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Data point selection for weighted least square fitting of cavity decay time constant 被引量:1
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作者 何星 晏虎 +2 位作者 董理治 杨平 许冰 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第1期640-646,共7页
For the accurate extraction of cavity decay time, a selection of data points is supplemented to the weighted least square method. We derive the expected precision, accuracy and computation cost of this improved method... For the accurate extraction of cavity decay time, a selection of data points is supplemented to the weighted least square method. We derive the expected precision, accuracy and computation cost of this improved method, and examine these performances by simulation. By comparing this method with the nonlinear least square fitting (NLSF) method and the linear regression of the sum (LRS) method in derivations and simulations, we find that this method can achieve the same or even better precision, comparable accuracy, and lower computation cost. We test this method by experimental decay signals. The results are in agreement with the ones obtained from the nonlinear least square fitting method. 展开更多
关键词 cavity ring-down decay time extraction weighted least square method data point selection
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The effect of k-cubic Dresselhaus spin orbit coupling on the decay time of persistent spin helix states in semiconductor two-dimensional electron gases
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作者 柴政 胡茂金 +1 位作者 王瑞强 胡梁宾 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第2期437-442,共6页
We study the theoretical effect of k-cubic (i.e, cubic-in-momentum) Dresselhaus spin-orbit coupling on the decay time of persistent spin helix states in semiconductor two-dimensional electron gases. We show that the... We study the theoretical effect of k-cubic (i.e, cubic-in-momentum) Dresselhaus spin-orbit coupling on the decay time of persistent spin helix states in semiconductor two-dimensional electron gases. We show that the decay time of persistent spin helix states may be suppressed substantially by k-cubic Dresselhaus spin-orbit coupling, and after taking the effect of k-cubic Dresselhaus spin-orbit interaction into account, the theoretical results obtained accord both qualitatively and quantitatively with other recent experimental results. 展开更多
关键词 persistent spin helix state Rashba spin-orbit coupling k-cubic Dresselhaus spin-orbit coupling decay time
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LiYF_(4):Yb/LiYF_(4) and LiYF_(4):Yb,Er/LiYF_(4) core/shell nanocrystals with luminescence decay times similar to YLF laser crystals and the upconversion quantum yield of the Yb,Er doped nanocrystals 被引量:1
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作者 Frederike Carl Leonie Birk +4 位作者 Bettina Grauel Monica Pons Christian Würth Ute Resch-Genger Markus Haase 《Nano Research》 SCIE EI CAS CSCD 2021年第3期797-806,共10页
We developed a procedure to prepare luminescent LiYF_(4):Yb/LiYF_(4) and LiYF_(4):Yb,Er/LiYF_(4) core/shell nanocrystals with a size of approximately 40 nm revealing luminescence decay times of the dopant ions that ap... We developed a procedure to prepare luminescent LiYF_(4):Yb/LiYF_(4) and LiYF_(4):Yb,Er/LiYF_(4) core/shell nanocrystals with a size of approximately 40 nm revealing luminescence decay times of the dopant ions that approach those of high-quality laser crystals of LiYF_(4):Yb(Yb:YLF)and LiYF_(4):Yb,Er(Yb,Er:YLF)with identical doping concentrations.As the luminescence decay times of Yb^(3+)and Er^(3+)are known to be very sensitive to the presence of quenchers,the long decay times of the core/shell nanocrystals indicate a very low number of defects in the core particles and at the core/shell interfaces.This improvement in the performance was achieved by introducing two important modifications in the commonly used oleic acid based synthesis.First,the shell was prepared via a newly developed method characterized by a very low nucleation