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Einstein Probe discovery of EP240408a: A peculiar X-ray transient with an intermediate timescale

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Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 222-240页

作者： Wenda zhang weimin Yuan Zhixing Ling Yong chen Nanda Rea Arne Rau Zhiming Cai Huaqing cheng Francesco Coti Zelati Lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li Paul O’Brien Rongfeng Shen Xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang Lei yang Bing zhang chen zhang Shuang-Nan zhang Yonghe zhang Jie An David Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P.U.Fynbo Lluis Galbany Saurabh W.Jha Shuaiqing Jiang Albert Kong Erik Kuulkers weihua Lei Wenxiong Li Bifang Liu Mingjun Liu Xing Liu Yuan Liu Zhu Liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu yanjun Xu Suijian Xue Yongquan Xue Zijian zhang Zipei Zhu Hu Zou Congying Bao Fansheng chen Houlei chen Tianxiang chen wei chen Yehai chen Yifan chen chenzhou Cui weiwei Cui yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin chengkui Li Junfei Li Longhui Li Maoshun Li wei Li Zhengda Li Tianying Lian Congzhan Liu Heyang Liu Huaqiu Liu Fangjun Lu Laidan Luo Jia Ma Xuan Mao Haiwu pan Xin pan Liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang Juan Wang Lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang yan Haonan yang Xiongtao yang yanji yang Juan zhang Mo zhang Wenjie zhang Zhen zhang Zhen zhang Ziliang zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu National Astronomical Observatories Chinese Academy of Sciences School of Astronomy and Space Sciences University of Chinese Academy of Sciences Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Institute of Space Sciences (ICE) CSIC Institut d’Estudis Espacials de Catalunya (IEEC) Max Planck Institute for Extraterrestrial Physics Innovation Academy for Microsatellites Chinese Academy of Sciences Department of Physics University of Hong Kong School of Physics and Astronomy University of Leicester School of Physics and Astronomy Sun Yat-sen University Department of Physics Anhui Normal University Shanghai Institute of Technical Physics Chinese Academy of Sciences Physics Department Tsinghua University Nevada Center for Astrophysics University of Nevada Las Vegas Department of Physics and Astronomy University of Nevada Las Vegas South African Astronomical Observatory Department of Astronomy University of Cape Town Department of Physics University of the Free State Université Paris Cité CNRS Astroparticule et Cosmologie Université Paris Cité CEA Paris-Saclay IRFU/DAp-AIM Department of Astronomy Guangzhou University Cosmic Dawn Center (DAWN) Niels Bohr Institute University of Copenhagen Department of Physics and Astronomy Rutgers the State University of New Jersey Institute for Cosmic Ray Research The University of Tokyo ESA/ESTEC Department of Astronomy School of Physics Huazhong University of Science and Technology INAF-Osservatorio Astrofisico di Torino Sydney Institute for Astronomy School of Physics The University of Sydney Department of Astronomy Xiamen University Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Department of Astronomy University of Science and Technology School of Astronomy and Space Sciences University of Science and Technology of China Institute of Deep Space Sciences Deep Space Exploration Laboratory Department of Astronomy School of Physics and Astronomy Yunnan University Shanghai Astronomical Observatory Chi

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe （EP） and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope （WXT） on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in 0.5-4 ke V,～300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 ke V,with a power-law photon index varying *** X-ray light curve shows a plateau lasting for ～4 d,followed by a steep decay till becoming undetectable ～10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of～10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

关键词： X-ray transients ${\bm~{Einstein~~Probe}}$

Hydrophobic,Hemostatic and Durable Nanofiber Composites with a Screw‑Like Surface Architecture for Multifunctional Sensing Electronics

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Advanced Fiber Materials 2023年第6期5卷 2040-2054页

