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Microstructural stability of 9-12%Cr ferrite/martensite heat-resistant steels

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Frontiers of Materials Science 2013年第1期7卷 1-27页

作者： Wei YAN Wei WANG yi-yin shan Ke YANG Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China

The microstructural evolutions of advanced 9–12%Cr ferrite/martensite heat-resistant steels used for power generation plants are reviewed in this article. Despite of the small differences in chemical compositions, the steels share the same microstructure of the as-tempered martensite. It is the thermal stability of the initial microstructure that matters the creep behavior of these heat-resistant steels. The microstructural evolutions involved in 9–12%Cr ferrite heat-resistant steels are elaborated, including (1) martensitic lath widening, (2) disappearance of prior austenite grain boundary, (3) emergence of subgrains, (4) coarsening of precipitates, and (5) formation of new precipitates, such as Laves-phase and Z-phase. The former three microstructural evolutions could be retarded by properly disposing the latter two. Namely improving the stability of precipitates and optimizing their size distribution can effectively exert the beneficial influence of precipitates on microstructures. In this sense, the microstructural stability of the tempered martensite is in fact the stability of precipitates during the creep. Many attempts have been carried out to improve the microstructural stability of 9–12%Cr steels and several promising heat-resistant steels have been developed.

关键词： heat-resistant steel microstructure martensite precipitate microstructural evolution

STABILITY ANALYSIS OF HOPFIELD NEURAL NETWORKS WITH TIME DELAY

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Applied Mathematics and Mechanics(English Edition) 2002年第1期23卷 65-70页

作者： WANG Lin-shan(王林山) XU Dao-yi(徐道义) Mathematics College Sichuan University Chengdu 610064 P R China Mathematics College Sichuan University Chengdu 610064 P R China

The global asymptotic stability for Hopfield neural networks with time delay was investigated, A theorem and two corollaries were obtained, in which the boundedness and differentiability of f(j) on R in some articles were deleted. Some sufficient conditions for the existence of global asymptotic stable equilibrium of the networks in this paper are better than the sufficient conditions in quoted articles.

关键词： neural networks equilibrium stability topological degree

An Infrared Photometric Study of Galaxies with Extragalactic H_2O Maser Sources

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Chinese Journal of Astronomy and Astrophysics 2007年第5期7卷 657-668页

作者： Pei-Sheng Chen yi-Fei Gao Hong-Guang shan National Astronomical Observatories / Yunnan Observatory Chinese Academy of Sciences Kunming 650011

All galaxies with extragalactic H2O maser sources observed so far are collected. With the 2MASS and the IRAS photometric data an infrared study is performed on those galaxies. By a comparison between the H2O maser detected sources and non-detected sources in the infrared it is indicated that infrared properties in the IRAS 12-25 #m and 60-100#m are important for producing H20 masers in galaxies. It is also found that the H20 maser galaxies with different nuclear activity types have rather different infrared properties mainly in the IRAS 12-60 μm region.

关键词： galaxies maser -- galaxies nuclei -- galaxies starburst -- infrared galaxies

Bilinear forms through the binary Bell polynomials, N solitons and Backlund transformations of the Boussinesq–Burgers system for the shallow water waves in a lake or near an ocean beach

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Communications in Theoretical Physics 2020年第9期72卷 8-12页

作者： Xin-yi Gao Yong-Jiang Guo Wen-Rui shan State Key Laboratory of Information Photonics and Optical Communications and School of ScienceBeijing University of Posts and TelecommunicationsBeijing 100876China

Water waves are one of the most common phenomena in nature, the studies of which help energy development, marine/offshore engineering, hydraulic engineering, mechanical engineering, etc. Hereby, symbolic computation is performed on the Boussinesq–Burgers system for shallow water waves in a lake or near an ocean beach. For the water-wave horizontal velocity and height of the water surface above the bottom, two sets of the bilinear forms through the binary Bell polynomials and N-soliton solutions are worked out, while two auto-B?cklund transformations are constructed together with the solitonic solutions, where N is a positive integer. Our bilinear forms, N-soliton solutions and B?cklund transformations are different from those in the existing literature. All of our results are dependent on the waterwave dispersive power.

关键词： lakes and ocean beaches shallow water waves Boussinesq–Burgers system symbolic computation bilinear forms through the binary Bell polynomials Backlund transformations solitonic solutions

Proteomics Study of Benzene Metabolite Hydroquinone Induced Hematotoxicity in K562 Cells

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Biomedical and Environmental Sciences 2024年第4期37卷 341-353页

作者： JIN yi shan yi Zong Chun ZHANG Yu Jing RONG Long YU Chun Hong School of Biological Science and Medical Engineering Beihang UniversityBeijing 100191China School of Engineering Medicine Beihang UniversityBeijing 100191China

