检索结果-南通市图书馆

Effect of pulse duration on generation of attosecond pulse with coherent wake emission

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第11期30卷 352-357页

作者： Siyu Chen Zhinan Zeng ruxin li School of Physical Science and Technology ShanghaiTech UniversityShanghai 201210China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China

High-order harmonics and attosecond pulse generation with coherent wake emission are theoretically investigated for the effect of pulse duration and carrier envelope phase(CEP)of few-cycle laser *** find that short pulse duration will cause the negative chirp for the high *** the laser pulse is shortened to a few cycles,the influence of the laser CEP on the chirp of the harmonics will also become more prominent.

关键词： coherent wake emission carrier envelope attosecond pulse high-order harmonics

Goldilocks focal zone in femtosecond laser ignition of lean fuels

在线全文

学校读者我要写书评

暂无评论

Science China(Technological Sciences) 2022年第7期65卷 1537-1544页

作者： ZANG HongWei li HeLong liANG TianFeng CHEN ShanMing ZHANG Wei FU Yao XU Huailiang li ruxin State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China Institute of Atomic and Molecular Physics Jilin UniversityChangchun 130012China CAS Center for Excellence in Ultra-Intense Laser Science Shanghai 201800China State Key Laboratory of High Field Laser Physics Shanghai Institute of Optics and Fine MechanicsCASShanghai 201800China School of Physical Science and Technology Shanghai Tech UniversityShanghai 201210China

Laser ignition of lean fuels offers a promising route for green combustion with high combustion efficiency and low exhaust emissions. The fundamental limitations which apply to femtosecond laser ignition(fs-li) of lean fuels are the inferior energy deposition and low thermodynamic temperature. However, it was discovered recently that the fs laser filamentation can induce 100% success rate of fs-li with ultralow sub-m J minimum ignition energy, exhibiting distinct contrast to the general understanding that it is hard to achieve fs-li. The present contribution examines the extent to which the minimum ignition energies depend on filamentation formation, and explores the key factors for the success of fs-li. We perform fs-li of a lean-fuel CH;/air mixture using a femtosecond near-infrared(~40 fs, 800 nm) pulse at different external focal conditions, and find a Goldilocks focal zone to facilitate fs-li. In this special zone, a crucial balance between the length of igniting “line” kernel and the plasma density of the fs laser filament is achieved, which determines not only the total amount of resultant OH radicals, but also their distribution along the plasma filament. Our finding provides a viable strategy with clear guidelines for fs-li, and also opens up an avenue of exploring unprecedented ultrafast ignition dynamics after fs-laser-fuel interactions towards gaining deeper insights into reaction intermediates and combustion processes.

关键词： femtosecond laser laser ignition lean fuels laser filament laser spectroscopy

同方期刊数据库

Robust and ultralow-energy-threshold ignition of a lean mixture by an ultrashort-pulsed laser in the filamentation regime

在线全文

学校读者我要写书评

暂无评论

light(Science & Applications) 2021年第3期10卷 320-326页

作者： Hongwei Zang Helong li Wei Zhang Yao Fu Shanming Chen Huailiang Xu ruxin li State Key Laboratory of Integrated Optoelectronics College of ElectronicScience and EngineeringJilin University130012 ChangchunChina Instituteof Atomic and Molecular Physics Jilin University130012 ChangchunChina CAS Center for Excellence in Ultra-intense Laser Science 201800 ShanghaiChina State Key Laboratory of High Field Laser Physics Shanghai lnstitute of Optics and Fine MechanicsChinese Academy of Sciences201800 ShanghaChina School of Physical Science and Technology ShanghaiTech University201210 ShanghaiChina

Laser ignition(li)allows for precise manipulation of ignition tinning and location and is promising for green combustion of automobile and rocket engines and aero-turbines under lean-fuel conditions with improved emission efficiency;however,achieving completely effective and reliable ignition is still a ***,we report the realization of igniting a lean methane/air mixture with a 100%success rate by an ultrashort femtosecond laser,which has long been regarded as an unsuitable fuel ignition *** demonstrate that the minimum ignition energy can decrease to the sub-mJ level depending on the laser filamentation formation,and reveal that the resultant early OH radical yield significantly increases as the laser energy reaches the ignition threshold,showing a clear boundary for misfire and fire *** mechanisms for robust ultrashort li are the filamentation-induced heating effect followed by exothermal chemical reactions,in combination with the line ignition effect along the *** results pave the way toward robust and efficient ignition of lean-fuel engines by ultrashort-pulsed lasers.

关键词： ultrashort laser energy

Gas-solids separation model of a novel FCC riser terminator device: super short quick separator (SSQS)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Chemical Science and Engineering 2008年第4期2卷 462-467页

作者： Chunxi LU ruxin li Xiancheng liU Mingxian SHI States Key Laboratory of Heavy Oil Processing China University of Petroleum(Beijing)Beijing 102249China Coal to Oil&Chemicals Department Shenhua Group Co.LtdBeijing 100011China

The gas flow field and the separation efficiency of a novel fluid catalytic cracking (FCC) riser terminal device, named as Super Short Quick Separator (SSQS), were studied. On the basis of above investigations, a section-lateral-mixing separation model was proposed, which included both the effect of inertia and structure of gas outlet on particles capture. After final modification, the results predicted with this model could be in good agreement with the cold experimental data. According to this model, the separation efficiency of SSQS is mainly influenced by the difference between the arc radius and the center pipe radius as well as the magnitude of particle tangential velocity.

