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RISS 인기검색어
- 검색키워드
- 저자 : Vinay Ranjan (검색결과 3 건)
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A new species of genus Dendrophthoe Mart. (Lorantheae-Loranthaceae) from the Peninsular India
Lal Ji Singh,Vinay Ranjan,L. Rasingam,J. Swamy 국립중앙과학관 2020 Journal of Asia-Pacific Biodiversity Vol.13 No.3
Dendrophthoe gamblei (Loranthaceae) a new species from the Peninsular India is described and illustratedalong with conservation status. Apparently, new species is similar to Dendrophthoe memecylifolia(Wight and Arn.) Danser but strictly differs in respect to its morphology of vegetative and floral characters. A taxonomic key to the species of Dendrophthoe Mart. from India is also provided.
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Heating and phyiso-mechanical characteristics of porous spinel developed by Starch
Kumar Saurav,Manas Ranjan Majhi,Vinay Kumar Singh 한양대학교 세라믹연구소 2016 Journal of Ceramic Processing Research Vol.17 No.10
Among the techniques used to produce these materials (such as the addition of foaming agents and organic compounds), thepore generation via phase transformation presents key aspects, such as easy processing and the absence of toxic volatiles. Inthis study, this technique was applied to produce porous ceramics by decomposing an EX potato known as starch soluble(C6H10O5)n. Porous MgO ceramics prepared at different sintering temperatures is studied. Porous MgO was synthesis byheating pellets at 1100 oC for 1hr. The resultant porous MgO was then immersed in an 10 mol/L aluminium nitrate solution,dried, and reheated at 1300 oC for 2 hrs to convert it to spinel. The method results from generalized relations that weredesigned for study of physical properties of fractal structures. As it is shown these relations are in a good agreement with theequations used for the description of time responses of temperature for the pulse input of supplied heat. The volume fractionof porosity can be defined as the fraction of void space relative to the apparent total bulk volume of the sample. Porosity inmaterials originates from different processing and synthesis routes.
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Desai Yuti,Srivastava Rajiv Ranjan,Srivastava Vijay Kumar,Kaushik Geetanjali,Singh Vinay Kumar 한국자원공학회 2023 Geosystem engineering Vol.26 No.5
The global generation of 2.2 billion tons of municipal solid waste (MSW) as a result of population growth, rapid urbanization, and industrial development has highlighted an urgent need for MSW management. Incineration is widely accepted as one alternative to landfilling; however, the recovery of heavy metals from the incinerated fly ash (IFA) before its final disposal is highly desirable to make the process sustainable. In this study, we studied the recovery of zinc and lead from typical MSW-IFA employing hydrometallurgical techniques. Sulfuric acid leaching was performed to selectively leach out zinc over the lead at the optimal condition of H2SO4 concentration = 1.5 M, temperature = 30°C, S/L ratio = 150 g/L, time = 2 h, and stirring speed = 300 rpm. The sulfate leach liquor was treated with a 5% stoichiometric excess of oxalic acid to precipitate>99% of zinc to be recovered as ZnC2O4·2 H2O. Further, the remaining lead in leach residue was subsequently leached in 50 g/L NaCl solution for 2 h yielded>94% efficiency. The dissolved lead was crystallized to recover the crystals of PbCl2. The demonstrated process leads towards the recovery of critical metals from an alternative source of MSW-IFA.
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