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Multiple-Photon Resonance Enabled Quantum Interference in Emission Spectroscopy of N2+

Ultrafast Science 2024年第2期4卷 1-7页

作者： Xiang Zhang Qi Lu YaLei Zhu Jing Zhao Rostyslav Danylo Liang Xu Mingwei Lei Hongbing Jiang chengyin wu Zhedong Zhang Aurélien Houard Vladimir Tikhonchuk AndréMysyrowicz Qihuang Gong Songlin Zhuang Zengxiu Zhao Yi Liu Shanghai Key Lab of Modern Optical System University of Shanghai for Science and Technology.516Jungong Road200093 ShanghaiChina Department of Physics National University of Defense TechnologyChangsha 410073China Laboratoire d'Optique Appliquee ENSTA ParisEcole Polytechnique CNRSInstitut Polytechnique de Paris828 Boulevard des Marechaux91762 Palaiseau CedexFrance State Key Laboratory for Mesoscopic Physics School of PhysicsPeking UniversityBejing 100871China Department of Physics City University of Hong KongKowloonHong Kong SAR Centre Lasers Intenses et Applications University of Bordeaux-CNRS-CEA351 Cours de la Liberation33405 Talence Cedex France Extreme Light Infrastructure ERIC ELI Beamlines Facility25241 Doln BrezanyCzech Republic CAS Center for Excellence in Ultra-intense Laser Science Shanghai 201800China

Quantum interference occurs frequently in the interaction of laser radiation with materials,leading to a series of fascinating effects such as lasing without inversion,electromagnetically induced transparency,Fano resonance,*** quantum interference effects are mostly enabled by single-photon resonance with transitions in the matter,regardless of how many optical frequencies are ***,we report on quantum interference driven by multiple photons in the emission spectroscopy of nitrogen ions that are resonantly pumped by ultrafast infrared laser *** the spectral domain,Fano resonance is observed in the emission spectrum,where a laser-assisted dynamic Stark effect creates the *** the time domain,the fast-evolving emission is measured,revealing the nature of free-induction decay arising from quantum radiation and molecular *** findings clarify the mechanism of coherent emission of nitrogen ions pumped with mid-infrared pump laser and are found to be *** present work opens a route to explore the important role of quantum interference during the interaction of intense laser pulses with materials near multiple photon resonance.

关键词： pumped pump Quantum

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下肢外骨骼机器人联合传统康复训练对脑卒中患者步行功能恢复的疗效观察

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昆明医科大学学报 2024年第7期45卷 92-98页

作者：李豫朱琳陈科容李依余忠祥吴成银施红伶云南省第三人民医院康复医学科云南昆明650011

目的探究下肢外骨骼机器人联合康复训练对卒中后偏瘫患者下肢功能恢复情况的疗效。方法选取云南省第三人民医院康复医学科2023年1月至2024年2月收治的36例卒中后下肢偏瘫患者为研究对象,随机分为对照组(n=18)和观察组(n=18)。对照组予... 详细信息

