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Surface Mesh Generation in Parametric Space Using a Riemannian Surface Definition
Cui Dai,Zhaoxue Wang,Liang Dong,Yiping Chen,Junfeng Qiu 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.2
In order to solve the problem of generating distortion elements in the mapping from parameter space to real space, and the boundary coincidence of the mesh generated by the software quality, an approach for parametric surface mesh generation based on Riemannian metric, combined with Delaunay triangulation and AFT is proposed. In our algorithm, the boundary curves are discretized based on the proximity and curvature of the curves in the model after derivation the correlation of curve length between parametric space and real space. Background meshes of parametric space were generated by using improved AFT, and could improve the efficient of the algorithm and control element sizing and metric values. When background mesh of parametric space were refined, to counteract mapping distortion, the traditional Delaunay incremental insertion kernel is replaced by inserting the center of triangle circumscribed ellipse, and the algorithm for locating ellipse center and judging whether nodes within ellipse. In this paper, the details of the surface mesh generated by the algorithm are introduced in detail. The algorithm proposed in this paper has the characteristics of reliable algorithm, high mesh generation efficiency and mesh quality. Finally, the reliability of the proposed algorithm is verified by an example of surface mesh generation.
A SERIES OF MONODISPERSE SILVER NANOPARTICLES BY A ONE-POT SYNTHESIS
LUPING TANG,Huichao Zhang,Yiping Cui,Jiayu Zhang,YONGHONG YE,SHENFEI ZONG 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2014 NANO Vol.9 No.1
A series of monodisperse Ag nanoparticles (Ag NPs), whose size can be tuned between 2 nm and34 nm, have been successfully synthesized in one pot by controlling the growth time. The stan-dard deviation of the small-size Ag NPs is 12% while that of the large-size ones is 15%. During thesynthesis process, sodium borohydride and sodium dodecyl sulfate were used as reducing agentand surfactant, respectively, and the e®ect of the synthesis parameters on the size-tuning rangeand the size distribution of Ag NPs was studied to get the optimum growth condition. Moreover,surface enhanced Raman scattering (SERS) spectra were analyzed to explore the synthesismechanism of Ag NPs
Xiong Zhang,Shuchang Wang,Hongquan Yang,Yiping Cui 대한금속·재료학회 2015 ELECTRONIC MATERIALS LETTERS Vol.11 No.4
AlxGa1-xN (0.15 ≤ x ≤ 0.87) epilayers were grown on sapphire substrates by metal-organic chemical vapor deposition (MOCVD). The lattice deformation, chemical bonding states, and local electronic structure were characterized by a series of techniques, including X-ray diffraction (XRD), Raman scattering, X-ray photoelectron (XPS), and extended Xray absorption fine structure (EXAFS) spectroscopy. The XRD and Raman spectra revealed that substitution of Ga with Al in AlxGa1-xN epilayers induces a significant contraction in the crystal lattice and a slight expansion of internal parameter u. The XPS measurements indicated the absence of remarkable disorder of the chemical bonds in AlGaN with a high Al content. The EXAFS analysis also demonstrated that the Ga-N and Ga-Al bond lengths are independent of the Al content, whereas the Ga-Ga bond length varies with Al content.
Temperature-Dependent Photovoltaic Characterization of a CdTe/CdSe Nanocrystal’s Solar Cell
Huichao Zhang,Zhengyang Li,Jun Qian,Qiumei Guan,Xiaowei Du,Yiping Cui,Jiayu Zhang 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.2
An all-inorganic thin film solar cell was fabricated with colloidal CdTe and CdSe nanocrystals. Its temperaturedependent photovoltaic characterization was measured, and an open circuit voltage decay technique was used to determine the electron lifetime. The photovoltaic parameters, such as the exact carrier lifetime, were remarkably different between under low-temperature region and under temperature above 267 K. It is suggested that the temperature-dependent carrier conductivity results from a thermally-activated hopping process and this nanocrystals device is a kind of donor-acceptor solar cell.