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Generalized high-order twisted partially coherent beams and their propagation characteristics

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Frontiers of physics 2022年第5期17卷 167-174页

作者： Hai-yun Wang Zhao-Hui yang Kun Liu Ya-Hong Chen Lin Liu fei Wang yang-Jian Cai School of Physical Science and Technology&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215006China Shandong Provincial Engineering and Technical Center of Light Manipulations&Shandong Provincial Key Laboratory of Optics and Photonic Devices School of Physics and ElectronicsShandong Normal UniversityJinan 250014China

Twist phase is a nontrivial statistical phase that only exists in partially coherent fields,which makes the beam carry orbital angular momentum(OAM).In this paper,we introduce a new kind of partially coherent beams carrying high-order twist phase,named generalized high-order twisted partially coherent beams(GHTPCBs).The propagation dynamics such as the spectral density and OAM flux density propagating in free space are investigated numerically with the help of mode superposition and fast Fourier transform(FFT)*** results show that the GHTPCBs are capable of self-focusing,and the beam spot during propagation exhibits teardrop-like or the diamond-like shape in some certain ***,the influences of the twist order and the twist factor on the OAM flux density during propagation are also illustrated in ***,we experimentally synthesize the GHTPCBs with controllable twist phase by means of pseudo-mode superposition and measure their spectral density during *** experimental results agree well with the theoretical *** studies may find applications in nonlinear optics and particle trapping.

关键词： light manipulation statistical optics twist phase coherence structure orbital angular momentum

Impacts of Typhoons on the Kuroshio Large Meander:Observation Evidences

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Atmospheric and Oceanic Science Letters 2009年第1期2卷 45-50页

作者： Liang Sun Yuan-Jian yang yun-fei Fu Laboratory of Satellite Remote Sensing and Climate Environment School of Earth and Space Sciences University of Science and Technology of China Hefei 230026 China LASG Institute of Atmospheric Physics Chinese Academy of Sciences Beijing 100029 China

The formation of the Kuroshio large meander in summer 2004 was investigated by using the cruise data,Argo profiles data,and satellite remote sensing *** authors validated the point that cyclonic eddies contrib-uted to the large ***,.the impacts of ty-phoons on Kuroshio meanders were also *** 29 July to 4 August,the typhoons stirred the ocean and up-welled the deep water,which enhanced the existed cyc-lonic eddy,and immediately made a drastic meander of the ***,the unexpected typhoons in June 2004 also contributed to the initial meander at the Tokara *** result suggests an alternative meander mecha-nism of the Kuroshio path via the typhoon-eddy-Kuroshio *** is argued that typhoons accompanied with cyclonic eddies,might play crucial roles in meanders of the *** will provide a more comprehensive understanding of the dynamics of the western boundary flows,like the Kuroshio and the Gulf Stream,and will be useful in eddy-resolution models.

关键词： typhoon Kuroshio large meander

Association between cystatin C and diabetic retinopathy among type 2 diabetic patients in China: a Meta-analysis

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International Journal of Ophthalmology(English edition) 2021年第9期14卷 1430-1440页

作者： Nan yang yun-fei Lu Xiao yang Kui Jiang Ai-Min Sang Hui-Qun Wu Department of Medical Informatics Medical School of Nantong UniversityNantong 226001Jiangsu ProvinceChina Department of Ophthalmology Affiliated Hospital of Nantong UniversityNantong 226001Jiangsu ProvinceChina

