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Microstructure and wear resistance of AlCrFeNiMo_(0.5)Si_(x) high-entropy alloy coatings prepared by laser cladding

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China Foundry 2022年第6期19卷 473-480页

作者： xiao-cong li Hui liang Yan-zhou Zhao li Gao li Jiang Zhi-qiang Cao Key Laboratory of Solidification Control and Digital Preparation Technology(liaoning Province) School of Materials Science and EngineeringDalian University of TechnologyDalian 116024LiaoningChina School of Physics and Electronic Technology Liaoning Normal UniversityDalian 116029LiaoningChina

In recent years,the coating prepared by laser cladding has attracted much attention in the field of wear *** this work,AlCrFeNiMo_(0.5)Si_(x)(x=0,0.5,1.0,1.5,2.0)high-entropy alloy coatings were designed and prepared on Q235 steel by laser *** effect of Si content on microstructure,microhardness and wear resistance of the coatings was studied in *** results indicate that the AlCrFeNiMo_(0.5)Si_(x) highentropy alloy coatings show an excellent bonding between substrate and the cladding *** AlCrFeNiMo_(0.5)Si_(x) coatings are composed of nano-precipitated phase with BCC structure and matrix with ordered B2 *** the addition of Si,the white phase(Cr,Mo)_(3)Si with cubic structure appears in the interdendritic,and the morphology of the coating(x=2.0)transforms into lamellar eutectic-like *** addition of Si enhances the microhardness and significantly improves the wear resistance of the *** x increases from 0 to 2.0,the average hardness of the cladding zone increases from 632 HV to 835 HV,and the wear rate decreases from 1.64×10^(-5) mm^(3)·(N·m)^(-1) to 5.13×10^(-6) mm^(3)·(N·m)^(-1).When x≥1.5,the decreasing trend of the wear rate gradually slows *** wear rates of Si1.5 and Si2.0 coatings are 5.85×10^(-6) mm^(3)·(N·m)^(-1) and 5.13×10^(-6) mm^(3)·(N·m)^(-1),respectively,which is an order of magnitude lower than that of Q235 steel.

关键词： high-entropy alloy coatings laser cladding microstructure wear resistance

Rapid response to lipids profile and leukocyte gene expression after rosuvastatin administration in Chinese healthy volunteers

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Chinese Medical Journal 2008年第13期121卷 1215-1219页

作者： HUA cong-xiao li Yi-shi liU Yu-qing liU Hong li Na WU Ying XU li HUANG Yi-ling Key Laboratory of Clinical Trial Research in Cardiovascular Drugs Ministry of Health Beijing Fuwai Hospital Peking Union Medical College Chinese Academy of Medical Sciences Beijing 100037 China

Background Statins are potent lipid-lowering agents widely used in medical practice. There has been growing evidence suggesting the pleiotropic effects of statins in addition to the lipid-lowering effect. However, it is still unclear how rapidly the beneficial effects of statins occur. The transcriptome of peripheral blood cells can be used as a sensor to drug therapy. The purpose of the study was to investigate the acute effects of rosuvastatin both on lipids profile and gene expression of peripheral leukocytes following therapy with a single dose of rosuvastatin. Methods Thirty healthy Chinese male volunteers were enrolled. The serum lipids, high-sensitivity C-reactive protein, and plasma fibrinogen were determined before and 72 hours after administration of 20 mg of rosuvastatin. The differentially expressed genes of peripheral leukocytes after administration of rosuvastatin were screened using human oligonucleotide microarray gene expression chips. Then four of the differentially expressed genes including ATM, CASP8 IL8RB and SIOOB were verified by real-time polymerase chain reaction （PCR）. Results Rosuvastatin decreased both serum total cholesterol and low-density lipoprotein cholesterol significantly 72 hours after administration of a single dose of 20 mg rosuvastatin. However, no significant changes occurred in blood high-density lipoprotein cholesterol, triglycerides, C-reactive protein and fibrinogen after the treatment. A total of 24 genes were differentially expressed after the treatment. They were involved in important cell biological processes such as cytokine-cytokine receptor interaction, apoptosis signaling, etc. Conclusions Rosuvastatin rapidly modulates the serum lipids and affects the gene expression of peripheral leukocytes in healthy volunteers. This finding provides some new clues for further studies on its potential pleiotrooic effects.

关键词： rosuvastatin leukocytes microarray analysis gene expression

Modeling Research on Manufacturing Execution System Based on Large-scale System Cybernetics

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Journal of Shanghai Jiaotong university(Science) 2008年第6期13卷 744-747页

作者：吴瑜许晓栋李从心 Department of Plasticity Technology Shanghai Jiaotong UniversityShanghai 200030China

A cybernetics model of manufacturing execution system(MES CM) was proposed and studied from the viewpoint of *** with the features of manufacturing system, the MES CM was modeled by"generalized modeling"method that is discussed in large-scale system *** mathematical model of MES CM was constructed by the generalized operator model, and the main characteristics of MES CM were analyzed.

