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Time delay and extended halo for constraints on the intergalactic magnetic field

Research in Astronomy and Astrophysics 2015年第12期15卷 2173-2186页

作者： yuan-pei yang Zi-Gao Dai School of Astronomy and Space Science Nanjing University Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University) Ministry of Education

Primary gamma rays emitted from extragalactic very-high-energy （VHE） sources, such as blazars, will generate cascade radiation in intergalactic space with a scale of -- 100 Mpc, for z - 0.1 and Eγ -1 TeV. These cascades proceed through electron-positron pair production and inverse Compton （IC） scattering in the cosmic background radiation fields, mainly cosmic microwave background （CMB） radiation and extragalactic background light in the voids of the universe. The existence of an intergalactic magnetic field （IGMF） would deflect paths of electron-positron pairs that scatter CMB photons, causing some observable effects, such as time delay, an ex- tended halo, and a spectral change. Here we reanalyze the diffusion of an electron jet deflected by IGMF and propose a unified semi-analytical model. By using publicly available data from the Fermi/LAT detector and contemporaneous TeV observations, we find that the cascade photon flux is not significantly affected by the IGMF strength for non-variable blazars when the IGMF is weaker than ,-~ 10-16 G. This result is clearly different from previous works that analyzed the extended halo and time de- lay separately for non-variable blazars and flaring blazars. By applying our model to two extreme blazars （1ES 0229＋200 and 1ES 1218＋304）, we obtain the IGMF lower limit of order ≥10-13 --10-14 G in the non-variable case, which is a stronger constraint on the IGMF strength than previous works （≥10-16 ,-- 10-18 G）, and ≥10-18 -- 10-19 G in the case of flaring blazars. Furthermore, we study the light curves and extended halo of the cascade photons by considering the effects of the IGME

关键词： gamma rays: general -- galaxies: magnetic field -- galaxies: individual(1ES 0229+200 1ES 1218+304)

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Natural Variation of Pto and Fen Genes and Marker-Assisted Selection for Resistance to Bacterial Speck in Tomato

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Agricultural Sciences in China 2011年第6期10卷 827-837页

作者： SUN Wan-yu ZHAO Wan-ying WANG yuan-yuan pei Cheng-cheng yang Wen-cai Department of Vegetable Science College of Agronomy and Biotechnology China Agricultural University Beijing 100193 P.R.China

The resistance in tomato plants to bacterial speck caused by Pseudomonas syringae pv. tomato is triggered by the interactions between the plant resistance protein Pto and the pathogen avirulence proteins AvrPto or AvrPtoB. Fen is a gene encoding closely related functional protein kinases as the Pto gene. To investigate the status of resistance to the pathogen and natural variation of Pto and Fen genes in tomato, 67 lines including 29 growing in China were subject to disease resistance evaluation and fenthion-sensitivity test. Alleles of Pto and Fen were amplified from genomic DNA of 25 tomato lines using polymerase chain reaction （PCR） and sequences were determined by sequencing the PCR products. The results indicated that none of the 29 cultivars/hybrids growing in China were resistant to bacterial speck race 0 strain DC3000. Seven of eight tomato lines resistant to DC3000 were also fenthion-sensitive. Analysis of deduced amino acid sequences identified three novel residue substitutions between Pto and pto, and one new substitution identified between Fen and fen. A PCR-based marker was developed and successfully used to select plants with resistance to DC3000.

关键词： tomato bacterial speck Pto Fen natural variation marker-assisted selection

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Spin Evolution of the Magnetar SGR J1935+2154

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Research in Astronomy and Astrophysics 2024年第1期24卷 201-211页

作者： Ming-Yu Ge yuan-pei yang Fang-Jun Lu Shi-Qi Zhou Long Ji Shuang-Nan Zhang Bing Zhang Liang Zhang pei Wang Kejia Lee Weiwei Zhu Jian Li Xian Hou Qiao-Chu Li Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China South-Western Institute For Astronomy Research Yunnan UniversityKunming 650504China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China Key Laboratory of Stellar and Interstellar Physics and School of Physics and Optoelectronics Xiangtan UniversityXiangtan 411105China School of Physics and Astronomy Sun Yat-Sen UniversityZhuhai 519082China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Nevada Center for Astrophysics University of NevadaLas VegasNV 89154USA Department of Physics and Astronomy University of NevadaLas VegasNV 89154USA National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Department of Astronomy Peking UniversityBeijing 100871China CAS Key Laboratory for Research in Galaxies and Cosmology Department of AstronomyUniversity of Science and Technology of ChinaHefei 230026China School of Astronomy and Space Science University of Science and Technology of ChinaHefei 230026China Yunnan Observatories Chinese Academy of SciencesKunming 650216China School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key laboratory of Modern Astronomy and Astrophysics Nanjing UniversityNanjing 210023China

