LIRR's Priject of "Research on Spalling Mechanism Due to Rapid Heating-up of Dense Refractory Castables" declared by Wang Zhanmin,vice-president of LIRR,will gain the fund support from National Natural Science Foun...LIRR's Priject of "Research on Spalling Mechanism Due to Rapid Heating-up of Dense Refractory Castables" declared by Wang Zhanmin,vice-president of LIRR,will gain the fund support from National Natural Science Foundation of China in 2011.展开更多
THE continental dynamics has become a goaI since the beginning of the 1990s and it will still bethe key subject in the 21st century. Orogenic belts, having experienced the most intensechanges of geotherm and mechanics...THE continental dynamics has become a goaI since the beginning of the 1990s and it will still bethe key subject in the 21st century. Orogenic belts, having experienced the most intensechanges of geotherm and mechanics in the lithosphere, are the important research object in thestudy of continental dynamics. For this reason, the study of orogenic belts forms a hot and dif-ficult point in the geological society and the concentration of efforts is needed for overcomingthis difficult point. China has the most orogenic belts of various types in the world, so the De-partment of Earth Sciences caught this scientific chance in the early 1990s, took the展开更多
为解决传统数字滤波器在有限精度实现时因有限字长(Finite Word Length,FWL)效应导致滤波器性能下降的问题,提出一种L_(2)灵敏度最小化的数字滤波器状态空间实现稀疏化方法.推导前向差分算子数字滤波器结构传输函数及其等效状态空间实现...为解决传统数字滤波器在有限精度实现时因有限字长(Finite Word Length,FWL)效应导致滤波器性能下降的问题,提出一种L_(2)灵敏度最小化的数字滤波器状态空间实现稀疏化方法.推导前向差分算子数字滤波器结构传输函数及其等效状态空间实现,根据可控及可观格莱姆矩阵得到基于相似变换矩阵的L_(2)灵敏度表达式,并进行稀疏化校准,将L_(2)灵敏度最小化问题转换为凸函数求最值问题,求导得到L_(2)灵敏度最小化表达式,代回即得前向差分算子数字滤波器的稀疏化状态空间实现.仿真结果表明,所提方法设计的数字滤波器具有更好的抗FWL效应.展开更多
目的 分析2011—2022年我国妇幼保健机构申请和获得国家自然科学基金(National Natural Science Foundation of China,NSFC)项目资助情况,为妇幼保健机构科研能力建设提供参考。方法 运用NSFC大数据知识管理服务平台和全国妇幼保健机构...目的 分析2011—2022年我国妇幼保健机构申请和获得国家自然科学基金(National Natural Science Foundation of China,NSFC)项目资助情况,为妇幼保健机构科研能力建设提供参考。方法 运用NSFC大数据知识管理服务平台和全国妇幼保健机构监测数据,分析NSFC项目申请、获资助、负责人等基本情况,比较获资助和未获资助机构在人力资源和承担科研课题项目上的差异性。结果 2011—2022年我国35家妇幼保健机构作为NSFC依托单位共申请项目861项,获资助率为10.57%;青年科学基金、面上项目、地区科学基金为主要申请和获资助类型,获资助率分别为7.27%、5.34%和15.21%,存在类别间和地区间差异。55.8%的项目负责人在首次获资助前参与过NSFC项目,且78.13%为高等院校牵头项目;项目负责人中,高级职称占58.25%、博士研究生学历占62.64%;获资助机构承担或独立承担科研课题项目数多于未获资助机构,差异有统计学意义(P <0.05)。结论 我国妇幼保健机构科研能力仍相对薄弱,人才储备和科研基础是项目申请成功的有利因素,妇幼保健机构应加强科研人才的引进与培养,以需求为牵引,关注政策导向,聚焦学术前沿,注重学科交叉,增强合作,推动科研创新能力提升,助力妇幼保健机构可持续、高质量地发展。展开更多
目的分析2018-2022年国家自然科学基金(National Natural Science Foundation of China,NSFC)医学免疫学领域结题项目,探讨该领域的发展现状及存在的问题,为未来项目申请和优化资金导向提供参考。方法以科学基金共享服务网作为数据来源...目的分析2018-2022年国家自然科学基金(National Natural Science Foundation of China,NSFC)医学免疫学领域结题项目,探讨该领域的发展现状及存在的问题,为未来项目申请和优化资金导向提供参考。方法以科学基金共享服务网作为数据来源,获取2018-2022年NSFC医学免疫学领域已结题项目的项目名称、项目类别、资助经费、分支学科代码、依托单位、项目关键词、研究成果等信息,并借助Microsoft Excel 2021、CiteSpace 6.1.R6和VOSviewer 1.6.18软件进行可视化分析。结果2018-2022年NSFC医学免疫学领域结题项目共1206项,资助经费60154.5万元,来自30个省、市和自治区,其中57.88%的项目集中在上海(191项)、北京(184项)、江苏(136项)、广东(127项)、山东(60项),南方地区的结题数量是北方地区的2.43倍;所有项目分属160家依托单位,主要集中在综合类大学,其中上海交通大学以64项的结题量排名第一;研究成果主要体现在期刊论文(7481篇)、人才培养(1748人)和专利(授权269项)三个方面;分支学科主要集中在H1104(炎症、感染与免疫)和H1107(自身免疫性疾病),其中类风湿关节炎(rheumatoid arthritis,RA)和系统性红斑狼疮(systemic lupus erythematosus,SLE)是该研究领域的热点疾病,巨噬细胞是热点细胞。结论2018-2022年,NSFC医学免疫学领域结题项目在地域、依托单位、研究成果类别和分支学科之间存在明显差异,研究热点主要集中在免疫调节和自身免疫性疾病。展开更多
文摘LIRR's Priject of "Research on Spalling Mechanism Due to Rapid Heating-up of Dense Refractory Castables" declared by Wang Zhanmin,vice-president of LIRR,will gain the fund support from National Natural Science Foundation of China in 2011.
文摘THE continental dynamics has become a goaI since the beginning of the 1990s and it will still bethe key subject in the 21st century. Orogenic belts, having experienced the most intensechanges of geotherm and mechanics in the lithosphere, are the important research object in thestudy of continental dynamics. For this reason, the study of orogenic belts forms a hot and dif-ficult point in the geological society and the concentration of efforts is needed for overcomingthis difficult point. China has the most orogenic belts of various types in the world, so the De-partment of Earth Sciences caught this scientific chance in the early 1990s, took the
文摘为解决传统数字滤波器在有限精度实现时因有限字长(Finite Word Length,FWL)效应导致滤波器性能下降的问题,提出一种L_(2)灵敏度最小化的数字滤波器状态空间实现稀疏化方法.推导前向差分算子数字滤波器结构传输函数及其等效状态空间实现,根据可控及可观格莱姆矩阵得到基于相似变换矩阵的L_(2)灵敏度表达式,并进行稀疏化校准,将L_(2)灵敏度最小化问题转换为凸函数求最值问题,求导得到L_(2)灵敏度最小化表达式,代回即得前向差分算子数字滤波器的稀疏化状态空间实现.仿真结果表明,所提方法设计的数字滤波器具有更好的抗FWL效应.