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Wind power forecasting based on improved variational mode decomposition and permutation entropy

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Clean Energy 2023年第5期7卷 1032-1045页

作者： Zhijian Qu Xinxing Hou Wenbo Hu Rentao Yang chao ju State Key Laboratory of Performance Monitoring Protecting of Rail Transit Infrastructure East China Jiaotong University330013JiangxiChina College of Electrical and Automation Engineering East China Jiaotong University330013JiangxiChina

Due to the significant intermittent,stochastic and non-stationary nature of wind power generation,it is difficult to achieve the desired prediction ***,a wind power prediction method based on improved variational modal decomposition with permutation entropy is ***,based on the meteorological data of wind farms,the Spearman correlation coefficient method is used to filter the meteorological data that are strongly correlated with the wind power to establish the wind power prediction model data set;then the original wind power is decomposed using the improved variational modal decomposition technique to eliminate the noise in the data,and the decomposed wind power is reconstructed into a new subsequence by using the permutation entropy;with the meteorological data and the new subsequence as input variables,a stacking deeply integrated prediction model is developed;and finally the prediction results are obtained by optimizing the hyperparameters of the model algorithm through a genetic *** validity of the model is verified using a real data set from a wind farm in north-west *** results show that the mean absolute error,root mean square error and mean absolute percentage error are improved by at least 33.1%,56.1%and 54.2%compared with the autoregressive integrated moving average model,the support vector machine,long short-term memory,extreme gradient enhancement and convolutional neural networks and long short-term memory models,indicating that the method has higher prediction accuracy.

关键词： wind power prediction improved variational mode decomposition permutation entropy stacking deep learning

Effects of C/N ratio on nitrate removal and floc morphology of autohydrogenotrophic bacteria in a nitrate-containing wastewater treatment process

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Journal of Environmental Sciences 2018年第7期30卷 52-60页

作者： Tran Ngoc Phu Nguyen Shu-ju chao Pei-Chung Chen Chihpin Huang Institute of EnvironmentaZ Engineering National Chiao Tung University Hsinchu 300 Chinese Taipei

The effects of C/N ratio of a nitrate-containing wastewater on nitrate removal performed by autohydrogenotrophic bacteria as well as on the morphological parameters of floc such as floc morphology, floc number distribution, mean particle size（MPS）, aspect ratio and transparency were examined in this study. The results showed that the nitrate reduction rate increased with increasing C/N ratio from 0.5 to 10 and that the nitrogen removal of up to 95% was found at the C/N ratios of higher than 5（between 0.5–10）. Besides, high C/N ratio values reflected a corresponding high nitrite accumulation after 12-hr operation, and a fast decreasing rate of nitrite in the rest of operational time. The final p H values increased with the C/N ratio increasing from 0.5 to 2.5, but decreased with the C/N ratio increasing from2.5 to 10. There were no significant changes in floc morphology with the MPSs ranging from35 to 40 μm. Small and medium-sized flocs were dominant in the sludge suspension, and the number of flocs increased with the increasing C/N ratios. Furthermore, the highest apparent frequency of 10% was observed at aspect ratios of 0.5 and 0.6, while the transparency of flocs changed from 0.1 to 0.7.

关键词： Autohydrogenotrophic bacteria C/N ratio Floc morphology Nitrate reduction Nitrite accumulation Nitrogen removal

Recent Progress in Raman and Optical Property Study of Carbon Nanotues

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Recent Progress in Raman and Optical Property Study of Carbo...

第十三届全国光散射学术会议

作者： Er-jun Liang Hua-Yang Li Kun Liu Ming-ju chao Key Laboratory of Materials Physics of State Education Commission and Key Laboratory of Materials Physics of Henan ProvinceZhengzhou University

＜正＞The electronic properties of SWNTs and specifically of semiconducting SWNTs offer great promise as a compact,easy-to-integrate nanoscale source of photons,such as light-emitting-and photo-sensitive diodes,nonlinear optical-or light harvesting materials and more for future photonic and optoelectronic *** development of techniques for the separation of SWNTs from nanotube-ropes provides the

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拉缘蝽为害对卵叶小蜡内含物含量的影响

福建林业科技 2006年第3期33卷 60-64页

作者：张潮巨福建省光泽华桥国有林场福建光泽354103

通过对受拉缘蝽不同程度为害的卵叶小蜡叶片的单宁、黄酮、总酚含量的测定,结果表明:受害的卵叶小蜡叶片的单宁含量随着拉缘蝽若、成虫为害程度的加重而发生变化,在受害初期显著增加,但随着为害程度的加重,而呈逐渐下降的趋势;受害卵叶... 详细信息

