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Effect of active control on optimal structures in wall turbulence

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Science China(Physics,Mechanics & Astronomy) 2013年第2期56卷 290-297页

作者： deng bingqing XU ChunXiao HUANG WeiXi CUI GuiXiang AML Department of Engineering MechanicsTsinghua University

The effect of active control imposed at the wall on optimal structures in wall turbulence is studied by using a linear transient growth *** the detection plane of the control is located in the buffer layer,the influence of the control on the transient growth of large scale motion becomes negligible as Reynolds number ***,if the control signal is detected at the plane located in the logarithm region,the transient growth at large scale can be greatly *** peak values of transient growth resulting from the strong blowing and suction on the wall *** study indicates that a proper selection of control imposed on the wall can suppress the large scale motion in the logarithmic region.

关键词： active control optimal structure wall turbulence

Coherent structures in wall turbulence and mechanism for drag reduction control

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Science China(Physics,Mechanics & Astronomy) 2013年第6期56卷 1053-1061页

作者： XU ChunXiao deng bingqing HUANG WeiXi CUI GuiXiang Department of Engineering Mechanics Tsinghua University

Herein is introduced the mechanism for active control influencing the generation of the near-wall streamwise vortices,which are closely related to the production of high skin friction in wall-bounded turbulent flows.A new opposition control scheme with adjusting control amplitude is proposed and evaluated in turbulent channel flow by direct numerical *** maximum drag reduction rate can be greatly enhanced by the strengthened *** the effectiveness of the control to the coherent structures at high Reynolds numbers is investigated by using a linear transient growth model.

关键词： wall turbulence coherent structure drag reduction active control

系统化疼痛护理干预在肝癌患者护理中的应用效果

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航空航天医学杂志 2024年第9期35卷 1114-1117页

作者：邓炳青尹晓婷曾显文惠州市中心人民医院 516000

目的系统化疼痛护理干预在肝癌患者的护理效果分析。方法回顾性分析,纳入2020年01月至2022年01月医院诊治80例肝癌患者病历资料,依据不同护理方式分为对照组38例、观察组42例。对照组采用常规护理,观察组则在其基础上予以系统化疼痛护... 详细信息

目的系统化疼痛护理干预在肝癌患者的护理效果分析。方法回顾性分析,纳入2020年01月至2022年01月医院诊治80例肝癌患者病历资料,依据不同护理方式分为对照组38例、观察组42例。对照组采用常规护理,观察组则在其基础上予以系统化疼痛护理,均护理1个月。比较2组的疼痛缓解效果、疼痛程度及生活质量。结果护理后,观察组的疼痛缓解有效率为92.86%,高于对照组的76.32%(P<0.05);2组患者的疼痛程度均有明显改善,其中观察组的疼痛程度等级:0级、1级、2级、3级分别对应15例、18例、7例、2例,优于对照组的5例、10例、13例、10例(P<0.05);2组患者生活质量皆有提升,其中观察组的认知、情绪、躯体功能、精神状况、总体健康评分分别为64.64±2.03分、66.23±2.16分、67.32±1.56分、68.49±2.01分、67.47±1.03分,均高于对照组的51.34±2.19分、54.29±2.61分、57.47±1.76分、58.43±1.38分、59.63±1.44分(P<0.05)。结论对肝癌患者进行系统化疼痛护理干预,可帮助患者缓解疼痛,改善生活质量。

关键词：系统化疼痛护理肝癌疼痛生活质量

细粒棘球蚴感染早期对小鼠肝脏NKT细胞及其相关因子的影响

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新疆医科大学学报 2024年第5期47卷 653-659页

作者：康雪娇邓冰清李寅时王慧张传山李静新疆医科大学基础医学院乌鲁木齐830054 新疆医科大学第一附属医院临床医学研究院省部共建中亚高发病成因与防治国家重点实验室乌鲁木齐830054 新疆地区高发疾病研究教育部重点实验室乌鲁木齐830054 新疆维吾尔自治区地方病分子生物学重点实验室乌鲁木齐830054

目的探讨细粒棘球蚴感染早期对小鼠肝脏自然杀伤T(Natural killer T,NKT)细胞及其相关因子的影响。方法将24只雌性C57BL/6小鼠随机分为对照组与感染组,每组12只。感染组经肝门静脉接种细粒棘球蚴原头蚴,对照组注射等量生理盐水,4周后,... 详细信息

