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基于SOFC/GT和掺氢天然气的综合能源系统性能研究及经济性分析

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动力工程学报 2024年第9期44卷 1493-1502页

作者：孙浩哲张辉盛明珺戴申华王玉璋上海交通大学机械与动力工程学院上海200240 大唐三亚未来能源研究所有限公司海南三亚572024

提出了一种以固体氧化物燃料电池(SOFC)/燃气轮机(GT)为原动机,以掺氢天然气为燃料的综合能源系统。建立了风光发电和制氢设备、SOFC/GT系统、冷热电能源转换和存储设备、碳捕集设备等多种类型能源利用设备的数学模型,在考虑多种负荷平... 详细信息

提出了一种以固体氧化物燃料电池(SOFC)/燃气轮机(GT)为原动机,以掺氢天然气为燃料的综合能源系统。建立了风光发电和制氢设备、SOFC/GT系统、冷热电能源转换和存储设备、碳捕集设备等多种类型能源利用设备的数学模型,在考虑多种负荷平衡约束、设备运行约束和“双碳”目标约束的情况下研究了综合能源系统的性能与经济性。结果表明:随着燃料掺氢比的增加,SOFC/GT系统发电效率从60.36%增加到64.79%,综合能源利用率从87.80%增加到90.80%;系统使用可再生能源制氢时,碳排放量最低,尽管考虑了碳交易收益,但高昂的制氢成本导致系统运行成本最高。

关键词：综合能源系统固体氧化物燃料电池/燃气轮机掺氢比经济性分析

Unknown fault detection for EGT multi-temperature signals based on self-supervised feature learning and unary classification

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能源前沿:英文版 2023年第4期17卷 527-544页

作者： Xilian YANG Kanru CHENG Qunfei ZHAO yuzhang wang School of Electronic Information and Electrical Engineering Shanghai Jiao Tong UniversityShanghai200240China School of Mechanical Engineering Shanghai Jiao Tong UniversityShanghai200240China

Intelligent tpower systems scanimprove operational efficiency by installing a large number of ***-based methods of supervised learning have gained popularity because of available Big Data and computing ***,the common paradigm of the loss function in supervised learning requires large amounts of labeled data and cannot process unlabeled *** scarcity of fault data and a large amount of normal data in practical use pose great challenges to fault detection ***,sensor data faults in power systems are dynamically changing and pose another ***,a fault detection method based on self-supervised feature learning was proposed to address the above two ***,self-supervised learning was employed to extract features under various working conditions only using large amounts of normal *** self-supervised representation learning uses a sequence-based Triplet *** extracted features of large amounts of normal data are then fed into a unary *** proposed method is validated on exhaust gas temperatures(EGTs)of a real-world 9F gas turbine with sudden,progressive,and hybrid faults.A comprehensive comparison study was also conducted with various feature extractors and unary *** results show that the proposed method can achieve a relatively high recall for all kinds of typical *** model can detect progressive faults very quickly and achieve improved results for comparison without feature extractors in terms ofF1 score.

关键词： fault detection unary classification self-supervised representation learning multivariate nonlinear time series

肘关节僵硬开放松解术后尺神经炎发生的影响因素分析

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中华骨与关节外科杂志 2024年第1期17卷 50-57页

作者：张晶晶孙志坚谭杰王宇章余翔公茂琪太原西山医院骨科太原030053 首都医科大学附属北京积水潭医院创伤骨科北京100035 首都医科大学附属北京积水潭医院康复医学科北京100035

目的:探讨肘关节僵硬开放松解术后出现尺神经炎的影响因素。方法:对2020年4月至2021年6月间因肘关节僵硬行开放松解术的96例患者的术后最大屈曲改善角度、最大伸直改善角度及术后尺神经炎发生及转归情况进行随访。结果:根据纳入与排除标... 详细信息

