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应用不等式估值法讨论了非线性脉冲时滞差分方程解的性质,并得到它的解的一致稳定性的一些充分条件. 相似文献
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A comparison of the field emission characteristics of vertically aligned graphene sheets grown on different SiC substrates 下载免费PDF全文
The field emission (FE) properties of vertically aligned graphene sheets (VAGSs) grown on different SiC substrates are reported. The VAGSs grown on nonpolar SiC (10-10) substrate show an ordered alignment with the graphene basal plane-parallel to each other, and show better FE features, with a lower turn-on field and a larger field enhancement factor. The VAGSs grown on polar SiC (000-1 ) substrate reveal a random petaloid-shaped arrangement and stable current emission over 8 hours with a maximum emission current fluctuation of only 4%. The reasons behind the differing FE characteristics of the VAGSs on different SiC substrates are analyzed and discussed. 相似文献
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利用Krönig-Penney 模型和形变势理论,从理论上探讨了纤锌矿型AlN/InN和AlN/GaN超晶格系统的能带结构及不同应变模式对能带结构的影响,计算得到了能带结构随各亚层参量变化的一般性规律、超晶格的能量色散关系、应变造成的影响以及不同亚层厚度的系统禁带宽度和导带第一子禁带宽度.研究发现,通过改变亚层厚度可以从不同形式设计能带结构,应变会改变系统禁带宽度,使带阶和子能带明显窄化,价带结构趋于复杂甚至生成准能带结构.与实验结果对比后发现,该模型适于模拟窄势阱结构超晶格,而对于宽势阱则必须
关键词:
AlN/InN和AlN/GaN超晶格
Krönig-Penney模型
应变
子能带 相似文献
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A self-powered sensitive ultraviolet photodetector based on epitaxial graphene on silicon carbide 下载免费PDF全文
A self-powered graphene-based photodetector with high performance is particularly useful for device miniaturization and to save energy.Here,we report a graphene/silicon carbide(SiC)-based self-powered ultraviolet photodetector that exhibits a current responsivity of 7.4 m A/W with a response frequency of over a megahertz under 325-nm laser irradiation.The built-in photovoltage of the photodetector is about four orders of magnitude higher than previously reported results for similar devices.These favorable properties are ascribed to the ingenious device design using the combined advantages of graphene and SiC,two terminal electrodes,and asymmetric light irradiation on one of the electrodes.Importantly,the photon energy is larger than the band gap of SiC.This self-powered photodetector is compatible with modern semiconductor technology and shows potential for applications in ultraviolet imaging and graphene-based integrated circuits. 相似文献
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电视监控系统是先进的防范能力极强的综合系统。随着多媒体技术及网络技术的发展,电视监控系统已经数字化,用以构建多媒体数字远程监控系统,充分利用资源,使系统发挥更大的作用。文章介绍了全数字化网络监控系统解决方案。 相似文献
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随着自组网性能的提升与大规模应用,其内部数据呈现出多模态特征,数据量更是达到了海量级别,为数据融合处理工作带来了极大的挑战。为此,提出基于数字孪生的自组网多模态数据快速融合方法。实时采集自组网数据后,利用NLM算法与卡尔曼滤波算法去除数据中的噪声与冗余信息。然后,构建数字孪生自组网(包括自组网、孪生网络与服务系统),从服务系统加载的数据中提取多模态数据特征,搭建双线性融合模型,从而实现对多模态数据的快速融合处理。实验表明:应用该方法后,多模态数据融合过程的时延始终保持在3 s以下,融合后多模态数据质量系数可达到0.9,证明该方法具有更优的数据融合性能。 相似文献