rate for particles of pure LiYF_(4) shell material.Second,anhydrous acetates were used as precursors and additional drying steps were applied to reduce the incorporation of OH−in the crystal lattice,known to quench the emission of Yb^(3+)ions.Excitation power density(P)-dependent absolute measurements of the upconversion luminescence quantum yield(ΦUC)of LiYF_(4):Yb,Er/LiYF_(4) core/shell particles reveal a maximum value of 1.25%at P of 180 W·cm^(−2).Although lower than the values reported for NaYF4:18%Yb,2%Er core/shell nanocrystals with comparable sizes,theseΦUC values are the highest reported so far for LiYF_(4):18%Yb,2%Er/LiYF_(4) nanocrystals without additional dopants.Further improvements may nevertheless be possible by optimizing the dopant concentrations in the LiYF_(4) nanocrystals. 展开更多
关键词 nanocrystal decay time LUMINESCENCE LiYF_(4) quantum yield UPCONVERSION
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Synthesis and luminescence properties of novel Ce^3+-doped Yb3Al5-xGaxO12 garnets with very fast decay time 被引量:1
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作者 Ru Li Jie Yin +3 位作者 Fei Du Peng Zhang Shangke Pan Jianguo Pan 《Journal of Rare Earths》 SCIE EI CAS CSCD 2018年第8期806-810,共5页
A novel series of Ce^3+-doped Yb3 Al(5-x)GaxO(12)(x = 0, 1,2, 3,4, 5) powders of ytterbium aluminum gallium garnets were synthesized by high temperature solid-state reaction in a carbon reducing atmosphere. The... A novel series of Ce^3+-doped Yb3 Al(5-x)GaxO(12)(x = 0, 1,2, 3,4, 5) powders of ytterbium aluminum gallium garnets were synthesized by high temperature solid-state reaction in a carbon reducing atmosphere. The ytterbium aluminum garnets were characterized by X-ray powder diffraction, UV-Vis diffuse reflectance spectra, photoluminescence spectra and decay curves. Moreover, the substitution effect for the Al^3+ sites with Ga^3+ in 0.5 at%Ce:Yb3 Al(5-x)GaxO(12)(x = 0,1, 2, 3, 4, 5) garnets were discussed. With the increase of Ga^3+ ion concentration, the visible absorption peaks within 400-450 nm have blue shift phenomenon,while the absorption peaks in the range of 330-350 nm and the absorption band edge red shifts.Furthermore, the short decay times are very short with less than 10 ns due to the Yb^3+ + Ce^3+→ Yb^2+ + Ce^4+ electron transfer reaction. 展开更多
关键词 Ytterbium aluminum gallium garnets High temperature solid-state reaction PHOTOLUMINESCENCE decay time Rare earths
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Improvements in Inversion of Magnetic Resonance Exploration-Water Content, Decay Time, and Resistivity 被引量:1
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作者 Ugur Yaramanci Mike Müller-Petke 《Journal of China University of Geosciences》 SCIE CSCD 2009年第3期592-605,共14页
In this review article, we present recent developments and improvements in magnetic resonance sounding (MRS), a newly established geophysical exploration method that provides unique information about hydrogeophysica... In this review article, we present recent developments and improvements in magnetic resonance sounding (MRS), a newly established geophysical exploration method that provides unique information about hydrogeophysical properties due to its direct sensitivity to hydrogen protons and proton dynamics. Starting with the most sophisticated and complete MRS formulation, we give a detailed view on how to solve the equation, i.e., inverting exactly for all model parameters: water content, decay time, and resistivity. Giving a short review of general inversion schemes used in geophysics, the special properties of MRS inversion are evaluated and the development of MRS inversion over recent years is shown. We present the extension of MRS to magnetic resonance tomography (MRT), i.e., the extension to two-dimensional investigations and appropriate inversions. Finally, we address restrictions, limitations, and inconsistencies as well as future developments. 展开更多
关键词 magnetic resonance sounding (MRS) magnetic resonance tomography (MRT) INVERSION MODELING water content decay time resistivity.
