Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a ...Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a modified radio ephemeris updated by tool tempo2, we analyze the ~15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of ~4σ with a weighted H-test value of ~26. By performing a phase-resolved analysis, the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is L_(γ)~ 3.8 × 10^(33) erg s^(-1) using NGC 6397's distance of 2.48 kpc. And γ-rays from the on-pulse part of PSR J1740-5340B contribute ~90% of the total observed γ-ray emissions from NGC 6397. No significant γ-ray pulsation of another MSP J1740-5340A in the GC is detected.Considering that the previous four cases of MSPs in GCs, more data in γ-ray, X-ray, and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B, especially starving for a precise ephemeris.展开更多
随着药品研发及临床试验成本的不断增加,如何充分利用各类数据指引临床试验高效地开展,以提高新药的研发效率,并制定科学合理的用药方案,具有重要意义。基于模型的荟萃分析(model based meta-analysis,MBMA)是将数学建模与荟萃分析(meta...随着药品研发及临床试验成本的不断增加,如何充分利用各类数据指引临床试验高效地开展,以提高新药的研发效率,并制定科学合理的用药方案,具有重要意义。基于模型的荟萃分析(model based meta-analysis,MBMA)是将数学建模与荟萃分析(meta-analysis)相结合,对多种来源(如临床前和临床各阶段研究数据等)和多个维度(靶标/机制、药代/药效动力学、疾病/适应症、人群特征、给药方案、生物标志物/药效指标/安全性指标等)的信息进行整合,不仅为药物研发各个关键环节的决策制定提供重要依据,也可为临床合理用药以及药物经济学中的成本-效益分析提供有效信息。传统的Meta分析对数据的同质性要求较高,而MBMA通过建模可将不同剂量、不同疗程和不同人群的异质性数据合并分析,从而对药物的剂量效应、时间效应和影响因素进行量化,预测以往研究中不曾涉及的剂量、时间和协变量水平下的药效或安全特征。尽管MBMA的建模和模拟技术与群体药动学/药效学(population pharmacokinetics/pharmacodynamics,Pop PK/PD)相似,但相比Pop PK/PD,MBMA最大的优势是可对文献数据进行充分利用,不仅提高了结论的证据强度,更可回答单个研究不能回答的问题。目前MBMA已成为模型引导的药物研发(model-informed drug development,MIDD)策略中的重要方法之一。本文将就MBMA的应用价值、分析计划、数据采集与处理、分析方法以及报告要点进行说明,旨在为MBMA在新药研发和临床实践中的应用提供参考。展开更多
以TiO2 P25纳米颗粒为原料,通过碱-水热法制备TiO2纳米带,再采用水热法成功制备出Bi2WO6/TiO2纳米带材料.利用X射线衍射仪(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)以及透射电子显微镜(transmission ...以TiO2 P25纳米颗粒为原料,通过碱-水热法制备TiO2纳米带,再采用水热法成功制备出Bi2WO6/TiO2纳米带材料.利用X射线衍射仪(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)以及透射电子显微镜(transmission electron microscope,TEM)分别对该材料的物相和形貌进行了分析,并研究了其在可见光下的光催化的性能和催化机理.研究结果表明:制备出的Bi2WO6纳米带通过分子间作用力成功负载在TiO2纳米带上.制备出的Bi2WO6/TiO2在可见光下具有优越的光催化性能,这归因于材料较好的光生电子-空穴分离效率以及材料特定的物理性质,不仅为光催化反应提供了丰富的活性位点,还有效促进了电子的轴向迁移率.展开更多
This work mainly focuses on the mineralogical study of particulate matter（PM10） in Beijing. Samples were collected on polycarbonate filter from April, 2002 to March, 2003 in Beijing urban area. Scanning electronic m...This work mainly focuses on the mineralogical study of particulate matter（PM10） in Beijing. Samples were collected on polycarbonate filter from April, 2002 to March, 2003 in Beijing urban area. Scanning electronic microscopy coupled with energy dispersive X-ray（SEM/EDX） was used to investigate individual mineral particles in Beijing PM10. 1454 individual mineral particulates from 48 samples were analysed by SEM/EDX. The results revealed that mineral particulates were complex and heterogeneous. 38 kinds of minerals in PM10 were identified. The clay minerals, of annual average percentage of 30.1%, were the main composition among the identified minerals, and illite/smectite was the main composition in clay minerals, reaching up to 35%. Annual average percentage of quartz, calcite, compound particulates, carbonates were 13.5%, 10.9%, 11.95%, 10.31%, respectively. Annual average percentage less than 10% were gypsum, feldspar, dolomite, and so on. Fluorite, apatite, halite, barite and chloridize zinc（ZnCl2） were firstly identified in Beijing PM10. Sulfurization was found on surface of mineral particles, suggested extensive atmospheric reaction in air during summer.展开更多
基金supported in part by the National Natural Science Foundation of China Nos. 12163006 and 12233006the Basic Research Program of Yunnan Province No. 202201AT070137+1 种基金the joint foundation of Department of Science and Technology of Yunnan Province and Yunnan University No. 202201BF070001-020support by the Xingdian Talent Support Plan-Youth Project。
文摘Recently, a new radio millisecond pulsar(MSP) J1740-5340B, hosted in the globular cluster(GC) NGC 6397,was reported with a 5.78 ms spin period in an eclipsing binary system with a 1.97 days orbital period. Based on a modified radio ephemeris updated by tool tempo2, we analyze the ~15 yr γ-ray data obtained from the Large Area Telescope on board the Fermi Gamma-ray Space Telescope and detect PSR J1740-5340B's γ-ray pulsation at a confidence level of ~4σ with a weighted H-test value of ~26. By performing a phase-resolved analysis, the γ-ray luminosity in on-pulse interval of PSR J1740-5340B is L_(γ)~ 3.8 × 10^(33) erg s^(-1) using NGC 6397's distance of 2.48 kpc. And γ-rays from the on-pulse part of PSR J1740-5340B contribute ~90% of the total observed γ-ray emissions from NGC 6397. No significant γ-ray pulsation of another MSP J1740-5340A in the GC is detected.Considering that the previous four cases of MSPs in GCs, more data in γ-ray, X-ray, and radio are encouraged to finally confirm the γ-ray emissions from MSP J1740-5340B, especially starving for a precise ephemeris.
