Manila Journal of Science 10 (2017), pp. 65-74

A Study of Knowledge, Attitude, and Practices Regarding Malaria Among Inhabitants of Ezinihite Local Government Area, Imo State, Eastern Nigeria


Accurate knowledge, attitudes, and practices of the individuals of a community remain vital to effective malaria control. The study assessed the knowledge, attitudes, and practices regarding malaria among respondents in selected communities of Ezinihite L.G.A. of Imo State using structured questionnaires. Four communities in Ezinihite L.G.A with indigenous malaria cases were randomly selected. All the household heads were visited prior to the study. A total of 443 respondents from the four communities participated. Sociodemographic data showed that the respondents were of different age groups and educational, marital, and occupational status. Read More

Manila Journal of Science 10 (2017), pp. 44-63

Quantum Chemical Studies on Corrosion Inhibition of 1, 3-Thiazine Derivatives for Mild Steel in Acidic Media: DFT Approach


Quantum chemical calculations via B3LYP/631G(d.p) level were performed on 1,3-Thiazine derivatives used as corrosion inhibitors for mild steel in acidic media. The calculated molecular properties such as the highest occupied molecular orbital energy (EHOMO), Lowest unoccupied molecular orbital (ELUMO), chemical hardness (ŋ), energy band gap (Eg), dipole moment, electronegativity (χ), fraction of electron transfer (ΔN), and global nucleophillicity index (ω) were correlated to the observed corrosion efficiency. Read More

Landslide Susceptibility Mapping

Landslide Susceptibility Mapping in a Geologically Complex Terrane: A Case Study From Northwest Mindoro, Philippines


Northwest Mindoro is underlain by inherently weak materials that are the product of arc-continent collision involving the Philippine Mobile Belt and the Palawan Microcontinental Block. Consequent to having an arc-continent collision setting, the frequent exposure to precipitation and the human-induced pressure on the environment is the occurrence of landslides in the island. Because of the complicated tectonic makeup of the area and the complex controls to slope failures, a variety of approaches to landslide susceptibility assessment was used and compared. Read More

Manila Journal of Science 10 (2017), pp. 16-24

A Sum Labelling for Some Families of Unicyclic Graphs


In 2008, H. Fernau et al. provided an optimal sum labelling scheme of the generalized friendship graph and showed that its sum number is 2. The generalized friendship graph is a symmetric collection of cycles meeting at a common vertex. This graph fq,p may also be viewed as a graph obtained by considering several copies of a cycle and identifying a vertex from each cycle and merging them into a single vertex. Read More

Manila Journal of Science 10 (2017), pp. 1-15

Oscillation Propagation in a Two-Dimensional Lattice of Mutually Repressive Nodes


Concurrent decision-making networks represent decision systems where the utility of a component (node) becomes dominant by repressing other nodes. These networks are commonly used in modeling competitive interactions in the computational, biological, and social sciences. Most of the existing studies about concurrent decision-making focus on equilibrium convergence of the utilities. However, there are many cases where oscillations can arise. Here, we consider concurrent decision-making networks that follow a two-dimensional lattice topology where one node is a source of oscillations. Read More


Density Functional Theory–Based Study of the Structural Properties of Hexagonal Boron Nitride/Graphene Hetero-Bilayer and Silicene/Hexagonal Boron Nitride/Graphene Hetero-Structures for Thin Film Transistor Applications


The geometric properties and structural stability of hexagonal boron nitride on graphene (h-BN/G) hetero-bilayer and silicene on hexagonal boron nitride on graphene (Si/h-BN/G) hetero-structure were investigated using density functional theory. The calculations were performed through the Vienna Ab Initio Simulation package (VASP) implemented with three different approximations, namely, the local density approximation (LDA), general gradient approximation (GGA), and GGA with Tkatchenko–Scheffler van der Waals (vdW) correction. In reference to the experimental interlayer distance and binding energy between graphitic layers, the h-BN/G hetero-bilayer and Si/h-BN/G hetero-structures were stable. Read More

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Comparative Analysis on Lettuce Quality Produced From Urban Agriculture and Organic Farming


A previous project has proven that urban agriculture is feasible and more environment friendly than traditional agriculture. The question if the yield of urban agriculture through hydroponics is comparable to organic farming or not arose. Evidence gathered showing comparability should provide added value to the products of urban agriculture. This can in turn make the practice of urban agriculture not only more profitable but also more attractive. A hydroponics setup was placed in the rooftop of St. Joseph Hall of De La Salle University in Manila. The organic farming setup was placed in the grounds of De La Salle University in Dasmariñas City, Cavite. Read More

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Survey on the Current Status of Serial and Parallel Algorithms of Frequent Itemset Mining


Frequent itemset mining is one of the fundamental but time-demanding tasks in data mining. It is used to find frequent patterns and generate association rules for these patterns. With the availability of inexpensive storage and progress in data capture technology, the availability of data has reached exa-scale already. But improvements in processor and network technology open up opportunity for parallel and distributed computing to be applied in frequent itemset mining to improve its performance in the light of the challenge of “big data”. Thus, there are challenges in frequency itemset mining to fully harness the parallel processing capability of the computer hardware technologies. Read More

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On the pH and Acid Neutralizing Capacity Profile of Manila Bay Coastal Water Samples in Manila, Philippines


For any body of water, its pH and acid neutralizing capacity (ANC) are two important determinants of its overall condition. The ANC has to be high enough to maintain the pH at an optimal level in order to resist acidification and thereby sustain marine life. An assessment of the pH and ANC of Manila Bay coastal waters along Manila and Pasay, Philippines, was done using 16 collected coastal water samples from four different and equally divided geographic sectors along Roxas Boulevard. The pH of the samples was measured using a pH meter while the ANCs were determined via potentiometric titration against sulfuric acid (H2SO4). Read More