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Experimental Podophyllotoxin (Bajiaolian) Poisoning:——Ⅰ. Effects on the Nervous System 被引量:7
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作者 LOUIS W.cHANG c.M.yang +1 位作者 c.F.cHEN J.F.DENG 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 1992年第4期283-292,共10页
Bajiaolian, one of the species in the Mayapple family ( Podophyllum pelatum ), has been widely used as a traditional Chinese herbal medicine for the remedies of snake bites, general weakness, poisons, condyloma accumi... Bajiaolian, one of the species in the Mayapple family ( Podophyllum pelatum ), has been widely used as a traditional Chinese herbal medicine for the remedies of snake bites, general weakness, poisons, condyloma accuminata, lymphadenopathy, and certain tumors in China. In Western medicine, Podophyllum was first used medically as a laxative in the early 19th century. Since 1940, the resin of podophyllum has also been used topically for various skin lesions, such as warts and condyloma. Human poisonings have been reported.An animal model was established to investigate the neurotoxic effects of Bajiaolian. Podophyllotoxin, the major active ingredient in Podophyllum, was injected (ip) to young adult male rats at doses of 0, 5, 10, or 15 mg-kg-1 b.w.. The animals were sacrificed 72 h after injection.Neuronal changes were readily observable in animals treated with 10 or 15 mg-kg-1 of the toxin. Edematous changes of the anterior horn motoneurons were observed in the spinal cord. No neuronal necrosis was found. The type of neuronal swelling is believed to be only a transient change and would probably subside with time if no further assaults occur. More serious and perhaps longer term of changes were found in the dorsal ganglion neurons and the nerve fibers (axons) in the central and peripheral nervous system. Severe depletion of the Nissl substance (RNA/polyribosomes) was observed in the dorsal root ganglion neurons. Alterations in these sensory neurons would give rise to and correlate with the sensory disturbances experienced by the patients. Bodian staining also revealed a dose-related increase in the coarseness (thickness) of the nerve fibers (axons) in the cerebellum, cerebral cortex, brainstem, and spinal cord.This is the first scientific study showing the neurotoxicity of Bajiaolian, a commonly used Chinese herbal medicine. Toxicities on other organ systems by this drug certainly exist. Caution should be exercised in the dispensing and usage of this medicine. 展开更多
关键词 Bajiaolian Effects on the Nervous System Experimental Podophyllotoxin POISONING
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Experimental Podophyllotoxin (Bajiaolian) Poisoning:——Ⅱ. Effects on the Liver, Intestine, Kidney, Pancreas and Testis 被引量:2
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作者 LOUISW.cHANG c.M.yang +1 位作者 c.F.cHEN J.F.DENG 《Biomedical and Environmental Sciences》 SCIE CAS CSCD 1992年第4期293-302,共10页
Young male rats were orally intubated with podophyllotoxin: Group I, control animals, orally fed with vehicle only; Group Ⅱ, fed with an initial dose of 5 mg.kg-1 b.w., followed by a daily dose of 1.67 mg-kg-1 b.w. f... Young male rats were orally intubated with podophyllotoxin: Group I, control animals, orally fed with vehicle only; Group Ⅱ, fed with an initial dose of 5 mg.kg-1 b.w., followed by a daily dose of 1.67 mg-kg-1 b.w. for 7d. Group III, fed with an initial dose of 15 mg.kg-1 b.w., followed by a daily dose of 5 mg.kg-1 b.w. for 7d. All animals were sacrificed 72 h after the last dosing.Histopathological examination revealed dose-related fatty change of the liver, atrophy andi degenerative changes of the intestinal epithelial linings and testicular seminiferous tubules. Depletion of the pancreatic acinar cell granules was also apparent in the Group III animals. No pathology, however, was observed in the kidneys. The present study demonstrated for the first time degenerative changes in the liver, intestine, testis, and pancreas of animals ingested podophyllotoxin. These pathological changes correlate well with the clinical signs/symptoms of abnormal liver function, abdominal pain and diarrhea, and reduced serum amylase in humans poisonded by podophyllum. Inhibition of protein synthesis and mitosis (disruption of microtubules) are believed to be the underlying mechanisms of these changes observed in the animals intoxicated by. podophyllotoxin. 展开更多
关键词 Bajiaolian Effects on the Liver Experimental Podophyllotoxin KIDNEY POISONING
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MICROBRIDGE TESTING OF YOUNG'S MODULUS AND RESIDUAL STRESS OF NICKEL FILM ELECTROPLATED ON SILICON WAFER
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作者 Y.Zhou c.S.yang +5 位作者 J.A. chen G.F. Ding L. Wang M.J Wang Y.M Zhang T.H Zhang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2004年第3期247-254,共8页
Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.I... Microbridge testing is used to measure the Young's modulus and residual stresses of metallic films.Nickel film microbridges with widths of several hundred microns are fabricated by Microelectromechanical Systems.In order to measure the mechanical properties of nickel film microbridges,special shaft structure is designed to solve the problem of getting the load--deflection curves of metal film microbridge by Nanoin--denter XP system with normal Berkovich probe.Theoretical analysis of the micro--bridge load--deflection curve is proposed to evaluate the Young's modulus and residual stress of the films simultaneously.The calculated results based on the experimental measurements show that the average Young's modulus and residual stress are around 190GPa and 175MPa respectively,while the Young's modulus measured by Nano-hardness method on nickel film with silicon substrate is 186.8±7.34GPa. 展开更多
