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RISS 인기검색어
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- 저자 : Yanlin Zhu (검색결과 7 건)
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Improved HPC method for nonlinear wave tank
Zhu, Wenbo,Greco, Marilena,Shao, Yanlin The Society of Naval Architects of Korea 2017 International Journal of Naval Architecture and Oc Vol.9 No.6
The recently developed Harmonic Polynomial Cell (HPC) method has been proved to be a promising choice for solving potential-flow Boundary Value Problem (BVP). In this paper, a flux method is proposed to consistently deal with the Neumann boundary condition of the original HPC method and enhance the accuracy. Moreover, fixed mesh algorithm with free surface immersed is developed to improve the computational efficiency. Finally, a two dimensional (2D) multi-block strategy coupling boundary-fitted mesh and fixed mesh is proposed. It limits the computational costs and preserves the accuracy. A fully nonlinear 2D numerical wave tank is developed using the improved HPC method as a verification.
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Improved HPC method for nonlinear wave tank
Wenbo Zhu,Marilena Greco,Yanlin Shao 대한조선학회 2017 International Journal of Naval Architecture and Oc Vol.9 No.6
The recently developed Harmonic Polynomial Cell (HPC) method has been proved to be a promising choice for solving potential-flow Boundary Value Problem (BVP). In this paper, a flux method is proposed to consistently deal with the Neumann boundary condition of the original HPC method and enhance the accuracy. Moreover, fixed mesh algorithm with free surface immersed is developed to improve the computational efficiency. Finally, a two dimensional (2D) multi-block strategy coupling boundary-fitted mesh and fixed mesh is proposed. It limits the computational costs and preserves the accuracy. A fully nonlinear 2D numerical wave tank is developed using the improved HPC method as a verification.
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Du, Fuping,Zhu, Rui,Huang, Yanlin,Tao, Ye,Jin Seo, Hyo Royal Society of Chemistry 2011 Dalton Transactions Vol.40 No.43
<P>A red-emitting phosphor, Eu<SUP>3+</SUP>-doped Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB>, was synthesized by the conventional high-temperature solid-state reaction. X-ray powder diffraction (XRD) analyses confirmed the pure crystalline phase of Whitlockite-type structure. The excitation spectra of Eu<SUP>3+</SUP> doped Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB> were measured in the VUV and UV region indicating an efficient energy transfer process from the host and Gd<SUP>3+</SUP> to Eu<SUP>3+</SUP> ions. Upon excitation with VUV and UV radiation, the phosphor showed strong red emission around 611 nm corresponding to the forced electric dipole <SUP>5</SUP>D<SUB>0</SUB>→<SUP>7</SUP>F<SUB>2</SUB> transition of Eu<SUP>3+</SUP> ions. The VUV- and UV-excited luminescence spectra of Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB>:Eu<SUP>3+</SUP> together with the dependence of the integrated emission intensities on the doping levels were investigated. The Eu<SUP>3+</SUP> ions were investigated by a tunable laser as an excitation source. The excitation spectra of <SUP>7</SUP>F<SUB>0</SUB>→ <SUP>5</SUP>D<SUB>0</SUB> transitions suggest that there are two families of inequivalent sites for Eu<SUP>3+</SUP> in this host. The concentration quenching and crystallographic site-occupancy of Eu<SUP>3+</SUP> ions in Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB> host were discussed on the basis of the site selective excitation and emission spectra, the luminescence decay and its crystal structure.</P> <P>Graphic Abstract</P><P>Two families of the inequivalent sites for Eu<SUP>3+</SUP> ions in Ca<SUB>9</SUB>LiGd<SUB>2/3</SUB>(PO<SUB>4</SUB>)<SUB>7</SUB> with whitlockite-type structure were identified on the base of the laser site-selective excitation and emission spectra. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1dt11075f'> </P>
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Lü,, Juan,Du, Fuping,Zhu, Rui,Huang, Yanlin,Seo, Hyo Jin Royal Society of Chemistry 2011 Journal of materials chemistry Vol.21 No.41
<P>Mn<SUP>2+</SUP>-doped phosphates Na<SUB>2</SUB>CaMg<SUB>1−<I>x</I></SUB>Mn<SUB><I>x</I></SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> (<I>x</I> = 0.05–1.0) were prepared by conventional solid-state reaction. X-ray powder diffraction (XRD), the emission and excitation spectra, and decay measurements were employed to characterize the synthesized phosphors. The XRD patterns show that Na<SUB>2</SUB>CaMg<SUB>1−<I>x</I></SUB>Mn<SUB><I>x</I></SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> (<I>x</I> = 0.05–0.3) forms the single low temperature monoclinic phase α-Na<SUB>2</SUB>CaMg(PO<SUB>4</SUB>)<SUB>2</SUB> with the crystal group of <I>P</I>2<SUB>1</SUB>/<I>c</I> (No.14). The heavily Mn<SUP>2+</SUP>-doped Na<SUB>2</SUB>CaMg<SUB>1−<I>x</I></SUB>Mn<SUB><I>x</I></SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> (<I>x</I> = 0.6–1.0) crystallizes in the single high-temperature trigonal phase of β-Na<SUB>2</SUB>CaMg(PO<SUB>4</SUB>)<SUB>2</SUB> with space-group <I>P</I>3̄<I>m</I>1 (No. 164). The members with <I>x</I> = 0.3–0.5 form a series of solid solutions containing two distinct phases, α- and β-Na<SUB>2</SUB>CaMg(PO<SUB>4</SUB>)<SUB>2</SUB>. The dependence of luminescence spectra on the Mn<SUP>2+</SUP>-doping concentration in Na<SUB>2</SUB>CaMg<SUB>1−<I>x</I></SUB>Mn<SUB><I>x</I></SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> (<I>x</I> = 0.05–1.0) was investigated. The great red-shift of Mn<SUP>2+</SUP> emission with increasing Mn<SUP>2+</SUP>-concentration in Na<SUB>2</SUB>CaMg(PO<SUB>4</SUB>)<SUB>2</SUB> were observed. The results are discussed in relation with the detailed crystal structure and the spectral analyses. The CIE coordinates and the luminescence decay (lifetimes) of Mn<SUP>2+</SUP> ions were discussed in order to further investigate the potential applications.</P> <P>Graphic Abstract</P><P>Na<SUB>2</SUB>CaMg<SUB>1−<I>x</I></SUB>Mn<SUB><I>x</I></SUB>(PO<SUB>4</SUB>)<SUB>2</SUB> demonstrates the low-temperature monoclinic α-phase to the high-temperature trigonal β-phase transition and the red-shift of luminescence wavelength with increasing Mn<SUP>2+</SUP>-doping (<I>x</I> = 0.05–1.0). <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c1jm12854j'> </P>
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A DC Transformer Based on MMC and Full-Bridge Structure with Control Method
Sheng Cheng,Shuhuai Shi,Fang Zhuo,Feng Wang,Yanlin Zhu,Nan Zhang 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
With the deterioration of environmental problems and the shortage of fossil energy, DC distribution net with convenient access to distributed energy has a bright prospect. To connect DC buses with different voltage level, DC/DC converter becomes the focus of research. This paper focuses on the modulation strategy of dc-dc converter based on the modular multilevel converter (MMC) and Full-bridge, which is suitable for medium-low voltage and high-power transmission. On this structure, a quasi-square wave modulation strategy with voltage conversion ability is adopted to improve the performance of the dc-dc converter. This modulation strategy can flexibly alter the AC voltage peak value and limit the dv/dt on the edge of square wave. Simulation results in MATLAB/Simulink verified the proposed modulation strategy.
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