SDinside front cove-july-december 2014.pmd


              July-December 2014  •  Vol. 26  No. 2

INTERNATIONAL ADVISORY BOARD

Science Diliman
        ISSN 0115-7809

SCIENCE DILIMAN is published semi-annually (June
a n d  D e c e m b e r )  b y  t h e  U n i v e r s i t y  o f  t h e
Philippines Diliman through the Off ice of the
Vice-Chancellor for Research and Development.
The journal features articles of pure and applied
sciences.

Editorial Board

Editor-in-Chief
Marco Nemesio E. Montaño, PhD

Associate Editors
Jose Maria P. Balmaceda, PhD
Carlos Primo C. David, PhD
Joel Joseph S. Marciano Jr. , PhD
Jonas P. Quilang, PhD
Arnel A . Salvador, PhD
Irene M. Villaseñor, PhD

Managing Editor
Gonzalo A. Campoamor II, PhD

Editorial Assistant
Narita E.C. de las Alas

Layout Artist
Dercylis G. Mararac

Copyeditor
Patricia S. San Jose

On the Cover:
A 2-uniform tiling of the plane by squares and
equilateral triangles wherein a set of tiles of the
same color form the same pattern as other sets of
colored tiles. Moreover, the symmetry group of the
tiling induces a permutation of the colors. The
coloring is a transitive and perfect coloring using 9
distinct colors. Description of the image by Lawrence
A. Eclarin of Mariano Marcos State University

Rigoberto C. Advincula, PhD
Department of Chemistry
University of Houston

Alfonso M. Albano, PhD
Department of Physics
Bryn Mawr College, Bryn Mawr, Pennsylvania

Kenneth Buckel, PhD
Food Science and Technology Group
School of Chemical Sciences and Engineering
The University of New South Wales
Sydney,  Australia

Jose B. Cruz, PhD
Department of Electrical and
     Computer Engineering
Ohio State University

Flor Crisanta F. Galvez, PhD
Quality Assurance and Technical Manager
Kerry Ingredients and Flavours (Americas
     Region)
7989-82nd St. , Delta, VC V4G 1L7, Canada

Victor C. Gavino, PhD
Department of Nutrition
University of Montreal, Canada

Kelvin S. Rodolfo, PhD
Department of Earth and Environmental
     Sciences
University of Illinois, Chicago, Illinois

Rudolf A. Roemer, PhD
Centre for Scientif ic Computing and
     Department of Physics
University of Warwick

Luis G. Sison, PhD
Electrical and Electronics Engineering
     Institute
University of the Philippines Diliman

Raul K. Suarez, PhD
Department of Ecology,  Evolution
     and Marine Biology
University of California, Sta. Barbara

Contents of this journal may not be reproduced without the
publisher’s written permission except for fair use, i.e., for personal,
educational and research purposes, in accordance with copyright
law. Reprinting and republication in any other journal or
compilation is likewise prohibited except as provided in the
Publication Agreement when the author reprints his/her article
for inclusion in any publication where he/she is the author or
editor, subject to giving proper credit to the original publication
of the article in the journal.

The views expressed in the articles are those of the authors and do
not necessarily reflect the views of the publisher and the editors.