检索结果-南通市图书馆

Nanoscale deformation of multiaxially forged ultrafine-grained Mg-2Zn-2Gd alloy with high strength-high ductility combination and comparison with the coarse-grained counterpart

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Materials Science & Technology 2018年第2期34卷 311-316页

作者： K. li V.S.Y.Injeti P. Trivedi l.e. Murr R.D.K. Misra Department of Metallurgical Materials and Biomedical Engineering University of Texas at El Paso 500 W. University Avenue El Paso TX 79968-0521 USA

Cold processing of magnesium （Mg） alloys is a chal.e.ge because Mg has a hexagonal close-packed （HCP） lattice with limited slip systems, which makes it difficult to plastically deform at low temperature. To address this chal.e.ge, a combination of annealing of as-cast alloy and multi-axial forging was adopted ro obtain isotropic ultrafine-grained （UFG） structure in a lean Mg-2Zn-2Gd alloy with high strength （yield strength： ~227 MPa）-high ductility （% elongation：～30%） combination. This combination of strength and ductility is excel.e.t for the lean alloy, enabling an understanding of deformation processes in a formable high strength Mg-rare earth alloy. The nanoscale deformation behavior was studied via nanoindentation and electron microscopy, and the behavior was compared with its low strength （yield strength：～46 MPa） - low ductility （% elongation：～7%） coarse-grained （CG） counterpart. In the UFG alloy, extensive dislocation slip was an active deformation mechanism, while in the CG alloy, mechanical twinning occurred. The differences in the deformation mechanisms of UFG and CG alloys were reflected in the discrete burst in the load-displacement plots. The deformation of Mg-2Zn-2Gd alloys was significantly infl.e.ced by the grain structure, such that there was change in the deformation mechanism from dislocation slip （non-basal slip） to nanoscale twins in the CG structure. The high plasticity ofUFG Mg alloy invol.e. high dislocation activity and change in activation volume.

关键词： Magnesium alloy Ultrafine-grained Nanoscale deformation

维普期刊数据库

Recent Advances of Multi-Channel Transmission in Metro Access Networks

在线全文

学校读者我要写书评

暂无评论

光学学报 2003年第S1期23卷 731-732页

作者： H.J. Thiele l.e. Nelson B. eichenbaum S.K. Das OFS 791 Holmdel-Keyport Road Holmdel NJ 07733OFS 791 Holmdel-Keyport Road Holmdel NJ 07733OFS 19 Schoolhouse Road Somerset NJ 08873OFS 19 Schoolhouse Road Somerset NJ 08873

We discuss the concept of coarse wavelength-division multiplexing (CWDM) for metro networks. After reviewing the requirements on components such as lasers and fiber, we propose different architectures for a flexible u... 详细信息

关键词： CWDM on as of Recent Advances of Multi-Channel Transmission in Metro Access Networks DWDM in

维普期刊数据库

Separation, Purification and Identification 1

在线全文

学校读者我要写书评

暂无评论

丛书名： The molecular world

2002年

作者： l.e. Smart (editor)

来源：畅想之星图书光盘版（南... 评论

在线全文

畅想之星图书光盘版（南通市图书馆镜像）

学校读者我要写书评

暂无评论

高分子和复合材料的力学性能

高分子和复合材料的力学性能

Merging bound states in the continuum in an open acoustic resonator

作者： l.e.尼尔森(l.e. Niel.e.)

来源：南通市图书馆图书评论

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 124-131页

作者： lujun Huang Bin Jia Artem S.Pilipchuk Sibo Huang Chen Shen Almas F.Sadreev Yong li Andrey e.Miroshnichenko School of Physics and electronic Sciences East China Normal University Institute of Acoustics Tongji University l.V.Kirensky Institute of Physics Department of Mechanical.e.gineering Rowan University School of engineering and Technology University of New South Wales at Canberra

Bound states in the continuum （BICs） are perfectly localized resonances despite embedding in the continuum ***,an isolated BIC is very sensitive to the structure ***,we report merging acoustic BICs in a single open resonator,robust against the structure *** find that both symmetry-protected BIC and Friedrich-Wintgen BIC are sustained in a single coupled waveguide-resonator *** varying the height and length of the resonator,these two BICs move toward each other and merge into a single one at a critical *** to an individual BIC,the merged BIC is robust against fabrication error because its Q-factor is proportional to Δl-4,whereΔl.e.bodies the structure *** essence of this extraordinary phenomenon is perfectly explained by the two-and three-level approximations of the effective nonHermitian ***,we present direct experimental demonstrations of the moving and merging of BICs in a coupled 3D waveguide-resonator,which are evidenced by the vanishing of the linewidth of Fano resonance in the transmission *** results may find exciting applications in designing high-quality acoustic sources,sensors and fil.e.s.

关键词： acoustic resonances bound state in the continuum high-Q resonances

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

创造性地降低成本第1版

创造性地降低成本

丛书名：书名原文: Creative cost improvement for managers

1987年

作者：（美）l.e.泰格里弗瑞

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

高聚物的力学性能第1版

塔米尼奥：“海德格尔和胡塞尔的《逻辑研究》——海德格尔最后一次讨论课纪念”

1966年

作者：（美）l.e.尼尔生冯之榴等译

高聚物的力学性能

关键词：高聚物力学性质

来源：汇雅图书（南通市图书馆... 评论

在线全文

汇雅图书（南通市图书馆）

学校读者我要写书评

暂无评论

哲学动态 2006年第1期 74-75页

作者： Moran,D embree,l.e. 陈志远

《存在与时间》所表达的对胡塞尔的感激和称赞不能掩盖那里表达的分歧和批评。海格尔在现象学研究和先天方法上都表示了对胡塞尔的感谢，但也指出了胡塞尔忽略了存在问题。尤其在此在问题上，他认为，通达此在的有效路径是对我的心理行... 详细信息

《存在与时间》所表达的对胡塞尔的感激和称赞不能掩盖那里表达的分歧和批评。海格尔在现象学研究和先天方法上都表示了对胡塞尔的感谢，但也指出了胡塞尔忽略了存在问题。尤其在此在问题上，他认为，通达此在的有效路径是对我的心理行为的纯粹知觉和形的反思，这样给予的东西是自明的，是对日常领会的此在概念的视而不见。胡塞尔将存在看为我思之物，并未与笛卡尔的“我思故我在”传统分离开来，客体被看做认识主体之“内”的东西，主客体都成了现成物，胡塞尔严格要求的有效存在的主体遮蔽了存在问题。

关键词：胡塞尔《逻辑研究》海德格尔 “我思故我在” 讨论课《存在与时间》纪念心理行为认识主体

The Third Dimension 1

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