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超音速火焰喷涂氧燃比对铁基非晶涂层性能的影响

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材料导报 2024年第12期38卷 148-153页

作者：俞伟元董鹏飞吴保磊兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州730050

非晶涂层具有优良的物理和化学性能,在工业中有广泛的应用。以FeCrMoCBSi非晶粉末为喷涂粉末,采用超音速火焰喷涂(HVOF)技术在不同喷涂参数下在Q235钢基板上沉积了铁基非晶涂层。通过X射线衍射仪(XRD)、差示扫描热仪(DSC)、扫描电子显微... 详细信息

非晶涂层具有优良的物理和化学性能,在工业中有广泛的应用。以FeCrMoCBSi非晶粉末为喷涂粉末,采用超音速火焰喷涂(HVOF)技术在不同喷涂参数下在Q235钢基板上沉积了铁基非晶涂层。通过X射线衍射仪(XRD)、差示扫描热仪(DSC)、扫描电子显微镜(SEM)、维氏显微硬度计等测试方法,探讨氧燃比对涂层显微组织、微观结构及耐磨性的影响。研究表明,随着喷涂氧燃比的减小,涂层的非晶相含量呈增加趋势。这是因为过量的氧气会降低喷涂过程中颗粒的熔化程度,并使颗粒氧化。涂层的显微硬度和耐磨性随氧燃比的减小而增加。这是因为在较小氧燃比下,颗粒熔化程度增加,与基板间润湿性增加,孔隙率减小。三种铁基非晶涂层相比于Q235钢基板均具有更加优良的耐磨性,有望成为碳钢表面保护和耐磨涂层的候选材料。

关键词：铁基非晶涂层氧燃比显微组织耐磨性

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激光熔覆工艺参数对铁基非晶涂层性能的影响

特种铸造及有色合金 2024年第4期44卷 536-541页

作者：董鹏飞吴保磊俞伟元兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室兰州730050

采用同轴送粉激光熔覆工艺在Q235钢表面制备了最大熔覆厚度为1 mm的Fe-Cr-Mo-C-B-Si非晶涂层。研究了激光熔覆工艺参数对熔覆层非晶形成能力、微观组织、显微硬度、耐磨性及耐腐蚀性能的影响。结果表明,熔覆层中的非晶相含量与激光能量... 详细信息

采用同轴送粉激光熔覆工艺在Q235钢表面制备了最大熔覆厚度为1 mm的Fe-Cr-Mo-C-B-Si非晶涂层。研究了激光熔覆工艺参数对熔覆层非晶形成能力、微观组织、显微硬度、耐磨性及耐腐蚀性能的影响。结果表明,熔覆层中的非晶相含量与激光能量密度密切相关,与熔覆层性能呈正相关。随着激光能量密度增加,熔覆层的非晶相含量、显微硬度、耐磨性和耐蚀性均呈先增加后减小的趋势。能量密度为125.00 J/mm2时制备的熔覆层具有最好的耐磨及耐蚀性能,这主要是细晶强化和非晶强化的作用。

关键词：激光熔覆激光能量密度显微硬度耐磨性耐蚀性

Universal adversarial examples and perturbations for quantum classifiers

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National Science Review 2022年第6期9卷 48-55页

作者： weiyuan Gong dong-Ling Deng Center for Quantum Information Institute for Interdisciplinary Information Sciences (ⅢS) Tsinghua University Shanghai Qi Zhi Institute

Quantum machine learning explores the interplay between machine learning and quantum physics, which may lead to unprecedented perspectives for both fields. In fact, recent works have shown strong evidence that quantum computers could outperform classical computers in solving certain notable machine learning tasks. Yet, quantum learning systems may also suffer from the vulnerability problem: adding a tiny carefully crafted perturbation to the legitimate input data would cause the systems to make incorrect predictions at a notably high confidence level. In this paper, we study the universality of adversarial examples and perturbations for quantum classifiers. Through concrete examples involving classifications of real-life images and quantum phases of matter, we show that there exist universal adversarial examples that can fool a set of different quantum classifiers. We prove that, for a set of k classifiers with each receiving input data of n qubits, an O(ln [k]/2~n) increase of the perturbation strength is enough to ensure a moderate universal adversarial risk. In addition, for a given quantum classifier, we show that there exist universal adversarial perturbations, which can be added to different legitimate samples to make them adversarial examples for the classifier. Our results reveal the universality perspective of adversarial attacks for quantum machine learning systems, which would be crucial for practical applications of both near-term and future quantum technologies in solving machine learning problems.

