Manila, Philippines
Manila, Philippines

FEATI University is a private non-sectarian co-educational higher education institution with a Catholic orientation established in 1946 in Santa Cruz, Manila, Philippines. FEATI was formerly known as the Far Eastern Aeronautics School. Wikipedia.

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Rosario L.M.D.,University of the Philippines at Diliman | Rosario L.M.D.,FEATI University | Salapare H.S.,University Cote dAzur | Salapare H.S.,University of the Philippines | And 3 more authors.
Materials Chemistry and Physics | Year: 2017

Roughness parameters are traditionally obtained for the surface characterization of microfluidic devices as these are easily computed from height profiles. However, these provide limited topological information on channel geometry needed for fluid flow or fluid retention optimization. In this study, topological measures from Minkowski functionals and cluster analysis were evaluated if these can detect percolating channels or fluid traps in plasma-etched surfaces. Unlike Minkowski functionals, cluster analysis distinguished the onset of microchannel formation from the discontinuous percolation transition. The size of the irregularly shaped microchannel was obtained from the percolation order parameter (P). Thus, P may be used as a topological measure for the automatic detection and geometry evaluation of channels and cavities for various microfluidic applications. Besides percolation, Minkowski functionals and cluster analysis may be used to obtain fractal properties of nano-patterns for nanofluidic device design. © 2017 Elsevier B.V.

Gabriel A.A.,University of the Philippines at Diliman | Ugay M.C.C.F.,University of the Philippines at Diliman | Siringan M.A.T.,University of the Philippines at Diliman | Rosario L.M.D.,University of the Philippines at Diliman | And 4 more authors.
Innovative Food Science and Emerging Technologies | Year: 2016

This study established the efficacy of atmospheric pressure plasma jet on Pseudomonas aeruginosa on stainless steel types 316 and 304; with different finishes namely, mirror (MR), hairline (HL) and 2B surfaces. A cocktail of four strains of P. aeruginosa in the mid-stationary growth phase were allowed to attach on the test surfaces, and subjected to atmospheric pressure plasma jet treatment with an air injection rate of 5 l/min, output power of 360 W at 4.22 cm source-to-surface distance. Attachment rates were significantly affected by surface finish, rather than by stainless steel type. The D-values on the 316 stainless steel type ranged from 2.53 s (MR) to 3.16 s (2B); while those on the 304 type ranged from 1.95 s (HL) to 3.27 s (2B). Variations in D-values were observed between surface finishes within a specific stainless steel type. However, significant variations were not observed between the same surface finish of different steel types. The observed antimicrobial efficacy was attributed to the generation of reactive oxygen species, ultraviolet-C rays, and rapid temperature increase (final temperature of 143.42 °C to 174.05 °C) within 15 s of treatment. In the absence of heating, the D-value increased to 16.45 s, but a 5-log (99.999%) reduction in the population was observed in a relatively short treatment time of 90 s. Industrial relevance The results obtained in this work demonstrated the potential of using atmospheric pressure plasma jet technology as a non-chemical, non-thermal, and thermal stainless steel food contact surface decontamination against Pseudomonas aeruginosa, a common biofilm-producing bacterium. Such a technology shall help the industry address the challenge of cross contamination in the food manufacturing and food service settings. © 2016 Elsevier Ltd

Tumlos R.,University of the Philippines at Manila | Ting J.,University of the Philippines at Diliman | Osorio E.,University of the Philippines at Diliman | Rosario L.,FEATI University | And 4 more authors.
Surface and Coatings Technology | Year: 2011

The study to be presented is motivated by the need of certain industries to implement a cost-effective method of cleaning up wastewater from industrial processes, for example the clean-up of dye-tainted wastewater from textile mills. Biomass by-products, for a long time, have been the popular choice for the role of clean-up agents for certain applications but sometimes the efficiency for adsorption of the targeted waste material is not promising and thus the need for pre-treatment of the biomass material. This work will present the results of a study using three methods of pre-treating coconut (Cocos nucifera) lumber sawdust for the adsorption of methyl red dye in water solution, namely; (1) chemical processing using formaldehyde treatment and sulfuric acid treatment, (2) vacuum drying, and (3) plasma treatment. The vacuum drying and plasma treatment utilized a hexapole-magnetized microwave plasma device that uses a 2.45. GHz microwave source. The results showed that there is a dramatic increase in the dye removal efficiency (% dye removal) after the treatment of the coconut sawdust. The highest recorded % dye removal is as follows: formaldehyde treatment (20%), sulfuric acid treatment (40%), vacuum dried (62%), hydrogen plasma (65%), oxygen plasma (67%) and argon plasma (70%). It was also shown that the % dye removal is dependent on the initial dye concentration, adsorbent dosage, contact time, and pH. The adsorption results of this study were fitted with Freundlich and Langmuir isotherm models but the data are better described by the Freundlich isotherm model as compared to Langmuir. From the results of the study, it is concluded that the methods of vacuum drying and plasma pre-treatment are more effective alternative to chemical processing of the coconut lumber sawdust in the adsorption of dye in wastewater. © 2011 Elsevier B.V.