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A novel non-iterative shape method for estimating the decay time constant of the finger photoplethysmographic pulse 被引量:1
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作者 Ling-xiao HOU Ming WEI +3 位作者 Xuan WANG Xin-zhong CHEN Ying FENG Kai JIANG 《Journal of Zhejiang University-Science A(Applied Physics & Engineering)》 SCIE EI CAS CSCD 2011年第6期438-445,共8页
The photoplethysmogram(PPG) of a pulse wave,similar in appearance to the arterial blood pressure(ABP) waveform,contains rich information about the cardiovascular system.The decay time constant RC,equal to the product ... The photoplethysmogram(PPG) of a pulse wave,similar in appearance to the arterial blood pressure(ABP) waveform,contains rich information about the cardiovascular system.The decay time constant RC,equal to the product of peripheral resistance R and total arterial compliance C,is a meaningful cardiovascular model parameter in vascular assessment.Using or ameliorating the existing ABP methods does not achieve a satisfactory estimation of RC from the PPG volume pulse(VRC).Thus,a novel non-iterative shape method(NSM) of evaluating VRC is introduced in this paper.The mathematic expression between a novel,readily available morphological parameter called the area difference ratio(ADR) and VRC was established.As it was difficult to calculate VRC from the complicated expression analytically,we recommend estimating it using a piecewise linear interpolation criterion.Also,since the effect of the PPG magnitude is eliminated in the calculation of ADR,precaliberation or normalization is dispensable in the NSM.Results of human experiments indicated that the NSM was computationally efficient,and the simulation experiments confirmed that the NSM was theoretically available for ABP. 展开更多
关键词 Photoplethysmogram(PPG) decay time constant Non-iterative shape method(NSM) Area difference ratio(ADR)
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TIME DECAY RATE OF SOLUTIONS TO THE HYPERBOLIC MHD EQUATIONS IN R3 被引量:1
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作者 李蓓 朱红锦 赵才地 《Acta Mathematica Scientia》 SCIE CSCD 2016年第5期1369-1382,共14页
In this paper, we first show the global existence, uniqueness and regularity of weak solutions for the hyperbolic magnetohydrodynamics(MHD) equations in R^3. Then we establish that the solutions with initial data belo... In this paper, we first show the global existence, uniqueness and regularity of weak solutions for the hyperbolic magnetohydrodynamics(MHD) equations in R^3. Then we establish that the solutions with initial data belonging to H^m(R^3) ∩ L^1(R^3) have the following time decay rate:║▽~mu(x, t) ║~2+║ ▽~mb(x, t)║~ 2+ ║▽^(m+1)u(x, t)║~ 2+ ║▽^(m+1)b(x, t) ║~2≤ c(1 + t)^(-3/2-m)for large t, where m = 0, 1. 展开更多
关键词 hyperbolic MHD equations weak solution time decay rate
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Gevrey Regularity and Time Decay of Fractional Porous Medium Equation in Critical Besov Spaces
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作者 Weiliang Xiao Yu Zhang 《Journal of Applied Mathematics and Physics》 2022年第1期91-111,共21页
In this paper, we show the existence and regularity of mild solutions depending on the small initial data in Besov spaces to the fractional porous medium equation. When 1 < <em>α</em> ≤ 2, we prove gl... In this paper, we show the existence and regularity of mild solutions depending on the small initial data in Besov spaces to the fractional porous medium equation. When 1 < <em>α</em> ≤ 2, we prove global well-posedness for initial data <img src="Edit_b7b43d4c-00d8-49d6-9066-97151fb5c337.bmp" alt="" /> with 1 ≤ <em>p</em> < ∞, 1 ≤ <em>q</em> ≤ ∞, and analyticity of solutions with 1 < <em>p</em> < ∞, 1 ≤ <em>q</em> ≤ ∞. In particular, we also proved that when <em>α</em> = 1, both <em>u</em> and <img src="Edit_a5af0853-8adc-4a08-b8a2-b9a70ea0f409.bmp" alt="" /> belong to <img src="Edit_03a932cc-aa58-4568-83ad-f16416cc7b71.bmp" alt="" />. We solve this equation through the contraction mapping method based on Littlewood-Paley theory and Fourier multiplier. Furthermore, we can get time decay estimates of global solutions in Besov spaces, which is <img src="Edit_083986e9-4e1c-4494-ac5d-a7d30a12df97.bmp" alt="" /> as <em>t</em> → ∞. 展开更多
关键词 WELL-POSEDNESS Gevrey Regularity time decay Besov Spaces
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Influence of the Magnetic Field on the Transient Decay of the Density of Charge Carriers in a Silicon Photocell with Vertical Multijunctions Connected in Series Placed in Open Circuit
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作者 Papa Monzon Alassane Samake Papa Touty Traore +3 位作者 Babou Dione Pape Diop Fatimata Ba Mamadou Wade 《Energy and Power Engineering》 CAS 2022年第12期747-761,共15页