关键词 nickel film microbridge MEMS mechanical property loadeflection measurement
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Observation of the Crab Nebula with LHAASO-KM2A−a performance study 被引量:9
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作者 F.Aharonian Q.An +157 位作者 Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi H.cai J.T.cai Z.cao J.chang J.F.chang X.c.chang B.M.chen J.chen L.chen M.J.chen M.L.chen Q.H.chen S.H.chen S.Z.chen T.L.chen X.L.chen Y.chen N.cheng Y.D.cheng S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai D.della Volpe B.D'Ettorre Piazzoli X.J.Dong J.H.Fan Y.Z.Fan Z.X.Fan J.Fang K.Fang c.F.Feng L.Feng S.H.Feng Y.L.Feng B.Gao c.D.Gao Q.Gao W.Gao M.M.Ge L.S.Geng G.H.Gong Q.B.Gou M.H.Gu J.G.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He J.c.He S.L.He X.B.He Y.He M.Heller Y.K.Hor c.Hou X.Hou H.B.Hu S.Hu S.c.Hu X.J.Hu D.H.Huang Q.L.Huang W.H.Huang X.T.Huang Z.c.Huang F.Ji X.L.Ji H.Y.Jia K.Jiang Z.J.Jiang c.Jin D.Kuleshov K.Levochkin B.B.Li c.Li F.Li H.B.Li H.c.Li H.Y.Li J.Li K.Li W.L.Li X.Li X.R.Li Y.Li Y.Z.Li Z.Li E.W.Liang Y.F.Liang S.J.Lin B.Liu c.Liu D.Liu H.Liu H.D.Liu J.Liu J.L.Liu J.S.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.N.Liu Z.X.Liu W.J.Long R.Lu H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.c.Nan B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi D.Ruffolo V.Rulev A.Sáiz L.Shao O.Shchegolev X.D.Sheng J.R.Shi H.c.Song Yu.V.Stenkin V.Stepanov Q.N.Sun X.N.Sun Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian B.D.Wang c.Wang H.Wang H.G.Wang J.c.Wang J.S.Wang L.P.Wang L.Y.Wang R.N.Wang W. 《Chinese Physics C》 SCIE CAS CSCD 2021年第2期518-530,共13页
A sub-array of the Large High Altitude Air Shower Observatory(LHAASO),KM2A is mainly designed to observe a large fraction of the northern sky to hunt for γ-ray sources at energies above 10 TeV.Even though the detecto... A sub-array of the Large High Altitude Air Shower Observatory(LHAASO),KM2A is mainly designed to observe a large fraction of the northern sky to hunt for γ-ray sources at energies above 10 TeV.Even though the detector construction is still underway,half of the KM2A array has been operating stably since the end of 2019.In this paper,we present the KM2A data analysis pipeline and the first observation of the Crab Nebula,a standard candle in very high energy γ-ray astronomy.We detect γ-ray signals from the Crab Nebula in both energy ranges of 10-100 TeV and>100 TeV with high significance,by analyzing the KM2A data of 136 live days between December 2019 and May 2020.With the observations,we test the detector performance,including angular resolution,pointing accuracy and cosmic-ray background rejection power.The energy spectrum of the Crab Nebula in the energy range 10-250 TeV fits well with a single power-law function dN/dE=(1.13±0.05stat±0.08sys)×10^(-14).(E/20 TeV)-309±0.06stat±0.02syscm^(-2) s^(-1) TeV^(-1).It is consistent with previous measurements by other experiments.This opens a new window of γ-ray astronomy above 0.1 PeV through which new ultrahigh-energy γ-ray phenomena,such as cosmic PeVatrons,might be discovered. 展开更多
关键词 Γ-RAY Crab Nebula extensive air showers cosmic rays
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加速重离子辐射对水稻的生物学效应研究——Ⅰ.加速重离子及^(60)Coγ射线辐照水稻干种子的当代生物学效应 被引量:11
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作者 刘振声 丘泉发 +2 位作者 黄文忠 梅曼彤 T.c.H.yang 《辐射研究与辐射工艺学报》 CAS CSCD 北大核心 1991年第3期139-144,共6页
用高传能线密度(LET)的^(56)Fe(190keV/μ)、^(40)Ar(90keV/μ)离子束及低LET的^(60)Coγ射线(0.27keV/μ)照射水稻干种子,对当代幼苗生长、根尖微核细胞率和染色体畸变率的效应,进行了实验分析。结果表明:对比三种辐射源,微核细胞率与... 用高传能线密度(LET)的^(56)Fe(190keV/μ)、^(40)Ar(90keV/μ)离子束及低LET的^(60)Coγ射线(0.27keV/μ)照射水稻干种子,对当代幼苗生长、根尖微核细胞率和染色体畸变率的效应,进行了实验分析。结果表明:对比三种辐射源,微核细胞率与染色体畸变率均随处理剂量增加而增加,且呈线性关系。以幼苗的生长半抑制剂量(D_(50))为指标,三种电离辐射(^(56)Fe、^(40)Ar离子束和^(60)Coγ射线)的相对生物学效应(RBE)比值为6.3∶1.9∶1。以微核细胞率为指标,三者的RBE比较值为11∶4∶1。可见高LET的^(56)Fe和^(40)Ar比低LET的^(60)Co有较高的辐射生物学效应,尤其是在诱发细胞核染色体畸变和微核出现方面,高LET离子束有很高的效率。 展开更多
关键词 重离子 辐射 水稻 生物学效应
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Effect of trace Ni addition on microstructure,mechanical and corrosion properties of the extruded Mg-Gd-Y-Zr-Ni alloys for dissoluble fracturing tools 被引量:14
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作者 J.Wang T.Li +4 位作者 H.X.Li Y.Z.Ma K.N.Zhao c.L.yang J.S.Zhang 《Journal of Magnesium and Alloys》 SCIE EI CAS CSCD 2021年第5期1649-1660,共12页
