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4th Power System and Green Energy Conference (PSGEC)

作者： Guo, Ziteng zhang, Yu zhang, Chen Zong, Haoxiang Wang, fuwen Cai, Xu Shanghai Jiao Tong Univ Key Lab Control Power Transmiss & Convers Minist Educ Shanghai Peoples R China Shanghai Zhonglv New Energy Technol CO LTD Shanghai Peoples R China

ISBN: (纸本)9798350365573;9798350365580

Research on grid-forming (GFM) control strategies for wind turbines (WTs) has primarily focused on the electromagnetic characteristics of the WTs, overlooking the impact on the drivetrain. This limitation has hindered the application of GFM control strategies in engineering. To fill this gap, a two-mass drivetrain model is built to assess the influence of the bandwidth of the virtual synchronous generator (VSG) control strategy on drivetrain torsional vibration characteristics. A comparison of torsional vibration characteristics between the GFM-WT and traditional grid-following WT (GFL-WT) highlights the need for increased attention to drivetrain torsional vibration in GFM-WT. Then, the inadequacy of the traditional drivetrain torsional vibration suppression strategy (T-DTVSS) when applied in VSG control is examined. Finally, a novel drivetrain torsional vibration suppression strategy named virtual synchronous phase angle compensation drivetrain torsional vibration suppression strategy (VSPAC-DTVSS) is proposed, and the efficacy of this strategy is validated through simulation using PSCAD.

关键词： GFM-WT drivetrain torsional vibration suppression strategy

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Remote Localization of Network-based Automatic Guided Vehicles with a Novel Quantized Set-membership Approach

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INTERNATIONAL JOURNAL OF CONTROL AUTOMATION AND SYSTEMS 2022年第8期20卷 2447-2458页

作者： Yang, Hao zhang, Yilian Gu, Wei Yang, fuwen Shanghai Maritime Univ Key Lab Transport Ind Marine Technol & Control En Shanghai 201306 Peoples R China Griffith Univ Gold Coast Sch Engn & Built Environm Southport Qld 4222 Australia

This paper investigates the remote localization problem for a network-based automatic guided vehicle (AGV) system. Considering the constraints of network bandwidth and the interference of unknown-but-bounded (UBB) noises, a novel quantized set-membership approach is proposed. First, a differential zooming strategy is designed for the quantization process of the measurement signals in order to reduce the quantization error and the negative influence of the quantization effects. Then, a remote modified set-membership filter is designed to eliminate the influence of UBB noises and obtain the optimal position state estimation ellipsoid for the considered AGV. Sufficient conditions for the existence of the set-membership filter are derived and a recursive algorithm is provided for computing the ellipsoid that guarantees to contain the true state. Finally, the remote localization performance analysis verifies the effectiveness of the proposed quantized set-membership approach for the considered AGV.

关键词： Automatic guided vehicle quantization error remote localization set-membership filtering unknown-but-bounded noises wireless communication network

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理脾安肠汤治疗肠易激综合征临床观察

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中国中医药现代远程教育 2021年第23期19卷 37-39页

作者：田同儒李志中李柏张福文北京中医药大学东直门医院通州院区脾胃病科北京101100

目的观察理脾安肠汤治疗肠易激综合征患者的临床效果。方法选择2018年1月—2019年12月北京中医药大学东直门医院通州院区脾胃病科门诊153例肠易激综合征患者随机分为治疗组78例(口服中药理脾安肠汤)和对照组75例(口服马来酸曲美布汀胶... 详细信息

目的观察理脾安肠汤治疗肠易激综合征患者的临床效果。方法选择2018年1月—2019年12月北京中医药大学东直门医院通州院区脾胃病科门诊153例肠易激综合征患者随机分为治疗组78例(口服中药理脾安肠汤)和对照组75例(口服马来酸曲美布汀胶囊),观察2组治疗前后的症状、药物不良反应及复发率,评价2组的总体症状疗效和中医证候疗效。结果治疗前2组总体症状评分差异无统计学意义(P>0.05),具有可比性,治疗期间对照组3例出现不良反应,治疗组无不良反应发生;2组治疗后总体症状评分均较治疗前显著降低(P<0.01),治疗组(72.56±41.71)分显著低于对照组(137.58±42.45)分(P<0.01);治疗组中医证候疗效总有效率92.31%(72/78)显著高于对照组79.17%(57/72)(P<0.01);治疗组复发率21.79%(17/78)明显低于对照组41.67%(30/72)(P<0.01)。结论理脾安肠汤治疗肠易激综合征,可显著提高患者总体症状疗效和中医证候疗效,不良反应少,复发率低。

