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Improving fatigue properties of normal direction ultrasonic vibration assisted face grinding Inconel 718 by regulating machined surface integrity

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International Journal of Extreme Manufacturing 2024年第3期6卷 458-475页

作者： Nianwei Xu Renke Kang Bi Zhang Yuan Zhang Chenxu Wang yan bao Zhigang Dong State Key Laboratory of High-Performance Precision Manufacturing Dalian University of TechnologyDalian 116024People’s Republic of China Department of Mechanical and Energy Engineering Southern University of Science and TechnologyShenzhen 518055People’s Republic of China

Fatigue properties are crucial for critical aero-engine components in extreme serviceenvironments,which are significantly affected by surface integrity(SI)indexes(especially surface topography,residual stressσ_(res),and microhardness)after machining ***-direction ultrasonic vibration-assisted face grinding(ND-UVAFG)has advantages in improving the machinability of Inconel 718,but there is a competitive relationship between higher compressiveσ_(res)and higher surface roughness R_(a)in affecting fatigue *** lack of a quantitative relationship between multiple SI indexes and fatigue strength makes theindeterminacy of a regulatory strategy for improving fatigue *** this work,a model of fatigue strength(σ_f)_(sur)considering multiple SI indexes was ***,high-cycle fatigue tests were carried out on Inconel 718 samples with different SI characteristics,and the influence of ND-UVAFG process parameters on SI was *** on SI indexes data,the(σ_f)_(sur)distribution in the grinding surface layer for ND-UVAFG Inconel 718 samples was determined using the developed model,and then the fatigue crack initiation(FCI)sites were *** predicted FCI sites corresponded well with the experimental results,therebyverifying this model.A strategy for improving the fatigue life was proposed in this work,which was to transfer the fatigue source from the machined surface to the bulk material by controlling the SI ***,a critical condition of SI indexes that FCI sites appeared on the surface or in bulk material was given by fitting the predicted *** to the critical condition,an SI field where FCI sites appeared in the bulk material could be *** this field,thefatigue life of Inconel 718 samples could be improved by approximately 140%.

关键词： surface integrity fatigue strength Inconel 718 ultrasonic assisted grinding

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Optimal V_(2)O_(3) extraction by sustainable vanadate electrolysis in molten salts

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Tungsten 2024年第1期6卷 141-149页

作者： bao-yan Feng Zhong-Hua Zhao Yong-Zheng Jia Jia-Liang An Ming-Yong Wang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China Beijing Key Laboratory of Green Recovery and Extraction of Rare and Precious Metals University of Science and Technology BeijingBeijing 100083China

Recently,an environmentally friendly electrolysis process of soluble vanadates is proposed and successfully confirmed for V_(2)O_(3) *** this paper,the solubilities of various vanadates(***_(3),Na_(4)V_(2)O_(7) and Na_(3)VO_(4))in NaCl molten salt are *** dependences of V_(2)O_(3) extraction on vanadate form,anode material and molten salt system are studied.A long-term electrolysis is carried *** result indicates that the solubilities of all vanadates are high and meet electrolytic *** to Na_(4)V_(2)O_(7) and Na_(3)VO_(4),NaVO_(3) exhibits larger current efficiency and lower electricity *** using SnO_(2) anode instead of graphite anode,the current efficiency of NaVO_(3) electrolysis can be increased to 58.1%and carbon pollution is avoided at 700℃.The extraction rate of V_(2)O_(3) reaches 81.3%after long-term electrolysis of 51 *** work optimizes the electrochemical preparation process of V_(2)O_(3) from various vanadates and contributes to the improvement of current efficiency and extraction rate.

关键词： Molten salt electrolysis Vanadate Vanadium trioxide Current efficiency

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Laser-assisted grinding of RB-SiC composites:Laser ablation behavior and mechanism

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Chinese Journal of Aeronautics 2024年第1期37卷 362-376页

作者： Zhigang DONG Wenchao SUN Xintong CAI Feng yanG yan bao Renke KANG Dongjiang WU Guangyi MA Fangyong NIU Key Laboratory for Precision and Non-traditional Machining Technology of the Ministry of Education School of Mechanical EngineeringDalian University of TechnologyDalian 116024China

Laser ablation is an important process during Laser-Assisted Grinding(LAG)of hard and brittle *** realize controllable material removal during laser ablation of RB-SiC composites,ablation experiments under different Laser Energy Density(LAED)and LAG experiments are *** rules and mechanism of physical phase,ablation morphology and crack characteristics caused by laser irradiation are *** forces of LAG and Conventional Grinding(CG)are *** results show that ablation surface changes from slight oxidation to obvious material removal with LAED increasing,and ablation depth increases *** ablation products change from submicron SiO_(2)particles to nanoscale particles and *** LAED promotes SiC decomposition and sublimation,which leads to the increase of C *** SiC phase forms corrugated shape in recast layer and columnar shape in Heat Affected Zone(HAZ)at 56 J/mm^(2).The cold and heat cycle leads to formation of fishbone *** ablation specimen under 30 J/mm^(2),the grinding force can be reduced by a maximum of 39%and brittle damage region is *** material removal and microcrack generated will significantly reduce the hardness and improve machinability,which can promote grinding efficiency.

