Browsing by Author "Wang, H"

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item: Conference-Full-text
Efficient numerical methodology for the determination of thermal conductivity of asphalt mixtures
(Springer, 2021) Wang, H; Chu, L; He, L; Fwa, TF; Pasindu, HR; Bandara, S; Mampearachchi, WK; Fwa, TF
Despite the importance of the thermal conductivity (k) to the study of pavement thermal behaviors, it is still a challenging task for engineers to come up with an efficient method for its determination without laborious laboratory measurements. Recently some computer-aided approaches were proposed to overcome the mentioned difficulty but still suffered from time-consuming and inefficient computation. This study presents a hybrid methodology for the determination of k value with a totally automatic program, employing genetic algorithm (GA) to achieving efficient model calibrations, coupled with the finite element simulation tomake estimations of the thermal conductivity of the asphalt mixtures. The improved performance of the proposed method is demonstrated by a 2-D row-column structure model example to achieve a higher accuracy and efficiency existing approaches under the same conditions.
item: Conference-Full-text
Re-examining contractor’s BIM strategies: a case study
(Ceylon Institute of Builders, 2015-06) Wang, H; Chen, LK; Lu, W; Sandanayake, YG; Fernando, NG; Karunasena, GI
In the construction industry, building information modelling (BIM) is a promising technology to maintain a contractor’s business competitive advantages. Although some BIM guides for contractors have been released by a set of countries or institutes, the BIM strategies as a part of contractors’ business developmental strategies are rarely discussed. This paper aims to empirically investigate the BIM strategies for contractors from the institutional perspective. A case study of a German contractor is conducted. Data collected through interviews, site visit, and survey/questionnaire are analysed to identify the best practices in a leading contractor company in BIM lifecycle implementation. Suggestions are provided to better implement BIM in contractors’ long-run business developmental strategies.
item: Article-Full-text
Topological relations and piezoelectric responses of crystal-axis-oriented BaTiO3/CaTiO3 nanocomposites
(Royal Society of Chemistry, 2017) Hu, D; Niu, X; Ma, H; Zhang, W; Sewvandi, GA; Yang, D; Wang, X; Wang, H; Kong, X; Feng, Q
2D crystal-axis-oriented mesocrystalline BaTiO3/CaTiO3 (BT/CT) nanocomposites with high-density heteroepitaxial interfaces were synthesized by a two-step solvothermal soft chemical process. The nanostructures, formation mechanism, topological relations between the BT and CT, and piezoelectric responses of the nanocomposites were investigated. The mesocrystalline nanocomposites are polycrystals constructed from crystal-axis-oriented BT and CT nanocrystals with the same crystal-axis orientation, respectively. The directions of the [001] and [1−10] of crystalline BT correspond to the directions of the [0−10] and [100] of crystalline CT, respectively. The mesocrystalline nanocomposites were formed via an in situ topochemical mesocrystal conversion mechanism. The density of the artificial BT/CT heteroepitaxial interface in these mesocrystalline nanocomposites can be adjusted by regulating the fraction of BT and CT in the nanocomposites. The mesocrystalline BT/CT nanocomposite with the composition close to BT/CT = 1/1 presents a large piezoelectric response owing to the lattice strain derived from its heteroepitaxial interfaces with the high density in the nanocomposite.