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RISS 인기검색어
- 검색키워드
- 저자 : Jingchun Liu (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Nanocrystalline Copper Coatings Produced by Cold Spraying
Jingchun Liu,Hua Cui,Xianglin Zhou,Jishan Zhang,Xiangkun Wu 대한금속·재료학회 2012 METALS AND MATERIALS International Vol.18 No.1
Copper powder was cryomilled for 12 hours to achieve particle size in the range of 2 µm to 25 µm, which powder was subsequently used as feedstock for the deposition of nanocrystalline (nc) Cu coating via cold spraying. The as-milled copper powder was characterized by X-ray diffraction (XRD), scanning electron micros-copy (SEM) and high resolution transmission electron microscopy (HRTEM). The particle size of the cryomilled Cu powder was detected by laser scattering. The microstructure of the coating was analyzed using SEM and scanning transmission electron microscopy (STEM). The XRD and HRTEM analysis showed that the grain size of the cryomilled Cu powder was about 5 to 40 nm. This nanoscale structure was retained after the cold spraying. The nanoindentation analysis showed that the nc Cu coating hardness value reached 3.3GPa, which was higher than that of its coarse grained counterpart.
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Cross-Linked Sulfonated Poly(arylene ether nitrile)s with Low Swelling and High Proton Conductivity
Jingchun Liu,Penglun Zheng,Mengna Feng,Renbo Wei,Xiaobo Liu 한국고분자학회 2017 Macromolecular Research Vol.25 No.12
A series of cross-linked composite membranes were prepared from sulfonated poly (arylene ether nitrile) (SPEN) and 2, 5-diaminobenzensulfonic acid (DABSA) via a direct cross-linking method aiming to obtain low-swelling and excellent proton conductivity membrane. This experiment had two advantages: expectant low-swelling in the extreme temperatureand excellent proton conductivity. Besides, all cross-linked membranes showed excellent thermal stability which exhibiting a temperature of initial decomposition about 250 °C. The membranes showed the IEC values varying from 1.449 to 1.675 mmol·g-1. The result suggested that the SPEN-DABSA membranes are potential candidates as PEM in DMFCs.
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MRI Segmentation of a Prostate Based on Distance Regularized Level Set Evolution with a Priori Shape
Jingchun Peng,Yongde Zhang,Gang Liu,Jingang Jiang,Yanjiang Zhao 보안공학연구지원센터 2016 International Journal of Hybrid Information Techno Vol.9 No.11
Prostate segmentation from MRI is a necessary first step and plays a key role in different stages of clinical decision making process. In this paper, we propose a MR T1 Image segmentation method of the prostate based on distance regularized level set evolution with a deformable shape prior. To smooth the prostate image to reduce the noise, we introduce a prostate image with Gaussian kernel and get an edge indicator. To avoid the leakage induced on account of prostate boundaries missing, or blending with surrounding tissues, we introduce priori shape information to construct an energy function with a distance regularization term and an external shape energy term containing the edge indicator and minimize it by solving the gradient flow which can be implemented with a finite difference scheme. To verify the MRI segmentation method of a prostate presented in this paper, we utilize the optimal value of parameters λ, μ, α and ε in the distance regularized level set evolution model and the deformable shape prior of prostate to segment a part of images from normal prostate, benign hyperplasia prostate and cancer prostate. The experiment results show that the MRI segmentation method of prostate presented in this paper is effective for different situation of different patients.
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RPK118, a PX Domain-containing Protein, Interacts with Peroxiredoxin-3 through Pseudo-Kinase Domains
Long Yu,Lingling Liu,Chenyi Yang,Jian Yuan,Xiujuan Chen,Jianing Xu,Youheng Wei,Jingchun Yang,Gang Lin 한국분자세포생물학회 2005 Molecules and cells Vol.19 No.1
RPK118 is a sphingosine kinase-1-binding protein that has been implicated in sphingosine 1 phosphate-mediated signaling. It contains a PX (phox homology) domain and two pseudo-kinase domains, and co-localizes with sphingosine kinase-1 on early endosomes. In this study we identified a novel RPK118-binding protein, PRDX3 (peroxiredoxin-3), by yeast two-hybrid screening. The interaction between these proteins was confirmed by pull-down assays and co-immunoprecipitation experi-ments. Deletion studies showed that RPK118 inter-acted with PRDX3 through its pseudokinase domains, and with early endosomes through its PX domain. Dou-ble immunofluorescence experiments demonstrated that PRDX3 co-localized with RPK118 on early endosomes in COS7 cells. PRDX3 is a member of the antioxidant family of proteins synthesized in the cytoplasm and functioning in mitochondria. Our findings indicate that RPK118 is a PRDX3-binding protein that may be involved in transporting PRDX3 from the cytoplasm to its mitochondrial site of function or to other mem-brane structures via endosome trafficking
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