Magnesium alloys,a novel functional material for the fabrication of fracturing tools,are being paid more and more attentions recently due to their relatively high mechanical properties and fast dissolubility ability a... Magnesium alloys,a novel functional material for the fabrication of fracturing tools,are being paid more and more attentions recently due to their relatively high mechanical properties and fast dissolubility ability after fracturing.In this study,the novel extruded Mg-10Gd-3Y-0.3Zr-xNi alloys will be reported and their microstructure,mechanical and corrosion behaviors will be also studied.The results show that Ni contents influence phase precipitation behaviors.With adding 0.2 wt%Ni,a large amount of Zr_(7)Ni_(10)phases will be precipitated insidesα-Mg matrix,directly leading to degradation of strength and large corrosion rate.With further increasing Ni contents,the precipitation phases can be changed from Mg_(5)RE to 18R-LPSO structure,resulting in higher mechanical properties and faster corrosion rate.Moreover,adding Ni element also change the texture orientation by influencing the precipitation behavior of the alloys.The alloys invented in this paper have attained the highest compressive and tensile properties among all the reported dissoluble magnesium alloys.This work is beneficial in understanding the role of Ni in the magnesium alloys and provides more materials alternatives for the fabrication of dissoluble fracturing tools. 展开更多
关键词 Dissoluble magnesium alloys MICROSTRUCTURE Mechanical properties Corrosion behaviors Fracturing tools
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Optimization of performance of the KM2A full array using the Crab Nebula
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作者 曹臻 F.Aharonian +144 位作者 安琪 阿西克古 白云翔 包逸炜 D.Bastieri 毕效军 毕玉江 蔡金庭 曹晴 曹文羽 曹喆 常进 常劲帆 陈尚明 陈恩生 陈亮 陈林 陈龙 陈明君 陈玛丽 陈起辉 陈素弘 陈天禄 陈阳 程宁 程耀东 崔明阳 崔树旺 崔晓红 崔昱东 戴本忠 代洪亮 戴子高 单增罗布 D.della Volpe 董绪强 段凯凯 樊军辉 范一中 方军 方堃 冯存峰 封莉 冯少辉 丰晓婷 冯有亮 S.Gabici 高博 高川东 高林青 高启 高卫 高伟康 葛茂茂 耿利斯 G.Giacinti 龚光华 苟全补 顾旻皓 郭福来 郭晓磊 郭义庆 郭莹莹 韩毅昂 何会海 贺昊宁 何佳银 何新波何钰 M.Heller 贺远强 侯博文 侯超 侯贤 胡红波 胡铨 胡世聪 黄代绘 黄天奇 黄文俊 黄性涛 黄晓渊 黄勇 黄志成 季筱璐 贾焕玉 贾康 江琨 姜晓巍 姜泽军 金敏 康明铭 柯通 D.Kuleshov.K.Kurinov 李兵兵 李澄 李骢 李丹 李飞 李海波 李会财 李华阳 李军 李剑 李捷 李凯 李文龙 李文莲 李秀荣 李昕 李一卓 李哲 黎卓 梁恩维 梁云峰 林苏杰 刘冰 刘成 刘栋 刘虎 刘海东 刘佳 刘江来 刘金艳 刘茂元 柳若愚 刘四明 刘伟 刘怡 刘以农 鲁睿 罗晴 吕洪魁 马伯强 马玲玲 马欣华 毛基荣 闵振 W.Mitthumsiri 穆慧君 南云程 A.Neronov 区子维 庞彬宇 P.Pattarakijwanich 裴致远 《Chinese Physics C》 SCIE CAS CSCD 2024年第6期169-178,共10页
The full array of the Large High Altitude Air Shower Observatory(LHAASO)has been in operation since July 2021.For its kilometer-square array(KM2A),we optimized the selection criteria for very high and ultrahigh energy... The full array of the Large High Altitude Air Shower Observatory(LHAASO)has been in operation since July 2021.For its kilometer-square array(KM2A),we optimized the selection criteria for very high and ultrahigh energyγ-rays using data collected from August 2021 to August 2022,resulting in an improvement in significance of the detection in the Crab Nebula of approximately 15%,compared with that of previous cuts.With the implementation of these new selection criteria,the angular resolution was also significantly improved by approximately 10%at tens of TeV.Other aspects of the full KM2A array performance,such as the pointing error,were also calibrated using the Crab Nebula.The resulting energy spectrum of the Crab Nebula in the energy range of 10-1000 TeV are well fitted by a log-parabola model,which is consistent with the previous results from LHAASO and other experiments. 展开更多
关键词 Γ-RAY Crab Nebula SIGNIFICANCE
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Flux variations of cosmic ray air showers detected by LHAASO-KM2A during a thunderstorm on June 10,2021
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作者 F.Aharonian 安琪 +161 位作者 阿西克古 白立新 白云翔 包逸炜 D.Bastieri 毕效军 毕玉江 蔡金庭 曹喆 曹臻 常进 常劲帆 陈恩生 陈良 陈亮 陈龙 陈明君 陈玛丽 陈素弘 陈松战 陈天禄 陈学健 陈阳 程皓麟 程宁 程耀东 崔树旺 崔晓红 崔昱东 戴本忠 代洪亮 戴子高 单增罗布 D.della Volpe 段凯凯 樊军辉 范一中 范志香 方军 方堃 冯存峰 封莉 冯少辉 丰晓婷 冯有亮 高博 高川东 高林青 高启 高卫 高伟康 葛茂茂 耿利斯 龚光华 苟全补 顾旻皓 郭福来 郭俊广 郭晓磊 郭义庆 郭莹莹 韩毅昂 何会海 贺昊宁 何思乐 何新波 何钰 M.Heller 贺远强 侯超 侯贤 胡红波 胡铨 胡森 胡世聪 呼晓军 黄代绘 黄文昊 黄性涛 黄晓渊 黄勇 黄志成 季筱璐 贾焕玉 贾康 江琨 姜泽军 金敏 康明铭 柯通 D.Kuleshov 李兵兵 李澄 李骢 李飞 李海波 李会财 李华阳 李军 李剑 李捷 李凯 李文龙 李秀荣 李昕 李新 李一卓 李哲 黎卓 梁恩维 梁云峰 林苏杰 刘冰 刘成 刘栋 刘虎 刘海东 刘佳 刘江来 刘佳松 刘金艳 刘茂元 柳若愚 刘四明 刘伟 刘怡 刘以农 龙文杰 鲁睿 罗晴 吕洪魁 马伯强 马玲玲 马欣华 毛基荣 A.Masood 闵振 W.Mitthumsiri 南云程 区子维 庞彬宇 P.Pattarakijwanich 裴致远 齐孟尧 祁业情 乔冰强 秦家军 D.Ruffolo A.Sáiz 邵澄宇 邵琅 O.Shchegolev 盛祥东 石京燕 宋慧超 Yu.V.Stenkin V.Stepanov 苏扬 孙秦宁 孙晓娜 孙志斌 《Chinese Physics C》 SCIE CAS CSCD 2023年第1期193-203,共11页
The Large High Altitude Air Shower Observatory(LHAASO)has three sub-arrays,KM2A,WCDA,and WFCTA.The flux variations of cosmic ray air showers were studied by analyzing the KM2A data during a thunderstorm on June 10,202... The Large High Altitude Air Shower Observatory(LHAASO)has three sub-arrays,KM2A,WCDA,and WFCTA.The flux variations of cosmic ray air showers were studied by analyzing the KM2A data during a thunderstorm on June 10,2021.The number of shower events that meet the trigger conditions increases significantly in atmospheric electric fields,with a maximum fractional increase of 20%.The variations in trigger rates(increases or decreases)were found to be strongly dependent on the primary zenith angle.The flux of secondary particles increased significantly,following a trend similar to that of shower events.To better understand the observed behavior,Monte Carlo simulations were performed with CORSIKA and G4KM2A(a code based on GEANT4).We found that the experimental data(in saturated negative fields)were in good agreement with the simulations,assuming the presence of a uniform electric field of-700 V/cm with a thickness of 1500 m in the atmosphere above the observation level.Due to the acceleration/deceleration by the atmospheric electric field,the number of secondary particles with energy above the detector threshold was modified,resulting in the changes in shower detection rate. 展开更多
关键词 THUNDERSTORM cosmic rays extensive air showers LHAASO-KM2A
