IPA Recipients for January 2017

Kate Tungpalan
Department of Mining, Metallurgical and Materials Engineering
College of Engineering
UP Diliman

The Influence of Veins on Mineral Liberation as Described by Random Masking Simulation. Minerals Engineering, 100: 109–114, January 2017.

Catchy title of research: Influence of veins on mineral liberation described by random masking simulation

The research describes the role of vein structures to better understand and interpret the origin of mineral liberation based on random masking simulation. Semicircular slabs from a copper porphyry deposit were selected and analysed in the MLA.  Classified MLA images were then subjected to image processing to identify and separate the veins from the disseminated grains. Random masking was applied on the images to simulate breakage and determine liberation of sulphides. The results provided an indication of the contribution of veins in the liberation of minerals at coarser size and the increased degree of liberation. The work also suggests cutting drill cores and using slabs for texture analysis provides more intact textural features of the ore both at micro and mesoscale thus providing a better understanding of the origin of mineral liberation.

Link to the article: http://www.sciencedirect.com/science/article/pii/S0892687516303612
Impact Factor: (2015/2016) 1.813

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Manuel Joseph C. Loquias
Institute of Mathematics
College of Science
UP Diliman

Rational Digit Systems Over Finite Fields and Christol’s Theorem. Journal of Number Theory, 171: 358–390, February 2017.

Catchy title of research: A Numeration System whose Base is a Quotient of Polynomials

In this article, a numeration system whose base is a rational function is developed for polynomials and for formal Laurent series over finite fields.  Uniqueness and automatic properties of expansions in this numeration system are investigated.

Link to the article: http://www.sciencedirect.com/science/article/pii/S0022314X16302049
Impact Factor: (2015/2016) 0.596

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Renier Mendoza
Institute of Mathematics
College of Science
UP Diliman

A Two-Phase Segmentation Approach to the Impedance Tomography Problem. Inverse Problems, 33 (1): 015001, 24 pages, January 2017.

Catchy title of research: An Image Segmentation Approach to the Electrical Impedance Tomography Problem

Electrical Impedance Tomography (EIT) is a cheaper alternative imaging technique, similar to CT-scan or MRI, that uses the electrical potential and conductivity of a given body. Because of the difficulty of the problem, several approaches in solving EIT can be found in the literature. In this paper, the use of a multi-phase segmentation technique was studied in solving the EIT problem. The numerical simulations done show promising results.

Link to the article: http://iopscience.iop.org/article/10.1088/0266-5611/33/1/015001/meta
Impact Factor: (2015/2016) 1.651

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Fernando dlC. Paragas
Department of Communication Research
College of Mass Communication
UP Diliman

Determinants of Mobile Consumers’ Perceived Value of Location-Based Advertising and User Responses. International Journal of Mobile Communications, 14 (2): 99-117, 2016.

Catchy title of research: Consumer Motivation and Responses to Location-Based Advertising

Little is known about the relationship between consumers and location-based advertising, the new and potentially high-profit frontier for the advertising industry. This study shows that privacy concerns have a stronger negative effect on perceived LBA value than perceived sacrifice, while perceived utility, utilization of contextual information and trust positively predict perceived LBA value. Moreover, perceived LBA value increases consumers’ responses to purchase advertised brands, followed by searching for brand information and passing LBA to others.
Data for this study were collected from a nationally representative web survey of 605 respondents who fit the demographic quotas of mobile consumers in Singapore. A parallel study in the Philippines can be conducted to examine cross-cultural differences in the relationship between consumers and LBAs. 

Link to the article: http://www.inderscienceonline.com/doi/abs/10.1504/IJMC.2016.075019
Impact Factor: (2015/2016) 0.765

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Fernando dlC. Paragas
Department of Communication Research
College of Mass Communication
UP Diliman

Organizing and Reframing Technological Determinism. New Media & Society, 18 (8): 1528-1546, December 2016.

Catchy title of research: What is our relationship with technology?

New devices are the reason for supposedly shortening attention span of young people nowadays – a commonplace argument nowadays technological determinism (TD). However popular such arguments are, it remains that TD has been critiqued as reductionist, a historical, and simplistic.
This paper shows, however, that TD is complex and can be located across four typologies according to the axes of objective/subjective dimension and regulation/radical change sociologies, the axes of Burrell and Morgan’s Four paradigms for the analysis of social theory.
Through a survey of literature and theoretical arguments about new media and their possible consequences on political, economic, and cultural systems, the article shows how TD and social determinism constitute a continuum, rather than a dichotomy, of theories about the relationship of technology and society. It recommends the revisiting of Burrell and Morgan’s concepts and their utility in organizing other communicating theories. 

