Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53697#.VM85jyzQrzE Author(s)    I. Medvedeva 1,2* , Iu. Bakhteeva 1 , S. Zhakov 1 , A. Revvo 2 , M. Uimin 1 , A. Yermakov 1 , I. Byzov 1 , A. Mysik 1 , N. Shchegoleva 1   Affiliation(s) 1 Institute of Metal Physics, Ural Branch of the Russian Academy of Sciences, Ekaterinburg, Russia . 2 Ural State Mining University, Ekaterinburg, Russia . ABSTRACT Sedimentation dynamics of magnetite ( γ -Fe 3 O 4 ) nanopowders (10 - 20 nm) in water in the presence of a gradient magnetic field was studied by optical and Nuclear Magnetic Resonance (NMR) relaxometry methods. The magnetic field B ≤ 0.3 T, dB/dz ≤ 0.13 T/cm was produced by the system of permanent strip magnets. The initial sedimentation rate of the nanoparticles in water and under magnetic fields is higher for less concentrated suspensions (c 0 = 0.1 g/l) than for more concentrated ones (c 0 = 1 g/l)....

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51707#.VHVl2mfHRK0 Author(s) Minyoung Kim * , Seounghee Kim , Sangbong Lee , Yongho Cho Affiliation(s) National Academy of Agricultural Science, Rural Development Administration, Jeonju City, Republic of Korea . ABSTRACT Agricultural drainage ditches play an important role in removing surplus water; however, these can also potentially act as major conduits of agricultural nonpoint source pollutants, including sediment, nitrogen, and phosphorus. A supplementary hybrid system to limit such pollution was developed in this study; this consists of biodegradable fiber check dams, used in combination with a synthetic polymer (Polyacr...