Ting J.A.S.,University of the Philippines at Diliman | Rosario L.M.D.,University of the Philippines at Diliman | Rosario L.M.D.,FEATI University | Lee H.V.,University of the Philippines at Diliman | And 3 more authors.
Surface and Coatings Technology | Year: 2014

In this study, a hydrophobic coating on glass surfaces was fabricated by application of a silicone oil lubricant and activated using a microwave atmospheric plasma jet. Optimization of the treatment was done by variation of the working gas flow rates, input microwave power and plasma treatment time, based on contact angle measurements. In comparison with the untreated glass (37.6°), results show that at best discharge conditions of 600W microwave power, 5/0.5 LPM Ar/N2 flow rate and 10s treatment time, the plasma-treated glass obtained a water contact angle of 105.7°. Surface energy of the glass also decreased from 45.07mN/m for the untreated to 27.97mN/m after plasma treatment. Atomic force microscopy (AFM) and Fourier transform infrared (FTIR) spectroscopy results suggest that increased root-mean-square roughness and introduction of hydrophobic species may have been responsible for the hydrophobicity of the glass surface. © 2014 Elsevier B.V.

Ting J.A.S.,University of the Philippines at Diliman | Rosario L.M.D.,University of the Philippines at Diliman | Rosario L.M.D.,FEATI University | Lacdan M.C.C.,University of the Philippines at Diliman | And 5 more authors.
International Journal of Adhesion and Adhesives | Year: 2013

Steel surfaces have been modified using low pressure microwave plasma to enhance its adhesion with an epoxy adhesive. Optimization of the wettability of the surface was done using contact angle measurements for varying plasma parameters. Maximum wettability (19.9°) was obtained at 1000 W microwave power with 20 min of treatment time, -50 V sample bias and 1.67% O 2/Ar gas flow rate ratio. Enhanced wettability of the steel surface was attributed to increased surface roughness and oxide deposition. Using atomic force microscopy, surface roughness was observed to increase from 64.4 nm for the untreated surface to 76.7 nm for the O2/Ar plasma treated surface. Deposition of oxides on the steel surface was also confirmed by the energy dispersive x-ray spectroscopy. Moreover, the increase in the total surface energy to 53.2 mN/m for the O2 plasma treated steel surface supported the enhancement of its wettability, and hence, the adhesion with epoxy. Based on tensile test results, the adhesion strength of epoxy-bonded O2/Ar plasma treated surfaces at optimum settings was increased to 3816.0 N, which is significantly higher compared to 3038.3 N for the epoxy-bonded untreated surfaces. © 2012 Elsevier Ltd.

Ting J.A.S.,University of the Philippines at Diliman | Rosario L.M.D.,University of the Philippines at Diliman | Rosario L.M.D.,FEATI University | Lee Jr. H.V.,University of the Philippines at Diliman | And 4 more authors.
Vacuum | Year: 2014

The use of a short coaxial plasma line termed the "plasma bulb" has been investigated for enhancement of the wettability of aluminum (Al) and polymethylmethacrylate (PMMA) surfaces. In comparison with other plasma lines, the plasma bulb uses a single magnetron for microwave generation that could produce plasma for surface treatment. For the treatments of Al and PMMA surfaces, various plasma parameters including gas filling pressure, microwave power and treatment time were investigated for different working gases: argon, oxygen and air. Based from contact angle measurements, the largest increase in the wettability of Al (93.8%) and PMMA (76.2%) samples were obtained using air plasma for 5 min and 10 min treatment time, respectively. AFM and EDX results reveal that increased root-mean-square roughness and possible generation of oxygen-containing groups on the surface are the dominant factors contributing to the enhanced wettability. © 2013 Elsevier Ltd. All rights reserved.

Gabriel A.A.,University of the Philippines at Diliman | Aba R.P.M.,University of the Philippines at Diliman | Tayamora D.J.L.,University of the Philippines at Diliman | Colambo J.C.R.,University of the Philippines at Diliman | And 6 more authors.
Food Control | Year: 2016

