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Densification behavior of mechanically milled Cu–8 at% Cr alloy and its mechanical and electrical properties

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Progress in Natural Science:Materials International 2014年第6期24卷 608-622页

作者： S.Patra Gouthama k.Mondaln Department of Materials Science and Engineering Indian Institute of Technology

Synthesis and consolidation behavior of Cu–8 at%Cr alloy powders made by mechanical alloying with elemental Cu and Cr powders,and subsequently,compressive and electrical properties of the consolidated alloys were *** solubility of Cr in Cu during milling,and subsequent phase transformations during sintering and heat treatment of sintered components were analyzed using X-ray diffraction,scanning electron microscopy and transmission electron *** milled powders were compacted applying three different pressures(200 MPa,400 MPa and 600 MPa)and sintered in H2atmosphere at 900 1C for 30 min and at 1000 1C for 1 h and 2 *** maximum densification(92.8%)was achieved for the sample compacted at 600 MPa and sintered for 1000 1C for 2 *** and densification behavior further increased for the compacts sintered at 900 1C for 30 min after rolling and annealing *** investigation of the sintered compacts revealed the bimodal distribution of Cu grains with nano-sized Cr and Cr2O3precipitation along the grain boundary as well as in grain *** of grain boundaries by the precipitates stabilized the fine grain structure in bimodal distribution.

关键词： Electron microscopy X-ray diffraction Mechanical alloying Cu-based alloys Nanostructured materials

Adhesive bonding of composite aircraft structures:Challenges and recent developments

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Science China(Physics,Mechanics & Astronomy) 2014年第1期57卷 2-11页

作者： PANTELAkIS Sp. TSErPES k.I. Laboratory of Technology & Strength of Materials Department of Mechanical Engineering & Aeronautics University of Patras Patras 26500 Greece

In this review paper,the challenges and some recent developments of adhesive bonding technology in composite aircraft structures are *** durability of bonded joints is defined and presented for parameters that may influence bonding *** is also,a numerical design approach for composite joining profiles used to realize adhesive *** is shown that environmental ageing and pre-bond contamination of bonding surfaces may degrade significantly fracture toughness of bonded ***,it is obvious that additional research is needed in order to design joining profiles that will enable load transfer through shearing of the *** findings,together with the limited capabilities of existing non-destructive testing techniques,can partially explain the confined use of adhesive bonding in primary composite aircraft structural parts.

关键词： adhesive bonding fracture toughness finite element analysis

Generalized Multiobjective Symmetric Duality under Second-Order(F, α, ρ, d)-Convexity

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Acta Mathematicae Applicatae Sinica 2015年第2期31卷 529-542页

作者： S.k.Gupta D.Dangar Department of Mathematics Indian Institute of Technology Roorkee Department of Mathematics and Humanities IT Nirma University

In this paper, we first formulate a second-order multiobjective symmetric primal-dual pair over arbitrary cones by introducing two different functions f ： r^n × r^m → rk and g ： r^n × r^m → r^l in each k-objectives as well as l-constraints. Further, appropriate duality relations are established under second-order（F, α, ρ, d）-convexity assumptions. A nontrivial example which is second-order（F, α, ρ, d）-convex but not secondorder convex/F-convex is also illustrated. Moreover, a second-order minimax mixed integer dual programs is formulated and a duality theorem is established using second-order（F, α, ρ, d）-convexity assumptions. A self duality theorem is also obtained by assuming the functions involved to be skew-symmetric.

关键词： multiobjective symmetric duality second-order(F α ρ d)-convex duality theorems minimax self duality

Electrochemical Impedance Analysis of Biofunctionalized Conducting Polymer-Modified Graphene-CNTs Nanocomposite for Protein Detection

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Nano-Micro Letters 2017年第1期9卷 104-112页

作者： Shobhita Singal Avanish k.Srivastava rajesh CSIr-National Physical Laboratory Dr.K.S.Krishnan RoadNew Delhi 110012India Academy of Scientific and Innovative research(AcSIr) CSIR-National Physical LaboratoryDr.K.S.Krishnan RoadNew Delhi 110012India

We report an electrodeposited poly(pyrrole-co-pyrrolepropylic acid) copolymer modified electroactive graphene-carbon nanotubes composite deposited on a glassy carbon electrode to detect the protein antigen(cTnI). The copolymer provides pendant carboxyl groups for the site-specific covalent immobilization of protein antibody, antitroponin I. The hybrid nanocomposite was used as a transducer for biointerfacial impedance sensing for cTnI *** results show that the hybrid exhibits a pseudo capacitive behaviour with a maximum phase angle of 49° near 1 Hz,which is due to the inhomogeneous and porous structure of the hybrid composition. The constant phase element of copolymer is 0.61(n = 0.61), whereas, it is 0.88(n = 0.88) for the hybrid composites, indicating a comparatively homogeneous microstructure after biomolecular functionalization. The transducer shows a linear change in charge transfer characteristic(r_(et)) on cTnI immunoreaction for spiked human serum in the concentration range of 1.0 pg mL^(-1)–10.0 ng mL^(-1). The sensitivity of the transducer is 167.8 ± 14.2 Ω cm^2 per decade, and it also exhibits high specificity and good reproducibility.

关键词： Conducting polymer Graphene Carbon nanotube Hybrid Transducer Protein antigen cTnI Electrochemical impedance

Analysis of Field Data on Computer Failures

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Journal of Computer Science & Technology 1990年第2期5卷 99-108页

作者： ravishank.r.k.Iyer Mei-Chen Hsueh Computer Systems Group Coordinated Science Laboratory University of Illinois at Urbana-Champaign 1101 West Springfield Avenue Urbana Illinois 61801U.S.A.

