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UV/VUV switch-driven color-reversal effect for Tb-activated phosphors

Light(Science & Applications) 2016年第1期5卷 842-847页

作者： chun Che Lin Wei-Ting Chen cheng-i chu Kuan-Wei Huang Chiao-Wen Yeh Bing-Ming cheng Ru-Shi Liu Department of Chemistry Taiwan UniversityTaipei Synchrotron Radiation Research Hsinchu Department of Mechanical Engineering and Graduate institute of Manufacturing Technology Taipei University of TechnologyTaipei

The remarkable narrow-band emission of trivalent lanthanide-doped phosphors excited by the vacuum ultraviolet(VUV)radiation lines of Xe atoms/Xe_(2) molecules at 147/172 nm are extensively investigated in the development of plasma display panels and Hg-free fluorescent lamps,which are frequently used in our daily *** solid materials,particularly Tb^(3+)-doped oxides,such as silicates,phosphates and borates,are efficient green/blue sources with color-tunable *** excitation wavelength and rare earth concentration are usually varied to optimize efficiency and the luminescent ***,some underlying mechanisms for the shift in the emission colors remain *** present study shows that a UV/VUV switch systematically controls the change in the phosphor(Ba_(3)Si_(6)O_(12)N_(2):Tb)photoluminescence from green to blue,resulting in a green emission when the system is excited with UV ***,a blue color is observed when the radiation wavelength shifts to the VUV ***,a configurational coordinate model is proposed for the color-reversal *** this model,the dominant radiative decay results in a green emission under low-energy UV excitation from the ^(5)D_(4) state of the f–f inner-shell transition in the Tb ***,under high-energy VUV excitation,the state switches into the ^(5)D_(3) state,which exhibits a blue *** mechanism is expected to be generally applicable to Tb-doped phosphors and useful in adjusting the optical properties against well-known cross-relaxation processes by varying the ratio of the green/blue contributions.

关键词： color-reversal cross-relaxation phosphor terbium UV/VUV

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High Efficiency Coking Wastewater Treatment Process

High Efficiency Coking Wastewater Treatment Process

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第十届中国钢铁年会暨第六届宝钢学术年会

作者： cheng chu-i Chen Yanmin Engineer New Materials R＆D Dept. R＆D Division China Steel Corporation

Over 85% of COD in CSC coke-oven wastewater is removed by the conventional activated sludge system. in order to prevent the exceed quantity of incoming coke-oven wastewater that caused system upset, CSC has built a membrane bioreactor（MBR） to increase the capacity of the wastewater treatment system. The MBR is able to adapt unexpected high influent quantity and/or contaminant concentrations. The overall COD removal efficiency of coke oven wastewater treatment plant has been increased from 88% to 93%. in addition, CSC is planning to revamp the existing aeration tanks into a MBBR nitrogen removal process to meet the future ammonia standard of 20mg/L. The R＆D department has established the start-up strategies and the upset recovery plans based on the pilot study in the field. Preliminary pilot results show that phenolics, thiocyanate and cyanate will certainly inhibit nitrification. Moreover, the overall ratio of ammonia to alkalinity（as Ca CO3） in the start-up period of shall be 1:9, which is higher than the theoretical value of 1:4. This suggests that autotrophic bacteria such as thiocyanate-degrading bacteria existing in the activated sludge would consume the alkalinity as a carbon source for growth. Furthermore, with the application of carriers in the nitrification tank, the biofilm on the carriers can increase 20% of ammonia conversion rate.

关键词： coke-oven wastewater membrane bioreactor moving bed biofilm reactor(MBBR)

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Determinants of parental intent to vaccinate kindergarten children against seasonal influenza in Xiamen,China

Determinants of parental intent to vaccinate kindergarten ch...

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2017年中国卫生统计学学术年会

作者： Yaofeng Han Jiahui Yin Yanbing Zeng cheng-i chu Yi-Chen Chiang Ya Fang School of Public Health Xiamen University Department of Public Health Tzu Chi University

＜正＞Background and Objective:Seasonal influenza epidemics occur almost every year and one of the most susceptible groups are children under 6 years of *** is universally recommended that young children should be vaccinated against influenza annually,however,vaccination rates in China remain *** purposes of this study were:（1）to describe the influenza vaccination rate among kindergarten children in Xiamen,China;and（2）to explore the determinants（and possible interaction effects）

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Mediating effect of perceived necessity on parental intent to vaccinate kindergarten children against seasonal influenza

Mediating effect of perceived necessity on parental intent t...

