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In situ observation of the pseudoelasticity of twin boundary

Journal of Materials Science & Technology 2023年第35期166卷 200-207页

作者： Jingpeng Hou Keliang Qiu fengshi li Zhenyu Yang Yonghai Yue Yongjun Tian Zhongchang Wang lin Guo School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China Institute of Solid Mechanics School of Aeronautics Sciences and EngineeringBeihang UniversityBeijing 100191China Center for High Pressure Science State Key Laboratory of Metastable Materials Science and TechnologyYanshan UniversityQinhuangdao 066004China International Iberian Nanotechnology Laboratory(INL) Braga 4715-330Portugal

Twin boundary(TB)is a special and fundamental internal interface that plays a key role in altering the mechanical and physical properties of ***,the atomistic deformation mechanism of TB re-mains under debate,of which the most concerned aspect is how TB would affect the mechanical strength and plasticity of a ***,we introduce our new discovery that the pseudoelastic strain of a TB can recover with decomposition and escape of pile-up dislocations,demonstrated by imposing a sponta-neous pseudoelastic deformation with recoverable plastic bending strain up to 5.1%on a *** found that the steps on the curved TB gradually annihilated during the migration of the TB,which was in-duced by the slip of decomposition dislocations on the *** TB not only provides local strain harden-ing through interaction with dislocations during the loading stage but also acts as a channel for the fast movement of decomposition dislocations during the recovery ***,the TB can maintain excellent pseudoelasticity under a multicycle bending test,which may play an important role in improving the fa-tigue resistance of *** findings could open up a new avenue for optimizing the mechanical properties of materials by manipulating their twin boundaries at the nanoscale.

关键词： Twin boundary Pseudoelasticity Migration Dislocation-twin boundary interaction

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Wet Chemical Synthesis of Amorphous Nanomaterials with Well-Defined Morphologies

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Accounts of Materials Research 2021年第9期2卷 804-815页

作者： Hewei Zhao fengshi li Shaoxiong Wang lin Guo School of Chemistry Beijing Advanced Innovation Center for Biomedical EngineeringBeihang UniversityBeijing 100191China

CONSPECTUS:Amorphous nanomaterials,with unique structural features such as long-range atomic disorder and nanoscale particle or grain sizes,possess some advantageous properties for a number of materials *** example,amorphous vanadium oxide exhibits a record-high cycling stability for *** synthetic strategies have been developed to produce amorphous nanomaterials,such as physical processing-based approaches including cutting,deposition,and spinning,as well as chemical syntheses by solution or solid state ***,despite the rapid development of amorphous nanomaterials,their morphology is still irregular or primarily *** limited morphology control is partially attributed to the lack of preferred growth direction for the amorphous *** will be interesting to know whether different morphologies of even amorphous nanomaterials can influence their properties as much as their crystalline *** chemical synthesis,which can usually be carried out under relatively facile reaction conditions,has achieved remarkable success for creating crystalline nanomaterials with well-defined shapes,such as one-dimensional(1D)nanowires,two-dimensional(2D)nanosheets,and three-dimensional(3D)complex ***,there are two main obstacles for shape control of amorphous nanomaterials using wet chemical ***,it is difficult to form a stable amorphous state under wet chemical *** amorphous state is metastable in solution according to classic nucleation theory,which is prone to phase transformation to form crystalline ***,common morphology control mechanisms for nanocrystals are ultimately relying on the intrinsic directionality of the lattices,which unfortunately is not relevant to the isotropic amorphous *** this Account,we describe how shape control of 1D,2D,and 3D amorphous nanomaterials can be achieved in wet chemical synthesis to create well-defined morphologies,whi

关键词： cycling amorphous crystalline

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Achieving Seconds-to-Hours Duration-Tunable Organic Long Persistent Luminescence from Carbon Dots-Based Exciplex Systems by Energy Gaps Regulation

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Chinese Journal of Chemistry 2024年第12期42卷 1407-1417页

作者： Yixuan Xu Kai Jiang linger Feng Xinyuan Tong Zuxu Zhou fengshi li Yi Zhang Jiaren Du Hengwei lin International Joint Research Center for Photo-responsive Molecules and Materials School of Chemical and Material EngineeringJiangnan UniversityWuxiJiangsu214122China State Key Laboratory of Food Science and Resources Jiangnan UniversityWuxiJiangsu 214122China