关键词： cybernetics manufacturing execution system large scale system

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社区体育生态化服务体系的构建

北京体育大学学报 2008年第9期31卷 1182-1184页

作者：宫晓丽山东财政学院体育教育学院山东济南250014

社区体育生态化服务体系的基本框架包括:组织保障体系、人才服务体系、体育活动的内容体系、体育设施网络系统、社区体育健身环境评价体系。

关键词：社区体育生态化服务体系

miRNA-21-5p is an important contributor to the promotion of injured peripheral nerve regeneration using hypoxia-pretreated bone marrow-derived neural crest cells

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Neural Regeneration Research 2025年第1期20卷 277-290页

作者： Meng cong Jing-Jing Hu Yan Yu xiao-li li xiao-Ting Sun li-Ting Wang Xia Wu ling-Jie Zhu xiao-Jia Yang Qian-Ru He Fei Ding Hai-Yan Shi School of Medicine Nantong UniversityNantongJiangsu ProvinceChina Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education and Coinnovation Center of Neuroregeneration Nantong UniversityNantongJiangsu ProvinceChina Department of Physiology Jiangsu Health Vocational CollegeNanjingJiangsu ProvinceChina Department of Pathology Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina Jiangsu Clinical Medicine Center of Tissue Engineering and Nerve Injury Repair Affiliated Hospital of Nantong UniversityNantongJiangsu ProvinceChina

Our previous study found that rat bone marrow–derived neural crest cells(acting as Schwann cell progenitors)have the potential to promote long-distance nerve ***-based therapy can enhance peripheral nerve repair and regeneration through paracrine bioactive factors and intercellular ***,the complex contributions of various types of soluble cytokines and extracellular vesicle cargos to the secretome remain *** investigate the role of the secretome and extracellular vesicles in repairing damaged peripheral nerves,we collected conditioned culture medium from hypoxia-pretreated neural crest cells,and found that it significantly promoted the repair of sensory neurons damaged by oxygen-glucose *** mRNA expression of trophic factors was highly expressed in hypoxia-pretreated neural crest *** performed RNA sequencing and bioinformatics analysis and found that miR-21-5p was enriched in hypoxia-pretreated extracellular vesicles of neural crest ***,to further clarify the role of hypoxia-pretreated neural crest cell extracellular vesicles rich in miR-21-5p in axonal growth and regeneration of sensory neurons,we used a microfluidic axonal dissociation model of sensory neurons in vitro,and found that hypoxia-pretreated neural crest cell extracellular vesicles promoted axonal growth and regeneration of sensory neurons,which was greatly dependent on loaded ***,we constructed a miR-21-5p-loaded neural conduit to repair the sciatic nerve defect in rats and found that the motor and sensory functions of injured rat hind limb,as well as muscle tissue morphology of the hind limbs,were obviously *** findings suggest that hypoxia-pretreated neural crest extracellular vesicles are natural nanoparticles rich in ***-21-5p is one of the main contributors to promoting nerve regeneration by the neural crest cell *** helps to explain the mechanism of action of the secretome and e

关键词： axotomy cell-free therapy conditioned medium extracellular vesicles hypoxic preconditioning microRNA oxygen-glucose deprivation peripheral nerve injury Schwann cell precursors

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环保型无氮自硬呋喃树脂砂粘结剂的制作应用

铸造技术 2006年第5期27卷 443-445页

作者：赵东方肖聪利李海凤北华航天工业学院材料系河北廊坊065000

介绍了基本上不含游离甲醛及游离苯酚含量很低的无氮自硬呋喃树脂砂粘结剂的制作方法和应用。这种粘结剂仍然使用甲醛、糠醇(呋喃甲醇)、苯酚等原料作为其合成树脂的主要材料,使用一种低分子物作为合成改性剂,采用适当的工艺制作而成,... 详细信息

介绍了基本上不含游离甲醛及游离苯酚含量很低的无氮自硬呋喃树脂砂粘结剂的制作方法和应用。这种粘结剂仍然使用甲醛、糠醇(呋喃甲醇)、苯酚等原料作为其合成树脂的主要材料,使用一种低分子物作为合成改性剂,采用适当的工艺制作而成,不改变树脂的性能,且树脂制作成本基本不变。该粘结剂的使用可在很大程度上降低铸件生产过程的游离甲醛和游离苯酚对生产环境和操作人员的污染和损害。

关键词：环境保护无氮自硬呋喃树脂砂粘结剂污染和损害

Design of a cationic accelerator enabling ultrafast ion diffusion kinetics in aqueous zinc-ion batteries

