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Haiying Ma,Minghui Lai,Ye Xia 국제구조공학회 2022 Structural Engineering and Mechanics, An Int'l Jou Vol.81 No.1
Prestressed prefabricated hollow core concrete slabs with spans of 5 m and 10 m are commonly used since last century and still in service due to the advantage of construction convenience and durability. However, the end slabs are regularly subjected to cracks at the top and fail with brittleness due to the asymmetric boundary conditions. To better maintain such widely used type of hollow core slabs, the effect of asymmetric constraint in the end slabs are systematically studied through detailed nonlinear finite element analyses and experimental data. Experimental tests of slabs with four prestressed tendons and seven prestressed tendons with different boundary conditions were conducted. Results observe three failure modes of the slabs: the bending failure mode, shear and torsion failure mode, and transverse failure mode. Detailed nonlinear finite element models are developed to well match the failure modes and to reveal potential damage scenarios with asymmetric boundary conditions. Recommendations regarding ultimate capacity of the slabs with asymmetric boundary conditions are made to ensure a safe and rational design of prestressed concrete hollow slabs for short span bridges.
Activities before Idea Generation in Creative Process — What Do People Do to Catch Their Muse?
Haiying Long 대한사고개발학회 2011 The International Journal of Creativity & Problem Vol.21 No.2
Activities involved before people generate their creative ideas were examined by employing a qualitative method. Twenty graduate students and scholars were interviewed. Three main activities were identified by content analysis: accumulating ideas; integrating ideas; and communicating ideas. These activities showed dynamic interactions during the process. The activities of accumulating and integrating ideas were found in some creativity models. This supports the ideas that creativity includes both generality and specificity and that creativity assessment varies by methods and contexts. Although communication is an important activity, creative ideas are also generated by individual themselves. It confirms that the process of generating creative ideas includes individual efforts and social interactions. However, further research is needed regarding early cycle activities in other contexts and activities in late cycle creative processes.
Haiying Wang,Qiaoping Li,Linghua Zhuang,Guowei Wang,Jie Sun 한국섬유공학회 2018 Fibers and polymers Vol.19 No.1
3,3'-[1,2-ethanediylbis (oxy-2,1-ethanediyl)]-bis[1-methyl-imidazolium]-dibromide (DImDBr), a gemini imidazolium ionic liquid, was synthesized for the modification and dyeing promotion of poly(ethylene terephthalate) (PET) filaments. The results showed that parameters such as treatment temperature, time, and DImDBr concentration played a critical role on the tensile strength and tensile strength retention of modified PET filaments. The optimal treatment parameters of the PET filaments were 120 ℃ for 90 min with addition of 6 % ionic liquid. The influence of disperse dyeing parameters (temperature, time, and dye concentration) on DImDBr modified PET filaments were also studied. The disperse dyed PET filaments (after treatment with DImDBr) exhibited a desirable color strength (K/S value), excellent soap washing fastness, light fastness, and rubbing fastness. Furthermore, the native PET filaments and DImDBr treated PET filaments werecharacterized by FT-IR, XRD, DSC, TGA, and SEM. Density functional theory (DFT) simulation showed the presence of two kinds of hydrogen bonds (C-H/O and O-H/Br) and eight strong hydrogen bonds in the DImDBr/cis-PET monomers, while only three hydrogen bonds were found in the DImDBr/trans-PET monomers. The structural transformation from the crystalline phase to the amorphous phase (FT-IR, XRD, and DFT simulation) after DImDBr modification confirmed thedyeing promotion of PET filaments at lower temperature.
Research on the Electric Vehicle Control System
Haiying Wang,Tianjun Sun,Xingbo Zhou,Qi Fan 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.8
With the development of electric vehicle electronic control unit (ECU) for vehicle control technology and the key to raise the level of design electric vehicles the optimization control of the vehicle performance as direction. In order to achieve the rational, coordination of vehicles within the system of integrated control, based on the modular thought, through constructing the distributed control network design overall structure of the control system of pure electric vehicle, the vehicle controller is analyzed on the working principle and its function realization degree, as a pure electric vehicle control system provides the theory basis for performance evaluation.