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Four-soliton solution and soliton interactions of the generalized coupled nonlinear Schrodinger equation

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Chinese Physics B 2020年第6期29卷 216-223页

作者： li-jun song Xiao-Ya Xu Yan Wang Department of Physics and Electronic Engineering Shanxi UniversityTaiyuan 030006China

Based on the generalized coupled nonlinear Schr¨odinger equation,we obtain the analytic four-bright–bright soliton solution by using the Hirota bilinear *** interactions among four solitons are also studied in *** results show that the interaction among four solitons mainly depends on the values of solution parameters;k1 and k2 mainly affect the two inboard solitons while k3 and k4 mainly affect the two outboard solitons;the pulse velocity and width mainly depend on the imaginary part of ki(i=1,2,3,4),while the pulse amplitude mainly depends on the real part of ki(i=1,2,3,4).

关键词： coupled nonlinear Schrodinger equation four-soliton solution soliton interaction

西双版纳热带雨林不同生长型木本植物功能多样性

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林业科学研究 2024年第3期37卷 37-48页

作者：陈燕旋黄小波郎学东唐荣张锐李聪李俊松李有寿王校海苏建荣李帅锋中国林业科学研究院高原林业研究所云南昆明650224 国家林业和草原局云南普洱森林生态系统国家定位观测研究站云南昆明650224 普洱森林生态系统云南省野外科学观测研究站云南昆明650224 西双版纳国家级自然保护区云南西双版纳666300

[目的]通过分析西双版纳热带雨林不同生长型木本植物功能性状的差异,揭示热带雨林不同生长型木本植物功能多样性的变化规律以及影响因素。[方法]本文基于西双版纳国家级自然保护区勐仑、补蚌和尚勇等片区3块1 hm2动态监测样地的调查数... 详细信息

[目的]通过分析西双版纳热带雨林不同生长型木本植物功能性状的差异,揭示热带雨林不同生长型木本植物功能多样性的变化规律以及影响因素。[方法]本文基于西双版纳国家级自然保护区勐仑、补蚌和尚勇等片区3块1 hm2动态监测样地的调查数据和木本植物功能性状数据,利用单因素方差分析、主成分分析、Pearson相关分析、冗余分析以及多元线性回归分析等方法,分析西双版纳热带雨林不同生长型木本植物功能多样性的差异,阐明热带雨林木本植物群落的功能特征及主要影响因子。[结果](1)乔木的叶面积、叶碳含量、叶干物质含量的群落加权平均值均显著高于灌木和藤本,而藤本叶氮含量和比叶面积的群落加权平均值显著高于乔木和灌木。(2)乔木功能丰富度和功能离散度高于灌木和藤本,而灌木功能均匀度和功能分异度均高于乔木和藤本。(3)乔木和藤本功能丰富度以及藤本功能离散度随物种丰富度、多度和系统发育多样性的增加而显著增大;乔木功能均匀度和功能分异度随土壤肥力的增大而显著增大,而灌木功能离散度随物种丰富度的增加而增大。(4)植物多度是影响乔木和灌木功能性状群落加权平均值的主要因素,而系统发育多样性、物种丰富度和土壤肥力是影响藤本功能性状群落加权平均值的主要因素。[结论]表明西双版纳热带雨林不同生长型木本植物群落在功能性状和功能多样性之间存在显著差异性,且植物多度和土壤肥力在热带雨林植物群落功能多样性维持机制中起到重要作用。

关键词：功能多样性土壤肥力多度热带雨林生长型木本植物

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卷丹多糖的结构表征及其对PM_(2.5)暴露致小鼠急性肺损伤的影响

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天然产物研究与开发 2024年第8期36卷 1385-1392页

作者：柯益鑫王子林李卓远陈雅茜陶琳井山林李俊松南京中医药大学药学院南京210023

对卷丹多糖(lilii Lancifolii Bulbus polysaccharide,LP)的结构进行表征,并考察卷丹水提液(lilii Lancifolii Bulbus water extract,LW)及其多糖部位对PM_(2.5)暴露致小鼠急性肺损伤的保护作用。采用水提醇沉法得到LP并利用苯酚-硫酸... 详细信息

