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Consecutive narrow and broad quasi-periodic fast-propagating wave trains associated with a flare

Science China(Physics,Mechanics & Astronomy) 2024年第5期67卷 200-211页

作者： Xinping Zhou Yuandeng Shen Chengrui Zhou Zehao Tang Ahmed Ahmed Ibrahim College of Physics and Electronic Engineering Sichuan Normal UniversityChengdu 610068China State Key Laboratory of Space Weather Chinese Academy of SciencesBeijing 100190China Yunnan Observatories Chinese Academy of SciencesKunming 650216China Department of Physics and Astronomy College of ScienceKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia

The excitation mechanism of coronal quasi-period fast-propagating(QFP)wave trains remains unresolved.Using Atmospheric Imaging Assembly onboard the Solar Dynamics Observatory observations,we study a narrow and a broad QFP wave trains excited one after another during the successive eruptions of filaments hosted within a fan-spine magnetic system on October 20,2013.The consecutive occurrence of these two types of QFP wave trains in the same event provides an excellent opportunity to explore their excitation mechanisms and compare their physical parameters.Our observational results reveal that narrow and broad QFP wave trains exhibit distinct speeds,periods,energy fluxes,and relative intensity amplitudes,although originating from the same active region and being associated with the same GOES C2.9 flare.Using wavelet analysis,we find that the narrow QFP wave train shares a similar period with the flare itself,suggesting its possible excitation through the pulsed energy release in the magnetic reconnection process that generated the accompanying flare.On the other hand,the broad QFP wave train appears to be associated with the energy pulses released by the successive expansion and unwinding of filament threads.Additionally,it is plausible that the broad QFP wave train was also excited by the sequential stretching of closed magnetic field lines driven by the erupting filament.These findings shed light on the different excitation mechanisms and origins of the QFP wave trains.

关键词： narrow wave excitation

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A commentary of“Discovery of an extremely narrow jet and 10 teraelectronvolt photons from the brightest-of-all-time gamma-ray burst”:Top 10 Scientific Advances of 2023,China

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Fundamental Research 2024年第3期4卷 704-705页

作者： Renxin Xu State Key Laboratory of Nuclear Physics and Technology School of PhysicsPeking UniversityBeijing 100871China

In the past hundred years since 1900,with some sorts of fundamental symmetry,the combination of quantum theory and special relativity is successful in establishing the“standard model of particle physics”.In this era of multi-messenger astronomy(encompassing full electromagnetic waves,neutrinos,cosmic rays,and gravitational waves),it becomes increasingly important to explore the physics in strong gravity,which involves the integration of the standard model and the general relativity.The mystery of powerful and brief flashes ofγ-rays,called gamma-ray bursts(GRBs),is one of such issues,often involving the birth of black holes and neutron stars.LHAASO(Large High Altitude Air Shower Observatory).

关键词： narrow establishing symmetry

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Light-controlled soft bio-microrobot

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Light(Science & Applications) 2024年第3期13卷 531-543页

作者： Jianyun Xiong Xing Li Ziyi He Yang Shi Ting Pan Guoshuai Zhu Dengyun Lu Hongbao Xin Guangdong Provincial Key Laboratory of Nanophotonic Manipulation Institute of NanophotonicsJinan University511443 GuangzhouChina

Micro/nanorobots hold exciting prospects for biomedical and even clinical applications due to their small size and high controllability.However,it is still a big challenge to maneuver micro/nanorobots into narrow spaces with high deformability and adaptability to perform complicated biomedical tasks.Here,we report a light-controlled soft bio-microrobots(called“Ebot”)based on Euglena gracilis that are capable of performing multiple tasks in narrow microenvironments including intestinal mucosa with high controllability,deformability and adaptability.The motion of the Ebot can be precisely navigated via light-controlled polygonal flagellum beating.Moreover,the Ebot shows highly controlled deformability with different light illumination duration,which allows it to pass through narrow and curved microchannels with high adaptability.With these features,Ebots are able to execute multiple tasks,such as targeted drug delivery,selective removal of diseased cells in intestinal mucosa,as well as photodynamic therapy.This light-controlled Ebot provides a new bio-microrobotic tool,with many new possibilities for biomedical task execution in narrow and complicated spaces where conventional tools are difficult to access due to the lack of deformability and bio-adaptability.