关键词： RB-SiC Laser Ceramic Composites Grinding

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Enhanced preparation of dendritic metallic vanadium in recyclable NaCl-KCl-VCl2 molten salt by V2CO electrolysis

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Rare Metals 2024年第08期43卷 3961-3973页

作者： Jia-Liang An Ming-Yong Wang Yong-Zheng Jia Jin-Tao Zhang bao-yan Feng Shu-Qiang Jiao State Key Laboratory of Advanced Metallurgy University of Science and Technology Beijing College of Material Science and Engineering Hebei Province Laboratory of Inorganic Nonmetallic MaterialsNorth China University of Science and Technology

A promising method for the preparation of pure metallic vanadium via V2CO anode electrolysis was proposed and *** simple and controllable synthesis of a molten chloride salt containing VCl2by an insitu reaction between VCl3and metallic vanadium was verified through thermodynamic analysis and ***-KCl-VCl2molten salt exhibited excellent recycling performance and could be repetitively used to prepare metallic vanadium by V2CO *** V2+ions remained in the molten salt after *** electrolysis conditions,such as the cathode diameter,current density,V2+ion concentration,and temperature,were optimised to maximise the current *** was also simulated to reveal the regulatory *** highest current efficiency was 85%.The purity of metallic vanadium was up to 99.8%.In this study,an easy and efficient preparation of pure metallic vanadium was achieved.

关键词： V 2 CO Metallic vanadium Current efficiency Molten salt electrolysis

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Experience of humanistic nursing in hemodialysis nursing for patients with diabetic kidney disease

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World Journal of Diabetes 2024年第2期15卷 186-195页

作者： Xiao-Ying Chai Xiao-yan bao Ying Dai Xing-Xing Dai Yu Zhang Yu-Ling yang Department of Nephrology The Affiliated Hospital of Jiangnan UniversityWuxi 214000Jiangsu ProvinceChina Department of Hemodialysis The Affiliated Hospital of Jiangnan UniversityWuxi 214000Jiangsu ProvinceChina Department of Endocrinology The Affiliated Hospital of Jiangnan UniversityWuxi 214000Jiangsu ProvinceChina

BACKGROUND Diabetic kidney disease(DKD)is a prevalent complication of diabetes that often requires hemodialysis for *** the field of nursing,there is a growing recognition of the importance of humanistic care,which focuses on the holistic needs of patients,including their emotional,psychological,and social ***,the application of humanistic nursing in the context of hemodialysis for DKD patients remains relatively *** To explore the experience of humanistic nursing in hemodialysis nursing for DKD *** Ninety-six DKD patients treated with hemodialysis from March 2020 to June 2022 were included in the study and divided into the control cluster(48 cases)and the study cluster(48 cases)according to different nursing methods;the control cluster was given routine nursing and the study cluster was given humanized *** variances of negative emotion mark,blood glucose,renal function,the incidence of complications,life mark and nursing satisfaction before and after nur-sing were contrasted between the two *** No significant difference in negative emotion markers between the two clusters were observed before nursing(P>0.05),and the negative emotion markers of the two clusters decreased after *** Hamilton Anxiety Rating Scale and Hamilton Depression Rating Scale markers were lower in the study cluster than the control *** healing rate of patients in the study cluster was significantly higher than the control cluster(97.92%vs 85.42%,P0.05).However,after nursing,blood urea nitrogen and serum creatinine(SCr)levels in the study cluster were lower than those in the control cluster(P<0.05).The incidence rate of complications was significantly lower in the study group compared to the control cluster(6.25%vs 20.83%,P<0.05).There was no significant difference in the life markers between the two clusters be

关键词： Diabetic kidney disease Hemodialysis Humanistic nursing Incidence of complication Effect

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功能性Janus纳米颗粒的研究进展

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精细化工 2024年第4期41卷 697-706,739页

