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Rui-Rui Zhang,Bin Wu,Peng Chen,Jia-Sheng Qian 한국고분자학회 2020 폴리머 Vol.44 No.6
The molecular dynamics simulation was used to study and design a polymer composites system with excellent mechanical strength and less heat generation in a dynamic process. A series of system factors such as filler loading, surface modification onto filler, and network of cross-linking filler particles on mechanical and heat generation of polymer composites are systematically considered. It is found that the surface grafting onto fillers can restrain the heat generation of polymer composite in the dynamic process, while it shows less effect on the mechanical property. A network of cross-linking filler particles can be fabricated by a combination of grafting chains onto fillers. By filling such a network into the polymer, the mechanical and heat generation properties of polymer composites are significantly improved. Simulation results can help experimental fabrication of polymer composites with excellent mechanical and heat generation properties.
An ABA triblock copolymer strategy for intrinsically stretchable semiconductors
Peng, Rui,Pang, Bo,Hu, Daqing,Chen, Mengjie,Zhang, Guobing,Wang, Xianghua,Lu, Hongbo,Cho, Kilwon,Qiu, Longzhen The Royal Society of Chemistry 2015 Journal of Materials Chemistry C Vol.3 No.15
<▼1><P>A novel semiconductor–rubber–semiconductor triblock copolymer has been designed and prepared according to the principle of thermoplastic elastomers (TPEs). It behaves as a TPE and exhibits good electrical properties.</P></▼1><▼2><P>A novel semiconductor–rubber–semiconductor (P3HT–PMA–P3HT) triblock copolymer has been designed and prepared according to the principle of thermoplastic elastomers. It behaves as a thermoplastic elastomer with a Young's modulus (<I>E</I>) of 6 MPa for an elongation at break of 140% and exhibits good electrical properties with a carrier mobility of 9 × 10<SUP>−4</SUP> cm<SUP>2</SUP> V<SUP>−1</SUP> s<SUP>−1</SUP>. This novel semiconductor may play an important role in low-cost and large-area stretchable electronics.</P></▼2>
Rui Peng,Tong Zhuang 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.7
In order to explore the micro-cracking behavior and fractal characteristics of sandstone with different particle sizes under the condition of compression-shear test, this paper studies sandstone with different particle sizes by using high-strength concrete wrapped in cylindrical sandstone test specimen to carry out a compression-shear mechanical test, with the assistance of performing 3D optical scanning on the fracture surface of sandstone after shear failure by using MATLAB to re-establish the three-dimensional shape of the fracture surface. The roughness parameter of the joint surface is introduced to quantitatively calculate the fracture structural plane, which found that the roughness parameter manifests the damage of the structural plane well. The roughness of fracture surface is negatively correlated with the particle size of sandstone, that is, the roughness of fracture surface increases with the decrease of particle size. The fractal dimension of the structural trace line and the sampling area is calculated according to the digital model. Obvious anisotropic characteristics are observed in both dimensions, where the fractal dimension is positively correlated with the particle size of sandstone, in another word, the fractal dimension decreases along with the particle size. The above research results provide experimental support in scientific theory for clarifying the instability mechanism of sandy rock roadway under compression-shear conditions.
A Harmony Search Based Low-Delay and Low-Energy Wireless Sensor Network
Zhen-Rui Peng,Hong Yin,Hai-Tang Dong,Hui Li,An Pan 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.2
Aiming at different service quality requirements under different circumstances of wireless sensor network (WSN), harmony search (HS) algorithm is used to solve the low-delay and low-energy double-objective optimization problem in wireless sensor networks. First, analyze the low-delay and low-energy model, and establish the objective function. Then, use the priority-based path encoding algorithm to update harmony memory iteratively while searching the optimal path. Finally, simulation of 100-node network is carried out by using Matlab. The results show that sensor network data transmission path can be controlled according to the users’ needs of delay and power.
LEACH Protocol based Two-Level Clustering Algorithm
Zhen-rui Peng,Hong Yin,Hai-tang Dong,Hui Li 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.10
For wireless sensor networks, it is difficult to balance the energy distribution and reduce the energy consumption in the data transmission process. On the basis of the original LEACH protocol and level technique, a new method of cluster heads collection and two-level clustering transmission is proposed. By controlling the distances among the cluster heads, the uniform distribution of cluster heads is satisfied. And then using two-level mode, the data are transmitted to the base station. LEACH is compared with the improved method about the remaining energy and alive nodes. Simulation results show that the improved method can reduce the network consumption energy greatly and lengthens the network lifetime efficiently.
Design of a Bidirectional DC/AC Converter with Battery Charging/Discharging/Standing Balance Control
Liang-Rui Chen,Bo-Rui Xu,Chuan-Sheng Liu,Shao-wei Peng,Chia-Hsuan Wu 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
Battery cells connected in series have been widely used in high-voltage and high-power applications. In this paper, a single-phase battery energy storage system with battery balance charging, battery balance discharging, and power factor correction capabilities was developed. A prototype suitable for a single-phase 110V power supply was designed and implemented for verification. To verify its performance, three 48V/7Ah battery modules were used as normal batteries, and a 48V/5Ah battery module was used as a retired battery. The experimental results showed that the battery energy storage system has excellent battery balancing capability. Compared with that of the conventional system without balanced control, the balancing performance of the proposed system is increased by about 15.25% and 26.92%, respectively, when the system was operated in the converter and rectifier modes. In addition, the proposed system also had battery fault tolerance, and was compatible with recycled batteries and an independent power supply.
Xiang-Rui Meng,Rui Peng,Guang-Ming Zhao,Ying-Ming Li 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.5
We proposed a new classification method for stress-bearing structures in very-deep roadways. We conducted tests for roadwayengineeringmechanical properties, including rock mechanical tests and ground stress measurement of two caverns in very-deepwells. We suggested a classification method for stress-bearing structures based on shear stress. Tests revealed that rock strength in theshear direction was the lowest; the stress distributions of acoustic emission and hollow inclusion were highly similar. Based on theroadway-engineering mechanical properties of two caverns and numerical simulation and in-situ tests, the key bearing structureswere classified based on the concentrated shear stress. In deep caverns, shear stress was more concentrated on the softer surroundingrock, the key bearing structure areas, and the more seriously fractured surrounding rocks. Using the loose circle in-situ test, wecompared the classification method of the key bearing structures with other classification methods. The results revealed agreementwith the classification methods used for the key bearing structures. The deformation in-situ test showed that the strata convergence ofconcentrated shear stress areas developed quickly. Therefore, the phenomena of concentrated shear stress and the expanded range ofkey bearing structures are the structural instability mechanisms of deep roadways.