目的理清中医药的热点和动态,展望中医药研学未来的发展方向。方法检索中国知识资源总库(CNKI)2013-2023年发表的关于中医药研学旅行的相关文献,利用Cite Space 6.2.R4版本,对发文量、关键词等进行分析挖掘。结果有311篇文献被纳入研究...目的理清中医药的热点和动态,展望中医药研学未来的发展方向。方法检索中国知识资源总库(CNKI)2013-2023年发表的关于中医药研学旅行的相关文献,利用Cite Space 6.2.R4版本,对发文量、关键词等进行分析挖掘。结果有311篇文献被纳入研究,25所研究机构被纳入,包括北京中医药大学等。278个关键词被纳入,热点关键词为“中医药”“研学旅行”等,并出现关键词聚类。结论通过Cite Space的引导,中医药研学旅行领域有望取得更为广阔的发展空间。展开更多
文章基于中国知网(CNKI)和Web of Science数据库,对1992—2024年发表的2800篇民族学相关论文进行计量分析,研究结果显示:从发文量趋势来看,国外1998年后发文量逐步增加,2020年达到高峰。国内2006年后发文量稳步增长,2010年达到高峰,反...文章基于中国知网(CNKI)和Web of Science数据库,对1992—2024年发表的2800篇民族学相关论文进行计量分析,研究结果显示:从发文量趋势来看,国外1998年后发文量逐步增加,2020年达到高峰。国内2006年后发文量稳步增长,2010年达到高峰,反映出全球与中国民族学发展的不同节奏。从研究热点来看,国外的研究关键词涉及文化遗产、社会经济因素等。国内的关键词集中在民族学与人类学的学科建设、中华民族共同体意识培养、少数民族文化传承与保护等方面。从机构合作来看,国外的民族学研究表现出强烈的国际合作特性。国内的研究机构合作主要集中在高校和研究院所等国内机构。从学者合作情况看,国外的学者合作呈现多元化趋势,合作网络分散且国际化。国内由少数核心学者主导,学术引领作用强,合作网络集中且权威化。展开更多
The boundness and compactness of products of multiplication,composition and differentiation on weighted Bergman spaces in the unit ball are studied.We define the differentiation operator on the space of holomorphic fu...The boundness and compactness of products of multiplication,composition and differentiation on weighted Bergman spaces in the unit ball are studied.We define the differentiation operator on the space of holomorphic functions in the unit ball by radial derivative.Then we extend the Sharma's results.展开更多
Integrating autonomous vehicles (AVs) and autonomous parking spaces (APS) marks a transformative development in urban mobility and sustainability. This paper reflects on these technologies’ historical evolution, curr...Integrating autonomous vehicles (AVs) and autonomous parking spaces (APS) marks a transformative development in urban mobility and sustainability. This paper reflects on these technologies’ historical evolution, current interdependence, and future potential through the lens of environmental, social, and economic sustainability. Historically, parking systems evolved from manual designs to automated processes yet remained focused on convenience rather than sustainability. Presently, advancements in smart infrastructure and vehicle-to-infrastructure (V2I) communication have enabled AVs and APS to operate as a cohesive system, optimizing space, energy, and transportation efficiency. Looking ahead, the seamless integration of AVs and APS into broader smart city ecosystems promises to redefine urban landscapes by repurposing traditional parking infrastructure into multifunctional spaces and supporting renewable energy initiatives. These technologies align with global sustainability goals by mitigating emissions, reducing urban sprawl, and fostering adaptive land uses. This reflection highlights the need for collaborative efforts among stakeholders to address regulatory and technological challenges, ensuring the equitable and efficient deployment of AVs and APS for smarter, greener cities.展开更多
In this study,CiteSpace software is used to carry out visual analysis on the three-dimensional research literature on urban recreation space from the perspective of compact city theory in the past 20 years,exploring t...In this study,CiteSpace software is used to carry out visual analysis on the three-dimensional research literature on urban recreation space from the perspective of compact city theory in the past 20 years,exploring the scientific development trend and research hotspots in this field.The results show that the number of published documents shows a fluctuating upward trend,and the significant growth rate reflects the role of policy orientation in promoting the concept of compact city.The co-occurrence analysis of keywords reveals the research hotspots of“compact city”,“recreation space”and“urban park”,while the emergence of new keywords such as“vertical city”and“spatial justice”indicates the new trend of recent research.The cluster analysis and timeline map further show the evolution of research themes,with“compact city”being the largest cluster and having rich connections with other themes such as“urban design”and“urban park”.展开更多
