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World Journal of Cardiovascular Diseases 2017年第12期7卷 451-457页

作者： Y. H. Cai q. li Z. li G. Yang D. Schranz MINGCI Cardiovascular Hospital Heart Center Wuxi China

A 17-year-old adolescent with non-operated double inlet left-ventricle and severe stenosed parachute mitral valve is reported. He was admitted with repetitive syncope related to intermittent atrial fibrillation. life-threatening syncope combined with pre- and post-capillary pulmonary hypertension together with his single ventricle pathophysiology led to the decision for left atrial decompression by percutaneous static atrial septum ballooning after transseptal needle perforation. Aiming to create a restrictive atrial septum defect, unloading of the left atrium without disturbing the balanced hemodynamics was directed for a long-term palliation or as a basis for a further surgical follow-up approach.

关键词： Double Inlet Left Ventricle Parachute Mitral Valve Pulmonary Hypertension Left Atrial Decompression

Location of Asymmetric Ground Fault Using Virtual Injected Current Ratio and Two-stage Recovery Strategy in Distribution Networks

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 151-161页

作者： Haiting Shan Luliang Zhang q.H.Wu Mengshi li School of Electric Power Engineering South China University of Technology(SCUT)Guangzhou 510641China

Sparse measurements challenge fault location in distribution *** paper proposes a method for asymmetric ground fault location in distribution networks with limited measurements.A virtual injected current vector is formulated to estimate the fault line,which can be reconstructed from voltage sags measured at a few buses using compressive sensing(CS).The relationship between the virtual injected current ratio(VICR)and fault position is deduced from circuit analysis to pinpoint the ***,a two-stage recovery strategy is proposed for improving reconstruction accuracy of the current vector,where two different sensing matrixes are utilized to improve the *** proposed method is validated in IEEE 34 node test *** results show asymmetric ground fault type,resistance,fault position and access of distributed generators(DGs)do not significantly influence performance of our *** addition,it works effectively under various scenarios of noisy measurement and line parameter *** on 134 node test feeders prove the proposed method is also suitable for systems with more complex structure.

关键词： Distribution networks fault location reconstruction accuracy two-stage recovery virtual injected current ratio

Convexification of Hybrid AC-DC Optimal Power Flow with line-Commutated Converters

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CSEE Journal of Power and Energy Systems 2024年第2期10卷 617-628页

作者： Hongyuan liang Zhigang li J.H.Zheng q.H.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China

line-commutated converter (LCC)-based high-voltage DC (HVDC) systems have been integrated with bulk AC power grids for interregional transmission of renewable power. The nonlinear LCC model brings additional nonconvexity to optimal power flow (OPF) of hybrid AC-DC power grids. A convexification method for the LCC station model could address such nonconvexity but has rarely been discussed. We devise an eq.ivalent reformulation for classical LCC station models that facilitates second-order cone convex relaxation for the OPF of LCC-based AC-DC power grids. We also propose sufficient conditions for exactness of convex relaxation with its proof. Eq.ivalence of the proposed LCC station models and properties, exactness, and effectiveness of convex relaxation are verified using four numerical simulations. Simulation results demonstrate a globally optimal solution of the original OPF can be efficiently obtained from relaxed model.

关键词： AC-DC power system convex relaxation linecommutated converter optimal power flow second-order cone programming

Therapeutic Outcome of Botulinum Toxin Type A for Patients with Low Bladder Compliance Secondary to Spinal Cord Injury

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Open Journal of Urology 2017年第11期7卷 207-211页

作者： H. Chen M. P. Huang T. H. Huang C. H. Jiang J. W. Zeng L. L. Zhou q. L. liu q. q. li X. Y. Yang Department of Urology Guangdong Provincial Work Injury Rehabilitation Hospital and Jinan University Guangdong China Departments of Urology Qingyan City People’s Hospital Jinan University Guangdong China

Objective: To evaluate the efficacy and safety of botulinum toxin type A (BTX-A) in treating patients with low bladder compliance (BC) secondary to spinal cord injury (SCI). Methods: From 2011 to 2016, we retrospected patients who received BTX-A injections for LBC secondary to SCI. The primary outcomes were urodynamic parameters including maximum detrusor pressure (Pdetmax), bladder compliance (BC). Related adverse events were recorded. Results: 72 SCI patients were selected (62 males, 10 females, age range 18 - 52 years;mean age 28.5 years). 12 weeks after BTX-A injection, Pdetmax decreased from 51.02 cmH2O to 28.31 cmH2O. BC increased from 3.64 ml/cmH2O to 10.08 ml/cmH2O. 12 patients had mild transient haematuria for 1 - 2 days. Conclusion: Intradetrusor BTX-A injection was effective and safe for patients with low BC secondary to SCI.

