检索结果-南通市图书馆

Light(Science & Applications) 2024年第2期13卷 354-365页

作者： Yaoxiang Liu fukang yin Tie-Jun Wang Yuxin Leng Ruxin Li Zhizhan Xu See Leang Chin State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Centre d’Optique Photonique et Laser(COPL)and Département de physiquede génie physique et d’optiqueUniversitéLavalQuébecQuébecCanada

Supercontinuum(SC)light source has advanced ultrafast laser spectroscopy in condensed matter science,biology,physics,and *** to the frequently used photonic crystal fibers and bulk materials,femtosecond laser filamentation in gases is damage-immune for supercontinuum generation.A bottleneck problem is the strong jitters from filament induced self-heating at kHz repetition rate *** demonstrated stable kHz supercontinuum generation directly in air with multiple mJ level pulse *** was achieved by applying an external DC electric field to the air plasma *** pointing jitters of the 1 kHz air filament induced SC light were reduced by more than 2 *** stabilized high repetition rate laser filament offers the opportunity for stable intense SC generation and its applications in air.

关键词： intense repetition light

Pulse repetition rate effect on the plasma inside femtosecond laser filament in air

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Optics Letters 2024年第1期22卷 135-140页

作者：尹富康王铁军刘尧香龙娟魏迎霞朱斌周凯南冷雨欣 State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory China Academy of Engineering PhysicsMianyang 621999China

The characteristics of plasmas play an important role in femtosecond laser filament-based *** analysis is used to experimentally investigate the plasma density and its temperature of the air filament under different pulse repetition *** our experiments,the measured average plasma density of the filament is 1.54×10^(17)cm^(-3)and the temperature of the plasma is about 5100 K under 100 Hz pulse repetition *** plasma density decreases to1.43×10^(17)cm^(-3)and the temperature increases to 6230 K as the pulse repetition rate increases to 1000 *** experimental observation agrees with the numerical simulation by solving the nonlinear Schr?dinger equations with repetition rate related“low density hole”correction.

关键词： femtosecond laser filamentation cumulative effects electron density

Verification of a Modified Nonhydrostatic Global Spectral Dynamical Core Based on the Dry-Mass Vertical Coordinate: Three-Dimensional Idealized Test Cases

在线全文

学校读者我要写书评

暂无评论

Journal of Meteorological Research 2023年第3期37卷 286-306页

作者： Jun PENG Jianping WU Xiangrong YANG Jun ZHAO Weimin ZHANG Jinhui YANG fukang yin College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410073

The newly developed nonhydrostatic(NH)global spectral dynamical core is evaluated by using three-dimensional(3D)benchmark tests with/without *** new dynamical core differs from the original Aladin-NH like one in the combined use of a dry-mass vertical coordinate and a new temperature variable,and thus,it inherently conserves the dry air mass and includes the mass sink effect associated with precipitation *** 3D dry benchmark tests are first conducted,including steady state,dry baroclinic waves,mountain waves in non-sheared and sheared background flows,and a dry Held–Suarez *** results from these test cases demonstrate that the present dynamical core is accurate and robust in applications on the sphere,especially for addressing the nonhydrostatic ***,three additional moist test cases are conducted to further explore the improvement of the new dynamical ***,in contrast to the original Aladin-NH like one,the new dynamical core prefers to obtain simulated tropical cyclone with lower pressure,stronger wind speeds,and faster northward movement,which is much closer to the results from the Model for Prediction Across Scales(MPAS),and it also enhances the updrafts and provides enhanced precipitation rate in the tropics,which partially compensates the inefficient vertical transport due to the absence of the deep convection parameterization in the moist Held–Suarez test,thus demonstrating its potential value for full-physics global NH numerical weather prediction application.

关键词： nonhydrostatic global spectral dynamical core idealized tests mountain waves tropical cyclone

Pulse repetition-rate effect on the intensity inside a femtosecond laser filament in air

在线全文

学校读者我要写书评

暂无评论

高功率激光科学与工程:英文版 2023年第4期11卷 17-24页

作者： fukang yin Juan Long Yaoxiang Liu yingxia Wei Bin Zhu Kainan Zhou Tie-Jun Wang Yuxin Leng Ruxin Li State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghaiChina Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijingChina Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory China Academy of Engineering PhysicsMianyangChina

As intense,ultrashort,kHz-repetition-rate laser systems become commercially available,pulse cumulative effects are critical for laser filament-based *** this work,the pulse repetition-rate effect on femtosecond laser filamentation in air was investigated both numerically and *** pulse repetition-rate effect has negligible influence at the leading edge of the *** intensity enhancement from a high-repetition pulse is observed at the peak and tailing edge of the laser *** the repetition rate of the laser pulses increases from 100 to 1000 Hz,the length of the filament extends and the intensity inside the filament increases.A physical picture based on the pulse repetition-rate dependent‘low-density hole’effect on filamentation is proposed to explain the obtained results well.

