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Observation of Optical Bistability in Two-Dimensional Volume Refractive Index Grating Thermally Fixed in LiNbO_(3):Fe Crystal

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Chinese Physics Letters 1996年第6期13卷 440-443页

作者： WANG Zhen-lin WU Jun YANG Zhen-ju zhu yong-yuan Min Nai-ben National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093

Experimental observation of optical bistability in a nonlinear two-dimensional volume refractive index grating is *** index grating in LiNbO_(3):0.1 wt.%Fe photorefractive single crystal was fabricated by using hologram recording and subsequent thermal fixing *** to the thermal fixing,the stored 2D volume index grating shows no optical erasure during *** explanation of the nonlinear phenomena is also given in terms of the intensity-enhanced bulk photovoltaic effects in LiNbO_(3):Fe material.

关键词： stability Refractive nonlinear

Single Pass Third-Harmonic Generation of 310mW of 355 nm with an All-Solid-State Laser

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Chinese Physics Letters 2001年第12期18卷 1589-1591页

作者： JIA Yu-Lei HE Jing-Liang WANG Hui-Tian zhu Shi-Ning zhu yong-yuan Laboratory of Modern Optics Shandong Normal UniversityJi'nan 250014 National Laboratory of Solid State Microstructure Nanjing UniversityNanjing 210093

A maximum of 310mW average output power at 355nm has been obtained by extracavity frequency tripling with a BBO crystal in a Q-switched Nd:YV04 laser with 11.2 W of laser diode pump power. The single pass frequency conversion efficiency (infrared-to-ultraviolet) is 14.3%. The power stability of the ultraviolet laser is better than 1% in 30min.

关键词： laser switched Nd:

Strong Coupling of a Meta-Diatom to a Plasmonic Nanocavity

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Chinese Physics Letters 2013年第8期30卷 148-151页

作者： CHEN San LU Hong-Yan LIU Jian-Qiang zhu yong-yuan School of Physics and Electronic Information Huaibei Normal UniversityHuaibei 235000 School of Science Jiujiang UniversityJiujiang 332005 National Laboratory of Solid State Microstructures and Department of PhysicsNanjing UniversityNanjing 210093

A strong coupling meta-diatom-plasmonic nanocavity is proposed and numerically *** the meta-diatomic sizes are gradually increased,the meta-diatomic electric dipole and quadrupole resonances could strongly couple to those of the *** characteristic anticrossing behaviors of three hybrid modes manifest the occurrence of the strong coupling from the transmission spectra,with Rabi-type splittings at about 40.8 meV and 128.4 meV for dipole interaction,and 11.8 meV and 72.7 meV for quadrupole interaction,*** also present the coupling strength dependence on meta-atomic positions,in which one meta-atomic position is fixed and the other is *** average Rabi-type splittings of three polariton modes are used to evaluate the coupling strength of the meta-atomic position *** corresponding Rabi-type oscillation in the time domain is also presented,which is obviously different from the one of a single meta-atom strongly coupling to a nanocavity.

关键词： coupling dipole splitting

Parameter selection for the hydroconversion of waste polyethylene plastic under mild conditions: A comprehensive evaluation

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Science China(Technological Sciences) 2024年第8期67卷 2413-2426页

作者： CHENG LeiLei CHEN RuiZhe zhu WeiQiang TIAN ShaoNan GU Jing yuan HaoRan CHEN yong Guangzhou Institute of Energy Conversion Chinese Academy of SciencesGuangzhou 510640China School of Energy Science and Engineering University of Science and Technology of ChinaHefei 230026China Institute of Process Engineering Chinese Academy of SciencesBeijing 100190China

The hydrogenolysis/hydrocracking of waste polyethylene(PE) has recently been intensively studied, with the general pursuit of low-temperature reaction conditions, increased oil-phase yield, and narrower carbon chain distribution. Before this, we utilized a ball-milled ZSM-22 catalyst loaded with Ru nanoparticles(NPs), which exhibited excellent hydroconversion performance. It deconstructed PE into >80 wt.% oil products under low temperatures and short reaction times. Herein, we investigated the influence of varying temperature/pressure parameters on the degree of specific hydrocracking/internal hydrogenolysis/terminal hydrogenolysis reactions. From the comprehensive energy efficiency perspective, including stirring, reaction, and product separation, as well as taking into account the degree of product isomerization and catalyst lifespan, we analyzed the optimization of parameters. This research abandons the notion that lower temperatures are better and proposes a more comprehensive evaluation framework for low-consumption hydroconversion of PE to produce high-value products.

关键词： plastic upcycling polyethylene hydrocracking hydrogenolysis comprehensive energy efficiency

C-F insertion reaction sheds new light on the construction of fluorinated compounds

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Chinese Chemical Letters 2024年第8期35卷 163-169页

作者： Dong-Sheng Deng Su-Qin Tang yong-Tu yuan Ding-Xiong Xie Zhi-yuan zhu Yue-Mei Huang Yun-Lin Liu Henan Key Laboratory of Function-Oriented Porous Materials and College of Chemistry and Chemical EngineeringLuoyang Normal UniversityLuoyang 471934China School of Chemistry and Chemical Engineering Guangzhou UniversityGuangzhou 510006China Key Laboratory of Organofluorine Chemistry Shanghai Institute of Organic ChemistryChinese Academy of SciencesShanghai 200032China

The atom-economical C-F insertion chemistry is emerged as a promising technology for the synthesis of various fluorinated scaffolds,which have wide applications both in the academic and the industrial *** past three years have witnessed rapid developments in this *** highlight provides an overview on the evolution according to the fluorinating agents used.

