ACADEMIC PUBLICATIONS BOARD Prof. Amer A. Al-Rawas, Chairman Prof. Hadj Bourdoucen Prof. Michel Claereboudt Prof. Maher M. Hilal Prof. Khaled N. Day Prof. Lamk M. Al-Lamki Prof. Mohammed N. Elsarayrah Prof. Muhammad S. Khan Mr. Ali N. Al-Hadhrami EDITORIAL BOARD Editor-in-Chief Prof. Hadj Bourdoucen Electrical & Computer Engineering Department Sultan Qaboos University, Oman Editor Prof. Tasneem Pervez Mechanical & Industrial Engineering Department Sultan Qaboos University, Oman Associate Editors (S.Q.U., Oman) Civil & Architectural Eng. Prof. Khalifa S. Al-Jabri Prof. Ali S. Al-Harthy Dr. Yahia Mohamedzein Dr. Ahmed Sana Dr. Ali S. Al-Nuaimi Dr. Ranjith Perera Dr. Mahad S. Baawain Dr. Sherif El-Gamal Electrical & Computer Eng. Dr. Nasser Hosseinzadeh Prof. Ibrahim Metwally Prof. Abdullah H. Al-Badi Prof. Mohamed Ould-Khaoua Dr. Afaq Ahmed Dr. Lazhar Khriji Dr. Hassan Yousef Dr. Hisham Soliman Dr. Mustafa Mesbah Mechanical & Industrial Eng. Dr. Nabeel Z. Al-Rawahi Dr. Jamil Abdo Dr. Khalid Zebdah Dr. Zahid Qamar Dr. Amur S. Al-Yahmedi Dr. Nasser A. Al-Azri Dr. Nassr H. Al-Hinai Petroleum & Chemical Eng. Dr. Rashid S. Al-Maamari Dr. Yahia M. Al-Wehaibi Dr. Gholamreza Vakili-Najed Dr. Ala’a Hamed Al-Muhtaseb Dr. Hasan Abdellatif Hassan Dr. Majid A. Al-Wadhahi Water Research Centre Prof. Joydeep Dutta INTERNATIONAL EDITORIAL ADVISORY BOARD Civil & Architectural Eng. Prof. Imad Al-Qadi, USA Prof. Louay Mohammed, USA Prof. Vijaya Rangan, Australia Electrical & Computer Eng. Prof. Chem Nayar, Australia Prof. Mahmoud M. Dawoud, KSA Prof. Nobuyuki Matsui, Japan Mechanical & Industrial Eng. Prof. Afshin Ghajar, USA Prof. Ahmed Al-Garni, KSA Prof. Bassam Jubran, Canada Prof. Mehmet Savsar, Kuwait Prof. Mustapha Yagoub, Canada Prof. Sam Zamrik, USA Prof. Yildirim Omurtag, USA Prof. Martin I. Pech-Canul, Mexico Petroleum & Chemical Eng. Prof. Jai Gupta, India Prof. Mehmet Hastaoglu, Turkey Prof. Ramazan Kahraman, KSA Prof. Richard Korff, Germany Prof. Samuel Kozaitis, USA Prof. Turgay Ertekin, USA Web Editor Mr. Mehdi Ali Amiri Kordestani Technical Editor Mr. Pyata Hanumantha Rao The Journal of Engineering Research (TJER) AIM & SCOPE The Journal of Engineering Research (www.tjer.net) is a refereed international publication of Sultan Qaboos University. The Journal aims to provide a medium through which engineering researchers and scholars from around the world are able to publish their scholarly applied and/or fundamental research. Contributions of high technical merit are to span the breadth of engineering disciplines. They may cover, the main areas of engineering: Electrical, Electronics and Computer Engineering, Information Engineering and Technology, Mechanical, Industrial and Manufacturing Engineering, Aerospace Engineering, Automation and Mechatronics Engineering, Materials, Chemical and Process Engineering, Civil and Architecture Engineering, Biotechnology and Bio-Engineering, Environmental Engineering, Biological Engineering, Genetic Engineering, Petroleum and Natural Gas Engineering, Mining Engineering and Marine and Agriculture Engineering. ACCEPTANCE AND REVIEWING PROCESS All papers submitted to the Journal will be subjected to rigorous reviewing by a minimum of two reputable referees who are technically competent to evaluate the subject matter. Upon the acceptance of the contribution for publication it is possible that papers may be subject to minor editorial amendments. However, authors are solely responsible for the originality and accuracy of the findings in their papers. Statements, results and findings published in the Journal are understood to be those of the authors, not those of the Editorial Board or the publisher. SUBMISSION OF MANUSCRIPTS Submission of manuscripts in soft (electronic) format is preferred. Author(s) are requested to send an e-mail with an electronic version of the manuscript. Submissions should be sent directly to: Editor-in-Chief, The Journal of Engineering Research, College of Engineering, Sultan Qaboos University, P. O. Box 33, Al-Khoud 123, Muscat, Sultanate of Oman. E-mail: Chief-Editor@tjer.net or raoh@squ.edu.om TJER is currently Indexed in Scopus The Journal of Engineering Research (TJER). All rights reserved. This journal is not responsible for opinions printed in its publication: They represent the views of the individuals to whom they are credited and are not binding upon the journal. Sultan Qaboos University Press, Muscat, Sultanate of Oman, 2014 Notes for Authors MANUSCRIPT PREPARATION Length of Manuscript Papers submitted for publication in TJER could be up to ten printed pages or 24 to 30 double spaced papers. The template for MS-WORD as per TJER format may be downloaded from http://www.tjer.net. It is advisable that authors use this template in order to reduce the amount of time spent on typesetting the manuscript. The font sizes and the manuscript