谐波提取理论的实践

介绍体效应器件的谐波工作机理和“基波振荡，谐波提取”的理论，根据该理论完成了6mm信号的放大和倍频，成功的设计了从X波段到3mm波段的八倍频组件，大大节约了雷达系统的成本和体积，实现了系统要求的性能。     

Vertical Nonvolatile Schottky-Barrier-Field-Effect Transistor with Self-Gating Semimetal Contact

Emerging 2D nonvolatile Schottky-barrier-field-effect transistors (NSBFETs) are envisaged to build a promising reconfigurable in-memory architecture to mimic the brain. Herein, a vertically stacked multilayered graphene (MGr)-molybdenum disufide (MoS₂)-tungsten ditelluride (WTe₂) NSBFET is reported. The semimetal WTe₂ with the charge-trapping effect enables the simultaneous integration of the electrode and the self-gating function. The effective Schottky barrier height offset ΔΦ_B is programed from ΔΦ_B-p = 132.6 meV to ΔΦ_B-n = 109.4 meV, inducing the reversed built-in electric field to make the NSBFET, so as to provide one with a multifunctional platform to integrate the nonvolatility and the reconfigurable self-powered photo response. The reversible open-circuit voltages of NSBFET synapse are programmed from −0.1 to 0.25 V and the self-powered responsivity with reversed signs is tuned from 290 to −50 mA W⁻¹, which enables the representation of a signed weight in a single device to enrich multiple optical sensing and computing capabilities.     

Generalised nearest feature line for subspace learning

Nearest feature line (NFL) is a powerful tool in pattern recognition, which generalises the representational capacity of available prototypes by using linear interpolation and extrapolation between the feature points. NFL is generalised to subspace learning so that the obtained subspace has desirable discriminating ability. Experiments on face recognition demonstrate its effectiveness.     

番茄黄瓜菜汁豆腐加工工艺

以番茄汁、黄瓜汁和大豆为原料研制了色泽美观的天然、营养豆腐,丰富了豆腐的品种,有良好的发展前景。     

饲料混合误差分析方法

简介混合技术发展研究现状,提出了饲料混合机混合误差的概念,给出了混合误差的来源与置信区间,并推导出可用于评估饲料混合均匀度测量误差的计算式。     

基于综合仿真技术解决电力系统业务质量评价的方法

在实际工作中,业务系统运行质量及管理质量与网络质量的好坏密不可分,网络建设过程中对网络规模、建设需求与网络安全可靠性、资源使用情况等方面有着不同程度的要求,网络的升级改造、日常维护以及调度管理均对网络的质量有相应的评价标准和考核要求,为了提升电力运营管理、实现可靠性管理,需要结合相应业务管理指标需求,运用电力通信运行管理业务质量及应用模式仿真模型,对运行质量评价目标、动态风险评估管理、网络中故障和缺陷计分等进行业务质量评价.采用基于综合仿真技术解决业务质量评价的方法,实现业务质量评价管理及考核的结果验证,对于提升业务系统管理有重要的作用.     

利用PtOEP掺杂改善Spiro发光器件的发光效率

为了利用有机三线态发光提高有机发光器件的发光效率,用磷光材料掺杂到聚合物主体中作为发光层,制备有机电致发光器件.在测量器件的电流-电压特性、发光亮度-电压特性和电致发光谱的基础上,计算了器件的外量子效率,研究了磷光材料的掺杂浓度对器件发光效率的影响.结果表明,对特定的材料体系,适当控制掺杂浓度,可以同时观察到荧光和磷光光谱,使掺杂器件的外量子效率在纯聚合物发光器件的基础上得到明显提高.     

iPTT: peer‐to‐peer push‐to‐talk for VoIP

This paper proposes iPTT, a peer‐to‐peer (P2P) Push‐to‐Talk (PTT) service for Voice over IP (VoIP). In iPTT, a distributed and mobile‐operator independent network architecture is presented to accelerate the deployment of the PTT service. Based on the serverless architecture, we develop two mechanisms, that is, flooding‐based floor control mechanism (FFC) and tree‐based floor control mechanism (TFC), for real‐time talk‐burst determination. The determination algorithms and the corresponding message flows for these two mechanisms are designed to show the feasibility of FFC and TFC. The performance of FFC and TFC is investigated through our analytical and simulation models in terms of the determination latency and the number of floor‐control message exchanges. Copyright © 2008 John Wiley & Sons, Ltd.     

用SystemView产生超宽带脉冲信号

本文介绍了超宽带无线通信系统(UWB)的基本原理,主要特点以及它所涉及的关键技术,目前产生UWB脉冲信号的方法。并提出了一种用SystemView产生UWB信号的方法,最后给出了结果。     

一种MQAM信号的识别算法

由于MQAM信号的概率密度函数服从莱斯分布，从而用莱斯分布来构造识别算法。在信噪比满足SNR≥13db的条件下，识别性能良好。