作者：鲍艳项茹陕西科技大学轻工科学与工程学院陕西西安710021 轻化工程国家级实验教学示范中心陕西西安710021

Janus纳米颗粒是一类在空间或物化性质上各向异性的纳米材料,因其独特的性质和在功能涂层、环境、催化、生物医学等领域的应用而受到广泛关注。不同纳米颗粒的侧边分布为定制具备丰富功能的Janus纳米颗粒提供了一个灵活的平台,与传统均... 详细信息

Janus纳米颗粒是一类在空间或物化性质上各向异性的纳米材料,因其独特的性质和在功能涂层、环境、催化、生物医学等领域的应用而受到广泛关注。不同纳米颗粒的侧边分布为定制具备丰富功能的Janus纳米颗粒提供了一个灵活的平台,与传统均质纳米颗粒相比,功能性Janus纳米颗粒凭借两种功能或多种功能的结合拓展了更多的新兴应用领域。该文重点讨论了磁响应性、光催化性、非对称浸润性及自驱动性等功能性Janus纳米颗粒的制备策略;同时介绍了功能性Janus纳米颗粒的应用领域,并对其存在的问题进行分析讨论;最后,对功能性Janus纳米颗粒合成和应用前景进行了展望。

关键词：功能性Janus纳米颗粒磁响应催化非对称浸润性自驱动性

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如何“过日子”:河南刘村笔匠农工相辅的日常生活分析

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北方民族大学学报（哲学社会科学版） 2024年第3期 114-122页

作者：包艳杰青岛农业大学人文社会科学学院山东青岛266109 中国人民大学社会与人口学院北京100872

出于生计和文化认同对土地的依赖,农民很大程度上希望能够依靠务农过日子,但现实中往往又面临人多地狭的矛盾,所以为了过日子,人们往往经营着多样的生计,即费孝通所说的“农工相辅”概念。这些家庭副业突破既有的生活模式,以“不过日子... 详细信息

出于生计和文化认同对土地的依赖,农民很大程度上希望能够依靠务农过日子,但现实中往往又面临人多地狭的矛盾,所以为了过日子,人们往往经营着多样的生计,即费孝通所说的“农工相辅”概念。这些家庭副业突破既有的生活模式,以“不过日子”的形式动态维持着农民们的“过日子”。“不过日子”在本质上是突破了乡土性的一种生计方式,成为打破乡村闭合性的一个内在隐性因子,并作为一种内在改变的力量成为乡村实现自我创造性转化的关键。在刘村,以毛笔为连接点,农民日常生活与中华优秀传统文化悄然融合在一起,成为乡村文化转型的珍贵个案,值得当下各种乡村建设的探索实践予以重视。

关键词： “不过日子” “过日子” 制笔业传统手工艺乡村建设

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Efficacy of Pudilan Xiaoyan Oral Liquid in the treatment of pneumonia induced by drug-resistant Pseudomonas aeruginosa

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Infectious Diseases Research 2024年第3期5卷 22-29页

作者： Jing Ma yan-yan bao Xiao-Rui Wang Kuok Kuantai Leong-Man Chon Xiao-Lan Cui Ju-Ying Zhong Yu-Jing Shi Institute of Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China Conde S.Januário Hospital(CHCSJ) pharmacy departmentMacao 999078China Lin Fong Charities Traditional Chinese Medicine Treatment Centre Macao 999078China Experimental Research Center China Academy of Chinese Medical SciencesBeijing 100700China

Background:Pudilan Xiaoyan Oral Liquid(PDL)is a Chinese patent medicine with notable pharmacological properties,including anti-inflammatory and antibacterial ***-resistant Pseudomonas aeruginosa infection is a common and refractory bacterial infection in clinical *** to its high drug resistance,it brings great challenges to *** study aimed to assess the therapeutic efficacy of PDL in a murine model of pneumonia induced by drug-resistant Pseudomonas ***:Three different doses of PDL(11 mL/kg/d,5.5 mL/kg/d,2.75 mL/kg/d)were used to observe lung tissue pathology and inflammatory cytokine levels in pneumonia mouse models induced by multidrug-resistant Pseudomonas aeruginosa(MDR-PA).Additionally,the protective efficacy of PDL against mortality in infected mice was evaluated using a death model caused by *** sub-MIC concentration of levofloxacin was used to induce drug-resistant mice pneumonia model to evaluate the role of PDL in reversing drug *** data are expressed as mean±standard *** significance was determined by one-way analysis of variance followed by Tukey’s multiple-comparisons ***:Treatment effect of PDL on MDR-PA pneumonia:the medium and small doses of PDL can significantly reduce the lung index of multi-drug resistant bacteria infected pneumonia model mice(P<0.05),the lung index inhibition rates for these groups were 55.09%and 58.43%,and improve the degree of lung tissue lesions of mice;The expression of serum cytokines keratinocyte chemoattractant,tumor necrosis factor-αand monocyte chemoattractant protein-1 could be decreased in the three dosage groups of PDL(P<0.01).PDL treatment not only lowered the mortality but also extended the survival duration in mice infected with *** was found after sub-MIC concentration of levofloxacin induced resistance of Pseudomonas aeruginosa to pneumonia in *** with the model group,the lung index of mice in high