Comprehensive Summary Duration-tunable afterglow materials have garnered considerable attention in various ***,carbon dots(CDs)-based long persistent luminescence(LPL)composites with a tunable duration in an ultrawide range of seconds-to-hours levels were designed and prepared for the first *** contrast to the established CD-based afterglow materials,we reported that CD-based composites exhibit LPL in the form of exciplexes and long-lived charge-separated states,enabling the LPL to be prolonged from several seconds to over one hour,exceeding the typical regulation range(limited to 1 min).Further studies revealed that the relationship between the excited and charge-transfer states of CDs plays a pivotal role in activating the LPL and regulating its ***,these composites exhibited high photoluminescence(PL)quantum yields of up to 60.63%,and their LPL was robust under ambient conditions,even in aqueous *** robust and superior LPL performance endows these composites with a strong competitive advantage in dynamic display systems,such as tags for time-resolved data encryption and displays of the remaining time of *** study offers an approach to preparing CDs-based LPL composites with tunable durations and may provide new insights for the development of rare-earth-free LPL materials.

关键词： Carbon dots Composites Charge separation Exciplex Persistent luminescence

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Diabetes mellitus and adverse outcomes after carotid endarterectomy:A systematic review and meta-analysis

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Chinese Medical Journal 2023年第12期136卷 1401-1409页

作者： fengshi li Rui Zhang Xiao Di Shuai Niu Zhihua Rong Changwei liu Leng Ni Department of Vascular Surgery Peking Union Medical College HospitalChinese Academy of Medical Sciences and Peking Union Medical CollegeBeijing 100730China Department of Breast Oncoplastic Surgery Hunan Cancer Hospital&The Affiliated Cancer Hospital of Xiangya School of MedicineCentral South UniversityChangshaHunan 410031China

Background:There is still uncertainty regarding whether diabetes mellitus(DM)can adversely affect patients undergoing carotid endarterectomy(CEA)for carotid *** aim of the study was to assess the adverse impact of DM on patients with carotid stenosis treated by ***:Eligible studies published between 1 January 2000 and 30 March 2023 were selected from the PubMed,EMBASE,Web of Science,CENTRAL,and ClinicalTrials *** short-term and long-term outcomes of major adverse events(MAEs),death,stroke,the composite outcomes of death/stroke,and myocardial infarction(MI)were collected to calculate the pooled effect sizes(ESs),95%confidence intervals(CIs),and prevalence of adverse *** analysis by asymptomatic/symptomatic carotid stenosis and insulin/noninsulin-dependent DM was ***:A total of 19 studies(n=122,003)were *** the short-term outcomes,DM was associated with increased risks of MAEs(ES=1.52,95%CI:[1.15-2.01],prevalence=5.1%),death/stroke(ES=1.61,95%CI:[1.13-2.28],prevalence=2.3%),stroke(ES=1.55,95%CI:[1.16-1.55],prevalence=3.5%),death(ES=1.70,95%CI:[1.25-2.31],prevalence=1.2%),and MI(ES=1.52,95%CI:[1.15-2.01],prevalence=1.4%).DM was associated with increased risks of long-term MAEs(ES=1.24,95%CI:[1.04-1.49],prevalence=12.2%).In the subgroup analysis,DM was associated with an increased risk of short-term MAEs,death/stroke,stroke,and MI in asymptomatic patients undergoing CEA and with only short-term MAEs in the symptomatic *** insulin-and noninsulin-dependent DM patients had an increased risk of short-term and long-term MAEs,and insulin-dependent DM was also associated with the short-term risk of death/stroke,death,and ***:In patients with carotid stenosis treated by CEA,DM is associated with short-term and long-term *** may have a greater impact on adverse outcomes in asymptomatic patients after ***-dependent DM may have a more significant impact on post-CEA adverse outcom

关键词： Carotid artery stenosis Carotid endarterectomy Diabetes mellitus Meta-analysis

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信息法学研究模式对比分析

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图书馆学研究 2006年第5期 11-13,16页

作者：李凤石中共黑龙江省委党校文献信息中心

信息法学是一门发展中的跨学科,其研究模式还处在探索的阶段。本文通过对已有成果的研究,分析了业已出现的基于传统法学的研究模式、基于信息管理学的研究模式、基于部门分支法的研究模式、基于实证分析的研究模式,对各种模式的优势和... 详细信息

信息法学是一门发展中的跨学科,其研究模式还处在探索的阶段。本文通过对已有成果的研究,分析了业已出现的基于传统法学的研究模式、基于信息管理学的研究模式、基于部门分支法的研究模式、基于实证分析的研究模式,对各种模式的优势和不足进行了系统分析。

关键词：信息法学研究模式对比分析

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论Word在多媒体教学中的运用

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软件导刊 2010年第4期9卷 68-69页

作者：李丰世琼州学院计算机科学与技术系海南三亚572022

随着计算机技术的迅猛发展,字处理软件Word在多媒体教学的使用范围上逐渐加大了,由此,将谈一谈Word在多媒体教学中对多余字符或符号等问题处理上的一些运用。

关键词： Word 多媒体教学运用

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谈降低图书印制成本的途径

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辽宁经济职业技术学院学报.辽宁经济管理干部学院 2002年第2期 23-46页