关键词： quantum machine learning quantum classifiers adversarial examples measure concentration quantum no-free-lunch theorem

大规模风电并网后江苏电网柔直换流站与UPFC的有功功率协调控制方法

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南方电网技术 2024年第3期18卷 138-145页

作者：刘柏良汪惟源张君黎程锦闽董芷函徐政国网江苏省电力有限公司南京210003 浙江大学电气工程学院杭州310027

随着“双碳”战略的提出与实施,我国将着力建设以新能源为主的新型电力系统。然而,风电等新能源大规模并网将给具有交直流混联特征的新型电力系统带来威胁与挑战。通过以十四五规划末期的江苏电网为例进行分析,发现在大规模风电并网背景... 详细信息

随着“双碳”战略的提出与实施,我国将着力建设以新能源为主的新型电力系统。然而,风电等新能源大规模并网将给具有交直流混联特征的新型电力系统带来威胁与挑战。通过以十四五规划末期的江苏电网为例进行分析,发现在大规模风电并网背景下,江苏电网中部分“南北向”500 kV交流输电线路N-1后负载过重的问题亟待解决。为此,基于综合灵敏度计算方法,提出了一种综合利用柔直换流站和统一潮流控制器的有功功率协调控制方法,用于改善系统潮流分布并消除潜在的线路过载。最后,以江苏电网为例进行了仿真分析,对苏州500 kV统一潮流控制器、白鹤滩-江苏直流和某规划中三端柔直换流站进行了有功协调控制。结果表明,所提协调控制方法应用于江苏电网时可有效解决交流输电通道N-1后负载过重问题,且相比于典型最优化方法在计算速度上具有优势。

关键词：风电并网模块化多电平换流器统一潮流控制器协调控制混合级联直流系统

Simultaneously Regulating Uniform Zn^(2+) Flux and Electron Conduction by MOF/rGO Interlayers for High‑Performance Zn Anodes

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Nano-Micro Letters 2021年第5期13卷 34-44页

作者： Ziqi wang Liubing dong weiyuan Huang Hao Jia Qinghe Zhao Yidi wang Bin Fei Feng Pan Department of Materials Science and Engineering College of Chemistry and Materials ScienceJinan UniversityGuangzhou 510632People’s Republic of China School of Advanced Materials Peking University Shenzhen Graduate SchoolShenzhen 518055People’s Republic of China Nano Center Institute of Textiles and ClothingHong Kong Polytechnic UniversityHunghomKowloonHong Kong 999077People’s Republic of China

Owing to the merits of low cost,high safety and environmental benignity,rechargeable aqueous Zn-based batteries(ZBs)have gained tremendous attention in recent ***,the poor reversibility of Zn anodes that originates from dendrite growth,surface passivation and corrosion,severely hinders the further development of *** tackle these issues,here we report a Janus separator based on a Zn-ion conductive metal-organic framework(MOF)and reduced graphene oxide(rGO),which is able to regulate uniform Zn2+flux and electron conduction simultaneously during battery *** by the MOF/rGO bifunctional interlayers,the Zn anodes demonstrate stable plating/stripping behavior(over 500 h at 1 mA cm^(−2)),high Coulombic efficiency(99.2%at 2 mA cm^(−2) after 100 cycles)and reduced redox ***,it is also found that the Zn corrosion can be effectively retarded through diminishing the potential discrepancy on Zn *** a separator engineering also saliently promotes the overall performance of Zn|MnO2 full cells,which deliver nearly 100%capacity retention after 2000 cycles at 4 A g^(−1) and high power density over 10 kW kg^(−1).This work provides a feasible route to the high-performance Zn anodes for ZBs.

