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Poisson double extensions

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Science China Mathematics 2020年第4期63卷 701-720页

作者： qi lou Sei-Qwon Oh Shengqiang Wang School of Mathematical Sciences Fudan UniversityShanghai 200433China Department of Mathematics Chungnam National UniversityDaejeon 34134Republic of Korea Department of Mathematics East China University of Science and TechnologyShanghai 200237China

A double Ore extension was introduced by Zhang and Zhang(2008)to study a class of ArtinShelter regular *** we give a definition of Poisson double extension which may be considered as an analogue of the double Ore extension,and show that algebras in a class of double Ore extensions are deformation quantizations of Poisson double *** also investigate the modular derivations of Poisson double extensions and the relationship between Poisson double extensions and iterated Poisson polynomial *** are illustrated by examples.

关键词： Poisson double extension semiclassical limit deformation quantization

Lagrangian coherent structure analysis on transport of Acetes chinensis along coast of Lianyungang,China

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Journal of Oceanology and Limnology 2024年第1期42卷 345-359页

作者： Kexin WANG Xueqing ZHANG qi lou Xusheng XIANG Ying XIONG College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Environment and Ecology Ministry of Education of ChinaOcean University of ChinaQingdao 266100China Jiangsu Marine Fisheries Research Institute Nantong 226007China

Spatial heterogeneity or“patchiness”of plankton distributions in the ocean has always been an attractive and challenging scientific issue to *** focused on the accumulation and dynamic mechanism of the Acetes chinensis in the Lianyungang nearshore licensed fishing *** Lagrangian frame approaches including the Lagrangian coherent structures theory,Lagrangian residual current,and Lagrangian particle-tracking model were applied to find the transport pathways and aggregation characteristics of Acetes *** exist some material transport pathways for Acetes chinensis passing through the licensed fishing area,and Acetes chinensis is easy to accumulate in the licensed fishing *** main mechanism forming this distribution pattern is the local circulation induced by the nonlinear interaction of topography and tidal *** the Lagrangian coherent structure analysis and the particle trajectory tracking indicate that Acetes chinensis in the licensed fishing area come from the nearshore *** work contributed to the adjustment of licensed fishing area and the efficient utilization of fishery resources.

关键词： plankton accumulation hydrodynamic model Lagrangian particle-tracking model Lagrangian analysis

Impact of typhoon Lekima(2019)on material transport in Laizhou Bay using Lagrangian coherent structures

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Journal of Oceanology and Limnology 2022年第3期40卷 922-933页

作者： qi lou Zhengyan LI Yanwei ZHANG Yilei FENG Xueqing ZHANG College of Oceanic and Atmospheric Sciences Ocean University of ChinaQingdao 266100China Key Laboratory of Marine Science and Numerical Modeling Ministry of Natural Resources(MNR)Qingdao 266061China

Typhoon has an impact on an estuary and coastal ***,the present research lacks the detailed description of material transport processes during typhoon passage,such as the transport channels and barriers in the course of material transport and material accumulation area,***,Lagrangian coherent structures(a method developed for describing the transport structure of fluids in recent years)was introduced to investigate and predict the floating material and debris transport process in the Laizhou Bay,Bohai Sea,during typhoon Lekima in *** show that the Lagrangian coherent structure could well explain the complex flow phenomena in the *** the typhoon,the general direction of floating material transport in the Laizhou Bay was *** was a channel for material transport in the northwest and south of the bay,and there are transportation obstacles in the northeast-southwest direction in the middle of the ***,the typhoon might worsen the water *** results provide references for precise countermeasures to control the formulation of pollution in the Laizhou Bay.

关键词： material transport typhoon Lagrangian coherent structures Laizhou Bay

The Derivation of Nutrient Criteria for the Adjacent Waters of Yellow River Estuary in China

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Journal of Ocean University of China 2022年第5期21卷 1227-1236页

作者： lou qi ZHANG Xueqing ZHAO Bei CAO Jing LI Zhengyan College of Environmental Science and Engineering Ocean University of ChinaQingdao 266100China North China Sea Environmental Monitoring Center State Oceanic AdministrationQingdao 266033China Key Laboratory of Marine Environmental Science and Ecology Ministry of EducationQingdao 266100China

Ecological protection and high-quality development of the Yellow River basin are becoming part of the national strategy in recent *** Yellow River Estuary has been seriously affected by human ***,it has been severely polluted by the nitrogen and phosphorus from land sources,which have caused serious eutrophication and harmful algal *** criteria,however,was not developed for the Yellow River Estuary,which hindered nutrient management measures and eutrophication risk assessment in this key ecological function zone of *** on field data during 2004-2019,we adopted the frequency distribution method,correlation analysis,Linear Regression Model(LRM),Classification and Regression Tree(CART)and Nonparametric Changepoint Analysis(nCPA)methods to establish the nutrient criteria for the adjacent waters of Yellow River *** water quality criteria of dissolved inorganic nitrogen(DIN)and soluble reactive phosphorus(SRP)are recommended as 244.0μg L^(−1) and 22.4μg L^(−1),*** is hoped that the results will provide scientific basis for the formulation of nutrient standards in this important estuary of China.

关键词： water quality criteria nutrient Yellow River Estuary frequency distribution classification and regression tree eutro-phication

Competition of Stimulated Raman Scattering in H_(2)-CH_(4) Mixed Gases

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Chinese Physics Letters 1999年第10期16卷 718-720页

作者： XU Jian-qiu lou qi-hong DONG Jing-Xing Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800

Competition of stimulated Raman scattering was observed in hydrogen-methane mixed gases pumped by a KrF *** Stokespulse of methane gas oscillated,shortened and was destroyed with the addition ofvarious ratios of hydrogen gas.A model including the feedback of the cell windows as well as competition between hydrogen and methane gas agree well with the experimental observations.

