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Regulated polarization degree of upconversion luminescence and multiple anti-counterfeit applications

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Rare Metals 2024年第5期43卷 2172-2183页

作者： Dong-ping Wen ping chen Yi Liang Xiao-Ming Mo Cao-Feng Pan Center On Nanoenergy Research Guangxi Key Laboratory for Relativistic AstrophysicsSchool of Physical Science and TechnologyGuangxi UniversityNanning 530004China Key Laboratory of Micronano Energy and Sensor CAS Center for Excellence in NanoscienceBeijing Institute of Nanoenergy and NanosystemsChinese Academy of SciencesBeijing 100140China

Polarization upconversion luminescence(PUCL)of lanthanide ions(Ln^(3+))has been widely used in single particle tracking,microfluidics detection,three-dimensional displays,and so ***,no effective strategy has been developed for modulating *** we report a strategy to regulate PUCL in Ho^(3+)-doped NaYF4single nanorods based on the number of upconversion *** constructing a multiphoton upconversion system for Ho^(3+),we regulate the degree of polarization(DOP)of PUCL from 0.590 for two-photon luminescence to 0.929 for three-photon upconversion luminescence(UCL).Furthermore,our strategy is verified from cross-relaxation between Ho^(3+)and Yb^(3+),excitation wavelength,excitation power density,and local site *** this regulation strategy of PUCL has also been achieved in Tm^(3+),with the DOP ranging from 0.233 for two-photon luminescence to 0.925 for four-photon UCL Besides,multi-dimensional anti-counterfeiting display has been explored with *** work provides an effective strategy for regulating PUCL and also provides more opportunities for the development of polarization display optical encoding,anti-counterfeiting,and integrated optical devices.

关键词： Polarization upconversion luminescence Degree of polarization Population density of excited state Number of upconversion photons Polarization anti-counterfeitingdisplay

Experimental study on desorption of soluble matter as influenced by cations in static water

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Water Science and Engineering 2014年第4期7卷 384-394页

作者： Wen-sheng XU Li chen Xiao-xia TONG Xiao-ping chen ping-cang ZHANG Division of Soil and Water Conservation Changjiang River Scientific Research Institute State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

With variation of drainage basin environments, desorption of soluble matter has become one of the significant erosion processes in rivers. It has a considerable impact on flow and sediment transport, as well as processes of river bed deformation and landform evolution throughout a watershed. In this study, considering influences on sediment movement, especially on cohesive sediment transport, Ca^2＋ and H^＋ were chosen as characteristic ions of soluble matter, and the total desorption quantity of Ca^2＋ and pH value when the desorption equilibrium is reached were employed as two indexes representing the desorption of soluble matter. By means of an indoor experiment, desorption of soluble matter as influenced by cations in static water was investigated. The results show that the total desorption quantity of soluble matter increases with the initial cation concentration until a maximum desorption quantity value is obtained and maintained. The total desorption quantity of soluble matter depends on properties of the specific cations in static water, and the stronger the affinity is between the cation and sediment surface, the higher the total desorption quantity will be. Finally, a strong approximate linear relationship between desorption quantities for different kinds of soluble matters was obtained, which means that variation of pH values can accurately reflect the desorption results of soluble matter.

关键词： soluble matter desorption cation sediment static water indoor experiment

A Class of New Large-Update Primal-Dual Interior-Point Algorithms for P＊（k） Nonlinear Complementarity Problems

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Acta Mathematica Sinica,English Series 2011年第10期27卷 1979-1994页

作者： Hua ping chen Ming Wang ZHANG College of Science China Three Gorges University Yichang 443002 P. R. China

In this paper we propose a class of new large-update primal-dual interior-point algorithms for P.（k） nonlinear complementarity problem （NCP）, which are based on a class of kernel functions investigated by Bai et al. in their recent work for linear optimization （LO）. The arguments for the algorithms are followed as Peng et al.＇s for P.（n） complementarity problem based on the self-regular functions [Peng, J., Roos, C., Terlaky, T.： Self-Regularity： A New Paradigm for Primal-Dual Interior- Point Algorithms, Princeton University Press, Princeton, 2002]. It is worth mentioning that since this class of kernel functions includes a class of non-self-regular functions as special case, so our algorithms are different from Peng et al.＇s and the corresponding analysis is simpler than theirs. The ultimate goal of the paper is to show that the algorithms based on these functions have favorable polynomial complexity.

关键词： Large-update method interior-point algorithm nonlinear complementarity problem non- self-regular function polynomial complexity

Convergence Rates for Probabilities of Moderate Deviations for Moving Average Processes

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Acta Mathematica Sinica,English Series 2008年第4期24卷 611-622页

作者： ping Yan chen Ding cheng WANG Department of Mathematics Jinan University Guangzhou 510630 P. R. China Center of Financial Mathematics MSI Australian National University Canberra Act 0200 Australia School of Applied Mathematics University of Electronic Science and Technology of ChinaChengdu 610054 P. R. China

The present paper first shows that, without any dependent structure assumptions for a sequence of random variables, the refined results of the complete convergence for the sequence is equivalent to the corresponding complete moment convergence of the sequence. Then this paper investigates the convergence rates and refined convergence rates （or complete moment convergence） for probabilities of moderate deviations of moving average processes. The results in this paper extend and generalize some well-known results.

