Manila Journal of Science 11 (2018), pp. 58–67

Bound-State Solutions of the Schrödinger Equation with Woods–Saxon Plus Attractive Inversely Quadratic Potential via Parametric Nikiforov–Uvarov Method


We study the bound-state solutions of the Schrödinger equation with Woods–Saxon plus attractive inversely quadratic potential using the parametric Nikiforov–Uvarov method. We obtained the bound-state energy eigenvalues and the corresponding normalized eigenfunctions expressed in terms of hypergeometric functions. Read More

Manila Journal of Science 11 (2018), pp. 68-74

Manganese–Ketopinic Acid–Derived Catalyst for Aldol Condensation Reactions

Aldol condensation reactions of benzaldehyde with various aliphatic ketones was catalyzed by a new manganese–ketopinic acid–derived complex to furnish products with excellent yield (>99%).

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Manila Journal of Science 11 (2018), pp. 22-31

Aircraft Noise Assessment in a Mixed Urban–Residential Hamlet and the Possible Role of Tree Cover in Noise Abatement in Pajac, Lapu-Lapu City, Philippines

Pollution is a big issue in the Philippines. However, the country has not focused its attention towards noise pollution. This study assessed the noise intensity of a hamlet located very near the airport, where aircraft takeoffs and landings occur daily. It compares the noise intensity (in decibels) between areas with tree cover and those without. Read More


Anti-G-Hermiticity Preserving Linear Map That Preserves Strongly the Invertibility of Calkin Algebra Elements



A linear map ψ : X → Y of algebras X and Y preserves strongly invertibility if ψ(x−1) = ψ(x)−1 for all x X−1, where X−1 denotes the set of invertible elements of X. Let B(H) be the Banach algebra of all bounded linear operators on a separable complex Hilbert space H with dim H = ∞. A Calkin algebra C(H) is the quotient of B(H) by K(H), the ideal of compact operators on H. An element A + K(H)C(H) is said to be anti-G-Hermitian if (A + K(H))# = −A + K(H), where the #-operation is an involution on C(H). A linear map 𝜏 : C(H) → C(H) preserves anti-G-Hermiticity if 𝜏 (A + K(H))# = −𝜏 (A + K(H)) for all anti-G-Hermitian element A + K(H)C(H). Read More

. Posted on October 30, 2017 by Manila Journal of Science
Manila Journal of Science 11 (2018), pp. 11-21


Prevalence, Antigenic Recognition and IgG Antibody Response in Pigs Infected with Sarcoptes scabiei var. suis in Confined Pens



Hog mange is a serious pruritic dermatitis caused by the itch mite Sarcoptes scabiei var. suis. The itch mite has remained a severe ectoparasite of utmost importance to the pig industry, especially with the environment promoting its spread. The ubiquity cum difficulty in diagnosing and treatment has led to great economic losses. This study aimed at evaluating the prevalence and antigenic recognition spectra of confined pigs in a resource poor community in Ogbomosho, South-West Nigeria. Read More

. Posted on October 13, 2017 by Manila Journal of Science
Manila Journal of Science 11 (2018), pp. 1-10

Giardiasis and its Associated Risk Factors Among School Children in Selected Rural Communities in South Eastern Nigeria


The study was conducted to determine the prevalence of giardiasis among school children in Afikpo North Local Government Area, Ebonyi State, Nigeria. The study was carried out from June to October, 2015. Direct smear, iodine wet mounts, and the formol-ether concentration technique were used to analyze the stool samples. Out of 600 stool samples from pupils aged 5-16 years from six primary schools examined, 30 (5.0%) were infected. Read More

Manila Journal of Science 10 (2017), pp. 131-135

Updates on the Cecilia P. Reyes Collection of Philippine Thrips (Insecta: Thysanoptera)


The Cecilia P. Reyes Collection of Philippine thrips consists of 38 new species involving 9 new genera, namely, Amphidoxothrips Reyes, Filipinothrips Reyes, Gemmathrips Reyes, Hemingia Reyes, Praeciputhrips Reyes, Propealiothrips Reyes, Propesolomonthrips Reyes, Psephenothrips Reyes, and Rosingothrips Reyes, and hundreds of thrips specimens known to science. The insects were collected from different localities in Luzon including Mindoro and Palawan, Visayas, and Mindanao (Reyes, 1994, 1996, & 1997). Read More

Manila Journal of Science 10 (2017), pp. 126-130

On Modular Signatures of Some Autographs


Let G = (V, E) be a graph where the edge set E can be a multiset. If there exists a bijection α: V → S(G) where S(G) is a multiset of real numbers such that uvE if and only if |α(u) − α(v)| = α(w) for some wV, then α is called an autograph labeling of G. The multiset S(G) = {α(v) : vV} is called a signature of G. If the underlying set of S(G) is {0,1,2,…,n − 1} where n = |V|, then S(G) is called a modular signature of G. Read More

Manila Journal of Science 10 (2017), pp. 114-125

Surface Analysis of Silicon (100) Wafer After Contact Electrification Using Kelvin Force Microscopy


Contact electrification was demonstrated on Si (100) wafer, and surface charge images at submicron scale were analysed using Kelvin force microscopy (KFM). Potential map images have shown carpet-like patterns on the (100) plane of Si wafer. Individual potential spikes that appeared on the surface are indicative of the presence of charges arising from contact electrification. Read More