关键词： Zn-based battery Zn anode Janus separator Metal-organic framework Reduced graphene oxide

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水疱型毛母质瘤1例

皮肤性病诊疗学杂志 2024年第3期31卷 190-192页

作者：高国敏张东马伟元潍坊医学院附属医院山东潍坊261041

报告水疱型毛母质瘤1例。患者男,26岁,右肘部屈侧皮肤肿物7年。皮肤科检查:右肘部屈侧可见一约3.0 cm×3.0 cm×1.0 cm大小类圆形松弛的淡红色水疱,隆起皮面,边界清楚,无破溃与渗液,触之有波动感,水疱基底部可扪及一约1.5 cm×1.0 cm×0... 详细信息

报告水疱型毛母质瘤1例。患者男,26岁,右肘部屈侧皮肤肿物7年。皮肤科检查:右肘部屈侧可见一约3.0 cm×3.0 cm×1.0 cm大小类圆形松弛的淡红色水疱,隆起皮面,边界清楚,无破溃与渗液,触之有波动感,水疱基底部可扪及一约1.5 cm×1.0 cm×0.3 cm大小的质硬结节,活动度差,形状欠规则,触压痛不明显。皮损组织病理:表皮正常,肿瘤位于真皮内,肿瘤细胞团块周围可见扩张淋巴管,其中充满淋巴液,肿瘤团块由基底样细胞及影子细胞构成。诊断为水疱型毛母质瘤。予手术完整切除,创面愈合良好。目前随访未复发。

关键词：毛母质瘤水疱型肘部

Three-dimensional (3D) hydrogel serves as a platform to identify potential markers of chondrocyte dedifferentiation by combining RNA sequencing

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Bioactive Materials 2021年第9期6卷 2914-2926页

作者： Yang Ling weiyuan Zhang Peiyan wang Wanhua Xie Wei Yang dong-An wang Changjiang Fan Institute for Translational Medicine The Affiliated Hospital of Qingdao UniversityCollege of MedicineQingdao UniversityQingdao266021ShandongPR China Department of Human Anatomy Histology and Embryology School of Basic MedicineCollege of MedicineQingdao UniversityQingdao266071ShandongPR China School of Basic Medicine College of MedicineQingdao UniversityQingdao266071ShandongPR China The Precise Medicine Center Shenyang Medical CollegeShenyang110034LiaoningPR China Department of Biomedical Engineering City University of Hong KongKowloonHong KongChina Shenzhen Research Institute City University of Hong KongShenzhen Hi-tech Industrial ParkShenzhenGuangdong518057PR China Karolinska Institute Ming Wai Lau Centre for Reparative Medicine HKSTPSha TinHong KongChina

Dedifferentiation of chondrocyte greatly restricts its function and application,however,it is poorly understood except a small number of canonical *** non-cell-adhesive property endows polysaccharide hydrogel with the ability to maintain chondrocyte phenotype,which can serve as a platform to identify new molecular markers and therapeutic targets of chondrocyte *** this study,the high-throughput RNA sequencing(RNA-seq)was first performed on articular chondrocytes at primary(P0)and passage 1(P1)stages to explore the global alteration of gene expression along with chondrocyte ***,several potential marker genes,such as PFKFB3,KDM6B,had been identified via comparatively analyzing their expression in P0 and P1 chondrocytes as well as in 3D constructs(***-laden alginate hydrogel and HA-MA hydrogel)at both mRNA and protein ***,the changes in cellular morphology and enriched pathway of differentially expressed genes during chondrocyte dedifferentiation was studied in *** study developed the use of hydrogel as a platform to investigate chondrocyte dedifferentiation;the results provided new molecular markers and potential therapeutic targets of chondrocyte dedifferentiation.

关键词： Chondrocyte dedifferentiation Hydrogel Gene expression RNA sequencing

金属膜过滤工艺保障不同管材供水管网水质生物稳定性的研究

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水处理技术 2024年第5期50卷 86-91页

作者：朱海龙刘唯源邓博苑张雅梅董志强李伟英同济大学环境科学与工程学院 200092 中铁上海工程局集团市政环保工程有限公司 201906 同济大学长江水环境教育部重点实验室上海200092

供水管网末梢水水质生物安全问题受到了广泛关注。采用生物膜环状反应器(BAR)模拟实际供水管网,探究了自来水和金属膜滤后水(膜滤水)对5种管材管壁生物膜影响的异同性。结果表明,金属膜过滤工艺对水中浑浊度、溶解性有机碳的平均去除率... 详细信息

