This paper focuses on eliminating the unphysical negative susceptibility which ap- pears when magnetic field is at unsaturated excitation level and reduces from extremity of the hysteresis loop in one-dimension couple...This paper focuses on eliminating the unphysical negative susceptibility which ap- pears when magnetic field is at unsaturated excitation level and reduces from extremity of the hysteresis loop in one-dimension coupled hysteresis model. The domain flexing function c （H） is used to replace the domain flexing constant c in one-dimension coupled hysteresis model. The fea- sibility and rationality of proposed modification are convinced by comparing the magnetization and magnetostriction curves with experimental data and another typical modification results. The effects of pre-stress and temperature on magnetic-elastic-thermal coupling property and hysteresis behavior are investigated.展开更多
Differential Code Bias(DCB)is the time delays between two different GNSS signals,which is crucial for GNSS positioning.Previous studies have shown that it can be significantly affected by the flex power operations in ...Differential Code Bias(DCB)is the time delays between two different GNSS signals,which is crucial for GNSS positioning.Previous studies have shown that it can be significantly affected by the flex power operations in satellites.This study proposes a 15-min short-term DCB estimation method to analyze flex power's impact on DCB variations.The method jointly estimates satellite DCB,receiver DCB,and ionospheric parameters using over 300 MGEX stations.We examined three representative flex power events in 2024,achieving average internal RMS values of 0.042 ns and 0.0068 ns for inter-frequency and intra-frequency scenarios respectively.Results show that intra-frequency DCB exhibits clear shift biases synchronized with flex power state transitions while maintaining stability within 0.20 ns during nontransition periods.No definitive impact on inter-frequency DCB was observed at current estimation precision levels.展开更多
The non-aligned movement, representing two thirds of UN members, is gaining vigor in world affairs Imagine nearly two thirds of the UN members meeting together to discuss and reach consensus on international events. T...The non-aligned movement, representing two thirds of UN members, is gaining vigor in world affairs Imagine nearly two thirds of the UN members meeting together to discuss and reach consensus on international events. This is what happened in Havana, Cuba, at the 14th Non-Aligned Countries Movement (NAM) Summit from September 11-16. Cuba, the new holder展开更多
Nearly 200 million Chinese people opt for non-traditional forms of employment Soon after graduation,Wu Mengwei,an electronic and information engineering major,followed his passion and became a writer contributing to o...Nearly 200 million Chinese people opt for non-traditional forms of employment Soon after graduation,Wu Mengwei,an electronic and information engineering major,followed his passion and became a writer contributing to online novel websites.He usually works five to six hours every night and jots down some 4,000 to 6,000 words.展开更多
本文聚焦我国青海湖流域的水文过程,基于多年气象和水文动态数据,发展了一种融合概念性水文模型FLEX (FluxExchange)和门控循环单元(Gated Recurrent Unit, GRU)的混合模型对流域内最大支流布哈河的逐日径流进行了模拟和预测。在构建混...本文聚焦我国青海湖流域的水文过程,基于多年气象和水文动态数据,发展了一种融合概念性水文模型FLEX (FluxExchange)和门控循环单元(Gated Recurrent Unit, GRU)的混合模型对流域内最大支流布哈河的逐日径流进行了模拟和预测。在构建混合模型中,采用了三种策略提升模拟精度:引入差分进化自适应算法DREAM(zs)反演水文参数优化FLEX模型;采用变分模态分解(VMD)提取径流数据的信息和特征;利用麻雀搜索算法(SSA)优化深度学习GRU的参数。研究将FLEX模型的模拟结果连同气象数据一起作为神经网络的输入,从而构建了FLEX-VMD-SSA-GRU混合模型。同时,探讨了不同的气象输入条件对模拟结果的影响和贡献:基于7个主要气象要素,由少及多设置了14组输入情景模拟。最后通过SHAP对深度学习方法的结果进行分析,揭示了气象变量对径流长期趋势的贡献和重要度。展开更多
本刊于2024年57卷第6期在632~639页刊发的稿件《FlexE/SPN互通协同管控技术标准化研究》中,第632页的“基金项目:国家重点研发计划(2022YFB2903200);国网江苏省电力有限公司科技项目资助(J2023040)”“Foundation Item:National Key Res...本刊于2024年57卷第6期在632~639页刊发的稿件《FlexE/SPN互通协同管控技术标准化研究》中,第632页的“基金项目:国家重点研发计划(2022YFB2903200);国网江苏省电力有限公司科技项目资助(J2023040)”“Foundation Item:National Key Research and Development Program of China(2022YFB2903200);State Grid Jiangsu Electric Power Co.,Ltd.’s Technology Project(J2023040)”应修改为“基金项目:国网江苏省电力有限公司科技项目:面向电力通信的FlexE组网互通方案和关键技术研究(J2023040)”“Foundation Item:State Grid Jiangsu Electric Power Co.,Ltd.Technology Project:Research on FlexE Network Interconnection Scheme and Key Technologies for Power Communication(J2023040)”。展开更多
基金supported by the Fund of Natural Science Foundation of China(Nos.10972094,11032006,11121202 and 11202087)the Fundamental Research Funds for the Central Universities(No.lzujbky-2011-6)Specialized Research Fund for the Doctoral Program of Higher Education(No.20110211120027)
文摘This paper focuses on eliminating the unphysical negative susceptibility which ap- pears when magnetic field is at unsaturated excitation level and reduces from extremity of the hysteresis loop in one-dimension coupled hysteresis model. The domain flexing function c （H） is used to replace the domain flexing constant c in one-dimension coupled hysteresis model. The fea- sibility and rationality of proposed modification are convinced by comparing the magnetization and magnetostriction curves with experimental data and another typical modification results. The effects of pre-stress and temperature on magnetic-elastic-thermal coupling property and hysteresis behavior are investigated.
