Ateneo Physics Department and Manila Observatory participate in the 28th Samahang Pisika ng Pilipinas Physics Congress last 25-27 Oct 2010 at Antipolo City

Last 25-27 October 2010, the Physics Department of Ateneo de Manila University participated in the 28th Samahang Pisika ng Pilipinas (SPP) Physics Congress at MMLDC, Antipolo City.   The Ateneo physics faculty who are members of the 2010 National Council are Dr. Raphael Guerrero (1st Vice President), Dr. Gemma Theresa Narisma (Treasurer), and Dr. Nofel Lagrosas (Senior Councilor).    Dr. Narisma was elected to another term as Treasurer while Dr. Guerrero progresses to President starting January 2011.  Dr. Lagrosas’s term as Senior councilor ends on 31 December 2010.

Below are the abstracts of conference papers and posters presented by faculty and students of the Physics Department and of the Manila Observatory (SPP Book of Abstracts is here):

SPP-2010-028: Comparison of satellite derived aerosol optical depth with AERONET data from the Manila Observatory

A.Siongco1, I.Amago1, R.Teope1, N.Lagrosas1,2, B.Holben3

1Dept of Physics, Ateneo de Manila University2 Manila Observatory 3
NASA Goddard Space Flight Center
The Moderate Resolution Imaging Spectroradiometer (MODIS) and
Multiangle Imaging Spectroradiometer (MISR) are instruments onboard the satellite Terra which provide aerosol optical depth (AOD) measurements over a wide spatial coverage. The Aerosol Robotic Network (AERONET) is a network of ground-based sun photometers which measure AOD several times a day. In this paper, satellite retrievals of AOD for January 2009 to May 2010 were validated through the AERONET site at the Manila Observatory. Correlation of MODIS and AERONET yielded an R2 = 0.77 while MISR and AERONET had an R2 = 0.88. Excluded data sets were attributed to cloud contamination. Improvements in the cloud-screening algorithms of the satellite retrievals are recommended.

SPP-2010-035: Analysis of Particulate Matter (PM2.5 and PM10) measurements from the Manila Observatory and Aerosol Optical Depth Derived from the Multiangle Imaging Spectroradiometer (MISR)

I.Amago1, N.Lagrosas1, 2

1Dept of Physics, Ateneo de Manila University 2Manila Observatory

This paper seeks to correlate MISR aerosol optical depth retrievals and ground measured particulate matter (PM2.5 and PM10) concentrations in Manila Observatory for the years 2004 and 2005. Both PM2.5 (R2=0.7464) and PM10 (R2=0.6784) showed a good correlation between the two parameters. Using binning analysis, the correlative strength of the two variables was attested and emphasized with PM2.5 having an R2 of 0.9779 and PM10 with an R2 of 0.9458.

SPP-2010-060: Effects of Urban Aerosol Variations on the Angstrom coefficient and relative humidity above the Ateneo de Manila University and surrounding areas.

J. Angan1, N.Lagrosas1,2, B.Holben3

1Dept of Physics, Ateneo de Manila University,
2Manila Observatory,
3NASA GSFC

The Angstrom coefficient is the measure of the dominance of fine
particles in the atmosphere. Soot and sulfate are dominant aerosol
types in the vicinity of the Manila Observatory. This study aims to infer the area’s soot to sulfate concentration ratio based on the Angstrom coefficient and relative humidity measurements made at the Manila Observatory using its Aerosol Robotic NETwork (AERONET) sun photometer and the modeling program Optical Properties of Aerosols and Clouds (OPAC). The results show that Manila Observatory has a high soot to sulfate concentration ratio, typical of an urban setting.

SPP-2010-140: Observations of aerosol optical depth and formation of fog during 2006 and 2010 New Year celebrations

R.Chu1, N.Lagrosas1,2

1Dept of Physics, Ateneo de Manila University
2Manila Observatory

Spectrometric observations during the 2006 and 2010 New Year
celebration are reported. During these foggy events, AOD values have been measured at 550nm. The observations showed that the two New Year data displayed two different temporal locations of the AOD peaks. Based on the relative humidity measurements and dew point temperature, the fog formation can be attributed to high aerosol loading in the atmosphere and low ambient and dew point temperature difference.

SPP-2010-173: Discharge Characteristics of a Direct Current Glow Discharge Confined in a Plexiglas Collimator

M.Aguila1, P.Ramos1,2, I.Culaba1

1Dept of Physics, Ateneo de Manila University
2CDCAS, Isabela State University

The discharge characteristics of a DC glow discharge with Plexiglas
tube as discharge collimator were investigated by evaluating the glow discharge shapes, current-voltage plots, current-pressure plots, and Paschen curve at different pressure regimes and applied voltages. Results show that the glow discharge shape, luminosity, and current vary at different pressure regimes and magnitude of applied potential differences. Characterization of the discharge behavior under the influence of a collimator at different pressures and voltages becomes increasingly important for future works on the plasma treatment of polymer surfaces.

