The mode-2 internal solitary waves(ISWs)generated by mode-2 internal tide(IT)are identified by mooring observations in the northern South China Sea(SCS)from 2016 to 2017.Two mode-2 ISWs with a re-appearance period of ...The mode-2 internal solitary waves(ISWs)generated by mode-2 internal tide(IT)are identified by mooring observations in the northern South China Sea(SCS)from 2016 to 2017.Two mode-2 ISWs with a re-appearance period of 24.9 h observed on 29 and 30 July 2016 are characterized by type-b ISWs.They occurred when the isotherms compressed obviously in the vertical direction.Modal decomposition of IT horizontal currents shows that the vertical compression of the isotherms is mainly caused by diurnal mode-2 IT.The analysis of the role of the density stratification reveals that a deeper and thinner pycnocline is favorable for generation of mode-2 ISWs rather than pycnocline intensity.By comparing the mode-2 nonlinear,dispersion coefficients and the Ursell numbers calculated based on the stratification associated with different kinds of ITs with the observation results,it is shown that the diurnal mode-2 IT plays a crucial role in the generation of the mode-2 ISWs.When the diurnal mode-2 IT interacts with the semidiurnal IT and causes a deeper and thinner pycnocline,the mode-2 ISWs are easily excited.展开更多
A series of experiments are designed to propose a new method to study the characteristics of convex mode-2internal solitary waves(ISWs)in optical remote sensing images using a laboratory-based optical remote sensing s...A series of experiments are designed to propose a new method to study the characteristics of convex mode-2internal solitary waves(ISWs)in optical remote sensing images using a laboratory-based optical remote sensing simulation platform.The corresponding wave parameters of large-amplitude convex mode-2 ISWs under smooth surfaces are investigated along with the optical remote sensing characteristic parameters.The mode-2 ISWs in the experimentally obtained optical remote sensing image are produced by their overall modulation effect on the water surface,and the extreme points of the gray value of the profile curve of bright-dark stripes appear at the same location as the real optical remote sensing image.The present data extend to a larger range than previous studies,and for the characteristics of large amplitude convex mode-2 ISWs,the experimental results show a second-order dependence of wavelength on amplitude.There is a close relationship between optical remote sensing characteristic parameters and wave parameters of mode-2 ISWs,in which there is a positive linear relationship between the bright-dark spacing and wavelength and a nonlinear relationship with the amplitude,especially when the amplitude is very large,there is a significant increase in bright-dark spacing.展开更多