目的探究下肢外骨骼机器人联合康复训练对卒中后偏瘫患者下肢功能恢复情况的疗效。方法选取云南省第三人民医院康复医学科2023年1月至2024年2月收治的36例卒中后下肢偏瘫患者为研究对象,随机分为对照组(n=18)和观察组(n=18)。对照组予以传统康复治疗,观察组在传统康复治疗的基础上予以下肢外骨骼机器人训练,训练前及训练后2周评估患者下肢肌力(髂腰肌、股四头肌、腘绳肌、小腿三头肌、胫骨前肌);下肢运动能力:功能性步行能力量表(FAC)、10 m步行试验(10MWT)、步态分析(Tinetti评分);日常生活能力:ADL评估量表。用近红外功能成像对2名卒中后下肢偏瘫患者及2名健康志愿者运动状态下脑功能进行监测。结果训练2周后,观察组及对照组所有患者下肢功能均有改善。观察组髂腰肌肌力(P<0.01)、股四头肌(P<0.01)、腘绳肌(P<0.01);小腿三头肌(P<0.005),胫骨前肌(P<0.005)肌力较治疗前改善,差异具有统计学意义。观察组和对照组下肢运动能力均得到改善:功能性步行能力量表(FAC)得分提高(P<0.01)、10 m步行试验(10MWT)时间缩短(P<0.01)、步态分析(Tinetti评分)得分提高(P<0.01)。观察组和对照组日常生活能力(ADL评分)均有提高(P<0.01)。近红外脑功能成像实时监测,在外骨骼机器人步行运动状态下,观察到卒中后偏瘫患者2侧大脑半球脑网络连接强度较健康志愿者降低。结论2组治疗方案均有助于改善患者下肢功能,传统康复联合下肢外骨骼机器人联合康复训练对卒中后偏瘫患者下肢肌力及生活质量的改善更显著;增强2侧大脑半球的脑网络连接可能是促进偏瘫患者肢体功能恢复的潜在靶点。

关键词：脑卒中外骨骼机器人偏瘫近红外功能成像

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Magnetic field stabilization system designed for the cold-atom coherent population-trapping clock

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Chinese Optics Letters 2024年第8期22卷 7-12页

作者： Chang Zhan Zhu Ma Jiatao wu Maojie Li chengyin Han Bo Lu Chaohong Lee Laboratory of Quantum Engineering and Quantum Metrology School of Physics and AstronomySun Yat-sen UniversityZhuhai 519082China Institute of Quantum Precision Measurement State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen UniversityShenzhen 518060China College of Physics and Optoelectronic Engineering Shenzhen UniversityShenzhen 518060China Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area Shenzhen 518045China

Accurate control of magnetic fields is crucial for cold-atom experiments,often necessitating custom-designed control systems due to limitations in commercially available power ***,we demonstrate precise and flexible control of a static magnetic field by employing a field-programmable gate array and a feedback *** setup enables us to maintain exceptionally stable current with a fractional stability of 1 ppm within 30 *** error signal of the feedback loop exhibited a noise level of 10~(-5)A·Hz~(-1/2)for control bandwidths below 10 k *** this precise magnetic field control system,we investigate the second-order Zeeman shift in the context of cold-atom coherent population-trapping (CPT)*** analysis reveals the second-order Zeeman coefficient to be 574.21 Hz/G~2,with an uncertainty of 1.36 Hz/G~***,the magnetic field stabilization system we developed allows us to achieve a second-order Zeeman shift below10~(-14),surpassing the long-term stability of current cold-atom CPT clocks.

关键词： cold-atom coherent population-trapping clock Zeeman coefficient magnetic field stabilization system

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飞秒激光驱动的分子库仑爆炸研究

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中国科学：物理学、力学、天文学 2017年第3期47卷 23-31页

作者：樊亚萌吴成印北京大学物理学院量子物质科学协同创新中心人工微结构与介观物理国家重点实验室北京100871 山西大学极端光学协同创新中心太原030006

飞秒强激光作用下,分子发生多电荷电离,产生高价分子离子.由于电荷间的库仑排斥作用,高价分子离子会发生库仑爆炸,生成的碎片离子具有较大平动能量.本文结合在北京大学开展的飞秒强场分子库仑爆炸研究,介绍了飞秒强激光驱动的分子库仑... 详细信息

飞秒强激光作用下,分子发生多电荷电离,产生高价分子离子.由于电荷间的库仑排斥作用,高价分子离子会发生库仑爆炸,生成的碎片离子具有较大平动能量.本文结合在北京大学开展的飞秒强场分子库仑爆炸研究,介绍了飞秒强激光驱动的分子库仑爆炸的重要进展、潜在应用和未来发展方向.