通过对受拉缘蝽不同程度为害的卵叶小蜡叶片的单宁、黄酮、总酚含量的测定,结果表明:受害的卵叶小蜡叶片的单宁含量随着拉缘蝽若、成虫为害程度的加重而发生变化,在受害初期显著增加,但随着为害程度的加重,而呈逐渐下降的趋势;受害卵叶小蜡叶片中黄酮含量随着受害程度的加剧,呈先上升、而后再下降的特点;叶部总酚的含量随着受害程度的不断加重,总酚的含量呈现上升的趋势。说明卵叶小蜡应激反应的过程是一种随着受害程度的不同而不断变化的动态过程。

关键词：拉缘蝽卵叶小蜡单宁黄酮总酚

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高等院校资助学生制度的构建与完善

教育理论与实践 2018年第12期38卷 17-19页

作者：巢居鹏广东农工商职业技术学院广东广州510507

当前,国家和社会各界对贫困生给予高度重视,出台一系列政策和制度。这些制度在实行过程中呈现出相当多的问题,主要有资助资源短缺、划定贫困标准的认定机制不够完备、资助资源分配管理不均衡,以及对受助者的需求关注不足而使资助不能发... 详细信息

当前,国家和社会各界对贫困生给予高度重视,出台一系列政策和制度。这些制度在实行过程中呈现出相当多的问题,主要有资助资源短缺、划定贫困标准的认定机制不够完备、资助资源分配管理不均衡,以及对受助者的需求关注不足而使资助不能发挥其应有作用等诸多问题。进一步完善和发展高等院校资助学生制度势在必行。学校要通过建立更为科学规范的资助体系,拓展并丰富资助渠道,注重对贫困学生的关怀及诚信感恩教育等,使资助制度真正解决贫困学生问题,将资助工作真正落到实处,在全社会形成良好的助学氛围。

关键词：高等院校资助学生制度贫困学生资助体系

Diabetes onset at an earlier age and high HbA1c levels as risk factors of diabetic retinopathy

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International Journal of Ophthalmology(English edition) 2021年第2期14卷 269-276页

作者： Rui-Fang Feng Hai-Yang Liu Ya-Lu Liu Qing Xu Lei Qiao chao-ju Gong Yi-Peng Zhang Jie Li Li-Na Guan Wei Fan Mei-Li Li Wen-Jin Li Su-Yan Li Department of Ophthalmology the Affiliated Xuzhou Municipal Hospital of Xuzhou Medical UniversityXuzhou First People’s HospitalXuzhou Eye Disease Prevention and Treatment InstituteXuzhou 221116Jiangsu ProvinceChina

AIM:To assess the effect of age at diabetes onset and uncontrollable high Hb A1 c levels on the development of diabetic retinopathy(DR)among Chinese type 2 diabetes mellitus(DM)***:This was a cross-sectional survey of diabetic patients in Subei district,*** covering physical measurements,fasting blood-glucose(FBG),glycosylated hemoglobin(Hb A1 c),blood lipid,urinary albumin/creatinine ratio(UACR),ocular fundus examination,and diabetes treatment records were *** independent sample t-test were used to analyze differences.A Logistic regression analysis was applied to study the independent risk factors of ***:A total of 1282 patients with type 2 DM were enrolled,and 191 cases had DR(14.9%).The age at diabetes onset,education level,alcohol consumption,Hb A1 c level,UACR level,and hypoglycemic drugs were independent influencing factors for *** older the onset of diabetes,the less likely to develop DR(OR:0.958,95%CI:0.942-0.975,P=0.000).Patients were then divided in terms of age at diabetes onset as follows:<50 y,50-59 y,60-69 y,and≥70 *** with diabetes onset age<50 y,50-59 y(OR:0.463,95%CI:0.306-0.699,P=0.000),60-69 y(OR:0.329,95%CI:0.203-0.535,P=0.000)and≥70 y(OR:0.232,95%CI:0.094-0.577,P=0.002)were at a lower risk of *** prevalence of DR was highest in patients with diabetes onset age<50 y(29.5%,P<0.05).The Hb A1 c level(8.67±1.97)%and proportion of insulin injection(52.5%)in patients with diabetes onset<40 y were higher than in patients with older diabetes onset age(P<0.05).CONCLUSION:Diabetes onset at an earlier age and uncontrollable high Hb A1 c level could be independent risk factors for DR.

