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RISS 인기검색어
- 검색키워드
- 저자 : Bigya Gyawali (검색결과 2 건)
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Simulation of Permeation of Saturated Cement Paste Based on a New Meso-scale Pore Network Model
Yong Zhou,Yuxuan Yang,Bigya Gyawali,Weiping Zhang 한국콘크리트학회 2021 International Journal of Concrete Structures and M Vol.15 No.5
This paper presents the simulation of the permeation of saturated cement paste based on a novel pore network model. First, a 2D hydration model of cement particles was developed by extending the work of Zheng et al. 2005 to provide the background for the network construction. Secondly, the establishment of the pore network model and simulation of permeation of saturated cement paste were carried out. The irregular pores between any two hydrated cement particles were linearized with clear distances as the diameters of pores. The straight tubular pores were interconnected with one another to form the network model. During this process, the weighted Voronoi diagram was employed to operate on the graphical expression of the hydrated cement particles. Water permeation in saturated cement paste was simulated to verify the pore network model. Finally, the factors including water-cement ratio, reaction temperature, reaction time and cement particle size that would influence water permeation were numerically investigated.
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Kamal Raj Gosai,Tej Kumar Shrestha,Samuel D. Hill,Surya Man Shrestha,Bigya Gyawali,Daya Nidhi Gautam,Achyut Aryal 국립중앙과학관 2016 Journal of Asia-Pacific Biodiversity Vol.9 No.3
The sarus crane (Grus antigone antigone) is listed as “vulnerable” in the International Union for Conservation of Nature (IUCN) Red List of Threatened Species. Sarus cranes are distributed in the lowlands, but most live outside protected areas, especially in agricultural areas and wetlands of Nepal. The continuous expansion of agricultural land and the reduction of wetland habitats pose the greatest threats to the conservation of the species. We studied the sarus crane in the Rupandehi District of Nepal to understand their population structure, behavior, and current threats. We used the line (i.e., road) transect method from August 2013 to February 2014. The study area contained 147 sarus cranes. Agricultural land and wetland areas contained the highest number of sarus cranes. Our analysis showed that the population of sarus crane in the area has declined since 2007. Most sarus cranes lived in pairs. A single flock contained 13 cranes at maximum. Sarus crane behavior was not significantly different before and after the breeding seasons. Human–sarus crane conflict began when cranes started utilizing agricultural areas. The main threats to the hatching success and survival of sarus cranes in the Rupendehi District are egg theft and the hunting of cranes for meat. The findings of this study establish baseline information on the overall conservation status, habitat availability, and ecological behavior of sarus cranes in the district. We propose regular surveys to monitor sarus crane population levels in the face of multiple anthropogenic threats to their survival.
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