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- 저자 : Yanju Liu (검색결과 7 건)
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Electric field induced variation of temperature and entropy in dielectric elastomers
Liwu Liu,Jinrong Li,Yanju Liu,Jinsong Leng,Junqing Zhao,Jianwen Zhao 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.1
Dielectric elastomer is a kind of typical electro-active polymer material. Under external electric field it can produce large electrostrictiondeformation and possesses the advantages of high elastic energy density, super short response time, high efficiency, and so on. It iswidely used in the artificial muscles, facial expressions, actuators, energy harvesters, sensors, robots and Braille display devices, and alsoshows huge application potential in the aerospace and intelligent bionic areas. We built the free energy of the dielectric elastomer electrical-mechanical coupling system and investigated its constitutive relation and stability behavior. Then we calculated the elastomer’s criticaldeformation suffering from the voltage. If electrical breakdown, electromechanical instability and snap-through instability can beavoided, the large electrostriction deformation can induce adiabatic temperature change and isothermal entropy change of the dielectricelastomer. We used the entropy-temperature or electric displacement-electric field plane to describe the temperature change and entropychange of dielectric elastomer undergoing large electrostriction deformation. With the influence of temperature, we developed a temperatureand deformation coupling thermodynamical free energy model to calculate the electric field induced variation of temperature andentropy in dielectric elastomers. The results should offer great help in guiding the design and fabrication of excellent actuators featuringsoft dielectric elastomers.
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Electromechanical coupling modeling simulation and experimental study of crawler
Yanju Ji,Xueying Lv,Liu Zhang,Guanyu Zhang 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.2
The electromechanical coupling performance of crawler machinery is investigated. A dynamic equation of electromechanical coupling of crawler machinery is established under multi-typical working conditions. The variation in performance of electromechanical parameters during unstable operations over time is analyzed using the virtual prototype and electromechanical coupling model of crawler machinery. The correctness of the electromechanical coupling model is confirmed by comparing the theoretical analysis, virtual prototype simulation, and physical prototype results. This study provides accurate and valuable theoretical methods and fundamental knowledge to analyze the electromechanical and road driving performance as well as to develop and design a crawler machinery.
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Sufang Chen,Yanju Qiu,Xixi Xing,Cunwen Wang,Chengchao Liu,Yuhua Zhang,Jingping Hong,Jinlin Li,Daohong Zhang 한국고분자학회 2020 Macromolecular Research Vol.28 No.3
Among the Fischer-Tropsch synthesis (FTS) catalysts, Cobalt catalysts are currently attracting a lot of research interests due to their high activity and high selectivity. But the dispersion and reducibility of cobalt catalysts with moderate interaction between cobalt and support are still a challenge. A novel amino-ended hyperbranched polyamide (AEHPA) was used to modify SBA-15 and then was applied as support for obtaining cobalt catalyst (15Co/SBA-15-N). The catalysts were characterized by XRD, TEM, XPS and H2-TPR techniques. The results showed that AEHPA doped mesoporous SBA-15 caused the generation of N species in the SBA-15 pore channels. The N-Co bonds resulted in the formation of highly-dispersed cobalt nanoparticles with uniform sizes inside the ordered mesopores of support. AEHPA doping was an effective way to modify the surface properties of the SBA-15 for immobilizing cobalt nanoparticles. Compared with the conventional 15Co/SBA-15 catalyst without doping AEHPA, the AEHPA doped 15Co/SBA-15-N catalyst showed improved cobalt dispersion and stabilized cobalt location, which led to much better reaction stability as well as C5+ selectivity.
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Bo Wang,Bairui Tao,Yanju Liu,Xiaoxin Du 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.2
In the study of mine GIS index optimization of mining decision support system, in order to reduce the overlap between the index nodes, in this paper we propose the intensity of polygon to ensure the index nodes have good geometry. In this paper, we also put forward artificial fish swarm clustering based on Voronoi diagram (AFSCV) and apply the AFSCV to mine GIS index splitting algorithm. In the end, we give the optimization rules of AFSCV. In order to verify the effectiveness of our algorithm we compare our method with traditional methods, the experimental results show that our method can improve the query performance of mine GIS database and greatly reduce the overlap which generates from reinsert after the index node split.
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Amorphous Bimetallic Nanowires with High-Performance Microwave Absorption: A Case for FeCo Nanowires
Junyao Shen,Yongtao Yao,Yanju Liu,Jinsong Leng 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.4
Amorphous FeCo nanowires (NWs) with the average diameter of 120 nm were successfully prepared with a magnetic-field-assisted (MFA) hydrothermal method. Rapid reaction time was adopted to obtain amorphous FeCo NWs, being checked by XRD and TEM. Tuning the stoichiometric ratio of Fe/Co content meets the optimal impedance matching under different absorption frequency, making both improved intensities and frequency ranges of microwave absorption. For example, under 3mm coating thickness, the reflection loss (RL) peaks of Fe3Co7, Fe5Co5 and Fe7Co3 NWs are -25.88 dB at 4 GHz, -19.06 dB at 4.24 GHz and -21.98 dB at 5.44 GHz. The related efficient absorption bandwidths (fE < -10 dB) of Fe3Co7 NWs, Fe5Co5 NWs and Fe7Co3 NWs are 5.40 GHz, 3.52 GHz and 4.91GHz, respectively. It is ascribed to integrating enhanced dielectric/conductive losses, negligible damages from eddy current effect and good impedance matching for high-performance FeCo NWs absorbers. This work paves a new path on synthesizing bimetallic wire-like nanostructures for microwave absorption demands.
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Thermal stability of biochar and its effects on cadmium sorption capacity
Qi, Fangjie,Yan, Yubo,Lamb, Dane,Naidu, Ravi,Bolan, Nanthi S.,Liu, Yanju,Ok, Yong Sik,Donne, Scott W.,Semple, Kirk T. Elsevier Applied Science 2017 Bioresource technology Vol.246 No.-
<P><B>Abstract</B></P> <P>In this study, the thermal stability of a wood shaving biochar (WS, 650°C), a chicken litter biochar (CL, 550°C) and an activated carbon (AC, 1100°C) were evaluated by combustion at 375°C for 24h to remove the labile non-carbonized organic matter. Results showed that WS and CL biochars were not thermally stable and can lose most of the organic C during combustion. The combusted WS and CL biochars retained considerable amounts of negative charge and displayed higher sorption for Cd (from 5.46 to 68.9mg/g for WS and from 48.5 to 60.9mg/g for CL). The AC retained 76.5% of its original C and became more negatively chargely after combustion, but its sorption for Cd slightly decreased (from 18.5 to 14.9mg/g). This study indicated that after potential burning in wildfires (200–500°C), biochars could have higher sorption capacity for metals by remaining minerals.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Moderate temperature (550–650°C) biochars contained mostly labile organic C (OC). </LI> <LI> Biochar OC was not thermally stable and easily oxidized by wildfire (200–500°C). </LI> <LI> Combusted (375°C) biochars were mineral dominant and negatively charged. </LI> <LI> Biochar combustion residues showed a higher and stronger sorption capacity for Cd. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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