作者： wei Xiao Yutong chen Gaoxing pan Jun yan Jin zhang Jiefeng Gao School of Chemistry and Chemical Engineering Yangzhou UniversityYangzhou 225002JiangsuPeople’s Republic of China MOE Key Laboratory for Analytical Science of Food Safety and Biology College of ChemistryFuzhou UniversityFuzhou 350108FujianPeople’s Republic of China Qingyuan Innovation Laboratory College of Chemical EngineeringFuzhou University2 Xueyuan RoadFuzhou 350108FujianPeople’s Republic of China

MXene-decorated textile composites have attracted tremendous attention,due to their possible applications in wearable sensing ***,the easy oxidation,low strain sensitivity and poor water-proof performance restrict the applications of MXene-based smart ***,we developed a flexible and hydrophobic polymer nanofibrous composite with a screw-like structure by assembling MXene nanosheets onto a prestretched polyurethane(PU)nanofiber surface and subsequent fluorination *** thin hydrophobic fluorosilane layer can greatly prevent the MXene shell from being oxidized and simultaneously endow the nanofiber composite with good hemostatic *** wrinkled MXene shell with the screw-like structure enhances the sensitivity of MXene@PU nanofiber composite(HMPU)toward strain,and the hydrophobic strain sensor exhibits a high gauge factor(324.4 in the strain range of 85–100%),and can detect different human *** virtue of its excellent water-proof performance,HMPU can function normally in corrosive and underwater *** addition,the resistance of HMPU exhibits a negative temperature coefficient;thus,HMPU shows potential for monitoring temperature and providing a temperature *** multifunctional HMPU shows broad application prospects in smart wearable electronics.

关键词： Nanofibrous composite MXene nanosheets Strain sensor Temperature alarm

Establishing and Validating Refractive Error Reference Values for Myopia Prediction Among Children Aged 6–12 Years-Jiangsu Province,China,2018-2023

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China CDC weekly 2024年第32期6卷 804-810页

作者： Xiyan zhang chen-wei pan wei Du Yonglin Zhou Jie yang yan Wang Yiliang Xin wei Lu Hongxia Ma School of Public Health Nanjing Medical UniversityNanjing CityJiangsu ProvinceChina Jiangsu Provincial Center for Disease Control and Prevention Nanjing CityJiangsu ProvinceChina School of Public Health Suzhou Medical College of Soochow UniversitySuzhou CityJiangsu ProvinceChina School of Public Health Southeast UniversityNanjing CityJiangsu ProvinceChina

Summary What is already known about this topic?Previously,it has been proved that a simplified model that uses refraction error value provides a robust and efficient means of predicting myopia for non-myopic *** targeting non-myopic children with alert refraction errors(or insufficient hyperopia reserve)holds significant importance in reducing the incidence rate of *** is added by this report?This study,comprising two phases(surveillance and cohort studies),was aiming to pinpoint the precise refractive error value for the onset of myopia prediction among non-myopic children in Jiangsu *** are the implications for public health practice?First,when conducting myopia screenings using pupil dilation for non-myopic populations:the cycloplegic 50th percentile refractive error emerges as a more precise predictive ***,when conducting myopia screenings without pupil dilation:this study advocates for the incorporation of axial length(AL)and corneal curvature(CC)values as supplementary indicators in screenings.

关键词： precise dating holds

Lesion discrimination with breath-hold hepatic diffusionweighted imaging:A meta-analysis

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World Journal of Gastroenterology 2015年第5期21卷 1621-1627页

作者： Zhi-Guang chen Li Xu Si-wei zhang yan Huang Rui-Huan pan Department of Radiology Guangdong Provincial Traditional Chinese Medicine Hospital Department of Neurology Guangdong Provincial Traditional Chinese Medicine Hospital

