It＇s not every day you happen to see a dead wolf, an elephant and a horse just lying around. But then this is no ordinary location. The animals are just some of the weird and wonderful props used at a special effects...It＇s not every day you happen to see a dead wolf, an elephant and a horse just lying around. But then this is no ordinary location. The animals are just some of the weird and wonderful props used at a special effects makeup studio located in the Dachang Movie Town, Dachang Hui Autonomous County in Langfang City. north of China＇s Hebei Province.展开更多
The third International Standardization Youth Star Competition is held in Qingdao.We are very pleased to see that 236 teams from renowned domestic universities are actively participating in the competition.ISO has als...The third International Standardization Youth Star Competition is held in Qingdao.We are very pleased to see that 236 teams from renowned domestic universities are actively participating in the competition.ISO has also sent a representative to Qingdao,demonstrating its high level of attention and support for the competition.展开更多
To help university students know more about standards,and attract them to par ticipate in s tandardization ac tivities,the International Standardization Youth Star Competition was initiated by the International Standa...To help university students know more about standards,and attract them to par ticipate in s tandardization ac tivities,the International Standardization Youth Star Competition was initiated by the International Standardization Outstanding Contribution Award Foundation(ISOCAF)in 2023,and has been held since then for three consecutive years in China.The 2025 Competition attracted 236 teams nationwide who demonstrated great enthusiasm for engaging in the standardization undertaking.The SPECIAL REPORT column presents the series reports on the competition,which is expected to inspire more young minds to step forward,innovate with purpose,and shape a future where standards unite ambition with impact.展开更多
The final and award ceremony of the International Standardization Youth Star Competition 2025 were held in Qingdao on November 22-23.The competition attracted 236 teams nationwide who demonstrated great enthusiasm for...The final and award ceremony of the International Standardization Youth Star Competition 2025 were held in Qingdao on November 22-23.The competition attracted 236 teams nationwide who demonstrated great enthusiasm for participating in the standardization undertaking.The competition followed the mode of“the industry puts forward questions,and the academia provides solutions”.Shandong Port Group Co.,Ltd.,Contemporary Amperex Technology Co.,Ltd.(CATL),Huawei Technologies Co.,Ltd.,and Beijing Zhongbiaolvjian Engineering Design and Research Institute Co.,Ltd.set up themed tracks respectively,and competitors developed standard proposals for the corresponding themes.展开更多
China Standardization:What is your view on this year's International Standardization Youth Star Competition?Tom Heilandt:This is the first time I have attended this event,which was founded by my good friend Dr.Zha...China Standardization:What is your view on this year's International Standardization Youth Star Competition?Tom Heilandt:This is the first time I have attended this event,which was founded by my good friend Dr.Zhang Xiaogang,whom I first met in 2016 when he was President of ISO.It is an excellent initiative.I strongly believe that it is essential for young people to become involved in standardization.展开更多
We identify an S-shaped main-jet axis in the Vela core-collapse supernova remnant(CCSNR)that we attribute to a pair of precessing jets,one of the tens of pairs of jets that exploded the progenitor of Vela according to...We identify an S-shaped main-jet axis in the Vela core-collapse supernova remnant(CCSNR)that we attribute to a pair of precessing jets,one of the tens of pairs of jets that exploded the progenitor of Vela according to the jittering jets explosion mechanism(JJEM).A main-jet axis is a symmetry axis across the CCSNR and through the center.We identify the S-shaped main-jet axis by the high abundance of ejecta elements,oxygen,neon,and magnesium.We bring the number of identified pairs of clumps and ears in Vela to seven,two pairs shaped by the pair of precessing jets that formed the main-jet axis.The pairs and the main-jet axis form the point-symmetric wind-rose structure of Vela.The other five pairs of clumps/ears do not have signatures near the center,only on two opposite sides of the CCSNR.We discuss different possible jet-less shaping mechanisms to form such a point-symmetric morphology and dismiss these processes because they cannot explain the point-symmetric morphology of Vela,the S-shaped high ejecta abundance pattern,and the enormous energy required to shape the S-shaped structure.Our findings strongly support the JJEM and further severely challenge the neutrino-driven explosion mechanism.展开更多