Fast radio bursts(FRBs)are short pulses observed in radio frequencies usually originating from cosmological *** discovery of FRB 200428 and its X-ray counterpart from the Galactic magnetar SGR J1935+2154suggests that at least some FRBs can be generated by ***,the majority of X-ray bursts from magnetars are not associated with radio *** fact that only in rare cases can an FRB be generated raises the question regarding the special triggering mechanism of *** we report long time spin evolution of SGR J1935+2154 until the end of *** to v and v,the spin evolution of SGR J1935+2154 could be divided into two *** first stage evolves relatively steady evolution until 2020 April *** the burst activity in2020,the spin of SGR J1935+2154 shows strong variations,especially for *** the burst activity in 2022October,a new spin-down glitch with△v/v=(-7.2±0.6)×10^(-6)is detected around MJD 59876,which is the second event in SGR J1935+*** the end,spin frequency and pulse profile do not show variations around the time of FRB 200428 and radio bursts 221014 and 221021,which supply strong clues to constrain the trigger mechanism of FRBs or radio bursts.

关键词： (stars:)pulsars:general (stars:)pulsars:individual(SGR J1935+2154) X-rays:bursts

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An X-Ray Burst Associated with FRB 200428 from a Magnetar-asteroid Impact

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Research in Astronomy and Astrophysics 2023年第8期23卷 238-246页

作者： Ze-Nan Liu yuan-pei yang Wei-yang Wang Zhao Joseph Zhang Qiao-Chu Li Ken Chen Jia Ren Bin-Bin Zhang Cheng-Kui Li Shuang-Nan Zhang Zi-Gao Dai School of Astronomy and Space Science Nanjing UniversityNanjing 210023China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210023China South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Chinese Academy of SciencesBeijing 100049China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Astronomy School of Physical SciencesUniversity of Science and Technology of ChinaHefei 230026China

Fast radio bursts(FRBs)are extragalactic radio transients with millisecond duration and brightness *** FRB-associated X-ray burst(XRB)was recently found to arise from the Galactic magnetar SGR J1935+*** the model of Dai,in which an FRB may originate from a magnetar encountering an asteroid,we focus on explaining the spectrum of the XRB associated with FRB 200428 from SGR J1935+*** between asteroidal fragments and the magnetar surface produce a fireball,which further expands *** to the velocity difference among some shells in the fireball,internal shocks would form far away from the magnetar,and further emit X-ray *** propose that the FRB-associated XRB can be produced by synchrotron emission from the internal shocks,and then constrain the physical parameters by the observed XRB spectrum.

关键词： stars magnetars-minor planets-asteroids general-radiation mechanisms general

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FAST Observations of an Extremely Active Episode of FRB 20201124A.Ⅲ.Polarimetry

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Research in Astronomy and Astrophysics 2022年第12期22卷 81-98页

作者： Jin-Chen Jiang Wei-yang Wang Heng Xu Jiang-Wei Xu Chun-Feng Zhang Bo-Jun Wang De-Jiang Zhou Yong-Kun Zhang Jia-Rui Niu Ke-Jia Lee Bing Zhang Jin-Lin Han Di Li Wei-Wei Zhu Zi-Gao Dai Yi Feng Wei-Cong Jing Dong-Zi Li Rui Luo Chen-Chen Miao Chen-Hui Niu Chao-Wei Tsai Fa-Yin Wang pei Wang Ren-Xin Xu yuan-pei yang Zong-Lin yang Ju-Mei Yao Mao yuan Department of Astronomy Peking UniversityBeijing 100871China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China Department of Physics and Astronomy University of NevadaLas VegasNV 89154USA CAS Key Laboratory of FAST NAOCChinese Academy of SciencesBeijing 100101China Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311100China NAOC-UKZN Computational Astrophysics Centre University of KwaZulu-NatalDurban 4000South Africa Department of Astronomy University of Science and Technology of ChinaHefei 230026China Cahill Center for Astronomy and Astrophysics MC 249-17California Institute of TechnologyPasadenaCA 91125USA CSIRO Space and Astronomy P.O.Box 76EppingNSW 1710Australia School of Astronomy and Space Science Nanjing UniversityNanjing 210093China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationChina South-Western Institute For Astronomy Research Yunnan UniversityYunnan 650504China Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