Objective Hydroquinone(HQ),one of the phenolic metabolites of benzene,is widely recognized as an important participant in benzene-induced ***,there are few relevant proteomics in HQ-induced hematotoxicity and the mechanism hasn’t been fully understood *** In this study,we treated K562 cells with 40μmol/L HQ for 72 h,examined and validated protein expression changes by Label-free proteomic analysis and Parallel reaction monitoring(PRM),and performed bioinformatics analysis to identify interaction *** One hundred and eighty-seven upregulated differentially expressed proteins(DEPs)and 279 downregulated DEPs were identified in HQ-exposed K562 cells,which were involved in neutrophilmediated immunity,blood microparticle,and other GO terms,as well as the lysosome,metabolic,cell cycle,and cellular senescence-related *** on the 23 DEGs and 5 DEPs in erythroid differentiation-related pathways,we constructed the network of protein interactions and determined 6 DEPs(STAT1,STAT3,CASP3,KIT,STAT5B,and VEGFA)as main hub proteins with the most interactions,among which STATs made a central impact and may be potential biomarkers of HQ-induced *** Our work reinforced the use of proteomics and bioinformatic approaches to advance knowledge on molecular mechanisms of HQ-induced hematotoxicity at the protein level and provide a valuable basis for further clarification.

关键词： Hydroquinone Proteomics Hematotoxicity K562 cells

Biliatresone:progress in biliary atresia study

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World Journal of Pediatrics 2023年第5期19卷 417-424页

作者： Jia‑Jie Zhu yi‑Fan Yang Rui Dong shan Zheng Department of Pediatric Surgery Shanghai Key Laboratory of Birth Defectand Key Laboratory of Neonatal DiseaseMinistry of HealthChildren’s Hospital of Fudan University399 Wan Yuan RoadShanghai 201102China

Background Biliary atresia(BA)is one of the main causes of neonatal end-stage liver *** timely diagnosis and treatment,most children with BA will develop irreversible liver fibrosis within the first two *** current theorized causes of BA include viral infection,immune disorders,and genetic defects,the comprehensive etiology is still largely ***,biliatresone attracted much interest for its ability to induce BA in both zebrafish and mice,so we summarized the latest progress of biliatresone research in BA and tried to answer the question of whether it could provide further clues to the etiology of human *** sources We conducted a PubMed search for any published articles related to the topic using search terms including“biliary atresia”,“biliatresone”,“GSH”,and“HSP90”.Relevant data were extracted from the original text or supplementary materials of the corresponding *** Biliatresone had shown its unique toxicity in multiple species such as zebrafish and mice,and pathogenic factors involved included glutathione(GSH),heat shock protein 90(HSP90)and the related *** combination with epidemiological evidence and recent studies on the intestinal flora in biliary atresia,a new pathogenic hypothesis that the occurrence of biliary atresia is partly due to biliatresone or its structure-like compounds depositing in human body via vegetables or/and the altered intestinal flora structure can be tentatively *** Based on the existing evidence,we emphasized that GSH and HSP90 are involved in the development of BA,and the maternal diet,especially higher vegetable intake of Asian women of childbearing age,accompanied by the altered intestinal flora structure,may contribute to the occurrence of biliary atresia and the higher incidence in the Asia ***,the evidence from large sample epidemiological research is necessary.

关键词： Biliary atresia Biliatresone Glutathione Gut flora

Experimental investigation of engineered geopolymer composite for structural strengthening against blast loads

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Defence Technology（防务技术） 2024年第2期32卷 496-509页

作者： shan Liu Chunyuan Liu yifei Hao yi Zhang Li Chen Zhan Li Key Laboratory of Coast Civil Structure Safety of Ministry of Education Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Prefabricated Buildings and Intelligent Construction Hebei University of TechnologyTianjin 300400China Institute of Defense Engineering AMSPLABeijing 100850China Engineering Research Center of Safety and Protection of Explosion&Impact of Ministry of Education Southeast UniversityNanjing 211189JiangsuChina State Key Laboratory of Disaster Prevention&Mitigation of Explosion&Impact Army Engineering University of the PLANanjing 210007JiangsuChina

The recent increase in blast/bombing incidents all over the world has pushed the development of effective strengthening approaches to enhance the blast resistance of existing civil *** geopolymer composite(EGC)is a promising material featured by eco-friendly,fast-setting and strain-hardening characteristics for emergent strengthening and ***,the fiber optimization for preparing EGC and its protective effect on structural elements under blast scenarios are *** this study,laboratory tests were firstly conducted to evaluate the effects of fiber types on the properties of EGC in terms of workability,dry shrinkage,and mechanical properties in compression,tension and *** experimental results showed that EGC containing PE fiber exhibited suitable workability,acceptable dry shrinkage and superior mechanical properties compared with other types of *** that,a series of field tests were carried out to evaluate the effectiveness of EGC retrofitting layer on the enhancement of blast performance of typical *** tests include autoclaved aerated concrete(AAC)masonry walls subjected to vented gas explosion,reinforced AAC panels subjected to TNT explosion and plain concrete slabs subjected to contact *** was found that EGC could effectively enhance the blast resistance of structural elements in different *** AAC masonry walls and panels,with the existence of EGC,the integrity of specimens could be maintained,and their deflections and damage were significantly *** plain concrete slabs,the EGC overlay could reduce the diameter and depth of the crater and spallation of specimens.