关键词：飞秒激光符合测量库仑爆炸分子结构成像反应动力学

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F_2,F与I_2的化学发光反应

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化学学报 1998年第9期56卷 914-919页

作者：吴成印储焰南曹德兆中国科学院安徽光学精密机械研究所激光光谱学开放实验室合肥230031

在流动余辉实验装置上，研究了Ｆ２，Ｆ与Ｉ２的化学发光反应，首次在Ｆ＋Ｉ２反应体系中观察到较强的ＩＦ（Ｂ→Ｘ）发射光谱，采用简单碰撞理论地ＩＦ（Ｂ）的振动驰豫进行估算后，得到了其振动布居，发现与Ｆ２＋Ｉ２反应体系中有明... 详细信息

在流动余辉实验装置上，研究了Ｆ２，Ｆ与Ｉ２的化学发光反应，首次在Ｆ＋Ｉ２反应体系中观察到较强的ＩＦ（Ｂ→Ｘ）发射光谱，采用简单碰撞理论地ＩＦ（Ｂ）的振动驰豫进行估算后，得到了其振动布居，发现与Ｆ２＋Ｉ２反应体系中有明显不同的，从而推测这两个反应的激发态产物ＩＦ（Ｂ）是由不同的反应通道形成的，前者由初级反应产物Ｉ２Ｆ与Ｆ原子进一步作用产生。

关键词：流动余辉化学激光介质化学发光反应氟碘

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kHz脉冲分子束的产生及其在强场原子分子物理实验中的应用

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北京大学学报（自然科学版） 2015年第4期51卷 591-595页

作者：许少华王鹏杨宏吴成印北京大学物理学院人工微结构与介观物理国家重点实验室北京100871 量子物质科学协同创新中心北京100871

采用悬臂压电脉冲阀,制备出最高重复频率达到3 k Hz的脉冲分子束。通过测量氮气分子束在飞秒激光作用下隧道电离生成的N2+(B-X)荧光光谱,对脉冲阀的性能做了表征。这种k Hz脉冲分子束搭配k Hz飞秒激光器,将推动飞秒强激光驱动的原子分... 详细信息

采用悬臂压电脉冲阀,制备出最高重复频率达到3 k Hz的脉冲分子束。通过测量氮气分子束在飞秒激光作用下隧道电离生成的N2+(B-X)荧光光谱,对脉冲阀的性能做了表征。这种k Hz脉冲分子束搭配k Hz飞秒激光器,将推动飞秒强激光驱动的原子分子动力学实验研究。

关键词：脉冲分子束高重复频率飞秒激光隧道电离荧光光谱

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Ballistic performances of the hourglass lattice sandwich structures under high-velocity fragments

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Defence Technology（防务技术） 2024年第1期31卷 312-325页

作者： He-xiang wu Jia Qu Lin-zhi wu Key Laboratory of Advanced Ship Materials and Mechanics College of Aerospace and Civil EngineeringHarbin Engineering UniversityHarbin150001China School of Civil Engineering Northeast Forestry UniversityHarbin150040China

In this paper,the numerical simulation method is used to study the ballistic performances of hourglass lattice sandwich structures with the same mass under the vertical incidence of *** is paid to elucidating the influences of rod cross-section dimensions,structure height,structure layer,and rod inclination angle on the deformation mode,ballistic performances,and ability to change the ballistic direction of *** results show that the ballistic performances of hourglass lattice sandwich structures are mainly affected by their structural *** this respect,structural parameters optimization of the hourglass lattice sandwich structures enable one to effectively improve their ballistic limit velocity and,consequently,ballistic performances.