As the third paper in the multiple-part series,we report the statistical properties of radio bursts detected from the repeating fast radio burst(FRB)source FRB 20201124A with the Five-hundred-meter Aperture Spherical radio Telescope during an extremely active episode between the 25th and 28th of September 2021(UT).We focus on the polarization properties of536 bright bursts with S/N>*** found that the Faraday rotation measures(RMs)monotonically dropped from-579to-605 rad m^(-2)in the 4 day *** RM values were compatible with the values(-300 to-900 rad m^(-2))reported 4 months ***,the RM evolution rate in the current observation window was at least an order of magnitude smaller than the one(~500 rad m^(-2)day^(-1))previously reported during the rapid RM-variation phase,but is still higher than the one(≤1 rad m^(-2)day^(-1))during the later RM no-evolution *** bursts of FRB 20201124A were highly polarized with the total degree of polarization(circular plus linear)greater than 90%for more than 90%of all *** distribution of linear polarization position angles(PAs),degree of linear polarization(L/I)and degree of circular polarization(V/I)can be characterized with unimodal distribution *** the observation window,the distributions became wider with time,i.e.,with larger scatter,but the centroids of the distribution functions remained nearly *** individual bursts,significant PA variations(confidence level 5σ)were observed in 33%of all *** polarization of single pulses seems to follow certain complex trajectories on the Poincarésphere,which may shed light on the radiation mechanism at the source or the plasma properties along the path of FRB propagation.

关键词： (stars:)pulsars:general stars:magnetars radio continuum:general polarization

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Scintillation Arc from FRB 20220912A

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Science China(Physics,Mechanics & Astronomy) 2024年第1期67卷 134-142页

作者： Zi-Wei Wu Robert AMain Wei-Wei Zhu Bing Zhang Peng Jiang Jia-Rui Niu Jin-Lin Han Di Li Ke-Jia Lee Dong-Zi Li yuan-pei yang Fa-Yin Wang Rui Luo pei Wang Chen-Hui Niu Heng Xu Bo-Jun Wang Wei-yang Wang Yong-Kun Zhang Yi Feng De-Jiang Zhou Yong-Hua Xu Can-Min Deng Yu-Hao Zhu National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China Max-Planck-Institut für Radioastronomie Bonn 53121Germany Institute for Frontier in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Nevada Center for Astrophysics and Department of Physics and Astronomy University of NevadaLas VegasNV 89154USA CAS Key Laboratory of FAST National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy University of Chinese Academy of SciencesBeijing 100049China NAOC-UKZN Computational Astrophysics Centre University of KwaZulu-NatalDurban 4000South Africa Department of Astronomy Peking UniversityBeijing 100871China Kavli Institute for Astronomy and Astrophysics Peking UniversityBeijing 100871China Cahill Center for Astronomy and Astrophysics California Institute of TechnologyPasadena 91125USA South-Western Institute For Astronomy Research Yunnan UniversityKunming 650504China School of Astronomy and Space Science Nanjing UniversityNanjing 210093China Key Laboratory of Modern Astronomy and Astrophysics(Nanjing University) Ministry of EducationNanjing 210023China CSIRO Space and Astronomy Epping 1710Australia Department of Astronomy School of Physics and Materials ScienceGuangzhou UniversityGuangzhou 510006China Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311100China Yunnan Observatories Chinese Academy of SciencesKunming 650011China Guangxi Key Laboratory for Relativistic Astrophysics Department of PhysicsGuangxi UniversityNanning 530004China

We present the interstellar scintillation analysis of fast radio burst(FRB)20220912A during its extremely active episode in 2022using data from the Five-hundred-meter Aperture Spherical Radio Telescope(FAST).We detect a scintillation arc in the FRB’s secondary spectrum,which describes the power in terms of the scattered FRB signals’time delay and Doppler *** arc indicates that the scintillation is caused by a highly localized *** analysis favors a Milky Way origin of the ionized interstellar medium(IISM)for the localized scattering medium but cannot rule out a host galaxy *** present our method for detecting the scintillation arc,which can be applied generally to sources with irregularly spaced bursts or *** methods could help shed light on the complex interstellar environment surrounding the FRBs and in our Galaxy.