关键词： diabetic retinopathy age diabetes mellitus risk factors HbA1c

The effect of childbirth on carcinogenesis of DMBA-induced breast cancer in female SD rats

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Chinese Journal of Cancer 2011年第11期30卷 779-785页

作者： Ji-An Zhao Jin-jun Chen Ying-chao ju Jian-Hua Wu Cui-Zhi Geng Hui-Chai Yang Department of Hepatobiliary Surgery The First Affil- iated Hospital Hebei Medical University Shijiazhuang Hebei 050013 P. R. China Experimental Animal Center The Fourth Affiliated Hospital Hebei Medical University Shijiazhuang Hebei 050011 P. R. China. Department of Breast Clinics Center The Fourth Affiliated Hospital Hebei Medical University Shijiazhuang Hebei 050011 P. R. China. Department of Pathology The Fourth Affiliated Hospital Hebei Medical University Shijiazhuang Hebei 050011 P. R. China.

Many epidemiologic and clinical studies have indicated that the frequency of breast cancer was lower in parous women than in nulliparous women. Moreover, the incidence of breast cancer has been reported to be lower in women with early childbirth than in women with late childbirth. To verify the effect of childbirth and the age at first childbirth on carcinogenesis and progression of breast cancer, we induced breast cancer by 7,12-dimethylbenanthracene (DMBA) in 120 female Sprague-Dawley (SD) rats, and divided them into control or experimental (DMBA-treated) nulliparous, early childbirth, and late childbirth groups to observe the incidence, latency, and size of breast cancer. Argyrophilic nucleolar organizer regions (AgNOR) count and the expression of C-erbB-2, proliferating cell nuclear antigen (PCNA), Ki-67, and minichromosome maintenance protein 2 (MCM2) in breast cancer tissues were detected by immunohistochemistry. The breast cancer incidences were 95.0%, 16.7%, and 58.8% in the experimental nulliparous, early childbirth, and late childbirth groups, respectively (all P < 0.05). Between any two of these groups, the latency was significantly different, but tumor size was similar. AgNOR count and the expression of C-erbB-2, PCNA, Ki-67, and MCM2 were significantly higher in the experimental nulliparous group than in the experimental early or late childbirth groups (P < 0.05), but no significant differences were observed between the latter two groups. Taken together, the results suggest that childbirth, especially early childbirth, can reduce the incidence and postpone the onset of DMBA-induced breast cancer.

关键词： SD大鼠乳腺癌分娩雌性诱发增殖细胞核抗原 AgNOR 免疫组化检测

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右大腿股外侧肌颗粒细胞瘤一例

磁共振成像 2022年第2期13卷 103-104页

作者：琚超王红新疆医科大学第二附属医院影像科乌鲁木齐830011

本文为回顾性研究,符合我国医学伦理的相关规定,符合2013年版赫尔辛基宣言。患者女,52岁,汉族,自诉4个月前发现右下肢肿物,伴阵发性锐痛,持续数秒,生长缓慢,于2021年6月1日就诊于新疆医科大学第二附属医院。专科检查:患者右下肢可见大小... 详细信息

本文为回顾性研究,符合我国医学伦理的相关规定,符合2013年版赫尔辛基宣言。患者女,52岁,汉族,自诉4个月前发现右下肢肿物,伴阵发性锐痛,持续数秒,生长缓慢,于2021年6月1日就诊于新疆医科大学第二附属医院。专科检查:患者右下肢可见大小约2 cm×3 cm突起物,触之质硬,活动度可,界限明显。实验室检查:C-反应蛋白73.72 mg/L。既往史:20年前,于地方医院诊断为"抑郁症",现口服氯氮平。

关键词：颗粒细胞瘤股外侧肌大腿磁共振成像

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一种高超声速飞行器鲁棒自适应控制方法

宇航学报 2017年第10期38卷 1088-1096页

作者：余朝军江驹肖东郑亚龙南京航空航天大学自动化学院南京211106

针对较强参数摄动情况下高超声速飞行器巡航段控制问题,提出一种基于主影响元素分析的鲁棒自适应控制方法。首先在飞行器具有未知参数情况下,使用符号计算工具对系统不确定量进行分离,实现不确定性的建模;进一步使用蒙特卡洛试验方法,... 详细信息

针对较强参数摄动情况下高超声速飞行器巡航段控制问题,提出一种基于主影响元素分析的鲁棒自适应控制方法。首先在飞行器具有未知参数情况下,使用符号计算工具对系统不确定量进行分离,实现不确定性的建模;进一步使用蒙特卡洛试验方法,确定不确定函数向量的主影响元素,对模型进行简化。然后在滑模控制的基础上,结合参数自适应估值和鲁棒补偿的方法,设计出飞行控制器,实现对未知参数的自适应估值以及对模型误差的补偿,并从理论上证明了系统的稳定性。仿真试验表明,在较大参数摄动情况下,文中所提方法依然可以保证系统的稳定性和跟踪性能。

关键词：高超声速飞行器不确定性建模主影响元素分析鲁棒自适应控制