Metal-organic frameworks(MOFs)have been extensively used for gas sorption,storage and separation owing to ultrahigh porosity,exceptional thermal stability,and wide structural diversity.However,when it comes to ultra-l...Metal-organic frameworks(MOFs)have been extensively used for gas sorption,storage and separation owing to ultrahigh porosity,exceptional thermal stability,and wide structural diversity.However,when it comes to ultra-low concentration gas detection,technical bottlenecks of MOFs appear due to the poor adsorption capacity at ppm-/ppblevel concentration and the limited sensitivity for signal transduction.Here,we present hybrid MOF-polymer physi-chemisorption mechanisms integrated with infrared(IR)nanoantennas for highly selective and ultrasensitive CO_(2) detection.To improve the adsorption capacity for trace amounts of gas molecules,MOFs are decorated with amino groups to introduce the chemisorption while maintaining the structural integrity for physisorption.Additionally,leveraging all major optimization methods,a multi-hotspot strategy is proposed to improve the sensitivity of nanoantennas by enhancing the near field and engineering the radiative and absorptive loss.As a benefit,we demonstrate the competitive advantages of our strategy against the state-of-the-art miniaturized IR CO_(2) sensors,including low detection limit,high sensitivity(0.18%/ppm),excellent reversibility(variation within 2%),and high selectivity(against C_(2)H_(5)OH,CH_(3)OH,N_(2)).This work provides valuable insights into the integration of advanced porous materials and nanophotonic devices,which can be further adopted in ultra-low concentration gas monitoring in industry and environmental applications.展开更多
针对轻量级模型在光刻热点检测中特征提取能力不足的问题,提出以改进重排网络第2版(shuffle net version 2,ShuffleNetV2)为主干网络,引入多尺度双重注意力(multi-scale dual attention,MSDA)模块,同时融合梯度协调机制(gradient harmon...针对轻量级模型在光刻热点检测中特征提取能力不足的问题,提出以改进重排网络第2版(shuffle net version 2,ShuffleNetV2)为主干网络,引入多尺度双重注意力(multi-scale dual attention,MSDA)模块,同时融合梯度协调机制(gradient harmonizing mechanism,GHM)和基于度量学习思想的加性角度边距(additive angular margin,AAM)的光刻热点检测模型——ShuffleNetV2-MSDA-GHM-AAM(SMGA)。该模型提升了对不同尺度上下文信息的建模与感知能力,优化了特征嵌入空间的类间判别性,缓解了数据集的不平衡。在2012年国际计算机辅助设计会议(2012 international conference on computer-aided design,ICCAD 2012)数据集上进行实验,结果显示,SMGA模型在保持98.22%的较高检测召回率的同时,平均误报数量降低到484个。该模型为实现集成电路设计阶段的高效、低成本光刻热点检测提供了可行方案,具有重要的工程应用价值和推广前景。展开更多
安全多方计算技术为不泄露隐私数据的多方参与协同计算提供新的解决方法,该领域一直受到中外密码学学者的重点关注。为客观地反映当前安全多方计算的研究现状,探讨安全多方计算的基本知识和研究热点。以Web of Science核心合集数据库198...安全多方计算技术为不泄露隐私数据的多方参与协同计算提供新的解决方法,该领域一直受到中外密码学学者的重点关注。为客观地反映当前安全多方计算的研究现状,探讨安全多方计算的基本知识和研究热点。以Web of Science核心合集数据库1985—2020年的安全多方计算相关研究文献为基础,采用文献计量的可视化分析方法,对研究文献进行年发文量分布、期刊分布、核心作者、研究机构、引文分析、关键词共现分析6个方面进行定量统计和定性分析。结果表明:安全多方计算已经成为密码学界关注的一个研究热点,文献年发文量总体上保持增长的趋势,但中外的学术研究团体呈现地域化特点,互动交流较少。研究热点主要围绕安全多方计算模型研究、应用协议研究、基础模块研究和量子安全多方计算4个方面。可见随着新形势下隐私信息安全越来越被重视,安全多方计算将迎来广泛的研究和应用前景。展开更多
基金This work is supported by the RIE Advanced Manufacturing and Engineering(AME)Programmatic Grant Project(Grant A18A5b0056,WBS:A-0005117-02-00)the Advanced Research and Technology Innovation Centre(ARTIC)Project(WBS:A-0005947-20-00)the Ministry of Education(MOE)of Singapore Tier 1 Project(WBS:A-0005138-01-00).
