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M. I. Pech-Canul,M. Rodríguez-Reyes3,M. A. Pech-Canul,J. C. Rendón-Angeles 대한금속·재료학회 2011 METALS AND MATERIALS International Vol.17 No.6
In this work, SiC_P and SiC_P/SiO_2 porous preforms were infiltrated without assistance in Ar→N_2 atmosphere with the alloy Al-10.3 Mg-12.04 Si (wt.%) at 1050 and 1100 °C, for 20, 40 and 60 min. It was found that a decrease in residual porosity and an increase in elastic modulus by about 22 % with respect to composites produced without SiO_2 additions to the preforms are associated with the formation of magnesium aluminate spinel (MgAl_2O_4). A concurrent increase of the matrix hardness is ascribed to a strengthening mechanism by MgAl_2O_4 formation, similar to the strengthening observed with Mg_2Si in aluminum alloys. Therefore, the spinel can be considered as a co-reinforcement of SiC_p in the aluminum matrix composites. Reactions for spinel formation and possible mechanisms for hardness enhancement are outlined.
Rosalie Reyes,Ma. Divina Angela Bauzon,Nikki Alen Pasaje,Rey Mark Alfante,Pocholo Miguel De Lara,Marion Ordillano,Paul Caesar Flores,Abegail Rediang,Patrick Anthony Nota,Fernando Siringan,Ariel Blanco 대한공간정보학회 2022 Spatial Information Research Vol.30 No.2
One of the consequences of climate change is sea level rise (SLR). Near the coast SLR varies at different locations due to the contributions from regional/local climatic and non-climatic factors. Vertical land motion (VLM) can affect the accuracy of sea level observations from tide gauges (TG) that may exacerbate coastal area inundation/flooding. This study investigated the viability of Permanent Scatterer Interferometric Synthetic Aperture Radar (PSInSAR) to quantify the rate of VLM at the TG sites. Measurements from TG co-located GNSS receivers provide the actual VLM rates and ground truth for PSIn- SAR-derived rates. Based on the results from the 9 study sites, almost all except one are subsiding. Both PSInSAR and GNSS solutions showed the same trend with rates that correlate at 0.89. Analysis from 20 Active GNSS stations showed 95% of the sites are undergoing land subsidence. This should be a cause of concern for communities near the coastal areas.
Determinants of Philippine Prawn and Coconut Oil Exports
Julieta A. Delos Reyes,Bates M. Bathanb,Joshua DC. Moretoc,Jandhe S. Reyes The International Academy of Global Business and T 2018 The International Academy of Global Business and T Vol.14 No.1
Prawn and coconut oil are traditional export commodities of the Philippines. They are mainly exported to Japan, the United States, and the Netherlands. This study assessed the effects of domestic production and income, domestic and export prices, foreign exchange rate, and trade agreements on the volume of Philippine exports of these two commodities to the top destination countries . The trade agreements focused on the Japan- Philippines Economic Partnership Agreement in the case of prawn, and the country‟s accession to the General Agreement on Tariffs and Trade, now the World Trade Organization, for coconut oil. Multiple regression analysis was employed to determine the factors affecting export volume. Problems and challenges in the local industries and export markets were identified, and recommendations to improve the export demand of Philippine prawn and coconut oil were also provided.