Operations Research
1. A Taghuchi based Multi Objective Time-Cost Constrained Scheduling for Resource Availability Cost Problem: A Case Study

M. Rabbani; S. Aghamohamadi; H. Farrokhi-Asl; M. Alavi mofrad

Volume 6, Issue 4 , Autumn 2017, Pages 269-282

http://dx.doi.org/10.22105/riej.2017.96349.1008

Abstract
  In this paper, a new multi-objective time-cost constrained resource availability cost problem is proposed. The mathematical model is aimed to minimize resource availability cost by considering net present value of resource prices in order to evaluate the economic aspects of project to maximize the quality ...  Read More

Engineering Optimization
2. Scheduling Project Crashing Time Using Linear Programming Approach: Case Study

K. Chitra; P. Halder

Volume 6, Issue 4 , Autumn 2017, Pages 283-292

http://dx.doi.org/10.22105/riej.2017.96572.1010

Abstract
  In today’s competitive environment completing a project within time and budget, is very challenging task for the project managers. This aim of this study is to develop a model that finds a proper trade-off between time and cost to expedite the execution process. Critical path method (CPM) is used ...  Read More

Fuzzy optimization
3. Modified Method for Solving Fully Fuzzy Linear Programming Problem with Triangular Fuzzy Numbers

S. K. Das

Volume 6, Issue 4 , Autumn 2017, Pages 293-311

http://dx.doi.org/10.22105/riej.2017.101594.1024

Abstract
  The Fuzzy Linear Programming problem has been used as an important planning tool for the different disciplines such as engineering, business, finance, economics, etc. In this paper, we proposed a modified algorithm to find the fuzzy optimal solution of fully fuzzy linear programming problems with equality ...  Read More

Engineering Optimization
4. Reviewing on Nanotechnology for Creating Antimicrobial for Chicken Feed: Max-Min Optimization Approach

A. H. Niknamfar; H. Esmaeili

Volume 6, Issue 4 , Autumn 2017, Pages 312-327

http://dx.doi.org/10.22105/riej.2017.100933.1021

Abstract
  Nanotechnology deals with studies of phenomena and manipulation on elements of matter at the atomic, molecular and macromolecular level (rangefrom1to100nm), where the properties of matter are significantly different from properties at larger scales of dimensions. Nanotechnology is science, engineering, ...  Read More

Operations Research
5. Produced Water Treatment Using a New Designed Electroflotation Cell

M. A. Abdel Khalek; F. I. El-Hosiny; K. A. Selim; I. Osama

Volume 6, Issue 4 , Autumn 2017, Pages 328-338

http://dx.doi.org/10.22105/riej.2017.100959.1022

Abstract
  A novel continuous electroflotation cell, about 0.6 liter volume capacity, using aluminum electrodes was designed for oil produced water treatment. The treating performance of a novel continuous electroflotation cell for oil produced water was investigated. The pH, current density, and feed water flow ...  Read More

Numerical Analysis
6. A Barzilai Borwein Adaptive Trust-Region Method for Solving Systems of Nonlinear Equation

F. Rahpeymaii; M. Kimiaei

Volume 6, Issue 4 , Autumn 2017, Pages 339-349

http://dx.doi.org/10.22105/riej.2017.101854.1027

Abstract
  In this paper, we introduce a new adaptive trust-region approach to solve systems of nonlinear equations. In order to improve the efficiency of adaptive radius strategy proposed by Esmaeili and Kimiaei [8], Barzilai Borwein technique (BB) [3] with low memory is used which can truly control the trust-region ...  Read More

Numerical Analysis
7. CAS Wavelet Function Method for Solving Abel Equations with Error Analysis

R. Ezzati; K. Maleknejad; E. Fathizadeh

Volume 6, Issue 4 , Autumn 2017, Pages 350-364

http://dx.doi.org/10.22105/riej.2017.100538.1017

Abstract
  In this paper we use a computational method based on CAS wavelets for solving nonlinear fractional order Volterra integral equations. We solve particularly Abel equations. An operational matrix of fractional order integration for CAS wavelets is used. Block Pulse Functions (BPFs) and collocation method ...  Read More