变压器作为电力系统的关键设备,其绕组松动状态的识别对电网的稳定运行具有重要意义。针对传统监测方法环境干扰较大、应用复杂等问题,提出了使用两类不同的布拉格光纤光栅(Fiber bragg grating,FBG)传感器采集变压器绕组关键测点温度...变压器作为电力系统的关键设备,其绕组松动状态的识别对电网的稳定运行具有重要意义。针对传统监测方法环境干扰较大、应用复杂等问题,提出了使用两类不同的布拉格光纤光栅(Fiber bragg grating,FBG)传感器采集变压器绕组关键测点温度与应变信号,经快速解耦与自适应噪声完备集合经验模态分解后(Fast decoupling and complete ensemble empirical mode decomposition with adaptive noise,DECE),提取关键参数并进行主元分析(Principal component analysis,PCA)。对降维后的特征采用基于黑洞优化的支持向量机(Support vector machine based on black hole optimization,BHOSVM)进行分类,实现对变压器绕组径向松动状态的监测与定位。诊断结果表明,所提诊断方法对变压器绕组径向松动状态的识别准确率达到96.8%。展开更多
Monitoring shear deformation of sliding zones is of great significance for understanding the landslide evolution mechanism,in which fiber optic strain sensing has shown great potential.However,the cor-relation between...Monitoring shear deformation of sliding zones is of great significance for understanding the landslide evolution mechanism,in which fiber optic strain sensing has shown great potential.However,the cor-relation between strain measurements of quasi-distributed fiber Bragg grating(FBG)sensing arrays and shear displacements of surrounding soil remains elusive.In this study,a direct shear model test was conducted to simulate the shear deformation of sliding zones,in which the soil internal deformation was captured using FBG strain sensors and the soil surface deformation was measured by particle image velocimetry(PIV).The test results show that there were two main slip surfaces and two secondary ones,developing a spindle-shaped shear band in the soil.The formation of the shear band was successfully captured by FBG sensors.A sinusoidal model was proposed to describe the fiber optic cable deformation behavior.On this basis,the shear displacements and shear band widths were calculated by using strain measurements.This work provides important insight into the deduction of soil shear deformation using soil-embedded FBG strain sensors.展开更多
目的探究老年糖尿病治疗中采用甘精胰岛素联合阿卡波糖的价值。方法选取上海市嘉定区迎园医院于2022年6月—2023年9月收治的106例糖尿病老年患者作为研究对象,按随机数表法分为对照组(53例,给予阿卡波糖治疗)、观察组(53例,给予甘精胰...目的探究老年糖尿病治疗中采用甘精胰岛素联合阿卡波糖的价值。方法选取上海市嘉定区迎园医院于2022年6月—2023年9月收治的106例糖尿病老年患者作为研究对象,按随机数表法分为对照组(53例,给予阿卡波糖治疗)、观察组(53例,给予甘精胰岛素联合阿卡波糖治疗)。比较两组临床疗效、血糖指标、体质指数(Body Mass Index,BMI)、不良反应发生情况以及胰岛功能。结果观察组治疗总有效率高于对照组,差异有统计学意义(P<0.05);观察组空腹血糖(Fasting Blood Glucose,FBG)、餐后2 h血糖(2 Hour Post⁃prandial Blood Glucose,2 hBG)以及糖化血红蛋白(Hemoglobin A1c,HbA1c)均低于对照组,差异有统计学意义(P均<0.05);观察组体质指数高于对照组,差异有统计学意义(P<0.05);观察组不良反应总发生率与对照组比较,差异无统计学意义(P>0.05);观察组胰岛素抵抗指数(Homeostatic Model Assessment of Insulin Resis⁃tance,HOMA-IR)低于对照组,胰岛β细胞功能指数(Homeostasis Model Assessment-β,HOMA-β)高于对照组,差异有统计学意义(P均<0.05)。结论在老年糖尿病治疗中选择甘精胰岛素与阿卡波糖联合方案可降低血糖水平,改善体质指数及胰岛素功能,确保治疗有效性。展开更多
文摘变压器作为电力系统的关键设备,其绕组松动状态的识别对电网的稳定运行具有重要意义。针对传统监测方法环境干扰较大、应用复杂等问题,提出了使用两类不同的布拉格光纤光栅(Fiber bragg grating,FBG)传感器采集变压器绕组关键测点温度与应变信号,经快速解耦与自适应噪声完备集合经验模态分解后(Fast decoupling and complete ensemble empirical mode decomposition with adaptive noise,DECE),提取关键参数并进行主元分析(Principal component analysis,PCA)。对降维后的特征采用基于黑洞优化的支持向量机(Support vector machine based on black hole optimization,BHOSVM)进行分类,实现对变压器绕组径向松动状态的监测与定位。诊断结果表明,所提诊断方法对变压器绕组径向松动状态的识别准确率达到96.8%。
基金This work was financially supported by the National Natural Science Foundation of China(Grant Nos.42225702 and 42077235)the Open Research Project Program of the State Key Laboratory of Internet of Things for Smart City(University of Macao)(Grant No.SKL-IoTSC(UM)-2021-2023/ORP/GA10/2022)。
文摘Monitoring shear deformation of sliding zones is of great significance for understanding the landslide evolution mechanism,in which fiber optic strain sensing has shown great potential.However,the cor-relation between strain measurements of quasi-distributed fiber Bragg grating(FBG)sensing arrays and shear displacements of surrounding soil remains elusive.In this study,a direct shear model test was conducted to simulate the shear deformation of sliding zones,in which the soil internal deformation was captured using FBG strain sensors and the soil surface deformation was measured by particle image velocimetry(PIV).The test results show that there were two main slip surfaces and two secondary ones,developing a spindle-shaped shear band in the soil.The formation of the shear band was successfully captured by FBG sensors.A sinusoidal model was proposed to describe the fiber optic cable deformation behavior.On this basis,the shear displacements and shear band widths were calculated by using strain measurements.This work provides important insight into the deduction of soil shear deformation using soil-embedded FBG strain sensors.
文摘目的探究老年糖尿病治疗中采用甘精胰岛素联合阿卡波糖的价值。方法选取上海市嘉定区迎园医院于2022年6月—2023年9月收治的106例糖尿病老年患者作为研究对象,按随机数表法分为对照组(53例,给予阿卡波糖治疗)、观察组(53例,给予甘精胰岛素联合阿卡波糖治疗)。比较两组临床疗效、血糖指标、体质指数(Body Mass Index,BMI)、不良反应发生情况以及胰岛功能。结果观察组治疗总有效率高于对照组,差异有统计学意义(P<0.05);观察组空腹血糖(Fasting Blood Glucose,FBG)、餐后2 h血糖(2 Hour Post⁃prandial Blood Glucose,2 hBG)以及糖化血红蛋白(Hemoglobin A1c,HbA1c)均低于对照组,差异有统计学意义(P均<0.05);观察组体质指数高于对照组,差异有统计学意义(P<0.05);观察组不良反应总发生率与对照组比较,差异无统计学意义(P>0.05);观察组胰岛素抵抗指数(Homeostatic Model Assessment of Insulin Resis⁃tance,HOMA-IR)低于对照组,胰岛β细胞功能指数(Homeostasis Model Assessment-β,HOMA-β)高于对照组,差异有统计学意义(P均<0.05)。结论在老年糖尿病治疗中选择甘精胰岛素与阿卡波糖联合方案可降低血糖水平,改善体质指数及胰岛素功能,确保治疗有效性。
