紫砂陶土及其应用

0前言从紫砂的起源、发展、沿承以及本人近二十多年的创作体会来说,紫砂的魅力首先在于它特殊的材质美,这也是紫砂陶之所以盛行,深受人们喜爱的原因。     

基于混沌分析的导弹惯性器件非线性故障预报

通过一定方法对陀螺仪的性能进行预测,是提高惯性器件的精度及保证整个控制系统可靠性的有效方法之一,论文在分析基于混沌分析的非线性预测方法的基础上,将陀螺仪误差系数随时间的漂移看作一个混沌过程,利用陀螺仪漂移测试数据进行相空间重构,在重构的相空间上,用基于最大Lyapunov指数的混沌预测方法对陀螺仪漂移进行预测,提出了一种新的基于混沌分析的陀螺仪漂移性能预报方法;通过基于MATLAB仿真实验证明,与经典的基于马尔可夫的预测方法相比该方法有更好的预测效果.     

A study of Reduced-Rank stap

This paper starts with the discussion of the principle of Reduced-Rank (RR) Space-Time Adaptive Processing (STAP). It is followed by a dedication of the upper bound performance of all eigen-based RR methods provided by Cross Spectral Method (CSM) under the condition of a given processor rank and an identical secondary sample size. A performance comparison between two RR STAP processors with prefixed structure and CSM is performed by the means of simulations. It is shown that the performance of time pre-filtering followed by jointly localized STAP structure (i.e. 3DT-SAP) is very close to the upper bound and thereby it is an effective RR approach.     

On clutter dof for phased array airborne early warning radars

In recent years, considerable attention has been paid to adaptive clutter suppression for airborne early warning (AEW) radars. A necessary condition for efficient clutter suppression is that the number of adaptive degrees of freedom (DOF) is no less than that of clutter DOF. This paper analyzes the DOF of clutter for phased array AEW radars. The new results obtained here are helpful to design and adaptive system for clutter suppression.     

有线接入型业务资源配置规则及技术实现方法研究

针对有线接入型业务的资源配置规则进行分析,通过归纳总结系统现有配置规则,分析不同规则形成的条件要素,找到配置规则的合理管理办法,建立资源配置的经验库,并提供规则应用的分析方法,使得配置规则能更好地应用于资源系统.     

[110]晶向近本征硅单晶双光子吸收各向异性

以沿[110]晶向切割的近本征硅单晶为样品,通过研究样品对连续波固体激光器所产生的1.3μm的近红外光的双光子吸收所诱导的光电流对入射光偏振方向的依赖关系,研究了双光子吸收的各向异性.测得了硅单晶对该波长的光的三阶极化率张量χ(3)的各向异性系数为-0.25,两个独立分量的比值χxxxx/χxxyy的幅度为2.4,并基于前期工作所得的χxxyy的结果,进而确定了另一分量χxxxx的值大约为1.49×10-19m2/V2.     

基于DSP的FDD-LTE PUSCH频偏估计的实现

频偏估计是FDD-LTE(频分双工长期演进)系统接收端的重要模块之一。文章介绍了FDD-LTE系统上行信道解调参考信号的产生原理以及时频位置映射方式,通过对硬件性能的评估,采用基于导频的残留频偏估计算法提出了一种PUSCH(物理上行共享信道)频偏估计实现方案。通过分析其实现复杂度和定点运算误差,表明该方案可以满足实时处理的要求,并具有较好的性能。     

基模螺旋天线的研究

本文提出了一种计算基模螺旋天线的新方法.该方法采用螺旋线段对基模螺旋天线进行划分,只需少量分段就可用矩量法对其进行精确模拟分析.文中求出了螺旋天线上的电流分布和远场方向图,与直线段模拟计算结果吻合良好.求阻抗矩阵 Z时,利用螺旋天线的对称性和周期性,只需求出一小部分元素就可得到Z 矩阵的其它元素的值.该方法分段数少,使得计算时间和计算所需存储量大大减小,计算速度和精度显著提高.     

Binary Controls on Interfacial Magnetism in Manganite Heterostructures

The complex interfacial correlations provide new routes toward tunable functionalities. Here, the wide range of tunabilities for magnetic properties are presented, including Curie temperature (from 245 to 320 K), coercive field (from 2 to 205 Oe), and saturated magnetic moment (from 0.9 to 2.8 µ_B Mn^?1), in a 9‐unit‐cell La_2/3Sr_1/3MnO₃ (LSMO) layer via modifying interfacial boundary conditions. Moreover, the LSMO/PbTiO₃‐based multilayers and superlattices that consist of PbTiO₃/LSMO/NdGaO₃ and PbTiO₃/LSMO/PbTiO₃ interfaces are characterized by two distinct Curie temperatures and coercive fields. The results reveal the feasibility of the interface‐resolved strategy based on boundary modification in fabricating potential devices with multiple accessible states for information storage. The wide‐range modulations on magnetic properties at LSMO/titanate interfaces are explained in terms of binary controls arising from the oxygen octahedral coupling (OOC) and magnetoelectric coupling (MEC). The results not only shed some light on understanding interfacial correlations in oxide heterostructures, but also pave an alternative path for exploring multiple accessible states in all‐oxide‐based electronic devices.     

2～5μm InAs/GaSb超晶格红外探测器

采用分子束外延方法在GaSb和GaAs衬底上生长了不同周期厚度的InAs/GaSb高质量Ⅱ型能带结构超晶格红外探测器,其探测波长覆盖2～5 μm红外波段.采用高分辨透射电子显微镜、原子力显微镜、X射线衍射测试、室温与低温光电流响应谱及室温与低温光荧光谱等多种测试手段检验了分子束外延生长在不同衬底上的超晶格材料质量与光学...