关键词：肠易激综合征理脾安肠汤中医药疗法

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Set-Membership Global Estimation of Networked Systems

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IEEE TRANSACTIONS ON CYBERNETICS 2022年第3期52卷 1454-1464页

作者： zhang, Yilian Xia, Nan Han, Qing-Long Yang, fuwen Shanghai Maritime Univ Minist Commun Key Lab Marine Technol & Control Engn Shanghai 201306 Peoples R China Marine Design & Res Inst China Dept Ship Res & Design Shanghai 200011 Peoples R China Swinburne Univ Technol Sch Software & Elect Engn Melbourne Vic 3122 Australia Griffith Univ Gold Coast Sch Engn & Built Environm Southport Qld 4222 Australia

This article is concerned with set-membership global estimation for a networked system under unknown-but-bounded process and measurement noises. First, a group of local set-membership estimators is deployed to obtain the local ellipsoidal estimate of the true system state. Each estimator is capable of communicating with its neighbors within its communication range. Second, a global estimation approach is proposed which generates a trace-maximal ellipsoid within the intersection of all the local estimation sets with an aim to improve the difference of the local estimate at each time instant. Sufficient conditions for providing a global estimate under both complete and incomplete measurement transmissions are derived. Third, as an application, a modified distributed photovoltaic grid-connected generation system is provided to verify the effectiveness of the developed set-membership global estimation approach. Furthermore, an islanding fault detection scheme is derived based on the calculated global ellipsoidal estimate. Finally, simulation verification of the obtained theoretical results on the distributed generation system is presented.

关键词： Estimation Ellipsoids Fault detection Islanding Robot sensing systems Noise measurement Nickel Distributed generation (DG) systems distributed set-membership estimation (DSE) global estimation networked systems unknown-but-bounded noises

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Embedding thermostable rGO/SiCxOy composite phase in SiC fibers for improved high temperature resistance

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CARBON 2025年 233卷

作者： Liu, Tao Han, Cheng Wang, Shanshan Ou, Yucheng zhang, Xiaoshan zhang, Songhe Song, Quzhi Du, Yiang Wang, fuwen Wang, Yingde Natl Univ Def Technol Coll Aerosp Sci & Engn Sci & Technol Adv Ceram Fibers & Composites Lab Changsha 410073 Peoples R China

Silicon carbide (SiC) fibers exhibit exceptional potential in harsh environment applications such as aerospace and nuclear energy. However, the high temperature mechanical properties of SiC fibers are still limited by the unmanageable microstructure. Herein, we propose an amorphous phase stabilizing strategy by embedding thermostable reduced graphene oxide/silicon oxycarbide (rGO/SiCxOy) composite phase in SiC fibers via the polymer-derived ceramic (PDC) method. Homodisperse vinyl-bridged graphene oxide/polycarbosilane (PCS) precursor is designed to transform into rGO/SiC fibers, accompanied by the formation of a more stable rGO/ SiCxOy composite structure that intersperses between SiC grains. Additionally, the rGO plays a role in suppressing the decomposition of SiCxOy and the rapid growth of SiC grains at elevated temperatures. As a result, the tensile strength of as-received 0.5%-rGO/SiC (2.64 GPa) and 1%-rGO/SiC (2.28 GPa) fibers are elevated by 40 % and 21 % respectively. Noteworthily, 1%-rGO/SiC fibers maintain a tensile strength of 0.57 GPa even after undergoing 1700 degrees C heat treatment, while the 0%-rGO/SiC fibers have nearly lost mechanical strength after annealing at 1600 degrees C. Consequently, the rGO exhibits significant potential for improving the high temperature resistance of ceramic fibers.

关键词： Polymer-derived ceramics SiC fibers Graphene SiC x O y amorphous phase High temperature resistance

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Associations between neutrophil-lymphocyte ratio and risk of cognitive impairment among Chinese older adults

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BMC GERIATRICS 2025年第1期25卷 1-7页

作者： Wang, Xin Wang, Binbin Du, Xueqing Liu, Peng Yang, fuwen Su, Jiao zhang, Yue Shanxi Med Univ Shanxi Bethune Hosp Tongji Shanxi Hosp Shanxi Acad Med SciHosp 3Dept Neurol Taiyuan Peoples R China Shanxi Normal Univ Sch Life Sci Taiyuan Peoples R China Shanxi Med Univ Shanxi Cardiovasc Hosp Inst Affiliated Hosp Dept Cardiovasc Surg Taiyuan Peoples R China Shanxi Med Univ Sch Publ Hlth Dept Epidemiol Key Lab Coal Environm Pathogen & PreventMinist Ed Taiyuan Peoples R China