This paper outlines the scientific goals and observational strategies of the Mini-SiTian Array.Mounted at Xinglong Observatory,the Mini-SiTian Array consists of three 30 cm telescopes and has been in operation since 2...This paper outlines the scientific goals and observational strategies of the Mini-SiTian Array.Mounted at Xinglong Observatory,the Mini-SiTian Array consists of three 30 cm telescopes and has been in operation since 2022.The large field of view,combined with the capability for multi-band photometric observations,enables the Mini-SiTian Array to perform rapid follow-up observations to identify optical counterparts of gravitational waves,capture the early light curves of tidal disruption events and supernovae,and monitor stellar flares,Be star outbursts,and cataclysmic variable stars,although its limiting magnitude is not very deep.By collaborating with the Xinglong2.16 m telescope and leveraging a real-time image processing pipeline,simultaneous photometric and spectroscopic observations could be performed to reveal their underlying physical mechanisms.The observational and research experience provides critical guidance for the implementation of the full-scale SiTian project in the future.展开更多
With the advancement of astronomical observation technology,people have a deeper understanding of the formation and evolution of galaxies,but many details of our own Milky Way and other external galaxies are still unk...With the advancement of astronomical observation technology,people have a deeper understanding of the formation and evolution of galaxies,but many details of our own Milky Way and other external galaxies are still unknown.Therefore,by studying the formation and orbital transformation mechanism of satellites,planets and stars,the author puts forward a new theory on the formation and evolution of stars and galaxies,thus revealing the hierarchical structure of galaxies and the formation and evolution laws of main sequence stars,red giants,white dwarfs,black dwarfs,supernovae,neutron stars,black holes and quasars.Some special phenomena in the course of star formation and evolution,such as sunspots,flares,fast radio bursts and gamma-ray bursts,have also been revealed.展开更多
目的运用科学性、透明性和适用性评级(scientific,transparent and applicable rankings,STAR)工具评价2020—2025年国内急危重症领域营养相关临床指南及共识的方法学质量,系统分析其关键推荐内容的异同,为指南及共识的临床应用、更新...目的运用科学性、透明性和适用性评级(scientific,transparent and applicable rankings,STAR)工具评价2020—2025年国内急危重症领域营养相关临床指南及共识的方法学质量,系统分析其关键推荐内容的异同,为指南及共识的临床应用、更新与整合提供依据。方法系统检索中国知网、万方、中国生物医学文献数据库、中华医学期刊文献数据库、中华医学会肠外肠内营养学分会(CSPEN)、中华医学会重症医学分会(CCCM)、PubMed、WebofScience(WOS)等数据库,检索时限从2020年1月1日—2025年8月31日。由2名研究者独立筛选文献,采用STAR工具进行质量评价,并预先设计信息提取表,对指南及共识中关于营养风险筛查、启动时机、能量目标、耐受性监测、并发症管理等关键推荐内容进行提取与比较分析。结果共纳入2篇指南、12篇专家共识。14篇文献方法学质量得分为(48.74±17.63)分。关键内容分析发现:各指南及共识在营养风险筛查工具的选择、肠内营养启动时机的推荐强度、能量目标设定(基于间接测热法或公式法的精确性要求等方面)共识度较高;但在胃残余量的监测时机与频次存在争议,促胃肠动力药的使用时机、腹泻的处理流程等方面存在差异。结论国内急危重症肠内营养指南及共识整体质量不高,透明度有待提升;其关键推荐内容在核心环节已形成基本共识,但在具体监测指标和药物干预等操作细节上存在差异。临床医务人员进行决策时,应结合指南及共识质量、证据等级及患者具体情况。未来需进一步结合临床实践,探索现有推荐意见与临床之间差距,并推进高质量指南及共识的制订,形成更具操作性的规范流程。展开更多
For k given graphs H_(1),...,H_(k) with k≥2,the k-color Ramsey number R(H_(1),...,H_(k)) represents the minimum integer N with the following property:if the edges of the complete graph K_(N) are colored with k colors...For k given graphs H_(1),...,H_(k) with k≥2,the k-color Ramsey number R(H_(1),...,H_(k)) represents the minimum integer N with the following property:if the edges of the complete graph K_(N) are colored with k colors,then there exists some i with 1≤i≤k such that K_(N) has a subgraph in color i isomorphic to H_(i).Let C_(m) be a cycle of length m and K_(1,n) a star of order n+1.In this paper,we systematically introduce the latest research progress on star-quadrilateral Ramsey numbers and provide an overview of Ramsey numbers concerning quadrilaterals,including multicolor cases.展开更多
文摘It＇s not every day you happen to see a dead wolf, an elephant and a horse just lying around. But then this is no ordinary location. The animals are just some of the weird and wonderful props used at a special effects makeup studio located in the Dachang Movie Town, Dachang Hui Autonomous County in Langfang City. north of China＇s Hebei Province.
