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- 저자 : Jianlan Zhang (검색결과 3 건)
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Yating Zhang,Pei He,Dongxian Zhuo,Jianlan Zhang,Nana Zhang,Xiaobo Wang,Gang Lin,Zhenghan Kong 대한금속·재료학회 2024 ELECTRONIC MATERIALS LETTERS Vol.20 No.2
Exploration of highly effi cient non-noble metal oxygen reduction reaction (ORR) catalysts is essential for the widespreadindustrial utilization of fuel cells. Herein, we demonstrated a hierarchical porous catalyst (denoted as Fe-NC-Gs) using asimple stirring and one-step pyrolysis method. ZIF-8-derived N-doped carbon framework loaded on graphene oxide, on whichFe 3 O 4 and FeS nanoparticles are uniformly dispersed. In the composite nanostructure, a high surface area (470.58 m 2 g −1 )and hierarchical porous structure were observed. The obtained Fe-NC-G-2 exhibits superior ORR properties. The half-wavepotential (E 1/2 ) and the limiting current density in alkaline media were up to 0.85 V and − 5.39 mA cm −2 , respectively, comparableto the commercially available Pt/C. The four-electron-dominated process was exhibited in the ORR catalysis. It alsomanifests a better methanol tolerance and electrochemical stability during the chronoamperometry measurement in 0.1 MKOH. These results suggest that the proposed strategy provides a new pathway to construct effi cient electrocatalysts for ORR.
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Improved Algorithm of Association Matching for Pedestrian Tracking in Occlusion Scene
xiaofeng ZHANG,jianlan LIAO,dixing LI,guowei YANG 보안공학연구지원센터 2016 International Journal of Signal Processing, Image Vol.9 No.1
In order to improve the association matching of multiple pedestrians in occlusion scene, an improved algorithm is proposed in this paper that combines the similarity matching of pedestrian object’s major color spectrum histogram combination with joint probabilistic data association. The similarity to major color spectrum histogram of pedestrian’s object is calculated between the previous and the frame that current frames in this algorithm. And take the centroid location of pedestrian’s target which is with the most largest similarity to correct the state vector of the JPDA algorithm in the current frame. The experimental results show that the proposed algorithm could make the number of the targets’ label adhesion reduced to 40%, the number of the targets’ label confusion decreased about 33%, the recall rate of targets is increased by 6.8%, and the tracking accuracy is improved by 9.2% compared with the classical JPDA algorithm when the occlusion rate between pedestrians and intensity are not very high.
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Optimum Blank Design of Thick-Plate Metal Forming without Blank Holder
Jian Lan,Mianli Zhang,Huajie Mao,Maosheng Shu,Lin Hua 한국소성가공학회 2010 기타자료 Vol.2010 No.6
Many blank design methods are used in sheet metal forming industry, but most of them originated from applications of thin sheet metal forming with blank holder. There are few researches on blank design methods of thick-plate metal forming without blank holder, which process has two characteristics: workpiece thinning locally and severely, workpiece inside surface not contacting with top punch because of local bulk deforming. An optimum blank design method is proposed in this paper for the thick-plate metal forming without blank holder. This method consists of two stages: the initial blank design stage and the blank optimization stage. The first stage is to obtain initial blank shape using Inverse Finite Element Approach (IFEA) from the middle-thick layer of 3D model of target part. In the second stage, firstly, simulate and obtain deformed workpiece by forward finite element analysis; then calculate the shape error between deformed workpiece and target part, and the indicator △ of optimization procedure; finally, correct the blank shape by the feedback of shape error until the indicator △ is smaller than tolerance. In order to verify the proposed method, a reverse arm bracket is investigated.
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