The mode-2 internal solitary wave(ISW)propagating independently in the stratified ocean is a high-mode internal wave(IW),and its complex wave-flow field will cause the harm to the safe operation of marine engineering ...The mode-2 internal solitary wave(ISW)propagating independently in the stratified ocean is a high-mode internal wave(IW),and its complex wave-flow field will cause the harm to the safe operation of marine engineering structures.In this paper,a fluid environment with a continuous density pycnocline was prepared in a large experimental stratified fluid flume.Based on the principle of ISWs generated by the fluid gravity collapse,a physical experimental method for exciting the“oval”mode-2 ISW solitons by bidirectional fluid gravity collapse in a continuous density pycnocline was proposed.The experimental results showed that the evolution of the upper and lower double vortices near the center of pycnocline is a special generation mechanism of the generation process of mode-2 ISW generated by the gravity collapse of the stratified fluid.The number of generated mode-2 ISW internal solitons depends on the geometric size of fluid gravity collapse region and the geometric thickness ratio of the upper and lower layers of the fluid.The wave evolution process,wave-flow structure,wave-flow characteristics of the“oval”mode-2 ISW in the continuous density pycnocline and its stratified environment effect were obtained.The results showed that the wave speed of the mode-2 ISW increases with the increasing wave amplitude,and the wavelength increases first and then decreases with the increasing wave amplitude.Under the experimental conditions with same wave amplitude,the increase of the thickness ratio of the upper and lower layers of the fluid,the density difference and the thickness of the middle fluid layer would lead to the increase of the wavelength and wave speed of the mode-2 ISW.The velocity range of the mode-2 ISW is positively correlated with the wave amplitude.The increase of the thickness ratio of the upper and lower fluid layers,the density difference and the thickness of the middle fluid layer will lead to the enhancement of the horizontal and vertical flow field of the mode-2 ISW.展开更多
针对燃煤电厂参与调峰负荷波动较大,出口SO_(2)浓度控制效果不佳的问题,建立了一种基于捕鱼优化算法(catch fish optimization algorithm,CFOA)优化融合神经网络的出口SO_(2)浓度预测模型。首先使用互信息算法筛选由机理分析得到的特征...针对燃煤电厂参与调峰负荷波动较大,出口SO_(2)浓度控制效果不佳的问题,建立了一种基于捕鱼优化算法(catch fish optimization algorithm,CFOA)优化融合神经网络的出口SO_(2)浓度预测模型。首先使用互信息算法筛选由机理分析得到的特征变量,并通过逐次变分模态分解对筛选后的辅助变量进行分解重构,保留相关性较大的重构分量作为输入变量。随后采用双向时间卷积网络、双向门控循环单元与多头自注意力机制构建融合神经网络模型,通过CFOA对模型超参数寻优以进一步提高精度。最后使用某660 MW燃煤电厂历史运行数据进行对比实验,实验结果表明,该模型在出口SO_(2)浓度剧烈波动的工况下仍能实现较好的预测效果。同多种模型对比,该模型具有更小的误差和更高的预测精度,体现出其在复杂变化环境中的鲁棒性和可靠性。展开更多
目的探讨二甲双胍联合不同方式运动治疗2型糖尿病(T2DM)的临床疗效。方法选择2020年5月至2021年1月新乡市第一人民医院收治的90例T2DM患者为研究对象。根据治疗方案将患者分为对照组、观察组1和观察组2,每组30例。3组患者均给予二甲双...目的探讨二甲双胍联合不同方式运动治疗2型糖尿病(T2DM)的临床疗效。方法选择2020年5月至2021年1月新乡市第一人民医院收治的90例T2DM患者为研究对象。根据治疗方案将患者分为对照组、观察组1和观察组2,每组30例。3组患者均给予二甲双胍进行降糖治疗和个体化糖尿病食谱干预。在此基础上,对照组患者给予常规生活方式指导(糖尿病膳食指导及个体化运动方式指导,建议患者每周至少进行150 min中等强度运动),观察组1患者根据微信群督导信息进行每日2~3次餐后有氧或低强度抗阻运动或有氧加抗阻运动,观察组2患者根据微信群督导信息每日进行餐后1次有氧运动或有氧加低强度抗阻运动(弹力带联合快步走),共干预治疗6个月。