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Effect of Nb-content on the corrosion resistance of Co-free high entropy alloys in chloride environment

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Tungsten 2024年第4期6卷 778-793页

作者： peng-fei dai Yang Zhang Sergey Rogozhkin Ji-Hong Han Shu-Wen Li Zhong-Wu Zhang Key Laboratory of Superlight Materials and Surface Technology Ministry of EducationCollege of Materials Science and Chemical EngineeringHarbin Engineering UniversityHarbin150001China National Research Nuclear University“MEPhI” Moscow115409Russia National Research Center“Kurchatov Institute” Moscow123182Russia

This study investigated the effect of Nb-content on the corrosion behavior of the Al_(7)Cr_(20)Fe_(35-x)Ni_(35)Mo_(3)Nb_(x)(x=0,1 and 2)high-entropy alloys in a *** results indicated that only the face centered cubic phase existed in the NbO and Nbl alloys,while the emergence of Laves phase was observed when Nb-content reached 2 at.%.The NbO and Nb1alloys exhibited pitting corrosion,while the NiAl-rich phase experienced localized preferential corrosion in the Nb2 *** electrochemical results revealed that the corrosion current density of the Nbx(x=0,1 and 2)alloys fell within the range of 10^(-8)-10-7 A·cm^(-2),with a pitting corrosion potential exceeding 700 ***,the Nb1 alloy exhibited the most impressive corrosion resistance,as its corrosion current density(7×10^(-8)A·cm^(-2))was merely half that of 316LN stainless *** is attributed to its rapid passivation process,resulting in the development of a protective film characterized by an increased Cr_(2)O_(3)/Al_(2)O_(3)+Cr(OH)_(3)*** study highlighted that the addition of Nb contributed to gram refinement,decreased corrosion current density,and elevated pitting potential,favoring passivation and improving corrosion ***,excessive Nb-content resulted in the emergence of the Laves phase,inducing galvanic corrosion and diminishing resistance to corrosion.

关键词： High entropy alloys Microstructure Corrosion Passive film Niobium

Preventing crash in stock market:The role of economic policy uncertainty during COVID‑19

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Financial Innovation 2021年第1期7卷 654-668页

作者： peng‑fei dai Xiong Xiong Zhifeng Liu Toan Luu Duc Huynh Jianjun Sun College of Management and Economics Tianjin UniversityTianjinChina School of Business East China University of Science and TechnologyShanghaiChina Management School Hainan UniversityHaikouChina Chair of Behavioral Finance WHU-Otto Beisheim School of ManagementVallendarGermany School of Banking University of Economics Ho Chi Minh CityHo Chi Minh CityVietnam School of Economics Hainan UniversityHaikouChina

This paper investigates the impact of economic policy uncertainty(EPU)on the crash risk of US stock market during the COVID-19 *** this end,we use the GARCHS(GARCH with skewness)model to estimate daily skewness as a proxy for the stock market crash *** empirical results show the significantly negative correlation between EPU and stock market crash risk,indicating the aggravation of EPU increase the crash ***,the negative correlation gets stronger after the global COVID-19 outbreak,which shows the crash risk of the US stock market will be more affected by EPU during the epidemic.

关键词： COVID-19 Economic policy uncertainty Crash risk Skewness

Cloaking an object in a half space without reflection

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Chinese Physics B 2013年第5期22卷 295-298页

作者：郭鹏斐李杜戴晴付云起 College of Electronic Science and Engineering National University of Defense Technology

A novel cloaking scheme to hide an object in a half space from electromagnetic （EM） detection without reflection is firstly presented. The proposed cloaking scheme contains a couple of matching strips, which consist of an isotropic material layer and an anisotropic UPML layer, located right under the bottom surface of a semi-cylindrical cloaking shell. Simple expressions for the material parameters of the cloaking scheme are derived. Numerical simulations are also performed, and a good cloaking effect is achieved. The cloaking scheme is effective to hide the local object with strong scattering characters placed on mobile carders, such as the radar antenna system on an aircraft.

