Philippine Engineering Journal

Includes bibliographical references.

Article 1. Modeling of sample withdrawal effects on Pseudo-order batch sorption kinetics -- Article 2. Design of residence hall for electricity conservation -- Article 3. Development of building-specific approach to city seismic response analysis for metro manila -- Article 4. Laboratory analysis on the mechanical properties of Spiny Bamboo layers -- Article 5. Accelerated hydrothermal degradation and biodegradation of electrospun polycaprolactone montmorillonite nanofiber membrane -- Article 6. A validation study on the performance of a horizontal axis tidal turbine.

[Article Title: Modeling of Sample Withdrawal Effects on Pseudo-Order Batch Sorption Kinetics / Jay R T. Adolacion and Maria Lourdes P. Dalida, p. 1-20] Abstract: Apparent sorption kinetics determined from single-run batch studies can drift significantly from true kinetics in systems where sorbent quantity remains constant with respect to sample withdrawal. This systematic error is investigated for sorption reaction models, generalized to any reaction order. The problem is formulated to quantify the bias associated with the number and volume of samples withdrawn under relatively slow equilibrium. The results are extended to rapidly equilibrating systems following the Langmuir isotherm model.;[Article Title: Design of Residence Hall for Electricity Conservation / Juvy Balbarona, Ferdinand Manegdeg, and Shirley Guevarra, p.21-40] Abstract: The reduction of electricity consumption of residence halls in a university without compromising the level of comfortability and nurturing environment and or increasing the level of comfortability and nurturing environment at optimal electricity consumption are the goals of efficient and sustainable university residence hall administration. This paper presents the results of the study for all the residence halls in the University of the Philippines Diliman campus.;[Article Title: Development of building-specific approach to city seismic response analysis for Metro Manila / Pher Errol Balde Quinay, and Rhommel Grutas, p. 41-50] Abstract: Information on the expected variability of maximum responses of buildings in cities of Metro Manila in the event of a strong earthquake can aid in disaster preparedness. A way to obtain such information is to combine the responses of individual buildings as influenced by different material properties and input ground motion. This study aims to develop a building-specific approach to city seismic response analysis for Metro Manila. Tools were developed for the tasks of processing feature data from GIS datasets, generation of building-specific input ground motion, automated MDOF model generation and analysis, and postprocessing of results.;[Article Title: Laboratory Analysis on the Mechanical Properties of Spiny (Kawayan Tinik) Bamboo Layers / M. Ramos and M. Candelaria, p. 51-66] Abstract: Bamboo has been introduced as a possible alternative to some construction materials nowadays. Its potential use in the field of engineering, however, is still not widely practiced due to insufficient engineering knowledge on the material's properties and characteristics. Although there are researches and studies proving its advantages, it is still not enough to say that bamboo can sustain and provide the strength and capacity required of common structures. In line with this, a more detailed analysis was made to observe the layered structure of the bamboo, particularly the species of Kawayan Tinik. It is the main intent of this research to provide the necessary experiments to determine the tensile strength of dried bamboo samples.;[Article Title: Accelerated Hydrothermal Degradation and Biodegradation of Electrospun Polycaprolactone Montmorillonite Nanofiber Membrane / Michael Leo Dela Cruz, Kristal Aubrey Bornillo, John Jaymar Ri├▒a, and Leslie Joy Diaz, p. 67-78] Abstract: The nanocomposite of montmorillonite (MMT) clay and polycaprolactone (PCL) have been reported to successfully serve as a reusable adsorbent of heavy metal from wastewater from metal extraction. In this study, the degradability of the electrospun polycaprolactone (PCL) nanofiber membrane, as support material to MMT, was evaluated through accelerated hydrothermal degradation and biodegradation as a continuous effort to be able to appropriately discard the spent adsorbent materials. In the hydrothermal conditions, the membranes were immersed in NaOH solution and H2O at 35 oC and 45 oC at specific durations. While for the biodegradation, alkali-treated and untreated membranes were buried in two separate media, i.e. soil and compost, to evaluate the natural decomposition.;[Article Title: A Validation Study on the Performance of a Horizontal Axis Tidal Turbine (HATT) / Binoe Abuan, p. 79-93] Abstract: A Computational Fluid Dynamics (CFD) model of the Sheffield HATT, a tidal turbine designed to perform better in varying flow velocity, was created in order to predict its performance in unsteady flow using ANSYS FLUENT. Several mesh independence tests were performed to determine a suitable mesh for the problem under study. The final CFD model was used to do simulation of a full tip-speed ratio (TSR) sweep to determine the performance curve of the turbine.