基金the funds from the Key Laboratory of Smart Earth(KF2023YB01-07)Shanghai Collaborative Innovation Fund(XTCX-KJ-2024-17)the National Natural Science Foundation of China(42388102,62303311,and 62231010)。
文摘Differential Code Bias(DCB)is the time delays between two different GNSS signals,which is crucial for GNSS positioning.Previous studies have shown that it can be significantly affected by the flex power operations in satellites.This study proposes a 15-min short-term DCB estimation method to analyze flex power's impact on DCB variations.The method jointly estimates satellite DCB,receiver DCB,and ionospheric parameters using over 300 MGEX stations.We examined three representative flex power events in 2024,achieving average internal RMS values of 0.042 ns and 0.0068 ns for inter-frequency and intra-frequency scenarios respectively.Results show that intra-frequency DCB exhibits clear shift biases synchronized with flex power state transitions while maintaining stability within 0.20 ns during nontransition periods.No definitive impact on inter-frequency DCB was observed at current estimation precision levels.
文摘The non-aligned movement, representing two thirds of UN members, is gaining vigor in world affairs Imagine nearly two thirds of the UN members meeting together to discuss and reach consensus on international events. This is what happened in Havana, Cuba, at the 14th Non-Aligned Countries Movement (NAM) Summit from September 11-16. Cuba, the new holder
文摘Nearly 200 million Chinese people opt for non-traditional forms of employment Soon after graduation,Wu Mengwei,an electronic and information engineering major,followed his passion and became a writer contributing to online novel websites.He usually works five to six hours every night and jots down some 4,000 to 6,000 words.
文摘本文聚焦我国青海湖流域的水文过程,基于多年气象和水文动态数据,发展了一种融合概念性水文模型FLEX (FluxExchange)和门控循环单元(Gated Recurrent Unit, GRU)的混合模型对流域内最大支流布哈河的逐日径流进行了模拟和预测。在构建混合模型中,采用了三种策略提升模拟精度:引入差分进化自适应算法DREAM(zs)反演水文参数优化FLEX模型;采用变分模态分解(VMD)提取径流数据的信息和特征;利用麻雀搜索算法(SSA)优化深度学习GRU的参数。研究将FLEX模型的模拟结果连同气象数据一起作为神经网络的输入,从而构建了FLEX-VMD-SSA-GRU混合模型。同时,探讨了不同的气象输入条件对模拟结果的影响和贡献:基于7个主要气象要素,由少及多设置了14组输入情景模拟。最后通过SHAP对深度学习方法的结果进行分析,揭示了气象变量对径流长期趋势的贡献和重要度。
文摘本刊于2024年57卷第6期在632~639页刊发的稿件《FlexE/SPN互通协同管控技术标准化研究》中,第632页的“基金项目:国家重点研发计划(2022YFB2903200);国网江苏省电力有限公司科技项目资助(J2023040)”“Foundation Item:National Key Research and Development Program of China(2022YFB2903200);State Grid Jiangsu Electric Power Co.,Ltd.’s Technology Project(J2023040)”应修改为“基金项目:国网江苏省电力有限公司科技项目:面向电力通信的FlexE组网互通方案和关键技术研究(J2023040)”“Foundation Item:State Grid Jiangsu Electric Power Co.,Ltd.Technology Project:Research on FlexE Network Interconnection Scheme and Key Technologies for Power Communication(J2023040)”。
