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Dynamic Couplingand Cooperative Control for Multi-paralleled Doubly Fed Induction Generator Wind Farms during Symmetrical Low Voltage Ride-through in a Weak Grid

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Protection and Control of Modern Power Systems 2024年第3期9卷 112-125页

作者： Lei guan Jun Yao the College of Electrical Engineering at Chongqing University ChongqingChina the State Key Laboratory of Power Transmission Equipment Technology School of Electrical EngineeringChongqing UniversityChongqing 400044China

In multi-fed grid-connected systems,there are complex dynamic interactions between different pieces of *** in situations of weak-grid faults,the dynamic coupling between equipment becomes more *** may cause the system to experience small-signal instability during the fault *** this paper,multi-paralleled doubly fed induction generator(DFIG)-based wind farms(WFs)are taken as an example to study the dynamic coupling within a multi-fed system during fault steady-state of symmetrical low voltage ride-through(LVRT)in a weak *** analysis reveals that the dynamic coupling between WFs will introduce a damping shift to each *** inevitably affects the system’s dynamic stability and brings the risk of small-signal instability during fault steady-state in LVRT *** the distance to fault location and fault severity will exacerbate the dynamic coupling between *** of the dynamic coupling,adjusting the control state of one WF will affect the stability of the remaining WFs in the ***,a cooperative control strategy for multi-paralleled DFIG WFs is proposed to improve dynamic stability during *** analysis and the effectiveness of the proposed control strategy are verified by modal analysis and simu-lation.

关键词： Doubly fed induction generator(DFIG) wind farms(WFs) dynamic stability low voltage ride through(LVRT) weak grid dynamic coupling

Multiscale analysis-based peridynamic simulation of fracture in porous media

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Frontiers of Structural and Civil Engineering 2024年第1期18卷 1-13页

作者： Zihao YANG Shangkun SHEN Xiaofei guan Xindang HE Junzhi CUI School of Mathematics and Statistics Northwestern Polytechnical UniversityXi’an 710072China School of Mathematical Sciences Tongji UniversityShanghai 200092China School of Mechanics Civil Engineering and ArchitectureNorthwestern Polytechnical UniversityXi’an 710072China LSEC ICMSECAcademy of Mathematics and Systems ScienceCASBeijing 100190China

The simulation of fracture in large-scale structures made of porous media remains a challenging *** techniques either assume a homogeneous model,disregarding the microstructure characteristics,or adopt a micro-mechanical model,which incurs an intractable computational cost due to its complex stochastic geometry and physical properties,as well as its nonlinear and multiscale *** this study,we propose a multiscale analysis-based dual-variable-horizon peridynamics(PD)model to efficiently simulate macroscopic structural *** influence of microstructures in porous media on macroscopic structural failure is represented by two PD parameters:the equivalent critical stretch and *** equivalent critical stretch is calculated using the microscale PD model,while the equivalent micro-modulus is obtained through the homogenization method and energy density equivalence between classical continuum mechanics and PD *** examples of porous media with various microstructures demonstrate the validity,accuracy,and efficiency of the proposed method.

关键词： porous media multiscale variable-horizon peridynamic equivalent critical stretch equivalent micro-modulus

Structural Engineering of Anode Materials for Low-Temperature Lithium-Ion Batteries:Mechanisms,Strategies,and Prospects

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Nano-Micro Letters 2024年第8期16卷 169-195页

作者： guan Wang Guixin Wang Linfeng Fei Lina Zhao Haitao Zhang Beijing Key Laboratory of Ionic Liquids Clean Process Institute of Process EngineeringChinese Academy of SciencesBeijing 100190People’s Republic of China School of Chemical Engineering Sichuan UniversityChengdu 610065People’s Republic of China School of Energy Materials and Chemical Engineering Hefei UniversityHefei 230601People’s Republic of China School of Materials Science and Engineering Nanchang UniversityNanchang 330031People’s Republic of China Key Laboratory of Polymer and Catalyst Synthesis Technology of Liaoning Province School of Environmental and Chemical EngineeringShenyang University of TechnologyShenyang 110870People’s Republic of China

The severe degradation of electrochemical performance for lithium-ion batteries(LIBs)at low temperatures poses a significant challenge to their practical ***,extensive efforts have been contributed to explore novel anode materials with high electronic conductivity and rapid Li^(+)diffusion kinetics for achieving favorable low-temperature performance of ***,we try to review the recent reports on the synthesis and characterizations of low-temperature anode ***,we summarize the underlying mechanisms responsible for the performance degradation of anode materials at subzero ***,detailed discussions concerning the key pathways(boosting electronic conductivity,enhancing Li^(+)diffusion kinetics,and inhibiting lithium dendrite)for improving the low-temperature performance of anode materials are ***,several commonly used low-temperature anode materials are briefly ***,recent progress in the engineering of these low-temperature anode materials is summarized in terms of structural design,morphology control,surface&interface modifications,and multiphase ***,the challenges that remain to be solved in the field of low-temperature anode materials are *** review was organized to offer valuable insights and guidance for next-generation LIBs with excellent low-temperature electrochemical performance.