This study investigates the effect of the magnetic field on the transient density of excess minority charge carriers in the base of a series-connected vertical junction silicon solar cell. The solar cell is presented ... This study investigates the effect of the magnetic field on the transient density of excess minority charge carriers in the base of a series-connected vertical junction silicon solar cell. The solar cell is presented in open circuit transient operation. The magnetic field through the Laplace force which deflects the photogenerated carriers from their initial trajectory towards the lateral surfaces reducing their mobility, diffusion and conduction, will certainly influence the decay time of the transient regime. The transient density of excess minority carriers in the base is a sum of infinite terms whose decay time of the different harmonics is studied. 展开更多
关键词 Silicon Solar Cell-Series Vertical Junction Recombination Velocities Magnetic Field Base Thickness (P) EIGENVALUES decay time Constant
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THE GLOBAL EXISTENCE AND A DECAY ESTIMATE OF SOLUTIONS TO THE PHAN-THEIN-TANNER MODEL
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作者 Ruiying WEI Yin LI Zheng-an YAO 《Acta Mathematica Scientia》 SCIE CSCD 2022年第3期1058-1080,共23页
In this paper,we study the global existence and decay rates of strong solutions to the three dimensional compressible Phan-Thein-Tanner model.By a refined energy method,we prove the global existence under the assumpti... In this paper,we study the global existence and decay rates of strong solutions to the three dimensional compressible Phan-Thein-Tanner model.By a refined energy method,we prove the global existence under the assumption that the H^(3) norm of the initial data is small,but that the higher order derivatives can be large.If the initial data belong to homogeneous Sobolev spaces or homogeneous Besov spaces,we obtain the time decay rates of the solution and its higher order spatial derivatives.Moreover,we also obtain the usual L^(p)-L^(2)(1≤p≤2)type of the decay rate without requiring that the Lpnorm of initial data is small. 展开更多
关键词 Phan-Thein-Tanner model global existence time decay rates
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TIME PERIODIC SOLUTIONS OF NON-ISENTROPIC COMPRESSIBLE MAGNETOHYDRODYNAMIC SYSTEM
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作者 许秋菊 蔡虹 谭忠 《Acta Mathematica Scientia》 SCIE CSCD 2015年第1期216-234,共19页
In this paper, we study the non-isentropic compressible magnetohydrodynamic system with a time periodic external force in R^n. Under the condition that the optimal time decay rates are obtained by spectral analysis, w... In this paper, we study the non-isentropic compressible magnetohydrodynamic system with a time periodic external force in R^n. Under the condition that the optimal time decay rates are obtained by spectral analysis, we show that the existence, uniqueness and time-asymptotic stability of time periodic solutions when the space dimension n 〉 5. Our proof is based on a combination of the energy method and the contraction mapping theorem. 展开更多
关键词 non-isentropic compressible magnetohydrodynamic system time periodic solution optimal time decay rates energy estimates
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Global Existence and Decay of Solution to Parabolic-Parabolic Keller-Segel Model in R^(d)
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作者 ZHONG Wenbin LIU Xiaofeng 《Journal of Donghua University(English Edition)》 CAS 2022年第1期85-94,共10页
We consider the global existence and decay of integral solutions to the parabolic-parabolic Keller-Segel system in d-dimension.On the one hand,by Banach fixed point theorem and some properties of heat kernel,we prove ... We consider the global existence and decay of integral solutions to the parabolic-parabolic Keller-Segel system in d-dimension.On the one hand,by Banach fixed point theorem and some properties of heat kernel,we prove the local existence and the global existence of integral solutions for the different initial data under some conditions that involve the size of the initial data.On the other hand,in the case of global solutions,we obtain their optimal time decay by Gronwall’s lemma. 展开更多
关键词 Keller-Segel system global existence integral solution local existence optimal time decay rate
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Time Decay Rate of Solutions Toward the Viscous Shock Waves under Periodic Perturbations for the Scalar Conservation Law with Nonlinear Viscosity
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作者 Ye-chi LIU 《Acta Mathematicae Applicatae Sinica》 SCIE CSCD 2023年第1期28-48,共21页
