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Bonifacio O. Pasion,Carolyn DP. Barrias,Milagrosa P. Asuncion,Abelardo H. Angadol,Robert R. Pabiling,Arsenio Pasion Jr.,Archiles A. Braulio,Agaton M. Baysa Jr. 국립중앙과학관 2021 Journal of Asia-Pacific Biodiversity Vol.14 No.1
Riparian zones are a small portion of a watershed but hold a diverse and important ecosystem functioning. We assessed diversity and carbon density of pole (5e10 cm DBH) and canopy (>10 cm DBH)trees along a riparian zone in Pasonanca Natural Park, southern Philippines. We identified 66 species,which included 41 canopy and 54 pole tree species, and comprised 46 indigenous, 18 Philippine endemics,and two exotic species. We recorded eight vulnerable (VU) and two endangered (EN) speciesunder the Philippine Red List, whereas five VU, three EN, and six critically endangered (CR) species wererecorded under the IUCN Global Red List. We estimated the Hill number of canopy trees at 60.91 12.14species and the Shannon diversity H’ was 49.57 5.15, whereas the pole tree was 77.87 12.60 specieswith diversity H’ of 33.07 3.77. The estimated carbon density was 128.42 39.04 MgC ha 1, majorityfrom canopy trees (101.51 63.52 MgC ha 1). We found an asymptotic and strong positive relationship(R2 ¼ 0.81; p ¼ <0.001) between species dominance and carbon density. Our result highlighted the roleof dominant species in maintaining ecosystem function, which can be considered when managing riparianecosystems as they perform better in storing and sequestering carbon.
Victor Bonifacio Vela-Moreno,Arnulfo Luévanos-Rojas,Sandra López-Chavarría,Manuel Medina-Elizondo,Ricardo Sandoval-Rivas,Carmela Martínez-Aguilar 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.84 No.4
This paper presents a new model to obtain the minimum area of the contact surface for rectangular isolated footings, considering that the contact surface works partially to compression (a part of the contact surface of the footing is subjected to compression and the other is not in compression or tension). The methodology is developed by integration to obtain the axial load “P”, moment around the X axis “Mx” and moment around the Y axis “My”. This document presents the simplified and precise equations of the four possible cases of footing subjected to uniaxial bending and five possible cases of footing subjected to biaxial bending. The current model considers the contact area of the footing that works totally in compression, and other models consider the contact area that works partially under compression and these are developed by very complex iterative processes. Numerical examples are presented to obtain the minimum area of rectangular footings under an axial load and moments in two directions, and the results are compared with those of other authors. The results show that the new model presents smaller areas than the other authors presented.
Kinetics and equilibrium partitioning of dissolved BTEX in PDMS and POM sheets
Nam, G. U.,Bonifacio, R. G.,Kwon, J. H.,Hong, Y. Springer Science + Business Media 2016 Environmental Science and Pollution Research Vol.23 No.18
<P>Passive sampling of volatile organic chemicals from soil and groundwater is primarily important in assessing the status of environmental contamination. A group of low molecular weight pollutants usually found in petroleum fuels, benzene, toluene, ethylbenzene, and xylenes (BTEX) was studied for its kinetics and equilibrium partitioning with single-phase passive samplers using polydimethylsiloxane (PDMS) and polyoxymethylene (POM) as sorbing phase. PDMS (1 mm) and POM (0.076 mm) sheets were used for sorption of BTEX and concentrations were analyzed using GC-FID. The equilibrium absorption and desorption of PDMS in water was achieved after 120 min while POM sheets absorbed up to 35 days and desorbed in 7 days. The kinetic rate constants in PDMS is higher than in POM up to 3 orders of magnitude. Logarithms of partition coefficient were determined to be in the range of 1.6-2.8 for PDMS and 2.1-3.1 for POM. The results indicate that POM is a stronger sorbent for BTEX and has slower equilibration time than PDMS. The partitioning process for both polymers was found to be enthalpy-driven by measurement of K-d values at varying temperatures. K-d values increase at low temperature and high ionic strength conditions. Presence of other gasoline components, as well as dissolved organic matter, did not significantly affect equilibrium partitioning. A good 1:1 correlation between the measured and the predicted concentrations was established on testing the potential application of the constructed PDMS sampler on natural soils and artificial soils spiked with gasoline-contaminated water.</P>
Dizon, John Ryan C.,Bonifacio, Rolly,Park, Sung-Taek,Shin, Hyung-Seop The Korean Society of Superconductivity and Cryoge 2007 한국초전도저온공학회논문지 Vol.9 No.4
In practical applications of HTS tapes for electric devices such as coils and power cables, the jointing of HTS tapes is inevitable even though long length tapes have recently been achieved. The critical current, $I_c$, degradation behaviors with tensile and bending deformations were investigated in commercially available YBCO coated conductor tapes. When the V-I relationship was measured at the jointed section of the lap-jointed YBCO CC tapes, the resistance at the joint decreased with increasing joint length. The critical load for 95% $I_c$ retention were determined for the IBAD and RABiTS YBCO tapes and they were 175 and 355N, respectively. Fracture occurred at the unjointed part which represents strong copper lamination and solder jointing. The electro-mechanical properties of lap-jointed CC tapes depended on the properties of single tapes. The V-I behavior under bending strain was similar with the tensile case.
신형섭,John Ryan C. Dizon,Rolly Bonifacio,박정수 한국초전도.저온공학회 2007 한국초전도저온공학회논문지 Vol.9 No.2
The critical current, Ic, degradation behaviorswith bending strain were investigated in a commercially available YBCO coated conductor tape. In particular, the strain reversibility of Ic and the influence of repeated bending on Ic have been studied. Also, repeated bending at 77 K was done in order to understand the Ic behavior under cyclic bending strains. A reversible behavior of Ic has been found up to a high bending strain of 1.60% for the RABiTS/MOD processed CC sample with copper reinforcement. Under repeated bending, the Ic showed a 95% I c retention up to 100 cycles for bending strains of 1.0% or less. The n-value behavior showed a good agreement with the Ic degradation behavior, representing that any cracking did not occur on the YBCO film resulting from the reinforcement provided by the copper stabilizers.
Bending Strain Characteristics of Critical Current in Double-Layered Bi-2223 Superconducting Tapes
Hyung-Seop Shin,Dizon, J.R.C.,Bonifacio, R.,Sung-Taek Park,Dong-Woo Ha,Sang-Soo Oh IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2
<P>The evaluation of reliability of HTS tapes is necessary for practical applications such as magnet, power cables, motors, SMES and HTS coils. The bending strain effect on the critical current, I<SUB>c</SUB>, in multifilamentary Bi-2223 HTS tapes have been investigated. Single and double layered tapes (for high current capacity) were subjected to thermal and pressurization cycles at pressurized liquid nitrogen (LN<SUB>2</SUB>) up to 1 MPa. After the pressurization test, the subsequent occurrence of damage like ballooning due to the diffusion and expansion of LN<SUB>2</SUB> into the tapes were investigated and compared. The Bi-2223 tapes showed different I<SUB>c</SUB> degradation behavior depending upon the geometry and ratio of reinforcement to superconductor adopted.</P>