关键词： Low-temperature performance Anode materials Microstructural regulations Surface modifications

Deep Learning Blockchain Integration Framework for Ureteropelvic Junction Obstruction Diagnosis Using Ultrasound Images

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Tsinghua Science and Technology 2024年第1期29卷 1-12页

作者： Yu guan Pengceng Wen Jianqiang Li Jinli Zhang Xianghui Xie Faculty of Information Technology Beijing University of TechnologyBeijing 100124China Beijing Children’s Hospital Affiliated to Capital Medical University Beijing 100020China

UreteroPelvic Junction Obstruction(UPJO)is a common hydronephrosis disease in children that can result in an even progressive loss of renal *** is an economical,radiationless,noninvasive,and high noise preliminary diagnostic step for *** intelligence has been widely applied to medical fields and can greatly assist doctors'diagnostic *** demand for a highly secure network environment in transferring electronic medical data online,therefore,has led to the development of blockchain *** this study,we built and tested a framework that integrates a deep learning diagnosis model with blockchain *** diagnosis model is a combination of an attention-based pyramid semantic segmentation network and a discrete wavelet transformation-processed residual classification *** also compared the performance between benchmark models and our *** diagnosis model outperformed benchmarks on the segmentation task and classification task with MloU=87.93,MPA=93.52,and accuracy=91.77%.For the blockchain system,we applied the InterPlanetary File System protocol to build a secure and private sharing *** framework can automatically grade the severity of UPJO using ultrasound images,guarantee secure medical data sharing,assist in doctors'diagnostic ability,relieve patients'burden,and provide technical support for future federated learning and linkage of the Internet of Medical Things(loMT).

关键词： data mining image processing and computer vision machine learning medical information systems

电子鼻结合GC-MS分析不同干燥方式对罗非鱼片挥发性风味成分的影响

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南方水产科学 2022年第1期18卷 135-143页

作者：罗静李敏张莹刘岩关志强广东海洋大学食品科技学院广东湛江524088 广东海洋大学机械与动力工程学院广东湛江524088 广东省水产品加工与安全重点实验室广东湛江524088

为了解不同干燥方式对罗非鱼片挥发性风味物质的影响,为罗非鱼片加工提供参考依据,采用电子鼻和顶空固相微萃取结合气相色谱-质谱联用技术(HS-SPME-GC-MS)分析了经超声波辅助聚葡萄糖渗透热泵干燥(UAPOHPD)、热泵干燥(HPD)、超声波辅助... 详细信息

为了解不同干燥方式对罗非鱼片挥发性风味物质的影响,为罗非鱼片加工提供参考依据,采用电子鼻和顶空固相微萃取结合气相色谱-质谱联用技术(HS-SPME-GC-MS)分析了经超声波辅助聚葡萄糖渗透热泵干燥(UAPOHPD)、热泵干燥(HPD)、超声波辅助聚葡萄糖渗透真空冷冻-热泵联合干燥(UAPOVFHPCD)和真空冷冻干燥(VFD)所得罗非鱼片干制品的挥发性风味物质,并对不同干制品的风味物质进行主成分分析,利用相对气味活度值确定不同干制品的关键风味成分。结果表明,电子鼻能较好地区分不同罗非鱼片干制品。其中,新鲜罗非鱼片有3种关键风味成分,UAPOVFHPCD制品有4种关键风味成分,而UAPOHPD、HPD和VFD制品均有5种关键风味成分。HPD制品挥发性气味物质的综合得分最高,其后依次为UAPOHPD、VFD和UAPOVFHPCD制品。

关键词：罗非鱼片干制品干燥方式挥发性风味物质电子鼻顶空固相微萃取结合气相色谱-质谱联用技术

重症颅脑损伤患者术后迟发性颅内血肿的临床治疗体会

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中国继续医学教育 2016年第24期8卷 136-137页

作者：管志强新疆巴音郭楞蒙古自治州轮台县人民医院神经外科新疆轮台841600

目的探究重症颅脑损伤患者术后迟发性颅内血肿的临床治疗方法及结果。方法对我院2014年2月~2016年2月期间收治的颅脑术后迟发性颅内血肿重症颅脑损伤患者30例的临床资料进行回顾性分析,分析其治疗方法及效果。结果 15例良好,8例中残,... 详细信息