Background Associations between the neutrophil-lymphocyte ratio (NLR) and cognitive performance in older population are rarely reported. We investigated the associations between NLR and risk of cognitive impairment in Chinese community-dwelling older adults. Methods Individuals aged >= 65 years from the 2011 and 2014 waves of the Chinese Longitudinal Healthy Longevity Survey were enrolled. We used the Chinese version of the Mini-Mental State Examination to evaluate cognitive function, with a score <18 indicating cognitive impairment. NLR was expressed as derived NLR (white blood cell count - lymphocyte count]/lymphocyte count). Logistic regression was used to evaluate the association between NLR levels and risk of cognitive impairment. Results The study enrolled 2375 cognitively healthy participants and 838 with cognitive impairment. Significantly higher NLR values were noted in the latter than in the former group. In the cross-sectional analysis, NLR values in the highest than in the lowest quartile indicated significantly increased risk of cognitive impairment, after controlling for all confounding factors. During follow-up, 134 of the 1173 healthy participants at baseline developed cognitive impairment. NLR values in the highest two quartiles indicated higher risk of cognitive impairment than those in the lowest quartile. When NLR was classified into dichotomous groups, the risk of cognitive impairment was significantly higher in the high-inflammation than in the noninflammatory status group, regardless of the analysis used (cross-sectional or prospective). Conclusions Elevated NLR status is associated with increased risk of cognitive impairment in Chinese community-dwelling older adults.

关键词： Neutrophil-lymphocyte ratio Cognitive impairment Inflammation Alzheimer's disease Older adults

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Application of fuzzy spiking neural dP systems in energy coordinated control of multi-microgrid

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JOURNAL OF MEMBRANE COMPUTING 2023年第1期5卷 69-80页

作者： Yu, Wenping Xiao, Xiangquan Wu, Jieping Chen, fuwen Zheng, Li zhang, Huijie Chengdu Technol Univ Sch Automation & Elect Engn Chengdu 611730 Peoples R China Sichuan Univ Coll Elect & Informat Engn Chengdu 610065 Peoples R China

To achieve carbon peaking and carbon neutrality goals, the research on technologies related to the grid connection of high proportion renewable energy has become a hot spot. Multi-microgrid is a feasible solution, only by ensuring the safe and stable operation of the multi-microgrid system can the advantages of the multi-microgrid be brought into full play. Different from other membrane systems, spiking neural dP systems can solve input problems in a distributed manner, making it suitable for the control field. First, to ensure the stable operation of the multi-microgrid, this paper introduces the fuzzy theory into the spiking neural dP systems and proposes fuzzy spiking neural dP systems (FSNdPS). The improved P system can better solve the problems of uncertainty and inaccuracy contained in the multi-microgrid information caused by the high proportion of new energy access. Second, the proposed FSNdPS are used to model the coordinated control of a typical multi-microgrid structure, and the corresponding coordinated control strategy is proposed. Finally, the correctness and feasibility of the proposed method are verified by a reasoning test and MATLAB simulation, and the safe and stable operation of multi-microgrid is realized.

关键词： Spiking neural dP systems Fuzzy theory Multi-microgrid Coordinated control

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Numerical and experimental analysis of fluid force for nuclear valve

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INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 2023年 241卷

作者： Li, Qingye Zong, Chaoyong Liu, fuwen zhang, Ao Xue, Tianhang Yu, Xinhai Song, Xueguan Dalian Univ Technol Sch Mech Engn Dalian 116023 Peoples R China East China Univ Sci & Technol Sch Mech & Power Engn Shanghai 200237 Peoples R China

Nuclear safety valve is a critical piece of equipment in a nuclear power plant, which is used to prevent irreversible damage caused by a sudden increase in pressure. However, there are some instances wherein valves may fail to function properly, which can have significantly impact the safety of the entire pressure/energy system. The main causes behind this phenomenon is the effect of fluid-structure coupling between the fluid force and valve disc. To better understand the fluid force, a high-fidelity computational fluid dynamics (CFD) model is established to predict the behavior of fluid forces and the location of vortices in the valve. Moreover, a visual fluid force test rig is used to verify the accuracy of the CFD model. Based on the validated CFD model, the mechanism of fluid force differences for two typical valve discs are analyzed in detail, together with the univariate effects of groove depth and valve opening on the fluid force. Based on the univariate analysis results, the coupling effect of groove depth and valve opening on fluid force is quantified using the supervised learning algorithm and Sobol sensitivity analysis. The study provides a new perspective on the characteristics of valve fluid force, and highlights the significant potential of dynamic control and energy conservation of valves.