目的探讨细粒棘球蚴感染早期对小鼠肝脏自然杀伤T(Natural killer T,NKT)细胞及其相关因子的影响。方法将24只雌性C57BL/6小鼠随机分为对照组与感染组,每组12只。感染组经肝门静脉接种细粒棘球蚴原头蚴,对照组注射等量生理盐水,4周后,每组各取6只小鼠的肝脏组织进行Masson染色,另外6只小鼠的肝脏组织用于分离淋巴细胞以进行流式细胞术检测小鼠肝脏不同NKT细胞亚群比例和相关细胞因子干扰素-γ(Interforn-γ,IFN-γ)、肿瘤坏死因子-α(Tumour necrosis factor-α,TNF-α)、白细胞介素-4(Interleukin-4,IL-4)、白细胞介素-10(Interleukin-10,IL-10)和白细胞介素-17A(Interleukin-17A,IL-17A)的表达。结果与对照组纤维占比比较,感染组肝脏侵袭部位及其邻近肝脏组织呈现结缔组织病变,纤维化明显,纤维占比显著增加,且分布较广,包绕肉芽肿四周形成条索状纤维间隔。与对照组比较,感染组小鼠肝脏NKT细胞比例和CD4^(+)NKT细胞比例显著降低,差异均有统计学意义(P均<0.01);与对照组比较,感染组小鼠肝脏NKT细胞分泌TNF-α的比例、CD4^(+)NKT细胞分泌TNF-α的比例显著升高,差异均有统计学意义(P<0.05)。结论细粒棘球蚴感染早期小鼠肝脏纤维化程度增加,肝脏NKT细胞及其亚群CD4^(+)NKT细胞产生TNF-α的水平增加,提示肝脏NKT细胞可能参与细粒棘球蚴感染早期肝脏免疫应答反应。

关键词：囊型包虫病细粒棘球蚴肝脏自然杀伤T细胞

超声心动图结合心电图在鉴别扩张性和缺血性心肌病中的应用

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影像科学与光化学 2019年第6期37卷 584-590页

作者：简雅婷胡剑邓冰晴恩施土家族苗族自治州中心医院超声诊断中心

本文对超声心动图(UCG)结合心电图(ECG)在鉴别扩张性心肌病(DCM)和缺血性心肌病(ICM)中的应用价值进行了分析。研究对象为回顾性选取2015年12月~2018年12月本院DCM组和ICM组患者各80例,两组均给予UCG和ECG检查并分析比较其表现。结果显... 详细信息

本文对超声心动图(UCG)结合心电图(ECG)在鉴别扩张性心肌病(DCM)和缺血性心肌病(ICM)中的应用价值进行了分析。研究对象为回顾性选取2015年12月~2018年12月本院DCM组和ICM组患者各80例,两组均给予UCG和ECG检查并分析比较其表现。结果显示,DCM组室壁节段性运动障碍、左室心尖圆而薄、左室圆拱门形、室壁矛盾运动发生率明显低于ICM组,DCM组弥漫性室壁运动障碍、左室球形发生率明显高于ICM组,差异有统计学意义(P0.05)。本文证实了UCG结合ECG监测可为鉴别DCM和ICM提供重要的参考依据,可作为鉴别DCM和ICM的重要手段。

关键词：超声心动图心电图鉴别扩张性心肌病缺血性心肌病

Deterministic and Robust Volt-var Control Methods of Power System Based on Convex Deep Learning

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 719-729页

作者： Qing Ma Changhong deng the School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

Volt-var control(VVC)is essentially a non-convex optimization problem due to the non-convexity of power flow(PF)constraints,resulting in the difficulty in obtaining the optimum without convexity *** existing second-order cone method for the convexity conversion often leads to a sharp increase in PF constraints and optimization variables,which in turn increases the optimization difficulty or even leads to optimization *** paper first proposes a deterministic VVC method based on convex deep learning power flow(DLPF).This method uses the input convex neural network(ICNN)to establish a single convex mapping between state parameters and node voltage to complete the convexity conversion while the optimization variables only correspond to reactive power equipment,which can ensure the global optimum with extremely fast computation *** cope with the impact brought by the uncertainty of distributed energy and omit the additional worst scenario search of traditional robust VVC,this paper proposes robust VVC method based on convex deep learning interval power flow(DLIPF),which continues to adopt ICNN to establish another convex mapping between state parameters and node voltage *** DLIPF with DLPF,this method decreases the modeling and optimization difficulty of robust VVC *** results on 30-bus,118-bus,and 200-bus systems prove the correctness and rapidity of the proposed methods.

