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
Guided elastic waves have a great potential in pipe inspection as an efficient and low-cost nondestructive evaluation （NDE） technique, among which the wave of mode L（0, 2） receives a lot of attention because this ...Guided elastic waves have a great potential in pipe inspection as an efficient and low-cost nondestructive evaluation （NDE） technique, among which the wave of mode L（0, 2） receives a lot of attention because this mode is the fastest mode in a weakly dispersive region of frequency to minimize dispersion effects over a long distance and sensitive to the defects distributed circumferentially. Though many experimental and numerical researches have already been carried out about the excitation of L（0, 2） and its interaction with the defect in a hollow cylinder, its excitation mechanism has not been clarified yet. In this paper based on the transient response solution of the hollow cylinder, derived by the method of eigenfunction expansion, the theory about the exciting mechanism of mode L（0, 2） is advanced and the effects of the spatial distribution, vibration frequency and direction of the external force on the excitation are discussed. And the pure mode L（0, 2） is excited successfully under the parameters obtained through theoretical analysis. Furthermore, its interactions with some kinds of defects in hollow cylinders are simulated with the method of finite element analysis （FEA） and the results agree well with those obtained by other researchers.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
Multiple broadband Alfvenic chirping modes(CMs),with frequencies in the wide range of f-35-150 kHz and chirping down rapidly,are found in HL-2A neutral beam injection plasmas,and the CMs can even coexist.The frequency...Multiple broadband Alfvenic chirping modes(CMs),with frequencies in the wide range of f-35-150 kHz and chirping down rapidly,are found in HL-2A neutral beam injection plasmas,and the CMs can even coexist.The frequency chirping down process can be completed within-1 ms,and the frequency shift can reach 30-50 kHz.The CMs propagate in ion diamagnetic drift directions poloidally.The toroidal mode number is confirmed to be n=1,2,3 and 4 for the f-35-65,55-90,70-120 and 100-150 kHz CMs,respectively.The CMs are more like to be energetic-particle continuum modes(EPMs),since the modes almost locate on the Alfven continuum.展开更多
A new copper（Ⅱ） compound with imino nitroxide radicals [Cu（IM-MeImz）2].（SCN）2 （IM-meImz =2-（5-methylimidazol-4-yl）-4,4,5,5-tetramethyl-2-imidazoline- 1-oxyl） has been synthesized and characterized structura...A new copper（Ⅱ） compound with imino nitroxide radicals [Cu（IM-MeImz）2].（SCN）2 （IM-meImz =2-（5-methylimidazol-4-yl）-4,4,5,5-tetramethyl-2-imidazoline- 1-oxyl） has been synthesized and characterized structurally and magnetically. It crystallizes in monoclinic, space group P21/c with a = 9.3604（7）, b = 10.3012（7）, c = 16.6684（12）A, β = 105.0290（10）^o, V = 1552.25（19）A3, C24H34CUN10O2S2, Mr = 622.27, Z = 2, Dc = 1.331 g/cm^3,μ（MoKα） = 0.876 mm^-1, F（000） = 650, the final R = 0.0374 and wR = 0.1079. X-ray analysis demonstrates that the IM-MeImz ligand is coordinated to the copper（Ⅱ） ion as an unusual didentate chelate with a k-2 N（MeImz）,O（IM） mode in the complex. The square-planar coordination sites at Cu（Ⅱ） are occupied by two 0 and two N atoms from the imino nitroxide radicals. The complex molecules are connected as a onedimensional polymer structure by intermolecular interactions. Magnetic measurements show that there are intramolecular antiferromagnetic interactions between the Cu（Ⅱ） ion and radicals.展开更多
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Guided elastic waves have a great potential in pipe inspection as an efficient and low-cost nondestructive evaluation （NDE） technique, among which the wave of mode L（0, 2） receives a lot of attention because this mode is the fastest mode in a weakly dispersive region of frequency to minimize dispersion effects over a long distance and sensitive to the defects distributed circumferentially. Though many experimental and numerical researches have already been carried out about the excitation of L（0, 2） and its interaction with the defect in a hollow cylinder, its excitation mechanism has not been clarified yet. In this paper based on the transient response solution of the hollow cylinder, derived by the method of eigenfunction expansion, the theory about the exciting mechanism of mode L（0, 2） is advanced and the effects of the spatial distribution, vibration frequency and direction of the external force on the excitation are discussed. And the pure mode L（0, 2） is excited successfully under the parameters obtained through theoretical analysis. Furthermore, its interactions with some kinds of defects in hollow cylinders are simulated with the method of finite element analysis （FEA） and the results agree well with those obtained by other researchers.
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。
基金Supported by the National Key R&D Program of China (Grant Nos.2018YFE0304102,2019YFE03020000 and 2017YFE0301202)the National Natural Science Foundation of China (Grant Nos.11875024,11875021,11835010 and 12005054)the Sichuan Provincial Science and Technology Project (Grant Nos.2020YFSY0047 and 2020JDJQ0070)。
文摘Multiple broadband Alfvenic chirping modes(CMs),with frequencies in the wide range of f-35-150 kHz and chirping down rapidly,are found in HL-2A neutral beam injection plasmas,and the CMs can even coexist.The frequency chirping down process can be completed within-1 ms,and the frequency shift can reach 30-50 kHz.The CMs propagate in ion diamagnetic drift directions poloidally.The toroidal mode number is confirmed to be n=1,2,3 and 4 for the f-35-65,55-90,70-120 and 100-150 kHz CMs,respectively.The CMs are more like to be energetic-particle continuum modes(EPMs),since the modes almost locate on the Alfven continuum.
基金This work was supported by the N N S F of China (No. 20471026)the Natural Science Foundation of Henan Province (No. 0311021200)
文摘A new copper（Ⅱ） compound with imino nitroxide radicals [Cu（IM-MeImz）2].（SCN）2 （IM-meImz =2-（5-methylimidazol-4-yl）-4,4,5,5-tetramethyl-2-imidazoline- 1-oxyl） has been synthesized and characterized structurally and magnetically. It crystallizes in monoclinic, space group P21/c with a = 9.3604（7）, b = 10.3012（7）, c = 16.6684（12）A, β = 105.0290（10）^o, V = 1552.25（19）A3, C24H34CUN10O2S2, Mr = 622.27, Z = 2, Dc = 1.331 g/cm^3,μ（MoKα） = 0.876 mm^-1, F（000） = 650, the final R = 0.0374 and wR = 0.1079. X-ray analysis demonstrates that the IM-MeImz ligand is coordinated to the copper（Ⅱ） ion as an unusual didentate chelate with a k-2 N（MeImz）,O（IM） mode in the complex. The square-planar coordination sites at Cu（Ⅱ） are occupied by two 0 and two N atoms from the imino nitroxide radicals. The complex molecules are connected as a onedimensional polymer structure by intermolecular interactions. Magnetic measurements show that there are intramolecular antiferromagnetic interactions between the Cu（Ⅱ） ion and radicals.
