检索结果-南通市图书馆

Formation and crystallization behavior of Fe-based amorphous precursors with pre-existingα-Fe nanoparticles-Structure and magnetic properties of high-Cu-content Fe-Si-B-Cu-Nb nanocrystalline alloys

引用

Journal of Materials Science & Technology 2021年第6期65卷 171-181页

作者： yanhui Li Xingjie Jia wei Zhang Yan Zhang Guoqiang Xie Zhiyong Qiu Junhua Luan Zengbao Jiao Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute for Materials Research Tohoku UniversitySendai 980-8577Japan School of Materials Science and Engineering Harbin Institute of Technology(Shenzhen)Shenzhen 518055China Center for Advanced Structural Materials Department of Materials Science and EngineeringCity University of Hong KongHong KongChina Department of Mechanical Engineering The Hong Kong Polytechnic UniversityHong KongChina

Structure,crystallization behavior,and magnetic properties of as-quenched and annealed Fe_(81.3)Si_(4)O_(13)Cu_(1.7)(Cu1.7)alloy ribbons and effects of Nb alloying have been ***-dimensional atom probe and transmission electron microscopy analyses reveal that high-number-density Cu-clusters and Pre-existing Nano-sized a-Fe Particles(PN-a-Fe)are coexistence in the melt-spun Cu1.7 amorphous matrix,and the PN-α-Fe form by manners of one-direction adjoining and enveloping the ***-step crystallization behavior associated with growth of the PN-a-Fe and subsequent nucleation and growth of newly-formedα-Fe is found in the primary crystallization stage of the Cu1.7 *** number densities of the Cu-clusters and PN-a-Fe in melt-spun Fe8_(1.3-x)Si_(4)B_(13)Cu_(1.7)Nb_(x)alloys are gradually reduced with enriching of Nb,and a fully amorphous structure forms at 4 at.%Nb,although smaller Cu-clusters still *** annealing,2 at.%Nb coarsens the average size(D_(α-F)e)of theα-Fe grains from 14.0 nm of the Nb-free alloy to 21.6 nm,and 4 at.%Nb refines the D_(α-Fe)to 8.9 *** mechanisms of theα-Fe nucleation and growth during quenching and annealing for the alloys with large quantities of PN-α-Fe as well as after Nb alloying have been discussed,and an annealing-induced oc-Fe growth mechanism in term of the barrier co-contributed by competitive growth among the PN-a-Fe and diffusion-suppression effect of Nb atoms has been proposed.A coercivity(HC)αDα-Fe^(3)correlation has been found for the nanocrystalline alloys,and the permeability is inverse with the H_(C).

关键词： Fe-based nanocrystalline alloy Cu-cluster Pre-existingα-Fe nanoparticle Crystallization behavior Soft magnetic property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Structure and properties of nanoporous FePt fabricated by dealloying a melt-spun Fe(60)Pt(20)B(20)alloy and subsequent annealing

引用

Journal of Materials Science & Technology 2020年第1期36卷 128-133页

作者： Dianguo Ma Yingmin Wang yanhui Li Rie Y·Umetsu Shuli Ou Kunio Yubuta wei Zhang Key Laboratory of Materials Modification by Laser Ionand Electron Beams(Ministry of Education)School of Materials Science and EngineeringDalian University of TechnologyDalian 116024China Institute for Materials ResearchTohoku UniversitySendai 980-8577Japan

A nanoporous FePt alloy has been fabricated by dealloying a melt-spun Fe(60)Pt(20)B(20)alloy composed of nanoscale amorphous and face-centered-cubic FePt(fcc-FePt)phases in H2 SO4 aqueous *** nanoporous alloy consists of single fcc-FePt phase with an Fe/Pt atomic ratio of about 55.3/44.7,and possesses a uniform interpenetrating ligament-channel structure with average ligament and pore sizes of 27 nm and 12 nm,*** nanoporous fcc-FePt alloy shows soft magnetic characteristics with a saturation magnetization of 37.9 emu/g and better electrocatalytic activity for methanol oxidation than commercial Pt/C in acidic *** phase transformation from disordered fcc-Fe Pt into ordered face-centered-tetragonal FePt(L10-FePt)in the nanoporous alloy has been realized after annealing at823-943 K for 600 *** volume fraction of the L10-FePt phase in the alloy increases with the rise of annealing temperature,which results in the enhancements of coercivity and saturation magnetization from 0.14 kOe and 38.5 emu/g to 8.42 kOe and 51.4 emu/g,*** ligament size of the samples is increased after annealing.

