掺铁碳化硅陶瓷的制备及其吸波性能

将羰基铁和液态聚碳硅烷(LPCS)反应生成的铁(Fe)溶胶与固态聚碳硅烷(PCS)混合,合成出不同Fe质量分数的PCS先驱体,然后经氧化交联和高温热解制备了不同Fe质量分数的磁性碳化硅陶瓷(Fe/SiC),系统地研究了Fe元素的引入对SiC陶瓷的组成、结构、磁性能和介电性能的影响规律。研究发现,当Fe质量分数小于8.94%时,在热解过程中,Fe元素可以显著促进SiCxOy的分解,生成β-SiC,且随着Fe质量分数的增加,β-SiC的结晶峰越来越强;但随着Fe质量分数继续增加,达11.78%时,则主要生成Fe3Si;Fe/Si C陶瓷均呈铁磁性,其饱和磁化强度随着Fe质量分数的增加而呈指数形式增加;当Fe质量分数为4.19%时Fe/SiC陶瓷在12.4 GHz具有最小的反射损耗,为-9.4 dB,同时低于-5 dB的带宽为2.4 GHz,Fe质量分数为8.94%时,低于-5 dB的带宽则为3.7 GHz,可用作良好的微波吸收材料。国家自然科学基金(51603175);;中央高校基本科研业务费(20720150082)资助项目~

科研实体名称规范的研究与实践

【目的】建立机构规范、作者规范、期刊规范、基金规范, 为发现系统、科研实体分析评价等建立数据基 础。 【方法】以多源异构数据为基础, 对数据进行汇聚和融合, 形成具有唯一标识符的统一的结构化数据。依据 名称规范元数据模型, 对科研实体及实体间的关系进行抽取。针对不同的科研实体可获取的文献特征, 制定不同 的消歧规则集合, 结合传统字符串匹配方法和深度学习方法进行文本相似度计算。【结果】形成包含 260 多万条 数据的机构规范库、2 300 多万条数据的作者规范库、3万多条数据的期刊规范库和 200 多万条数据的基金规范 库。以 NSTL机构规范为例, 与 InCites 机构规范进行对比, 结果显示所遴选的美、英、中 3个国家的 6所高校, 对 标吻合度平均值达到 86.8%。【局限】所提出的消歧规则和算法在处理文献特征表达形式多样性方面有待进一步 细化和提升；需对具体数据源数据情况进行分析，以选择合适的算法模型。【结论】本研究提出了多源异构数据 汇聚融合方法, 设计了科研实体消歧规则和算法, 能够有效实现名称规范数据库建设的规范性和全面性。</p

JUNO Sensitivity on Proton Decay p→νˉK+p\to \bar\nu K^+ Searches

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this paper, the potential on searching for proton decay in $p\to \bar\nu K^+$ mode with JUNO is investigated.The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits to suppress the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar\nu K^+$ is 36.9% with a background level of 0.2 events after 10 years of data taking. The estimated sensitivity based on 200 kton-years exposure is $9.6 \times 10^{33}$ years, competitive with the current best limits on the proton lifetime in this channel

JUNO sensitivity on proton decay p → ν K + searches*

The Jiangmen Underground Neutrino Observatory (JUNO) is a large liquid scintillator detector designed to explore many topics in fundamental physics. In this study, the potential of searching for proton decay in the $p\to \bar{\nu} K^+$ mode with JUNO is investigated. The kaon and its decay particles feature a clear three-fold coincidence signature that results in a high efficiency for identification. Moreover, the excellent energy resolution of JUNO permits suppression of the sizable background caused by other delayed signals. Based on these advantages, the detection efficiency for the proton decay via $p\to \bar{\nu} K^+$ is 36.9% ± 4.9% with a background level of $0.2\pm 0.05({\rm syst})\pm$$0.2({\rm stat})$ events after 10 years of data collection. The estimated sensitivity based on 200 kton-years of exposure is $9.6 \times 10^{33}$ years, which is competitive with the current best limits on the proton lifetime in this channel and complements the use of different detection technologies