共查询到20条相似文献,搜索用时 78 毫秒
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硅对GH907合金基体γ及γ′稳定性产生显著性影响。Si含量高于0.45at%,合金中析出颗粒状laves相,且随Si含量增加,ε,Laves等第二相数量增多。 相似文献
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人工神经网络在单晶合金设计中的应用 总被引:1,自引:0,他引:1
把一种新发展的功能极强的信息处理技术-计算机人工神经网络技术用于单晶合金的高温持久性能预测并和其它方法进行比较,结果表明:这种方法精度最高。 相似文献
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光诱导电子转移理论及其在分子开关上的应用进展 总被引:3,自引:1,他引:3
电子的激发使分子内给体和受体之间发生电子转移(ET),从而生成不同于初始状态的电荷分离态(CT)。两种态如果具有一些可测光物理性能的差别,就可以用于作为分子开关(MolecularSwitches)。这种分子开关表现出非常优异的开关性能。本文对有机分子开关和分子内电子转移的基本理论作了较为全面的描述,并阐述了这一电子转移的理论在分子开关上的应用。 相似文献
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合金元素在12Cr1MoV固溶体中贫化的电子理论分析 总被引:2,自引:0,他引:2
计算了12CrlMoV中α—Fe、α—Fe—Me单元从20℃到700℃的价电子结构及键能。通过对比α—Fe单元的B键和α-Fe-Me单元的C键这两个等同键的价电子结构参数及键能,从价电子层次,对12CrlMoV固溶体中合金元素的贫化进行了分析。发现同温下Mo贫化的最严重,Cr其次,V几乎不变,而且随温度升高,各种合金元素的贫化加剧。 相似文献
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利用正电子湮没技术测量了纯金属Ni、Co、Cr以及3种不同成分的Ni-Co-Cr合金的正电子湮没辐射Doppler展宽谱,分析了形成Ni-Co-Cr合金时3d电子的作用.结果表明,3种纯金属中Ni的3d电子信号较强,当增大Ni-Co-Cr合金中Ni原子的比例时,导致正电子与自由电子湮没的几率增加和合金中的金属键增强,从而提高了合金的韧性.Ni-Co-Cr合金的实验熵谱与其合成熵谱保持了较好的一致性,表明Ni-Co-Cr合金中不同原子之间主要以金属键相结合,这也成为Ni-Co-Or合金具有较好金属延展性的重要原因. 相似文献
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Axiomatic Design Theory for Systems 总被引:10,自引:1,他引:10
Nam P. Suh 《Research in Engineering Design》1998,10(4):189-209
A general theory for system design is presented based on axiomatic design. The theory is applicable to many different kinds
of systems, including machines, large systems, software systems, organizations, and systems consisting of a combination of
hardware and software. Systems are represented by means of a system architecture, which takes the form of the {FR}/{DP}/{PV}hierarchies, a ‘junction-module’ diagram, and the ‘flow diagram’. The ‘flow diagram’ for system architecture concisely represents
the system design, the relationship among modules, and the control sequence in operating systems. The flow diagram of the
system architecture can be used for many different tasks: design, construction, operation, modification, and maintenance of
the system. It should also be useful for distributed design and operation of systems, diagnosis of system failures, and for
archival documentation. 相似文献
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Jun ZHANG Yu ZHANG Li LI Guoqiang LIN Chuang DONG 《材料科学技术学报》2006,22(5):639-642
An empirical formula for composition demixing analysis in cathodic arc ion plating using alloy target is established based on the concepts of average charged state and relative demixing parameter. The level of composition demixing effect is presented by demixing degree of one element. For binary constituent alloy target, the composition change trend in coating is discussed and the limit of demixing degree for each element is determined. The content of one element with higher average charged state gets larger in coating than in alloy target, at meantime, the content of one element with lower average charged state gets less. For each one of the two constituents, the less the atom percent in alloy target, the larger the difference of its contents between the coating and the target. For triple constituent alloy target, the content change of one element with moderate average charged state is discussed in detail. Its content in coating getting larger or less is determined by the combination result of the contents of the other two elements in alloy target. For a given content of the element with moderate average charged state in triple alloy target, the content deviation level of that element from coating to alloy target will be not larger than that using binary alloy target containing only that element and one of the two others. According to the wanted coating composition, the composition design of alloy target is easily deduced from the formula. 相似文献
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信息设计技术的理论与基础 总被引:2,自引:2,他引:2
建立于工业化大生产基础之上的工业设计随着信息时代的来临,在设计观念和设计手段上必将会发生重大的变勒。信息设计是在新形势下工业设计领域中迅速发展起来的边缘性学科方向,在新技术背景下对信息设计的产生、内涵、运作模式、技术基础等方面的理论和方法进行了研究和探讨。 相似文献
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M. Yu. Shvaiko 《Materials Science》2002,38(4):590-605
We present a survey of the results of investigations carried out by M. Ya. Leonov and his followers in the field of the theory of plasticity and its applications to the solution of boundary-value problems and problems of stability of rods, plates, and shells under simple and complex loading. It is shown that the influence of the memory of materials on the stability of structural elements can be significant. We also establish the relationship between the proposed theory of plasticity based on the concept of slip and the well-known theories of plastic flow and low elastoplastic strains. 相似文献
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对我国自行研制的新型高弹性合金3YC42的不同工艺状态的组织进行了透射电镜研究,为合金设计与加工工艺的优化提供了理论与实验基础,证实了保证航天工程用特殊弹簧部件全面服役性能质量的材料设计方法的成功。 相似文献
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平面设计及其设计元素的本土化与再造 总被引:1,自引:3,他引:1
中国的平面设计在关注国际化与多元化的同时,更要充分重视挖掘我国传统特色的造型元素,立足于本土文化,这样才能形成持续的竞争力.在设计元素的再造中,除了利用传统元素与现代设计理念相结合,还可对传统元素进行自身形态上的改造. 相似文献