Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53768#.VNHXMCzQrzE Author(s)  Robenson Cherizol 1,2,3* , Mohini Sain 1,3 , Jimi Tjong 2   Affiliation(s) 1 Centre for Biocomposites and Biomaterials Processing, Faculty of Forestry, University of Toronto, Toronto, Canada . 2 Powertrain Engineering Research & Development Centre, Ford Motor Company, Windsor, Canada . 3 Department of Chemical Engineering & Applied Chemistry, University of Toronto, Toronto, Canada . ABSTRACT The aim of this work was to develop a mathematical model to investigate the rheological characteristics of viscoelastic pulp-fibre composite materials. The rheological properties of High-Yield Pulp (HYP) reinforced bio-based Nylon 11 (Polyamide 11) (PA11) composite (HYP/PA11) were investigated using a capillary rheometer. Novel predicted multiphase rheological-model-based polymer, fibre, and interphasial phases were developed. Rh...

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...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53226#.VLhyzcnQrzE Author(s)    Ali Ahmadi , Mohammad Raouf Hosseini Affiliation(s) Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran . ABSTRACT Multiplicity of the chemical, biological, electrochemical and operational variables and nonlinear behavior of metal extraction in bioleaching environments complicate the mathematical modeling of these systems. This research was done to predict copper and iron recovery from a copper flotation concentrate in a stirred tank bioreactor using a fuzzy logic model. Experiments were carried out in the presence of a mixed culture of mesophilic bacteria at 35°  C, and a mixed culture of moderately thermophilic bacteria at 50°  C. Input variables were method of operation (bioleaching or electrobioleaching), the type of bacteria and time (day), while the recoveries of copper and ...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53226#.VLcsacnQrzE Author(s)    Ali Ahmadi , Mohammad Raouf Hosseini Affiliation(s) Department of Mining Engineering, Isfahan University of Technology, Isfahan, Iran . ABSTRACT Multiplicity of the chemical, biological, electrochemical and operational variables and nonlinear behavior of metal extraction in bioleaching environments complicate the mathematical modeling of these systems. This research was done to predict copper and iron recovery from a copper flotation concentrate in a stirred tank bioreactor using a fuzzy logic model. Experiments were carried out in the presence of a mixed culture of mesophilic bacteria at 35°  C, and a mixed culture of moderately thermophilic bacteria at 50°  C. Input variables were method of operation (bioleaching or electrobioleaching), the type of bacteria and time (day), while the recoveries of copper and ...

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=53136#.VLXWacnQrzE Author(s)     S. M. Navid Khatami 1 , Olusegun J. Ilegbusi 1 , Leonid I. Trakhtenberg 2   Affiliation(s) 1 Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL, USA . 2 Semenov Institute of Chemical Physics, Russian Academia of Sciences, Moscow, Russia . ABSTRACT The deposition of metal oxide films using Spray Pyrolysis Technique (SPT) is investigated through mathematical and physical modeling. A comprehensive model is developed in the processes including atomization, spray, evaporation, chemical reaction and deposition. The predicted results including particle size and film thickness are compared with the experimental data obtained in a complementary study. The predicted film thickness is in a good agreement with the measurements when the temperature is high enough for the chemical ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=51367#.VGVcx2fHRK0 Author(s) Gerardo Cifuentes , José Hernández , Jorge Manríquez , Nicolas Guajardo Affiliation(s) Department of Metallurgical Engineering, Universidad de Santiago de Chile, Santiago, Chile . ABSTRACT This work will create an electro-dialysis cell model that has the purpose of refining anodic scrap copper—an element that currently must be returned to the copper conversion process. The cell modeling is based on Ohm’s Law, while the resulting copper deposit morphology is studied through the thickness of the layer deposited on the surface and the electric current lines traced from the anode to the cathode. The us...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50616#.VEcly1fHRK0 Author(s) Makiko Obana , Ho-Seong Jeon , Tetsuro Tsujimoto Affiliation(s) Department of Civil Engineering, Nagoya University, Nagoya, Japan . ABSTRACT The transport and deposition of particulate organic matter (POM) in river streams has recently received much attention as one of important ecological processes in rivers. We focused on interacted behaviors of sand particles in bed load and POM in vegetated area on sand bars. The purpose of this study is to clarify the characteristics of deposition of POM with bed load on sandbars with the riparian vegetation. A basic experiment on POM transport and deposition with ve...