关键词： Volt-var control convexity conversion convex deep learning power flow

Mathematical framework of nonlinear elastic waves propagating in pre-stressed media

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Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1705-1716页

作者： Jiangcheng CAI Mingxi deng College of Aerospace Engineering Chongqing University

Acoustic nonlinearity holds potential as a method for assessing material stress. Analogous to the acoustoelastic effect, where the velocity of elastic waves is influenced by third-order elastic constants, the propagation of nonlinear acoustic waves in pre-stressed materials would be influenced by higher-order elastic constants. Despite this,there has been a notable absence of research exploring this phenomenon. Consequently,this paper aims to establish a theoretical framework for governing the propagation of nonlinear acoustic waves in pre-stressed materials. It delves into the impact of pre-stress on higher-order material parameters, and specifically examines the propagation of onedimensional acoustic waves within the contexts of the uniaxial stress and the biaxial stress. This paper establishes a theoretical foundation for exploring the application of nonlinear ultrasonic techniques to measure pre-stress in materials.

关键词： 74J30 acoustoelastic effect higherorder elastic constant nonlinear elastic wave O343 pre-stress medium

Non-intrusive Load Monitoring Based on Graph Total Variation for Residential Appliances

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 947-957页

作者： Xiaoyang Ma Diwen Zheng Xiaoyong deng Ying Wang Dawei deng Wei Li the College of Electrical Engineering Sichuan UniversityChengdu 610065China State Grid Chongqing Electric Power Company Chongqing 400014China State Grid Sichuan Electric Power Company Chengdu 610095China State Grid Hubei Electric Power Company Limited Research Institute Wuhan 430077China

Non-intrusive load monitoring is a technique for monitoring the operating conditions of electrical appliances by collecting the aggregated electrical information at the household power *** several studies on the mining of unique load characteristics,few studies have extensively considered the high computational burden and sample *** on lowfrequency sampling data,a non-intrusive load monitoring algorithm utilizing the graph total variation(GTV)is proposed in this *** algorithm can effectively depict the load state without the need for prior ***,the combined Kmeans clustering algorithm and graph signals are used to build concise and accurate graph structures as load *** GTV representing the internal structure of the graph signal is introduced as the optimization model and solved using the augmented Lagrangian iterative *** introduction of the difference operator reduces the computing cost and addresses the inaccurate reconstruction of the graph *** low-frequency sampling data,the algorithm only requires a little prior data and no training,thereby reducing the computing *** conducted using the reference energy disaggregation dataset and almanac of minutely power dataset demonstrated the stable superiority of the algorithm and its low computational burden.

关键词： Non-intrusive load monitoring graph total variation augmented Lagrangian function smart grid

Scattering of Water Waves by Dual Symmetric Inclined Floating Porous Barriers Using the DBEM

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China Ocean Engineering 2024年第1期38卷 156-168页

作者： WANG Li-xian deng Yan-wen YE Yang-sha deng Zheng-zhi Key Laboratory of High Performance Ship Technology(Wuhan University of Technology) Ministry of EducationWuhan 430063China School of Naval Architecture Ocean and Energy Power EngineeringWuhan University of TechnologyWuhan 430063China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114China Institute of Port Coastal and Offshore EngineeringZhejiang UniversityZhoushan 316021China

The scattering of normally incident water waves by two surface-piercing inclined perforated barriers in water with a uniform finite depth is investigated within the framework of linear water wave *** that thin barriers are zero-thickness,a novel numerical method involving the the coupling of the dual boundary element method(DBEM)with damping layers is *** order to effectively damp out the reflected waves,two damping layers,instead of pseudoboundaries are implemented near the two side boundaries of the computational ***,the modified linearized free surface boundary conditions are formulated and used for solving both the ordinary boundary integral equation as well as the hypersingular boundary integral equation for degenerate *** newly developed numerical method is validated against analytical methods using the matched eigenfunction expansion method for the special case of two vertical barriers or the inclined angle to the vertical being *** influence of the length of the two damping layers has been ***,these findings are also validated against previous results for several *** validation,the numerical results for the reflection coefficient,transmission coefficient and dissipation coefficient are obtained by varying the inclination angle and porosity-effect *** effects of both the inclination angle and the porosity on the amplitudes of wave forces acting on both the front and rear barriers are also *** is found that the effect of the inclination angle mainly shifts the location of the extremal values of the reflection and the transmission ***,a moderate value of the porosity-parameter is quite effective at dissipating wave energy and mitigating the wave loads on dual barriers.

关键词： dual boundary element method inclined perforated floating breakwater reflection coefficient transmission coefficient damping layer