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2017年中国卫生统计学学术年会

作者： Jiahui Yin Yi-Chen Chiang Chi-Min Wang Yanbing Zeng Yaofeng Han cheng-i chu Ya Fang School of Public Health Xiamen University Department of Public Health Tzu Chi University

＜正＞Background and Objective:One of the most susceptible demographic groups to seasonal influenza is children under 6 years of ***,in China,official data on vaccination rates among children are lacking,and few areas provide free *** objectives of our study were as follows:（1）to determine the influenza vaccination rate among kindergarten children in Xiamen and Taiwan,and（2）to explore possible

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Multiphoton quantum dynamics of many-electron atomic and molecular systems in intense laser fields

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Chinese Physics B 2020年第8期29卷 115-126页

作者： Peng-cheng Li Shih-i chu Research Center for Advanced Optics and Photoelectronics Department of PhysicsCollege of ScienceShantou UniversityShantou 515063China Key Laboratory of intelligent Manufacturing Technology of MOE Shantou UniversityShantou 515063China Department of Chemistry University of KansasLawrenceKansas 66045USA

We present the recent new developments of time-dependent Schrödinger equation and time-dependent density-functional theory for accurate and efficient treatment of the electronic structure and time-dependent quantum dynamics of many-electron atomic and molecular systems in intense laser *** extend time-dependent generalized pseudospectral(TDGPS)numerical method developed for time-dependent wave equations in multielectron *** TDGPS method allows us to obtain highly accurate time-dependent wave functions with the use of only a modest number of spatial grid point for complex quantum dynamical *** usefulness of these procedures is illustrated by a few case studies of atomic and molecular processes of current interests in intense laser fields,including multiphoton ionization,above-threshold ionization,high-order harmonic generation,attosecond pulse generation,and quantum dynamical processes related to multielectron *** conclude this paper with some open questions and perspectives of multiphoton quantum dynamics of many-electron atomic and molecular systems in intense laser fields.

关键词： multiphoton ionization above-threshold ionization high-order harmonic generation attosecond pulse generation

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Omnidirectional annealing process for scalable perovskite films

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international Journal of Minerals,Metallurgy and Materials 2022年第8期29卷 1491-1492页

作者： Bo cheng Dong Wang Qianqian chu Liang chu State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals School of Materials Science and EngineeringLanzhou University of Tech-nologyLanzhou 730050China institute of Carbon Neutrality and New Energy&School of Electronics and information Hangzhou Dianzi UniversityHangzhou 310018China

Halide perovskites are promising photovoltaic materials due to the outstanding photoelectric properties and low-cost solution pro-cess;however,the low scalability and reproducibility of perovskite films hinder the *** medium annealing(LMA)method has provided a robust liquid environment and an omnidirectional heating field to modulate the growth of perovskite films for high quality with low defect density,desirable stoichiometry,high homogeneity,and less environmental *** fabricated perovskite solar cells exhibited excellent reproducibility and power conversion efficiencies exceeding 24.04%with 0.08 cm^(2) area and 23.15%with 1 cm^(2) area.

关键词： halide perovskite scalable and reproducible fabrication liquid medium annealing

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A Modified Tikhonov Regularization Method for an Axisymmetric Backward Heat Equation

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Acta Mathematica Sinica,English Series 2010年第11期26卷 2157-2164页

作者： Wei cheng chu Li FU College of Science He'nan University of Technology Zhengzhou 450001 P. R. China School of Mathematics and Statistics Lanzhou University Lanzhou 730000 P. R. China

This paper deals with the inverse time problem for an axisymmetric heat equation. The problem is ill-posed. A modified Tikhonov regularization method is applied to formulate regularized solution which is stably convergent to the exact one. estimate between the approximate solution and exact technical inequality and improving a priori smoothness Meanwhile, a logarithmic-HSlder type error solution is obtained by introducing a rather assumption.

