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Luminescence properties of novel Ce^3+, Mn^2+ doped NaSr_4(BO_3)_3 phosphors
Xinmin Zhang,Xuebin Qiao,서효진 한국물리학회 2011 Current Applied Physics Vol.11 No.3
A new borate compound NaSr_4(BO_3)_3 doped with Ce^3+, Mn^2+ was prepared by a solid-state reaction at high temperature. The photoluminescence (PL) excitation and emission spectra, low temperature emission spectra and decay curves of Ce^3+, Mn^2+ in NaSr_4(BO_3)_3 were studied. The PL properties of Ce^3+, Mn^2+ co-doped NaSr_4(BO_3)_3 were also investigated. NaSr_4(BO_3)_3:Ce^3+, Mn^2+ phosphors emit two distinctive colors: a blue band centered at 435 nm originating from Ce^3+ and a red band at 660 nm caused by Mn^2+. The results indicate that there exist energy transfer from Ce^3+ to Mn^2+ in the NaSr_4(BO_3)_3 doped with Ce^3+, Mn^2+ system.
Luminescence enhancement by energy transfer from Ce3+ ions in Ba1.6Ca0.4P2O7:Ce3+:Tb3+ phosphor
Xinmin Zhang,Wen-lan Li,장경혁,서효진 한국물리학회 2012 Current Applied Physics Vol.12 No.1
The optical properties of Ba1.6Ca0.4P2O7 doped with Ce3+ and Tb3+ are investigated. Under excitation at 280 nm the emission spectrum of Ba1.6Ca0.4P2O7:Ce3+ consists of a peak at 370 nm and a shoulder at the longer wavelength side. The emission spectra of Ba1.6Ca0.4P2O7:Tb3+ shows the well-known emission lines due to 5D4-7FJ transitions of Tb3+. The green emissions of Tb3+ ions are enhanced upon UV excitation through energy transfer from Ce3+ to Tb3+ ions. The efficiency of such an energy transfer is estimated based on spectroscopic data. The dependence of photoluminescence (PL) intensities of Ce3+ and Tb3+ emissions on Ce3+ or Tb3+ concentrations in the systems (Ba1.6Ca0.4P2O7:0.04Ce3+,xTb3+ and Ba1.6Ca0.4P2O7:xCe3+,0.04Tb3+) and the temperature dependence of PL emission spectra of Ba1.6Ca0.4P2O7:0.06Ce3+,0.04Tb3+ is also investigated.
Sensitivity Analysis of Generalized Gaussian Process Models for Variable Importance Measure
Xinmin Zhang,Manabu Kano,Yuan Li 제어로봇시스템학회 2019 제어로봇시스템학회 국제학술대회 논문집 Vol.2019 No.10
In machine learning, Gaussian process regression (GPR) has been gaining popularity due to its nonparametric Bayesian form. However, the traditional GPR model is designed for continuous real-valued outputs with a Gaussian assumption, which does not hold in some engineering application studies. For example, when the output variable is count data, it violates the assumptions of the GPR model. Generalized Gaussian process regression (GGPR) can overcome the drawbacks of the conventional GPR, and it allows the model outputs to be any member of the exponential family of distributions. Thus, GGPR is more flexible than GPR. However, since GGPR is a nonlinear kernel-based method, it is not readily accessible to understand the effect of each input variable on the model output. To tackle this issue, the sensitivity analysis of GGPR (SA-GGPR) is proposed in this work. SA-GGPR aims to identify factors that exert higher influence on the model output by utilizing the information from the partial derivative of the GGPR model output with respect to its inputs. The proposed method was applied to a nonlinear count data system. The application results demonstrated that the proposed SA-GGPR is superior to the PLS-Beta, PLS-VIP, and SA-GPR methods in identification accuracy.
Magnetic and Thermal Analysis of a Water-cooled Permanent Magnet Linear Synchronous Motor
Zhang, Xinmin,Lu, Qinfen,Cheng, Chuanying,Ye, Yunyue Journal of International Conference on Electrical 2012 Journal of international Conference on Electrical Vol.1 No.4
The water-cooled Permanent Magnet Linear Synchronous Motor (PMLSM) has a wide range of applications due to high efficiency, high thrust force density and high acceleration. In order to ensure normal operation and maximum output, both the magnetic and thermal performance are vital to be considered. Based on ANSYS software, electromagnetic and thermal finite-element analysis (FEA) models of a 14-pole, 12-slot water-cooled PMLSM are erected adopting suitable assumptions. Firstly, the thrust force and force ripple with different current densities are calculated. Secondly, the influence of different water flow on the motor heat dissipation and force performance under different operationional conditions are investigated and optimized. Furthermore, for continuous operation, the temperature rise and thrust feature are studied under the rated load 8A, the proper temperature $120^{\circ}C$ and the limited temperature $155^{\circ}C$. Likewise, for short-time operation, the maximum duration is calculated when applied with a certain large current. Similarly, for intermittent operation, load time as well as standstill time are determined with the optimal current to achieve better thrust performance.
Tong, Xubo,Zhang, Xinmin,Wu, Luyi,Zhang, Hongzhi,Seo, Hyo Jin Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.748 No.-
<P><B>Abstract</B></P> <P>Ce<SUP>3+</SUP>, Tb<SUP>3+</SUP> co-doped T-phase orthosilicate Ba<SUB>1.2</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> phosphors were prepared by means of solid state reactions. The synthesized samples were investigated using XRD and PL emission and excitation spectra. The emission spectra for Ce<SUP>3+</SUP> doped Ba<SUB>1.2</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> phosphors show broad bands in the 320–550 nm spectral region. The excitation spectra exhibit several absorption peaks in the range of 250–400 nm. Both the emission and excitation spectra are dependent on the excitation or monitoring wavelengths. We attribute these results to Ce<SUP>3+</SUP> ions occupying two different crystallographic sites (i.e., Ce I and Ce II). The Ce<SUP>3+</SUP>, Tb<SUP>3+</SUP> co-doped Ba<SUB>1.2</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> phosphors show Tb<SUP>3+</SUP>-related line emissions in the 475–600 nm spectral region and Ce<SUP>3+</SUP>-related band emissions in the 350–525 nm spectral region when the 4<I>f</I> → 5d transition of Ce<SUP>3+</SUP> is excited (λ<SUB>ex</SUB> = 345 nm), indicating that energy transfer from Ce<SUP>3+</SUP> to Tb<SUP>3+</SUP> takes place. Moreover, the emission intensity of <SUP>5</SUP>D<SUB>4</SUB> → <SUP>7</SUP>F<SUB>5</SUB> transition for Ba<SUB>1.00</SUB>Ce<SUB>0.02</SUB>Tb<SUB>0.08</SUB>Li<SUB>0.10</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> is 30 times stronger than that of Ba<SUB>1.04</SUB>Tb<SUB>0.08</SUB>Li<SUB>0.08</SUB>Ca<SUB>0.8</SUB>SiO<SUB>4</SUB> sample under 345-nm UV excitation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PL spectra are dependent on excitation or monitoring wavelengths. </LI> <LI> Ce<SUP>3+</SUP> ions occupy two different crystallographic sites (i.e., Ce I and Ce II). </LI> <LI> Efficient energy transfer from Ce<SUP>3+</SUP> to Tb<SUP>3+</SUP> takes place. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>