关键词： clamping intensity cumulative effects femtosecond laser filamentation

Time-resolved measurements of electron density and plasma diameter of 1 kHz femtosecond laser filament in air

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2022年第9期20卷 73-78页

作者： Hengyi Zheng fukang yin Tie-Jun Wang Yaoxiang Liu yingxia Wei Bin Zhu Kainan Zhou Yuxin Leng State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine Mechanics and CAS Center for Excellence in Ultra-intense Laser ScienceChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Laser Fusion Research Center and Science&Technology on Plasma Physics Laboratory China Academy of Engineering PhysicsMianyang 621999China

The temporal evolutions of electron density and plasma diameter of 1 kHz femtosecond laser filament in air are experimentally investigated by utilizing a pump-probe longitudinal diffraction method.A model based on scalar diffraction theory is proposed to extract the spatial phase shift of the probe pulse from the diffraction patterns by the laser air plasma *** hydrodynamic effect on plasma evolution at 1 kHz filament is included and *** measured initial peak electron density of~10^(18)cm^(-3) in our experimental conditions decays rapidly by nearly two orders of magnitude within200 ***,the plasma channel size rises from 90μm to 120μm as the delay time *** experimental observation is in agreement with numerical simulation results by solving the rate equations of the charged particles.

关键词： femtosecond laser filamentation electron density diffraction

在线全文

学校读者我要写书评

暂无评论

GSM-R在铁路通信中的作用

中国铁路 2006年第6期 12-14页

作者：尹福康铁道部经济规划研究院技术标准所副所长高级工程师北京100038

GSM-R 是欧洲铁路联盟(UIC)在 TDMA 数字移动通信中引入特殊寻址方式和高级语音呼叫业务而形成的技术体制。铁道部决定采用欧洲 GSM—R作为我国铁路移动通信体制,并根据我国铁路行车密度高、运输组织复杂等特点,引进通用分组无线业务子... 详细信息

GSM-R 是欧洲铁路联盟(UIC)在 TDMA 数字移动通信中引入特殊寻址方式和高级语音呼叫业务而形成的技术体制。铁道部决定采用欧洲 GSM—R作为我国铁路移动通信体制,并根据我国铁路行车密度高、运输组织复杂等特点,引进通用分组无线业务子系统(GPRS),与既有线调度通信系统相结合。GSM-R 能够在一个综合平台上提供丰富的综合调度通信业务,特别是能够为列车控制提供无线数据传输,具有强大的调度功能。

关键词：铁路无线通信数字移动通信调度通信系统 GSM-R

Polarization dependent clamping intensity inside a femtosecond filament in air

在线全文

学校读者我要写书评

暂无评论

Chinese Optics Letters 2021年第10期19卷 97-102页

作者： Hao Guo Xiang Dong Tie-Jun Wang Xuan Zhang Na Chen fukang yin Yihai Wang Lingang Zhang Haiyi Sun Jun Liu Jiansheng Liu Baifei Shen Olga Kosareva Yuxin Leng Ruxin Li State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of SciencesBeijing 100049China Department of Physics College of Arts and ScienceUniversity of Colorado BoulderBoulderCO 80309USA College of Physics Guizhou UniversityGuiyang 550025China Department of Physics Shanghai Normal UniversityShanghai 200234China Physics Faculty Lomonosov Moscow State UniversityMoscow 119991Russia

Laser polarization and its intensity inside a filament core play an important role in filament-based ***,polarization dependent clamping intensity inside filaments has been overlooked to interpret the polarization-related filamentation ***,we report on experimental and numerical investigations of polarization dependent clamping intensity inside a femtosecond filament in *** adjusting the initial polarization from linear to circular,the clamping intensity is increased by 1.36 times when using a 30 cm focal length lens for *** results indicate that clamping intensity inside the filament is sensitive to laser polarization,which has to be considered to fully understand polarizationrelated phenomena.

关键词： femtosecond laser filamentation clamping intensity polarization

在线全文

学校读者我要写书评

暂无评论

中国铁路GSM-R技术发展状况

中国铁路 2005年第3期 34-36页

作者：尹福康铁道部运输局基础部处长北京100844

介绍欧洲GSM-R的发展状况以及对我国GSM-R技术发展的影响;阐述中国GSM-R技术发展思路、标准体系及当前进展情况。

关键词：中国铁路建设 GSM-R技术网络标准通信系统

Solving Linear PDEs with the Aid of Two-Dimensional Legendre Wavelets

在线全文

学校读者我要写书评

暂无评论

Solving Linear PDEs with the Aid of Two-Dimensional Legendre...

2012 National Conference on Information Technology and Computer Science

作者： fukang yin School of computer National University of defense technology Changsha China Junqiang Song School of computer National University of defense technology Changsha China

In this paper,we develop a method,which using twodimensional Legendre wavelets,to solve linear *** on the properties of shifted Legendre polynomials,we give a brief proof about the general procedure of two-dimensional operational matrices of integration,and then employ aforementioned matrices to find the solution of the *** proposed method is mathematically simple and *** demonstrate the efficiency of the method,two test problems （solution of the diffusion,Poisson） are *** experimental results showed that the accuracy of the method is very high and only need a small number of collocation points.

关键词： two-dimensional Legendre wavelets operational matrix integration PDEs

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

加快铁路GSM-R数字移动通信发展

铁道通信信号 2005年第4期41卷 1-4页

作者：尹福康铁道部运输局基础部通信处

在充分研究我国铁路无线通信技术现状及发展方向的基础上, 提出发展GSM-R是实现中国铁路运输指挥手段现代化的重要部分。对今后一个时期GSM-R工程建设工作进行了部署。

关键词： GSM-R 通信发展数字无线通信技术中国铁路运输发展方向建设工作现代化