关键词： Nanoporous metals Fe-Pt-B alloy Dealloying L10-FePt Magnetic property

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Low-velocity Impact Property of Alumina/Epoxy/Metal Laminated Composites

引用

Journal of Wuhan University of Technology(Materials Science) 2016年第4期31卷 779-785页

作者：白明敏 LI weixin LI yanhui ZHAO wei WU jianqing RAO Pinggen School of Materials Science and Engineering South China University of Technology Guangzhou 510640 China Department of Human Sciences Jingdezhen University Jingdezhen 333000 China

With Al foil,Cu foil and steel mesh as the metal interlayers,respectively,three types of alumina/epoxy/metal laminated composites were fabricated with epoxy resin adhesive as a binder via a simple *** impact tests were performed and the fracture patterns and impact response of all the three laminates were *** experimental results indicate that the absorbed energy is mainly determined by metal *** peak load depends on not only alumina substrate but also metal *** Al2O3/epoxy/Cu laminates sustain the maximum peak load and Al2O3/epoxy/steel mesh laminates have the largest threshold energy for *** fracture analysis shows that the main damage modes are Al2O3 matrix cracking and metal deformation for lower impact energies,and complete breakage and penetration for higher impact energies.

关键词： epoxy laminated penetration interlayer adhesive absorbed alumina Alumina sustain toughness

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

More tree growth reduction due to consecutive drought and its legacy effect for a semiarid larch plantation in Northwest China

引用

Journal of Forestry Research 2024年第2期35卷 188-196页

作者： Yanfang Wan Pengtao Yu yanhui Wang Jiamei Li Yushi Bai Yipeng Yu Bingbing Liu Xiaocha wei Key Laboratory of Forest Ecology and Environment of National Forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijing 100091People’s Republic of China

Extreme climate has increasingly led to negative impacts on forest ecosystems globally,especially in semiarid areas where forest ecosystems are more ***,it is poorly understood how tree growth is affected by different drought *** 2006–2009,the larch plantations in the semiarid areas of Northwest China were negatively affected by four consecutive dry years,which was a very rare phenomenon that may occur frequently under future climate *** this study,we analyzed the effect of these consecutive dry years on tree growth based on the data of the tree rings in the dominant layer of the forest canopy on a larch *** found that the tree-ring width index(RWI)in dry years was lower than that in normal years,and it experienced a rapidly decreasing trend from 2006 to 2009(slope=-0.139 year^(-1),r=-0.94)due to water supply deficits in those dry *** induced legacy effects of tree growth reduction,and consecutive dry years corresponded with greater growth reductions and legacy *** reductions and legacy effects were significantly stronger in the third and fourth consecutive dry years than that of single dry year(p<0.05),which might have been due to the cumulative stress caused by consecutive dry *** results showed that larch trees experienced greater tree growth reduction due to consecutive dry years and their legacy effect,and the trees had lower recovery rates after consecutive dry *** results highlight that consecutive dry years pose a new threat to plantations under climate warming,and thus,the effect of climate extremes on tree growth should be considered in growth models in semiarid areas.

关键词： Tree rings Drought effects Legacy effects Growth-climate relationships Larix principis-rupprechtii

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

钢筋混凝土桁架拱桥承载力加固的力学性能对比分析

引用

贵州大学学报（自然科学版） 2021年第5期38卷 74-80页

作者：王勤征张华刚陈红鸟马克俭魏艳辉刘宇贵州大学空间结构研究中心贵州贵阳550025 贵州省结构工程重点实验室贵州贵阳550025 贵州省交通规划勘察设计研究院股份有限公司贵州贵阳550001