供水管网末梢水水质生物安全问题受到了广泛关注。采用生物膜环状反应器(BAR)模拟实际供水管网,探究了自来水和金属膜滤后水(膜滤水)对5种管材管壁生物膜影响的异同性。结果表明,金属膜过滤工艺对水中浑浊度、溶解性有机碳的平均去除率分别为93.4%、19.0%;5种管材管壁生物膜在生长稳定期的生物量排序为铜<不锈钢≈聚氯乙烯(PVC)≈高密度聚乙烯(HDPE)<球墨铸铁;自来水体系中反应器进出水平均浑浊度分别为1.52、3.44 NTU,而膜滤水体系反应器进出水平均浑浊度分别为0.10、0.42 NTU,且各管材管壁生物膜生长缓慢。这是因为膜滤水体系微生物群落物种丰富度较低,管壁生物膜样品的OTU数减少了39.7%~56.5%,耐氯致病菌(分枝杆菌、甲基杆菌等)相对丰度明显减少。因此,金属膜过滤工艺可有效保障供水管网饮用水水质生物稳定性。

关键词：金属膜生物膜环状反应器供水管材生物稳定性分子生物学

Comprehensive integrated analysis of MR and DCE-MR radiomics models for prognostic prediction in nasopharyngeal carcinoma

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Visual Computing for Industry,Biomedicine,and Art 2023年第1期6卷 329-342页

作者： Hailin Li weiyuan Huang Siwen wang Priya SBalasubramanian Gang Wu Mengjie Fang Xuebin Xie Jie Zhang Di dong Jie Tian Feng Chen Beijing Advanced Innovation Center for Big Data-Based Precision Medicine School of Medicine and EngineeringBeihang UniversityBeijing 100191China CAS Key Laboratory of Molecular Imaging Institute of AutomationChinese Academy of SciencesBeijing 100190China Department of Radiology Hainan General Hospital(Hainan Affiliated Hospital of Hainan Medical University)HaikouHainan 570311China School of Artificial Intelligence University of Chinese Academy of SciencesBeijing 100049China Department of Psychiatry Weill Cornell MedicineNew YorkNY 10065USA Department of Radiotherapy Hainan General Hospital(Hainan Affiliated Hospital of Hainan Medical University)HaikouHainan 570311China Department of Radiology Kiang Wu HospitalSanto AntónioMacao 999078China Department of Radiology Zhuhai People’s Hospital(Zhuhai Hospital Affiliated With Jinan University)ZhuhaiGuangdong 519000China Engineering Research Center of Molecular and Neuro Imaging of Ministry of Education School of Life Science and TechnologyXidian UniversityXi’anShaanxi 710126China Zhuhai Precision Medical Center Zhuhai People’s HospitalZhuhaiGuangdong 519000China.

Although prognostic prediction of nasopharyngeal carcinoma (NPC) remains a pivotal research area, the role of dynamic contrast-enhanced magnetic resonance (DCE-MR) has been less explored. This study aimed to investigate the role of DCR-MR in predicting progression-free survival (PFS) in patients with NPC using magnetic resonance (MR)- and DCE-MR-based radiomic models. A total of 434 patients with two MR scanning sequences were included. The MR- and DCE-MR-based radiomics models were developed based on 289 patients with only MR scanning sequences and 145 patients with four additional pharmacokinetic parameters (volume fraction of extravascular extracellular space (ve), volume fraction of plasma space (vp), volume transfer constant (Ktrans), and reverse reflux rate constant (kep) of DCE-MR. A combined model integrating MR and DCE-MR was constructed. Utilizing methods such as correlation analysis, least absolute shrinkage and selection operator regression, and multivariate Cox proportional hazards regression, we built the radiomics models. Finally, we calculated the net reclassification index and C-index to evaluate and compare the prognostic performance of the radiomics models. Kaplan-Meier survival curve analysis was performed to investigate the model’s ability to stratify risk in patients with NPC. The integration of MR and DCE-MR radiomic features significantly enhanced prognostic prediction performance compared to MR- and DCE-MR-based models, evidenced by a test set C-index of 0.808 vs 0.729 and 0.731, respectively. The combined radiomics model improved net reclassification by 22.9%-52.6% and could significantly stratify the risk levels of patients with NPC (p = 0.036). Furthermore, the MR-based radiomic feature maps achieved similar results to the DCE-MR pharmacokinetic parameters in terms of reflecting the underlying angiogenesis information in NPC. Compared to conventional MR-based radiomics models, the combined radiomics model integrating MR and DCE-MR showed

关键词： Dynamic contrast-enhanced magnetic resonance imaging Magnetic resonance imaging Radiomics Prognostic prediction