作者：李丰实辽宁教育出版社辽宁沈阳110003

降低图书印制成本一要加强印制管理,其中包括加强预算管理,加速资金周转和杜绝质量事故发生。二要现代出版技术,调整结构,降低图书的直接成本。

关键词：降低印制成本途径

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静脉支架受压的影响因素及评估方法

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中华实验外科杂志 2019年第10期36卷 1902-1905页

作者：李逢时刘晓兵上海交通大学医学院附属第九人民医院血管外科 200011

随着血管腔内介入技术的发展,球囊扩张、支架植入已成为慢性静脉阻塞性疾病的主要治疗方法.但是,不同的病变性质和不同支架的使用,其预后结果均有不同.其中,支架受压是影响其预后的主要因素.本文将对不同病变下支架受压形成原因及影响... 详细信息

随着血管腔内介入技术的发展,球囊扩张、支架植入已成为慢性静脉阻塞性疾病的主要治疗方法.但是,不同的病变性质和不同支架的使用,其预后结果均有不同.其中,支架受压是影响其预后的主要因素.本文将对不同病变下支架受压形成原因及影响因素和支架受压的评估方法进行综述,探讨不同病变因素对支架的影响,并对支架受压的测定方法提出展望.

关键词：支架受压血栓形成后综合征髂静脉受压综合征评估

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经胸超声心动图下的心脏外膜脂肪厚度与老年冠心病的相关性分析

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甘肃医药 2020年第6期39卷 530-531页

作者：李逢时巩义市人民医院河南巩义451200

目的:分析经胸超声心动图下的心脏外膜脂肪厚度与老年冠心病的相关性。方法:选取2017年1月至2018年3月我院接受诊治的96例老年冠心病患者,均对其进行经胸超声心动图检测,依据其心脏外膜脂肪厚度将其分为A、B、C、D四组,对四组冠脉造影... 详细信息

目的:分析经胸超声心动图下的心脏外膜脂肪厚度与老年冠心病的相关性。方法:选取2017年1月至2018年3月我院接受诊治的96例老年冠心病患者,均对其进行经胸超声心动图检测,依据其心脏外膜脂肪厚度将其分为A、B、C、D四组,对四组冠脉造影积分及冠脉狭窄程度进行分析,探讨心脏外膜脂肪厚度与老年冠心病的相关性。结果:四组患者的冠状造影积分D组>C组>B组>A组,组间差异具有统计学意义(P<0.05)。pearson相关性分析结果表明:老年冠心病发生率与心脏外膜脂肪厚度呈正相关性(P<0.05)。结论:老年冠心病患者病情可随着心脏外膜脂肪厚度的增加而加重,心脏外膜脂肪与老年冠心病密切相关,为老年冠心病发生和病情发展的主要因素。

关键词：经胸超声心动图心脏外膜脂肪厚度老年冠心病

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超声心动图对甲状腺功能亢进性心脏病患者右心室功能变化的评估价值

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甘肃医药 2020年第1期39卷 58-59页

作者：李逢时巩义市人民医院河南巩义451200

目的:探究超声心动图对甲状腺功能亢进性心脏病(甲亢心)患者右心室功能变化的评估价值。方法:选取2015年3月至2017年3月来我院就诊的甲亢心患者80例,各40例。合并心力衰竭者作为甲亢心心衰组,无心力衰竭者作为甲亢心无心衰组,另选40例... 详细信息

目的:探究超声心动图对甲状腺功能亢进性心脏病(甲亢心)患者右心室功能变化的评估价值。方法:选取2015年3月至2017年3月来我院就诊的甲亢心患者80例,各40例。合并心力衰竭者作为甲亢心心衰组,无心力衰竭者作为甲亢心无心衰组,另选40例甲亢患者为甲亢组,各组均行超声心动图诊断,采集并记录数据。结果:甲亢心心衰组甲状腺FT3显著高于甲亢心无心衰组(P<0.05);甲亢心心衰组及甲亢心无心衰组LVDd、RVDd、PAP均高于甲亢组,SV、CO、LVEF均低于甲亢组(P<0.05)。甲亢心心衰组与甲亢心无心衰组对比,甲亢心心衰组RVDd、PAP较高,而SV、CO、LVEF指标较低,P<0.05。结论:采用超声心动图能够较好地判断甲亢心患者病情变化,可作为临床判断患者病情的有效手段。

关键词：甲状腺功能亢进心脏病右心室功能超声心动图

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