对卷丹多糖(lilii Lancifolii Bulbus polysaccharide,LP)的结构进行表征,并考察卷丹水提液(lilii Lancifolii Bulbus water extract,LW)及其多糖部位对PM_(2.5)暴露致小鼠急性肺损伤的保护作用。采用水提醇沉法得到LP并利用苯酚-硫酸法测定其总糖含量,利用纤维素层析法对其进行分离纯化,采用凝胶渗透色谱以及1-苯基-3-甲基-5-吡唑啉酮(1-phenyl-3-methyl-5-pyrazolone,PMP)柱前衍生化法对LP结构进行分析,并考察了LW和LP对PM_(2.5)暴露致小鼠急性肺损伤的影响。结果测得LP的总糖含量为(70.98±2.36)%,分离纯化得到LP主要成分LP-1的相对分子量为5906 Da,主要由甘露糖和葡萄糖组成,摩尔比为1.00∶2.01。与空白组相比较,模型组小鼠体重增势缓慢(P<0.01),肺组织损伤严重,肺指数以及肺组织中的炎症因子平增加(P<0.01)。与模型组相比较,阳性药(地塞米松)组以及LW和LP组小鼠体重显著增长(P<0.01),肺组织结构均相对完整,肺指数、肺组织病理评分、炎症因子水平显著降低(P<0.05)。并且,相同给药剂量下,LW与LP组之间的疗效基本一致,表明卷丹多糖可能是卷丹有效改善肺损伤小鼠的肺部组织形态,减少肺部炎症因子表达,发挥PM_(2.5)暴露致急性肺损伤疗效的重要药效物质基础。

关键词：卷丹多糖 PM_(2.5) 急性肺损伤药效物质基础

Compressed Data Separation via ℓ_(q)-Split Analysis with ℓ_(∞)-Constraint

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Acta Mathematica Sinica,English Series 2024年第7期40卷 1655-1673页

作者： Ming Yang Gu song li jun Hong lin School of Mathematical Science Zhejiang UniversityHangzhou310027P.R.China Center for Data Science Zhejiang UniversityHangzhou310027P.R.China

In this paper,we study compressed data separation(CDS)problem,i.e.,sparse data separation from a few linear random *** propose the nonconvex ℓ_(q)-split analysis with ℓ_(∞)-constraint and 0lit-analysis Dantzig selector(ℓ_(q)-split-analysis DS).We show that the two distinct subcomponents that are approximately sparse in terms of two different dictionaries could be stably approximated via the ℓ_(q)-split-analysis DS,provided that the measurement matrix satisfies either a classical D-RIP(Restricted Isometry Property with respect to Dictionaries and ℓ_(2) norm)or a relatively new(D,q)-RIP(RIP with respect to Dictionaries and ℓ_(q)-quasi norm)condition and the two different dictionaries satisfy a mutual coherence condition between *** the Gaussian random measurements,the measurement number needed for the(D,q)-RIP condition is far less than those needed for the D-RIP condition and the(D,1)-RIP condition when q is small enough.

关键词： Data separation ℓ_(q)-split analysis Dantzig selector frames restricted isometry property compressed sensing

Optimization of a magneto–optic trap using nanofibers

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Chinese Physics B 2019年第7期28卷 198-201页

作者： Xin Wang li-jun song Chen-Xi Wang Peng-Fei Zhang Gang li Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-Electronics Shanxi University Taiyuan 030006 China Collaborative Innovation Center of Extreme Optics Shanxi University Taiyuan 030006 China

We experimentally demonstrate a reliable method based on a nanofiber to optimize the number of cold atoms in a magneto–optical trap(MOT) and to monitor the MOT in real *** atomic fluorescence is collected by a nanofiber with subwavelength diameter of about 400 *** MOT parameters are experimentally adjusted in order to match the maximum number of cold atoms provided by the fluorescence collected by the *** maximum number of cold atoms is obtained when the intensities of the cooling and re-pumping beams are about 23.5 mW/cm^2 and 7.1 mW/cm^2,respectively;the detuning of the cooling beam is-13.0 MHz, and the axial magnetic gradient is about 9.7 Gauss/*** observe a maximum photon counting rate of nearly(4.5 ± 0.1)× 10^5 counts/*** nanofiber–atom system can provide a powerful and flexible tool for sensitive atom detection and for monitoring atom–matter *** can be widely used from quantum optics to quantum precision measurement.

