摘 | Chenna R Sugawara H Koike T | 2003 | Nucleic Acids Research2003，31，13： | 1 |
| 10 | Multiple sequence alignment with the Clustal series of programs显示文摘 | Chenna R Sugawara H Koike T | 2003 | Nucleic Acids Research2003，31，13： | 1 |
| 11 | Preparation and cytotoxicity toward cancer cells of mono(arylimino)derivatives of β-lapachone显示文摘 | Chenna PHD Benedetti-doctorovich V Baggio RF | 2001 | J Med Chem2001，44，15： | 1 |
| 12 | Multiple sequence alignment with the Clustal series of programs 显示文摘 | CHENNA R SUGAWARA H KOIKE T | 2003 | Nucleic Acids Research2003，，31： | 1 |
| 13 | Differential cleavage of oligonu-cleotides containing the benzene-derived adduct, 1, N6-benzethenodA, by the major human AP endonuclease HAP1 and Escherichia eoli exonuclease Ⅲ and endonuelease Ⅳ 显示文摘 | Hang B Chenna A Sagi J | 1998 | Carcinogenesis1998，19，8： | 1 |
| 14 | Multiple sequence alignment with the Clustal series of programs 显示文摘 | CHENNA R SUGAWARA H KOIKE T et el | 2003 | Nucl Acids Res2003，31，： | 1 |
| 15 | Multiple sequence alignment with the Clustal series of programs显示文摘 | Chenna R Sugawara H Koike T | 2003 | Nucleic Acids Research2003，31，13： | 1 |
| 16 | Multiple sequence alignment with the Clustal se-ries of programs显示文摘 | Chenna R Sugawara H Koike T Lopez R Gibson TJ Higgins DG | | 0，，31： | 1 |
| 17 | Formal total synthesis of borrelidin:synthesis of C1-C11 fragment via desym-metrization strategy显示文摘 | Yadav JS Bezawada P Chenna V | | 0，，27： | 1 |
| 18 | Multiple sequence alignment with the clustal series of programs显示文摘 | Chenna R Sugawara H Koike T Lopez R Gibson T J Higgins D G Thompson J D | | 0，，： | 1 |
| 19 | Micro- structure and properties of a high-strength Cu-Ni-Si-Co-Zr alloy显示文摘 | Chenna Krishna S Srinath J Jha Abhay K | 2013 | J Mater Eng Perform2013，22，7： | 1 |
| 20 | Radial Probe Endobronchial Ultrasound for Peripheral Pulmonary Lesions: A 5- Year Institutional Experience显示文摘 | Chen A Chenna P Loiselle A | 2014 | Ann Am Thorac Soc2014，11，4： | 1 |
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