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Journal of Energy Chemistry 2025年第1期100卷 377-384页

作者： Yawei xiao Qianqian Gu Haoyu li Mengyao li Yude Wang National Center for International Research on Photoelectric and Energy Materials School of Materials and Energy Yunnan University Key Laboratory of Ministry of Education for Advanced Materials in Tropical Island Resources School of Chemistry and Chemical Engineering Hainan University College of Chemical Engineering Fuzhou University Yunnan Key Laboratory of Carbon Neutrality and Green Low-carbon Technologies Yunnan University

Aqueous zinc-ion batteries are highly favored for grid-level energy storage owing to their low cost and high safety,but their practical application is limited by slow ion *** address this,a strategy has been developed to create a cation-accelerating electric field on the surface of the cathode to achieve ultrafast Zn2+diffusion *** employing electrodeposition to coat MoS2on the surface of BaV6O16·3H2O nanowires,the directional built-in electric field generated at the heterointerface acts as a cation accelerator,continuously accelerating Zn2+diffusion into the active *** optimized Zn2+diffusion coefficient in CC@BaV-6O16·3H2O@MoS2(7.5×10～8cm2s-1) surpasses that of most reported V-based ***,MoS2serving as a cathodic armor extends the cycling life of the Zn-CC@BaV6O16·3H2O@MoS2full batteries to over 10000 *** work provides valuable insights into optimizing ion diffusion kinetics for high-performance energy storage devices.

关键词： Internal electric field Cationic accelerator Ion diffusion kinetics Cathode modification strategy Aqueous zinc ion battery

Overview of in-situ oxygen production technologies for lunar resources

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 233-255页

作者： Youpeng Xu Sheng Pang liangwei cong Guoyu Qian Dong Wang Laishi li Yusheng Wu Zhi Wang College of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China CAS Key Laboratory of Green Process and Engineering National Engineering Research Center for Green Recycling of Strategic Metal ResourcesInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China School of Chemical Engineering University of Chinese Academy of SciencesBeijing 100049China

The rich resources and unique environment of the Moon make it an ideal location for human expansion and the utilization of extraterrestrial ***,crucial for supporting human life on the Moon,can be extracted from lunar regolith,which is highly rich in oxygen and contains polymetallic *** oxygen and metal extraction can be achieved using existing metallurgical ***,the ample reserves of water ice on the Moon offer another means for oxygen *** paper offers a detailed overview of the leading technologies for achieving oxygen production on the Moon,drawing from an analysis of lunar resources and environmental *** delves into the principles,processes,advantages,and drawbacks of water-ice electrolysis,two-step oxygen production from lunar regolith,and one-step oxygen production from lunar *** two-step methods involve hydrogen reduction,carbothermal reduction,and hydrometallurgy,while the one-step methods encompass fluorination/chlorination,high-temperature decomposition,molten salt electrolysis,and molten regolith electrolysis(MOE).Following a thorough comparison of raw materials,equipment,technology,and economic viability,MOE is identified as the most promising approach for future in-situ oxygen production on the *** the corrosion characteristics of molten lunar regolith at high temperatures,along with the Moon's low-gravity environment,the development of inexpensive and stable inert anodes and electrolysis devices that can easily collect oxygen is critical for promoting MOE technology on the *** review significantly contributes to our understanding of in-situ oxygen production technologies on the Moon and supports upcoming lunar exploration initiatives.

关键词： lunar resources in-situ oxygen production space metallurgy molten lunar regolith electrolysis

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DPPA催化芴-9-羧酸的新颖脱羧反应

化学试剂 2012年第6期34卷 542-544页

作者：丛晓丽倪帅帅朱进华东理工大学药学院上海200237 民生药业滨江分公司浙江杭州310051

以0.096 mmol叠氮磷酸二苯酯(Diphenylphosphorazidate,DPPA)为催化剂,在极性溶剂和0.48 mmol的三乙胺存在的条件下,0.48 mmol芴-9-羧酸可以发生新颖的脱羧反应。考察了水、有机溶剂以及不同物质的量的DPPA和三乙胺对反应收率的影响。... 详细信息

以0.096 mmol叠氮磷酸二苯酯(Diphenylphosphorazidate,DPPA)为催化剂,在极性溶剂和0.48 mmol的三乙胺存在的条件下,0.48 mmol芴-9-羧酸可以发生新颖的脱羧反应。考察了水、有机溶剂以及不同物质的量的DPPA和三乙胺对反应收率的影响。并针对反应结果,提出了可能的反应机理,即:反应中芴-9-羧酸形成的碳负离子可以被结构中的五元环稳定,亲核进攻DPPA形成六元环状过渡态,并发生分子内消除反应,得到脱羧产物。

关键词：芴-9-羧酸脱羧反应 DPPA