共查询到14条相似文献,搜索用时 46 毫秒
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半导体桥火工品是取代桥丝的理想火工品。本文根据半导体桥的点火特性,应用电能转化为热能、热传导和炸药的热爆炸三个方面的理论,建立了在电容放电和直流输入两种方式下半导体桥桥体的升温特性方程;并通过计算机运算绘图,验证了方程基本符合理论要求。文章最后指出升温方程需加入修正系数来进一步完善。 相似文献
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文章讨论了半导体桥点火的作用机理.在比较、分析了几种常用的半导体桥结构的基础上,设计出一种新的SCB结构.从理论上讲,此种结构具有更好的点火性能.文章以SCB的典型结构--"H"形为例,对半导体桥结构的各组成部分进行了分析,论证了半导体桥厚度δ=2μm的合理性;根据能量转换关系建立了数学模型,得出了半导体桥长和宽的计算公式. 相似文献
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Semiconductor light‐emitting diodes (LEDs), especially GaN‐based heterostructures, are widely used in light illumination. The lack of inversion symmetry of wurtzite crystal structures and the lattice mismatch at heterointerfaces cause large polarization fields with contributions from both spontaneous polarization and piezoelectric polarization, which in turn results in obvious quantum confined stark effect. It is possible to alleviate this effect if the local electrostatic fields and band alignment induced charge redistribution can be quantitatively determined across the heterostructures. In this Concept, the applications of electron holography to investigate semiconductor LEDs are summarized. Following the off‐axis electron holography scheme, the GaN‐based LED heterostructures including InGaN/GaN‐based quantum wells, other GaN‐based quantum wells, and other forms of GaN‐based LED materials are discussed, focusing on the local potential drops, polarization fields, and charge distributions. Moreover, GaAs‐based LED heterostructures are briefly discussed. The in‐line electron holography scheme emphasizes the capability of large area strain mapping across LED heterostructures with high spatial resolution and accuracy, which is combined with quantitative electrostatic measurements and other advanced transmission electron microscopy characterizations to provide an overall nanometer scale perspective of LED devices for further improvement in their electric and optical properties. 相似文献
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半导体桥火工品的发展 总被引:8,自引:1,他引:7
文中系统评价和分析了近年来国内外半导体桥结构,制造工艺和封装技术,展望了半导体桥点火装置及智能火工装置的应用前景。提示了这类火工品必将得到广泛应用的趋势。 相似文献
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ESD危害涉及电子、石油、石化、汽车、国防和航空航天等众多领域,是影响产品质量、工程项目质量、安全生产和公共安全的重要因素,其标准化已得到众多国际组织的高度重视.本文对国内ESD领域国家标准、军用标准、行业标准的发展现状进行了全面调研,分析了表征研究对象类(TC或主题)标准化活跃程度的标准数量(S)和平均标龄(Y)等两个主要因子.通过对比国外标准发展现状,发现我国ESD标准发展存在主题类型不全面,标准体系不完善,管理体系标准适用面窄、时效性差,测试模型标准缺失等四方面的重要问题.建议从“产品-检测-认证-管理”等四个层次上,尽快对接国外先进标准,建设国家静电安全标准体系. 相似文献