This paper presents an advanced control strategy for DC-DC buck converters utilizing Non-Minimal State Space (NMSS) representation combined with Proportional-Integral-Plus (PIP) control, optimized through Linear Quadr...This paper presents an advanced control strategy for DC-DC buck converters utilizing Non-Minimal State Space (NMSS) representation combined with Proportional-Integral-Plus (PIP) control, optimized through Linear Quadratic Regulator (LQR) design. The proposed approach leverages NMSS to eliminate the need for state observers, enhancing robustness against model mismatch and improving overall system performance. The PIP controller extends traditional PI control by incorporating additional dynamic feedback. Experimental results demonstrate that the NMSS-PIP-LQR controlled buck converter achieves excellent dynamic performance. The design procedure is fully documented, and microcontroller implementation issues are discussed.展开更多
Redundant space manipulators(RSM)exhibit high flexibility and can assist astronauts in completing various onorbit service(OOS)tasks,which have been applied to the International Space Station(ISS)and China Space Statio...Redundant space manipulators(RSM)exhibit high flexibility and can assist astronauts in completing various onorbit service(OOS)tasks,which have been applied to the International Space Station(ISS)and China Space Station(CSS).Motion planning stands as a fundamental technology within RSM,guiding the manipulator to reach designated positions smoothly and execute operational tasks with optimal performance.Nevertheless,the intricate nature of the space environment presents challenges to the motion planning of RSM.In this paper,in response to issues such as maintenance difficulties after RSM failures,base floating caused by weightlessness,flexible deformation of structures due to large-scale operations,and multiple obstacles with uncertainty,fault-tolerant motion planning,motion planning considering base floating,motion planning under structural flexibility deformation,and obstacle avoidance motion planning are examined.At present,the increasingly complex OOS tasks have brought new challenges to the motion planning of RSM.These challenges encompass motion planning for new mechanism configurations,dynamic motion planning,multi-RSM and multi-task planning,the improvement of motion planning efficiency,and the efficient implementation and precise process monitoring of motion.With the advancement of motion planning technology,RSM is poised to play an increasingly significant role in ISS and CSS.展开更多
Background:The first web space not only plays an integral role in hand functionality,but also holds an important aesthetic function for patients with cicatricial contractures,which hinders the ability to move joints,t...Background:The first web space not only plays an integral role in hand functionality,but also holds an important aesthetic function for patients with cicatricial contractures,which hinders the ability to move joints,thereby restricting the performance of everyday activities.Therefore,a wide variety of reconstruction options are available.In this study,our main aim was to have a clear surgical plan prior to surgery according to preoperative findings and the degree of thumb abduction span.Methods:This study was conducted at Kasr Al-Ainy Hospital.This cohort study included 33 patients with cicatricial first web space contractures who underwent reconstructive procedures to restore the first web space.Patients were assessed preoperatively and categorized according to the degree of contracture,and the reconstruction procedure was chosen accordingly.They were assessed using both objective and subjective methods.Results:In this study,33 cases of cicatricial contracture of the first web space due to physical or thermal trauma were included.Measurements of the change in the span of abduction were performed for all patients included in the study preoperatively and postoperatively.Skin grafting and skin substitutes had an average change in abduction span of 