关键词： Hourglass lattice sandwich structures Ballistic performances high-velocity Finite element analysis

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Resilience-incorporated seismic risk assessment of precast concrete frames with“dry”connections

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Earthquake Engineering and Engineering Vibration 2024年第2期23卷 403-425页

作者： wu Chenhao Tang Yuchuan Cao Xuyang wu Gang Key Laboratory of Concrete and Prestressed Concrete Structures of the Ministry of Education Nanjing 211102China Department of Civil and Environmental Engineering University of CaliforniaLos AngelesCA 90095USA School of Civil Engineering Southeast UniversityNanjing 211102China College of Civil and Transportation Engineering Hohai UniversityNanjing 210024China

A resilience-incorporated risk assessment framework is proposed and demonstrated in this study to manifest the advantageous seismic resilience of precast concrete frame(PCF)structures with“dry”connections in terms of their low damage and rapid *** framework integrates various uncertainties in the seismic hazard,fragility,capacity,demand,loss functions,and post-earthquake *** this study,the PCF structures are distinguished from ordinary reinforced concrete frame(RCF)structures by characterizing multiple limit states for the PCF based on its unique damage ***,probabilistic story-wise pushover analyses are performed to yield story-wise capacities for the predefined limit *** the seismic resilience analysis,a step-wise recovery model is proposed to idealize the functionality recovery process,with separate considerations of the repair and non-repair *** recovery model leverages the economic loss and downtime to delineate the stochastic post-earthquake recovery curves for the resilience loss *** such,contingencies in the probabilistic post-earthquake repairs are incorporated and the empirical judgments on the recovery parameters are largely *** proposed framework is demonstrated through a comparative study between two“dry”connected PCFs and one RCF designed as alternative structural systems for a prototype *** results from the risk quantification indicate that the PCFs show reduced loss hazards and lower expected losses relative to the ***,the PCF equipped with energy dissipation devices at the“dry”connections largely reduces the expected economic loss,downtime,and resilience loss by 29%,56%,and 60%,respectively,compared to the RCF.

关键词： precast concrete frame non-emulative precast system seismic resilience seismic risk functional recovery

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New findings on the influence of El Nino events on tropical cyclone formation

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Science China Earth Sciences 2024年第3期67卷 892-893页

作者： Liguang wu Department of Atmospheric and Oceanic Sciences Institute of Atmospheric SciencesFudan UniversityShanghai 200438China

Tropical cyclones typically form over warm tropical and subtropical ocean surfaces, as their formation and intensification rely primarily on the energy provided by the ocean. Pioneering research by Gray (1968) revealed that the formation of tropical cyclones requires the sea surface temperature (SST) to be no less than 26.5℃. Consequently, SST is commonly recognized as a crucial parameter among the environmental factors influencing tropical cyclone formation(Gray, 1979;Emanuel and Nolan, 2004).

关键词： tropical cyclone ocean

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Two-dimensional semiconductor heterostructures for photocatalytic CO_(2)conversion

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Science China Chemistry 2024年第8期67卷 2434-2447页

作者： Yang wu Mingyu wu Yongfu Sun Yi Xie Hefei National Research Center for Physical Sciences at Microscale University of Science and Technology of ChinaHefei 230026China

The CO_(2)reduction into carbon-contained fuel via solar energy offers the powerful tools to realize the zero-emission carbon *** to the intriguing features of the two-dimensional(2D)heterostructures,it is susceptible to modulate the electronic structure as well as the surface geometry for optimizing the photocatalytic CO_(2)*** this perspective,we surveyed the fundamental insights of 2D semiconductor heterostructures,involving the fabrication strategies and classification of the 2D semiconductor ***,we have detailly discussed the overview of 2D semiconductor heterostructure for optimizing CO_(2)photocatalytic influenced factors,including the solar energy utilization,photogenerated carriers separation,and redox reaction ***,we showed the significant advantages of 2D heterostructures in elevating CO_(2)photoreduction performance,focusing on activity,selectivity and *** analyzing the limitations and developments,we ended by putting forward insights into the further researches about the CO_(2)photocatalysts and reactor design,even industrial applications.

关键词： two-dimensional semiconductor heterostructures photocatalysis CO_(2)conversion

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