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Articles 1 - 4 of 4
Full-Text Articles in Physical Sciences and Mathematics
Application Of Image Processing Programs In Color Analysis Of Wood Photodegradation, Gabriel Joseph D. Plata, Ramon M. Delos Santos
Application Of Image Processing Programs In Color Analysis Of Wood Photodegradation, Gabriel Joseph D. Plata, Ramon M. Delos Santos
Physics Faculty Publications
In general, polymer photodegradation is an important aspect of polymer science that is of great interest to chemistry, materials science, biology, and physics students who engage in this field of research. Wood consists of three main polymers, which makes it a good candidate for such photodegradation studies. Aside from structural changes based on chemical analysis, color change assessment can also be employed to check any extent of degradation on wood without the need for sophisticated analytical equipment. This study presents the application of two image processing programs in color analysis of wood photodegradation: ImageJ and Colormath library, which are Java-based …
Sources And Characteristics Of Size-Resolved Particulate Organic Acids And Methanesulfonate In A Coastal Megacity: Manila, Philippines, Connor Stahl, Melliza Templonuevo Cruz, Paola Angela Bañaga, Grace Betito, Rachel A. Braun, Mojtaba Azadi Aghdam, Maria Obiminda L. Cambaliza, Genevieve Rose Lorenzo, Alexander B. Macdonald, Miguel Ricardo A. Hilario, Preciosa Corazon Pabroa, John Robin Yee, James Bernard Simpas, Armin Sorooshian
Sources And Characteristics Of Size-Resolved Particulate Organic Acids And Methanesulfonate In A Coastal Megacity: Manila, Philippines, Connor Stahl, Melliza Templonuevo Cruz, Paola Angela Bañaga, Grace Betito, Rachel A. Braun, Mojtaba Azadi Aghdam, Maria Obiminda L. Cambaliza, Genevieve Rose Lorenzo, Alexander B. Macdonald, Miguel Ricardo A. Hilario, Preciosa Corazon Pabroa, John Robin Yee, James Bernard Simpas, Armin Sorooshian
Physics Faculty Publications
A 16-month (July 2018–October 2019) dataset of size-resolved aerosol composition is used to examine the sources and characteristics of five organic acids (oxalate, succinate, adipate, maleate, phthalate) and methanesulfonate (MSA) in Metro Manila, Philippines. As one of the most polluted megacities globally, Metro Manila offers a view of how diverse sources and meteorology impact the relative amounts and size distributions of these species. A total of 66 sample sets were collected with a Micro-Orifice Uniform Deposit Impactor (MOUDI), of which 54 sets were analyzed for composition. Organic acids and MSA surprisingly were less abundant than in other global regions that …
Long-Range Aerosol Transport And Impacts On Size-Resolved Aerosol Composition In Metro Manila, Philippines, Rachel A. Braun, Mojtaba Azadi Aghdam, Paola Angela Bañaga, Grace Betito, Maria Obiminda L. Cambaliza, Melliza Templonuevo Cruz, Genevieve Rose Lorenzo, Alexander B. Macdonald, James Bernard Simpas, Connor Stahl, Armin Sorooshian
Long-Range Aerosol Transport And Impacts On Size-Resolved Aerosol Composition In Metro Manila, Philippines, Rachel A. Braun, Mojtaba Azadi Aghdam, Paola Angela Bañaga, Grace Betito, Maria Obiminda L. Cambaliza, Melliza Templonuevo Cruz, Genevieve Rose Lorenzo, Alexander B. Macdonald, James Bernard Simpas, Connor Stahl, Armin Sorooshian
Physics Faculty Publications
This study analyzes long-range transport of aerosol and aerosol chemical characteristics based on instances of high- and low-aerosol-loading events determined via ground-based size-resolved aerosol measurements collected at the Manila Observatory in Metro Manila, Philippines, from July to October 2018. Multiple data sources, including models, remote sensing, and in situ measurements, are used to analyze the impacts of long-range aerosol transport on Metro Manila and the conditions at the local and synoptic scales facilitating this transport. Through the use of case studies, evidence of long-range transport of biomass burning aerosol and continental emissions is identified in Metro Manila. Long-range transport of …
Dynamics Of Optically-Generated Carriers In Si (100) And Si (111) Substrate-Grown Gaas/Algaas Core-Shell Nanowires, Ramon M. Delos Santos, Jasher John Ibañes, Maria Herminia Balgos, Rafael Jaculbia, Jessica Pauline Afalla, Michelle Bailon-Somintac, Elmer Estacio, Arnel Salvador, Armando Somintac, Christopher Que, Satoshi Tsuzuki, Kohji Yamamoto, Masahiko Tani
Dynamics Of Optically-Generated Carriers In Si (100) And Si (111) Substrate-Grown Gaas/Algaas Core-Shell Nanowires, Ramon M. Delos Santos, Jasher John Ibañes, Maria Herminia Balgos, Rafael Jaculbia, Jessica Pauline Afalla, Michelle Bailon-Somintac, Elmer Estacio, Arnel Salvador, Armando Somintac, Christopher Que, Satoshi Tsuzuki, Kohji Yamamoto, Masahiko Tani
Physics Faculty Publications
GaAs/Al0.1Ga0.9As core-shell nanowires (CSNWs), with average lateral size of 125 nm, were grown on gold nanoparticle-activated Si (100) and Si (111) substrates via molecular beam epitaxy. Room temperature-photoluminescence (RT-PL) from the samples showed bulk-like GaAs and Al0.1Ga0.9As bandgap emission peaks at 1.43 and 1.56 eV, respectively. Higher PL emission intensity of the sample on Si (111) compared to that on Si (100) is attributed to uniform Al0.1Ga0.9As shell passivation of surface states on Si (111)-grown CSNWs. Carrier dynamics in two different temporal regimes were studied. In the sub-nanosecond time scale (300–500 ps), time-resolved radiative recombination efficiency of carriers was examined. …