32.5°(±14.4°),Z-plasty release had a mean of 30.59°(±8.82°)increase in abduction span,regional flaps had an increase of 40.71°(±12.39°),while distant flaps had an increase of 35°(±3.54°).Conclusion:No single reconstruction method can be used in all cases.When viewing a patient,one must consider that each individual has a unique representation.However,if we follow a systematic method for the initial evaluation,the most efficient flap can be chosen for each case,thus reducing the need for secondary procedures.Categorizing the cases according to the abduction span into mild,moderate,or severe forms is the first building block of this algorithm.Adjacent tissue condition,patient occupation,compliance,and the need to return to work are important factors.展开更多
文摘目的理清中医药的热点和动态,展望中医药研学未来的发展方向。方法检索中国知识资源总库(CNKI)2013-2023年发表的关于中医药研学旅行的相关文献,利用Cite Space 6.2.R4版本,对发文量、关键词等进行分析挖掘。结果有311篇文献被纳入研究,25所研究机构被纳入,包括北京中医药大学等。278个关键词被纳入,热点关键词为“中医药”“研学旅行”等,并出现关键词聚类。结论通过Cite Space的引导,中医药研学旅行领域有望取得更为广阔的发展空间。
文摘文章基于中国知网(CNKI)和Web of Science数据库,对1992—2024年发表的2800篇民族学相关论文进行计量分析,研究结果显示:从发文量趋势来看,国外1998年后发文量逐步增加,2020年达到高峰。国内2006年后发文量稳步增长,2010年达到高峰,反映出全球与中国民族学发展的不同节奏。从研究热点来看,国外的研究关键词涉及文化遗产、社会经济因素等。国内的关键词集中在民族学与人类学的学科建设、中华民族共同体意识培养、少数民族文化传承与保护等方面。从机构合作来看,国外的民族学研究表现出强烈的国际合作特性。国内的研究机构合作主要集中在高校和研究院所等国内机构。从学者合作情况看,国外的学者合作呈现多元化趋势,合作网络分散且国际化。国内由少数核心学者主导,学术引领作用强,合作网络集中且权威化。
基金Supported by Natural Science Foundation of Guangdong Province in China(2018KTSCX161)。
文摘The boundness and compactness of products of multiplication,composition and differentiation on weighted Bergman spaces in the unit ball are studied.We define the differentiation operator on the space of holomorphic functions in the unit ball by radial derivative.Then we extend the Sharma's results.
文摘Integrating autonomous vehicles (AVs) and autonomous parking spaces (APS) marks a transformative development in urban mobility and sustainability. This paper reflects on these technologies’ historical evolution, current interdependence, and future potential through the lens of environmental, social, and economic sustainability. Historically, parking systems evolved from manual designs to automated processes yet remained focused on convenience rather than sustainability. Presently, advancements in smart infrastructure and vehicle-to-infrastructure (V2I) communication have enabled AVs and APS to operate as a cohesive system, optimizing space, energy, and transportation efficiency. Looking ahead, the seamless integration of AVs and APS into broader smart city ecosystems promises to redefine urban landscapes by repurposing traditional parking infrastructure into multifunctional spaces and supporting renewable energy initiatives. These technologies align with global sustainability goals by mitigating emissions, reducing urban sprawl, and fostering adaptive land uses. This reflection highlights the need for collaborative efforts among stakeholders to address regulatory and technological challenges, ensuring the equitable and efficient deployment of AVs and APS for smarter, greener cities.
基金Sponsored by the Project of Sichuan Landscape and Recreation Research Center(JGYQ2020037).
文摘In this study,CiteSpace software is used to carry out visual analysis on the three-dimensional research literature on urban recreation space from the perspective of compact city theory in the past 20 years,exploring the scientific development trend and research hotspots in this field.The results show that the number of published documents shows a fluctuating upward trend,and the significant growth rate reflects the role of policy orientation in promoting the concept of compact city.The co-occurrence analysis of keywords reveals the research hotspots of“compact city”,“recreation space”and“urban park”,while the emergence of new keywords such as“vertical city”and“spatial justice”indicates the new trend of recent research.The cluster analysis and timeline map further show the evolution of research themes,with“compact city”being the largest cluster and having rich connections with other themes such as“urban design”and“urban park”.
