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Finite-temperature ductility-brittleness and electronic structures of Al_(n)Sc(n=1,2 and 3)

Rare Metals 2024年第8期43卷 3974-3989页

作者： Xue-Qian Wang Ying Zhao Hao-xuan Liu Shu-Chen Sun Hong-Bo Yang Jia-Min Zhong Gan-Feng Tu Song Li Yu-Dong Zhang Claude Esling Hai-Le Yan Liang Zuo Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education) School of Material Science and EngineeringNortheastern UniversityShenyang 110819China School of Metallurgy Northeastern UniversityShenyang 110819China Rare Earth Functional Materials(Xiong'an)Innovation Center Co. Ltd.Xiong'an 071700China Laboratoire d'étude des Microstructures et de Mécanique des Matériaux(LEM3) Unikersitéde Lorraine57045MetzFrance

Finite-temperature ductility-brittleness and electronic structures of Al_(3)Sc,Al_(2)Sc and AlSc are studied comparatively by first-principles calculations and ab initio molecular *** show that Al_(3)Sc and Al_(2)Sc are brittle at both ground state and finite temperatures,while AlSc possesses a significantly superior *** ground state,AlSc is ductile from Pugh's and Poisson's criteria,while it is brittle in Pettifor's *** ductility of all Al_(3)Sc,Al_(2)Sc and AISc improves greatly with the elevated ***,the Cauchy pressure of AlSc undergoes a transition from negative to *** T>600 K,AlSc is unequivocally classified as ductile from all criteria *** all compounds,the Al-Al bond originated from s-p and p-p orbital hybridizations,and the Al-Sc bond dominated by p-d covalent hybridization,are the first and second strongest chemical bonds,*** explain the difference in mechanical properties,the mean bond strength(MBS)is introduced in this *** weaker Al-Al bond in AlSc,leading to a smaller MBS,could be the origin of the softer elastic stiffness and superior intrinsic *** longer length of the Al-Al bond in AlSc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional *** longer length of the Al-Al bond in AISc is responsible for its weaker bond ***,the enhanced metallicity of the Al-Al bond in AlSc would also contribute to its exceptional ductility.

关键词： Al-Sc Target materials Intrinsic ductility Finite-temperature elastic constant First-principles calculation

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Modeling of material deformation behavior in micro-forming under consideration of individual grain heterogeneity

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Transactions of Nonferrous Metals Society of China 2020年第11期30卷 2994-3005页

作者： Zhen-wu MA xuan PENG Chun-ju WANG Zi-yang CAO College of Mechanical Engineering Suzhou University of Science and TechnologySuzhou 215009China Robotics and Microsystems Center School of Mechanical and Electrical EngineeringSoochow UniversitySuzhou 215131China

This study aims to develop a model to characterize the inhomogeneous material deformation behavior in ***,the influence of individual grain heterogeneity on the deformation behavior of CuZn20 foils was investigated via tensile and micro-hardness *** results showed that different from thick sheets,the hardening behavior of grains in the deformation area of thin foils is not *** flow stress of thin foils actually only reflects the average hardening behavior of several easy-deformation-grains,which is the reason that thinner foils own smaller flow ***,a composite modeling method under consideration of individual grain heterogeneity was developed,where the effects of grain orientation and shape are quantitatively represented by the method of flow stress classification and Voronoi tessellation,*** model provides an accurate and effective method to analyze the influence of individual grain heterogeneity on the deformation behavior of the micro-sized material.

关键词： micro-forming size effects inhomogeneous material behavior grain heterogeneity composite modeling

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Exosomes derived from stem cells as an emerging therapeutic strategy for intervertebral disc degeneration

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World Journal of Stem Cells 2020年第8期12卷 803-813页

作者： Zhi-Lei Hu Hai-Yin Li Xian Chang Yue-Yang Li Chen-Hao Liu Xiao-Xin Gao Yu Zhai Yu-xuan Chen Chang-Qing Li Department of Orthopedics Xinqiao HospitalArmy Military Medical UniversityChongqing 400037China Center of Traumatic Orthopedics People's Liberation Army 990 HospitalXinyang 46400Henan ProvinceChina

Intervertebral disc(IVD)degenerative diseases are a common problem in the world,and they cause substantial social and economic burdens for *** current methods for treating IVD degenerative diseases mainly include surgery and conservative treatment,which cannot fundamentally restore the normal structure of the *** continuous research on the mechanism of degeneration and the development of regenerative medicine,rapid progress has been made in the field of regenerative medicine regarding the use of stem cell-derived exosomes,which are active biological substances used in intercellular communication,because they show a strong effect in promoting tissue *** study of exosomes in the field of IVD degeneration has just begun,and many surprising achievements have been *** paper mainly reviews the biological characteristics of exosomes and highlights the current status of exosomes in the field of IVD degeneration,as well as future developments regarding exosomes.

