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余瑾 《电子产品可靠性与环境试验》2015,33(2):57-59
设计审核是控制设计质量的第一道关口,加强设计审核,可以降低设计差错率。通过对设计审核过程的分析,探讨了对设计审核人员、过程和工具的管理方法,希望以此对设计审核质量的提高起到积极的作用。 相似文献
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Reversibility of Temperature-Induced Liquid Transition in Pb26Sn42Bi32 Melt: Experimental Evidence with Electrical Property 下载免费PDF全文
Exploring nature of liquid structures and properties is becoming more interesting in various fundamental and applied fields. With different resorts including the resistivity method, temperature-induced liquid-liquid structure transitions (TI-LLST) have been suggested and verified to occur in some liquid alloys, while the reversibility of TI- LLST has rarely been examined as yet. Unlike some other investigated liquid alloys, here we show that electrical resistivity of Pb26Sn42Bi32 melt exhibit an anomalous change in the first heating run and a reversible change in the following cooling and heating cycles. Taking account of the structural sensitivity of electrical resistivity, the abnormal patterns suggest two sorts of TI-LLST that are irreversible and reversible in the liquid ternary alloy, respectively. This interesting phenomenon together with other growing evidence imply that liquid structures and their change characteristics are multiform and complex. 相似文献
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