检索结果-南通市图书馆

MICROSTRUCTURE AND mechanical BEHAVIOR OF Nb-(10, 15)A1-20V ALLOYS

Acta Metallurgica Sinica(English Letters) 2004年第4期17卷 575-583页

作者： H.S.Jiao F.Barradas T.S.Rong I.P.Jones M.Aindow department of Metallurgy and Materials University of Birmingham B15 2TT UKDepartment of Metallurgy and Materials University of Birmingham B15 2TT UKDepartment of Metallurgy and Materials University of Birmingham B15 2TT UKDepartment of Metallurgy and Materials University of Birmingham B15 2TT UKDepartment of Metallurgy and Materials Engineering Institute of Materials Science University of Connecticut CT 06269-3136 USA

Compression tests at room and high temperature and creep tests at high temperature have been performed on B2 Nb15A120V and Nb10Al20V alloys. At room temperature, in the as-cast state, both alloys exhibited significant ductility in compression. The Burgers vectors of the dislocations were found to be 1/2lipping on {112}. The dislocations showed good mobility. Dislocation clusters also triggered the formation of pseudotwins, which resulted in serrated yielding. In steady state creep, deformation occurred by a combination of dislocation glide and climb, giving a homogeneous mi-crostructure. The dislocations in NblOAl20V were determined to be 1/2(111) slipping on {110} with some egments. After creep at 1100℃, Nb 15A120V showed a two phase structure with a few dislocations in the A15 phase but no dislocations in the A2 phase.

关键词： dislocation pseudotwin NbAlV alloy creep

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

Geometrical Dependence of Shear Viscosity of Polymer Melts Flowing in Micro Channel

Geometrical Dependence of Shear Viscosity of Polymer Melts F...

引用

第十二届全国流变学学术会议

作者： Xiang Lin Zhimin Dang Dongyun Ren Adrian Kelly mike Woodhead Phil Coates department of Polymer Science & engineering School of Chemistry and Biological EngineeringUniversity of Science & Technology Beijing College of mechanical and Electrical engineering Beijing University of Chemical Technology IRC in Polymer engineering School of EngineeringDesign & TechnologyUniversity of Bradford

Geometrical dependence of viscosity of polymer melts(for example,PMMA and HDPE)are studied with different capillary dies of 0.25,0.5 and 1.0mm,and by means of a twin-bore capillary rheometer based on

关键词： Viscosity and viscoelasticity Rheology Properties and characterization

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Analysis of the in vitro degradation and the in vivo tissue response to bi-layered 3D-printed scaffolds combining PLA and biphasic PLA/bioglass components--Guidance of the inflammatory response as basis for osteochondral regeneration

引用

Bioactive Materials 2017年第4期2卷 208-223页

作者： mike Barbeck Tiziano Serra Patrick Booms Sanja Stojanovic Stevo Najman Elisabeth Engel Robert Sader Charles James Kirkpatrick Melba Navarro Shahram Ghanaati Private Office BerlinGermany Institute for Bioengineering of Catalonia(IBEC) Biomaterials for Regenerative MedicineBarcelonaSpain Clinic of Oro-Maxillofacial and Plastic Surgery FORM-LabGoethe University FrankfurtFrankfurtGermany University of Ni's Faculty of MedicineDepartment for Cell and Tissue EngineeringInstitute of Biology and Human GeneticsNi'sSerbia Technical University of Catalonia(UPC) Dpt.Materials Science and MetallurgySpain CIBER en Bioingenieria Biomateriales y Nanomedicina(CIBER-BBN)Spain

The aim of the present study was the in vitro and in vivo analysis of a bi-layered 3D-printed scaffold combining a PLA layer and a biphasic PLA/bioglass G5 layer for regeneration of osteochondral defects in vivo Focus of the in vitro analysis was on the(molecular)weight loss and the morphological and mechanical variations after immersion in SBF.The in vivo study focused on analysis of the tissue reactions and differences in the implant bed vascularization using an established subcutaneous implantation model in CD-1 mice and established histological and histomorphometrical methods.Both scaffold parts kept their structural integrity,while changes in morphology were observed,especially for the PLA/G5 scaffold.mechanical properties decreased with progressive degradation,while the PLA/G5 scaffolds presented higher compressive modulus than PLA scaffolds.The tissue reaction to PLA included low numbers of BMGCs and minimal vascularization of its implant beds,while the addition of G5 lead to higher numbers of BMGCs and a higher implant bed vascularization.Analysis revealed that the use of a bi-layered scaffold shows the ability to observe distinct in vivo response despite the physical proximity of PLA and PLA/G5 layers.Altogether,the results showed that the addition of G5 enables to reduce scaffold weight loss and to increase mechanical strength.Furthermore,the addition of G5 lead to a higher vascularization of the implant bed required as basis for bone tissue regeneration mediated by higher numbers of BMGCs,while within the PLA parts a significantly lower vascularization was found optimally for chondral regeneration.Thus,this data show that the analyzed bi-layered scaffold may serve as an ideal basis for the regeneration of osteochondral tissue defects.Additionally,the results show that it might be able to reduce the number of experimental animals required as it may be possible to analyze the tissue response to more than one implant in one experimental animal.

关键词： Bioactive glass Polylactic acid(PLA) Bi-layer scaffold Multinucleated giant cells Bone substitute Vascularization Calcium phosphate glass

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

Assessing the Impact of Aggregate Type on Air Lime Mortar Properties Using Scanning Electron Microscopy

引用

Journal of Civil engineering and Architecture 2016年第2期10卷 139-147页

作者： Sarah Scannell mike Lawrence and Pete walker Building Research Establishment Centre for Innovative Construction Materials Department of Architecture and Civil EngineeringUniversity of Bath Bath BA2 7AY UK

In recent years, the need for low energy materials has become increasingly important. With government targets aiming to reduce carbon emissions by 80% by 2050, and the construction industry being responsible for 50% of the UK"s carbon emissions, it is of vital importance that positive changes are made. One of these changes is to reduce the carbon footprint of the materials used in construction. Lime mortar has been used for centuries, but since the arrival of cement, its use in modern construction has diminished, in part due to having lower compressive strengths than cement mortar. Air lime mortar, in particular, can be categorised as low energy due to the reabsorption of a significant amount of CO2 during the setting process: carbonation. The current study focuses on the impact of different types of aggregate (limestone and silicate) on air lime mortar strength. Previous research has found that higher strengths can be achieved with the use of limestone aggregate, but little is known about the reasons why. The research presented here looks at a microstructural analysis through use of SEM (scanning electron microscopy) in order to determine reasons behind the strength differences. At early stages of curing, there are clear differences at the interface of binder and aggregate.

关键词：扫描电子显微镜砂浆性能石灰石骨料空气类型抗压强度比评价

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

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

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

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：