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Performance of LHAASO-WCDA and observation of the Crab Nebula as a standard candle 被引量:4
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作者 F.Aharonian Q.An +158 位作者 Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi H.cai J.T.cai Z.cao Z.cao J.chang J.F.chang X.c.chang B.M.chen J.chen L.chen L.chen L.chen M.J.chen M.L.chen Q.H.chen S.H.chen S.Z.chen T.L.chen X.L.chen Y.chen N.cheng Y.D.cheng S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu D.della Volpe B.D'Ettorre Piazzoli X.J.Dong J.H.Fan Y.Z.Fan Z.X.Fan J.Fang K.Fang c.F.Feng L.Feng S.H.Feng Y.L.Feng B.Gao c.D.Gao Q.Gao W.Gao M.M.Ge L.S.Geng G.H.Gong Q.B.Gou M.H.Gu J.G.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He J.c.He S.L.He X.B.He Y.He M.Heller Y.K.Hor c.Hou X.Hou H.B.Hu S.Hu S.c.Hu X.J.Hu D.H.Huang Q.L.Huang W.H.Huang X.T.Huang Z.c.Huang F.Ji X.L.Ji H.Y.Jia K.Jiang Z.J.Jiang c.Jin D.Kuleshov K.Levochkin B.B.Li c.Li c.Li F.Li H.B.Li H.c.Li H.Y.Li J.Li K.Li W.L.Li X.Li X.Li X.R.Li Y.Li Y.Z.Li Z.Li Z.Li E.W.Liang Y.F.Liang S.J.Lin B.Liu c.Liu D.Liu H.Liu H.D.Liu J.Liu J.L.Liu J.S.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.N.Liu Z.X.Liu W.J.Long R.Lu H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.c.Nan B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi B.Q.Qiao D.Ruffolo V.Rulev A.Saiz L.Shao O.Shchegolev X.D.Sheng J.R.Shi H.c.Song Yu.V.Stenkin V.Stepanov Q.N.Sun X.N.Sun Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian B.D.Wang c.Wang H.Wang 《Chinese Physics C》 SCIE CAS CSCD 2021年第8期166-181,共16页
The first Water Cherenkov detector of the LHAASO experiment(WCDA-1)has been operating since April 2019.The data for the first year have been analyzed to test its performance by observing the Crab Nebula as a standard ... The first Water Cherenkov detector of the LHAASO experiment(WCDA-1)has been operating since April 2019.The data for the first year have been analyzed to test its performance by observing the Crab Nebula as a standard candle.The WCDA-1 achieves a sensitivity of 65 mCU per year,with a statistical threshold of 5 cr.To accomplish this,a 97.7%cosmic-ray background rejection rate around 1 TeV and 99.8%around 6 TeV with an ap proximate photon acceptance of 50%is achieved after applying an algorithm to separate gamma-induced showers.The angular resolution is measured using the Crab Nebula as a point source to be approximately 0.45°at 1 TeV and better than 0.2°above 6 TeV,with a pointing accuracy better than 0.05°.These values all match the design specifications.The energy resolution is found to be 33%for gamma rays around 6 TeV.The spectral energy distribution of the Crab Nebula in the range from 500 GeV to 15.8 TeV is measured and found to be in agreement with the results from other TeV gamma ray observatories. 展开更多
关键词 LHAASO-WCDA Crab Nebula angular resolution spectral energy distribution
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INVESTIGATION ON MICROSTRUCTURE AND TRIBOLOGICAL PROPERITIES OF CORED WIRE ARC SPRAYED Al/Al _2 O_3 COATINGS 被引量:7
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作者 Y.L.Zhu,S.N.Ma,c.H.yang and R.F.Fu Surface Engineering Research Inst., cMES, Beijing 100072,china 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1999年第5期988-994,共7页
Cored wires for electric arc spraying of Al/Al 2 O 3 MMC coatings were developed, with Al 2 O 3 powder as the core material and commercial aluminium strip as the retaining sheath. The bond strength, ... Cored wires for electric arc spraying of Al/Al 2 O 3 MMC coatings were developed, with Al 2 O 3 powder as the core material and commercial aluminium strip as the retaining sheath. The bond strength, Al 2 O 3 content, microstructure, micro-hardness and wear resistance of coatings produced by arc spraying of the cored wires were experimentally investigated and were compared with those of pure aluminum coating. 展开更多
关键词 AL 2 O 3 aluminium coating arc spray cored wire
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Reconstruction of Cherenkov image bymultiple telescopes of LHAASO-WFCTA
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作者 F.Aharonian Q.An +156 位作者 Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi J.T.cai Zhe cao Zhen cao J.chang J.F.chang E.S.chen Liang chen Liang chen Long chen M.J.chen M.L.chen Q.H.chen S.H.chen S.Z.chen T.L.chen Y.chen H.L.cheng N.cheng Y.D.cheng S.W.cui X.H.cui Y.D.cui B.D’Ettorre Piazzoli B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu Ddella Volpe K.K.Duan J.H.Fan Y.Z.Fan Z.X.Fan J.Fang K.Fang c.F.Feng L.Feng S.H.Feng X.T.Feng Y.L.Feng B.Gao c.D.Gao L.Q.Gao Q.Gao W.Gao W.K.Gao M.M.Ge L.S.Geng G.H.Gong Q.B.Gou M.H.Gu F.L.Guo J.G.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He S.L.He X.B.He Y.He M.Heller Y.K.Hor c.Hou X.Hou H.B.Hu Q.Hu S.Hu S.c.Hu X.J.Hu D.H.Huang W.H.Huang X.T.Huang X.Y.Huang Y.Huang Z.c.Huang X.L.Ji H.Y.Jia K.Jia K.Jiang Z.J.Jiang M.Jin M.M.Kang T.Ke D.Kuleshov K.Levochkin B.B.Li cheng Li cong Li F.Li H.B.Li H.c.Li H.Y.Li J.Li Jian Li Jie Li K.Li WLLi XRLi Xin Li Xin Li YZLi Zhe Li Zhuo Li E.W.Liang Y.F.Liang S.J.Lin B.Liu c.Liu D.Liu H.Liu H.D.Liu J.Liu J.L.Liu J.S.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.Liu Y.N.Liu W.J.Long R.Lu Q.Luo H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao A.Masood Z.Min W.Mitthumsiri Y.c.Nan Z.W.Ou B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi Y.Q.Qi B.Q.Qiao J.J.Qin D.Ruffolo A.Sáiz c.Y.Shao L.Shao O.Shchegolev X.D.Sheng J.Y.Shi H.c.Song 《Radiation Detection Technology and Methods》 CSCD 2022年第4期544-557,共14页