关键词： fast radio burst scintillation FRB 20220912A

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Circular polarization in two active repeating fast radio bursts

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Science Bulletin 2022年第23期67卷 2398-2401,M0003页

作者： Yi Feng Yong-Kun Zhang Di Li yuan-pei yang pei Wang Chen-Hui Niu Shi Dai Ju-Mei Yao Research Center for Intelligent Computing Platforms Zhejiang LaboratoryHangzhou 311100China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China University of Chinese Academy of Sciences Beijing 100049China NAOC-UKZN Computational Astrophysics Centre University of KwaZulu-NatalDurban 4000South Africa South-Western Institute for Astronomy Research Yunnan UniversityKunming 650500China Purple Mountain Observatory Chinese Academy of SciencesNanjing 210023China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China Institute of Astrophysics Central China Normal UniversityWuhan 430079China School of Science Western Sydney UniversityLocked Bag 1797Penrith NSW 2751Australia Xinjiang Astronomical Observatory Chinese Academy of SciencesUrumqi 830011China

Fast radio bursts(FRBs)are bright millisecond-duration radio transients first discovered by Lorimer et al.[1].While their cosmological origin and energetic naturemake them ideal tools for probing a range of astrophysics[2],their progenitors and radiation mechanisms are still *** subset of FRBs is the so-called repeating FRBs,which recurrently emit millisecond-duration radio bursts.

关键词：圆偏振法拉第球面射电望远镜本征特性偏振探测辐射机制无线电波偏振性质

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Low‑Temperature Fabrication of Stable Black‑Phase CsPbI_(3)Perovskite Flexible Photodetectors Toward Wearable Health Monitoring

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Nano-Micro Letters 2025年第3期17卷 232-245页

作者： Yingjie Zhao Yicheng Sun Chaoxin pei Xing Yin Xinyi Li Yi Hao Mengru Zhang Meng yuan Jinglin Zhou Yu Chen Yanlin Song College of Chemistry and Pingyuan Laboratory Zhengzhou UniversityZhengzhou 450001People’s Republic of China Key Laboratory of Green Printing Institute of ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China Key Laboratory of Bio‑Inspired Materials and Interfacial Science Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190People’s Republic of China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049People’s Republic of China

Flexible wearable optoelectronic devices fabricated fromorganic–inorganic hybrid perovskites significantly accelerate the developmentof portable energy,biomedicine,and sensing fields,but their poor thermal stabilityhinders further ***,all-inorganic perovskites possessexcellent thermal stability,but black-phase all-inorganic perovskite filmusually requires high-temperature annealing steps,which increases energy consumptionand is not conducive to the fabrication of flexible wearable *** this work,an unprecedented low-temperature fabrication of stable blackphaseCsPbI3perovskite films is demonstrated by the in situ hydrolysis reactionof diphenylphosphinic chloride *** released diphenyl phosphateand chloride ions during the hydrolysis reaction significantly lower the phasetransition temperature and effectively passivate the defects in the perovskitefilms,yielding high-performance photodetectors with a responsivity of 42.1 AW−1 and a detectivity of 1.3×10^(14)***,high-fidelity imageand photoplethysmography sensors are demonstrated based on the fabricated flexible wearable *** work provides a newperspective for the low-temperature fabrication of large-area all-inorganic perovskite flexible optoelectronic devices.

关键词： In situ hydrolyzation Low-temperature processing All-inorganic perovskite Flexible photodetectors Health monitoring

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清蛋白与前清蛋白和C-反应蛋白检测对普外科患者术后感染的诊断研究

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中华医院感染学杂志 2017年第20期27卷 4716-4719页

作者：张会英袁培江源洋贾俊李中正河南省南阳市中医院外一科河南南阳473000

目的探讨清蛋白、前清蛋白和C-反应蛋白检测在普外科患者术后手术部位感染的诊断价值。方法选择医院2014年2月-2016年2月普外科手术患者320例,所有患者术前均确诊无感染,分别于术后12、24h、3d和7d取血标本检测清蛋白、前清蛋白和C-反... 详细信息

