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RISS 인기검색어
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- 저자 : Yuanjun Liu (검색결과 4 건)
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Guoyi Liu,Yuanjun Liu,Xiaoming Zhao 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.2
Considering sub-micron potassium titanate whiskers (BX-101), nanoscale potassium titanate whiskers (AX-301), sub-micron potassium titanate whiskers (AX-316) and high strength potassium titanate crystal (AX-319) as functional fillers, heat resistant ablative coated fabrics which have high radiant heat reflectivity were prepared. The effect of the type of functional fller on the thermal protection performance of heat resistant ablative coated fabrics was mainly discussed. Research showed that the microstructure of potassium titanate functional filler had a significant impact on the radiant heat reflectivity and thermal insulation performance of the prepared coated fabric. The coated fabric which took nanoscale potassium titanate whiskers (AX-301) with a minimum diameter and greater length-diameter ratio as functional filler has the highest thermal reflectivity and the best insulation property. Heat ray reflectivity of potassium titanate coated fabrics had positive correlation with their crystallinities. The higher the coated fabric crystallinity was, the greater the heat ray reflectivity. Thermogravimetric analysis results showed that after adding four kinds of potassium titanate fillers, the thermal stability of the prepared coated fabrics was enhanced, and the nanoscale potassium titanate whiskers (AX-301) coated fabrics had the best thermal stability.
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3D Model Retrieval Based on Orthogonal Projections
Wei, Liu,Yuanjun, He Society for Computational Design and Engineering 2006 International Journal of CAD/CAM Vol.6 No.1
Recently with the development of 3D modeling and digitizing tools, more and more models have been created, which leads to the necessity of the technique of 3D mode retrieval system. In this paper we investigate a new method for 3D model retrieval based on orthogonal projections. We assume that 3D models are composed of trigonal meshes. Algorithms process first by a normalization step in which the 3D models are transformed into the canonical coordinates. Then each model is orthogonally projected onto six surfaces of the projected cube which contains it. A following step is feature extraction of the projected images which is done by Moment Invariants and Polar Radius Fourier Transform. The feature vector of each 3D model is composed of the features extracted from projected images with different weights. Our System validates that this means can distinguish 3D models effectively. Experiments show that our method performs quit well.
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Mechanical and Creep Properties of Concrete containing Apricot Shell Lightweight Aggregate
Fan Wu,Changwu Liu,Wei Sun,Lianwei Zhang,Yuanjun Ma 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.7
In this study, the mechanical and creep properties of the apricot shell (AS) as a replacement for the coarse aggregate were investigated. The alternative volume ratio of the coarse aggregate was set as 0%, 25%, 50%, 75% and 100%, respectively. The results showed that the coarse aggregate was completely replaced by the AS, the compressive strength, splitting tensile and flexural strength, and modulus of elasticity of apricot shell concrete (ASC) were 26.1 MPa, 1.85 MPa, 3.18 MPa, and 9.3 GPa, respectively, and decreased by 32.6%, 30.7%, 24.8%, and 34.5% compared to the concrete without AS, respectively. However, the oven dry density of AS100 mixture was 1,762 kg/m3, which fulfilled the density requirement of structural lightweight aggregate concrete (LWAC). The creep strain of concrete increased by increasing AS content. When the coarse aggregate was replaced by 100% AS, the strain of AS100 mixture at 380 hours was 16.84 × 10−4. The results indicate that LWAC with an acceptable performance can be produced by using AS as coarse aggregates in concrete.
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Co–Fe Bimetal Phosphate Composite Loaded on Reduced Graphene Oxide for Oxygen Evolution
Guoxing Zhu,Xulan Xie,Lisong Xiao,Xiaoyun Li,Xiaoping Shen,Yuanjun Liu 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.1
Development of high-performance nonprecious metal-based catalysts for oxygen evolution reaction (OER) is crucial to improve the efficiency of water electrolysis and photoelectrochemical water splitting for harvesting and storage of solar energy. Herein, Co–Fe phosphates and their composites with reduced graphene oxide (rGO) were prepared by a simple hydrothermal method, which then acted as oxygen evolution reaction catalysts. In 1.0 M KOH aqueous solution, the as-obtained optimal composite, Co–Fe phosphate/rGO, can catalyze oxygen evolution reaction with a very sharp onset potential and a small over-potential of 338 mV to achieve a current density of 10 mA cm -2. It was found that in these Co–Fe phosphates, the optimal Co:Fe ratio is 0.75:0.25. The excellent electrocatalytic performance of the Co–Fe phosphate/rGO composite would benefit from the synergistic effects between Fe and Co species, as well as rGO substrate providing conductive channels. The formed Co–Fe phosphate/rGO electrocatalysts can be the promising replacement of precious metal-based catalysts for more practical and cost-efficient water splitting.
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