Introduction One of main scientific goals of the Large High Altitude Air Shower Observatory(LHAASO)is to accurately measure the energy spectra of different cosmic ray compositions around the‘knee’region.The Wide Fiel... Introduction One of main scientific goals of the Large High Altitude Air Shower Observatory(LHAASO)is to accurately measure the energy spectra of different cosmic ray compositions around the‘knee’region.The Wide Field-of-View(FoV)Cherenkov Telescope Array(WFCTA),which is one of the main detectors of LHAASO and has 18 telescopes,is built to achieve this goal.Multiple telescopes are put together and point to connected directions for a larger FoV.Method Telescopes are deployed spatially as close as possible,but due to their own size,the distance between two adjacent telescopes is about 10 m.Therefore,the Cherenkov lateral distribution and the parallax between the two telescopes should be considered in the event building process for images crossing over the boundaries of FoVs of the telescopes.An event building method for Cherenkov images measured by multiple telescopes of WFCTA is developed.The performance of the shower measurements using the combined images is evaluated by comparing with showers that are fully contained by a virtual telescope in simulation.Results and conclusion It is proved that the developed event building process can help to increase the FoV of WFCTA by 30%while maintaining the same reconstruction quality,compared to the separate telescope reconstruction method. 展开更多
关键词 METHOD DIRECTIONS CONCLUSION
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Search for electron-antineutrinos associated with gravitational-wave events GW150914,GW151012,GW151226,GW170104,GW170608,GW170814,and GW170817 at Daya Bay 被引量:1
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作者 F.P.An A.B.Balantekin +164 位作者 H.R.Band M.Bishai S.Blyth G.F.cao J.cao J.F.chang Y.chang H.S.chen S.M.chen Y.chen Y.X.chen J.cheng Z.K.cheng J.J.cherwinka M.c.chu J.P.cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong W.Q.Gu J.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans M.He K.M.Heeger Y.K.Heng A.Higuera Y.K.Hor Y.B.Hsiung B.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.Huang X.T.Huang Y.B.Huang P.Huber D.E.Jaffe K.L.Jen X.L.Ji X.P.Ji R.A.Johnson D.Jones L.Kang S.H.Kettell S.Kohn M.Kramer T.J.Langford J.Lee J.H.c.Lee R.T.Lei R.Leitner J.K.c.Leung F.Li J.J.Li Q.J.Li S.Li S.c.Li W.D.Li X.N.Li X.Q.Li Y.F.Li Z.B.Li H.Liang c.J.Lin G.L.Lin S.Lin J.J.Ling J.M.Link L.Littenberg B.R.Littlejohn J.c.Liu J.L.Liu c.Lu H.Q.Lu J.S.Lu K.B.Luk X.B.Ma X.Y.Ma Y.Q.Ma c.Marshall D.A.Martinez caicedo K.T.MeDonald R.D.McKeown Y.Meng J.Napolitano D.Naumov E.Naumova J.P.Ochoa-Ricoux A.OIshevskiy H.-R.Pan J.Park S.Patton J.c.Peng c.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren c.Morales Reveco R.Rosero B.Roskovec X.c.Ruan H.Steiner J.L.Sun T.Tmej K.Treskov W.-H.Tse c.E.Tull B.Viren V.Vorobel c.H.Wang J.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.J.Wen K.Whisnant c.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing J.L.Xu T.Xu T.Xue c.G.yang L.yang Y.Z.yang H.F.Yao M.Ye M.Yeh B.L.Young H.Z.Yu Z.Y.Yu B 《Chinese Physics C》 SCIE CAS CSCD 2021年第5期190-201,共12页
The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars merge.In t... The establishment of a possible connection between neutrino emission and gravitational-wave(GW)bursts is important to our understanding of the physical processes that occur when black holes or neutron stars merge.In the Daya Bay experiment,using the data collected from December 2011 to August 2017,a search was per-formed for electron-antineutrino signals that coincided with detected GW events,including GW150914,GW151012,GW151226,GW170104,GW170608,GW 170814,and GW 170817.We used three time windows of±10,±500,and±1000 s relative to the occurrence of the GW events and a neutrino energy range of 1.8 to 100 MeV to search for correlated neutrino candidates.The detected electron-antineutrino candidates were consistent with the expected background rates for all the three time windows.Assuming monochromatic spectra,we found upper limits(90%confidence level)of the electron-antineutrino fluence of(1.13-2.44)×10^(11)cm^(-2)at 5 MeV to 8.0×10^(7)cm^(-2)at 100 MeV for the three time w indows.Under the assumption of a Fermi-Dirac spectrum,the upper limits were found to be(5.4-7.0)×10^(9)cm^(2)for the three time windows. 展开更多
关键词 grav itational waves electron-antineutrinos FLUENCE upper limit
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Geometrical reconstruction of fluorescence events observed by the LHAASO experiment 被引量:1