关键词： pudilan Pseudomonas aeruginosa drug resistance mice model

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基于机器学习的弯管固液两相流流动特性研究

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力学学报 2024年第3期56卷 613-625页

作者：肖盛鹏朱宏博周岱包艳上海交通大学船舶海洋与建筑工程学院上海200240

管道水力输送是工业中常见运输方式,具有运输距离长、安全性高、运营和维护成本低、环境友好和布置灵活的优点,当前关于管道系统内水平、倾斜和垂直管道的两相流流动特征研究较多,而关于系统内弯曲段管道研究较少,亟需明确该段的两相流... 详细信息

管道水力输送是工业中常见运输方式,具有运输距离长、安全性高、运营和维护成本低、环境友好和布置灵活的优点,当前关于管道系统内水平、倾斜和垂直管道的两相流流动特征研究较多,而关于系统内弯曲段管道研究较少,亟需明确该段的两相流流动机理及辨明该段的磨损机制,并作出准确预测.本研究首先采用欧拉-拉格朗日框架下的CFD-DEM耦合方法,针对弯曲管道压降和磨损率,探究了弯曲角度、弯曲半径、输入速度、颗粒直径和颗粒浓度等5个因素的影响;并基于上述5个变量,通过Pairwise配对法进行工况组合并进行数值模拟计算,得到数百个可用数据;基于此数据集,开发了6个机器学习模型进行训练,比较了各自模型的准确率并得到各特征对于预测结果的相对重要性.结果表明,弯管的压降随输入速度、颗粒浓度、颗粒直径和弯曲角度增大而增大,与弯曲半径关系较小;磨损率随输入速度、颗粒浓度、颗粒直径和弯曲半径的增大而增大,随弯曲角度的增大,在90°前先略有下降,在90°后增大.最佳的机器学习模型对压降和磨损率的预测准确率评估指标R2(越接近1越准确)分别在0.96和0.99左右,具有较好的预测能力,可用于多参数影响下的弯曲管道固液两相流水力压降及管壁磨损率的预测,且计算发现输入速度和颗粒浓度分别是对压降和磨损率预测的影响程度最大的因素.

关键词：弯管水力输送 CFD-DEM 机器学习压降磨损率

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静电纺丝阻燃纳米纤维的研究进展

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复合材料学报 2024年第6期41卷 2801-2814页

作者：鲍艳赵海航高璐张文博陕西科技大学轻工科学与工程学院(柔性电子学院) 西安710021 陕西科技大学轻化工程国家级实验教学示范中心西安710021

静电纺丝纳米纤维具有可调控的纤维直径和分布、相互连通的孔结构、高孔隙率、高比表面积、可控纤维堆积密度等优点,成为近年来研究的热点。阻燃性是高分子材料的重要特性,阻燃纤维相较普通纤维具有使用安全性高的特点,研发具有阻燃特... 详细信息

静电纺丝纳米纤维具有可调控的纤维直径和分布、相互连通的孔结构、高孔隙率、高比表面积、可控纤维堆积密度等优点,成为近年来研究的热点。阻燃性是高分子材料的重要特性,阻燃纤维相较普通纤维具有使用安全性高的特点,研发具有阻燃特性的纳米纤维具有重要意义。静电纺丝技术提供了将纳米颗粒结合到聚合物溶液中并获得具有多种功能复合纤维材料的可能性。基于此,本文综述了采用静电纺丝技术制备阻燃纳米纤维的研究进展,特别是对静电纺丝阻燃纳米纤维的结构进行了分类,主要包括共混结构、核-壳结构、并列结构和多孔结构,并总结了不同结构阻燃纳米纤维的优缺点。然后对静电纺丝阻燃纳米纤维在锂离子电池隔膜、空气过滤、火灾报警传感、防护材料等领域的应用进行了归纳,最后对静电纺丝阻燃纳米纤维未来的发展方向进行了展望。

关键词：静电纺丝阻燃纳米纤维结构应用

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