关键词： Exosomes Intervertebral disc degeneration Stem cells MicroRNA Regenerative medicine Biological characteristic

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复发肺结核患者再感染病原学研究带给我们的启示

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中华结核和呼吸杂志 2006年第2期29卷 73-74页

作者：潘毓萱北京市结核病胸部肿瘤研究所微生物与免疫学室 101149

本期发表的梅建等[1] 和沈国妙等[2]二文,会令我们对肺结核复发患者再感染的病原学产生新的认识.

关键词：肺结核复发病原学研究肺结核患者再感染耐药结核病结核分枝杆菌原发性耐药分型技术外源性基因型

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Single Ti atoms coupled with Ti-O clusters enable low temperature hydrogen cycling by sodium alanate

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Rare Metals 2024年第6期43卷 2671-2681页

作者： Zhuang-He Ren Xin Zhang Wen-xuan Zhang Zhen-Guo Huang Li-Mei Yang Ya-Xiong Yang Zheng-Long Li Juan Li Wen-Ping Sun Ming-Xia Gao Hong-Ge Pan Yong-Feng Liu State Key Laboratory of Silicon and Advanced Semiconductor Materials Zhejiang UniversityHangzhou 310027China School of Materials Science and Engineering Zhejiang UniversityHangzhou 310058China School of Civil&Environmental Engineering.University of Technology Sydney Sydney2007 NSWAustralia Institute of Science and Technology for New Energy Xi'an Technological UniversityXi'an 710021China College of Materials Science and Engineering Zhejiang University of TechnologyHangzhou 310014China

Ti-based catalysts are known to improve the hydrogen storage performance of NaAlH4by facilitating the dissociation/recombination of H-H and Al-H *** catalytic activity of metallic Ti species strongly depends on its particle size and *** clusters and even single atoms are therefore highly desirable,but their controllable fabrication has been highly *** rein,we demonstrate a novel facile sonochemical synthesis of a Ti-O clusters featuring single Ti atom catalyst at room *** reducing TiCl_(4)by MgBu_(2)with ultrasound instead of heating as driving force,numerous single Ti atoms coupled with Ti-O clusters with Ti loading on graphene(Ti_(1)/Ti-O@G)up to 22.6 wt%have been successfully *** prepared Ti_(1)/Ti-O@G contributes high reactivity and superior catalytic activity,therefore enabling full dehydrogenation of NaAlH_(4)at 80℃in thermogravimetric mode and re-hydrogenation at 30℃and 10 MPa with 4.9 wt% H_(2).This fact indicates for the first time that single Ti atom catalyst with high loading is highly effective in catalyzing hydrogen cycling of NaAlH4at remarkably reduced temperatures.

关键词： Hydrogen storage Nanocatalysis Transition metals Single Ti atoms NaAlH_(4)

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中国现代美学的话语空间与方法论转型

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北京理工大学学报（社会科学版） 2013年第6期15卷 135-144页

作者：裴萱武汉大学文学院武汉430072

中国现代美学呈现出中西美学"交互转换"的情景:西方美学经历本体论、主体论之后,最终打破了主客二分的哲学认识论话语模式和无限膨胀的主体自身,而是以意象派、现象学为代表,采用非理性、意象直观等思维方式试图返回经验事实;而中国现... 详细信息

中国现代美学呈现出中西美学"交互转换"的情景:西方美学经历本体论、主体论之后,最终打破了主客二分的哲学认识论话语模式和无限膨胀的主体自身,而是以意象派、现象学为代表,采用非理性、意象直观等思维方式试图返回经验事实;而中国现代以来则是引介西方资源重塑美学学科,从学科框架、话语方式到哲学背景都是参考西方美学理论资源,以现代性启蒙的姿态和审美独立的话语诉求建设学院化的美学知识形态。这两者"交互转换"的话语空间使我们认识到:美学自诞生之日起就决定了与审美实践天然的联系,并且试图以感性的力量探寻人的本质存在问题。同时,也能看到现在美学在发展过程中所失落的古典话语资源,并且也使中国现代美学和西方现代美学站到了同一起跑线上,这恰恰是中国现代美学价值重塑和发展的机遇。感性直观和审美文化构成了未来中西美学发展的双向维度,"体验———反思"的方法论转型也适应了未来美学的发展需要。

