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Plaza A.B.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Buenavista A.D.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Menchavez R.L.,MSU Iligan Institute of Technology andres Bonifacio Avenue
Ceramics International | Year: 2014

This study presents a simultaneous application of pressure cooking and microwave irradiation to consolidate ceramic slurry as a rapid shaping technique. The ceramic slurry, composed of red clay, feldspar, quartz and water, was solidified with the gelatinization of starch under varying heating conditions inside a domestic microwave pressure cooker. It was found out that, for a small amount of ceramic slurry, a shortest heating time of 2.52 min was achieved at microwave pressure cooking conditions of 50% power level and target temperature of 60 °C. Based on these conditions, large shaped ceramic prototypes of different shapes were successfully formed using proposed empirical equations to determine a desired heating time at any power levels. The physical characterizations revealed that the physical properties of dried and fired ceramic bodies formed under microwave pressure cooking were better than that of the conventional counterpart. Microstructural investigation into the fired samples revealed larger void spaces in conventional sample than that in microwave pressure-cooked sample. © 2014 Elsevier Ltd and Techna Group S.r.l.


Salaan C.J.O.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Victoria M.J.M.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Estoperez N.R.,MSU Iligan Institute of Technology andres Bonifacio Avenue
International Journal of Advanced Mechatronic Systems | Year: 2013

This study introduced a real-time reactive power controller based on artificial neural network with web-based monitoring. A feed-forward employing back-propagation was used as training technique. The inputs to the network were the active and reactive power of each load. The targets were to switch on/off the capacitor banks during normal and abnormal conditions. The network was trained using developed MATLAB program and the weights resulted to minimum mean-square-error were fed to the microcontroller unit. The method was then tested in a three-bus radial distribution system model and implemented using Zilog microcontroller. The system actions were monitored using web-based monitoring application. The method was validated in actual operation of the system using the test data and results were satisfactorily obtained. Copyright © 2013 Inderscience Enterprises Ltd.


Moneva C.S.O.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Torres M.A.J.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Demayo C.G.,MSU Iligan Institute of Technology andres Bonifacio Avenue
AACL Bioflux | Year: 2012

Shell morphology has various details in their architecture that contributes effectively to gastropod identification and classification. A conventional approach has been made to study shell morphology using descriptions of biological shapes. However, descriptions can be strengthened by applying additional quantitative tools. Relative Warp Analysis and Correlation Analysis based on Distances (CORIANDIS) were used to determine shell shape divergence and ascertain factors associated with the shell shape variation in three species of the genus Melanoides of the family Thiaridae namely, Melanoides granifera, Melanoides maculata, and unknown Melanoides species belonging to the family Thiaridae. Relative warp summarizes the vectors of shape variation within samples. CORIANDIS on the other hand, examines similarities among samples and interpreted in terms of congruence among traits. Results of the relative warp analysis showed significant shell shape variation among the Thiaridae species in the height of the spire, aperture, and apical shapes. Distance matrices were also constructed for the three data sets of shell characters: ventral/aperture, dorsal, and top/whorl shell. Results of the comparison via correlation analyses of distances among the species showed that an unknown Melanoides species is closely related to M. maculata than M. granifera. The results of the present study clearly show the importance of geometric morphometric analysis determination of systematic relationship in Thiarid snails.


Moneva C.S.O.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Baquiano P.M.L.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Blasco J.O.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Borlaza K.M.E.,MSU Iligan Institute of Technology andres Bonifacio Avenue | And 5 more authors.
AACL Bioflux | Year: 2014