由于设计标准的原因,早期的钢筋混凝土桁架拱桥不满足现代交通需求时,需做承载力加固处理。采用粘贴钢板、全部截面箱型转换和关键截面箱型转换等3种加固方法,通过Midas/Civil和有限元分析(finite element analysis,FEA)软件建立某桁架... 详细信息

由于设计标准的原因,早期的钢筋混凝土桁架拱桥不满足现代交通需求时,需做承载力加固处理。采用粘贴钢板、全部截面箱型转换和关键截面箱型转换等3种加固方法,通过Midas/Civil和有限元分析(finite element analysis,FEA)软件建立某桁架拱桥加固前后的计算模型,对比分析其在静力、动力和稳定性等方面的加固效果。结果表明:全部截面箱型转换加固在改善结构受力,降低结构下挠变形,提高刚度及稳定性方面优势明显;粘贴钢板加固在提高面外刚度和稳定性方面表现不足;关键截面箱型转换加固由于其结构本身缺陷,加固效果不理想。

关键词：桁架拱桥承载力加固有限元力学性能截面箱型转换

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Argonaute protein as a linker to command center of physiological processes

引用

Chinese Journal of Cancer Research 2013年第4期25卷 430-441页

作者： Kaifa wei Lingjuan Wu yanhui Chen Yina Lin Yanmei Wang Xiaoyao Liu Daoxin Xie Department of Biological Sciences and Biotechnology Minnan Normal University School of Life Sciences Tsinghua University

MicroRNAs （miRNAs） post-transcriptionally regulate gene expression by binding to target mRNAs with perfect or imperfect complementarity, recruiting an Argonaute （AGO） protein complex that usually results in degradation or translational repression of the target mRNA. AGO proteins function as the Slicer enzyme in miRNA and small interfering RNA （siRNA） pathways involved in human physiological and pathophysiological processes, such as antiviral responses and disease formation. Although the past decade has witnessed rapid advancement in studies of AGO protein functions, to further elucidate the molecular mechanism of AGO proteins in cellular function and biochemical process is really a challenging area for researchers. In order to understand the molecular causes underlying the pathological processes, we mainly focus on five fundamental problems of AGO proteins, including evolution, functional domain, subcellular location, post-translational modification and protein-protein interactions. Our discussion highlight their roles in early diagnosis, disease prevention, drug target identification, drug response, etc.

关键词： Small RNA Argonaute (AGO) protein functional domain subcellular location post-translational modification pathological process

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mantle melting beneath the Southwest Indian Ridge: signals from clinopyroxene in abyssal peridotites

引用

Acta Oceanologica Sinica 2013年第12期32卷 50-59页

作者： WANG wei CHU Fengyou ZHU Jihao DONG yanhui YU Xing CHEN Ling LI Zhenggang The Second Institute of Oceanography State Oceanic Administration

The mineral chemistry and texture of clinopyroxenes in peridotite from the Kingkong tectonic zone of the Southwest Indian Ridge segment in an effort to constrain mantle melting beneath this slow-spreading ridge are reported. There are three types of clinopyroxenes in the abyssal peridotites： coarse-grained, intergranu- lar and exsolved. The compositional variations among these three types suggest that the coarse-grained clinopyroxene is a mantle-derived source. The A1, Na and Ti contents and the Na/Ti ratio of the coarse- grained clinopyroxene may be used to monitor the degree of partial melting, combined with the contradis- tinction with Spinel Cr#, which is calculated to be between 7.9% and 14.9%, and may represent low degrees of melting in the global ocean ridge system. The along-axis compositional variations in the coarse-grained clinopyroxene suggest that the degree of partial melting is primarily controlled by the transform faults on both sides of the ridge. Nonetheless, the northwestern side of the ridge may be affected by a hypothesised detachment fault as documented by the calculated P-T conditions. Simultaneously high Na and low Ti con- tents in the coarse-grained clinoovroxene points to mantle heterogeneities along the ridge axis.