关键词： invisibility cloak half space matching strips reflection

A Multi-Objective Particle Swarm Optimization Algorithm Based on Decomposition and Multi-Selection Strategy

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Computers, Materials & Continua 2025年第1期82卷 997-1026页

作者： Li Ma Cai dai Xingsi Xue Cheng peng School of Computer Science Shaanxi Normal UniversityXi’an710119China Fujian Provincial Key Laboratory of Big Data Mining and Applications Fujian University of TechnologyFuzhou350118China Information Construction and Management Center and Institute of Artificial Intelligence and Educational New Productivity Ningxia Normal UniversityGuyuan756099China

The multi-objective particle swarm optimization algorithm(MOPSO)is widely used to solve multi-objective optimization *** the article,amulti-objective particle swarm optimization algorithmbased on decomposition and multi-selection strategy is proposed to improve the search ***,two update strategies based on decomposition are used to update the evolving population and external archive,***,a multiselection strategy is *** first strategy is for the subspace without a non-dominated *** the neighbor particles,the particle with the smallest penalty-based boundary intersection value is selected as the global optimal solution and the particle far away fromthe search particle and the global optimal solution is selected as the personal optimal solution to enhance global *** second strategy is for the subspace with a non-dominated *** the neighbor particles,two particles are randomly selected,one as the global optimal solution and the other as the personal optimal solution,to enhance local *** third strategy is for Pareto optimal front(PF)discontinuity,which is identified by the cumulative number of iterations of the subspace without non-dominated *** the subsequent iteration,a new probability distribution is used to select from the remaining subspaces to ***,an adaptive inertia weight update strategy based on the dominated degree is designed to further improve the search ***,the proposed algorithmis compared with fivemulti-objective particle swarm optimization algorithms and five multi-objective evolutionary algorithms on 22 test *** results show that the proposed algorithm has better performance.

关键词： Multi-objective optimization multi-objective particle swarm optimization decomposition multi-selection strategy

Activation of adult endogenous neurogenesis by a hyaluronic acid collagen gel containing basic fibroblast growth factor promotes remodeling and functional recovery of the injured cerebral cortex

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Neural Regeneration Research 2025年第10期20卷 2923-2937页

作者： Yan Li peng Hao Hongmei Duan fei Hao Wen Zhao Yudan Gao Zhaoyang Yang Kwok-Fai So Xiaoguang Li Department of Neurobiology School of Basic Medical SciencesCapital Medical UniversityBeijingChina China Rehabilitation Science Institute China Rehabilitation Research CenterBeijing Key Laboratory of Neural Injury and RehabilitationBeijingChina Center of Neural Injury and Repair Beijing Institute for Brain DisordersBeijingChina Beijing Key Laboratory for Biomaterials and Neural Regeneration School of Engineering MedicineBeihang UniversityBeijingChina Guangdong-HongKong-Macao Institute of CNS Regeneration Ministry of Education CNS Regeneration Collaborative Joint LaboratoryJinan UniversityGuangzhouGuangdong ProvinceChina Bioland Laboratory(Guangzhou Regenerative Medicine and Health Guangdong Laboratory) GuangzhouGuangdong ProvinceChina Department of Ophthalmology and State Key Laboratory of Brain and Cognitive Sciences The University of Hong KongHong Kong Special Administration RegionChina Center for Brain Science and Brain-Inspired Intelligence Guangdong-HongKong-Macao Greater Bay AreaGuangzhouGuangdong ProvinceChina Co-innovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Biomedical Engineering School of Biological Science and Medical EngineeringBeihang UniversityBeijingChina

The presence of endogenous neural stem/progenitor cells in the adult mammalian brain suggests that the central nervous system can be repaired and regenerated after ***,whether it is possible to stimulate neurogenesis and reconstruct cortical layers II to VI in non-neurogenic regions,such as the cortex,remains *** this study,we implanted a hyaluronic acid collagen gel loaded with basic fibroblast growth factor into the motor cortex immediately following traumatic *** findings reveal that this gel effectively stimulated the proliferation and migration of endogenous neural stem/progenitor cells,as well as their differentiation into mature and functionally integrated ***,these new neurons reconstructed the architecture of cortical layers II to VI,integrated into the existing neural circuitry,and ultimately led to improved brain *** findings offer novel insight into potential clinical treatments for traumatic cerebral cortex injuries.

关键词： adult endogenous neurogenesis basic fibroblast growth factor-hyaluronic acid collagen gel cortical remodeling functional recovery migration motor cortex injury neural circuits neural stem cells newborn neurons proliferation

Crystallization Modulation and Holistic Passivation Enables Efficient Two‑Terminal Perovskite/CuIn(Ga)Se_(2)Tandem Solar Cells

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Nano-Micro Letters 2025年第1期17卷 205-215页

作者： Cong Geng Kuanxiang Zhang Changhua Wang Chung Hsien Wu Jiwen Jiang fei Long Liyuan Han Qifeng Han Yi‑Bing Cheng Yong peng State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070People’s Republic of China Triumph Photovoltaic Materials Co. Ltd.No.1001 Yannan AvenueHigh‑Tech Development DistrictBengbuAnhui 233000People’s Republic of China College of Materials Science and Engineering Guilin University of TechnologyGuilin 541004People’s Republic of China State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong UniversityShanghai 200240People’s Republic of China