This study identified a reference organism for the establishment of microwave atmospheric pressure plasma jet treatment of young coconut liquid endosperm. Three different, predominant spoilage bacteria were isolated from spoiled liquid endosperm and identified through 16S rDNA sequencing, prior to propagation and eventual challenge studies. Basic Local Alignment Search Tool comparisons revealed that the isolated spoilage bacteria were Klebsiella sp., Staphylococcus sp., and Kluyvera sp (%Identity 97.34-97.82%). The isolates were propagated to mid-stationary growth phase (17 h) and thereafter suspended in liquid endosperm. The inactivation rates of the spoilage isolates in liquid endosperm subjected to plasma jet at 450 and 650 W input power settings were determined and compared to those of pathogens Escherichia coli O157:H7, Salmonella enterica, and Listeria monocytogenes. Inactivation rates of all test organisms at 450 W (2.76-5.98 min) were significantly less (p < 0.05) than those at 650 W (1.86-3.11 min). In both power settings, S. enterica exhibited the significantly (p < 0.05) greatest resistance towards plasma treatment, while Staphylococcus sp. exhibited the least. Heat penetration studies in both power settings revealed that the temperature of the liquid endosperm did not significantly increase and did not reach bactericidal ranges (<30 °C) during plasma jet treatment, hence the observed inactivation were attributed to antimicrobial species generated by the plasma. Optical emission spectroscopy revealed that these antimicrobial species included atomic oxygen (777.41 and 844.67 nm) and ultraviolet radiation (200-280 nm). Thus, this study determined S. enterica as an appropriate target organism for the establishment of plasma jet process for coconut liquid endosperm, the inactivation rate of which shall be soon established in higher scale treatment process. © 2016 Elsevier Ltd.

Blanco A.C.,University of the Philippines at Diliman | Nadaoka K.,Tokyo Institute of Technology | Paringit M.C.R.,FEATI University
IAHS-AISH Publication | Year: 2012

Land-cover patterns may serve as significant predictors of sediment discharge. The GSSHA model, a distributed physically-based watershed model, was used for the Todoroki watershed (Ishigaki Island, Okinawa, Japan) to estimate sediment discharge for different land-cover conditions as inferred from Landsat images (1984-2003). Results indicate that over the past 20 years, the changing land cover of the Todoroki watershed, in the direction of increasing sugarcane areas, had enhanced sediment discharge from the watershed. However, landscape patterns exhibited a comparable or even stronger relationship with sediment discharge compared to land-cover percentages. Based on regression analyses, four pattern metrics (number of patches, radius of gyration, splitting, and cohesion) accounted for 99% of the variability of discharged sediment volume (RMSE = 9.6) compared to 89.5% represented by land-cover percentages (RMSE = 31.6). The pattern metrics plus percentages of forest and sugarcane jointly represented almost 100% of the variability (RMSE = 0.0015). Pattern metrics have more predictive capability than land-cover percentages and can improve understanding of watershed sediment discharge process. Copyright © 2012 IAHS Press.

Santos C.I.P.,Nationwide Operation Assessment of Hazards Disaster Management using WebGIS | Santos C.I.P.,FEATI University | Aracan K.A.B.,Nationwide Operation Assessment of Hazards Disaster Management using WebGIS | Andal D.F.H.,Nationwide Operation Assessment of Hazards Disaster Management using WebGIS
ACRS 2015 - 36th Asian Conference on Remote Sensing: Fostering Resilient Growth in Asia, Proceedings | Year: 2015

The Philippines is traversed by an average of 20 tropical cyclones annually. This exposes communities to various hydro-meteorological hazards like strong winds, floods, rain-induced landslides, and storm surges. The delivery of relief services is crucial to ensure that affected communities can recover after these hazards. However, this may be hampered by roads that were damaged or deemed impassable in the said events. This study would map the critical facilities (evacuation centers, hospitals, and government buildings) and the road network. It will employ the use of a population density map generated from delineated built-up areas and the projected population estimates based from previous census results to integrate service area capacity of each critical facility. It would then employ a multi-criteria evaluation approach that considers accessibility, service coverage of critical facilities, and possible debris accumulation (ie. vegetation knocked down by strong winds, rubble from flood and storm surges, landslide deposits). Using network analysis in a Geographic Information System, critical and most efficient routes in transporting relief services will be determined. The identified critical path will be prioritized for clearing operations in times of disasters to ensure the effective facilitation of disaster response efforts. The outputs of the study can be used as a basis in improving disaster preparedness and resource prepositioning planning.

Ganiron T.U.,FEATI University
SEFI Annual Conference 2014 | Year: 2014

This paper presents an overview of the Civil Engineering Project courses at FEATI University, a core requirement in the undergraduate curriculum of Civil Engineering Department since 2006. These courses were established as part of implementation of the School's 2008 strategic plan that sought to address new challenges in a rapidly changing professional, educational and institutional environment. The paper discusses the motivation for the course, course information, the course content, continuing concepts and paradigms, mechanisms utilized for instructional delivery and didactic resources, and lessons learned after five years of course implementation, and on-going development of the course. The strategy of team teaching, where the three faculty members work cooperatively with the same group of students will be adopted in selected topics. The effort in enriching the learning experience of students in Civil Engineering Project is an answer to the demands of present time for civil engineering graduates who are innovative, creative and concerned. Their role as future civil engineers requires knowledge and concepts in the multidisciplinary field of innovation and research to enable them to become more successful in their field of specialization.

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