specifications are outlined as follows. Typing and Font Specification Manuscripts should be typed double-spaced on one side of a sheet only, with margins of about 2.5 cm on each side of each page. The font should be Times New Roman for all the components of the manuscript with font size of 12 pt and regular attribute for the body of the text. Elements of the Manuscript Full length papers generally consist of the title, author(s) affiliation(s), abstract, keywords, nomenclature if applicable, introduction, body, conclusion, references, list of figures and table captions, and original figures and tables for reproduction. A paper may also include appendices and acknowledgments. Titles Capitalize the first letter of each word, i.e. use title case. Author Names and Affiliation(s) Author names on technical papers should include the name of each author followed by his/her company affiliation. If two or more authors have the same company affiliation, it should not be repeated after each name. Do not use titles such as Mr., Mrs., Ms., Miss, Prof. or Dr. Abstract The abstract should be limited to 300 words and must concisely state what was done, how it was done, principal results, and their significance. The abstract will appear later in various indices of abstracts and should contain the most critical information within the paper. Keywords Leave two blank lines after the abstract and type 6-10 key words and phrases (separated by semicolons) that can be used to index the paper, listing the keywords in order of importance for indexing. Do not repeat words or strings of words from the title. Capitalize the first letter of each word. Acknowledgments The same format as the body of the text should be followed. Nomenclature A separate nomenclature section should list in detail the symbols used in the manuscript, their definitions, and their units in SI system. The nomenclature list should be an alphabetical order with Greek symbols following the alphabetical listing. Subscripts and superscripts should follow Greek symbols and should be identified with a heading. References The references should be included at the end of the manuscript in a separate section named References without a number. All references must be listed alphabetically by first name of the first author. Ensure that the reference information is complete and accurate, including as necessary and in the following order: first names and initials of all authors; year of publication; title of paper, report, or book chapter (in quotes); title of book or periodical (in italics); volume and issue numbers; name and location of publisher (for books), name and location of publisher or sponsor (for proceedings), or city of publication and inclusive page numbers. Figures All figures must be cited in the body of the paper. Figures should be numbered in Arabic numerals in the order in which they are cited. Related figures or figure sections may be labeled with a shared numeral and consecutive lowercase letters (eg. Figs. 1a through 1d). Figures should be the smallest size possible without loss of clarity, preferably designed to occupy a single column (8.2 cm of width) of a printed journal page. Once the paper is accepted for publication, separate file for each figure in .tif or .tiff format is to be submitted to the technical editor for final printing. Tables All tables must be cited in the body of the paper. Tables should be numbered in Arabic numerals in the order they are cited in the paper. Tables should be the smallest size possible without loss of clarity. Table headings and column headings should be as concise as possible. Column alignment should be obtained using tabs NOT spaces. Tables should be designed to occupy a single column or the full width of the page. Care should be taken to avoid any arrangement that unduly increases the depth of a table. Use 10-point Times New Roman bold, centered, for table headings and 10-point Times New Roman for body in tables. Mathematical Notations and Equations To avoid errors in editing and typesetting, authors should clearly identify subscripts, superscripts, Greek letters, and other symbols. Equations should be numbered using Arabic numerals placed in parentheses. Break equations to fit within the page. Avoid ambiguities in equations and fractions in text through careful use of parentheses, brackets, solids (slants), etc. Note that in-text, fractions are usually “broken down” to fit in one line and confusion can result if terms are not properly labeled. The conventional order of brackets is {[0]}. Units and Abbreviations The International System of Units (SI units) is required. Unit symbols should be used with measured quantities, ie. 1 mm, but not when unit names are used in text without quantities, ie. “a few millimeters.” Acronyms and abbreviations should be defined the first time they are used in the text.