文摘随着药品研发及临床试验成本的不断增加,如何充分利用各类数据指引临床试验高效地开展,以提高新药的研发效率,并制定科学合理的用药方案,具有重要意义。基于模型的荟萃分析(model based meta-analysis,MBMA)是将数学建模与荟萃分析(meta-analysis)相结合,对多种来源(如临床前和临床各阶段研究数据等)和多个维度(靶标/机制、药代/药效动力学、疾病/适应症、人群特征、给药方案、生物标志物/药效指标/安全性指标等)的信息进行整合,不仅为药物研发各个关键环节的决策制定提供重要依据,也可为临床合理用药以及药物经济学中的成本-效益分析提供有效信息。传统的Meta分析对数据的同质性要求较高,而MBMA通过建模可将不同剂量、不同疗程和不同人群的异质性数据合并分析,从而对药物的剂量效应、时间效应和影响因素进行量化,预测以往研究中不曾涉及的剂量、时间和协变量水平下的药效或安全特征。尽管MBMA的建模和模拟技术与群体药动学/药效学(population pharmacokinetics/pharmacodynamics,Pop PK/PD)相似,但相比Pop PK/PD,MBMA最大的优势是可对文献数据进行充分利用,不仅提高了结论的证据强度,更可回答单个研究不能回答的问题。目前MBMA已成为模型引导的药物研发(model-informed drug development,MIDD)策略中的重要方法之一。本文将就MBMA的应用价值、分析计划、数据采集与处理、分析方法以及报告要点进行说明,旨在为MBMA在新药研发和临床实践中的应用提供参考。
文摘以TiO2 P25纳米颗粒为原料,通过碱-水热法制备TiO2纳米带,再采用水热法成功制备出Bi2WO6/TiO2纳米带材料.利用X射线衍射仪(X-ray diffraction,XRD)、扫描电子显微镜(scanning electron microscope,SEM)以及透射电子显微镜(transmission electron microscope,TEM)分别对该材料的物相和形貌进行了分析,并研究了其在可见光下的光催化的性能和催化机理.研究结果表明:制备出的Bi2WO6纳米带通过分子间作用力成功负载在TiO2纳米带上.制备出的Bi2WO6/TiO2在可见光下具有优越的光催化性能,这归因于材料较好的光生电子-空穴分离效率以及材料特定的物理性质,不仅为光催化反应提供了丰富的活性位点,还有效促进了电子的轴向迁移率.
基金The National Natural Science Foundation of China（No.40275040） and the Shanghai Leading Academic Disciplines（No. T0105）
文摘This work mainly focuses on the mineralogical study of particulate matter（PM10） in Beijing. Samples were collected on polycarbonate filter from April, 2002 to March, 2003 in Beijing urban area. Scanning electronic microscopy coupled with energy dispersive X-ray（SEM/EDX） was used to investigate individual mineral particles in Beijing PM10. 1454 individual mineral particulates from 48 samples were analysed by SEM/EDX. The results revealed that mineral particulates were complex and heterogeneous. 38 kinds of minerals in PM10 were identified. The clay minerals, of annual average percentage of 30.1%, were the main composition among the identified minerals, and illite/smectite was the main composition in clay minerals, reaching up to 35%. Annual average percentage of quartz, calcite, compound particulates, carbonates were 13.5%, 10.9%, 11.95%, 10.31%, respectively. Annual average percentage less than 10% were gypsum, feldspar, dolomite, and so on. Fluorite, apatite, halite, barite and chloridize zinc（ZnCl2） were firstly identified in Beijing PM10. Sulfurization was found on surface of mineral particles, suggested extensive atmospheric reaction in air during summer.