关键词： narrow illumination curved

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Neutrophils in the tumor microenvironment-when a company becomes a crowd

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Cellular & Molecular Immunology 2024年第4期21卷 313-314页

作者： Zvi G.Fridlender Zvi Granot Faculty of Medicine Hebrew University of JerusalemJerusalemIsrael Institute of Pulmonary Medicine Hadassah-Hebrew University Medical Center91120 JerusalemIsrael Department of Developmental Biology and Cancer Research Institute for Medical Research Israel CanadaFaculty of MedicineHebrew University91120 JerusalemIsrael

Traditionally,neutrophils are perceived as terminally differentiated cells with defined functions and limited plasticity.It is commonly believed that circulating,marginating and tissue-infiltrating neutrophils belong to the same homogeneous population and are capable of switching between these locations.Neutrophil research has stagnated since the early 1980s,maintaining a narrow and simplistic view of their capabilities.

关键词： narrow infiltrating differentiated

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Extremely narrow resonant linewidths in metal-dielectric heterostructures

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Photonics Research 2022年第7期10卷 1754-1762页

作者： JIE ZHENG JINFENG ZHU ZHILIN YANG Department of Physics Collaborative Innovation Center for Optoelectronic Semiconductors and Efficient DevicesJiujiang Research InstituteXiamen UniversityXiamen 361005China Laboratory of Micro-Nano Optics School of Physics and Electronic EngineeringSichuan Normal UniversityChengdu 610101China Department of Electronic Science Xiamen UniversityXiamen 361005China

Plasmonic high-quality factor resonators with narrow surface plasmon resonance(SPR)linewidths are extremely significant for surface-enhanced Raman scattering,optical sensors,imaging,and color filters.Unfortunately,extensive research on narrowing SPR linewidths is mainly based on noble metal nanostructures that are restricted by intrinsic loss.Here,heterostructures consisting of metal and dielectric metaphotonics are experimentally designed and fabricated for elaborating SPR linewidths.The results demonstrate that the SPR linewidths can be narrowed by 66.7%relative to that of aluminum nanostructures.The resonant linewidths are directly shrunk due to the interaction between low loss in the semiconductor nanostructures and electromagnetic confinement in the metal counterparts.Meanwhile,the resonant wavelength governed by heterostructure configurations shifts from600 to 930 nm.This work will pave an avenue toward controlling resonant linewidths of metaldielectric heterostructures for numerous applications.

关键词： narrow resonant dielectric

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Priceless Lessons

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ChinAfrica 2024年第6期16卷 56-57页

作者： SINAZO MAZOMBA 不详

I am a passionate and dedicated teacher who embarked on a life-changing journey to Xiamen to teach students in a foreign land.With a heart full of enthusiasm and a mind brimming with knowledge,I embraced the challenges and rewards of teaching in a new cultural setting.Xiamen,a vibrant coastal city in southeastern China,welcomed me with its bustling streets,traditional architecture,and warm hospitality.As I navigated the city’s narrow alleys and busy markets,I marvelled at the blend of modernity and ancient traditions that defined Xiamen’s unique charm.

关键词： Xiamen narrow southeastern

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NETIZEN WATCH

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China Weekly 2024年第7期 12-13页

Since May,a new aesthetic has taken Chinese social media by storm that netizens say both celebrates and stigmatizes rural life.Characterized by its distinctive photographic style,“small-town literature”oftendepicts palegrayskies,narrow streets,run-down buildings and rusty window bars.The subjects are typically melancholic young individuals:a woman in a plain.