AIM:To investigate the diagnostic capability of breathhold diffusion-weighted imaging(DWI) for differentiation between malignant and benign hepatic ***:A total of 614 malignant liver lesions(132 hepatocellular carcinomas,468 metastases and 14 intrahepatic cholangiocarcinomas) and 291 benign liver lesions(102 hemangiomas,158 cysts,24 focal nodular hyperplasia,1 angiomyolipoma and 6 hepatic adenomas) were included from seven studies(eight sets of data).RESULTS:The pooled sensitivity and specificity of breath-hold DWI were 0.93 [95% confidence interval(CI):0.91-0.95] and 0.87(95%CI:0.83-0.91),*** positive likelihood ratio and negative likelihood ratio were 7.28(95%CI:4.51-11.76) and 0.09(95%CI:0.05-0.17),*** P value for χ2 heterogeneity for all pooled estimates was 0.05).CONCLUSION:Breath-hold DWI is useful for differentiating between malignant and benign hepatic *** diffusion characteristics of benign lesions that mimic malignant ones have rarely been investigated.

关键词： Breath-hold imaging Diffusion-weighted imaging Hep

Retinal neovascularization induced by mutant Vldlr gene inhibited in an inherited retinitis pigmentosa mouse model:an in-vivo study

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International Journal of Ophthalmology(English edition) 2021年第7期14卷 990-997页

作者： wei-Ming yan pan Long Mei-Zhu chen Dong-Yu wei Jian-Cong Wang Zuo-Ming zhang Lei zhang Tao chen Department of Ophthalmology the 900^(th)Hospital of Joint Logistic Support Forceo of PLA(Clinical Medical College of Fujian Medical UniversityDongfang Hopsital Affiliated to Xiamen University)Fuzhou 350025Fujian ProvinceChina Center of Clinical Aerospace Medicine Air Force Medical UniversityXi’an 710032Shaanxi ProvinceChina Department of Ophthalmology the West General Hospital of Chinese PLAChengdu 610083Sichuan ProvinceChina BeiJing HealthOLight Technology Co. Ltd.Beijing 10010China Shaanxi Eye Hospital Xi’an People’s Hospital(Xi’an Fourth Hospital)Affiliated Guangren HospitalSchool of MedicineXi’an Jiaotong UniversityXi’an 710004Shaanxi ProvinceChina

AIM:To explore whether the retinal neovascularization(NV)in a genetic mutant mice model could be ameliorated in an inherited retinitis pigmentosa(RP)mouse,which would help to elucidate the possible mechanism and prevention of retinal NV diseases in ***:The Vldlr^(-/-)mice,the genetic mutant mouse model of retinal NV caused by the homozygous mutation of Vldlr gene,with the rd1 mice,the inherited RP mouse caused by homozygous mutation of Pde6b gene were *** of the above two mice led to the birth of the F1 hybrids,further inbreeding of which gave birth to the F2 *** ocular genotypes and phenotypes of the mice from all generations were examined,with the F2 offspring grouped according to the ***:The rd1 mice exhibited the RP phenotype of outer retinal degeneration and loss of retinal *** Vldlr^(-/-)mice exhibited the phenotype of retinal NV obviously shown by the fundus fluorescein *** F1 hydrides,with the heterozygote genotype,exhibited no phenotypes of RP or retinal *** F2 offspring with homozygous genotypes were grouped into four *** were the F2-Ⅰmice with the wild-type Pde6b and Vldlr genes(Pde6b~(+/+)-Vldlr~(+/+)),which had normal ocular phenotypes;the F2-Ⅱmice with homozygous mutant Vldlr gene(Pde6b~(+/+)-Vldlr^(-/-)),which exhibited the retinal NV phenotype;the F2-Ⅲmice with homozygous mutant Pde6b gene(Pde6b^(-/-)-Vldlr~(+/+)),which exhibited the RP ***,the F2-Ⅳmice with homozygous mutant Vldlr and Pde6b gene(Pde6b^(-/-)-Vldlr^(-/-))showed only the RP phenotype,without the signs of retinal ***:The retinal NV can be inhibited by the RP phenotype,which implies the role of a hyperoxic state in treating retinal NV diseases.

