前端接触势垒高度对非晶硅和微晶硅异质结太阳电池的影响

运用AMPS-1D（Analysis of Microelectronic and Photonic Structures） 程序系统分析了前端接触（铟锡氧化物）的势垒分别对非晶硅和微晶硅太阳电池性能的影响,比较了两种影响的差异并分析了具体原因. 研究表明：与微晶硅相比,非晶硅受铟锡氧化物功函数Φ_ITO的影响更加显著. 随着Φ_ITO的增加非晶硅的各项物理性能（如太阳电池效率、填充因子等）得到明显改善,而微晶硅的各项参数虽然也随Φ_ITO增加而改变,但更容易趋于饱和. 模拟结果显示,在实际的太阳电池装备过程中可根据前端电极的性能来选择合适的p型硅材料. 关键词： 铟锡氧化物 非晶硅 微晶硅 计算机模拟     

基于LabVIEW激光引信回波模拟装置设计

激光引信回波模拟装置是激光引信测试设备的重要组成部分。介绍了激光引信回波模拟装置的组成,设计了用于该装置的硬件电路和软件控制系统。硬件电路采用单片机完成控制指令的接收和控制信号的产生,使用串行扩展芯片GM8125将单片机AT89S52的串行口扩展成5个,满足了激光引信回波模拟装置串口资源要求。软件控制系统基于LabVlFⅣ设计,主要包括串口通信程序和控制指令的产生程序,控制指令经串口通信传送给硬件电路。实验结果表明,该装置满足激光引信测试设备的要求。     

近场宽带电场耦合天线的高频结构模拟器软件仿真及性能分析

近场宽带电场耦合天线是一种新型的短距离、高速无线通信天线,它是索尼公司力推的近距离高速无线通信技术——.Transferjet^TM的工作天线.使用高频结构模拟器软件,对一种典型的近场宽带电场耦合天线进行了参数化的结构设计;通过仿真模拟,分析短截线的线长和线宽,以及耦合电极的面积对天线中心频率和工作带宽的影响;分析了天线间的距离和夹角,以及耦合电极的面积,对天线传输损耗和性能的影响.设计了一个满足Transferjet^TM技术指标的小尺寸天线,给出了性能仿真结果.     

基于586-Driver的无人机飞控计算机智能检测系统研制

传统飞控计算机检测方法以人工操作为主,存在一定的主观性且效率低下的缺点。采用信号门限检测技术,设计了飞控计算机一键式全功能检测方案。以586-Driver板卡为核心,设计了智能检测系统,实现了在全程无人干预情况下对飞控计算机按预设时序逻辑的自动检测。通过系统测试表明：满足某型飞控计算机的检测需求,提高了飞控计算机检测效率,具有实际工程应用价值。     

Structural modifications of diamond like carbon films induced by MeV nitrogen ion irradiation

Diamond-like carbon (DLC) films were deposited on Si(1 0 0) substrates using plasma deposition technique. The deposited films were irradiated using 2 MeV N⁺ ions at fluences of 1×10¹⁴, 1×10¹⁵ and 5×10¹⁵ ions/cm². Samples have been characterized by using Raman spectroscopy, X-ray photoelectron spectroscopy (XPS) and high-resolution transmission electron microscopy (HRTEM). Analysis of Raman spectra shows a gradual shift of both D and G band peaks towards higher frequencies along with an increase of the intensity ratio, I(D)/I(G), with increasing ion fluence in irradiation. These results are consistent with an increase of sp² bonding. XPS results also show a monotonic increase of sp²/sp³ hybridization ratio with increasing ion fluence. Plan view TEM images show the formation of clusters in the irradiated DLC films. HRTEM micrographs from the samples irradiated at a fluence of 5×10¹⁵ ions/cm² show the lattice image with an average interplanar spacing of 0.34 nm, revealing that the clusters are graphite clusters. The crystallographic planes in these clusters are somewhat distorted compared to the perfect graphite structure.     