关键词： pumped scattering KrF

Autonomously Tuning Multilayer Thermal Cloak with Variable Thermal Conductivity Based on Thermal Triggered Dual Phase-Transition Metamaterial

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Chinese Physics Letters 2023年第9期40卷 54-60页

作者：娄琦夏明岗 Department of Applied Physics School of PhysicsXi’an Jiaotong UniversityXi’an 710049China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi’an Jiaotong UniversityXi’an 710049China Shaanxi Province Key Laboratory of Quantum Information and Optoelectronic Quantum Devices School of PhysicsXi’an Jiaotong UniversityXi’an 710049China

Thermal cloaks offer the potential to conceal internal objects from detection or to prevent thermal shock by controlling external heat flow. However, most conventional natural materials lack the desired flexibility and versatility required for on-demand thermal manipulation. We propose a solution in the form of homogeneous multilayer thermodynamic cloaks. Through an ingenious design, these cloaks achieve exceptional and extreme parameters, enabling the distribution of multiple materials in space. We first investigate the effects of important design parameters on the thermal shielding effectiveness of conventional thermal cloaks. Subsequently, we introduce an autonomous tuning function for the thermodynamic cloak, accomplished by leveraging two phase transition materials as thermal conductive layers. Remarkably, this tuning function does not require any energy input. Finite element analysis results demonstrate a significant reduction in the temperature gradient inside the thermal cloak compared to the surrounding background. This reduction indicates the cloak’s remarkable ability to manipulate the spatial thermal field. Furthermore, the utilization of materials undergoing phase transition leads to an increase in thermal conductivity, enabling the cloak to achieve the opposite variation of the temperature field between the object region and the background. This means that, while the temperature gradient within the cloak decreases, the temperature gradient in the background increases. This work addresses a compelling and crucial challenge in the realm of thermal metamaterials, i.e., autonomous tuning of the thermal field without energy input. Such an achievement is currently unattainable with existing natural materials. This study establishes the groundwork for the application of thermal metamaterials in thermodynamic cloaks, with potential extensions into thermal energy harvesting, thermal camouflage, and thermoelectric conversion *** harnessing phonons, our fi

关键词： thermodynamic autonomous Transition

Compact All-Fiber 102W Picosecond MOPA Laser with a Narrow Spectral Linewidth

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Chinese Physics Letters 2011年第11期28卷 121-123页

作者： WU Wen-Di REN Ting-qi ZHOU Jun DU Song-Tao GU Xi-Jia lou qi-Hong College of Physics and Engineering Qufu Normal UniversityQufu 273165 Shanghai Key Laboratory of All Solid-State Laser and Applied Techniques Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800 Department of Electrical and Computer Engineering Ryerson UniversityTorontoCanada

We report an all-fiber-based master oscillator power amplifier picosecond ytterbium-doped fiber laser with an average power of 102W and a spectral line width of 0.1 *** seed source is a compact single mode passively mode-locked fiber laser with an average power of 2.48 ***,the laser maximum average output power of 102W picosecond pulses is realized by a direct all-fiber amplifier structure in one *** experiment enables the optical-to-optical conversion efficiency to reach 61.4%,with the central wavelength of 1063.7nm.A significant feature of this experiment is the spectral line width of 0.1 *** spectrum has no broadening or nonlinear effects when the pump is strengthened.

关键词： amplifier fiber pump

Recent progress in subatomic particle detection technology

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Frontiers of physics 2013年第5期8卷 548-554页

作者： Zhi-Huan Li Jian-Ling lou qi-Te Li Yu-Cheng Ge Zhe-Wei Yin Yan-Lin Ye School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China

Particle detection technologies have been largely advanced in ,boratory over the past decade. A neutron sphere was built to detect the decay neutron emitted from the implanted unstable nu eleus, whereas a multi-neutron correlation spectrometer was implemented to detect the forward moving neutrons resulting from breakup reactions. Charged particle telescopes are now equipped with double sided Silicon strip detectors which have excellent energy and position resolutions. Large size gas chambers, such as resistive plate chambers, have been developed in order to achieve high Derformances related to timing or position measurements. The advances of these technologies con tribute substantially to such large science project, as LHC-CMS, and to the experiments with the radioactive nucleus beams.

关键词： subatomic particles detection nuclear physics

Design,fabrication and optimization of electromagnetic absorption metamaterials

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Chinese Physics B 2023年第9期32卷 1-14页

作者：娄琦张旭东夏明岗 Department of Applied Physics School of PhysicsXi'an Jiaotong UniversityXi'an 710049China MOE Key Laboratory for Nonequilibrium Synthesis and Modulation of Condensed Matter School of PhysicsXi'an Jiaotong UniversityXi'an 710049China Shaanxi Province Key Laboratory of Quantum Information and Optoelectronic Quantum Devices School of PhysicsXi'an Jiaotong UniversityXi'an 710049China

For decades,the rapid development of wireless communication has provided people a smarter way of ***,a significant increase in electromagnetic pollution is an unavoidable *** radar detection in modern warfare has also become an important prerequisite for survival on the *** review provides a comprehensive overview of the current status and types of electromagnetic absorption metamaterials,especially their design and preparation ***,this review focuses on the strategies used to optimize the absorber absorption ***,this review presents a viewpoint on future research on electromagnetic absorption metamaterials,the main challenges that need to be addressed and the possible solutions.

关键词： metamaterial electromagnetic wave absorption fractal design