关键词： nanofiber magneto–optic trap optimization fluorescence efficient coupling

Gas film/regenerative composite cooling characteristics of the liquid oxygen/liquid methane (LOX/LCH4) rocket engine

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2024年第8期25卷 631-649页

作者： Xinlin liU jun SUN Zhuohang JIANG Qinglian li Peng CHENG Jie song Science and Technology on Scramjet Laboratory College of Aerospace Science and EngineeringNational University of Defense TechnologyChangsha 410073China

The thermal protection of rocket engines is a crucial aspect of rocket engine *** this paper,the gas film/regenerative composite cooling of the liquid oxygen/liquid methane(LOX/LCH4)rocket engine thrust chamber was investigated.A gas film/regenerative composite cooling model was developed based on the Grisson gas film cooling efficiency formula and the one-dimensional regenerative cooling *** accuracy of the model was validated through experiments conducted on a 6 kg/s level gas film/regenerative composite cooling thrust ***,key parameters related to heat transfer performance were *** results demonstrate that the model is sufficiently accurate to be used as a preliminary design *** temperature rise error of the coolant,when compared with the experimental results,was found to be less than 10%.Although the pressure drop error is relatively large,the calculated results still provide valuable guidance for heat transfer *** addition,the performance of composite cooling is observed to be superior to regenerative *** the gas film flow rate results in higher cooling efficiency and a lower gas-side wall ***,the position at which the gas film is introduced greatly impacts the cooling *** optimal introduction position for the gas film is determined when the film is introduced from a single row of *** optimal introduction position results in a more uniform wall temperature distribution and reduces the peak ***,it is observed that a double row of holes,when compared to a single row of holes,enhances the cooling effect in the superposition area of the gas film and further lowers the gas-side wall *** results provide a basis for the design of gas film/regenerative composite cooling systems.

关键词： liquid oxygen/liquid methane(LOX/LCH4)rocket engine Gas film cooling Regenerative cooling Heat transfer characteristics

Toeplitz Operators and Carleson Measures for Weighted Bergman Spaces Induced by Regular Weights

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Acta Mathematica Sinica,English Series 2024年第5期40卷 1345-1359页

作者： jun Tao DU song Xiao Hasi WULAN Department of Mathematics Guangdong University of Petrochemical TechnologyMaoming 525000P.R.China Department of Mathematics Shantou UniversityShantou 515063P.R.China

In this paper,we give a universal description of the boundedness and compactness of Toeplitz operator T_(μ)^(ω)between Bergman spaces A_(η)^(p)and A_(υ)^(q)whenμis a positive Borel measure,1lity and Kahane’s inequality,we get a new characterization of the Carleson measure for Bergman spaces induced by regular weights.

关键词： Bergman space Carleson measure Toeplitz operator regular weight

Multi-Time Scale Operation and Simulation Strategy of the Park Based on Model Predictive Control

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Energy Engineering 2024年第3期121卷 747-767页

作者： jun Zhao Chaoying Yang Ran li Jinge song Grid Center State Grid Shanxi Electric Power Company Electric Power Science Research InstituteTaiyuan030000China

Due to the impact of source-load prediction power errors and uncertainties,the actual operation of the park will have a wide range of fluctuations compared with the expected state,resulting in its inability to achieve the expected *** paper constructs an operating simulation model of the park power grid operation considering demand response and proposes a multi-time scale operating simulation method that combines day-ahead optimization and model predictive control(MPC).In the day-ahead stage,an operating simulation plan that comprehensively considers the user’s side comfort and operating costs is proposed with a long-term time scale of 15 *** order to cope with power fluctuations of photovoltaic,wind turbine and conventional load,MPC is used to track and roll correct the day-ahead operating simulation plan in the intra-day stage to meet the actual operating operation status of the ***,the validity and economy of the operating simulation strategy are verified through the analysis of arithmetic examples.

关键词： Demand response model predictive control multiple time scales operating simulation

Tunable Optical Bandpass Filter via a Microtip-Touched Tapered Optical Fiber

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Chinese Physics Letters 2020年第10期37卷 26-32页

作者： Peng-Fei Zhang li-jun song Chang-ling Zou Xin Wang Chen-Xi Wang Gang li Tian-Cai Zhang State Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006China CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China

We demonstrate a tunable bandpass optical filter based on a tapered optical fiber(TOF)touched by a hemispherical microfiber tip(MFT).Other than the interference and selective material absorption effects,the filter relies on the controllable and wavelength-dependent mode–mode interactions in ***,a large range of tunability is realized by controlling the position of the MFT in contact with the TOF for various TOF radii,and two distinct bandpass filter mechanisms are *** center wavelength of the bandpass filter can be tuned from 890 nm to 1000 nm,while the FWHM bandwidth can be tuned from 110 nm to 240 nm when the MFT touches the TOF in the radius range from 160 nm to 390 *** distinction ratio can reach 28±3 dB *** combined TOF-MFT is an in-line tunable bandpass optical filter that has great application potential in optical networks and spectroscopy,and the principle could also be generalized to other integrated photonic devices.

关键词： tunable fiber Touch