AIM:To explore the correlation between cystatin C(Cys-C)and diabetic retinopathy(DR)in those patients with type 2 diabetes mellitus(DM)in ***:Articles were collected from China National Knowledge Infrastructure(CNKI),Wanfang,VIP,Pub Med,EMBASE,Cochrane Library,Clinical ***,and Google *** and risk of bias within included studies was assessed using the Newcastle-Ottawa scale(NOS).Heterogeneity was determined by using Cochran’s Q-test and Higgins I^(2) *** differences(MDs)and 95%confidence intervals(CIs)of Cys-C within the diabetes without retinopathy(DWR)and DR,DWR and non-proliferative diabetic retinopathy(NPDR),NPDR and proliferative diabetic retinopathy(PDR)were collected by using random-effects model because of high ***-analysis was conducted based on 23 articles of 2331 DR including NPDR and PDR patients and 2023 DWR patients through Review Manager *** analyses were also performed according to DM duration,body mass index(BMI),total cholesterol(TC),total triglycerides(TG),low-density lipoprotein C(LDL-C),and high-density lipoprotein C(HDL-C),sample origins and *** bias was assessed by the funnel ***:Cys-C level in DR patients was increased compared with that of DWR(total MD:0.69,95%CI:0.41 to 0.97,Z=4.79,P<0.01).Besides,the synthesized results of the studies showed the similar findings in the DWR vs NPDR group(total MD:0.29,95%CI 0.20 to 0.39,Z=6.02,P<0.01)and the NPDR vs PDR group(total MD:0.63,95%CI 0.43 to 0.82,Z=6.33,P<0.01).Heterogeneity of most of the subgroup analyses was still obvious(I^(2)≥50%,P<0.1).Forest plots of different subgroups indicated that there was a slight increase of Cys-C during the period between DWR and DR,DWR and NPDR,NPDR and *** plot showed that there was no significant publication ***:The elevated Cys-C is closely related with DR and probably plays a critical role in its progression.

关键词： diabetic retinopathy cystatin C Meta-analysis

Enhanced circular dichroism of plasmonic system in the strong coupling regime

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Chinese Physics B 2021年第4期30卷 492-496页

作者： yun-fei Zou Li Yu School of Science Beijing University of Posts and TelecommunicationsBeijing 100876China State Key Laboratory of Information Photonics and Optical Communications Beijing University of Posts and TelecommunicationsBeijing 100876China

The circular dichroism(CD) signal of a molecule is usually weak,however,a strong CD signal in optical spectrum is desirable because of its wide range of applications in biosensing,chiral photo detection,and chiral *** this work,we show that a strong chiral response can be obtained in a hybridized system consisting of an artificial chiral molecule and a nanorod in the strong coupling *** artificial chiral molecule is composed of six quantum dots in a helix assembly,and its CD signal arises from internal Coulomb interactions between quantum *** CD signal of the hybridized system is highly dependent on the Coulomb interactions and the strong coupling progress through the electromagnetic *** use the coupled oscillator model to analyze strong coupling phenomenon and address that the strong coupling progress can amplify the CD *** work provides a scenario for designing new plasmonic nanostructures with a strong chiral optical response.

关键词： plasmonic chirality strong coupling circular dichroism

Lower Exciton Number Strong Light Matter Interaction in Plasmonic Tweezers

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Chinese Physics Letters 2021年第2期38卷 18-21页

The plasmonic nanocavity is an excellent platform for the study of light matter interaction within a sub-diffraction volume under ambient *** design a structure of plasmonic tweezers,which can trap molecular Jaggregates and also serve as a plasmonic cavity with which to investigate strong light matter *** optical response of the cavity is calculated via finite-difference time-domain methods,and the optical force is evaluated based on the Maxwell stress tensor *** the help of the coupled oscillator model and virtual exciton theory,we investigate the strong coupling progress at the lower level of excitons,finding that a Rabi splitting of 230 meV can be obtained in a single exciton *** further analyze the relationship between optical force and model volume in the coupling *** proposed method offers a way to locate molecular J-aggregates in plasmonic tweezers for investigating optical force performance and strong light matter interaction.

