Terahertz （THz） radiation, whose frequency ranges from 0.1 THz to 10.0 THz, has rich science, but limited technology. It has long been considered the last remaining scientific gap in the electromagnetic spectrum. Fa...Terahertz （THz） radiation, whose frequency ranges from 0.1 THz to 10.0 THz, has rich science, but limited technology. It has long been considered the last remaining scientific gap in the electromagnetic spectrum. Far from being fully exploited, it offers great opportunities in science, innovation, new technology, and potential applications. THz science and technology enables fundamental research directly impact our lives, from industrial quality control,展开更多
A real-time monitoring and 3D visualization analysis system is proposed for dam foundation curtain grouting. Based on the real-time control technology, the optimization method and the set theory, a mathematical model ...A real-time monitoring and 3D visualization analysis system is proposed for dam foundation curtain grouting. Based on the real-time control technology, the optimization method and the set theory, a mathematical model of the system is established. The real-time collection and transmission technology of the grouting data provides a data foundation for the system. The real-time grouting monitoring and dynamic alarming method helps the system control the grouting quality during the grouting process, thus, the abnormalities of grouting, such as jacking and hydraulic uplift, can be effectively controlled. In addition, the 3D grouting visualization analysis technology is proposed to establish the grouting information model(GIM). The GIM provides a platform to visualize and analyze the grouting process and results. The system has been applied to a hydraulic project of China as a case study, and the application results indicate that the real-time grouting monitoring and 3D visualization analysis for the grouting process can help engineers control the grouting quality more efficiently.展开更多
A novel adaptive detector for airborne radar space-time adaptive detection （STAD） in partially homogeneous environments is proposed. The novel detector combines the numerically stable Krylov subspace technique and d...A novel adaptive detector for airborne radar space-time adaptive detection （STAD） in partially homogeneous environments is proposed. The novel detector combines the numerically stable Krylov subspace technique and diagonal loading technique, and it uses the framework of the adaptive coherence estimator （ACE）. It can effectively detect a target with low sample support. Compared with its natural competitors, the novel detector has higher proba- bility of detection （PD）, especially when the number of the training data is low. Moreover, it is shown to be practically constant false alarm rate （CFAR）.展开更多
目的研究血培养瓶病原菌分离率及报阳时间(time to positivity,TTP)的区别,探讨厌氧瓶和双套送检方式对血流感染病原菌检出的价值。方法回顾性分析2019年1月至2021年12月杭州师范大学附属医院临床送检的54582瓶血培养数据,分析厌氧瓶病...目的研究血培养瓶病原菌分离率及报阳时间(time to positivity,TTP)的区别,探讨厌氧瓶和双套送检方式对血流感染病原菌检出的价值。方法回顾性分析2019年1月至2021年12月杭州师范大学附属医院临床送检的54582瓶血培养数据,分析厌氧瓶病原菌分离特点,比较厌氧瓶和需氧瓶病原菌分离率及TTP差异,分析双套送检方式病原菌分离数量特点。结果仅从厌氧瓶分离出的血培养病原菌占13.11%,血培养厌氧瓶TTP显著短于需氧瓶,差异有统计学意义(P<0.001)。双套送检标本阳性检出率高于单套送检标本阳性检出率,差异有统计学意义(P<0.05)。结论双套送检比单套或非成套送检血培养标本更能及时准确地分离病原菌。展开更多