关键词： complete convergence complete moment convergence moderate deviation law of the iterated logarithm invariance principle moving average process

Complete Moment Convergence for Sequence of Identically Distributed φ-mixing Random Variables

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Acta Mathematica Sinica,English Series 2010年第4期26卷 679-690页

作者： ping Yan chen Ding cheng WANG Department of Mathematics Ji'nan University Guangzhou 510630 P. R. China Center of Financial Mathematics MSI Australian National UniversityCanberra Act 0200 Australia School of Applied Mathematics University of Electronic Science and Technology of China Chengdu 610054 P. R. China

In the paper we extend and generalize some results of complete moment convergence results （or the refinement of complete convergence） obtained by Chow [On the rate of moment complete convergence of sample sums and extremes. Bull. Inst. Math. Academia Sinica, 16, 177-201 （1988）] and Li ＆ Spataru [Refinement of convergence rates for tail probabilities. J. Theor. Probab., 18, 933-947 （2005）] to sequences of identically distributed φ-mixing random variables.

关键词： complete convergence complete moment convergence φ-mixing

L^r Convergence for B-valued Random Elements

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Acta Mathematica Sinica,English Series 2012年第4期28卷 857-868页

作者： ping Yan chen Ding cheng WANG Department of Mathematics Ji'nan University School of Applied Mathematics University of Electronic Science and Technology of China

The paper investigates Lp convergence and Marcinkiewicz-Zygmund strong laws of large numbers for random elements in a Banach space under the condition that the Banach space is of Rademacher type p, 1 〈 p 〈 2. The paper also discusses Lτ convergence and Lτ bound for random elements without any geometric restriction condition on the Banach space.

关键词： Lτ convergence random element Rademacher type p Marcinkiewicz Zygmund stronglaw of large number

Interstitial Solution Carbon Concentration and Defects of Ti+Nb ULC-BH Steel by Internal Friction and Positron Annihilation Methods

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Journal of Iron and Steel Research International 2014年第1期21卷 91-97页

作者： Ji-ping chen Yong-lin KANG School of Metallurgical Engineering Key Laboratory of Metals and Processing of Anhui Province Anhui University of Technology School of Materials Science and Engineering State Key Laboratory for Advanced Metals and MaterialsUniversity of Science and Technology Beijing

The interstitial solution carbon concentration and defects in continuously annealed Ti＋Nb bearing ULC- BH （ultra-low carbon bake hardening） steel samples are investigated by multi-functional internal friction apparatus, positron annihilation lifetime spectroscopy （PALS） and coincidence Doppler broadening spectroscopy （CDBS）. The relationship of internal friction peaks, interstitial solution carbon concentrations and movable dislocations in the sam- ples under different conditions is analyzed. A correlation of lifetime component v~ values with interstitial solution car- bon concentrations in the samples for different continuous annealing processes is established, while a correlation of li- fetime component r2 values with multi-vacancies, vacancy clusters, microvoids and other types of defects for various continuous annealing processes is also demonstrated. Furthermore, the average lifetime results illustrate the overall defect densities for various continuous annealing processes. The CDBS analysis reflects the chemical surroundings of the defects at the annihilation sites and reveals that the peak heights of the ratio curves relate to the total number of defects such as interstitial carbon atoms, dislocations, vacancies and other types of defects. The results show that in- ternal friction, PALS and CDBS are effective techniques to identify and characterize the interstitial solution carbon concentration, multi-vacancies, vacancy clusters, microvoids and other types of microscopic defects in annealed Ti＋ Nb bearing ULC-BH steel.

关键词： ULC-BH steels internal frictions positron annihilation lifetimes coincidence Doppler broadening

Hydrides, Amides and Imides Mediated Ammonia Synthesis and Decomposition

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Chinese Journal of Chemistry 2019年第5期37卷 442-451页

作者： Wenbo Gao Jianping Guo ping chen Dalian National Laboratory for Clean Energy Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian Liaoning 116023 China University of Chinese Academy of Sciences Beijing 100049 China Collaborative Innovation Center of Chemistry for Energy Materials Dalian Liaoning 116023 Chino

What is the most favorite and original chemistry developed in your research group? Developments of alkali/alkaline earth amides, imides and hydrides for hydrogen storage and for catalytic ammonia synthesis are the most heart stirring scientific findings in our group. How do you get into this specific field? Could you please share some experiences with our readers? Accide ntal discovery and in tuition mean a lot to my academic career. It was an accidental observation that led me looking into hydrogen storage in Li3N;it was also an accidental finding that stimulated me to think of the potential of using hydrides as co-catalysts for ammonim synthesis and decomposition. Accidental discoveries, I believe, are the messages that the Nature conveys to us.

关键词： favorite developed group

Complete and Complete Moment Convergence for Weighted Sums of Widely Orthant Dependent Random Variables

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Acta Mathematica Sinica,English Series 2014年第9期30卷 1539-1548页

作者： De Hua QIU ping Yan chen School of Mathematics and Statistics Guangdong University of Finance & Economics Department of Mathematics Jinan University

In this paper, we establish a complete convergence result and a complete moment convergence result for weighted sums of widely orthant dependent random variables under mild conditions. As corollaries, the corresponding results for weighted sums of extended negatively orthant dependent random variables are also obtained, which generalize and improve the related known works in the literature.

关键词： Widely orthant dependent random variables extended negatively orthant dependent random variables complete convergence complete moment convergence