关键词： retinitis pigmentosa retinal neovascularization Pde6b gene Vldlr gene photoreceptor

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纳米ATO/PP复合材料的结构与导电性能

稀有金属材料与工程 2007年第A02期36卷 163-166页

作者：潘玮张慧勤陈燕中原工学院材料与化工学院河南郑州450007

分别采用超声波辅助溶液共混和熔融共混的方式制备了ATO/PP复合材料,采用扫描电镜对比分析了复合材料的微观相态结构及导电性能,采用广角X衍射及偏光显微镜研究了纳米ATO的加入对PP结晶性能的影响。结果表明:采用溶液混合并用超声辅助... 详细信息

分别采用超声波辅助溶液共混和熔融共混的方式制备了ATO/PP复合材料,采用扫描电镜对比分析了复合材料的微观相态结构及导电性能,采用广角X衍射及偏光显微镜研究了纳米ATO的加入对PP结晶性能的影响。结果表明:采用溶液混合并用超声辅助分散的方法使纳米ATO在PP基体中分散良好,在纳米ATO含量较低的情况下就可以获导电性能良好的复合材料;纳米ATO的加入起到了异相成核作用,使PP晶粒细化,但ATO的加入没有改变PP的结晶形态,ATO/PP纳米复合材料的结晶形态仍属于a晶型。

关键词：纳米ATO 聚丙烯导电性能结晶性能

Gastroduodenal artery disconnection during liver transplantation decreases non-anastomotic stricture incidence

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Hepatobiliary & pancreatic Diseases International 2023年第1期22卷 28-33页

作者： Bi pan wei Liu yan-Jiao Ou yan-Qi zhang Di Jiang Yuan-cheng Li Zhi-Yu chen Lei-Da zhang cheng-cheng zhang Department of Hepatobiliary Surgery Southwest HospitalThird Military Medical University(Army Medical University)Chongqing 400038China Department of Health Statistics College of Military Preventive MedicineThird Military Medical University(Army Medical University)Chongqing 400038China

Background:The hepatic artery is the only blood source nourishing the biliary duct and associated with biliary complication after liver transplantation(LT).Gastroduodenal artery(GDA)disconnection increased proper hepatic artery *** this procedure attenuates biliary non-anastomotic stricture(NAS)is not ***:A total of 241 patients with LT were retrospectively *** patients were divided into the GDA disconnection(GDA-)and GDA preservation(GDA+)*** score matching(PSM)was administrated to reduce *** regression was conducted to analyze risk factors for biliary NAS before and after *** complications were ***-Meier survival analysis and log-rank tests were performed to compare overall ***:In all,99 patients(41.1%)underwent GDA disconnection,and 49(20.3%)developed *** logistic regression revealed that GDA preservation(OR=2.24,95%CI:1.11-4.53;P=0.025)and model for end-stage liver disease(MELD)score>15(OR=2.14,95%CI:1.12-4.11;P=0.022)were risk factors for biliary *** provided 66 pairs using 1:2 matching method,including 66 GDA disconnection and 99 GDA preservation *** logistic regression after PSM also showed that GDA preservation(OR=3.15,95%CI:1.26-7.89;P=0.014)and MELD score>15(OR=2.41,95%CI:1.08-5.36;P=0.031)were risk factors for *** comparing complications between the two groups,GDA preservation was associated with a higher incidence of biliary NAS before and after PSM(P=0.031 and 0.017,respectively).In contrast,other complications including early allograft dysfunction(P=0.620),small-for-size graft syndrome(P=0.441),abdominal hemorrhage(P=1.000),major complications(Clavien-Dindo grade≥3,P=0.318),and overall survival(P=0.088)were not significantly different between the two ***:GDA disconnection during LT ameliorates biliary NAS incidence and may be recommended for application in clinical practice.