关键词： Botulinum Toxin Type A Low Bladder Compliance Spinal Cord Injury

Time-Opening Suprapubic Catheter versus Intermittent Catheter for Male Patients with Spinal Cord Injury (Spinal Level above Level C5)

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Open Journal of Urology 2016年第9期6卷 154-157页

作者： Hui Chen P. Tang R. B. Ou J. W. Zeng M. P. Huang q. L. liu q. q. li J. B. Huang T. H. Huang Chonghe Jiang Keji Xie Department of Urology Guangdong Provincial Work Injury Rehabilitation Hospital and Jinan University Guangzhou China Department of Urology Qingyan City People’s Hospital Jinan University Guangzhou China Department of Urology Guangzhou First Municipal People’s Hospital Guangzhou Medical University Guangzhou China

Objective: To compare the short-time complications associated with time-opening suprapubic catheter (SPT) versus intermittent catheter (IC) in male patients with spinal cord injury (above level C5). Methods: A prospective review of records was carried out to identify SCI patients managed with SPT or IC between 2011 and 2016. The complications included renal function (Serum creatinine), urinary tract infection (UTI), bladder stones, urethral complications, scrotal, and gross hematuria. Patients were followed at week 4, 3 and 6 months;the urodynamic assessment was repeated at 6 months. Results: A total of 30 patients (11 SPT, 19 IC) were recruited in this trial. There is no significant difference between the two catheter groups for the entire out-come. Scrotal abscesses and urethral stricture were only seen in patients with IC. Conclusions: SPT has similar urological complication with IC for SCI patients (above level C5) except the incidence of scrotal abscesses and urethral stricture.

关键词： Suprapubic Catheter Intermittent Catheter Spinal Cord Injury

Observability Analysis of Integrated Electricity and Heating Systems with Thermal q.asi-dynamics in Pipelines

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1145-1158页

作者： Zhigang li Wenjian Zheng Junbo Zhao J.H.Zheng q.H.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China Fuzhou Changle District Power Supply Company of State Grid Fujian Electric Power Co. Ltd.Fuzhou 350000China Department of Electrical and Computer Engineering University of ConnecticutStorrsCT 06269USA CSEE IEEE

Observability analysis(OA)is vital to obtaining the available input measurements of state estimation(SE)in an integrated electricity and heating system(IEHS).Considering the thermal q.asi-dynamics in pipelines,the measurement eq.ations in heating systems are dependent on the estimated results,leading to an interdependency between OA and *** OA methods req.ire measurement eq.ations be known exactly before SE is performed,and they are not applicable to *** bridge this gap,a scenario-based OA scheme for IEHSs is devised that yields reliable analysis results for a predefined set of time-delay scenarios to cope with this *** its core procedure,the observable state identification and observability restoration are formulated in terms of integer linear *** tests are conducted to demonstrate the validity and superiority of the proposed formulation.

关键词： Integrated electricity and heating system measurement observability analysis state estimation thermal q.asi-dynamics

Network Embedding Algorithm for Vulnerability Assessment of Power Transmission lines Using Integrated Structure and Attribute Information

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CSEE Journal of Power and Energy Systems 2024年第1期10卷 351-360页

作者： Xianglong lian Tong q.an Zepeng li Xingyu Chen Wenhu Tang q.H.Wu School of Electric Power Engineering South China University of TechnologyGuangzhou 510640China

In power systems,failures of vulnerable lines can trigger large-scale cascading failures,and vulnerability assessment is dedicated to locating these lines and reducing the risks of such *** on a structure and attribute network embedding(SANE)algorithm,a novel q.antitative vulnerability analysis method is proposed to identify vulnerable lines in this ***,a two-layered random walk network with topological and electrical properties of transmission lines is ***,based on the weighted degree of nodes in the two-layered network,the inter-layer and intra-layer walking transition probabilities are developed to obtain walk ***,a Word2Vec algorithm is applied to obtain lowdimension vectors representing transmission lines,according to obtained walk seq.ences for calculating the vulnerability index of transmissions ***,the proposed method is compared with three widely used methods in two test *** show the network embedding based method is superior to those comparison methods and can provide guidance for identifying vulnerable lines.