关键词： ill-posed problem axisymmetric backward heat equation regularization error estimate

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ERM Learning with Unbounded Sampling

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Acta Mathematica Sinica,English Series 2012年第1期28卷 97-104页

作者： cheng WANG Zheng chu GUO College of Mathematics and Statistics Wuhan UniversityWuhan 430072P.R.China School of Mathematics and Computational Science Sun Yat-Sen UniversityGuangzhou 510275P.R.China

The learning approach of empirical risk minimization （ERM） is taken for the regression problem in the least square framework. A standard assumption for the error analysis in the literature is the uniform boundedness of the output sampling process. in this paper we abandon this boundedness assumption and conduct error analysis for the ERM learning algorithm with unbounded sampling processes satisfying an increment condition for the moments of the output. The key novelty of our analysis is a covering number argument for estimating the sample error.

关键词： Learning theory least square regression ERM covering number

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Properties of the phase diagram from the Nambu-Jona-Lasino model with a scalar-vector interaction

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Nuclear Science and Techniques 2024年第10期35卷 168-179页

作者： Yong-Hang Yang He Liu Peng-cheng chu Science School Qingdao University of TechnologyQingdao 266520China The Research Center of Theoretical Physics Qingdao University of TechnologyQingdao 266033China

We investigated the properties of the phase diagram of high-order susceptibilities,speed of sound,and polytropic index based on an extended Nambu-Jona-Lasinio model with an eight-quark scalar-vector ***-monotonic behavior was observed in all these quantities around the phase transition boundary,which also revealed the properties of the critical ***,this study indicated that the chiral phase transition boundary and critical point could vary depending on the scalarvector coupling constant G_(SV).At finite densities and temperatures,the negative G_(SV)term exhibited attractive interactions,which enhanced the critical point temperature and reduced the chemical *** G_(SV)term also affected the properties of the high-order susceptibilities,speed of sound,and polytropic index near the critical *** non-monotonic(peak or dip)structures of these quantities shifted to a low baryon chemical potential(and high temperature)with a negative G_(SV).G_(SV)also changed the amplitude and range of the nonmonotonic ***,the scalar-vector interaction was useful for locating the phase boundary and critical point in QCD phase diagram by comparing the experimental *** study of the non-monotonic behavior of high-order susceptibilities,speed of sound,and polytropic index is of great interest,and further observations related to high-order susceptibilities,speed of sound,and polytropic index being found and applied to the search for critical points in heavy-ion collisions and the study of compact stars are eagerly awaited.

关键词： QCD phase diagram High-order susceptibilities Speed of sound Polytropic index NJL model

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Time-domain solution for transient dynamic response of a large-diameter thin-walled pipe pile

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Earthquake Engineering and Engineering Vibration 2015年第2期14卷 239-251页

作者： Ding Xuanming Liu Hanlong chu Jian cheng Ke Key Laboratory of New Technology for Construction of Cities in Mountain Area (Chongqing University) Ministry of Education Department of Civil Construction & Environmental Engineering Iowa State University 328 Town Engineering Building School of Mechanical and Power Engineering Nanjing University of Technology

The propagation of stress waves in a large-diameter pipe pile for low strain dynamic testing cannot be explained properly by traditional 1D wave theories. A new computational model is established to obtain a wave equation that can describe the dynamic response of a large-diameter thin-walled pipe pile to a transient point load during a low strain integrity test. An analytical solution in the time domain is deduced using the separation of variables and variation of constant methods. The validity of this new solution is verifi ed by an existing analytical solution under free boundary conditions. The results of this time domain solution are also compared with the results of a frequency domain solution and fi eld test data. The comparisons indicate that the new solution agrees well with the results of previous solutions. Parametric studies using the new solution with reference to a case study are also carried out. The results show that the mode number affects the accuracy of the dynamic response. A mode number greater than 10 is required to enable the calculated dynamic responses to be independent of the mode number. The dynamic response is also greatly affected by soil properties. The larger the side resistance, the smaller the displacement response and the smaller the refl ected velocity wave crest. The displacement increases as the stress waves propagate along the pile when the pile shaft is free. The incident waves of displacement and velocity responses of the pile are not the same among different points in the circumferential direction on the pile top. However, the arrival time and peak value of the pile tip refl ected waves are almost the same among different points on the pile top.

关键词： pipe pile transient load analytical solution time

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