关键词： partial melting abyssal peridotite clinopyroxene major elements SWIR

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Hybrid Neural Network for Automatic Recovery of Elliptical Chinese Quantity Noun Phrases

引用

Computers, Materials & Continua 2021年第12期69卷 4113-4127页

作者： Hanyu Shi weiguang Qu Tingxin wei Junsheng Zhou Yunfei Long yanhui Gu Bin Li School of Computer Science and Technology Nanjing Normal UniversityNanjing210023China School of Chinese Language and Literature Nanjing Normal UniversityNanjing210097China International College for Chinese Studies Nanjing Normal UniversityNanjing210097China School of Computer Science and Electronic Engineering University of EssexColchesterUK

In Mandarin Chinese,when the noun head appears in the context,a quantity noun phrase can be reduced to a quantity phrase with the noun head *** phrase structure is called elliptical quantity noun *** automatic recovery of elliptical quantity noun phrase is crucial in syntactic parsing,semantic representation and other downstream *** this paper,we propose a hybrid neural network model to identify the semantic category for elliptical quantity noun phrases and realize the recovery of omitted semantics by supplementing concept ***,we use BERT to generate character-level ***,Bi-LSTM is applied to capture the context information of each character and compress the input into the context memory *** CNN is utilized to capture the local semantics of n-grams with various *** on the Chinese Abstract Meaning Representation(CAMR)corpus and Xinhua News Agency corpus,we construct a hand-labeled elliptical quantity noun phrase dataset and carry out the semantic recovery of elliptical quantity noun phrase on this *** experimental results show that our hybrid neural network model can effectively improve the performance of the semantic complement for the elliptical quantity noun phrases.

关键词： Elliptical quantity noun phrase semantic complement neural network

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

我国的人才国际化培养现状及问题分析

引用

科教导刊 2020年第5期 7-8页

作者：魏延辉于立君李光春周雪梅韩云涛哈尔滨工程大学自动化学院黑龙江哈尔滨150001

本科教育是强国基础,而国际化人才培养则为我国实现跨越式发展提供持续动力,也是我国"一带一路"倡议的重要保证。本文首先论述我国进行国际化人才培养的背景及意义,阐述进行国际化人才培养的必要性;其次通过分析发达国家的国际化人才培... 详细信息

本科教育是强国基础,而国际化人才培养则为我国实现跨越式发展提供持续动力,也是我国"一带一路"倡议的重要保证。本文首先论述我国进行国际化人才培养的背景及意义,阐述进行国际化人才培养的必要性;其次通过分析发达国家的国际化人才培养的方式和我国目前国际化人才培养的现状,总结出我国目前国际化人才培养的问题,为进行有针对性的改进提供目标。

关键词：国际化人才培养研究现状问题分析

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

伊布替尼致重度肝损害1例附文献分析

引用

中国医药导刊 2023年第1期25卷 110-113页

作者：朱鸿斌卫延辉林晓燕何玉卓郭学军刘正彪濮阳市油田总医院血液科河南濮阳457001 新乡医学院河南新乡453003

目的:探讨伊布替尼导致肝损害的临床特征并分析伊布替尼导致肝损害的特点及可能机制,以期为临床合理用药提供参考。方法:基于我院1例患者应用伊布替尼治疗滤泡细胞淋巴瘤过程中出现严重胆汁淤积性肝损害的案例,综合分析患者服用伊布替... 详细信息

目的:探讨伊布替尼导致肝损害的临床特征并分析伊布替尼导致肝损害的特点及可能机制,以期为临床合理用药提供参考。方法:基于我院1例患者应用伊布替尼治疗滤泡细胞淋巴瘤过程中出现严重胆汁淤积性肝损害的案例,综合分析患者服用伊布替尼后出现肝损害后相关指标变化,并结合国内外伊布替尼引起肝损害的案例报道分析,探讨伊布替尼导致肝损害的特点及可能机制。结果:本例患者服用伊布替尼72 d后出现胆红素、胆汁酸和转氨酶上升,彩超提示弥漫性肝损害。结论:伊布替尼服用后虽然很少出现因药物不良反应停药现象,但可能在肝脏中蓄积,进而导致肝损害的发生。建议临床上使用伊布替尼时,检测肝功能尤为必要,特别是对于基线时肝功能就出现异常的患者。

关键词：伊布替尼药物性肝损害胆汁淤积

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：