关键词： CFD Surrogate model Experimental measurement Fluid force Nuclear power plant Valve

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19.35%-Efficiency organic solar cells and reduced non-radiative recombination energy loss by a ternary copolymerization strategy

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JOURNAL OF MATERIALS CHEMISTRY C 2025年第16期13卷 7957-7962页

作者： He, Dan Xie, Linwei Bai, Yahui Shen, Xingxing Wu, Xiangxi zhang, Jianqi Li, Xiaojun Li, Yongfang Zhao, fuwen Cent South Univ Coll Chem & Chem Engn State Key Lab Powder Met Changsha 410083 Peoples R China Hebei Normal Univ Sci & Technol Coll Chem Engn Qinhuangdao 066004 Peoples R China Chinese Acad Sci Inst Chem CAS Key Lab Organ Solids Beijing 100190 Peoples R China CAS Ctr Excellence Nanosci Natl Ctr Nanosci & Technol CAS Key Lab Nanosyst & Hierarch Fabricat Beijing 100190 Peoples R China

The low open-circuit voltage (VOC) imposed by the large energy loss, especially non-radiative recombination energy loss (Delta Enr), accounts for the behindhand power conversion efficiency (PCE) of organic solar cells (OSCs), compared to those of silicon/perovskite solar cells. Hence, it is vital to reduce Delta Enr to remedy the gap and further improve the PCEs. Herein, two terpolymer donors, DQ20 and DQ40, are developed via introducing a dimethyl dithieno[3,2-f:2 ',3 '-h]quinoxaline-2,3-dicarboxylate unit (TQC) into the backbone of D18 in consideration of the features of TQC. The introduction of TQC endows DQ20 and DQ40 with down-shifted energy levels and improved miscibility with the electron acceptor, L8-BO. As a result, the VOC increases from D18:L8-BO (0.895 V) to DQ20:L8-BO (0.906 V) to DQ40:L8-BO (0.920 V)-based OSCs, mainly ascribed to the gradually decreased Delta Enr. Moreover, the DQ20:L8-BO blend film exhibits fine phase separation with ordered molecular stacking, and thus achieves the highest charge carrier mobility and weakest charge recombination in devices for the best JSC (27.11 mA cm-2) and FF (78.73%). Consequently, DQ20:L8-BO based OSCs afford a higher PCE of 19.35%, compared with D18:L8-BO and DQ40:L8-BO counterparts. This work demonstrates that ternary copolymerization is an effective strategy to realize suppressed Delta Enr and high efficiency via finely tuning the energy level offset and miscibility between the donor and acceptor.

关键词： Carboxylation

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Surface hydroxyl-modulation for constructing isolated vanadium active species for propane dehydrogenation

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JOURNAL OF COLLOID AND INTERFACE SCIENCE 2025年 688卷 193-203页

作者： Yang, fuwen zhang, Jie Chen, Jinwei Wang, Gang Yu, Tong Li, Qian Shi, Zongbo Zhuo, Runsheng Wang, Ruilin Sichuan Univ Coll Mat Sci & Engn Chengdu 610065 Peoples R China Sichuan Univ Engn Res Ctr Alternat Energy Mat & Devices Minist Educ Chengdu 610065 Peoples R China REZEL Catalysts Corp Shanghai 200120 Peoples R China

Vanadium-based catalysts have been regarded as a promising candidate for Pt- and Cr-based materials in propane dehydrogenation (PDH) application. However, regulating the coordination environment and polymeric degree of vanadium oxides (VOX) at nanoscale level remains great challenges. Herein, an efficient VOX catalyst with the adjustable polymeric degree is achieved by a surface hydroxyl-modulation. Specially, the physicochemical properties of VOX species are precisely regulated by controlling the density and dispersion of hydroxyl (OH) on silicalite-1 (S-1). The properly introduced OH could effectively tailor the polymeric degree of VOX species. Characterization results reveal the VOX sites preferentially tend to migrate and anchor on the OH groups, thereby contributing to the high dispersion of VOX sites with tetrahedrally coordinated VO4 sites. Besides, the OH regulation is also favorable for moderating the surface V density, electron-rich V3+, and the isolated VOX active species. Benefiting from the active sites with suitable polymeric degree, the optimal 5VOX/S-1_550 catalyst exhibits outstanding catalytic activity (initial propane conversion of 24.5 %, initial propylene selectivity of 96.7 %) and stability under industrial conditions, which is comparable to the previously reported vanadium-based catalysts. This work not only affords an alternative methodology for the rational design of VOX-based catalysts, but also paves a way to improving PDH performance at the nanoscale.

关键词： Surface hydroxyl Vanadium oxides Structure-activity relationship Propane dehydrogenation Propylene production

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