SPP-2010-064: Transmission Properties of Thermally Oxidized Copper Oxide Thin Films

A.Lusuan, I.Culaba

Dept of Physics, Ateneo de Manila University

Copper oxide films were fabricated by thermal oxidation of thermally evaporated copper films. Film thicknesses vary basing on the transmission spectra of the samples. Results of the study show that the sample oxidized at 180°C have a spectral region of 610nm – 615nm with transmission peak around 15%. Samples oxidized at 300°C have a spectral region of sample 495nm – 500nm with transmission peak 20-25%.

SPP-2010-131: Fluidic actuation of a variable-focus elastomeric lens

J.Indias1, J.Barretto1, C.Go2, R.Guerrero1

1Dept of Physics, Ateneo de Manila University 2Dept of Mathematics, Ateneo de Manila University

A tunable fluidic lens of variable radius and focal length based on the design by R. Marks is fabricated and characterized. Using a collimated HeNe beam (λ = 543.5nm), changes in focal lengths are observed and visualized as gradual volumetric increments are introduced into the lens. Furthermore, resulting focal length plots against volume changes are compared against theoretical values while surface plots of beam profile are obtained.

Active learning in optics and photonics: outcomes and achievements to date

M.Alarcon1, E.Arthurs2, Z.Lakhdar3, I.Culaba4, V.Lakshminarayanan5,
J.Maquiling4, A.Mazzolini6, J.Niemela7, D.Sokoloff8

1Division of Basic and Engineering Sciences, UNESCO 2 SPIE-The International Society for Optical Engineering 3 University El Manar
4 Department of Physics, Ateneo de Manila University 5 University of Waterloo 6 Swinburne University of Technology 7 Abdus Salam International Center for Theoretical Physics (ICTP) 8 University of Oregon, Eugene, Oregon, USA Recipient, 2010 SPIE President’s Award for Optics Education Aimed at enabling physics teachers in developing countries to teach optics more effectively, the UNESCO project on Active Learning in Optics and Photonics (ALOP), now in its seventh year, has developed a trainers’ training curriculum and manual. Workshops have been held in Ghana, Tunisia, Morocco, Zambia, Cameroon, Nepal, India, Pakistan, Brazil, Mexico, Argentina, Colombia and Peru. Participants from about 30 countries have participated in the learning process using
laboratory and hands-on activities. Regional follow-up activities have commenced, including translation of the manual into French and holding locally-organized workshops in French in Tunisia and Morocco. The French edition of the training manual has been completed and plans are underway for a Spanish translation. In 2010, ALOP was awarded the SPIE – The International Society for Optical Engineering President’s Award for Outstanding Contribution in Optics Education. This paper will discuss the ALOP project and its outcomes to date.

SPP-2010-083: Comparison of Monthly Rain Gauge Measurements in Selected Luzon Stations with Monthly TRMM 3B43 Version 6 Precipitation Measurements

C.Salinas1, N.Lagrosas1,2, J. Simpas1,2, G.Lorenzo1

1 Manila Observatory
2 Dept of Physics, Ateneo de Manila University

This paper aims to report the correlation of the monthly rainfall rate measurements from the TRMM 3B43 Version 6 data set and the monthly rainfall rate measurements from rain gauges in the National Capital Region, Camarines Sur and Zambales. Also, this paper aims to determine the temporal behaviour of the monthly rainfall rate over the years 2008 and 2009 as measured by the TRMM 3B43 Version 6 dataset and the selected rain gauges. For the weather station in NCR, the Manila Observatory, the correlation coefficient is 0.73. For the weather station in Camarines Sur, the correlation coefficient is 0.33. For the weather station in Zambales, the correlation coefficient is 0.912. Both Manila Observatory and the station from Zambales exhibited a peak in precipitation on September 2009 and also exhibited an increase in precipitation from August till December.

SPP-2010-096: Perturbation methods for misaligned optical elements

J.Barretto1, C.Go2 1

Dept of Physics, Ateneo de Manila University 2 Dept of Mathematics, Ateneo de Manila University

Misaligned optical components are considered as perturbations of the aligned component using two complimentary methods. The first
method uses Ray Transfer Matrices and scalar metrics to quantify the extent of the misalignment. The perturbed light path due to the misaligned component constitute the second method. An expansion of the light path to second order is provided. Similarities between the two methods are discussed.