针对典型感潮河网地区水环境污染日趋严重与洪涝灾害频发的问题,为优化河网水动力和降低河道漫溢风险,基于Info Works ICM(integrated catchment management)模型建立福州市仓山区龙津阳岐片区城市水文模型与一维河网水动力耦合模型,以2...针对典型感潮河网地区水环境污染日趋严重与洪涝灾害频发的问题,为优化河网水动力和降低河道漫溢风险,基于Info Works ICM(integrated catchment management)模型建立福州市仓山区龙津阳岐片区城市水文模型与一维河网水动力耦合模型,以2022年6月14日实测降雨及河道水位数据对模型参数进行校准,平均纳什效率系数为0.78,平均洪峰误差为1.5%。设计并模拟3种晴天工况和3种“卢碧”台风雨天工况,结果表明:晴天从无调控到工况3,随着引水量的增加,河网平均流速逐步增加,总体增加66.4%,河道水动力提升显著;雨天从原有调控工况到工况3,随着河道预降水位值增大,关键断面平均超警历时逐步减少,总体下降73%,河道漫溢风险明显降低。构建河网水文水动力耦合模型和工况优选,可为仓山区进一步提升河网水动力与城市汛期洪涝灾害防治能力的方案制定提供决策依据,也可为其他同类研究提供借鉴。展开更多
文摘Terahertz （THz） radiation, whose frequency ranges from 0.1 THz to 10.0 THz, has rich science, but limited technology. It has long been considered the last remaining scientific gap in the electromagnetic spectrum. Far from being fully exploited, it offers great opportunities in science, innovation, new technology, and potential applications. THz science and technology enables fundamental research directly impact our lives, from industrial quality control,
基金Supported by the Innovative Research Groups of the National Natural Science Foundation of China(No.51321065)the National Natural Science Foundation of China(No.51339003 and No.51439005)
文摘A real-time monitoring and 3D visualization analysis system is proposed for dam foundation curtain grouting. Based on the real-time control technology, the optimization method and the set theory, a mathematical model of the system is established. The real-time collection and transmission technology of the grouting data provides a data foundation for the system. The real-time grouting monitoring and dynamic alarming method helps the system control the grouting quality during the grouting process, thus, the abnormalities of grouting, such as jacking and hydraulic uplift, can be effectively controlled. In addition, the 3D grouting visualization analysis technology is proposed to establish the grouting information model(GIM). The GIM provides a platform to visualize and analyze the grouting process and results. The system has been applied to a hydraulic project of China as a case study, and the application results indicate that the real-time grouting monitoring and 3D visualization analysis for the grouting process can help engineers control the grouting quality more efficiently.
基金supported by the National Natural Science Foundation of China(609250056110216961501505)
文摘A novel adaptive detector for airborne radar space-time adaptive detection （STAD） in partially homogeneous environments is proposed. The novel detector combines the numerically stable Krylov subspace technique and diagonal loading technique, and it uses the framework of the adaptive coherence estimator （ACE）. It can effectively detect a target with low sample support. Compared with its natural competitors, the novel detector has higher proba- bility of detection （PD）, especially when the number of the training data is low. Moreover, it is shown to be practically constant false alarm rate （CFAR）.
文摘目的研究血培养瓶病原菌分离率及报阳时间(time to positivity,TTP)的区别,探讨厌氧瓶和双套送检方式对血流感染病原菌检出的价值。方法回顾性分析2019年1月至2021年12月杭州师范大学附属医院临床送检的54582瓶血培养数据,分析厌氧瓶病原菌分离特点,比较厌氧瓶和需氧瓶病原菌分离率及TTP差异,分析双套送检方式病原菌分离数量特点。结果仅从厌氧瓶分离出的血培养病原菌占13.11%,血培养厌氧瓶TTP显著短于需氧瓶,差异有统计学意义(P<0.001)。双套送检标本阳性检出率高于单套送检标本阳性检出率,差异有统计学意义(P<0.05)。结论双套送检比单套或非成套送检血培养标本更能及时准确地分离病原菌。
文摘针对典型感潮河网地区水环境污染日趋严重与洪涝灾害频发的问题,为优化河网水动力和降低河道漫溢风险,基于Info Works ICM(integrated catchment management)模型建立福州市仓山区龙津阳岐片区城市水文模型与一维河网水动力耦合模型,以2022年6月14日实测降雨及河道水位数据对模型参数进行校准,平均纳什效率系数为0.78,平均洪峰误差为1.5%。设计并模拟3种晴天工况和3种“卢碧”台风雨天工况,结果表明:晴天从无调控到工况3,随着引水量的增加,河网平均流速逐步增加,总体增加66.4%,河道水动力提升显著;雨天从原有调控工况到工况3,随着河道预降水位值增大,关键断面平均超警历时逐步减少,总体下降73%,河道漫溢风险明显降低。构建河网水文水动力耦合模型和工况优选,可为仓山区进一步提升河网水动力与城市汛期洪涝灾害防治能力的方案制定提供决策依据,也可为其他同类研究提供借鉴。