关键词：交互转换话语空间美学现象直观审美文化方法论

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漢代“唯”字印輯考

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书法研究 2024年第1期 78-90,195,196页

作者：張軒韓國加圖立大學

漢印中有衆多含有“唯”字的印章,其具體含義史籍無載,諸家學者考證亦看法不一。論文通過對漢代“唯”字印進行爬梳整理,搜羅衆家之説,參以己見,以究其義,將漢代“唯”字印分爲表唯一、謙下意;吉語、厭勝印;地名、職官印三類。根據“唯... 详细信息

漢印中有衆多含有“唯”字的印章,其具體含義史籍無載,諸家學者考證亦看法不一。論文通過對漢代“唯”字印進行爬梳整理,搜羅衆家之説,參以己見,以究其義,將漢代“唯”字印分爲表唯一、謙下意;吉語、厭勝印;地名、職官印三類。根據“唯”字與不同印文内容的綴合,梳理“唯印”不同的功能和意義,可以更清晰地感受“唯印”的藝術屬性和獨特價值,也可以更全面地認識漢印的發展脉絡。

关键词：漢印唯印唯諾地名

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Overexpression of HMGB1 A-box reduced lipopolysaccharide-induced intestinal inflammation via HMGB1/TLR4 signaling in vitro

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World Journal of Gastroenterology 2015年第25期21卷 7764-7776页

作者： Fu-Cai Wang Jing-xuan Pei Jun Zhu Nan-Jin Zhou Dong-Sheng Liu Hui-Fang Xiong Xiao-Qun Liu Dong-Jia Lin Yong Xie Department of Gastroenterology the First Affiliated Hospital of Nanchang University Gastro-enterology Institute of Jiangxi Province Key Laboratory of Digestive Diseases of Jiangxi Province Department of Immunology Medical College of Nanchang University Department of Pathophysiology Medical College of Nanchang University Institute of Immunology and Biological Therapy Jiangxi Academy of Medical Sciences

AIM: To investigate the inhibitory effects and mechanism of high mobility group box(HMGB)1 A-box in lipopolysaccharide(LPS)-induced intestinal ***: Overexpression of HMGB1 A-box in human intestinal epithelial cell lines(SW480 cells) was achieved using the plasmid p EGFP-N1. HMGB1 A-box-overexpressing SW480 cells were stimulated with LPS and co-culturing with human monocyte-like cell lines(THP-1 cells) using a Transwell system, compared with another HMGB1 inhibitor ethyl pyruvate(EP). The m RNA and protein levels of HMGB1/toll-like receptor(TLR) 4 signaling pathways [including HMGB1, TLR4, myeloid differentiation factor88(MYD88), Phosphorylated Nuclear Factor κB(p NF-κB) p65] in the stimulated cells were determined by realtime polymerase chain reaction and Western blotting. The levels of the proinflammatory mediators [including HMGB1, interleukin(IL)-1β, IL-6 and tumor necrosis factor(TNF)-α] in the supernatants of the stimulated cells were determined by ***: EP downregulated the m RNA and protein levels of HMGB1, inhibited the TLR4 signaling pathways(TLR4, MYD88 and p NF-κB p65) and reduced the secretion of proinflammatory mediators(HMGB1, IL-1β, IL-6 and TNF-α) in the SW480 and THP-1 cells activated by LPS but not in the unstimulated cells. Activated by LPS, the overexpression of HMGB1 A-box in the SW480 cells also inhibited the HMGB1/TLR4 signaling pathways and reduced the secretion of these proinflammatory mediators in the THP-1 cells but not in the transfected and unstimulated cells. CONCLUSION: HMGB1 A-box, not only EP, can reduce LPS-induced intestinal inflammation through inhibition of the HMGB1/TLR4 signaling pathways.