目的探究重症颅脑损伤患者术后迟发性颅内血肿的临床治疗方法及结果。方法对我院2014年2月~2016年2月期间收治的颅脑术后迟发性颅内血肿重症颅脑损伤患者30例的临床资料进行回顾性分析,分析其治疗方法及效果。结果 15例良好,8例中残,6例重残,1例死亡。结论对重症颅脑损伤患者术后迟发性颅内血肿预防极其关键,给予有效的治疗方法可提升其治疗率,降低致残率与病死率,改善预后。

关键词：重症颅脑损伤迟发性颅内血肿临床治疗

急性期高血压脑出血患者经微创颅内血肿清除术和去骨瓣减压血肿清除术治疗的效果观察

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中国社区医师 2018年第24期34卷 23-24页

作者：管志强轮台县人民医院外三科新疆841600

目的:探讨微创颅内血肿清除术和去骨瓣减压血肿清除术治疗急性期高血压脑出血的效果。方法:收治急性期高血压脑出血患者100例,对照组给予去骨瓣减压血肿清除术治疗,观察组给予微创颅内血肿清除术治疗。比较两组治疗效果。结果:治疗后,... 详细信息

目的:探讨微创颅内血肿清除术和去骨瓣减压血肿清除术治疗急性期高血压脑出血的效果。方法:收治急性期高血压脑出血患者100例,对照组给予去骨瓣减压血肿清除术治疗,观察组给予微创颅内血肿清除术治疗。比较两组治疗效果。结果:治疗后,观察组患者美国国立卫生研究院卒中量表(NIHSS)评分低于对照组,Barthel指数(BI)高于对照组(P<0.05)。观察组并发症发生率低于对照组(P<0.05)。结论:微创颅内血肿清除术治疗急性期高血压脑出血效果显著。

关键词：急性期高血压脑出血微创颅内血肿清除术去骨瓣减压血肿清除术

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文蛤和波纹巴非蛤最佳抗冻剂配方的实验研究

食品与发酵工业 2006年第3期32卷 135-138页

作者：关志强宋小勇李敏广东海洋大学工程学院

以盐溶性蛋白溶解度、Ca2+ATPase活性和pH值为指标,通过正交实验L9(34)研究,探讨了防止文蛤和波纹巴非蛤蛋白质冷冻变性的最佳抗冻剂配方。实验结果表明,文蛤的最佳抗冻剂配方为焦磷酸钠0.1%、三聚磷酸钠0.1%、蔗糖2%、山梨醇3%;波纹巴... 详细信息

以盐溶性蛋白溶解度、Ca2+ATPase活性和pH值为指标,通过正交实验L9(34)研究,探讨了防止文蛤和波纹巴非蛤蛋白质冷冻变性的最佳抗冻剂配方。实验结果表明,文蛤的最佳抗冻剂配方为焦磷酸钠0.1%、三聚磷酸钠0.1%、蔗糖2%、山梨醇3%;波纹巴非蛤的最佳抗冻剂配方为焦磷酸钠0.1%、三聚磷酸钠0.15%、蔗糖4%、山梨醇3%。在添加最佳抗冻剂后文蛤的Ca2+ATPase活性、盐溶性蛋白溶解度和pH值分别提高了26.4%、25.5%和2%,波纹巴非蛤则分别提高了21%、38.5%和2.5%。

关键词：文蛤波纹巴非蛤蛋白质冷冻变性抗冻剂正交法

Field Load Test Based SHM System Safety Standard Determination for Rigid Frame Bridge

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Structural Durability & Health Monitoring 2024年第3期18卷 361-376页

作者： Xilong Zheng Qiong Wang Di guan School of Civil and Architectural Engineering Harbin UniversityHarbin150076China

The deteriorated continuous rigid frame bridge is strengthened by external prestressing. Static loading tests wereconducted before and after the bridge rehabilitation to verify the effectiveness of the rehabilitation process. Thestiffness of the repaired bridge is improved, and the maximum deflection of the load test is reduced from 37.9 to27.6 mm. A bridge health monitoring system is installed after the bridge is reinforced. To achieve an easy assessmentof the bridge’s safety status by directly using transferred data, a real-time safety warning system is createdbased on a five-level safety standard. The threshold for each safety level will be determined by theoretical calculationsand the outcomes of static loading tests. The highest risk threshold will be set at the ultimate limit statevalue. The remaining levels, namely middle risk, low risk, and very low risk, will be determined usingreduction coefficients of 0.95, 0.9, and 0.8, respectively.

关键词： Continuous rigid frame bridge rehabilitation long-term monitoring field load test safety standard determination