文摘The third International Standardization Youth Star Competition is held in Qingdao.We are very pleased to see that 236 teams from renowned domestic universities are actively participating in the competition.ISO has also sent a representative to Qingdao,demonstrating its high level of attention and support for the competition.
文摘To help university students know more about standards,and attract them to par ticipate in s tandardization ac tivities,the International Standardization Youth Star Competition was initiated by the International Standardization Outstanding Contribution Award Foundation(ISOCAF)in 2023,and has been held since then for three consecutive years in China.The 2025 Competition attracted 236 teams nationwide who demonstrated great enthusiasm for engaging in the standardization undertaking.The SPECIAL REPORT column presents the series reports on the competition,which is expected to inspire more young minds to step forward,innovate with purpose,and shape a future where standards unite ambition with impact.
文摘The final and award ceremony of the International Standardization Youth Star Competition 2025 were held in Qingdao on November 22-23.The competition attracted 236 teams nationwide who demonstrated great enthusiasm for participating in the standardization undertaking.The competition followed the mode of“the industry puts forward questions,and the academia provides solutions”.Shandong Port Group Co.,Ltd.,Contemporary Amperex Technology Co.,Ltd.(CATL),Huawei Technologies Co.,Ltd.,and Beijing Zhongbiaolvjian Engineering Design and Research Institute Co.,Ltd.set up themed tracks respectively,and competitors developed standard proposals for the corresponding themes.
文摘China Standardization:What is your view on this year's International Standardization Youth Star Competition?Tom Heilandt:This is the first time I have attended this event,which was founded by my good friend Dr.Zhang Xiaogang,whom I first met in 2016 when he was President of ISO.It is an excellent initiative.I strongly believe that it is essential for young people to become involved in standardization.
基金A grant from the Pazy Foundation supported this research
文摘We identify an S-shaped main-jet axis in the Vela core-collapse supernova remnant(CCSNR)that we attribute to a pair of precessing jets,one of the tens of pairs of jets that exploded the progenitor of Vela according to the jittering jets explosion mechanism(JJEM).A main-jet axis is a symmetry axis across the CCSNR and through the center.We identify the S-shaped main-jet axis by the high abundance of ejecta elements,oxygen,neon,and magnesium.We bring the number of identified pairs of clumps and ears in Vela to seven,two pairs shaped by the pair of precessing jets that formed the main-jet axis.The pairs and the main-jet axis form the point-symmetric wind-rose structure of Vela.The other five pairs of clumps/ears do not have signatures near the center,only on two opposite sides of the CCSNR.We discuss different possible jet-less shaping mechanisms to form such a point-symmetric morphology and dismiss these processes because they cannot explain the point-symmetric morphology of Vela,the S-shaped high ejecta abundance pattern,and the enormous energy required to shape the S-shaped structure.Our findings strongly support the JJEM and further severely challenge the neutrino-driven explosion mechanism.
基金supported by the National Key Basic R&D Program of China via 2023YFA1608303the Strategic Priority Research Program of the Chinese Academy of Sciences(XDB0550103)+3 种基金the Strategic Priority Research Program of Chinese Academy of Sciences(grant Nos.XDB0550000,XDB0550100 and XDB0550102)supported from the Strategic Pioneer Program of the Astronomy Large-Scale Scientific Facility,Chinese Academy of Sciences and the Science and Education Integration Funding of University of Chinese Academy of Sciencessupported by the National Natural Science Foundation of China(NSFCgrant Nos.12090040,12090041,12090041,12422303,12261141690,and 12403022)。
文摘This paper outlines the scientific goals and observational strategies of the Mini-SiTian Array.Mounted at Xinglong Observatory,the Mini-SiTian Array consists of three 30 cm telescopes and has been in operation since 2022.The large field of view,combined with the capability for multi-band photometric observations,enables the Mini-SiTian Array to perform rapid follow-up observations to identify optical counterparts of gravitational waves,capture the early light curves of tidal disruption events and supernovae,and monitor stellar flares,Be star outbursts,and cataclysmic variable stars,although its limiting magnitude is not very deep.By collaborating with the Xinglong2.16 m telescope and leveraging a real-time image processing pipeline,simultaneous photometric and spectroscopic observations could be performed to reveal their underlying physical mechanisms.The observational and research experience provides critical guidance for the implementation of the full-scale SiTian project in the future.
