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近终形连铸技术的现状及发展趋势 总被引:3,自引:0,他引:3
近终形连铸技术生产主要包括薄带及薄板坯连铸技术,是一项集冶金、材料、机械、自控等多学科交叉的重大高新技术。综述了薄主萍板坯连铸技术的国外新进展,分析了存在的问题及发展趋势,讨论了我国在该技术发展和应用上的现状及前景,提出若干建议。 相似文献
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为研究非晶薄带的弯曲特性,本文给出了非昌薄带弯曲试验方法,并建立了试验设备。 相似文献
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NiTi合金薄带的电阻变化率—应变关系研究 总被引:2,自引:0,他引:2
研究了NiTi形状记忆合金薄带的电阻变化率随应变的变化关系,发现NiTi合金薄带的电阻变化率对应变敏感,且呈出现良好的规律性,从而证明NiTi合金具有优良的传感特性,可以复合于本体材料内兼作传感元件和作动元件,是具有主动监测与控制裂纹或振动的功能的理想智能结构。 相似文献
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研究了不同温度热处理对Fe79.5P12C6Cu0.5Mo0.5Si1.5的巨磁阻抗的影响,发现GMI不仅与磁导率有关,而且也受到磁各向异性的作用。 相似文献
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快速凝固Al-Cu-Si薄带的脆性研究 总被引:3,自引:0,他引:3
对用单辊法制备的Al-Cu-Si钎料薄带进行XRD、SEM、DSC分析,以及对CuAl2脆性相进行研究后结果表明,CuAl2相的分布及形态、CuAl2相的几种亚稳态结构都会影响钎料薄带的脆性。 相似文献
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详细研究了Fe84Zr7B9薄带中的巨磁阻抗效应。研究了退火工艺对巨磁阻抗效应的影响。发现600℃退火20min的Fe84Zr7B9薄带在1.5MHz下的(Zmax(H)-Z(5200A/m)/Z(5200A/m)达到152%。同时我们还测量磁导率随磁场的变化关系,研究了不同退火工艺下材料的磁导率,发现材料磁导率值与巨磁阻效应的大小紧密相关。 相似文献
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J. Guilleminot S. Comas-Cardona D. Kondo C. Binetruy P. Krawczak 《Composites Science and Technology》2008,68(7-8):1777-1786
A key objective dealing with 3D sandwich structures is to maximize the through-thickness stiffness, the strength of the core and the core to faces adhesion. The Napco® technology was especially designed for improving such material properties and is under investigation in this paper. In particular, the potential of the process is characterized using a micromechanical modelling combined to a parametric probabilistic model. An experimental analysis is further detailed and validates the theoretical estimates of the core-related elastic properties. It is readily shown that the technology is able to produce parts with significantly improved mechanical properties. Finally, thanks to the probabilistic aspect of the modelling, the study allows to establish a link between the randomness of the process and the uncertainties of the final mechanical properties. Thus, the present approach can be used to optimize the technology as well as to properly design structures. 相似文献
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The combination of high magnetic field and ultra-low temperatures has proved to be indispensable for a broad range of condensed matter physics experiments. However problems with the global helium supply have raised significant concern about affordability of conventional cryogenic equipment. The latest developments in cryo-cooler technology offer a new generation of cryogenic systems in which the cryogen consumption can be significantly reduced and in some cases completely eliminated. We have demonstrated a new high magnetic field - ultra-low temperature neutron scattering sample environment system based on re-condensing technology. In our tests we have shown that the 9 T superconducting magnet, built for the ISIS facility, can be run with a dilution refrigerator insert in continuous zero boil-off regime without any additional cooling. 相似文献
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目的 智能玩具在儿童的生活和学习中扮演着重要角色。探讨人机交互技术如何更好地适配儿童的学习需求,使智能玩具发挥其潜力,成为有效的学习工具。方法 通过梳理智能的儿童智能创新学习玩具的典型案例,对案例进行分析,提炼共性和特点,深入探讨智能玩具的交互技术与儿童学习目的、学习方式之间的关系。讨论在不同场景和学习目的下如何与人机交互技术相适配。结论 从学习目标、交互技术和设计理论的角度提出了儿童创新学习玩具的设计建议,为如何设计应用于儿童学习与教育领域的智能创新学习玩具提供了参考。 相似文献
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协作关系中的不确定性与技术链接 总被引:1,自引:0,他引:1
本文运用技术链接这一理论概念,描述了在不同的技术水平(即技术维)和不同的协作程度(即协作维)的交互作用下的四种协作关系类型,即技术专家型,问题解决型,商品供给型以及协作专家型;并根据这四种不同的类型讨论了其相应的不确定性.本文的结论是,只有在问题解决型的协作中,不确定性是较低的. 相似文献
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Yong Lei Qinglin Wu 《Composites Part A》2012,43(1):73-78
Wood plastic composites were prepared based on in situ formed poly(ethylene terephthalate) (PET) sub-micro-fibril reinforced high density polyethylene (HDPE) matrices, using a two-step reactive extrusion technology. The use of ethylene-glycidyl methacrylate (E-GMA) copolymer improved phase compatibility in the sub-micro-fibril blends (SMFBs) with 75% HDPE and 25% PET. Most of in situ formed PET fibrils were less than 500 nm in diameter. The PET fibrils obviously increased mechanical properties of the blend, especially the moduli. The subsequent addition of 40 wt.% wood flour did not influence the size and morphology of PET fibrils, and the fibrils and wood fibers had a synergic reinforcement effect on composite properties. Compared with the HDPE/wood composites, the SMFB/wood system had 65% higher tensile strength, 95% higher tensile modulus, 42% higher flexural strength, and 64% higher flexural modulus, respectively. The technology offers a way to use engineering plastics (i.e., PET) for high performance WPC manufacturing. 相似文献