Strong near-field couplings of anapole modes and formation of higher-order electromagnetic modes in stacked all-dielectric nanodisks

We theoretically study the near-field couplings of two stacked all-dielectric nanodisks, where each disk has an electric anapole mode consisting of an electric dipole mode and an electric toroidal dipole (ETD) mode. Strong bonding and anti-bonding hybridizations of the ETD modes of the two disks occur. The bonding hybridized ETD can interfere with the dimer's electric dipole mode and induce a new electric anapole mode. The anti-bonding hybridization of the ETD modes can induce a magnetic toroidal dipole (MTD) response in the disk dimer. The MTD and magnetic dipole resonances of the dimer form a magnetic anapole mode. Thus, two dips associated with the hybridized modes appear on the scattering spectrum of the dimer. Furthermore, the MTD mode is also accompanied by an electric toroidal quadrupole mode. The hybridizations of the ETD and the induced higher-order modes can be adjusted by varying the geometries of the disks. The strong anapole mode couplings and the corresponding rich higher-order mode responses in simple all-dielectric nanostructures can provide new opportunities for nanoscale optical manipulations.     

基于SiPESC平台的模态综合法研究及实现

模态综合法作为主流的动力子结构方法,可在有效的精度下缩减整体结构的自由度,特别是对大型复杂结构的动力计算具有较高的效率,已被集成到许多商业CAE软件中,因此把它集成到SiPESC平台上是一项很有意义的工作.本文实现了两种模态综合法的集成,分别是Craig-Bampton方法、多层Craig-Bampton方法.研究工作同时提出了一种高效的子结构界面点搜寻算法,所实现的Craig-Bampton方法考虑了子结构的旋转及平移,多层Craig-Bampton方法可以考虑各种多层子结构的划分方式.SiPESC平台是由大连理工大学开发的新一代的有限元数值计算软件平台,它利用了新型的软件架构和程序设计思想,因此在SiPESC平台上进行程序设计开发是十分方便的.通过构建数值算例同Nastran的计算结果进行对比,数值算例验证了本文实现方法的正确性和有效性.     

Android平台MMS／SMS的PDU编码研究

因为当前Google的Android操作系统大为盛行,所以像短信、通话这些移动平台的基本通信功能就显得格外关键。PDU编码,作为一种较为先进的信息编码方式正为广大技术开发人员所接受,本文研究了SMS发送PDU的编码过程,并且结合实例对编码原理进行剖析,验证了PDU编码的可行性。     

基于路径遍历算法的SoC总线测试矢量集压缩

多跳变(MT)故障模型是目前提出的具有完整故障覆盖率的一种总线测试故障模型,但其测试矢量集存在严重的矢量冗余。提出了一个基于路径遍历算法的测试矢量压缩方法,以MT模型为基础,经压缩简化后得到更适用于SoC总线测试的BMTC故障模型。实验结果表明,使用提出的压缩方法,可以在保证MT模型故障覆盖率不变的情况下,将测试矢量数减少至原来的1/8,从而大大节省总线测试成本,提高测试效率。     

As2S8非晶态薄膜波导光学截止效应研究

报告了As2S8非晶态薄膜波导的光学截止（optical-stopping)效应的实验过程，初步结果和机理分析，介绍了硫系非晶态As2S8薄膜波导的制备工艺。以及实验光路和光学截止现象的过程，在实验基础上，结合有关硫系非晶态半导体中的其他一些光诱起现象的报道，我们提出了以微结构变动为前提，结合半导体能级理论的电子泵浦模型，解释了实验现象。     

Photoluminescence of a ZnO/GaN Heterostructure Interface

Growth of a ZnO/GaN heterostructure is carried out using pulsed laser deposition. By etching the ZnO layer from the ZnO/GaN structure, the photoluminescence （PL） of the associated GaN layer shows that the donor- acceptor luminescence of CaN shifts to about 3.27eV, which is consistent with the electroluminescence （EL） of n-ZnO/p-GaN already reported. XPS shows that oxygen diffuses into the CaN crystal lattice from the surface to 20nm depth. The PL spectra at different temperatures and excitation densities show that oxygen plays the role of potential fluctuation. The associated PL results of the interface in these LEDs could be helpful to understand the mechanism of EL spectra for ZnO/CaN p-n junctions.     

ATS中的光栅笔划信号产生和检测技术

光栅笔划叠加画面显示器广泛地应用于航空显示。采用专用测试设备检测光栅笔划叠加显示信号的方法,不能满足ATS设计综合化、通用化和标准化的需求。为了解决这一问题,根据光栅笔划叠加显示信号各分量信号之间的时序关系,利用ATS通用仪器资源有机组合,产生和检测光栅笔划叠加显示信号。该方法与传统的专用设备检测方法相比,能很好地满足自动测试系统(ATS)设计要求。     

商模Nφ上解析Toepltz算子的约化子空间

假设Tn表示多圆盘,H2(Tn)表示Tn上的Hardy空间.K表示H2(Tn)中由{(z1φ(z2))f1+…+(z1-φ(zn))fn-1:fi∈H2(Tn),1≤i≤n-1}生成的子模,Nφ表示K在H2(Tn)中的商模.则Nφ上以有限Blaschke乘积ψ(z)为符号的Toeplitz型算子Tψ是可约的.     

Dielectric Analysis of Dynamic Fouling Behavior on Surface of Polyethersulfone Composite Ultrafiltration Membrane

基于界面极化与静电场理论建立了聚醚砜复合超滤膜表面污染层与溶液体系的介电解析模型. 应用参数敏感性分析和介电测量研究了体系中浓差极化层与滤饼层的厚度与电导率对超滤体系介电弛豫的影响机制. 结果表明超滤过程中浓差极化层能快速建立,而滤饼层的形成是一个增长与剥蚀的动态过程;并且浓差极化层与滤饼层的电学性质是影响超滤体系介电谱的关键因素. 比较介电测量与模拟结果证实了建立的超滤体系介电解析模型能够有效可靠地描述与解释超滤体系产生介电驰豫的机制.     

Study of η and η＇ physics at BES-III

Decays of both η and η＇ provide very useful information in our understanding of low-energy QCD, and experimental signatures for these decays would be extremely helpful at BES-III. The rare decays of the η and η＇ mesons could serve as a low-energy test of the Standard Model and its beyond. The sensitivities of the measurements of η and η＇ decays are discussed at BES-III, in which the η and η＇ mesons are produced in the ψ decays.