In this paper,it is proved that the weak solution to the Cauchy problem for the scalar viscous conservation law,with nonlinear viscosity,different far field states and periodic perturbations,not only exists globally i... In this paper,it is proved that the weak solution to the Cauchy problem for the scalar viscous conservation law,with nonlinear viscosity,different far field states and periodic perturbations,not only exists globally in time,but also converges towards the viscous shock wave of the corresponding Riemann problem as time goes to infinity.Furthermore,the decay rate is shown.The proof is given by a technical energy method. 展开更多
关键词 viscous conservation law asymptotic behavior time decay rate viscous shock wave periodic perturbation
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Enhancement of GABA_A Receptor-Mediated Inhibitory Postsynaptic Currents Induced by "Partial Oxygen-Glucose Deprivation" 被引量:2
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作者 李红斌 韩会丽 +2 位作者 马文裴 董志芳 徐林 《Zoological Research》 CAS CSCD 北大核心 2007年第5期491-496,共6页
Oxygen/glucose deprivation (OGD) has been widely used as an in vitro model of focal ischemia, where the blood flow is severely reduced and neurons rapidly die. However, adjacent to the focal region is ‘penumbra', ... Oxygen/glucose deprivation (OGD) has been widely used as an in vitro model of focal ischemia, where the blood flow is severely reduced and neurons rapidly die. However, adjacent to the focal region is ‘penumbra', where residual blood flow remains oxygen and glucose supplies are at low levels. To model this pathological genesis, we developed a partial OGD (pOGD) protocol in a rat brain slice. This model met two requirements: oxygen was partially deprived and glucose was reduced in the perfusion buffer. Therefore we investigated the effect of pOGD on gama-aminobutyric acid (GABAA) receptor-mediated inhibitory postsynaptic currents (IPSCs) in CA1 neurons of a hippocampal slice through whole-cell patch-clamp technique. We found that the amplitude and decay time of IPSCs were increased immediately during pOGD treatment. And the enhancement of IPSCs amplitude resulted from an increase of the synaptic conductance without a significant change in the reversal potential of chloride. These results suggested that the nervous system could increase inhibitory neurotransmission to offset excitation by homeostasis mechanisms during the partial oxygen and glucose attack. 展开更多
关键词 Partial oxygen-glucose deprivation (pOGD) GABAA receptor IPSCS AMPLITUDE decay time
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Synthesis and Analysis of Tm^(3+) Doped YF_3 Upconversion Luminescent Nano-materials 被引量:1
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作者 HUANG Qing-Ming 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2010年第7期993-1000,共8页
Upconversion (UC) phosphor Tm3+ doped YF3 nano-erystals were prepared by hydrothermal method under different conditions and characterized by Field Transmission electron microscopy (TEM), Scanning electron microsc... Upconversion (UC) phosphor Tm3+ doped YF3 nano-erystals were prepared by hydrothermal method under different conditions and characterized by Field Transmission electron microscopy (TEM), Scanning electron microscopy (SEM) and X-ray diffraction (XRD). Their UC luminescence properties were studied by fluorescence spectrophotometer with 980 nm diode laser excitation, and impact of different grain sizes and morphology on the UC luminescence intensity was discussed. The fluorescence decay lifetime was calculated by Multi-exponential function fitting method. Results show that UC emission intensity was enhanced with the reduction of grain size, and the decay lifetime is 0.60 us. 展开更多
关键词 UPCONVERSION crystal morphology decay time Rietveld refinement
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Temperature dependence of the luminescence properties of LaCl3:Ce crystal
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作者 裴钰 陈晓峰 +2 位作者 秦来顺 姚冬敏 任国浩 《Chinese Physics B》 SCIE EI CAS CSCD 2006年第11期2756-2760,共5页
The optical properties of LaCl3:Ce crystal are reported in this paper. Optical transmission spectrum, photoluminescence and time resolved photoluminescence spectra at different temperatures are investigated. It is fo... The optical properties of LaCl3:Ce crystal are reported in this paper. Optical transmission spectrum, photoluminescence and time resolved photoluminescence spectra at different temperatures are investigated. It is found that optical transmittance is as high as 80% between 320 nm and 600 nm, and no obvious absorption band is found in this region. Emission intensity and decay time of photoluminescence are quite stable with the change of the temperature between 80 K and 500 K. No thermal quenching is present up to 500 K, and decay time keeps at 17±2 ns. With the increase of the temperature, the whole emission bands and excitation bands present broadening and overlapping, leading to the strengthening of re-absorption of the Ce^3+ emission, which makes the emission spectra have a red shift trend. 展开更多