目的:探讨肘关节僵硬开放松解术后出现尺神经炎的影响因素。方法:对2020年4月至2021年6月间因肘关节僵硬行开放松解术的96例患者的术后最大屈曲改善角度、最大伸直改善角度及术后尺神经炎发生及转归情况进行随访。结果:根据纳入与排除标准,共纳入男59例,女37例,年龄14~62岁,平均(37.3±10.7)岁。术后出现尺神经炎症状患者29例,其中McGowanⅠ型28例,McGowanⅡ型1例。随访时间12~25个月,平均(17.1±4.0)个月,27例患者症状完全缓解。二分类logistic回归分析结果表明,患者性别、原始损伤类型、术后最大屈曲改善角度是肘关节僵硬松解术后尺神经炎发生的主要风险因素。女性患者术后出现尺神经炎并发症的风险是男性患者的3.712倍(OR=3.712,95%CI:1.592~8.653);原始损伤类型为肘关节周围骨折或脱位的患者,术后出现尺神经炎并发症的风险是肘关节外骨折或非骨折患者的4.552倍(OR=4.552,95%CI:1.053~19.681);术后屈曲改善度在60°及以上的患者,术后出现尺神经炎的风险是术后屈曲改善度在30°及以下患者的14.184倍(OR=14.184,90%CI:2.199~91.478)。结论:肘关节僵硬松解术后尺神经炎发生率较高,既往患有肘关节周围骨折或脱位、女性患者、术后最大屈曲改善角度60°及以上是术后出现尺神经炎的主要风险因素。

关键词：肘关节僵硬开放松解术尺神经炎风险因素

Fabrication of Ordered Micro/Nanostructures Using Probe‑Based Force‑Controlled Micromachining System

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Chinese Journal of Mechanical Engineering 2022年第6期35卷 178-193页

作者： Yanquan Geng yuzhang wang Jianxiong Cai Jingran Zhang Yongda Yan Key Laboratory of Micro‑systems and Micro‑structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbin 150001China Center for Precision Engineering Harbin Institute of TechnologyHarbin 150001China College of Mechanical and Electric Engineering Changchun University of Science and TechnologyChangchun 130000China

This paper presents a probe-based force-controlled nanoindentation method to fabricate ordered micro/*** the experimental and finite element simulation approaches are employed to investigate the influence of the interval between the adjacent indentations and the rotation angle of the probe on the formed micro/*** non-contacting part between indenter and the sample material and the height of the material pile-up are two competing factors to determine the depth relationship between the adjacent *** the one array indentations,nanostructures with good depth consistency and periodicity can be formed after the depth of the indentation becoming stable,and the variation of the rotation angle results in the large difference between the morphology of the formed nanostructures at the bottom of the one array *** addition,for the indentation arrays,the nanostructures with good consistency and periodicity of the shape and depth can be generated with the spacing greater than 1μ***,Raman tests are also carried out based on the obtained ordered micro/nanostructures with Rhodamine probe *** indentation arrays with a smaller spacing lead to better the enhancement effect of the substrate,which has the potential applications in the fields of biological or chemical molecular detection.

关键词： Ordered micro/nanostructure Probe-based micromachining In-process force-controlled Indentation array Micro cutting

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电除尘节能控制系统在烧结厂的应用

冶金设备管理与维修 2024年第1期42卷 19-21页

作者：王占辉李庆勇王玉章日照钢铁控股集团有限公司山东日照276800

本文结合烧结厂15#机头电除尘控制系统改造,收集了相关运行数据,对节能降耗进行了研究分析,在相同生产状态下节电率达到58%,粉尘浓度降低了48%,改造效果明显,为同类型的电除尘节能改造提供参考。

关键词：电除尘节能自动控制

Study of machining indentations over the entire surface of a target ball using the force modulation approach

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International Journal of Extreme Manufacturing 2021年第3期3卷 64-72页

作者： yuzhang wang Yanquan Geng Guo Li Jiqiang wang Zhuo Fang Yongda Yan Key Laboratory of Micro-systems and Micro-structures Manufacturing of Ministry of Education Harbin Institute of TechnologyHarbinHeilongjiang 150001People’s Republic of China Center for Precision Engineering Harbin Institute of TechnologyHarbinHeilongjiang 150001People’s Republic of China Research Center of Laser Fusion China Academy of Engineering PhysicsMianyangSichuan 621900People’s Republic of China

A modified five-axis cutting system using a force control cutting strategy was to machine indentations in different annuli on the entire surface of a target *** relationship between the cutting depths and the applied load as well as the microsphere rotation speed were studied experimentally to reveal the micromachining *** particular,aligning the rotating center of the high precision spindle with the microsphere center is essential for guaranteeing the machining accuracy of *** distance between adjacent indentations on the same annulus and the vertical distance between adjacent annuli were determined by the rotating speed of the micro-ball and the controllable movement of the high-precision stage,*** order to verify the feasibility and effect of the proposed cutting strategy,indentations with constant and expected depths were conducted on the entire surface of a hollow thin-walled micro-ball with a diameter of 1 *** results imply that this machining methodology has the potential to provide the target ball with desired modulated defects for simulating the inertial confinement fusion implosion experiment.

