基于神经网络的油罐故障诊断系统的设计

针对加油站油罐故障难以判断的问题,提出了油罐故障诊断系统的研究方案,运用神经网络的方法,建立了油罐故障诊断系统模型,解决了油罐故障实时诊断的问题。     

含B闪锌矿三元系半导体BxIn1-xP和BxGa1-xP带隙理论预测

利用第一性原理计算方法,用广义梯度近似 (GGA) 处理电子之间的交换关联能,计算了BxIn1-xP,BxGa1-xP的带隙结构.BxIn1-xP的带隙弯曲参数b _Eg (Γ)=4.32eV,b_Eg(X) =1.8eV,它从直接带隙转变为间接带隙时B的含量为0.47;在小量B的掺入下,可使BxIn1-xP的带隙变小,在x=0.15时带隙达到最小值1.33eV.BxGa1-xP的带隙弯曲参数b_Eg(Γ)=1.37eV,b _Eg(X)=2.46eV,在整个组分内是间接带隙.BxIn1-x-P,BxGa1-xP有较大的带隙弯曲参数,是由于组成它们的二元系之间存在较大的晶格失配.     

Analysis and application of new quasi-network characteristics of nonuniform mesh in FDTD simulation

The equation of computing the reflection coefficient between two meshes of different sizes is derived. Using the equation, quasi-network characteristics of nonuniform mesh for the finite-difference time-domain technique is found and analyzed. The so-called mesh network (MN) here is a kind of structure composed of the sections of mesh in cascade. The cell sizes of these sections change regularly. By means of choosing the number of mesh sections, length of each section, and cell sizes, some novel network characteristics are obtained, which can be used to match the reflecting wave of nonuniform mesh or improve the transmitted characteristics for a mesh wave to travel along the nonuniform mesh. Formulas for analyzing the MN are given. The characteristics are realized in both one- and three-dimensional cases. The applications and advantages of the MN are shown by computing three different structures, i.e., microstrip-gap capacitor, parallel-coupling filter, and microstrip slot-line transformer.     

1.06μm大功率连续半导体激光器

利用金属有机化学气相淀积(MOCVD)技术,生长了InGaAs/AlGaAs分别限制压应变双量子阱和单量子阱两种材料结构,通过对不同腔长单管激光器的LIV测试获得内部参数,对单、双阱两种材料结构器件参数进行对比分析,确定了单量子阱结构作为1.06μm大功率半导体激光器的材料结构。通过研究单管激光器的电光转换效率与腔长、注入电流的关系,获得了最高达到57.5%的电光转换效率。对1mm腔长单管激光器进行了大电流高温加速老化测试,结果显示研制出的单管激光器室温下在1.5A工作电流下寿命远大于104h。     

EPON网络承载“我的e家”方案研究

本文深人分析了EPON网络的建设模式,研究了"我的e家"业务对宽带接入网的要求以及"我的e家"业务在EPON网络各种组网模式中的承载方案,并对EPON设备提出了新的技术要求.以实质性地推动中国电信"光进铜退"的发展.     

基于线性规划的关键面积最小化方法

随着集成电路(IC)技术的不断发展,尤其在90nm和65 nm技术节点,集成电路制造业的投资剧增而随机成品率却在下降.为了提升随机成品率,需要在布线或后布线阶段减小关键面积.文中提出一种基于线性规划降低关键面积的方法,使关键面积在一组条件约束下,通过版图中一些特征量的变化,建立起一个线性规划模型,然后求其最优解,进而得出关键面积的最小值.该方法的优点是把一个版图优化问题转化为数学问题,使问题更精确化,从而为成品率的优化提供了一条新途径.     

A review:Photonics devices,architectures,and algorithms for optical neural computing

The explosive growth of data and information has motivated various emerging non-von Neumann computational approaches in the More-than-Moore era.Photonics neuromorphic computing has attracted lots of attention due to the fascinating advantages such as high speed,wide bandwidth,and massive parallelism.Here,we offer a review on the optical neural computing in our research groups at the device and system levels.The photonics neuron and photonics synapse plasticity are presented.In addition,we introduce several optical neural computing architectures and algorithms including photonic spiking neural network,photonic convolutional neural network,photonic matrix computation,photonic reservoir computing,and photonic reinforcement learning.Finally,we summarize the major challenges faced by photonic neuromorphic computing,and propose promising solutions and perspectives.     

基于补偿特征图滤波算法去除光学相干层析造影成像俯视图的运动伪影

运动伪影是光学相干层析造影成像(OCTA)俯视图中的一个重要问题.提出一种补偿特征图像滤波(CEF)算法去除光学相干层析造影成像俯视图的运动伪影.首先,利用奇异值分解(SVD)将光学相干层析造影成像俯视图展开为一系列的特征图像;然后,利用高通特征图像和从第一特征图像中抽取得到的正交补偿积这两部分来重建恢复图像.实验结果...     

Strategies Toward Efficient Blue Perovskite Light-Emitting Diodes

Substantial progress has been made in blue perovskite light-emitting diodes (PeLEDs). In this review, the strategies for high-performance blue PeLEDs are described, and the main focus is on the optimization of the optical and electrical properties of perovskites. In detail, the fundamental device working principles are first elucidated, followed by a systematical discussion of the key issues for achieving high-quality perovskite nanocrystals (NCs) and quasi-2D perovskites. These involve ligand optimization and metal doping in enhancing the carrier transport and reducing the traps of perovskite NCs, as well as the perovskite phase modulation and defect passivation in improving energy transfer and emission efficiency of quasi-2D perovskites. The strategies for efficient 3D mixed-halide perovskite and lead-free perovskite blue LEDs are then briefly introduced. After that, other strategies, including effective charge transport layer, efficient perovskite emission system, and effective device architecture for high light outcoupling efficiency, are further discussed to boost the blue PeLED performances. Meanwhile, the testing standard of blue PeLED lifetime is suggested to enable the direct comparisons of the device operational stability. Finally, challenges and future directions for blue PeLEDs are addressed.