3,509 research outputs found
Performance of Chinese Children in Taiwan on Beery’s Developmental Test of Visual-Motor Integration
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Analysis and comparison of the psychometric properties of three balance measures for stroke patients
No full textChromate and HF free pretreatment for MAO/electroless nickel plating on AZ31B magnesium alloy
Get PDF: Microarc oxidation (MAO) coating was developed as an interlayer for the electroless nickel (EN) top coat to improve the corrosion resistance of Mg alloy. Prior to the electroless nickel coating, oxide layer was activated by using NaBH4 solution as a replacement for traditional chromate and HF activation process. The EN coatings were prepared from the alkaline carbonate bath. The prepared coatings were characterized for the surface morphology and composition using Field emission scanning electron microscopy (FE-SEM) attached with Energy dispersive analysis of X-ray (EDX). Potentiodynamic polarization and electrochemical impedance spectroscopy (EIS) studies were carried out in non-deaerated 3.5% NaCl solution to find out the corrosion resistance of the coatings. The MAO coating showed porous morphology with micro cracks whereas, MAO/Ni-P coating exhibited dense nodular structure. The composition analysis on the surface of MAO/Ni-P showed 10 wt.% P indicated the high P coating. The cross- sectional images showed good adhesion between MAO and Ni-P layers. This clearly indicates that the present activation process results in dense with uniform pores of MAO coating which supply excellent bonding interface for Ni–P coat. The MAO/EN coating combination showed about 97 times improved corrosion resistance as compared with the substrate and similar behaviour was observed by EIS studies
Chromate and HF free pretreatment for MAO/electroless nickel coating on AZ31B magnesium alloy
No full textMicro arc oxidation (MAO) coating was developed as an interlayer for the electroless nickel (EN) top coat to improve the corrosion resistance of Mg alloy. Prior to the electroless nickel deposition, oxide layer was activated by using NaBH4 solution as a replacement for conventional chromate and HF activation processes. EN coatings were prepared using the alkaline carbonate bath. As-prepared coatings were characterized for the surface morphology and composition using Field Emission Scanning Electron Microscopy (FESEM) attached with energy dispersive analysis of X-ray (EDX). Potentiodynamic polarization studies were carried out in non-deaerated 3.5% NaCI solution to find out the corrosion resistance of the coatings. The MAO coating showed porous morphology with micro cracks whereas, MAO/Ni-P coating exhibited dense nodular structure. The cross-Ni-P and MAO/Ni-P/Ni-W-P duplex al images showed good adhesion between MAO and Ni-P layers. This clearly indicates that the present activation process results in dense with uniform pores of MAO coating along with excellent bonding at the interface for Ni-P coat. The MAO/EN coating combination showed two orders improvements in corrosion resistance as compared with the substrate. (C) 2017 Published by Elsevier B.V
Financial analysis, asset allocation, and portfolio construction: Theory & practice
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On financial statements modelling and fundamental analysis
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in a data base or retrieval system, without the prior written permission of HF Consulting. This material has been shared with permission from the author and HF Consulting
The mathematics of statistical modelling: Abstract to specific
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reproduced or transmitted in any forms or by any means now known or later devised, or sorted
in a data base or retrieval system, without the prior written permission of HF Consulting. This material has been shared with permission from the author and HF Consulting
Hafnocenes and MAO: Beware of Trimethylaluminum
No full textA study has focused on finding intrinsic properties of Hafnocenes and methylalumoxane (MAO) based catalysts. The researchers have evaluated more carefully the behavior of HF-based homologues 3 and 4 with yield polymers with much higher average molecular masses rate, in propene polymerization with different activators. Analysts have used MAO or [Ph3C] [B(C 6F5)4]/Al(iso-butyl)3 (TrB/TIBA). TIBA was considered for its role as a scavenger and also as a convenient alkylating agent of metallocene dichlorides. The observation presented in the study highlighted a hidden layer of complexity underneath the seemingly straightforward picture of propene polymerization mediated by group 4 metallocene catalysts. Proposed structure demonstrated that catalyst behavior is strongly idiosyntcratic and that changing the transition metal from Zr(IV) to Hf(IV) in an otherwise identical ligand framework can change dramatically
Terminal suturing of Gondwana along the southern margin of South China Craton : evidence from detrital zircon U-Pb ages and Hf isotopes in Cambrian and Ordovician strata, Hainan Island
No full textThis work was supported by the National Natural Science Foundation of China (grants 41472086 and 41272120), “111” Project (B08030), the fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) (CUG2012019240 and CUG2013019137). The first author also acknowledges China Scholarship Council (grant 201208420001) for supporting his research in the University of St. Andrews. Date of Acceptance: 20/11/2014Hainan Island, located near the southern end of mainland South China, consists of the Qiongzhong Block to the north and the Sanya Block to the south. In the Cambrian, these blocks were separated by an intervening ocean. U-Pb ages and Hf isotope compositions of detrital zircons from the Cambrian succession in the Sanya Block suggest that the unit contains detritus derived from late Paleoproterozoic and Mesoproterozoic units along the western margin of the West Australia Craton (e.g., Northampton Complex) or the Albany-Fraser-Wilkes orogen, which separates the West Australia and Mawson cratons. Thus, in the Cambrian the Sanya Block was not part of the South China Craton but rather part of the West Australian Craton and its environs. In contrast, overlying Late Ordovician strata display evidence for input of detritus from the Qiongzhong Block, which constituted part of the southeastern convergent plate margin of the South China Craton in the early Paleozoic. The evolving provenance record of the Cambrian and Ordovician strata suggests that the juxtaposition of South China and West Australian cratons occurred during the early to mid-Ordovician. The event was linked with the northern continuation of Kuungan Orogeny, with South China providing a record of final assembly of Gondwana.Peer reviewe
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