Browsing College of Science by Issue Date

Analysis of age-structured malaria transmission model

Addawe, Joel M.; Lope, Jose Ernie C. (Philippine Science Letters, 2012)

In this paper, we propose a model to study the dynamics of malaria in an age-structured human host. Our model divides the human population into two compartments: pre-school (0-5 years) and the rest of the human population. ...

Factorizations of Lorentz Matrices

Gueco, Edna N.; Merino, Dennis I.; Paras, Agnes T. (Mathematical Society of the Philippines, 2012)

Surface morphology, optical properties and antibacterial activity of zinc oxide films synthesized via spray pyrolysis

Cuevas, Andrea Gracia; Balangcod, Kryssa; Balangcod, Teodora; Jasmin, Alladin (Elsevier Ltd., 2013)

Zinc oxide (ZnO) films were synthesized using spray pyrolysis using glass as substrate at substrate temperature of 400°C. The precursor used is an aqueous solution of ZnCl2. The deposition was done in ambient conditions. ...

Stability and Bifurcations in Delayed Three-Species Model

Collera, Juancho A. (2013)

In this study, a system of delay differential equations arising from a three-species model with two predators feeding on a single prey is considered. It is assumed that the prey population grows logistically in the ...

Antibacterial potential of some medicinal plants of the Cordillera Region, Philippines

Gutierrez, Rosemary M.; Baculi, Ronan Q; Pastor, Nardo; Puma-at, Timothy; Balangcod, Teodora (Indian Journal of Traditional Knowledge, 2013-10)

Since plants have been the source of a large percentage of prescription drugs, it is very important that the antimicrobial properties of medicinal plants be investigated because these plants could be a resource for new and ...

On the First-Order Shape Derivative of the Kohn-Vogelius Cost Functional of the Bernoulli Problem

Bacani, Jerico B.; Peichl, Gunther (Hindawi Publishing Corporation, 2013-11-01)

The exterior Bernoulli free boundary problem is being considered. The solution to the problem is studied via shape optimization techniques. The goal is to determine a domain having a specific regularity that gives a minimum ...

Another Class of Admissible Perturbations of Special Expressions

Bacani, Jerico B. (2014)

ON THE DIOPHANTINE EQUATION 3x + 5y + 7z = w2

BACANI, JERICO B.; RABAGO, JULIUS FERGY T. (2014)

We exhaust all solutions of the Diophantine equation 3x + 5y + 7z = w2 in non-negative integers using elementary methods.

DIFFERENTIAL EVOLUTION - SIMULATED ANNEALING (DESA) ALGORITHM FOR FITTING AUTOREGRESSIVE MODELS TO DATA

Addawe, Rizavel C.; Magadia, Joselito C. (2014-06)

In this paper, we propose Differential Evolution - Simulated Annealing (DESA), a hybrid optimization algorithm for fitting autoregressive models to data. The addition of a new strategy based on parabolic estimation to ...

On the Shape Gradient and Shape Hessian of a Shape Functional Subject to Dirichlet and Robin Conditions

Bacani, Jerico B. (2014-07-29)

This paper focuses on minimizing a shape functional through the solution of a Pure Dirichlet boundary value problem, and a Dirichlet-Robin boundary value problem. This shape optimization problem is a variant of the ...

The Second-Order Shape Derivative of Kohn–Vogelius-Type Cost Functional Using the Boundary Differentiation Approach

Bacani, Jerico B.; Peichl, Gunther (2014-09-26)

A shape optimization method is used to study the exterior Bernoulli free boundary problem. We minimize the Kohn–Vogelius-type cost functional over a class of admissible domains subject to two boundary value problems. The ...

Antioxidant potentials of culturable endophytic yeasts from Phragmites australis Cav. (Trin) ex Steud. from copper-contaminated mining site in Mankayan, Benguet

Hipol, Roland M. (2014-10-12)

Three endophytic yeasts were isolated from the lower stem and roots of Phragmites australis Cav. (Trin) ex Steud., observed to be dominant along the banks of the tailings pond 5A of the Lepanto Consolidated Mining Co. in ...

Symmetry-breaking bifurcations in two mutually delay-coupled lasers

Collera, Juancho A. (2015)

We consider a symmetric system of delay differential equations arising from a model of two mutually delay-coupled semiconductor lasers. The system is described using the Lang-Kobayashi rate equations whose basic solutions ...

Prokaryotic Community Analysis of a Hyperalkaline Spring in the Philippines Using 16S rRNA Gene Clone Library Construction

Baculi, Ronan Q.; Lantican, Nacita B.; de los Reyes, Francis L. III; Raymundo, Asuncion K. (2015-06)

The prokaryotic diversity associated with serpentinization-driven Manleluag Hyperalkaline (pH 11) Spring in Pangasinan, Philippines was investigated. DNA extracted directly from the sediment samples was used to construct ...

Highly efficient photocatalysis by partially reduced graphene oxide (prGO) – zinc oxide composite synthesized via one-pot room-temperature chemical deposition method

Agulo, Ian Jasper A.; Ngaloy, Roselle T.; Fontanilla, Aixeen M.; Soriano, Ma. Rebecca; Matsushita, Yoshitaka; Pascua, Chelo S. (2017-03)

Zinc oxide – reduced graphene oxide (ZnO-rGO) composites was synthesized using a one-pot chemical deposition method at room temperature. Zinc dust and graphene oxide (GO) were used as precursors in a mildly alkaline solution. ...

Biomechanical Analysis of the Pointing Skill in Petanque using the Roll Technique at 6,7,8 and 9 Meters

Inovero, Jennifer G.; Rayos, Rafael Lorenzo; Agulo, Ian Jasper (2017-06)

Introduction: In sports, motion capture has been used to record an athletes’ movement in real time and analyze certain variables as physical condition, sport performance and injury mechanism, prevention and rehabilitation. ...

Electrowetting Actuation of Polydisperse Nanofluid Droplet

Patacsil, Crismar; Enriquez, Erwin; Guerrero, Raphael (2017-06)

We present results of electrowetting experiments employing droplets formed from aqueous suspensions of gold nanoparticles. A planar electrowetting system, consisting of a platinum wire electrode and a bottom copper electrode ...

Dynamics of a Stage-Structured Intraguild Predation Model

Collera, Juancho A.; Magpantay, Felicia Maria G. (2017-08-20)

Stability and Bifurcation Analysis of Three-Species Predator-Prey Model with Non-monotonic Delayed Predator Response

Balilo, Aldrin T.; Collera, Juancho A. (2017-08-27)

Nitrogen fixing bacterial populations associated with biological soil crusts and reclaimed precipitates from an acid mine drainage site and their potential for mine land reclamation

GUTIERREZ, ROSEMARY M.; ROJAS-ALVARADO, CLAUDIA M.; BRUNS, MARY ANN V. (2017-09)

Very few studies have described the presence of nifH genes in degraded mine lands, and the use of nitrogen fixing microorganisms such as cyanobacteria in mine land reclamation has received little consideration especially ...

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