Two-terminal(2-T)perovskite(PVK)/CuIn(Ga)Se_(2)(CIGS)tandem solar cells(TSCs)have been considered as an ideal tandem cell because of their best bandgap matching regarding to Shockley–Queisser(S–Q)***,the nature of the irregular rough morphology of commercial CIGS prevents people from improving tandem device *** this paper,D-homoserine lactone hydrochloride is proven to improve coverage of PVK materials on irregular rough CIGS surfaces and also passivate bulk defects by modulating the growth of PVK *** addition,the minority carriers near the PVK/C60 interface and the incompletely passivated trap states caused interface recombination.A surface reconstruction with 2-thiopheneethylammonium iodide and N,N-dimethylformamide assisted passivates the defect sites located at the surface and grain ***,LiF is used to create this field effect,repelling hole carriers away from the PVK and C60 interface and thus reducing *** a result,a 2-T PVK/CIGS tandem yielded a power conversion efficiency of 24.6%(0.16 cm^(2)),one of the highest results for 2-T PVK/CIGS TSCs to our *** validation underscores the potential of our methodology in achieving superior performance in PVK/CIGS tandem solar cells.

关键词： PVK/CIGS TSCs Irregular rough surfaces Modulating the growth PVK/C60 interface recombination

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陕西及其周边地区眼外伤流行病学分析

国际眼科杂志 2022年第2期22卷 352-356页

作者：杨文戴鹏飞薛大喜常花蕾陈涛中国陕西省西安市人民医院(西安市第四医院)眼科 710004

目的:分析陕西及其周边地区眼外伤流行病学及临床特征,为眼外伤防治措施的制定提供研究支持。方法:回顾性研究。收集2018-01/2020-04前来本院急诊就诊,并收住入院的单眼眼外伤患者1723例1723眼一般资料及临床资料并建立眼外伤数据库,对... 详细信息

目的:分析陕西及其周边地区眼外伤流行病学及临床特征,为眼外伤防治措施的制定提供研究支持。方法:回顾性研究。收集2018-01/2020-04前来本院急诊就诊,并收住入院的单眼眼外伤患者1723例1723眼一般资料及临床资料并建立眼外伤数据库,对陕西及周边地区眼外伤流行病学特征进行总结分析。结果:在1723眼外伤中,以中青年患者(20~59岁)居多(1149眼,66.69%),男性患者为主(1392眼,80.79%),绝大多数患者来自农村(1270眼,73.71%),从事体力劳动(1288眼,74.75%);眼外伤的主要致伤因素有钝器(511眼,29.66%)、锐器(423眼,24.55%)、飞溅金属异物(非金属)(299眼,17.35%)、摔倒(183眼,10.62%),其主要致伤场所有工作单位(633眼,36.74%)、农耕场所(474眼,27.51%)、住宅家庭(302眼,17.53%)、公共场所(248眼,14.39%),其主要类型为开放性眼外伤(1311眼,76.09%),主要治疗措施是手术治疗(1638眼,95.07%);Logistic分析显示年龄、伤后就诊时间、眼外伤类型、眼外伤并发症、眼外伤史均是影响眼外伤预后的重要因素(P<0.05)。结论:陕西及周边地区眼外伤发生情况具有年龄、性别、居住地及职业聚集性。针对特殊职业、特殊人群需及时采取针对性健康宣教和防治措施以降低眼外伤发生率,此外眼外伤患者的及时就诊有助于改善预后。

关键词：眼外伤致伤原因流行病学防治措施

强脉冲光联合睑板腺按摩与眼睑熏蒸按摩治疗MGD相关干眼的疗效对比

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国际眼科杂志 2019年第12期19卷 2101-2106页

作者：戴鹏飞李颖田芳王玉倩倪珊珊王洁中国陕西省西安市第四医院眼科

目的:观察对比强脉冲光(IPL)联合睑板腺按摩与眼睑熏蒸按摩对睑板腺功能障碍(MGD)相关干眼的治疗效果。方法:本研究为前瞻性随机对照临床试验。选取2018-03/08在西安市第四医院干眼门诊就诊的73例146眼MGD相关干眼患者,试验组38例76眼,... 详细信息