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作者 F.Aharonian Q.An +159 位作者 Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi H.cai J.T.cai Z.cao Z.cao J.chang J.F.chang X.c.chang B.M.chen J.chen L.chen L.chen L.chen M.J.chen M.L.chen Q.H.chen S.H.chen S.Z.chen T.L.chen X.L.chen Y.chen N.cheng Y.D.cheng S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu D.della Volpe B.DEtorre Piazzoli X.J.Dong J.H.Fan Y.Z.Fan Z.X.Fan J.Fang J.Fang c.F.Feng L.Feng S.H.Feng Y.L.Feng B.Gao c.D.Gao Q.Gao W.Gao M.M.Ge L.S.Geng G.H.Gong Q.B.Gou M.H.Gu J.G.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He J.c.He S.L.He X.B.He Y.He M.Heller Y.K.Hor c.Hou X.Hou H.B.Hu S.Hu S.c.Hu X.J.Hu D.H.Huang Q.L.Huang W.H.Huang X.T.Huang Z.c.Huang F.Ji X.L.Ji H.Y.Jia K.Jiang Z.J.Jiang c.Jin D.Kuleshov K.Levochkin B.B.Li c.Li c.Li F.Li H.B.Li H.c.Li H.Y.Li J.Li K.Li W.L.Li X.Li X.Li X.R.Li Y.Li Y.Z.Li Z.Li Z.Li E.W.Liang Y.F.Liang S.J.Lin B.Liu c.Liu D.Liu H.Liu H.D.Liu J.Liu J.L.Liu J.L.Liu J.S.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.N.Liu Z.X.Liu W.J.Long R.Lu H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.c.Nan B.Y..Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi D.Ruffolo V.Rulev A.Saiz L.Shao O.Shchegolev X.D.Sheng J.R.Shi H.c.Song Yu.V.Stenkin V.Stepanov Q.N.Sun X.N.Sun Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian B.D.Wang c.Wang H.Wang H 《Chinese Physics C》 SCIE CAS CSCD 2021年第4期416-425,共10页
The LHAASO-WFCTA experiment,which aims to observe cosmic rays in the sub-EeV range using the fluorescence technique,uses a new generation of high-performance telescopes.To ensure that the experiment has ex-cellent det... The LHAASO-WFCTA experiment,which aims to observe cosmic rays in the sub-EeV range using the fluorescence technique,uses a new generation of high-performance telescopes.To ensure that the experiment has ex-cellent detection capability associated with the measurement of the energy spectrum,the primary composition of cosmic rays,and so on,an accurate geometrical reconstruction of air-shower events is fundamental.This paper de-scribes the development and testing of geometrical reconstruction for stereo viewed events using the WFCTA(Wide Field of view Cherenkov/Fluorescence Telescope Array)detectors.Two approaches,which take full advantage ofthe WFCTA detectors.are investigated.One is the stereo-angular method,which uses the pointing of triggered SiPMs in the shower trajectory,and the other is the stereo-timing method,which uses the triggering time of the fired SiPMs.The results show that both methods have good geometrical resolution:the resolution of the stereo-timing method is slightly better than the stereo-angular method because the resolution of the latter is slightly limited by the shower track length. 展开更多
关键词 cosmic ray fluorescence telescope stereo observation geometrical reconstruction
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Prospects for a multi-TeV gamma-ray sky survey with the LHAASO water Cherenkov detector array
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作者 F.Aharonian V.Alekseenko +161 位作者 Q.An Axikegu L.X.Bai Y.W.Bao D.Bastieri9 X.J.Bi H.cai Zhe cao Zhen cao J.chang J.F.chang X.c.chang S.P.chao B.M.chen J.chen L.chen L.chen M.L.chen M.J.chen Q.H.chen S.H.chen S.Z.chen T.L.chen X.L.chen Y.chen N.cheng Y.D.cheng S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu B.D'Ettorre Piazzoli J.Fang J.H.Fan Y.Z.Fan c.F Feng L.Feng S.H.Feng Y.L.Feng B.Gao Q.Gao W.Gao M.M.Ge L.S.Geng G.H.Gong Q.B.Gou M.H.Gu Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He J.c.He M.Heller S.L.He Y.He c.Hou D.H.Huang Q.L.Huang W.H.Huang X.T.Huang H.B.Hu S.Hu H.Y.Jia K.Jiang F.Ji c.Jin X.L.Ji K.Levochkin E.W.Liang Y.F Liang cheng Li cong Li F.Li H.Li H.B.Li H.c.Li H.M.Li J.Li K.Li W.L.Li X.Li X.R.Li Y.Li Z.Li Z.Li B.Liu c.Liu D.Liu H.D.Liu H.Liu J.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.N.Liu Z.X.Liu W.J.Long R.Lu H.K.Lv B.Q.Ma L.L.Ma J.R.Mao A.Masood X.H.Ma W.Mitthumsiri T.Montaruli Y.c.Nan P.Pattarakijwanich Z.Y.Pei B.Q.Qiao M.Y.Qi D.Ruffolo V.Rulev A.Sáiz L.Shao O.Shchegolev X.D.Sheng J.R.Shi Y.Stenkin V.Stepanov Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian D.D.Volpe c.Wang H.Wang H.G.Wang J.c.Wang L.Y.Wang W.Wang W.Wang X.G.Wang X.Y.Wang X.J.Wang Y.D.Wang Y.J.Wang Y.N.Wang Y.P.Wang Z.Wang Z.H.Wang Z.X.Wang D.M.Wei J.J.Wei T.Wen c.Y.Wu H.R.Wu S.Wu W.X.Wu X.F.Wu G.M.Xiang G.Xiao G.G.Xin Y.Xing R.X.Xu L.Xue D.H.Ya 《Chinese Physics C》 SCIE CAS CSCD 2020年第6期123-132,共10页
The Water Cherenkov Detector Array(WCDA) is a major component of the Large High Altitude Air Shower Array Observatory(LHAASO), a new generation cosmic-ray experiment with unprecedented sensitivity, currently under con... The Water Cherenkov Detector Array(WCDA) is a major component of the Large High Altitude Air Shower Array Observatory(LHAASO), a new generation cosmic-ray experiment with unprecedented sensitivity, currently under construction. WCDA is aimed at the study of TeV γ-rays. In order to evaluate the prospects of searching for TeV γ-ray sources with WCDA, we present a projection of the one-year sensitivity of WCDA to TeV γ-ray sources from TeVCat using an all-sky approach. Out of 128 TeVCat sources observable by WCDA up to a zenith angle of 45°, we estimate that 42 would be detectable in one year of observations at a median energy of 1 TeV. Most of them are Galactic sources, and the extragalactic sources are Active Galactic Nuclei(AGN). 展开更多
关键词 TeVγ-ray astronomy observational prospect LHAASO-WCDA
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Antineutrino energy spectrum unfolding based on the Daya Bay measurement and its applications