Link to the article: http://journals.sagepub.com/doi/abs/10.1177/1461444814562156
Impact Factor: (2015/2016) 3.110

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Carl Abelardo T. Antonio and Emerito Jose A. Faraon
Department of Health Policy and Administration
College of Public Health
UP Manila

GBD 2015 Maternal Mortality Collaborators. Global, Regional, and National Levels of Maternal Mortality, 1990–2015: A Systematic Analysis for the Global Burden of Disease Study 2015. Lancet, 388 (10053): 1775–1812, 8 October 2016. 

Catchy title of research: GBD 2015_Child Mortality

Figure 1. Under-5 mortality rates by GBD subnational Level 1 geography, both sexes combined, 2015 For each category shown in the legend, the range is inclusive of the minimum value and goes up to, but does not include, the maximum value. GBD=Global Burden of Disease. ATG=Antigua. VCT=Saint Vincent and the Grenadines. LCA=Saint Lucia. TTO=Trinidad and Tobago. TLS=Timor-Leste. Isl=islands. FSM=Federated States of Micronesia. WSM=Samoa.

Figure 1.
Under-5 mortality rates by GBD subnational Level 1 geography, both sexes combined, 2015
For each category shown in the legend, the range is inclusive of the minimum value and goes up to, but does not include, the maximum value. GBD=Global Burden of Disease. ATG=Antigua. VCT=Saint Vincent and the Grenadines. LCA=Saint Lucia. TTO=Trinidad and Tobago. TLS=Timor-Leste. Isl=islands. FSM=Federated States of Micronesia. WSM=Samoa.

Gains in child survival have been large, widespread, and in many places in the world, faster than what was anticipated based on improving levels of development. Yet some countries, particularly in sub-Saharan Africa, still had high rates of under-5 mortality in 2015. Unless these countries are able to accelerate reductions in child deaths at an extraordinary pace, their achievement of proposed SDG targets is unlikely. Improving the evidence base on drivers that might hasten the pace of progress for child survival, ranging from cost-effective intervention packages to innovative financing mechanisms, is vital to charting the pathways for ultimately ending preventable child deaths by 2030.

Link to the article: http://thelancet.com/journals/lancet/article/PIIS0140-6736(16)31575-6/fulltext
Impact Factor: (2015/2016) 44.002

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Carl Abelardo T. Antonio and Emerito Jose A. Faraon
Department of Health Policy and Administration
College of Public Health
UP Manila

Global, Regional, National, and Selected Subnational Levels of Stillbirths, Neonatal, Infant, and Under-5 Mortality, 1980–2015: A Systematic Analysis for the Global Burden of Disease Study 2015. Lancet, 388 (10053): 1725–1774, 8 October 2016.

Link to the article: http://thelancet.com/journals/lancet/article/PIIS0140-6736(16)31575-6/fulltext
Impact Factor: (2015/2016) 44.002

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Desiree M. Hautea, Lourdes D. Taylo, Anna Pauleen L. Masanga and Maria Luz J. Sison
Crop Science Cluster
College of Agriculture
UP Los Baños

Field Performance of Bt eggplants (Solanum melongena L.) in the Philippines: Cry1Ac Expression and Control of the Eggplant Fruit and Shootborer (Leucinodes orbonalis Guenée). PLoS ONE, 11 (6): e0157498, 22 pages, June 2016.

Catchy title of research: Philippine Bt eggplants (Solanum melongena L.) in the field: Cry1Ac protein expression and control of the eggplant fruit and shoot borer (Leucinodes orbonalis Guenée)

Wilted shoots (left) and fruit holes and tunnels (right) caused by the eggplant fruit and shoot borer (EFSB).

Wilted shoots (left) and fruit holes and tunnels (right) caused by the eggplant fruit and shoot borer (EFSB).

Fruit damage (dark holes) caused by EFSB in non-Bt eggplant fruits (Mara) compared to Bt eggplant counterpart fruits (M1) from plants in the same field block.

