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RISS 인기검색어
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- 저자 : Oyunchuluun, Undram (검색결과 2 건)
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Plant species composition and vegetation cover of Kherlen Toono Mountain, Mongolia
Dariimaa Shagdar,Oyunchuluun Yadamsuren 국립중앙과학관 2017 Journal of Asia-Pacific Biodiversity Vol.10 No.1
The Kherlen Toono Mountain Natural Reserve has a unique natural formation that makes its flora and vegetation cover unique. This study aimed to prepare a species inventory of flora and conduct make visual assessments of the vegetation cover of Kherlen Toono Mountain. A total of 202 species belonging to 115 genera, 46 families, and 4 phyla (Equisetophyta, Polypodiophyta, Pinophyta, and Magnoliophyta) were recorded. During this study, a species [Vincetoxicum lanceolatum (Grubov) Grubov] was newly recorded in the vegetation of the Dundad Khalkh district. An endemic species, 7 subendemic species (4.9%), and 10 rare species (3.9%) were recorded in the study area, which comprised 8.9% of the total species. These species recordings indicated the unique flora of the Kherlen Toono Mountain region. Forb–khargana and needle grass–forb communities of 10 different communities were commonly recorded in the study area.
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Valuable rubidium extraction from potassium reduced seawater brine
Naidu, Gayathri,Jeong, Sanghyun,Choi, Youngkwon,Song, Min Hyung,Oyunchuluun, Undram,Vigneswaran, Saravanamuthu Elsevier 2018 Journal of cleaner production Vol.174 No.-
<P><B>Abstract</B></P> <P>Extraction of rubidium (Rb) which is an economically valuable metal from seawater reverse osmosis (SWRO) brine is beneficial. However, potassium (K) in SWRO brine hinders Rb extraction. Natural clinoptilolite zeolite in powder form was able to selectively remove K from SWRO brine (Langmuir maximum sorption, Qmax (cal.) = 57.47 ± 0.09 mg/g). An integrated submerged membrane sorption reactor (SMSR) containing zeolite powder achieved 65% K removal from SWRO brine. Periodic replacement of zeolite in SMSR, coupled with membrane backwashing was effective in maintaining a high K removal efficiency and a stable transmembrane pressure. Less than 5% Rb losses occurred along with K sorption, establishing the high K selectivity by zeolite in SWRO brine. Utilization of K loaded zeolite as a slow release fertilizer would be beneficial for agriculture. In SWRO brine with reduced K contents, the Rb sorption efficiency of polymer encapsulated potassium copper hexacyanoferrate (KCuFC(PAN)) sorbent, increased significantly from 18% to 83%.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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