SPP-2010-122: Holographic generation of periodic wave fields

A.Asuncion, R.Guerrero

Dept of Physics, Ateneo de Manila University

Longitudinally interfering Bessel beams have been demonstrated to
exhibit a self-imaging effect which offers more flexibility in optical
micromanipulation than ordinary Bessel beams. These superimposed
Bessel beams or SBB can be made available using a modified version of Durnin’s lens-annulus method. In this paper SBBs are stored in a photorefractive crystal at λ1 = 543.5nm and reconstructed at λ1 and λ2 = 633nm. Retrieved beams at λ1 were found to exhibit the same periodicity as the original beam while λ2 reconstructions were found to have a modified period. Results show the potential of volume holographic methods for SBB generation as well as a promising new technique for modulating the SBB periodicity through the dual wavelength method.

SPP-2010-151: Oblique angle deposition of high transmitting
MgF2 multilayer films

P.Ramos1,2, A.Ang1, I.Culaba1

1Dept of Physics, Ateneo de Manila University
2CDCAS,Isabela State University

Magnesium fluoride was deposited on glass substrates using Oblique Angle Deposition (OAD) by resistive heating. Samples were prepared by a combination of OAD and normal incidence deposition, and one sample was prepared using normal incidence deposition. Electron microscopy of the samples revealed a columnar grain structure, while EDX analysis showed unbalanced stoichiometry for samples prepared without a pore closure layer (outer-layer with deposition angle of 0°).  The transmission spectra of the samples were also obtained and it was found that by changing the deposition angle of the film, the transmission properties of the samples can be manipulated.

SPP-2010-152: Sustained Hydrophilicity of Plasma-Treated PDMS Surfaces by Water Immersion

M.Aguila1, I.Culaba1, E.Enriquez2

1Dept of Physics, Ateneo de Manila University 2Dept of Chemistry, Ateneo de Manila University

We demonstrate surface treatment of PDMS by direct current (dc)
magnetron Argon plasma to examine the effects of plasma exposure and water immersion on the surface properties of PDMS. Results of contact angle measurements and FTIR-ATR spectroscopy show that plasma treatment led to significant hydrophilicity on the PDMS surface. Water-immersed plasma treated samples were found to sustain a more hydrophilic surface compared to air-stored samples despite having longer aging time. The study proved water to be an effective hydrophobic recovery retardant for plasma-treated PDMS surfaces.

SPP-2010-009: Liquid-air Interface Deformation Adaptive Lens

J.Barretto, R.Guerrero

Dept of Physics, Ateneo de Manila University

A variable focus liquid lens based on refractive imaging is presented. Deformation of the liquid interface by liquid redistribution introduces menisci in the proximity of the aperture of a reservoir. By controlled variation of the liquid volume, convex and concave lens profiles were produced. Magnification and imaging properties are presented.

SPP-2010-157: Generalized Huygens-Fresnel integral for a single small aberration

J.Barretto1, S.Baluyot1,2 1

Dept of Physics, Ateneo de Manila University 2
Dept .of Mathematics, Ateneo de Manila University

The generalized Huygens-Fresnel (GHF) integral is modified to take
into account the effects of a single small arbitrary aberration. This is accomplished by considering the ray transfer matrix (RTM) of an optical element with aberrations as a perturbation of the RTM in the absence of aberrations. The elements of the perturbed RTM is then used to write the kernel of the GHF integral. Effects of the aberration on a gaussian beam are discussed using the complex beam parameter in the presence of aberrations.

SPP-2010-158: Copper Thin Films on Plasma-treated Glass Substrates

P.Ramos1,2,A.Ang1, I.Culaba1

1Dept of Physics, Ateneo de Manila University
2CDCAS, Isabela State University

A vacuum coating system for thermal evaporation was reconfigured to include a DC glow discharge system for plasma bombardment of substrates before the deposition process. Cu films were deposited onto glass substrates using this modified coating system. The glass substrates where exposed to argon plasma discharge for ten minutes before copper metallization, without breaking the vacuum. It was observed that less surface imperfections and higher adhesion were manifested by the Cu films on plasma-treated glass substrates as compared to glass substrates which did not undergo plasma treatment. Higher percent transmission was achieved for thermally evaporated Cu film of 16.32% compared to PAD samples.

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3 Responses to Ateneo Physics Department and Manila Observatory participate in the 28th Samahang Pisika ng Pilipinas Physics Congress last 25-27 Oct 2010 at Antipolo City

  1. EOA says:

    Correction: Dr.Guerrerro, Narisma, and Lagrosas are members of the SPP National Council in 2010.
    Dr. Narisma was elected to another term as Treasurer while Dr. Guerrero progresses to President starting January 2011. Dr. Lagrosas’s term as Senior councilor ends on 31 December 2010.

  2. Artoni Ang says:

    You missed SPP-2010-151 and SPP-2010-158…

  3. Sorry for my oversight. Thanks for pointing it out.

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