This paper emphasizes the importance of making field measurements for effective and realistic dependability *** examples are given,both based on real data from IBM *** first evaluates the impact of the operating environment on system failure characteristics and the second shows how an accurate model depicting this interaction can be extracted from real data.

关键词： Analysis of Field Data on Computer Failures

光系统Ⅱ反应中心复合物不均一性分析及其对策

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四川大学学报（自然科学版） 1999年第6期36卷 1120-1124页

作者：倪世明谭英才陈疏影杜林方四川大学生物系成都610064

应用FPLC ,SDS PAGE、吸收光谱和荧光光谱等技术 ,揭示了利用交换柱层析制备的光系统II反应中心D1 D2 Cytb559复合物的不均一性 ,主要表现为色素组分不同 ,色素组分丢分 ,去垢剂的变性作用及样品内部降解现象 .作者分析了该反应中心不... 详细信息

应用FPLC ,SDS PAGE、吸收光谱和荧光光谱等技术 ,揭示了利用交换柱层析制备的光系统II反应中心D1 D2 Cytb559复合物的不均一性 ,主要表现为色素组分不同 ,色素组分丢分 ,去垢剂的变性作用及样品内部降解现象 .作者分析了该反应中心不均一性的原因 ,并提出更换去垢剂 ,缩短制备时间。

关键词：光系统Ⅱ 不均匀一性复合物 PSⅡ反应中心

High-cycle Fatigue Life Extension of Glass Fiber/Polymer Composites with Carbon Nanotubes

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Journal of Wuhan University of Technology(Materials Science) 2009年第2期24卷 167-173页

作者： Christopher S Grimmer C k H Dharan Berkeley Composites Laboratory University of California 5135 Etcheverry Hall Berkeley CA94720-1740 USA

The present work shows that the addition of small volume fractions of multi-walled carbon nanotubes （CNTs） to the matrix results in a significant increase in the high-cycle fatigue life. It is proposed that carbon nanotubes tend to inhibit the formation of large cracks by nucleating nano-scale damage zones. In addition, the contribution to energy absorption from the fracture of nanotubes bridging across nano-scale cracks and from nanotube pull-out from the matrix are mechanisms that can improve the fatigue life. An energy-based model was proposed to estimate the additional strain energy absorbed in fatigue. The distributed nanotubes in the matrix appear to both distribute damage as well as inhibit damage propagation resulting in an overall improvement in the fatigue strength of glass fiber composites.

关键词： glass fiber composites carbon nanotubes fatigue strain energy

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初中生积极心理品质发展现状调查

中国特殊教育 2017年第9期 89-96页

作者：高永金张瑜傅纳桂林市教育科学研究所桂林541001 广西医科大学大学生心理健康教育咨询中心南宁530021 北京师范大学教育学部教育心理与学校咨询研究所北京100875

为了解初中生积极心理品质发展现状及最需要发展和培养的积极心理品质,本研究采用初中生积极心理品质量表,对桂林市1362名学生进行调查。结果发现,桂林市初中生积极心理品质发展水平总体良好,六个维度得分由高到底依次为:仁爱、正义、... 详细信息

为了解初中生积极心理品质发展现状及最需要发展和培养的积极心理品质,本研究采用初中生积极心理品质量表,对桂林市1362名学生进行调查。结果发现,桂林市初中生积极心理品质发展水平总体良好,六个维度得分由高到底依次为:仁爱、正义、卓越、节制、勇气和智慧;初中女生的积极心理品质发展水平显著高于男生;初一学生的积极心理品质发展水平显著高于初二、初三学生;城市初中生在积极心理品质发展水平上优于农村初中生;独生子女初中生的积极心理品质发展水平显著高于非独生子女;学习成绩优秀的初中生在积极心理品质发展水平上好于学习成绩暂时落后的学生;民主型和专制型家庭教养方式的初中生在积极心理品质发展水平上显著高于放任型家庭教养方式的初中生;父母文化程度越高,孩子的积极心理品质发展水平越好;父母职业对初中生积极心理品质的发展有较大影响。本研究对初中生积极心理品质培养有借鉴意义。

关键词：初中生积极心理品质调查研究

remediation of Malathion Contaminated Soil Using Zero Valent Iron Nano-Particles

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american Journal of Analytical Chemistry 2012年第1期3卷 76-82页

作者： r. k. Singhal B. Gangadhar H. Basu V. Manisha G.r. k. Naidu A.V. r. reddy 不详

In this study, iron nano-particles were used to remediate malathion contaminated soil in the concentration range of 1 - 10 μg?g–1. The zero valent iron nano-particles were prepared by reducing ferric chloride solution with sodium boro- hydride for remediation of the soil. The optimized quantity of iron nano particles was found to be 0.1 g?kg–1 of soil con- taminated with 10 μg?g–1 of malathion. Malathion was determined in the soil after leaching to water at pH 8.2 and fol- lowed by its oxidation with slight excess of N-bromosuccinimide (NBS). The unconsumed NBS was estimated by measuring the decrease in the color intensity of rhodamine B. Degradation product formed during the oxidation of ma-lathion by zero valent iron was monitored by the Attenuated Total reflectance Fourier Transform Infrared Spectros- copy (ATr-FTIr). The results clearly showed that quantitative oxidation of malathion was achieved within eight min- utes after the addition of zero valent iron nano particles.

关键词： Malathion Zero Valent Iron Nano Particle Soil Contamination