You are invited to attend the IMSP SP & Thesis Conference on October 18, 2012 (Thursday) at the Math Building (Physics: Room MB 114). Please relay this invitation to thesis students.

Schedule of the BS Applied Physics Thesis Defense:

Jocelyn P. Fortaleza
Title: Root system architecture and growth dynamics of two rice (Oryza sativa L.) genotypes
Panel Members: L.S.M. Lozada (Adviser); E.A. Florido; E.B. Vergado; A.B. Santos

Root system architecture (RSA) plays a vital role in a plant's growth and sur-vival. Knowing the root system architecture gives us phenotyping capabilities and good grasp of root growth. In this work, roots of two rice (Oryza sativaL.) geno-types (Vandana and Way rarem), which di ers mainly on their ability to withstand drought, were considered. These were grown on a transparent growth system and ex-amined using a non-destructive imaging system. Root systems of the said genotypes were phenotyped for eight days and the following root features were computed: net-work depth, network area, network convex area, network surface area, and network length. Results showed that the root system architecture varies between genotypes. Both Vandana and Way rarem root systems are found to slow down their growth once it attained a certain length or age. Phenotyping done for both genotypes suggested that no signicant difference exists between the varieties.

Neil Anthony L. Collada
Title: Microcontroller Unit Based Vehicle Security System with SMS-based Monitoring and Controlling
Panel Members: E.A. Florido (Adviser); N.C. Altoveros;  J.G. Bugna; H.R.E. Forio

An automated monitoring and controlling anti vehicle-jacking system was design and implemented in L300 Mitsubishi van. The system consists of GSM modem, PIC16F877 microcontroller, relay, and other electronic devices. The GSM modem was tested using AT commands in hyperterminal to evaluate commands that were going to use in the system. The PIC microcontroller was programmed and burned its code in MPLAB IDE and PICkit 2 respectively.

The reliability of the system to accurately sense intrusion and notification were also determined and the system was successful in the tests done. The reliability was also determined by means of its latency, the lower the latency of the system the better. Two testing parameters were considered, the temperature and the received signal strength (RSS). The study used Factorial ANOVA in the experiments to consider together the effects of temperature and RSS on the latency of the system. The temperature shows a significant effect on the latency while RSS didn’t shows significant difference. The temperature with the lowest mean value of 9.66375s for latency is 45°C while the temperature with the highest mean value of 10.13406s for latency is 10°C. The difference between the highest mean value and the lowest mean value is approximately 0.5s, in real time security purposes this value might not that significant.

Ramelo Mari Stephen C. Ramirez III
Title: Fabrication and Characterization of Zinc Oxide (Zno) Nanoparticles by Thermal Spraying
Panel Members: E.A. Florido (Adviser); L.S.M. Lozada; A.M. Ulano; K.M. Calamba

This study aimed to test the feasibility of using thermal spraying to produce Zinc Oxide (ZnO) nanoparticles. Nanoparticles with diameters ranging from 110 nm to 140 nm were successfully fabricated by means of thermal spraying making use of zinc acetate (ZnAc) as coating material. Three trials were performed which produced nine samples four of which were subjected to scanning electron microscopy. The images were compared with those produced by other methods, such as, precipitation method and plasma spray. Results show that similar structures were formed which include the clustering pattern of the particles and the occurrence of elongated particles. It is therefore possible to use thermal spraying for fabricating ZnO nanoparticles. It is recommended that the set-up be improved to include control of material feed-rate, flame intensity, distance between source and substrate, and other parameters in order to properly quantify the results.

Ma. Daniella Helena D. Nieva
Title: Video analysis of the collective behavior of superworms Zophobas morio
Panel: L.S.M. Lozada (Adviser); A.V.Gillado (Co-adviser); C.M.N. Pinol; J.G. Bugna; H.R.E. Forio

In this study, we investigated the emergence of collective behavior of segmented worms Zophobas morio.  Different population of worms inside a circular container were examined using video analysis.  The movement of worms were limited on a two-dimensional plane to prevent them from moving on top each other.  In the first part of the study, each of the 11 segments of a worm were tracked every 1-second interval for 600 seconds.  It was observed that segmentation allows the worm to coil, turn, and move along a line. Segments 1 (head) to 3 were used by the worm to determine where to go while segments 4 to 11 (tail) provides the displacement of the body following a linear translation, except for turns and coiling.  From this, we define a translational axis using the average positions of segments 4 to 11 and found that angular displacements of segments 1, 2, and 3 measured from this axis vary from each other.  As one goes from head to tail, the movement of a segment becomes linear (translational).  In the second part of the study, we studied N = 5, 10, 20, and 30 worms.  However, only segment 4 of each worm was tracked for 600 seconds since this provides the average position of an individual worm.  The time evolution of average speed, position from the center of the container, trajectory, and velocity order parameter were examined.  And we found that increasing the number of worms decreases their average speed.  With more worms in the system, each worm finds it hard to move forward or to its side.  This resulted to slower movement and less fluctuation in the average speed.  The average position in a system with N = 20 and 30 worms were both at 0.55 (0=center to 1=wall), while in N = 5 and 10 positions range from 0.67 to 1 and 0.66 to 0.73 since there are more empty space to cover.  It was observed that increasing the number of worms limited them to move along one direction.  Colliding worms align with each other.  The wall also limited their motion along it.  With larger population, crowded worms assume an average speed except for those without neighbor or at the interface of the crowd and empty space.  From these, we showed that increasing the population of worms in a confined space limited their motion and approached a much slower average speed moving as one or in packets with common group speed.

Last Updated on Wednesday, 17 October 2012 09:00

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