关键词： Liver transplantation Biliary complication Gastroduodenal artery disconnection Hepatic artery hyperperfusion

Evaporated potassium chloride for double-sided interfacial passivation in inverted planar perovskite solar cells

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Journal of Energy Chemistry 2021年第3期30卷 493-500页

作者： Shasha zhang Xiaobo yan Zonghao Liu Hongmei Zhu Zhichun yang Yuqian Huang Sanwan Liu Di Wu Ming pan wei chen Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074HubeiChina China-EU Institute for Clean and Renewable Energy Huazhong University of Science and TechnologyWuhan 430074HubeiChina Shenzhen Key Laboratory of Nanobiomechanics Shenzhen Institutes of Advanced TechnologyChinese Academy of SciencesShenzhen 518055GuangdongChina Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001HenanChina

Defect-induced charge carrier recombination at the interfaces between perovskite and adjacent charge transport layers restricts further improvements in the device performance of perovskite solar cells(PSCs).Defect passivation at these interfaces can reduce trap states and inhibit the induced nonradiative ***,we report a double-sided interfacial passivation via simply evaporating potassium chloride(DIP-KCl)at both the hole transport layer(HTL)/perovskite and perovskite/electron transport layer(ETL)interfaces in inverted planar *** demonstrate that the bottom KCl layer at the HTL/perovskite interface not only reduces the interfacial defects and improves the interfacial contact,but also leads to increased perovskite crystallinity,while the top KCl layer at the perovskite/ETL interface efficiently passivates the perovskite top surface defects and facilitates electron extraction at this ***,suppressed nonradiative recombination and faster charge extraction at both interfaces close to the perovskite layer can be achieved by using our DIP-KCl *** a result,inverted PSCs based on DIP-KCl present an increased efficiency from 17.1% to 19.2% and enhanced stability,retaining over 90% of their initial efficiency after aging at maximum power point tracking for 1000 *** work provides a simple and efficient way for defect passivation to further increase the efficiency and stability of PSCs.

关键词： Double-sided interfacial passivation KCl Defect passivation Nonradiative recombination Perovskite solar cells

Fusobacterium Nucleatum Is a Risk Factor for Metastatic Colorectal Cancer

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Current Medical Science 2022年第3期42卷 538-547页

作者： Wen-dan chen Xin zhang Ya-ping zhang Cong-bo YUE yan-lei WANG Hong-wei pan yan-li zhang Hui LIU Yi zhang Department of Clinical Laboratory Qilu Hospital of Shandong UniversityJinan 250012China Department of General Surgery Qilu Hospital of Shandong UniversityJinan 250012China Department of Clinical Laboratory Shandong Provincial Third HospitalJinan 250031China

Objective Increasing evidence has indicated that there is a correlation between Fusobacterium nucleatum(***)abundance and poor prognosis of colorectal cancer(CRC).Furthermore,tumor metastasis plays a decisive role in the prognosis of CRC ***,it was hypothesized that the abundance of *** in CRC tissues affects the tumor *** In the present study,*** DNA obtained from 141 resected CRC samples was quantified by qPCR to determine whether there were differences in *** abundance between groups with and without CRC *** The results revealed that *** was more abundant in CRC patients with metastasis,and CRC tissues enriched with *** had a higher risk of lymph node metastasis and distant *** receiver operating characteristic curve indicated that *** in CRC tissues could be used as an indicator for CRC metastasis,to some ***,the in vitro experiments(electron microscopy,and migration and invasion trials)revealed that *** was a highly invasive bacterial strain,and could significantly enhance the invasion and migration capacity of SW480 and SW620 *** addition,a meta-analysis comprehensively indicated a slight correlation between *** abundance and advanced CRC stage(RR=1.17,95%CI:1.00–1.37,P=0.04,random effect).Conclusion There is a correlation between *** abundance and CRC metastasis,and *** may serve as a metastasis biomarker for CRC patients.

关键词： Fusobacterium nucleatum colorectal cancer metastasis