Electronic structure of dysprosium silicide films grown on a Si(1 1 1) surface

The thickness-dependent electronic structures of Dy silicide films grown on a Si(1 1 1) surface have been investigated by angle-resolved photoelectron spectroscopy. Two (1×1) periodic bands, both of them cross the Fermi level, have been observed in the silicide films formed by Dy coverages of 1.0 monolayer and below, and more than five () periodic bands have been observed in thicker films. Taking the () periodic structure of Dy atoms in the submonolayer silicide film into account, the periodicity of the two metallic bands indicate that they mainly originate from the orbitals of Si atoms, which form a (1×1) structure. Of the () periodic bands observed in thick films, four of them are well explained by the folding of the (1×1) bands into a () periodicity. Regarding the other band, the three () periodic bands would originate from the electronic states related to the inner Si layers that form a () structure, and the one observed in the 3.0 ML film only might originate from the electron located at the interface between bulk Si and the Dy silicide film.     

Spectral flow invariants and twisted cyclic theory for the Haar state on

In [A.L. Carey, J. Phillips, A. Rennie, Twisted cyclic theory and an index theory for the gauge invariant KMS state on Cuntz algebras. arXiv:0801.4605], we presented a K-theoretic approach to finding invariants of algebras with no non-trivial traces. This paper presents a new example that is more typical of the generic situation. This is the case of an algebra that admits only non-faithful traces, namely SU_q(2) and also KMS states. Our main results are index theorems (which calculate spectral flow), one using ordinary cyclic cohomology and the other using twisted cyclic cohomology, where the twisting comes from the generator of the modular group of the Haar state. In contrast to the Cuntz algebras studied in [A.L. Carey, J. Phillips, A. Rennie, Twisted cyclic theory and an index theory for the gauge invariant KMS state on Cuntz algebras. arXiv:0801.4605], the computations are considerably more complex and interesting, because there are non-trivial ‘eta’ contributions to this index.     

Vibrational properties of the F A (Li+) center in alkali halides

Abstract

The on- or off-axis behavior and the vibrational properties of the F _A (Li⁺) center are investigated in several alkali halides by means of polarized resonant Raman scattering. The observed Raman modes are interpreted and classified according to their nature and frequency. A comparison between on- and off-axis systems and between the vibrational modes of the isolated Li⁺ and the F _A (Li⁺) center reveals a displacement of the Li⁺ equilibrium position parallel to the F _A (Li⁺) defect axis and, due to the small impurity size, away from the adjacent F center.     

Temperature dependent photoluminescence down to 4.2 K in EuTFC

The temperature dependence of photoluminescence in Europium tris[3-(trifluoro-methylhydroxymethylene)-(+)-camphorate] (EuTFC) embedded in polymer films has been examined from 40 K down to 4.2 K with the goal of preparing sensor films for low-temperature thermal imaging. The behavior of EuTFC showed significant difference when based on polystyrene compared to poly(n-alkyl methacrylate)s. In poly(n-alkyl methacrylate)s prepared by standard methods for imaging applications, the photoluminescence is fully saturated below 30 K, whereas in polystyrene films there is a strong temperature dependence even down to 4.2 K. By optimizing the preparation procedure for films made of poly(butyl methacrylate) (PBMA) and poly(methyl methacrylate), also these polymers became very sensitive down to liquid helium temperature. The maximum temperature sensitivity of EuTFC in PBMA is found to be 1.0%/K at 4.2 K. The problem of delamination and cracking of the polymer film at cryogenic temperature is also avoided by the special preparation method.     

基于国产CPU的并行冗余计算机系统研究

目前国家不断推进的国产自主可控信息系统建设,其核心国产计算机系统由于技术成熟度低、市场推广晚等原因,暴露出可靠性低、稳定性差的问题,直接导致系统功能无法成功应用。围绕国产化计算机系统的并行冗余架构开展研究,通过计算机系统架构的软硬件设计,以及高速缓存一致性架构、高速互联总线和三状态转换机制方法的应用,基于国产CPU 并行冗余计算机系统,可以有效消除备份计算机系统进行当班切换时,存在的切换时间延时和切换过程数据丢失的问题。通过试验验证,该系统可以完成计算机系统中CPU处理器和功能桥片故障模式的容错处理,并保障信息数据的完整性和实时性,有效提高设备中计算机系统的工作可靠性与稳定性。