分别于治疗前及治疗3、6个月时采集3组患者肘静脉血,分离血清,应用全自动生化分析仪检测3组患者空腹血糖(FBG)、餐后2 h血糖(2 h PG)、三酰甘油(TG)、总胆固醇(TCH)、高密度脂蛋白(HDL)、低密度脂蛋白(LDL)、同型半胱氨酸(HCY)水平;应用全自动特定蛋白即时分析仪检测3组患者糖化血红蛋白(HbA1c)水平;采用电化学发光免疫分析法检测3组患者血清25-羟基维生素D[25(OH)D]水平。结果治疗前3组患者的FBG、2 h PG、HbA1c、25(OH)D、TCH、TG、HDL、LDL、HCY水平比较差异均无统计学意义(P>0.05)。对照组患者各时间点的FBG、2hPG、TG、TCH、HDL、LDL、HCY与治疗前比较差异无统计学意义(P>0.05);对照组患者治疗3、6个月时HbA1c水平显著低于治疗前(P<0.05),25(OH)D水平显著高于治疗前(P<0.05);对照组患者治疗6个月时的HbA1c水平显著低于治疗3个月时(P<0.05)。观察组1和观察组2患者治疗3、6个月时的FBG、2 h PG、HbA1c、TCH、TG水平显著低于治疗前,25(OH)D、HDL水平显著高于治疗前(P<0.05);2组患者各时间点LDL、HCY水平比较差异均无统计学意义(P>0.05)。观察组1治疗6个月时的HbA1c水平显著低于治疗3个月时,25(OH)D水平显著高于治疗3个月时(P<0.01);观察组1患者治疗6个月时与治疗3个月时的FBG、2 h PG、TCH、TG、HDL水平比较差异无统计学意义(P>0.05)。观察组2患者治疗6个月时的FBG、HbA1c水平显著低于治疗3个月时,25(OH)D水平显著高于治疗3个月时(P<0.01);观察组2患者治疗6个月时与治疗3个月时的2 h PG、TCH、TG、HDL水平比较差异无统计学意义(P>0.05)。治疗3、6个月时,观察组1和观察组2患者的FBG、2 h PG、HbA1c水平显著低于对照组,25(OH)D水平显著高于对照组(P<0.05);观察组1与观察组2患者的FBG、2 h PG、HbA1c水平比较差异无统计学意义(P>0.05);观察组2患者的25(OH)D水平显著高于观察组1(P<0.05);观察组1患者的TCH水平显著低于对照组(P<0.05);观察组2与对照组患者的TCH水平比较差异无统计学意义(P>0.05);观察组2患者的TCH水平显著高于观察组1(P<0.05);3组患者的HDL、LDL、HCY水平比较差异无统计学意义(P>0.05)。治疗3个月时,3组患者的TG水平比较差异无统计学意义(P>0.05);治疗6个月时,观察组1和观察组2患者的TG水平与对照组比较差异无统计学意义(P>0.05);观察组2患者的TG水平显著高于观察组1(P<0.05)。结论在糖尿病饮食和降糖药物治疗的基础上,联合不同运动方式均可改善T2DM患者的血糖、HbA1c、血清25(OH)D等水平,通过微信群督导患者在餐后30~60 min采用不同方式在不同时段进行不同强度的运动的改善效果优于未进行督导的患者。展开更多
基金The National Science and Technology Major Project under contract No.2016ZX05057015the National Natural Science Foundation of China(NSFC)under contract Nos 41376038+6 种基金4040600941806123 and 41506038the NSFC-Shandong Joint Fund for Marine Science Research Centers under contract No.U1606405the National Program on Global Change and Air-Sea Interaction under contract Nos GASI-03-01-01-02GASI-02-IND-STSsum and GASI-IPOVAI-01-05the Public Science and Technology Research Funds Projects of Ocean under contract No.200905024the National Key Scientific Instrument and Equipment Development Projects under contract No.2012YQ12003908。
文摘The mode-2 internal solitary waves(ISWs)generated by mode-2 internal tide(IT)are identified by mooring observations in the northern South China Sea(SCS)from 2016 to 2017.Two mode-2 ISWs with a re-appearance period of 24.9 h observed on 29 and 30 July 2016 are characterized by type-b ISWs.They occurred when the isotherms compressed obviously in the vertical direction.Modal decomposition of IT horizontal currents shows that the vertical compression of the isotherms is mainly caused by diurnal mode-2 IT.The analysis of the role of the density stratification reveals that a deeper and thinner pycnocline is favorable for generation of mode-2 ISWs rather than pycnocline intensity.By comparing the mode-2 nonlinear,dispersion coefficients and the Ursell numbers calculated based on the stratification associated with different kinds of ITs with the observation results,it is shown that the diurnal mode-2 IT plays a crucial role in the generation of the mode-2 ISWs.When the diurnal mode-2 IT interacts with the semidiurnal IT and causes a deeper and thinner pycnocline,the mode-2 ISWs are easily excited.