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作者 F.P.An A.B.Balantekin +163 位作者 M.Bishai S.Blyth G.F.cao J.cao J.F.chang Y.chang H.S.chen S.M.chen Y.chen Y.X.chen J.cheng Z.K.cheng J.J.cherwinka M.c.chu J.P.cummings O.Dalager F.S.Deng Y.Y.Ding M.V.Diwan T.Dohnal D.Dolzhikov J.Dove M.Dvorak D.A.Dwyer J.P.Gallo M.Gonchar G.H.Gong H.Gong M.Grassi W.Q.Gu J.Y.Guo L.Guo X.H.Guo Y.H.Guo Z.Guo R.W.Hackenburg S.Hans a M.He K.M.Heeger Y.K.Heng Y.K.Hor Y.B.Hsiung B.Z.Hu J.R.Hu T.Hu Z.J.Hu H.X.Huang J.H.Huang X.T.Huang Y.B.Huang P.Huber D.E.Jaffe K.L.Jen X.L.Ji X.P.Ji R.A.Johnson D.Jones L.Kang S.H.Kettel S.Kohn M.Kramer T.J.Langford J.Lee J.H.c.Lee R.T.Lei R.Leitner J.K.c.Leung F.Li H.L.Li J.J.Li Q.J.Li R.H.Li S.Li S.c.Li W.D.Li X.N.Li X.Q.Li Y.F.Li Z.B.Li H.Liang c.J.Lin G.L.Lin S.Lin J.J.Ling J.M.Link26 L.Littenberg B.R.Littlejohn J.c.Liu J.L.Liu J.X.Liu c.Lu H.Q.Lu K.B.Luk B.Z.Ma X.B.Ma X.Y.Ma Y.Q.Ma R.c.Mandujano c.Marshall K.T.McDonald R.D.McKeown Y.Meng J.Napolitano D.Naumov E.Naumova T.M.T.Nguyen J.P.Ochoa-Ricoux A.Olshevskiy H.-R.Pan J.Park S.Patton J.c.Peng c.S.J.Pun F.Z.Qi M.Qi X.Qian N.Raper J.Ren c.Morales Reveco R.Rosero B.Roskovec X.c.Ruan H.Steiner J.L.Sun T.Tmej1 K.Treskov W.-H.Tse c.E.Tull B.Viren V.Vorobel c.H.Wang J.Wang M.Wang N.Y.Wang R.G.Wang W.Wang W.Wang X.Wang Y.Wang Y.F.Wang Z.Wang Z.Wang Z.M.Wang H.Y.Wei L.H.Wei L.J.Wen K.Whisnant c.G.White H.L.H.Wong E.Worcester D.R.Wu F.L.Wu Q.Wu W.J.Wu D.M.Xia Z.Q.Xie Z.Z.Xing H.K.Xu J.L.Xu T.Xu T.Xue c.G.yang L.yang Y.Z.yang 《Chinese Physics C》 SCIE CAS CSCD 2021年第7期1-19,共19页
The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision era.The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by ... The prediction of reactor antineutrino spectra will play a crucial role as reactor experiments enter the precision era.The positron energy spectrum of 3.5 million antineutrino inverse beta decay reactions observed by the Daya Bay experiment,in combination with the fission rates of fissile isotopes in the reactor,is used to extract the positron energy spectra resulting from the fission of specific isotopes.This information can be used to produce a precise,data-based prediction of the antineutrino energy spectrum in other reactor antineutrino experiments with different fission fractions than Daya Bay.The positron energy spectra are unfolded to obtain the antineutrino energy spectra by removing the contribution from detector response with the Wiener-SVD unfolding method.Consistent results are obtained with other unfolding methods.A technique to construct a data-based prediction of the reactor antineutrino energy spectrum is proposed and investigated.Given the reactor fission fractions,the technique can predict the energy spectrum to a 2%precision.In addition,we illustrate how to perform a rigorous comparison between the unfolded antineutrino spectrum and a theoretical model prediction that avoids the input model bias of the unfolding method. 展开更多
关键词 reactor antineutrino energy spectrum Daya Bay application
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A dynamic range extension system for LHAASOWCDA-1
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作者 F.Aharonian Q.An +158 位作者 Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi H.cai J.T.cai Z.cao Z.cao J.chang J.F.chang X.c.chang B.M.chen J.chen L.chen L.chen L.chen M.J.chen M.L.chen Q.H.chen S.H.chen S.Z.chen T.L.chen X.L.chen Y.chen N.cheng Y.D.cheng S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu D.della Volpe B.D’Ettorre Piazzoli X.J.Dong J.H.Fan Y.Z.Fan Z.X.Fan J.Fang K.Fang c.F.Feng L.Feng S.H.Feng Y.L.Feng B.Gao c.D.Gao Q.Gao W.Gao M.M.Ge L.S.Geng G.H.Gong Q.B.Gou M.H.Gu J.G.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He J.c.He S.L.He X.B.He Y.He M.Heller Y.K.Hor c.Hou X.Hou H.B.Hu S.Hu S.c.Hu X.J.Hu D.H.Huang Q.L.Huang W.H.Huang X.T.Huang Y.Huang Z.c.Huang F.Ji X.L.Ji H.Y.Jia K.Jiang Z.J.Jiang c.Jin D.Kuleshov K.Levochkin B.B.Li c.Li c.Li F.Li H.B.Li H.c.Li H.Y.Li J.Li K.Li W.L.Li X.Li X.Li X.R.Li Y.Li Y.Z.Li Z.Li Z.Li E.W.Liang Y.F.Liang S.J.Lin B.Liu c.Liu D.Liu H.Liu H.D.Liu J.Liu J.L.Liu J.S.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.N.Liu Z.X.Liu W.J.Long R.Lu H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.c.Nan B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi D.Ruffolo V.Rulev A.Sáiz L.Shao O.Shchegolev X.D.Sheng J.R.Shi H.c.Song Yu.V.Stenkin V.Stepanov Q.N.Sun X.N.Sun Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian B.D.Wang c.Wang H.Wan 《Radiation Detection Technology and Methods》 CSCD 2021年第4期520-530,共11页
Purpose The main scientific goal of LHAASO-WCDA is to survey gamma-ray sources with energy from 100 GeV to 30 TeV.To observe high-energy shower events,especially to measure the energy spectrum of cosmic rays from 100 ... Purpose The main scientific goal of LHAASO-WCDA is to survey gamma-ray sources with energy from 100 GeV to 30 TeV.To observe high-energy shower events,especially to measure the energy spectrum of cosmic rays from 100 TeV to 10 PeV,a dynamic range extension system(WCDA++)is designed to use a 1.5-inch PMT with a dynamic range of four orders of magnitude for each cell in WCDA-1.Method The dynamic range is extended by using these PMTs to measure the effective charge density in the core region of air shower events,which is an important parameter for identifying the composition of primary particles.Result and Conclusion The system has been running for more than one year.In this paper,the details of the design and performance of WCDA++are presented. 展开更多
关键词 LHAASO-WCDA WCDA++ Water Cherenkov detector PERFORMANCE
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Line-of-shower trigger method to lower energy threshold for GRB detection using LHAASO-WCDA
