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
背景与目的肺纤毛黏液结节性乳头状肿瘤(ciliated muconodular papillary tumor of the lung,CMPT)的发病极其少见,在临床上与其他肺部病变亦难以区别,易造成误诊、漏诊;通过收集CMPT的资料,分析其临床病理特征,可以为广大医务工作者提...背景与目的肺纤毛黏液结节性乳头状肿瘤(ciliated muconodular papillary tumor of the lung,CMPT)的发病极其少见,在临床上与其他肺部病变亦难以区别,易造成误诊、漏诊;通过收集CMPT的资料,分析其临床病理特征,可以为广大医务工作者提供诊治思路,减少医疗差错。方法回顾性分析1例典型的CMPT患者的临床资料、病理特征、免疫表型并结合相关文献进行探讨。结果患者胸部计算机断层扫描(computed tomography,CT)提示右下肺近胸膜处可见混合密度结节影,直径约9 mm,肿瘤行肺楔形切除术,镜下见结节由增生的纤毛细胞、黏液细胞及基底样细胞混合组成,以乳头状、腺样结构为主,纤毛细胞衬覆于乳头状结构表面,基底样细胞位于外层,黏液细胞则位于两者之间,各种细胞异型不明显。免疫组化:上皮细胞CEA(+)、CK7(+)、CA125(+)、TTF-1(弱+)、CK20(-)、Ki67(1%+)、CK5/6(+);基底细胞P63(+)。结论CMPT是一种新近发现的罕见的肺部肿瘤,关于其良恶性目前尚无定论,但多数学者倾向于良性,其在影像学上可表现出诸多恶性肿瘤征象而常被误认为是肺腺癌,通过其典型的病理组织学特点及免疫组化表型可与其他肺部疾病进行鉴别,基因突变是否是其驱动因素目前尚不得知,该肿瘤行手术切除预后较好。展开更多
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
食管-胃结合部腺癌(adenocarcinoma of esophagogastric junction,AEG)在全球的发病率不断升高,因其特殊的解剖位置、独特的生物学行为被越来越多的临床工作者所重视。目前国内外虽然对AEG的发病、分型等已形成了一定共识,但在更多方面...食管-胃结合部腺癌(adenocarcinoma of esophagogastric junction,AEG)在全球的发病率不断升高,因其特殊的解剖位置、独特的生物学行为被越来越多的临床工作者所重视。目前国内外虽然对AEG的发病、分型等已形成了一定共识,但在更多方面,尤其是外科治疗手段,诸如手术路径、胃的切除范围、淋巴结的清扫范围、消化道重建等方面仍存在较多争议。这些争议不仅限制了对AEG治疗的探索与发展,同时使得对AEG的规范化诊疗变得更加困难。本文结合近些年的相关文献,就目前AEG治疗的国内外相关共识与争议进行综述,以期为临床诊治提供更加合理、有效的方法。展开更多
基金Supported by the National Key R&D Program of China(2018YFA0404201,2018YFA0404202,2018YFA0404203,2018YFA0404204)the National Natural Science Foundation of China(12022502,12205314,12105301,12261160362,12105294,U1931201)+2 种基金the Youth Innovation Promotion Association CAS(2022010)in Thailand by the National Science and Technology Development Agency(NSTDA)the National Research Council of Thailand(NRCT):High-Potential Research Team Grant Program(N42A650868)。
文摘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.
文摘背景与目的肺纤毛黏液结节性乳头状肿瘤(ciliated muconodular papillary tumor of the lung,CMPT)的发病极其少见,在临床上与其他肺部病变亦难以区别,易造成误诊、漏诊;通过收集CMPT的资料,分析其临床病理特征,可以为广大医务工作者提供诊治思路,减少医疗差错。方法回顾性分析1例典型的CMPT患者的临床资料、病理特征、免疫表型并结合相关文献进行探讨。结果患者胸部计算机断层扫描(computed tomography,CT)提示右下肺近胸膜处可见混合密度结节影,直径约9 mm,肿瘤行肺楔形切除术,镜下见结节由增生的纤毛细胞、黏液细胞及基底样细胞混合组成,以乳头状、腺样结构为主,纤毛细胞衬覆于乳头状结构表面,基底样细胞位于外层,黏液细胞则位于两者之间,各种细胞异型不明显。免疫组化:上皮细胞CEA(+)、CK7(+)、CA125(+)、TTF-1(弱+)、CK20(-)、Ki67(1%+)、CK5/6(+);基底细胞P63(+)。结论CMPT是一种新近发现的罕见的肺部肿瘤,关于其良恶性目前尚无定论,但多数学者倾向于良性,其在影像学上可表现出诸多恶性肿瘤征象而常被误认为是肺腺癌,通过其典型的病理组织学特点及免疫组化表型可与其他肺部疾病进行鉴别,基因突变是否是其驱动因素目前尚不得知,该肿瘤行手术切除预后较好。
基金Supported in China by National Key R&D program of China(2018YFA0404201,2018YFA0404202,2018YFA0404203,2018YFA0404204)NSFC(U2031101,11475141,12147208)in Thailand by RTA6280002 from Thailand Science Research and Innovation。
文摘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.
文摘食管-胃结合部腺癌(adenocarcinoma of esophagogastric junction,AEG)在全球的发病率不断升高,因其特殊的解剖位置、独特的生物学行为被越来越多的临床工作者所重视。目前国内外虽然对AEG的发病、分型等已形成了一定共识,但在更多方面,尤其是外科治疗手段,诸如手术路径、胃的切除范围、淋巴结的清扫范围、消化道重建等方面仍存在较多争议。这些争议不仅限制了对AEG治疗的探索与发展,同时使得对AEG的规范化诊疗变得更加困难。本文结合近些年的相关文献,就目前AEG治疗的国内外相关共识与争议进行综述,以期为临床诊治提供更加合理、有效的方法。