关键词 LACL3 scintillator TRANSMITTANCE PHOTOLUMINESCENCE decay time temperature dependence
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Influence of Si^(4+) substitution on the temperature-dependent characteristics of Y_3Al_5O_(12):Ce
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作者 徐生艳 张晓松 +2 位作者 周永亮 奚群 李岚 《Chinese Physics B》 SCIE EI CAS CSCD 2011年第3期450-454,共5页
A series of aAl5O12:Ce (YAG:Ce) phosphors doped with different Si4+ concentrations is prepared by solid-state reaction. The temperature dependent characteristics of luminescent spectrum and decay time of Ce3+ ar... A series of aAl5O12:Ce (YAG:Ce) phosphors doped with different Si4+ concentrations is prepared by solid-state reaction. The temperature dependent characteristics of luminescent spectrum and decay time of Ce3+ are investigated. With Si4+ doped, the emission spectrum shows a blue shift clue to a decrease of the splitting of 5d levels of Ce3+ ion. The thermal stability is greatly improved by adding Si4+ because the activation energy AE increases from 0.1836 eV to 0.2401 eV. The study of the decay times against temperature for various doping concentrations of Si4+ shows that the calculated nonradiative decay rate is affected by Si4+ substitution. The results are explained by the configurational coordinate diagram. 展开更多
关键词 PHOSPHOR LUMINESCENCE temperature dependence decay time
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COMPRESSIBLE NAVIER-STOKES-POISSON EQUATIONS 被引量:3
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作者 肖玲 李海梁 《Acta Mathematica Scientia》 SCIE CSCD 2010年第6期1937-1948,共12页
This is a survey paper on the study of compressible Navier-Stokes-Poisson equations. The emphasis is on the long time behavior of global solutions to multi-dimensional compressible Navier-Stokes-Poisson equations, and... This is a survey paper on the study of compressible Navier-Stokes-Poisson equations. The emphasis is on the long time behavior of global solutions to multi-dimensional compressible Navier-Stokes-Poisson equations, and the optimal decay rates for both unipolar and bipolar compressible Navier-Stokes-Poisson equations are discussed. 展开更多
关键词 Navier-Stokes-Poisson system optimal time decay rates
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COMPRESSIBLE NON-ISENTROPIC BIPOLAR NAVIER-STOKES-POISSON SYSTEM IN R^3 被引量:1
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作者 肖玲 李海梁 +1 位作者 杨彤 邹晨 《Acta Mathematica Scientia》 SCIE CSCD 2011年第6期2169-2194,共26页
The compressible non-isentropic bipolar Navier-Stokes-Poisson (BNSP) sys- tem is investigated in R3 in the present paper, and the optimal time decay rates of global strong solution are shown. For initial data being ... The compressible non-isentropic bipolar Navier-Stokes-Poisson (BNSP) sys- tem is investigated in R3 in the present paper, and the optimal time decay rates of global strong solution are shown. For initial data being a perturbation of equilibrium state in Hl(R3) (R3) for 1 〉 4 and s E (0, 1], it is shown that the density and temperature for each charged particle (like electron or ion) decay at the same optimal rate (1 + t)-3/4, but the momentum for each particle decays at the optimal rate (1 + t)-1/4-3/2 which is slower than the rate (1 + t)-3/4-3/2 for the compressible Navier-Stokes (NS) equations [19] for same initial data. However, the total momentum tends to the constant state at the rate (1 +t)-3/4 as well, due to the interplay interaction of charge particles which counteracts the influence of electric field. 展开更多
关键词 Non-isentropic bipolar Navier-Stokes Poisson system optimal time decay rate
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THE VLASOV-MAXWELL-FOKKER-PLANCK SYSTEM WITH RELATIVISTIC TRANSPORT IN THE WHOLE SPACE
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作者 杨东成 《Acta Mathematica Scientia》 SCIE CSCD 2017年第5期1237-1261,共25页
In this paper, we consider the Vlasov-Maxwell-Fokker-Planck system with relativistic transport in the whole space. The global solutions to this system near the relativistic Maxwellian are constructed and the optimal t... In this paper, we consider the Vlasov-Maxwell-Fokker-Planck system with relativistic transport in the whole space. The global solutions to this system near the relativistic Maxwellian are constructed and the optimal time decay rate of global solutions are also obtained by an approach by combining the compensating function and energy method. 展开更多
关键词 relativistic Vlasov-Maxwell-Fokker-Planck system compensating function global solutions optimal time decay rate
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