目的探讨清蛋白、前清蛋白和C-反应蛋白检测在普外科患者术后手术部位感染的诊断价值。方法选择医院2014年2月-2016年2月普外科手术患者320例,所有患者术前均确诊无感染,分别于术后12、24h、3d和7d取血标本检测清蛋白、前清蛋白和C-反应蛋白(CRP),监测所有患者于术后7d内是否发生感染;根据诊断结果将患者分为感染组27例和未感染组293例,比较两组术前、术后不同时间点的清蛋白、前清蛋白和CRP水平。结果术后发生感染患者27例,感染率8.44%,共检出病原菌36株,其中革兰阴性菌10株占27.78%,革兰阳性菌16株占44.44%,真菌10株占27.78%;两组患者清蛋白、前清蛋白、CRP在术前2h比较差异均无统计学意义,两组术后12、24h、3d、7d感染组患者清蛋白、前清蛋白、CRP明显低于术前,且感染组患者明显低于未感染组(P<0.05),两组患者术后12、24h、3d、7dCRP均明显高于术前2h,且感染组明显高于对照组(P<0.05);清蛋白、前清蛋白、CRP、清蛋白+前清蛋白、清蛋白+CRP、前清蛋白+CRP、清蛋白+前清蛋白+CRP 7种诊断方案对患者术后感染的诊断敏感度、特异度比较,以清蛋白+前清蛋白+CRP方案的诊断敏感度、特异度最佳。结论采用清蛋白+前清蛋白+CRP实验数据诊断普外科患者术后手术部位感染,时效性和客观性均较好,具有一定的临床价值。

关键词：普外科手术部位感染清蛋白前清蛋白 CRP 诊断价值

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十全育真汤对H_(22)荷瘤小鼠免疫功能的影响

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中国应用生理学杂志 2017年第1期33卷 51-55页

作者：朱云超詹光杰袁德培杨付明黄琼湖北民族学院医学院恩施445000

目的:研究十全育真汤对荷瘤小鼠免疫功能的影响,探讨十全育真汤抗肿瘤的作用机制。方法:SPF级雄性昆明种小鼠30只,制成荷H_(22)小鼠肝癌细胞移植瘤模型,随机分为模型组、阳性对照组及十全育真汤组(n=10);另选择未接种小鼠10只为正常对... 详细信息

目的:研究十全育真汤对荷瘤小鼠免疫功能的影响,探讨十全育真汤抗肿瘤的作用机制。方法:SPF级雄性昆明种小鼠30只,制成荷H_(22)小鼠肝癌细胞移植瘤模型,随机分为模型组、阳性对照组及十全育真汤组(n=10);另选择未接种小鼠10只为正常对照组。正常对照组、模型组每天按10 ml/kg灌胃生理盐水及蒸馏水,阳性对照组、十全育真汤组每天按8 g/kg、18 g/kg灌胃参一药液(80 mg/ml)与十全育真汤剂。连续给药14 d后处死小鼠,测量胸腺、脾脏指数及抑瘤率,检测外周血中白细胞、淋巴细胞含量及T细胞亚群CD3、CD4、CD8细胞百分比,血清中白细胞介素2(IL-2)、肿瘤坏死因子α(TNF-α)及干扰素-β(IFN-β)的含量,淋巴细胞增殖能力及NK细胞杀伤功能。结果:较正常对照组,十全育真汤组小鼠体重明显增加,脾脏指数显著增大(P<0.05);白细胞、淋巴细胞CD4、CD8、CD3及TNF-α含量明显升高(P<0.05);IL-2、IFN-β含量显著下降(P<0.05);淋巴细胞增殖能力、NK细胞杀伤功能明显升高(P<0.05)。与模型组相比,十全育真汤组小鼠胸腺、脾脏指数显著增大(P<0.05);白细胞、淋巴细胞CD3、CD4、IL-2、IFN-β及TNF-α含量明显升高(P<0.05),CD8含量则显著降低(P<0.05);NK细胞杀伤功能及淋巴细胞增殖能力显著增加(P<0.05)。结论:十全育真汤可促进H_(22)荷瘤小鼠免疫器官的生长,增强机体免疫功能,有利于肿瘤机体的恢复。

关键词：十全育真汤 H22荷瘤小鼠免疫

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