文摘With the advancement of astronomical observation technology,people have a deeper understanding of the formation and evolution of galaxies,but many details of our own Milky Way and other external galaxies are still unknown.Therefore,by studying the formation and orbital transformation mechanism of satellites,planets and stars,the author puts forward a new theory on the formation and evolution of stars and galaxies,thus revealing the hierarchical structure of galaxies and the formation and evolution laws of main sequence stars,red giants,white dwarfs,black dwarfs,supernovae,neutron stars,black holes and quasars.Some special phenomena in the course of star formation and evolution,such as sunspots,flares,fast radio bursts and gamma-ray bursts,have also been revealed.
文摘针对美国空管部门的机场终端区空管自动化系统(Standard Terminal Automation Replacement System,STARS)中降水资料的诸多不足,按照新一代航空运输系统要求,美国联邦航空管理局(FAA)正组织研究“新一代机场终端区降水显示产品”(Terminal Precipitation on the Glass,TPoG)。TPoG项目利用源自美国新一代天气系统(NextGen天气系统)的高精度国家天气雷达数据,显著提升空管自动化系统中降水信息的精度和可靠性,进而提升空管指挥与空中飞行的安全与效率。文中介绍了中国民航与TPoG相类似的几种气象-空管融合产品在流量管理和管制指挥等方面的研究进展及业务应用情况,并探讨中国民航气象服务在气象-空管融合领域的发展方向。
文摘目的运用科学性、透明性和适用性评级(scientific,transparent and applicable rankings,STAR)工具评价2020—2025年国内急危重症领域营养相关临床指南及共识的方法学质量,系统分析其关键推荐内容的异同,为指南及共识的临床应用、更新与整合提供依据。方法系统检索中国知网、万方、中国生物医学文献数据库、中华医学期刊文献数据库、中华医学会肠外肠内营养学分会(CSPEN)、中华医学会重症医学分会(CCCM)、PubMed、WebofScience(WOS)等数据库,检索时限从2020年1月1日—2025年8月31日。由2名研究者独立筛选文献,采用STAR工具进行质量评价,并预先设计信息提取表,对指南及共识中关于营养风险筛查、启动时机、能量目标、耐受性监测、并发症管理等关键推荐内容进行提取与比较分析。结果共纳入2篇指南、12篇专家共识。14篇文献方法学质量得分为(48.74±17.63)分。关键内容分析发现:各指南及共识在营养风险筛查工具的选择、肠内营养启动时机的推荐强度、能量目标设定(基于间接测热法或公式法的精确性要求等方面)共识度较高;但在胃残余量的监测时机与频次存在争议,促胃肠动力药的使用时机、腹泻的处理流程等方面存在差异。结论国内急危重症肠内营养指南及共识整体质量不高,透明度有待提升;其关键推荐内容在核心环节已形成基本共识,但在具体监测指标和药物干预等操作细节上存在差异。临床医务人员进行决策时,应结合指南及共识质量、证据等级及患者具体情况。未来需进一步结合临床实践,探索现有推荐意见与临床之间差距,并推进高质量指南及共识的制订,形成更具操作性的规范流程。
基金supported by NSFC(Nos.12161141003,11931006)supported by NSFC(Nos.11801520,12171436,12271489)supported by NSFC(No.11601527)。
文摘For k given graphs H_(1),...,H_(k) with k≥2,the k-color Ramsey number R(H_(1),...,H_(k)) represents the minimum integer N with the following property:if the edges of the complete graph K_(N) are colored with k colors,then there exists some i with 1≤i≤k such that K_(N) has a subgraph in color i isomorphic to H_(i).Let C_(m) be a cycle of length m and K_(1,n) a star of order n+1.In this paper,we systematically introduce the latest research progress on star-quadrilateral Ramsey numbers and provide an overview of Ramsey numbers concerning quadrilaterals,including multicolor cases.