文摘Metal-organic frameworks(MOFs)have been extensively used for gas sorption,storage and separation owing to ultrahigh porosity,exceptional thermal stability,and wide structural diversity.However,when it comes to ultra-low concentration gas detection,technical bottlenecks of MOFs appear due to the poor adsorption capacity at ppm-/ppblevel concentration and the limited sensitivity for signal transduction.Here,we present hybrid MOF-polymer physi-chemisorption mechanisms integrated with infrared(IR)nanoantennas for highly selective and ultrasensitive CO_(2) detection.To improve the adsorption capacity for trace amounts of gas molecules,MOFs are decorated with amino groups to introduce the chemisorption while maintaining the structural integrity for physisorption.Additionally,leveraging all major optimization methods,a multi-hotspot strategy is proposed to improve the sensitivity of nanoantennas by enhancing the near field and engineering the radiative and absorptive loss.As a benefit,we demonstrate the competitive advantages of our strategy against the state-of-the-art miniaturized IR CO_(2) sensors,including low detection limit,high sensitivity(0.18%/ppm),excellent reversibility(variation within 2%),and high selectivity(against C_(2)H_(5)OH,CH_(3)OH,N_(2)).This work provides valuable insights into the integration of advanced porous materials and nanophotonic devices,which can be further adopted in ultra-low concentration gas monitoring in industry and environmental applications.
文摘针对轻量级模型在光刻热点检测中特征提取能力不足的问题,提出以改进重排网络第2版(shuffle net version 2,ShuffleNetV2)为主干网络,引入多尺度双重注意力(multi-scale dual attention,MSDA)模块,同时融合梯度协调机制(gradient harmonizing mechanism,GHM)和基于度量学习思想的加性角度边距(additive angular margin,AAM)的光刻热点检测模型——ShuffleNetV2-MSDA-GHM-AAM(SMGA)。该模型提升了对不同尺度上下文信息的建模与感知能力,优化了特征嵌入空间的类间判别性,缓解了数据集的不平衡。在2012年国际计算机辅助设计会议(2012 international conference on computer-aided design,ICCAD 2012)数据集上进行实验,结果显示,SMGA模型在保持98.22%的较高检测召回率的同时,平均误报数量降低到484个。该模型为实现集成电路设计阶段的高效、低成本光刻热点检测提供了可行方案,具有重要的工程应用价值和推广前景。
文摘安全多方计算技术为不泄露隐私数据的多方参与协同计算提供新的解决方法,该领域一直受到中外密码学学者的重点关注。为客观地反映当前安全多方计算的研究现状,探讨安全多方计算的基本知识和研究热点。以Web of Science核心合集数据库1985—2020年的安全多方计算相关研究文献为基础,采用文献计量的可视化分析方法,对研究文献进行年发文量分布、期刊分布、核心作者、研究机构、引文分析、关键词共现分析6个方面进行定量统计和定性分析。结果表明:安全多方计算已经成为密码学界关注的一个研究热点,文献年发文量总体上保持增长的趋势,但中外的学术研究团体呈现地域化特点,互动交流较少。研究热点主要围绕安全多方计算模型研究、应用协议研究、基础模块研究和量子安全多方计算4个方面。可见随着新形势下隐私信息安全越来越被重视,安全多方计算将迎来广泛的研究和应用前景。