关键词： individual typically narrow

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narrow band imaging and white light endoscopy in the characterization of a polypectomy scar:A single-blind observational study

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World Journal of Gastroenterology 2018年第45期24卷 5179-5188页

作者： Fausto Riu Pons Montserrat Andreu Javier Gimeno Beltran Marco Antonioálvarez-Gonzalez Agustín Seoane Urgorri Josep Maria Dedeu Luis Barranco Priego Xavier Bessa Gastroenterology Department Hospital del MarBarcelona 08003Spain IMIM(Hospital del Mar Medical Research Institute) Barcelona 08003Spain Department of Medicine Autonomous University of BarcelonaBarcelona 08003Spain Pompeu Fabra University Barcelona 08003Spain Pathology Department Hospital del MarBarcelona 08003Spain.

AIM To assess the incremental benefit of narrow band imaging(NBI) and white light endoscopy(WLE), randomizing the initial technique for the detection of residual neoplasia at the polypectomy scar after an endoscopic piecemeal mucosal resection(EPMR).METHODS We conducted an observational study in an academic center to assess the incremental benefit of NBI and WLE randomly applied 1:1(NBI-WLE or WLE-NBI) in the follow-up of a post-EPMR scar by the same endoscopist.RESULTS A total of 112 EPMR scars were included. The median baseline polyp size was 20 mm(interquartile range: 14-30). At first review, NBI and WLE showed good sensitivity(85.0% vs 78.9%), specificity(77.1% vs 84.2%) and overall accuracy(80.0% vs 82.5%). NBI after WLE(WLE-NBI group) improved accuracy, but this difference was not statistically significant [area under the curve(AUC): 86.8% vs 81.6%, P = 0.15]. WLE after NBI(NBI-WLE group) did not improve accuracy(AUC: 81.4% vs 81.1%, P = 0.9). Overall, recurrence was found in 39/112(34.8%) lesions.CONCLUSION Although no statistically significant differences were found between the two techniques at the first postEPMR assessment, the use of NBI after WLE may improve residual neoplasia detection. Nevertheless, biopsy is still required in the first scar review.

关键词： Colonoscopy narrow band imaging Endoscopic mucosal resection

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A new 3D cupric coordination polymer as chemiresistor humidity sensor:narrow hysteresis,high sensitivity,fast response and recovery

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Science China Chemistry 2017年第9期60卷 1197-1204页

作者： Xiao-Jing Lv Ming-Shui Yao Guan-E Wang Yan-Zhou Li Gang Xu State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of Sciences University of Chinese Academy of Sciences Chinese Academy of Sciences

A new three-dimensional coordination polymer composed of Cu^(2+) centres and semiquinoid linkers(dhbq^(2-)) was synthesized which was composed by two independent,enantiomeric,interpenetrated[Cu_2(dhbq)_3]^(2-) networks with(10,3)-a topology.The compound has good water stability and typical behaviors of semiconductor,whose conductivity increases along with raising temperature.The chemiresistive humidity sensor made from this material shows good properties including linear sensitivity,high response,fast response and recovery,and particularly narrow hysteresis during humidity adsorption and

关键词： coordination polymer, chemiresistive humidity sensor, narrow hysteresis, fast response & recovery

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Surrounding rock control of gob-side entry driving with narrow coal pillar and roadway side sealing technology in Yangliu Coal Mine

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International Journal of Mining Science and Technology 2017年第5期27卷 819-823页

作者： Zha Wenhua Shi Hao Liu San Kang Changhao Key Laboratory of Safe and Effective Coal Mining School of Mining and Safety EngineeringAnhui University of Science&TechnologyMinistry of EducationHuainan 232001China

Gob-side entry driving can increase coal recovery ratio, and it is implied in many coal mines. Based on geological condition of 10416 working face tailentry in Yangliu Coal Mine, the surrounding rock deformation characteristics of gob-side entry driving with narrow coal pillar is analysed, reasonable size of coal pillar and reasonable roadway excavation time after mining are achieved. Surrounding rock control technology and effective roadway side sealing technology are proposed and are taken into field practice. The results showed that a safer and more efficient mining of working face can be achieved. In addition, results of this paper also have important theoretical significance and valuable reference for surrounding rock control technology of gob-side entry driving with narrow coal pillar under special geological condition.

关键词： narrow coal pillar Gob-side entry driving Surrounding rock control Roadway side sealing technology

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