Fruit damage (dark holes) caused by EFSB in non-Bt eggplant fruits (Mara) compared to Bt eggplant counterpart fruits (M1) from plants in the same field block.

Eggplant is a popular vegetable grown throughout Asia. It is known to be heavily treated with insecticides to control the eggplant fruit and shoot borer (EFSB). This study is the first publicly available data on field performance in Asia of the eggplant engineered to produce the Bt Cry1Ac protein. It replicated field trials with five Bt eggplant open-pollinated (OP) lines from transformation event EE-1 and their non-Bt comparators in Pangasinan from 2010 to 2012.
The field trials documented levels of Bt protein expressed in plants and evaluated their efficacy against the primary target pest, EFSB. Cry1Ac concentrations ranged from 0.75 to 24.7 ppm dry weight with the highest in the terminal leaves (or shoots), and the lowest in the roots. Cry1Ac levels significantly increased from the vegetative to the reproductive stage. Bt eggplant lines demonstrated excellent control of EFSB. Bt eggplant lines and their non-Bt comparators were significantly different for all field efficacy parameters tested. Bt eggplant lines controlled EFSB shoot damage by 98.6–100%, and fruit damage by 98.1–99.7%. It also reduced EFSB larval infestation by 95.8–99.3% under the most severe pest pressure during Trial 2. Moths that emerged from larvae collected from Bt plants in the field and reared in their Bt eggplant hosts did not produce viable eggs or offsprings demonstrating that Bt eggplant lines provide outstanding control of EFSB and can dramatically reduce the need for conventional insecticides.

Link to the article: http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0157498
Impact Factor: (2015/2016) 3.057

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Allan Abraham B. Padama, Rovi Angelo B. Villaos and Jason R. Albia
Institute of Mathematical Sciences and Physics
College of Arts and Sciences
UP LOs Baños

CO-Induced Pd Segregation and the Effect of Subsurface Pd on CO Adsorption on CuPd Surfaces. Journal of Physics: Condensed Matter, 29 (2): 025005, 8 pages, 18 January 2017.

In designing CuPd-based materials for hydrogen purification and storage, hydrocarbon production, and separation membranes, the interaction of CO with CuPd is an important consideration. The manner in which CO is adsorbed on the surface dictates the dynamics of movement, temperature dependence, and overall surface mobility, among others. There had also been reports that the adsorption of CO on CuPd has the tendency to modify the CuPd configuration. In this work, we performed a DFT (density functional theory) calculation using van der Waals density functional (vdW-DF2), implemented on Quantum Espresso to investigate the dynamics of the CO interaction with CuPd surface. To model comprehensively CO adsorption on CuPd we considered various surface configurations/stoichiometry such as (Cu3Pd, Cu2Pd2, CuPd3). In addition, we also investigate the Pd segregation in Cu-rich CuPd surface by considering nonstoichiometric Cu3Pd structure. Results show that the calculated adsorption sites and corresponding adsorption energies agree well with experimental findings. Among the different nonstoichiometric Cu3Pd(111), the surface with ordered structure of bulk Cu3Pd () is the energetically most stable. The adsorption of CO induces Pd segregation to surface layers due to stronger CO-Pd than CO-Cu interaction. Lastly, we found that the presence of Pd subsurface atoms enhances CO adsorption. We believe that our findings will provide helpful insights to future investigations on reactions involving CO and CuPd-based systems.

Link to the article: http://iopscience.iop.org/article/10.1088/0953-8984/29/2/025005/meta
Impact Factor: (2015/2016) 2.209

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Alonzo A. Gabriel
Department of Food Science and Nutrition
College of Home Economics
UP Diliman

Utility of UV-C Radiation as Anti-Salmonella Decontamination Treatment for Desiccated Coconut Flakes. Food Control, 71: 117–123, January 2017.

Fig. 4. Ultraviolet-C radiated (a) and control (b) desiccated coconut samples, and baked coconut macaroons from treated (c) and control (d) samples.

Fig. 4.
Ultraviolet-C radiated (a) and control (b) desiccated coconut samples, and baked coconut macaroons from treated (c) and control (d) samples.

Fig. 1. Emission spectra of the 15 W UV-C lamp source showing predominant emission wavelength at 254 nm, at 15.0 cm source-to-detector distance.

Fig. 1.
Emission spectra of the 15 W UV-C lamp source showing predominant emission wavelength at 254 nm, at 15.0 cm source-to-detector distance.