基金The National Natural Science Foundation of China under contract No.61871353。
文摘A series of experiments are designed to propose a new method to study the characteristics of convex mode-2internal solitary waves(ISWs)in optical remote sensing images using a laboratory-based optical remote sensing simulation platform.The corresponding wave parameters of large-amplitude convex mode-2 ISWs under smooth surfaces are investigated along with the optical remote sensing characteristic parameters.The mode-2 ISWs in the experimentally obtained optical remote sensing image are produced by their overall modulation effect on the water surface,and the extreme points of the gray value of the profile curve of bright-dark stripes appear at the same location as the real optical remote sensing image.The present data extend to a larger range than previous studies,and for the characteristics of large amplitude convex mode-2 ISWs,the experimental results show a second-order dependence of wavelength on amplitude.There is a close relationship between optical remote sensing characteristic parameters and wave parameters of mode-2 ISWs,in which there is a positive linear relationship between the bright-dark spacing and wavelength and a nonlinear relationship with the amplitude,especially when the amplitude is very large,there is a significant increase in bright-dark spacing.
基金supported by the National Natural Science Foundation of China(Grant No.12472247)supported by the Natural Science Foundation of Hunan Province(Grant No.2025JJ60027)+1 种基金the Innovation Research Foundation of National University of Defense Technology(Grant No.ZK24-51)the Science and Technology Innovation Program of Hunan Province(Grant No.2023RC3005).
文摘The mode-2 internal solitary wave(ISW)propagating independently in the stratified ocean is a high-mode internal wave(IW),and its complex wave-flow field will cause the harm to the safe operation of marine engineering structures.In this paper,a fluid environment with a continuous density pycnocline was prepared in a large experimental stratified fluid flume.Based on the principle of ISWs generated by the fluid gravity collapse,a physical experimental method for exciting the“oval”mode-2 ISW solitons by bidirectional fluid gravity collapse in a continuous density pycnocline was proposed.The experimental results showed that the evolution of the upper and lower double vortices near the center of pycnocline is a special generation mechanism of the generation process of mode-2 ISW generated by the gravity collapse of the stratified fluid.The number of generated mode-2 ISW internal solitons depends on the geometric size of fluid gravity collapse region and the geometric thickness ratio of the upper and lower layers of the fluid.The wave evolution process,wave-flow structure,wave-flow characteristics of the“oval”mode-2 ISW in the continuous density pycnocline and its stratified environment effect were obtained.The results showed that the wave speed of the mode-2 ISW increases with the increasing wave amplitude,and the wavelength increases first and then decreases with the increasing wave amplitude.Under the experimental conditions with same wave amplitude,the increase of the thickness ratio of the upper and lower layers of the fluid,the density difference and the thickness of the middle fluid layer would lead to the increase of the wavelength and wave speed of the mode-2 ISW.The velocity range of the mode-2 ISW is positively correlated with the wave amplitude.The increase of the thickness ratio of the upper and lower fluid layers,the density difference and the thickness of the middle fluid layer will lead to the enhancement of the horizontal and vertical flow field of the mode-2 ISW.