关键词： Engineered geopolymer composites Fiber optimization Strengthening material Blast resistance Masonry wall Reinforced AAC panel Plain concrete slab

Numerical analysis on phase change progress and thermal performance of different roofs integrated with phase change material(PCM)in Moroccan semi-arid and Mediterranean climates

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Building Simulation 2023年第1期16卷 69-85页

作者： Yanqiu Huang shan Yang Moussa Aadmi yi Wang Mustapha Karkri Zhenhao Zhang State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyNo.13 Yanta RD.Xi'an 710055China School of Building Services Science and Engineering Xi'an University of Architecture and TechnologyNo.13 Yanta RD.Xi'an 710055China LMASI ElectromagnetismPhysics of Plasmas and ApplicationsPolydisciplinary Faculty of NadorMohammed First UniversityB.P 30062700SelouaneNadorMorocco CERTES Univ Paris Est Creteil61 Avenue du Général de GaulleF-94010 CreteilFrance

Phase change material(PCM)applied to roofs can weak external heat entering the room to reduce air-conditioning energy *** this study,three forms of macro-encapsulated PCM roofs with different PCMs(RT27,RT31,RT35HC,PT37)are *** effects of PCM thickness,the encapsulation forms,and different PCMs on the thermal performance of the roof are discussed in Moroccan semi-arid and Mediterranean *** results show that as the PCM thickness increases,the peak temperature attenuation of the roof inner surface *** two climates,the pure PCM layer among the three encapsulation forms(*** PCM layer,PCM in aluminum tubes,PCM in triangular aluminum)is the easiest to appear the phenomenon of insufficient heat storage and release,while the reduction of the peak inner surface temperature and time lag is the most *** the PCM in the aluminum tube,phase change time is the shortest and the latent heat utilization ratio is the highest,while thermal regulation performance is the least *** PCM in triangular aluminum can improve the latent heat utilization ratio significantly,and its thermal regulation performance is in the *** semi-arid climate,the time lag increases with phase change temperature *** time lag could reach up to 6 h with 37℃phase transition *** Mediterranean climate,the longest time lag with RT31 is 5 h,while the lowest peak inner surface temperature appears with *** obtained conclusions could provide guidance for the application of PCM roofs in these two climates.

关键词： numerical simulation PCM roof thermal performance inner surface temperature time lag

Mucosa repair mechanisms of Tong-Xie-Yao-Fang mediated by CRH-R2 in murine,dextran sulfate sodium-induced colitis

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World Journal of Gastroenterology 2018年第16期24卷 1766-1778页

作者： shan-shan Gong yi-Hong Fan Shi-yi Wang Qing-Qing Han Bin Lv yi Xu Xi Chen Yao-Er He The First Clinical Medical College of Zhejiang Chinese Medical University Hangzhou 310053Zhejiang ProvinceChina Department of Gastroenterology The First Affiliated Hospital of Zhejiang Chinese Medical UniversityHangzhou 310006Zhejiang ProvinceChina

AIM To explore the significance of corticotropin-releasing hormone(CRH)-receptor(R)2 in mucosal healing of dextran sulfate sodium(DSS)-induced colitis and the effect of Tong-Xie-Yao-Fang(TXYF) on CRH-R2 expression and *** Ulcerative colitis was induced in mice by administration of 3%(w/v) DSS for 7 d. Once the model was established,mice were administered urocortin-2(30 μg/kg), a peptide which binds exclusively to CRH-R2, or various doses of aqueous TXYF extracts(2.8-11.2 g/kg), a CRH-R2 antagonist Astressin(Ast)2B(20 μg/kg), Ast2B + Ucn2, or Ast2B with various doses of aqueous TXYF extracts for 9 d. Colonic mucosal permeability was then evaluated by measuring the fluorescence intensity in serum. The colitis disease activity index(DAI), histology, body weight loss and colon length were assessed to evaluate the condition of colitis. Terminal deoxynucleotidyl transferase d UTP nick-end labeling was used to detect apoptosis of the intestinal epithelial cells. The expression level of Ki-67 represented the proliferation of colonic epithelial cells and was detected by immunohistochemistry. The expression levels of inflammation cytokines IL-6, TNF-α and CXCL-1 were examined in colon tissues using real-time PCR and ELISA *** Compared with the DSS group, mice treated with the CRH-R2 antagonist Ast2B showed greater loss of body weight, shorter colon lengths(4.90 ± 0.32 vs 6.21 ± 0.34 cm, P duced colonic epithelial cell proliferation(4.97 ± 4.25 vs 22.51 ± 8.22, P < 0.05). Increased apoptosis(1422.39 ± 90.71 vs 983.01 ± 98.17, P < 0.001) was also demonstrated. The Ucn2 group demonstrated lower DAI(0.87 ± 0.55 vs 2.42 ± 0.32, P < 0.001) and his

关键词： Tong-Xie-Yao-Fang Aqueous extracts Corticotropin-releasing hormone receptor 2 Urocortin 2 Astressin 2B Mucosal healing Ulcerative colitis