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作者 F.Aharonian Q.An +159 位作者 Axikegu L.X.Bai Y.X.Bai Y.W.Bao D.Bastieri X.J.Bi Y.J.Bi H.cai J.T.cai Z.cao Z.cao J.chang J.F.chang X.c.chan B.M.chen J.chen L.chen L.chen L.chen M.J.chen M.L.chen Q.H.chen S.H.chen S.Z.chen T.L.chen X.L.chen Y.chen N.chen Y.D.chen S.W.cui X.H.cui Y.D.cui B.Z.Dai H.L.Dai Z.G.Dai Danzengluobu D.della Volpe B.D’Ettorre Piazzoli X.J.Don J.H.Fan Y.Z.Fan Z.X.Fan J.Fang K.Fan c.F.Feng L.Feng S.H.Fen Y.L.Feng B.Gao c.D.Gao Q.Gao W.Gao M.M.Ge L.S.Gen G.H.Gong Q.B.Gou M.H.Gu J.G.Guo X.L.Guo Y.Q.Guo Y.Y.Guo Y.A.Han H.H.He H.N.He J.c.He S.L.He X.B.He Y.He M.Heller Y.K.Hor c.Hou X.Hou H.B.Hu S.Hu S.c.Hu X.J.Hu D.H.Huang Q.L.Huan W.H.Huang X.T.Huang Z.c.Huang F.Ji X.L.Ji H.Y.Jia K.Jiang Z.J.Jiang c.Jin D.Kuleshov K.Levochkin B.B.Li c.Li c.Li F.Li H.B.Li H.c.Li H.Y.Li J.Li K.Li W.L.Li X.Li X.Li X.R.Li Y.Li Y.Z.Li Z.Li Z.Li E.W.Liang Y.F.Liang S.J.Lin B.Liu c.Liu D.Liu H.Liu H.D.Liu J.Liu J.L.Liu J.S.Liu J.Y.Liu M.Y.Liu R.Y.Liu S.M.Liu W.Liu Y.N.Liu Z.X.Liu W.J.Long R.Lu H.K.Lv B.Q.Ma L.L.Ma X.H.Ma J.R.Mao A.Masood W.Mitthumsiri T.Montaruli Y.c.Nan B.Y.Pang P.Pattarakijwanich Z.Y.Pei M.Y.Qi D.Ruffolo V.Rulev A.Sáiz L.Shao O.Shchegolev X.D.Shen J.R.Shi H.c.Song Yu.V.Stenkin V.Stepanov Q.N.Sun X.N.Sun Z.B.Sun P.H.T.Tam Z.B.Tang W.W.Tian B.D.Wan c.Wang H.Wang H.G.Wang J.c.Wa 《Radiation Detection Technology and Methods》 CSCD 2021年第4期531-541,共11页
Purpose Observation of high energy and very high emission from Gamma Ray Bursts(GRBs)is crucial to study the gigantic explosion and the underline processes.With a large field-of-view and almost full duty cycle,the Wat... Purpose Observation of high energy and very high emission from Gamma Ray Bursts(GRBs)is crucial to study the gigantic explosion and the underline processes.With a large field-of-view and almost full duty cycle,the Water Cherenkov Detector Array(WCDA),a sub-array of the Large High Altitude Air Shower Observatory(LHAASO),is appropriate to monitor the very high energy emission from unpredictable transients such as GRBs.Method Nevertheless,the main issue for an extensive air shower array is the high energy threshold which limits the horizon of the detector.To address this issue a new trigger method is developed in this article to lower the energy threshold of WCDA for GRB observation.Result The proposed method significantly improves the detection efficiency of WCDA for gamma-rays around the GRB direction at 10-300 GeV.The sensitivity of the WCDA for GRB detection with the new trigger method is estimated.The achieved sensitivity of the quarter WCDA array above 10 GeV is comparable with that of Fermi-LAT.The data analysis process and corresponding fluence upper limit for GRB 190719C is presented as an example. 展开更多
关键词 LHAASO WCDA GRB
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分子束外延生长ZnSe自组织量子点光、电行为研究 被引量:5
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作者 卢励吾 王占国 +4 位作者 c.L.yang J.Wang Z.H.Ma I.K.Sou Weikun Ge 《物理学报》 SCIE EI CAS CSCD 北大核心 2002年第2期310-314,共5页
分别应用光致发光、电容 电压和深能级瞬态傅里叶谱技术详细研究ZnSe自组织量子点样品的光学和电学行为 .光致发光温度关系表明ZnSe量子点的光致发光热猝火过程机理 .两步猝火过程的理论较好模拟和解释了相关的实验数据 .电容 电压测... 分别应用光致发光、电容 电压和深能级瞬态傅里叶谱技术详细研究ZnSe自组织量子点样品的光学和电学行为 .光致发光温度关系表明ZnSe量子点的光致发光热猝火过程机理 .两步猝火过程的理论较好模拟和解释了相关的实验数据 .电容 电压测量表明样品表观载流子积累峰出现的深度 (样品表面下约 10 0nm处 )大约是ZnSe量子点层的位置 .深能级瞬态傅里叶谱获得的ZnSe量子点电子基态能级位置为ZnSe导带下的 0 11eV ,这与ZnSe量子点光致发光热猝火模型得到的结果一致 . 展开更多
关键词 Ⅱ-Ⅵ半导体 自组织量子点 ZNSE 分子束外延生长 光学特性 电学特性 硒化锌
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利用增强现实技术提高铁路运输装备故障诊断和维修效率 被引量:1
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作者 +3 位作者 李立东(翻译) 苏小珂(翻译) 《智慧轨道交通》 2023年第1期86-90,共5页
在重载运输领域,维修的安全性、效率和成本等方面面临诸多挑战。由于现在的机械和电气系统更加复杂,对更长寿命周期的需求增加,维修记录和说明在地理空间上呈分散状态,故上述挑战日趋增加。增强现实技术(AR)正成为严苛环境下为维修人员... 在重载运输领域,维修的安全性、效率和成本等方面面临诸多挑战。由于现在的机械和电气系统更加复杂,对更长寿命周期的需求增加,维修记录和说明在地理空间上呈分散状态,故上述挑战日趋增加。增强现实技术(AR)正成为严苛环境下为维修人员提供支持的理想工具。典型的增强现实技术系统通过交互界面将真实和虚拟对象连接在一起。本文介绍了为辅助重载运输装备维修而开发的基于增强现实技术的人机界面(HMI),模型包括三大件式重载货车转向架和矿石试验车状态监测系统的增强现实维护。增强现实技术系统自动识别对象(转向架部件),为维修人员提供了历史运用记录和维修安全工作说明书。为矿石试验车开发的增强现实模型概述了状态监测系统的布置和步进式故障诊断方法。运用实践表明;通过提供按需信息和取消纸质手册,可以提高现场工作效率;系统中显示的信息易于修改;可以推广到其他重载运输设备及其相应的运行需求。 展开更多
关键词 重载运输 增强现实技术 人机界面 故障诊断 维修
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Hydrodynamic simulations of directed flow for light hadrons in Au+Au and isobarcollisions at √SNN=200 GeV
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作者 靖晶 江泽方 +1 位作者 杨纯斌 张本威 《Chinese Physics C》 SCIE CAS CSCD 2023年第3期169-179,共11页
Using a(3+1)-D hydrodynamic model,CLVisc,we study the directed flow(vi)of light hadrons pro-duced in Au+Au,Ru+Ru,and Zr+Zr collisions at √SNN=200 GeV.The evolution of tilted energy density,pres-sure gradient,and radi... Using a(3+1)-D hydrodynamic model,CLVisc,we study the directed flow(vi)of light hadrons pro-duced in Au+Au,Ru+Ru,and Zr+Zr collisions at √SNN=200 GeV.The evolution of tilted energy density,pres-sure gradient,and radial flow along the x-direction is systematically investigated.The counter-clockwise tilt of the initial fireball is shown to be a vital source of directed flow for final light hadrons.A good description of directed flow is provided for light hadrons in central and mid-central Au+Au and isobar collisions at the RHIC.Our numeric-al results show a clear system size dependence for light hadron Vi across different collision systems.We further study the effect of nuclear structure on the directed flow and find that v1 for light hadrons is insensitive to nuclei with quadrupole deformation. 展开更多
关键词 heavy ion collisions quark-gluon plasma directed flow isobar Ru and Zr
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