Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=20240#.VNCDsyzQrzE Author(s)   J. Y. HWANG Affiliation(s) Michigan Technological University, Institute of Materials Processing 1400 Townsend Drive, Houghton, MI 49931 . ABSTRACT Processing of fine particles in a slurry is a difficult problem. Methods to make fine particles magnetic have been developed recently and may offer a solution to this problem. Particles of nonmagnetic materials can be selectively rendered magnetic through surface interactions with magnetic reagents, which are prepared by dispersing nanoscale magnetite (about 10 nm diameter) with surfactants. When adsorption occurs, the magnetic susceptibility of the material is increased. Magnetic enhancement at several orders of magnitude can be achieved. Selectivity of the adsorption can be controlled by the functional groups of magnetic reagents and various surface interaction mechanisms. T...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53726#.VNB3aCzQrzE Author(s)   Yu Zhang , Shen Wang , Songling Huang * , Wei Zhao Affiliation(s) State Key Lab of Power System, Department of Electrical Engineering, Tsinghua University, Beijing, China . ABSTRACT The dispersion and multiple modes characteristics which exist in the propagation of Lamb waves (LW) in metal plates make it extremely hard to analyze and recognize the detection echo signals of defects. As a newly developed time-frequency analysis method in recent years, Hilbert-Huang transform (HHT) is one of the powerful tools to analyze non-stationary signals. The experimental LW detecting system for single aluminum plate is setup in this work, and the LW detecting signals are analyzed by HHT. The overlapped LW detecting signals of different modes are recognized by the means of extracting flight time of intrinsic mode functions (IMFs) after Hil...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53598#.VMnoLCzQrzE Author(s)     Ning Ma , Xiaofei Lu Affiliation(s) College of Science, China University of Petroleum, Beijing, China . ABSTRACT The compressible miscible displacement in a porous media is considered in this paper. The problem is a nonlinear system with dispersion in non-periodic space. The concentration is treated by a characteristics collocation method, and the pressure is treated by an orthogonal collocation method. Optimal order estimates are derived. KEYWORDS Compressible , Dispersion , Characteristics Collocation , Non-Periodic Cite this paper Ma, N. and Lu, X. (2015) Characteristics Collocation Method of Compressible Miscible Displacement with Dispersion. Journal of Applied Mathematics and Physics , 3 , 86-91. doi: 10.4236/jamp.2015.31012 . References [ 1 ] Douglas Jr., J. and Roberts, J.E. (1983) Numerical Methods for a Mod...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=45304#.VL3_FizQrzE Author(s)    Valery Katz , Gedalya Mazor Affiliation(s) SCE—Sami Shamoon College of Engineering, Beer-Sheva, Israel . SCE—Sami Shamoon College of Engineering, Beer-Sheva, Israel . ABSTRACT This article is a continuation of the research, centering on a vacuum-filtration system, which is designed to reduce the concentration of calcium in water; a process is also known as—water softening. The problem of solving the concentration distribution of the initial (embryonic) particles of CaCO 3 -particles, which were introduced into the limited volume of the apparatus with a turbine agitator-pump, is addressed through the use of diffusion and deterministic-stochastic models of mass transfer. The solution of the extreme problem allows determining the most important process parameters, such as time of dispersions homogenization and the dispers...