关键词： force modulation controllable indentations entire micro-ball surface microsphere center alignment

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超高性能混凝土T形截面梁受剪性能试验研究

应用技术学报 2024年第1期24卷 55-62页

作者：丁文胜汪裕章聂振林王涛杨帅上海应用技术大学城市建设与安全工程学院上海201418 东南大学土木工程学院南京211189

对9片超高性能混凝土(UHPC)T形梁设计进行了受剪性能试验,分析钢纤维掺量、配箍率和剪跨比等主要参数对试验梁破坏形态、裂缝开展过程和抗剪承载力的响应影响规律。基于公开发表的57片UHPC梁受剪实测数据,分析对比了既有多国规范的抗剪... 详细信息

对9片超高性能混凝土(UHPC)T形梁设计进行了受剪性能试验,分析钢纤维掺量、配箍率和剪跨比等主要参数对试验梁破坏形态、裂缝开展过程和抗剪承载力的响应影响规律。基于公开发表的57片UHPC梁受剪实测数据,分析对比了既有多国规范的抗剪承载力计算方法。试验结果表明:UHPC-T梁具有较高的抗剪承载力和延性,2%~3%的配纤率有助于更好地发挥钢纤维的抗剪贡献,既有规范对UHPC-T梁的抗剪承载力计算偏保守,对钢纤维的贡献有待进一步研究。

关键词：超高性能混凝土配纤率配箍率剪跨比受剪性能

A Simulated Investigation of Ductile Response of GaAs in Single-Point Diamond Turning and Experimental Validation

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Nanomanufacturing and Metrology 2020年第4期3卷 239-250页

作者： Pengfei Fan Fei Ding Xichun Luo Yongda Yan Yanquan Geng yuzhang wang Centre for Precision Manufacturing DMEMUniversity of StrathclydeGlasgowUK Center for Precision Engineering Harbin Institute of TechnologyHarbinPeople's Republic of China

In this paper,molecular dynamic(MD)simulation was adopted to study the ductile response of single-crystal GaAs during single-point diamond turning(SPDT).The variations of cutting temperature,coordination number,and cutting forces were revealed through MD *** experiment was also carried out to qualitatively validate MD simulation model from the aspects of normal cutting *** simulation results show that the fundamental reason for ductile response of GaAs during SPDT is phase transition from a perfect zinc blende structure(GaAs-I)to a rock-salt structure(GaAs-II)under high ***,a strong anisotropic machinability of GaAs was also found through MD simulations.

关键词： Molecular dynamic simulation Single-point diamond turning Gallium arsenide Anisotropy Ductile response

Review Article Li-current collector interface in lithium metal batteries

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Nano Research 2024年第10期17卷 8706-8728页

作者： Tian-Yu wang Dingyi Zhao Keyue Liang yuzhang Li Department of Chemical and Biomolecular Engineering University of CaliforniaLos AngelesLos AngelesCalifornia 90095USA

Interfaces within batteries,such as the widely studied solid electrolyte interface(SEI),profoundly influence battery *** these interfaces,the solid-solid interface between electrode materials and current collectors is crucial to battery performance but has received less discussion and *** review highlights the latest research advancements on the solid-solid interface between lithium metal(the next-generation anode)and current collectors(typically copper),focusing on factors affecting the Li-current collector interface and improvement strategies from perspectives of current collector substrate(lithiophilicity,crystal facets,mechanical properties,and topological structure),electrolyte chemistry,current density,stacking pressure,SEI,electric field and temperature,and provides a future directions and opportunities on this topic.

关键词： lithium metal anode current collectors Li-current collector interface solid-solid interface improvement strategies