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22. Weighted Competitive-Collaborative Representation Based Classifier for Imbalanced Data Classification

Author

Li, Yanting, Wang, Shuai, Jin, Junwei, Philip Chen, C. L., Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Fang, Lu, editor, Povey, Daniel, editor, Zhai, Guangtao, editor, Mei, Tao, editor, and Wang, Ruiping, editor

Published
2022
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49. Pteris vittata plantation decrease colloidal phosphorus contents by reducing degree of phosphorus saturation in manure amended soils

Author

Sangar Khan, Miaomiao He, Paul J. Milham, Jin Junwei, Kamel Mohamed Eltohamy, Xinqiang Liang, Fayong Li, and Yasir Hamid

Subjects
Cambisol, Environmental Engineering, biology, Phosphorus, chemistry.chemical_element, Pteris, General Medicine, Management, Monitoring, Policy and Law, engineering.material, biology.organism_classification, Manure, Soil, Nutrient, chemistry, Environmental chemistry, Pteris vittata, Soil water, engineering, Anthrosol, Fertilizer, Waste Management and Disposal, Ecosystem
Abstract

The agricultural use of manure fertilizer increases the phosphorus (P) saturation of soils and the risk of colloidal P (Pcoll) release to aquatic ecosystems. Two experiments were conducted to identify whether Pteris vittata plantation can decrease Pcoll contents in two soils (Cambisol and Anthrosol) amended with various manure P rates (0, 10, 25, and 50 mg P kg−1 of soil). The total Pcoll contents in manured soil without P. vittata were 1.14–3.37 mg kg−1 (Cambisol), and 0.01–2.83 mg kg−1 (Anthrosol) across manure-P rates. The corresponding values with P. vittata were 0.97–2.33 mg kg−1 (Cambisol) and 0.005–1.6 mg kg−1 (Anthrosol). Experimentally determined colloidal minerals (Fe, Al, Ca), colloidal total organic carbon, Mehlich−3 nutrients (Fe, Al, and Ca), and the degree of P saturation were good predictors of Pcoll concentrations in both soils with and without P. vittata plantation. In unplanted soils, P adsorption decreased and the degree of P saturation increased which released more Pcoll. However, P. vittata plantation decreased the Pcoll release and P loss risk due to the increase of P adsorption and reduced DPS in both soils. The P fractions (NaOH, NH4F, and HCl–P) contributed to increase the P pool in planted soils which enhanced the bioavailability of Pcoll and increased the P. vittata biomass. It suggested that P. vittata plantation was an effective approach to reduce Pcoll release from manure amended soils.

Published
2021

50. A Framework for Interpreting Lateral Swelling Pressure in Unsaturated Expansive Soils

Author

Jin Junwei, Li Mingyu, Yunlong Liu, and Wei Yanqing

Subjects
021110 strategic, defence & security studies, Article Subject, Expansive clay, 0211 other engineering and technologies, Foundation (engineering), Swelling pressure, 02 engineering and technology, Engineering (General). Civil engineering (General), Key factors, Geotechnical engineering, Boundary value problem, TA1-2040, Pile, Civil infrastructure, Soil mechanics, Geology, 021101 geological & geomatics engineering, Civil and Structural Engineering
Abstract

Lateral swelling pressure (LSP) develops when expansive soil volume increment associated with water infiltration is restrained in a confined domain, for example, due to construction of civil infrastructure. In this paper, initially a flowchart is developed to highlight various key factors that influence the LSP mobilization according to lab and field studies collected from previous literature studies. Then extending unsaturated soil mechanics, a theoretical framework is proposed for illustrating the LSP mobilization in the field against retaining structures and pile foundations under different boundary conditions, respectively. An example problem for a basement wall and a pile foundation constructed in a typical expansive soil from Regina, Canada, is presented to illustrate the proposed theoretical framework. The framework and corresponding analysis presented in this paper can facilitate to provide rational designs of geotechnical infrastructures in expansive soils.

Published
2021

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