关键词： C-F insertion Benzyl fluoride Acyl fluoride gem-Difluorocyclopropane Fluorinated scaffold

Pyrolysis Empirical Modeling of Polyester Glass Fiber Reinforced Plastics Using Sestak-Berggren Model Method

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Journal of Thermal Science 2024年第2期33卷 725-738页

作者： NAN Wei JI Wenhui yuan Yanping yuan Zhongyuan SUN yong School of Mechanical Engineering Southwest Jiaotong UniversityChengdu610031China CRRC Changchun Railway Vehicles Co. LtdChangchun130062China

Polyester Glass Fiber Reinforced Plastic(Polyester GFRP),a thermosetting plastic comprised of glass fiber and polyester polymer compounds,is extensively utilized in high-speed *** its pyrolysis mechanism is crucial as it significantly influences the combustion characteristics and fire safety ***,kinetic research on polyester GFRP primarily focuses on employing the Coats-Redfern method to derive a theoretical kinetic ***,the pyrolysis process of polyester GFRP is complex and the aforementioned theoretical model fails to accurately describe the pyrolysis ***,this study seeks to utilize the Sestak and Berggren(SB) model as a methodological approach to reveal the complex reaction mechanism during the pyrolysis *** on thermogravimetric analysis,the entire pyrolysis process of polyester GFRP is divided into two primary ***,model-free methods are employed to ascertain the activation energy and pre-exponential *** results show that the fitted empirical models of the two main pyrolysis stages are f(α)=(1-α)^(1.47)[-ln(1-α)]^(1.50) and f(α)=(1-α)^(1.77)[-ln(1-α)]^(1.72),*** predicted results are in good agreement with experimental data under different heating rates,which indicates that the empirical model can sufficiently describe the pyrolysis process of polyester GFRP.

关键词： polyester GFRP model-fitting methods empirical models pyrolysis

Red and Blue Light Generation in an LiTaO_(3) Crystal with a Double Grating Domain Structure

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Chinese Physics Letters 2001年第4期18卷 539-540页

作者： LIU Zhao-Wei zhu Shi-Ning zhu yong-yuan WANG Hui-Tian LUO Guo-Zhen LIU Hui MIN Nai-Ben LIANG Xiao-Yan XU Zu-Yan National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093 Institute of Physics and Center for condensed Matter Physics Chinese Academy of SciencesBeijing 100080

Simultaneous red and blue light generation in an LiTaO_(3) crystal with a double grating structure is first *** double grating consists of two separate domain reversal sequences(superlattices)in series and is fabricated by field poling technique at room *** a picosecond 532 nm laser as a pump source,the red light at 631 nm and blue light at 460 nm are generated at the same time.A possible application of the superlattice crystal is presented.

关键词： temperature pump Crystal

High-order Soliton Matrix for the Third-order Flow Equation of the Gerdjikov-Ivanov Hierarchy Through the Riemann-Hilbert Method

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Acta Mathematicae Applicatae Sinica 2024年第2期40卷 358-378页

作者： Jin-yan zhu yong CHEN School of Mathematical Sciences Shanghai Key Laboratory of Pure Mathematics and Mathematical PracticeEast China Normal UniversityShanghai 200062China College of Mathematics and Systems Science Shandong University of Science and TechnologyQingdao 266590China

The Gerdjikov-Ivanov(GI)hierarchy is derived via recursion operator,in this article,we mainly investigate the third-order flow GI *** the framework of the Riemann-Hilbert method,the soliton matrices of the third-order flow GI equation with simple zeros and elementary high-order zeros of Riemann-Hilbert problem are constructed through the standard dressing *** advantage of this result,some properties and asymptotic analysis of single soliton solution and two soliton solution are discussed,and the simple elastic interaction of two soliton are *** with soliton solution of the classical second-order flow,we find that the higher-order dispersion term affects the propagation velocity,propagation direction and amplitude of the ***,by means of a certain limit technique,the high-order soliton solution matrix for the third-order flow GI equation is derived.

关键词： Gerdjikov-Ivanov hierarchy third-order flow GI equation Riemann-Hilbert method high-order soliton

Partial Collapsing Degeneration of Floer Trajectories and Adiabatic Gluing

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Acta Mathematica Sinica,English Series 2024年第1期40卷 161-249页

作者： yong-Geun OH Ke zhu Center for Geometry and Physics Institute for Basic Science(IBS)79 Jigok-ro 127beon-gilNam-guPohang-siGyeongsangbuk-doKorea 37673&POSTECHGyeongsangbuk doKorea Department of Mathematics and Statistics Minnesota State UniversityMankatoMN 56001USA

In the present paper,we study partial collapsing degeneration of Hamiltonian-perturbed Floer trajectories for an adiabatic ε-family and its reversal adiabatic gluing,as the prototype of the partial collapsing degeneration of 2-dimensional(perturbed)J-holomorphic maps to 1-dimensional gradient *** consider the case when the Floer equations are S^(1)-invariant on parts of their domains whose adiabatic limit has positive length as ε→0,which we call thimble-flow-thimble *** main gluing theorem we prove also applies to the case with Lagrangian boundaries such as in the problem of recovering holomorphic disks out of pearly *** particular,our gluing theorem gives rise to a new direct proof of the chain isomorphism property between the Morse-Bott version of Lagrangian intersection Floer complex of L by Fukaya-Oh-Ohta-Ono and the pearly complex of L Lalonde and *** also provides another proof of the present authors’earlier proof of the isomorphism property of the PSS map without involving the target rescaling and the scale-dependent gluing.

关键词： Floer trajectory equation partial collapsing degeneration thimble-flow-thimble moduli space adiabatic gluing exponential decay estimates three-interval method