文摘针对燃煤电厂参与调峰负荷波动较大,出口SO_(2)浓度控制效果不佳的问题,建立了一种基于捕鱼优化算法(catch fish optimization algorithm,CFOA)优化融合神经网络的出口SO_(2)浓度预测模型。首先使用互信息算法筛选由机理分析得到的特征变量,并通过逐次变分模态分解对筛选后的辅助变量进行分解重构,保留相关性较大的重构分量作为输入变量。随后采用双向时间卷积网络、双向门控循环单元与多头自注意力机制构建融合神经网络模型,通过CFOA对模型超参数寻优以进一步提高精度。最后使用某660 MW燃煤电厂历史运行数据进行对比实验,实验结果表明,该模型在出口SO_(2)浓度剧烈波动的工况下仍能实现较好的预测效果。同多种模型对比,该模型具有更小的误差和更高的预测精度,体现出其在复杂变化环境中的鲁棒性和可靠性。
文摘目的探讨二甲双胍联合不同方式运动治疗2型糖尿病(T2DM)的临床疗效。方法选择2020年5月至2021年1月新乡市第一人民医院收治的90例T2DM患者为研究对象。根据治疗方案将患者分为对照组、观察组1和观察组2,每组30例。3组患者均给予二甲双胍进行降糖治疗和个体化糖尿病食谱干预。在此基础上,对照组患者给予常规生活方式指导(糖尿病膳食指导及个体化运动方式指导,建议患者每周至少进行150 min中等强度运动),观察组1患者根据微信群督导信息进行每日2~3次餐后有氧或低强度抗阻运动或有氧加抗阻运动,观察组2患者根据微信群督导信息每日进行餐后1次有氧运动或有氧加低强度抗阻运动(弹力带联合快步走),共干预治疗6个月。分别于治疗前及治疗3、6个月时采集3组患者肘静脉血,分离血清,应用全自动生化分析仪检测3组患者空腹血糖(FBG)、餐后2 h血糖(2 h PG)、三酰甘油(TG)、总胆固醇(TCH)、高密度脂蛋白(HDL)、低密度脂蛋白(LDL)、同型半胱氨酸(HCY)水平;应用全自动特定蛋白即时分析仪检测3组患者糖化血红蛋白(HbA1c)水平;采用电化学发光免疫分析法检测3组患者血清25-羟基维生素D[25(OH)D]水平。结果治疗前3组患者的FBG、2 h PG、HbA1c、25(OH)D、TCH、TG、HDL、LDL、HCY水平比较差异均无统计学意义(P>0.05)。对照组患者各时间点的FBG、2hPG、TG、TCH、HDL、LDL、HCY与治疗前比较差异无统计学意义(P>0.05);对照组患者治疗3、6个月时HbA1c水平显著低于治疗前(P<0.05),25(OH)D水平显著高于治疗前(P<0.05);对照组患者治疗6个月时的HbA1c水平显著低于治疗3个月时(P<0.05)。观察组1和观察组2患者治疗3、6个月时的FBG、2 h PG、HbA1c、TCH、TG水平显著低于治疗前,25(OH)D、HDL水平显著高于治疗前(P<0.05);2组患者各时间点LDL、HCY水平比较差异均无统计学意义(P>0.05)。观察组1治疗6个月时的HbA1c水平显著低于治疗3个月时,25(OH)D水平显著高于治疗3个月时(P<0.01);观察组1患者治疗6个月时与治疗3个月时的FBG、2 h PG、TCH、TG、HDL水平比较差异无统计学意义(P>0.05)。观察组2患者治疗6个月时的FBG、HbA1c水平显著低于治疗3个月时,25(OH)D水平显著高于治疗3个月时(P<0.01);观察组2患者治疗6个月时与治疗3个月时的2 h PG、TCH、TG、HDL水平比较差异无统计学意义(P>0.05)。治疗3、6个月时,观察组1和观察组2患者的FBG、2 h PG、HbA1c水平显著低于对照组,25(OH)D水平显著高于对照组(P<0.05);观察组1与观察组2患者的FBG、2 h PG、HbA1c水平比较差异无统计学意义(P>0.05);观察组2患者的25(OH)D水平显著高于观察组1(P<0.05);观察组1患者的TCH水平显著低于对照组(P<0.05);观察组2与对照组患者的TCH水平比较差异无统计学意义(P>0.05);观察组2患者的TCH水平显著高于观察组1(P<0.05);3组患者的HDL、LDL、HCY水平比较差异无统计学意义(P>0.05)。治疗3个月时,3组患者的TG水平比较差异无统计学意义(P>0.05);治疗6个月时,观察组1和观察组2患者的TG水平与对照组比较差异无统计学意义(P>0.05);观察组2患者的TG水平显著高于观察组1(P<0.05)。结论在糖尿病饮食和降糖药物治疗的基础上,联合不同运动方式均可改善T2DM患者的血糖、HbA1c、血清25(OH)D等水平,通过微信群督导患者在餐后30~60 min采用不同方式在不同时段进行不同强度的运动的改善效果优于未进行督导的患者。
