基于支路暂态势能函数的失步解列研究

电力系统遭受故障导致发电机组失去同步后,必须及时地解列控制平息振荡,防止系统崩溃。如何快速寻找系统的失步模式是解列控制的关键步骤之一。本文提出了基于支路暂态势能函数的失步模式实时判别方法。该方法首先通过量测各支路的两端电压相角差和流过支路的有功功率,然后将这些量测数据进行综合分析得到发电机组是否失步以及判断失步模式。基于得到的失步模式和快速的解列面搜索方法确定系统合适的解列断面。本文所提方法具有可操作性、实时性强的特点。对IEEE118节点系统进行了失步模式仿真搜索,仿真算例验证了方法的有效性。     

Additive-Free Energetic Film Based on Graphene Oxide and Nanoscale Energetic Coordination Polymer for Transient Microchip

Transient microchips have promising applications in data security and privacy protection. A simple fabrication process and short transient time are two crucial requirements for transient microchips. In this study, a facile drop-casting method is used to develop a transient microchip based on an energetic film and a microheater on a substrate. It is found that the graphene oxide-energetic coordination polymer composite based energetic film plays an important role in simplifying the fabrication process and achieving fast transient time due to its inherent film forming ability, strong binding to substrate, and highly energetic characteristics. The interlayer confinement effect of graphene oxide (GO) can significantly reduce the size of energetic coordination polymer (ECP) to nanometer scale. Van der Waals forces between GO layers and coordination bonds between GO and metal ions are responsible for the film formation ability. Furthermore, the reduction of ECP size and the compact stacking lay the foundation for the excellent combustion and pressure production performance of the energetic film. The strong adhesion of the energetic film and the substrate is confirmed by drop experiments. More importantly, the fabricated silicon based transient microchip can achieve self-destruction within 1 second.     

一种色度瞬态改善算法及其实现

介绍了数字电视中用来增强图像画质的一种常用方法——色度瞬态改善(CTI)。介绍了该方法的基本原理、常用算法和三星公司提出的一种新算法，并讨论了该算法的硬件实现方案和代价。     

新型光敏剂竹红菌甲素的强激光效应及电子激发态特性

有机功能分子在开发新型光电子材料和光动力疗法(PDT)光敏剂方面是一个重要的研究热点;竹红菌甲素(HA)分子属于激发态质子转移(ESIPT)型分子,具有丰富的激发态特性,且反应速度快,在新型激光染料和新型光电器件方面有一定的应用前景。观察了竹红菌甲素分子的激射现象,其发射激光的范围在620~800 nm;并利用激射效应的特点为强激光条件下的质子转移提供了进一步的依据。利用瞬态光栅技术研究了竹红菌甲素的电子激发态特性,把其瞬态光栅的超快过程归结为竹红菌甲素质子转移形成的过渡态TS*的衰减,并得出过渡态TS*瞬态光栅的寿命为10.5 ps。     

埋栅结构双极型静电感应晶体管动态特性的改善

双极型静电感应晶体管(BSIT)的失效经常出现在阻断态与导通态之间的瞬态过渡过程。因此,研究BSIT的开关动态过程的物理机理对于设计和制造高性能器件有着重要意义。本文深入研究了埋栅结构电力BSIT瞬态过程的动态特性,讨论了材料、几何结构与工艺参数对BSIT动态性能的影响。提出了一系列改善BSIT动态特性的工艺措施。     

原子氢辅助分子束外延生长以GaAs材料性能的改善

利用深能级瞬态谱（ＤＬＴＳ）研究了常规分子束外延和原子氢辅助分不外延生长的掺杂Ｓｉ和Ｂｅ的ＧａＡｓ同质结构样品中缺陷的电这特性。发现原以辅助分子束外延生长的样品中缺陷的浓度与常规分子束外延生长的样品相比有明显的降低,这可解释为生长过程中原子对缺陷的原位中和与钝化作用。     

资源性降水回灌系统设计方法初探

工程降水带来的地下水资源浪费问题受到了越来越多的关注,回灌与降水相结合则既可满足工程需要又可充分保护地下水资源。与工程降水设计不同,降水与回灌需统筹考虑开展一体化设计。本文通过探究降水与回灌系统设计方法与思路,为后续降水回灌研究提供参考。     

Hybrid FeNiOOH/α‐Fe2O3/Graphene Photoelectrodes with Advanced Water Oxidation Performance

In this study, the photoelectrochemical behavior of electrodeposited FeNiOOH/Fe₂O₃/graphene nanohybrid electrodes is investigated, which has precisely controlled structure and composition. The photoelectrode assembly is designed in a bioinspired manner where each component has its own function: Fe₂O₃ is responsible for the absorption of light, the graphene framework for proper charge carrier transport, while the FeNiOOH overlayer for facile water oxidation. The effect of each component on the photoelectrochemical behavior is studied by linear sweep photovoltammetry, incident photon‐to‐charge carrier conversion efficiency measurements, and long‐term photoelectrolysis. 2.6 times higher photocurrents are obtained for the best‐performing FeNiOOH/Fe₂O₃/graphene system compared to its pristine Fe₂O₃ counterpart. Transient absorption spectroscopy measurements reveal an increased hole‐lifetime in the case of the Fe₂O₃/graphene samples. Long‐term photoelectrolysis measurements in combination with Raman spectroscopy, however, prove that the underlying nanocarbon framework is corroded by the photogenerated holes. This issue is tackled by the electrodeposition of a thin FeNiOOH overlayer, which rapidly accepts the photogenerated holes from Fe₂O₃, thus eliminating the pathway leading to the corrosion of graphene.     

暂态社区感知的ICWN数据转发机制

为了有效解决间断连接无线网络中的数据转发问题,提出了一种暂态社区感知的数据转发机制,运用半马尔可夫链模型描述节点在多个地理位置间的转移过程,预测节点在未来相遇的时间概率分布,确定节点相遇位置和时间,为下一跳中继节点的选择提供了理论依据。实验数值表明,与传统算法相比,所提机制能有效提高节点相遇预测的准确性,在数据成功投递率和传输时延等性能上都有较大的提升。     

基于暂态故障信息的多功能一体化智能电子设备

提出一种基于暂态故障信息的集成输电线路保护、测距、录波和测控等多种功能的智能电子设备。硬件方案采用多CPU分布式结构,主要包括以下模块：过程层通信模块、保护模块、测距录波模块、测控模块、站控层通信模块和人机接口模块。暂态故障信息的利用主要体现在保护模块和测距录波模块中,详细介绍了暂态故障信息的利用方法。为了满足智能变电站发展的要求,采用了一些关键技术。该多功能一体化智能电子设备适用于现有的智能变电站,能够提高保护性能和测距精度,降低设备成本和运行维护费用。