文摘This paper presents an advanced control strategy for DC-DC buck converters utilizing Non-Minimal State Space (NMSS) representation combined with Proportional-Integral-Plus (PIP) control, optimized through Linear Quadratic Regulator (LQR) design. The proposed approach leverages NMSS to eliminate the need for state observers, enhancing robustness against model mismatch and improving overall system performance. The PIP controller extends traditional PI control by incorporating additional dynamic feedback. Experimental results demonstrate that the NMSS-PIP-LQR controlled buck converter achieves excellent dynamic performance. The design procedure is fully documented, and microcontroller implementation issues are discussed.
基金supported by the Beijing Natural Science Foundation for Distinguished Young Scholars(Grant No.JQ22007)National Natural Science Foundation of China(Grant No.52275001)the Project of Cultivation for Young Top-motch Talents of Beijing Municipal Institutions(Grant No.BPHR202203004)。
文摘Redundant space manipulators(RSM)exhibit high flexibility and can assist astronauts in completing various onorbit service(OOS)tasks,which have been applied to the International Space Station(ISS)and China Space Station(CSS).Motion planning stands as a fundamental technology within RSM,guiding the manipulator to reach designated positions smoothly and execute operational tasks with optimal performance.Nevertheless,the intricate nature of the space environment presents challenges to the motion planning of RSM.In this paper,in response to issues such as maintenance difficulties after RSM failures,base floating caused by weightlessness,flexible deformation of structures due to large-scale operations,and multiple obstacles with uncertainty,fault-tolerant motion planning,motion planning considering base floating,motion planning under structural flexibility deformation,and obstacle avoidance motion planning are examined.At present,the increasingly complex OOS tasks have brought new challenges to the motion planning of RSM.These challenges encompass motion planning for new mechanism configurations,dynamic motion planning,multi-RSM and multi-task planning,the improvement of motion planning efficiency,and the efficient implementation and precise process monitoring of motion.With the advancement of motion planning technology,RSM is poised to play an increasingly significant role in ISS and CSS.
文摘Background:The first web space not only plays an integral role in hand functionality,but also holds an important aesthetic function for patients with cicatricial contractures,which hinders the ability to move joints,thereby restricting the performance of everyday activities.Therefore,a wide variety of reconstruction options are available.In this study,our main aim was to have a clear surgical plan prior to surgery according to preoperative findings and the degree of thumb abduction span.Methods:This study was conducted at Kasr Al-Ainy Hospital.This cohort study included 33 patients with cicatricial first web space contractures who underwent reconstructive procedures to restore the first web space.Patients were assessed preoperatively and categorized according to the degree of contracture,and the reconstruction procedure was chosen accordingly.They were assessed using both objective and subjective methods.Results:In this study,33 cases of cicatricial contracture of the first web space due to physical or thermal trauma were included.Measurements of the change in the span of abduction were performed for all patients included in the study preoperatively and postoperatively.Skin grafting and skin substitutes had an average change in abduction span of 32.5°(±14.4°),Z-plasty release had a mean of 30.59°(±8.82°)increase in abduction span,regional flaps had an increase of 40.71°(±12.39°),while distant flaps had an increase of 35°(±3.54°).Conclusion:No single reconstruction method can be used in all cases.When viewing a patient,one must consider that each individual has a unique representation.However,if we follow a systematic method for the initial evaluation,the most efficient flap can be chosen for each case,thus reducing the need for secondary procedures.Categorizing the cases according to the abduction span into mild,moderate,or severe forms is the first building block of this algorithm.Adjacent tissue condition,patient occupation,compliance,and the need to return to work are important factors.