关键词： High mobility group box 1 Toll-like receptor 4 HMGB1 A-box Ethyl pyruvate Inflammatory bowel disease

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Serotonin receptor 2B induces visceral hyperalgesia in rat model and patients with diarrhea-predominant irritable bowel syndrome

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World Journal of Gastroenterology 2024年第10期30卷 1431-1449页

作者： Zheng-Yang Li Yu-Qing Mao Qian Hua Yong-Hong Sun Hai-Yan Wang xuan-Guang Ye Jing-Xian Hu Ya-Jie Wang Miao Jiang Department of Gastroenterology Jinshan Hospital of Fudan UniversityShanghai 201508China Department of Gastroenterology Shanghai General HospitalShanghai Jiao Tong University School of MedicineShanghai 200080China Department of Gastroenterology Dalian Friendship HospitalDalian 116001Liaoning ProvinceChina Department of Pathology Jinshan Hospital of Fudan UniversityShanghai 201508China

BACKGROUND Serotonin receptor 2B(5-HT2B receptor)plays a critical role in many chronic pain *** possible involvement of the 5-HT2B receptor in the altered gut sensation of irritable bowel syndrome with diarrhea(IBS-D)was investigated in the present *** To investigate the possible involvement of 5-HT2B receptor in the altered gut sensation in rat model and patients with *** Rectosigmoid biopsies were collected from 18 patients with IBS-D and 10 patients with irritable bowel syndrome with constipation who fulfilled the Rome IV criteria and 15 healthy *** expression level of the 5-HT2B receptor in colon tissue was measured using an enzyme-linked immunosorbent assay and correlated with abdominal pain *** IBS-D rat model was induced by intracolonic instillation of acetic acid and wrap *** in visceral sensitivity and 5-HT2B receptor and transient receptor potential vanilloid type 1(TRPV1)expression were examined following 5-HT2B receptor antagonist *** in visceral sensitivity after administration of the TRPV1 antago-INTRODUCTION Irritable bowel syndrome(IBS)is a chronic functional bowel disorder characterized by recurrent abdominal pain with altered bowel habits that affects approximately 15%of the population worldwide[1].IBS significantly impacts the quality of life of *** the pathogenesis of IBS is not completely understood,the role of abnormal visceral sensitivity in IBS has recently emerged[2,3].5-Hydroxytryptamine(5-HT)is known to play a key role in the physiological states of the gastrointestinal *** 5-HT levels in IBS with diarrhea(IBS-D)patients were greater than those in healthy controls[4],suggesting a possible role of 5-HT in the pathogenesis of *** serotonin receptor 2(5-HT2 receptor)family comprises three subtypes:5-HT2A,5-HT2B,and *** 5-HT2 receptors exhibit 46%-50%overall sequence identity,and all of these receptors preferentially bind to Gq/

关键词： Diarrhea-predominant irritable bowel syndrome Serotonin receptor 2B Transient receptor potential vanilloid type-1 Visceral hypersensitivity Abdominal pain

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高层框架-斜交网格结构协同受力性能研究

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工程力学 2020年第2期37卷 44-49页

作者：史庆轩张锋西安建筑科技大学西部绿色建筑国家重点实验室陕西西安710055 西安建筑科技大学土木工程学院陕西西安710055 陕西省建筑设计研究院(集团)有限公司陕西西安710018

高层框架-斜交网格结构是由高层斜交网格结构和框架结构组成的双抗侧力体系。采用理论推导和数值模拟的方法研究了该体系处于弹性和弹塑性状态下楼层水平剪力分配规律。针对高层斜交网格结构和框架结构协同工作变形特点,提出结构体系的... 详细信息

高层框架-斜交网格结构是由高层斜交网格结构和框架结构组成的双抗侧力体系。采用理论推导和数值模拟的方法研究了该体系处于弹性和弹塑性状态下楼层水平剪力分配规律。针对高层斜交网格结构和框架结构协同工作变形特点,提出结构体系的弹性平面简化分析模型,进一步推导出结构侧向变形和剪力计算公式,并研究了结构处于弹性阶段时的剪力分配规律;采用非线性静力推覆法对结构体系在弹塑性阶段的变形特性、刚度退化和剪力分配规律进行了研究。结果表明:高层斜交网格结构和框架结构的协同工作性能良好,结构在弹性阶段,结构刚度的特征值及荷载分布对其剪力分配影响较大;结构进入塑性阶段,斜柱刚度退化速率较快,楼层剪力存在重分配现象。

关键词：斜交网格结构双抗侧力体系刚度退化弹性阶段塑性阶段水平剪力分布

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