目的:观察对比强脉冲光(IPL)联合睑板腺按摩与眼睑熏蒸按摩对睑板腺功能障碍(MGD)相关干眼的治疗效果。方法:本研究为前瞻性随机对照临床试验。选取2018-03/08在西安市第四医院干眼门诊就诊的73例146眼MGD相关干眼患者,试验组38例76眼,给予IPL联合睑板腺按摩治疗(每3wk 1次,共3次)。对照组35例70眼给予眼睑熏蒸联合睑板腺按摩治疗(每天熏蒸、清洗睑缘,连续5d,第5d进行睑板腺按摩,间隔2wk后再次重复治疗,共3次)。本研究时间共12wk,记录首次治疗前及首次治疗后1、4、7、12wk时患者的眼表疾病指数(OSDI)评估、标准干眼评估问卷(SPEED)、非侵入泪膜破裂时间(NITBUT)、非侵入泪河高度测量(NITMH)、睑板腺缺失积分(MGS)、睑板腺分泌物评估(MGYSS)等数据,评估两种治疗方法的有效性及二者的疗效对比。结果:两组间性别、年龄无差异(P>0.05)。两组治疗前各观察指标无差异(P>0.05);两组治疗后各时间点除NITMH、MGS外各项指标均较治疗前有明显改善(P0.05);试验组在治疗后4、7、12wk时,除NITMH、MGS外均优于对照组(P<0.05)。从指标变化趋势上看,试验组于首次治疗后疗效指标持续好转,于第12wk时疗效最佳,而对照组于首次治疗后第7wk疗效最佳,之后疗效减弱。治疗后两组均未见明显并发症。结论:强脉冲光联合睑板腺按摩及眼睑熏蒸按摩两种治疗方式均对MGD相关干眼治疗方便、安全、有效,且强脉冲光联合睑板腺按摩疗效及维持时间优于眼睑熏蒸按摩治疗。

关键词：强脉冲光睑板腺按摩睑板腺功能障碍干眼治疗效果对比

茶树油眼贴联合睑缘深度清洁治疗蠕形螨睑缘炎的临床疗效

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国际眼科杂志 2020年第10期20卷 1791-1796页

作者：王玉倩李颖戴鹏飞田芳王洁倪珊珊中国陕西省西安市人民医院(西安市第四医院)陕西省眼科医院西北工业大学附属医院 710004

目的:观察茶树油眼贴联合睑缘深度清洁对蠕形螨睑缘炎的临床治疗效果。方法:前瞻性随机双眼对照临床研究。收集2018-11/2019-05就诊西安市人民医院(西安市第四医院)干眼门诊的蠕形螨睑缘炎患者32例64眼,男14例,女18例,年龄12~65(平均37... 详细信息

目的:观察茶树油眼贴联合睑缘深度清洁对蠕形螨睑缘炎的临床治疗效果。方法:前瞻性随机双眼对照临床研究。收集2018-11/2019-05就诊西安市人民医院(西安市第四医院)干眼门诊的蠕形螨睑缘炎患者32例64眼,男14例,女18例,年龄12~65(平均37±14)岁。采用随机法将受试者的一只眼纳入研究组,另一只眼纳入对照组。研究组采用茶树油眼贴治疗(1次/d)联合睑缘深度清洁(1次/mo),对照组仅使用茶树油眼贴治疗。记录两组治疗前、治疗3mo后受试者的主观症状、蠕形螨计数、睑缘清洁程度、睑缘异常、首次非侵入式泪膜破裂时间(NITBUT-first)、泪河高度(TMH)、眼红指数(Redness)、睑板腺红外线照相检查、泪液分泌试验(SⅠt)、角膜染色(FL)结果。结果:治疗3mo后,两组蠕形螨计数均较治疗前明显下降,研究组蠕形螨计数低于对照组(均P<0.05);两组睑缘清洁程度均得到明显改善,且研究组评分低于对照组(均P<0.05);两组受试者主观症状评分明显改善(均P<0.05)。治疗3mo后,研究组NITBUT-first、眼红指数、FL均得到明显改善(均P<0.05),对照组眼红指数、FL得到明显改善(均P<0.05),NITBUT-first中位数较治疗前有所增加,但差异无统计学意义;两组间眼表泪液指标的改善程度、TMH、SⅠt均无明显变化。睑板腺缺失程度评分(MGS)在治疗前后及两组间均无明显差异。受试者治疗过程中未出现接触性皮炎、过敏反应、角结膜损伤等相关并发症。结论:茶树油眼贴贴敷双眼,可明显降低睫毛毛囊蠕形螨数量、减少鳞屑,改善患者症状、增加泪膜稳定性、减轻眼表炎症;睑缘深度清洁可进一步清除睑缘袖套状鳞屑,维持睑缘清洁程度,改善睑缘异常,从而加强茶树油眼贴的除螨效果。茶树油眼贴联合睑缘深度清洁治疗蠕形螨睑缘炎,是一种简便易行、安全有效的治疗方式。

关键词：茶树油睑缘深度清洁蠕形螨睑缘炎治疗