关键词： Network embedding random walk transmission lines vulnerability assessment

Simulation Analysis of Deformation Control for Magnetic Soft Medical Robots

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IEEE/CAA Journal of Automatica Sinica 2024年第3期11卷 794-796页

作者： Jingxi Wang Baoyu liu Edmond q.Wu Jin Ma Ping li Key Laboratory of Biomechanics and Mechanobiology(Beihang University) Ministry of Education Beijing Advanced Innovation Center for Biomedical Engineeringthe School of Biological Science and Medical EngineeringBeihang UniversityBeijing100083China IEEE the Department of Automation Shanghai Jiao Tong UniversityShanghai 200240China the Department of Aerospace Medicine Air Force Medical UniversityXi’an 710032China

Dear Editor,This letter presents a biocompatible cross-shaped magnetic soft robot and investigates its deformation mode control strategy through COMSOL modeling and *** soft robots offer novel avenues for precise trea... 详细信息

关键词： robot simulation COMSOL

Microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with different prestrain levels

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Journal of Materials Science & Technology 2024年第4期171卷 80-93页

作者： Y.H.Zhang H.li Z.W.Yang X.liu q.F.Gu State Key Laboratory of Solidification Processing School of Materials Science and EngineeringNorthwestern Polytechnical UniversityXi’an 710072China Shaanxi Key Laboratory of High-Performance Precision Forming Technology and Eq.ipment Northwestern Polytechnical UniversityXi’an 710072China

Ni_(47)Ti_(44)Nb_(9)shape memory alloy(SMA)is a promising material in the aerospace field due to its wide transformation *** application of shape memory effect depends on multistep thermomechan-ical loading,viz.,low-temperature deformation and subseq.ent heating to ***-temperature deformation prestrain plays a pivotal role in shape memory properties tailoring of SMA ***,microstructure evolution and deformation mechanisms of Ni_(47)Ti_(44)Nb_(9)SMA subjected to vari-ous prestrain levels are still *** this end,microstructure evolution and shape memory behaviors of Ni_(47)Ti_(44)Nb_(9)alloy subjected to multistep thermomechanical loading with prestrain levels of 8%-16%at-28℃(M_(s)+30℃)were *** results demonstrate that the stress-strain curve of the specimen exhibits four distinct stages at a maximal prestrain of 16%.Whereas stageⅡand stageⅢend at prestrains of∼8%and∼12%,*** stageⅡ,the stress-induced martensitic transformation is accompanied by the dislocation slip of the NiTi matrix andβ-Nb *** stageⅢ,in addition to the higher density of dislocations and further growth of stress-induced martensite variants(SIMVs),(001)compound twins are introduced as a result of the(001)deformation twinning in stress-induced ***{20-1}martensite twins are gradually introduced in stageⅣ.Correspondingly,after subseq.ent unloading and heating,a higher density of{114}austenite twins form in the specimen with a larger prestrain of 16%.With increasing prestrain from 8%to 16%,the recoverable strainε_(re)^(T)upon heating increases first and then ***ε_(re)^(T)obtains a maximum of 7.03%at 10%prestrain and de-creases to 6.17%at 16%*** increase ofε_(re)^(T)can be attributed to the formation of new SIMVs,the further growth of existing SIMVs,and the recoverable(001)compound *** the decrease ofε_(re)^(T)is mainly associated with the irrecoverable strain by{20−1}martensite *** effe

关键词： Ni_(47)Ti_(44)Nb_(9)shape memory alloy Wide transformation hysteresis Thermomechanical loading Microstructure evolution Shape memory behaviors Stress-induced martensitic transformation Deformation twinning

Effect of Substrate Bias on Microstructure and Properties of Tetrahedral Amorphous Carbon Films

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Effect of Substrate Bias on Microstructure and Properties of...