关键词： fluidized catalytic cracking riser quick sepa-rator separation model

Inducement of Sechenov inhibition by EtOH and NA in the Bufo toad

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 Science Bulletin 2008年第8期53卷 1193-1196页

作者： li ruxin JIA ShanShan li YingZi CAO Yin CHENG XiuZhen XIE ZuoPing Department of Biological Sciences and Biotechnology National State Key Laboratory of Biomembrane and Membrane Biotechnology Tsinghua University Beijing 100084 China Department of Physiology Weifang Medical University Weifang 261042 China

Central inhibition, discovered by Sechenov in 1862, suggests that electrically stimulating the forebrain or medulla oblongata in frog generally suppresses reflexes. However, the underlying molecular mechanisms are still unclear. Using ethanol (EtOH), noradrenalin (NA), and other neurotransmitters in thalamic preparations, Sechenov inhibition was stimulated in Bufo toads in this study. The result showed that, similar to Sechenov inhibition, the acute application of EtOH or NA excited the thalamus and prolonged the latency of withdrawal reflex. Our study evidences the involvement of α-adrenoceptors in such central inhibition, and explains the role of acute EtOH application in the in- duction of reflex inhibition.

关键词：乙醇去甲肾上腺素抑制作用 NA 蟾蜍

Stable,intense supercontinuum light generation at 1 kHz by electric field assisted femtosecond laser filamentation in air

在线全文

学校读者我要写书评

暂无评论

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

Phase-matched high-order harmonics by interaction of Ar atoms with high-repetition-rate low-energy femtosecond laser pulses

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2004年第4期47卷 492-501页

作者： XIE Xinhua ZENG Zhinan li ruxin CHEN Shu LU Haihe YIN Dingjun XU Zhizhan Key Laboratory for High Intensity Optics Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

Phase-matched high-order harmonic generation in Ar gas-filled cell was investigated experimentally. We obtained phase-matched 27th order harmonic driven by a commercially available solid-state femtosecond laser system at 0.55 mJ/pulse energy level and 1 kHz repetition rate. To our knowledge, this is the lowest driving laser energy used to obtain phase-matched 27th order harmonic in a static gas cell. High-order harmonic generation at different gas density was studied systematically. Spectral blueshift and broadening of high harmonics under different pressure were analyzed. We found that the source size and spatial distribution of high-order harmonics are quite different under the phase-matching condition from those of the phase-mismatching case.

关键词： high-order harmonic generation phase matching spectral characteristic spatial distribution

Intense ultraviolet-visible-infrared full-spectrum laser

在线全文

学校读者我要写书评

暂无评论

light(Science & Applications) 2023年第9期12卷 1902-1910页

作者： lihong Hong liqiang liu Yuanyuan liu Junyu Qian Renyu Feng Wenkai li Yanyan li Yujie Peng Yuxin Leng ruxin li Zhi-Yuan li School of Physics and Optoelectronics South China University of TechnologyGuangzhou 510641China State Key Laboratory of High Field Laser Physics and CAS Center for Excellence in Ultra-intense Laser Science Shanghai Institute of Optics and Fine Mechanic Chinese Academy of SciencesShanghai 201800China

A high-brightness ultrabroadband supercontinuum white laser is desirable for various fields of modern ***,we present an intense ultraviolet-visible-infrared full-spectrum femtosecond laser source(with 300–5000 nm 25 dB bandwidth)with 0.54 mJ per *** laser is obtained by sending a 3.9μm,3.3 mJ mid-infrared pump pulse into a cascaded architecture of gas-filled hollow-core fiber,a bare lithium niobate crystal plate,and a specially designed chirped periodically poled lithium niobate crystal,under the synergic action of second and third order nonlinearities such as high harmonic generation and self-phase *** full-spectrum femtosecond laser source can provide a revolutionary tool for optical spectroscopy and find potential applications in physics,chemistry,biology,material science,industrial processing,and environment monitoring.

关键词： pump spectrum ultraviolet

Functional Studies of Castor(Ricinus communis L.)PLC Family Genes in Arabidopsis Inflorescence Development

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2023年第11期92卷 3091-3112页

作者： Yanpeng Wen Rui Luo lili li Xiaotian liang Xuemei Hu ruxin li Zhiyan Wang Fenglan Huang College of life Science and Food Engineering Inner Mongolia University for the NationalitiesTongliao028000China Key Laboratory of Castor Breeding of the State Ethnic Affairs Commission Inner Mongolia University for the NationalitiesTongliao028000China Inner Mongolia Industrial Engineering Research Center of Universities for Castor Inner Mongolia University for the NationalitiesTongliao028000China Inner Mongolia Key Laboratory of Castor Breeding and Comprehensive Utilization Inner Mongolia University for the NationalitiesTongliao028000China Inner Mongolia Engineering Research Center of Industrial Technology Innovation of Castor Inner Mongolia University for the NationalitiesTongliao028000China

Castor(Ricinus communis L.)is one of the top 10 oil crops in the world,and inflorescence is a trait that directly affects its *** C(PLCs)is involved in many plant activities and metabolic *** study the functions of PLC family genes in the regulation of the inflorescence development of the female line of Lm-type castor aLmAB2,we determined the expression levels of six PLC family genes of three types of inflorescences of aLmAB2(isofemale line,female line,bisexual line)at different developmental *** results showed that the 6 genes of the castor PLC family had relative expression levels at different developmental stages of the three types of *** subcellular location of all six protein products was the cell *** six genes were heterologously overexpressed in Arabidopsis thaliana to obtain the T3 generation-resistant Arabidopsis thaliana *** results showed that the overexpression of six genes significantly promoted the maturation of Arabidopsis thaliana,the growth of lateral moss,and the development of flowers and pods,but the development of basal leaves and stem leaves of Arabidopsis thaliana was significantly *** to homology analysis,it is speculated that PLC2,PLC2M,PLC2N,PLC4,PLC4X2,and PLC6 genes have the same regulatory function.

关键词： Castor PLC family genes the female line of Lm-type castor inflorescence development