The shell is the most distinct feature of bivalves, which exhibits a large degree of variation in terms of morphology. Recognition of bivalve variability is important for the effective culture of these organisms. Traditional approach has been made to study shell morphology using differences in length and color. However, conventional methodology can be strengthened by applying additional quantitative tools. A more recent and advanced approach in investigating morphological shell shape patterns were incorporated in the present study. Using Geometric Morphometric (GM) Analysis, the right and left valve interiors of the three species of bivalves from family Veneridae - Lyrate asian hard clam (Meretrix lyrata), Quahog or little neck (Mercenaria mercenaria), and Manila clam (Venerupis philippinarum) from Tubod, Lanao del Norte, Philippines were explored for phenotypic variations. Fifteen (15) anatomical landmark test was performed – covering characteristics of the umbo, hinge, muscle scars, pallial line and pallial sinus. Multivariate Analysis of Variance (MANOVA)/Canonical Variance Analysis (CVA) scatter plot was used to graphically present the clustering of each species. Moreover, Relative Warp Analysis (RWA) and Kruskal–Wallis Test, was used to obtain consensus morphology of the three species and their variations along the negative and positive axes, and to test if there are significant differences on the anatomical landmark of the three species, respectively. Results in MANOVA yielded significant differences in the three species, CVA showed a distinct clustering of species population, and Kruskal–Wallis supported this clustering by obtaining significant results. The analyses showed that the umbo position, orientation of the muscle scar, relative deepness of the pallial sinus, and pallial line length are significantly different in M. lyrata, M. mercenaria and V. philippinarum. The morphological differences on their anatomical landmarks are consequences adaptation to their specific environmental preferences. The results of the present study can provide more information about the ecology and characteristics of the three species and use this information to devise techniques that can manipulate production yield without the expense of the life of other animals and the whole biodiversity. © 2014, BIOFLUX SRL. All right reserved.


Potestas M.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Alguno A.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Vequizo R.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Sambo B.R.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Odarve M.K.,MSU Iligan Institute of Technology andres Bonifacio Avenue
IOP Conference Series: Materials Science and Engineering | Year: 2015

Growth of zinc sulphide (ZnS) nanostructures on silica modified-polyaniline (SM-PAni) with polymerization time-dependent was prepared using chemical bath deposition (CBD) technique. The grown samples were characterized by scanning electron microscopy (SEM) equipped with energy dispersive X-ray spectroscopy (EDS) and fourier transform infrared spectroscopy (FTIR). SEM images revealed that polyaniline rod-like nanostructures and ZnS nanospheres were successfully grown. The average diameter of the grown ZnS nanospheres did not significantly change by changing the growth time of the polyaniline. However, ZnS nanospheres grown with longer polymerization time of PAni is less dense and loosely bound as compared to shorter polymerization time of PAni. The less density of ZnS nanostructures with longer polymerization time of PAni may be due to the presence of PAni agglomerates that hinders the growth of ZnS nanospheres. Furthermore, FTIR spectra confirmed that the grown polyaniline is of emeraldine salt oxidation state which is the most conductive state of PAni.


Menchavez R.L.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Adavan C.R.M.,MSU Iligan Institute of Technology andres Bonifacio Avenue | Calgas J.M.,MSU Iligan Institute of Technology andres Bonifacio Avenue
Materials Research | Year: 2014

The consolidation of red clay-based slurry by gelatinization of starch in a domestic pressure cooker was presented. Aqueous ceramic slurries were prepared consisting of a ternary powder mixture of red clay, quartz, feldspar, and different starch types. The starch slurries with and without the presence of ceramic particles demonstrated the same gelling mechanism and heating time inside the pressure cooker. The gel strengths of pressure-cooked samples were higher than samples heated conventionally. Subsequently, the shaping of large ceramic prototypes is possible using a calculated heating time based on best pressure cooking conditions. The physical characterizations disclosed that the pressure-cooked ceramic samples in dried and fired states exhibited better physical properties depending upon the type of starch added in the ceramic slurry. Specifically, the compressive strengths of fired ceramic bodies shaped in the pressure cooker ranged from 82 ± 2 to 255 ± 9 MPa with bulk porosities of 29.0 ± 0.8-18.7 ± 0.2%, whereas the conventionally shaped bodies possessed compressive strengths ranging from 138 ± 8 to 164 ± 11 MPa with bulk porosities of 25.6 ± 0.1-28.5 ± 0.2%.

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