关键词： interaction. method. coupling

Microstructure and tensile properties of isothermally forged Ni–43Ti–4Al–2Nb–2Hf alloy

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Rare Metals 2013年第5期32卷 475-479页

作者： Xiao-yun Song Yan Li fei Zhang State Key Laboratory of Nonferrous Metals & Processes General Research Institute for Nonferrous Metals Key Laboratory of Aerospace Materials and Performance (Ministry of Education) Beijing University of Aeronautics and Astronautics

NiTi-Al-based alloys are promising high-tem- perature structural materials for aerospace and astronautics applications. A new NiTi-Al-based alloy Ni--43Ti-4AI- 2Nb-2Hf （at%） was processed via isothermal forging. The microstructure and mechanical properties at room temperature and high temperature were investigated through scanning electron microscope （SEM）, X-ray diffraction （XRD）, and tensile tests. Results show that the micro- structure of as-forged Ni-43Ti--4AI-2Nb-2Hf alloy con- sists of NiTi matrix, Ti2Ni phase, and Hf-rich phase. The simultaneous addition of Nb and Hf, which have strong affinities for Ti sites, promotes the precipitation of Hf-rich phases along the grain boundaries. The tensile strengths of Ni-43Ti-4A1-2Nb-2Hf alloy are dramatically increased compared with the ternary Ni-46Ti-4A1 alloy. At room temperature and 650℃, the yield stress of Ni--43Ti-4Al- 2Nb-2Hf alloy reaches 1,070 and 610 MPa, respectively, which are 30 % and 150 % higher than those of Ni--46Ti- 4Al alloy. The improved tensile property results from the solid solution strengthening by Nb and Hf, as well as the dispersion hardening of the Ti2Ni and Hf-rich phases.

关键词： Intermetallics NiTi-Al alloy Isothermal forging Tensile property Microstructure

Clinical significance of nerve growth factor and tropomyosin-receptor-kinase signaling pathway in intrahepatic cholangiocarcinoma

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World Journal of Gastroenterology 2014年第14期20卷 4076-4084页

作者： Xiao-Qing yang yun-fei Xu Sen Guo Yi Liu Shang-Lei Ning Xiao-fei Lu Hui yang Yu-Xin Chen Department of Hepatobiliary Surgery Qilu Hospital of Shandong University Department of Pathology Shandong University Department of Gastrointestinal Surgery Central Hospital of Shandong University

AIM: To investigate the correlation between nerve growth factor-tropomyosin-receptor-kinase (NGF-TrkA) signaling pathway and prognosis in intrahepatic cholangiocarcinoma (IHCC).

关键词： Nerve growth factor Tropomyosin-receptor-kinase Prognosis Intrahepatic cholangiocarcinoma Progression

Inflation model selection revisited after a 1.91% measurement of the Hubble constant

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Science China(Physics,Mechanics & Astronomy) 2020年第9期63卷 35-36页

作者： Rui-yun Guo Jing-fei Zhang Xin Zhang Department of Physics College of SciencesXi’an Technological UniversityXi'an 710021China Department of Physics College of SciencesNortheastern UniversityShenyang 110819China

The recent local measurement of the Hubble constant based on the distance-ladder method has reached a 1.91%precision[1],but this result is in tension with the early-universe measurements at the more than 4σlevel,brin... 详细信息

关键词： cosmology. universe constant

UAVs cooperative task assignment and trajectory optimization with safety and time constraints

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Defence Technology（防务技术） 2023年第2期20卷 149-161页

作者： Duo Zheng yun-fei Zhang Fan Li Peng Cheng UAV Autonomous Control Institute Beijing Institute of TechnologyBeijing100081China Shanghai Institute of Mechanical and Electrical Engineering Shanghai201100China CASIC Research Institute of Intelligent Decision Engineering Wuhan100074China

This paper proposes new methods and strategies for Multi-UAVs cooperative attacks with safety and time constraints in a complex *** triangle is designed to construct a map of the complex flight environment for aerial ***-Map,Safe Flight Corridor(SFC),and Relative Safe Flight Corridor(RSFC)are applied to ensure each UAV flight trajectory's *** using such techniques,it is possible to avoid the collision with obstacles and collision between ***-curve is further developed to ensure that multi-UAVs can simultaneously reach the target at the specified time,and the trajectory is within the flight *** trajectory tracking controller is also designed based on model predictive control to track the planned trajectory *** simulation and experiment results are presented to verifying developed strategies of Multi-UAV cooperative attacks.

关键词： Multi-UAV Cooperative attacks Task assignment Trajectory optimization Safety constraints