Coconut is one of the chief exports of the Philippines. Desiccated coconut is one of the food products derived from this commodity and is used in baking and confectionary. Unfortunately, cases of Salmonella contamination on exported Philippines desiccated coconut has been reported. The use of bactericidal UV (UV-C) in decontaminating Salmonella on desiccated coconut and its effect on the sensorial characteristics upon use as ingredient and in macaroon making has been explored in this study.

Link to the article: http://www.sciencedirect.com/science/article/pii/S0956713516303334
Impact Factor: (2015/2016) 3.388

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Fernando P. Siringan
Marine Science Institute
College of Science
UP Diliman

Coral-Based Holocene Sea Level of Paraoir, Western Luzon, Philippines. Journal of Asian Earth Sciences, 123: 61–66, 1 June 2016.

Catchy title of research: Shallow-water corals in Paraoir, western Luzon, Philippines as indicators of past sea level

Fig.1. Comparison of sea level records of Paraoir, Currimao, Abrolhos Island and Tahiti.

Fig.1. Comparison of sea level records of Paraoir, Currimao, Abrolhos Island and Tahiti.

Sea level change was reconstructed using shallow-water corals from Paraoir, western Luzon, Philippines. This was done to to document deglacial sea level rise of the western Pacific. The sea level records obtained were consistent with those of north western Luzon and the western Australia coast. Discrepancies exist with the sea level records reported for Tahiti. The difference in sea level between the Philippines and Tahiti result from spatial variations of glacial isostatic adjustment of the two sites.

Link to the article: http://www.sciencedirect.com/science/article/pii/S1367912016300682
Impact Factor: (2015/2016) 2.647

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Rosario R. Rubite and Margaret C. De Guzman
Department of Biology
College of Arts and Sciences
UP Manila

Begonia titoevangelistae (sect. Baryandra, Begoniaceae) A New Species from Catanduanes Island, the Philippines. Phytotaxa, 282 (4): 273-281, 1 November 2016.

Catchy title of research: A new species of Begonia discovered in Catanduanes, Philippines

Begonia titoevangelistae from Nahulugan Falls, Gigmoto, Catanduanes Island is described as a new species endemic to the Philippines. Based on International Union for the Conservation of Nature (IUCN) red list criteria, B. titoevangelistae was assessed to be critically endangered, since it consists of one population with 300 individuals on a 100 m area around the waterfalls, which is being developed into a tourist spot.

Link to the article: http://biotaxa.org/Phytotaxa/article/view/phytotaxa.282.4.4
Impact Factor: (2015/2016) 1.087

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Jaimie Kim B. Arias*, Rowena A. Dorado*, Maria Emilinda T. Mendoza** and Vicente G. Ballaran***
Department of Economics*
College of Economics and Management
Department of Social Development Services**
College of Human Ecology
Institute of Agricultural Engineering***
College of Engineering and Agro-industrial Technology
UP Los Baños

Exploring the Potentials of a Technology-Based Flood Early Warning System in Laguna, Philippines: A Cost-Benefit Analysis” in Cost-Benefit Studies of Natural Resource Management in Southeast Asia. David James and Herminia A. Francisco (editors). Singapore: Springer, 2015.

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Kevin Carl P. Santos and Erniel B. Barrios
School of Statistics
UP Diliman

Improving Predictive Accuracy of Logistic Regression Model using Ranked Set Samples. Communications in Statistics – Simulation and Computation, 46 (1): 78-90, 2017.

Catchy title of research: Ranked Set Sampling: A Tool for Better Predictive Ability of Fitted Logistic Regression Model

Many real-life scenarios produce binary data such as in health sciences when a person can be classified as “positive” or “negative” of a certain disease, in credit scoring when predicting a customer if he would pose high risk to creditors or not, and in market research wherein they are interested in determining if a consumer would choose Product A or its competitor, Product B. In these instances where the response variable is binary, Logistic Regression is most commonly used. This research proposes the use Ranked Set Sampling (RSS) in selecting observations to ensure that the predictive ability of the fitted logistic regression model is better and more reliable than using Simple Random Sampling, avoiding the occurrence of the separation of likelihood. Furthermore, the paper found that RSS also works well even when the event of interest is rare in the population.

Link to the article: http://www.tandfonline.com/doi/full/10.1080/03610918.2014.955113
Impact Factor: (2015/2016) 0.397