The qualities of petrology and paleobiology in Wuzhishan Section are studied. Several geo-chemical anomalies are recognized, such as: high rare earth element content, high pyrite content and Ni anomalies. It could be ...The qualities of petrology and paleobiology in Wuzhishan Section are studied. Several geo-chemical anomalies are recognized, such as: high rare earth element content, high pyrite content and Ni anomalies. It could be correlated with Nandong Section in Xiangzhou County and the F/F boundary could be determined according to Ni anomalies. The results of the study indicate that the geochemical anomaly plays an important role in stratigraphic correlation in non-fossil stratum.展开更多
The general idea of holographic optical data storage (HODS) is briefly introduced. Based on the recent advances of HODS, the key techniques and the challenges of HODS are discussed. Some new techniques are proposed to...The general idea of holographic optical data storage (HODS) is briefly introduced. Based on the recent advances of HODS, the key techniques and the challenges of HODS are discussed. Some new techniques are proposed to improve the system. A miniaturized volume holographic data storage and correlation system is presented. It can achieve a density of 10 Gb/cm3 and a fast correlation recognition rate of more than 2000 images per second. It shows the attracting potential advantages over other conventional storage meth- ods in the information storage as well as information proc- essing.展开更多
为了降低研发风险,对eVTOL项目产品化指数问题进行了研究。采用改进的新产品评估指标体系,并利用灰色关联-最小二乘(GC-LS)法得到eVTOL项目产品化指数。该方法有效地减弱了产品化指数模型与层次分析法(AHP)中主观性的影响。对15款已公...为了降低研发风险,对eVTOL项目产品化指数问题进行了研究。采用改进的新产品评估指标体系,并利用灰色关联-最小二乘(GC-LS)法得到eVTOL项目产品化指数。该方法有效地减弱了产品化指数模型与层次分析法(AHP)中主观性的影响。对15款已公开的电动垂直起降飞行器(electric Vertical Take-Off and Landing,eVTOL)项目产品化指数进行了估计,其中14款用于确定最优权重,1款用于检验最优权重下的估计准确性。结果:1)最优权重下的估计结果与实际情况吻合较好。2)最优权重排名前三的为研发进度、安全性和社会接受度。结论:1)GC-LS法给出的最小二乘最优权重比较合理。2)研发进度、安全性和社会接受度三个要素对eVTOL项目产品化指数具有相对更重要的影响。3)利用GC-LS法可较方便准确地估计eVTOL项目的产品化指数。展开更多
气体绝缘开关设备(GIS)中的隔离开关操作,会产生特快速瞬态过电压(VFTO)和壳体电位升高(TEV)等问题。该研究旨在通过试验方法研究TEV和VFTO之间的关系,并分析TEV在GIS回路中的形成原因和传播规律。研究中,首先利用自制的TEV和VFTO测量系...气体绝缘开关设备(GIS)中的隔离开关操作,会产生特快速瞬态过电压(VFTO)和壳体电位升高(TEV)等问题。该研究旨在通过试验方法研究TEV和VFTO之间的关系,并分析TEV在GIS回路中的形成原因和传播规律。研究中,首先利用自制的TEV和VFTO测量系统,在武汉特高压交流试验基地对GIS隔离开关操作时产生的TEV和VFTO波形进行了测量。从暂态波形时间对应角度分析,所有统计的时间偏差均在[-90μs,20μs]的区间内,证明了2者在时序上的对应关系;从幅值比例关系角度,使用Spearman相关系数分析,证明了TEV波形上的脉冲电压与隔离开关断口间的击穿电压满足正比单值函数关系。通过引入比例系数,分析了试验回路上不同位置处的TEV幅值,从试验角度验证了行波传输理论对TEV成因的解释。该研究还给出了通过少量现场试验确定某一位置最大TEV的方法,估算试验回路中可能出现的TEV最大值为51.37 k V,这一估算方法能够为TEV的理论分析和仿真计算提供支持。展开更多
文摘The qualities of petrology and paleobiology in Wuzhishan Section are studied. Several geo-chemical anomalies are recognized, such as: high rare earth element content, high pyrite content and Ni anomalies. It could be correlated with Nandong Section in Xiangzhou County and the F/F boundary could be determined according to Ni anomalies. The results of the study indicate that the geochemical anomaly plays an important role in stratigraphic correlation in non-fossil stratum.
文摘The general idea of holographic optical data storage (HODS) is briefly introduced. Based on the recent advances of HODS, the key techniques and the challenges of HODS are discussed. Some new techniques are proposed to improve the system. A miniaturized volume holographic data storage and correlation system is presented. It can achieve a density of 10 Gb/cm3 and a fast correlation recognition rate of more than 2000 images per second. It shows the attracting potential advantages over other conventional storage meth- ods in the information storage as well as information proc- essing.
文摘为了降低研发风险,对eVTOL项目产品化指数问题进行了研究。采用改进的新产品评估指标体系,并利用灰色关联-最小二乘(GC-LS)法得到eVTOL项目产品化指数。该方法有效地减弱了产品化指数模型与层次分析法(AHP)中主观性的影响。对15款已公开的电动垂直起降飞行器(electric Vertical Take-Off and Landing,eVTOL)项目产品化指数进行了估计,其中14款用于确定最优权重,1款用于检验最优权重下的估计准确性。结果:1)最优权重下的估计结果与实际情况吻合较好。2)最优权重排名前三的为研发进度、安全性和社会接受度。结论:1)GC-LS法给出的最小二乘最优权重比较合理。2)研发进度、安全性和社会接受度三个要素对eVTOL项目产品化指数具有相对更重要的影响。3)利用GC-LS法可较方便准确地估计eVTOL项目的产品化指数。
文摘气体绝缘开关设备(GIS)中的隔离开关操作,会产生特快速瞬态过电压(VFTO)和壳体电位升高(TEV)等问题。该研究旨在通过试验方法研究TEV和VFTO之间的关系,并分析TEV在GIS回路中的形成原因和传播规律。研究中,首先利用自制的TEV和VFTO测量系统,在武汉特高压交流试验基地对GIS隔离开关操作时产生的TEV和VFTO波形进行了测量。从暂态波形时间对应角度分析,所有统计的时间偏差均在[-90μs,20μs]的区间内,证明了2者在时序上的对应关系;从幅值比例关系角度,使用Spearman相关系数分析,证明了TEV波形上的脉冲电压与隔离开关断口间的击穿电压满足正比单值函数关系。通过引入比例系数,分析了试验回路上不同位置处的TEV幅值,从试验角度验证了行波传输理论对TEV成因的解释。该研究还给出了通过少量现场试验确定某一位置最大TEV的方法,估算试验回路中可能出现的TEV最大值为51.37 k V,这一估算方法能够为TEV的理论分析和仿真计算提供支持。
