雷达与电子支援措施异步抗差航迹关联算法

针对雷达与电子支援措施(ESM)存在系统误差、航迹异步等复杂条件下的航迹关联问题,该文提出一种基于区间序列离散度的异步抗差航迹关联算法.定义混合区间序列的离散信息度量,给出系统误差的区间化方法,通过计算区间离散度并利用经典分配法进行关联判定.与传统算法相比,可在系统误差存在的前提下无需时域配准对异步航迹直接关联,且对噪...     

一种基于树形结构显示关联数据的设计

论述了在程序设计过程中 ,使用树形控件、SQL 语句、临时表等多种手段 ,达到多个关联数据库的数据由一个可视化树形结构控件显示的方法和技巧     

电网故障时双馈风力发电机励磁改进控制策略

双馈风力发电机（DFIG）在风能捕获过程中,传统的定子磁链定向控制都假定电网上的电压恒定不变,定子磁链也恒定不变,没有考虑定子励磁电流的动态响应过程,这个误差在电网故障时会对系统产生极不稳定的作用。为此应考虑该响应过程,对控制檳型进行修正,提出一种应对电网电压跌落时的励磁改迸策略,即在建立转子侧变换器控制模型时,把反映励磁电流过渡过程的定子电压变化量考虑进来。通过推导定子磁场定向下的转子电压方程,搭建定子磁链定向矢量控制模型,经过仿真结果比较,说明在加入励磁补偿电压项后,风电系统在应对电网电压故障时的电流控制性能得到明显改善,有效提升了系统的低电压穿越能力。     

基于傅里叶变换的LED单元板均匀性评价方法

亮度均匀性是LED单元板图像质量评价的一项重要指标,而现有的均匀性评价方法存在测量精度低、评价结果不全面等缺点。文中对LED单元板的均匀性评价方法进行了改进,利用傅里叶变换的方法对单元板的均匀性做出了更加合理的评价。利用此方法不仅将灯点的亮度差考虑在内,而且考虑了灯点的位置,因此评价更接近实际。     

1.5kW户用光伏高频逆变器研制

分析了一种具有中间储能环节的高频隔离逆变拓扑结构,该电路能实现前后级解耦,适用于光伏发电系统。前级DC/DC高频升压电路基于有限双极性调制,实现升压功能;后级采用双极性SPWM逆变技术,结合电压平均值反馈使输出电压稳定。详细介绍了高频变压器和LC滤波电路的设计方法,最后搭建了1.5k W高频逆变实验平台,实验结果显示,逆变器具有输出电压稳定,波形畸变小等优点。     

光电自准直系统的建模方法研究

针对现有自准直模型包含系统信息量有限的不足,提出了一种基于厚透镜对光线变换的建模方法.以应用光学中厚透镜对光线变换的理论为基础,结合矢量运算和坐标系旋转方法建立了光电自准直系统数学模型.通过数值仿真,对模型中包含的平面镜的转角、透镜的厚度、焦距及表面曲率半径、光源和探测器位置等系统主要参数对光电自准直系统的成像影响进行了分析,并通过对像点几何中心的提取,分析了透镜成像畸变对光电自准直系统测量精度的影响.文章建立的模型,为系统参数的提取和优化、分析像点轨迹变化的影响因素以及自准直测量误差的分析和补偿提供了理论支持.     

Mitigating Ion Migration with an Ultrathin Self-Assembled Ionic Insulating Layer Affords Efficient and Stable Wide-Bandgap Inverted Perovskite Solar Cells

Wide-bandgap perovskite solar cells (PSCs) are attracting increasing attention because they play an irreplaceable role in tandem solar cells. Nevertheless, wide-bandgap PSCs suffer large open-circuit voltage (V_OC) loss and instability due to photoinduced halide segregation, significantly limiting their application. Herein, a bile salt (sodium glycochenodeoxycholate, GCDC, a natural product), is used to construct an ultrathin self-assembled ionic insulating layer firmly coating the perovskite film, which suppresses halide phase separation, reduces V_OC loss, and improves device stability. As a result, 1.68 eV wide-bandgap devices with an inverted structure deliver a V_OC of 1.20 V with an efficiency of 20.38%. The unencapsulated GCDC-treated devices are considerably more stable than the control devices, retaining 92% of their initial efficiency after 1392 h storage under ambient conditions and retaining 93% after heating at 65 °C for 1128 h in an N₂ atmosphere. This strategy of mitigating ion migration via anchoring a nonconductive layer provides a simple approach to achieving efficient and stable wide-bandgap PSCs.     

采用地盘管采暖卫生间防水施工技术及质量控制

主要阐述了采用地盘管采暖卫生间防水施工技术的工艺流程及质量控制措施等.     

Simulated Microgravity Increases the Permeability of HUVEC Monolayer through Up-Regulation of Rap1GAP and Decreased Rap2 Activation

Space microgravity condition has great physiological influence on astronauts’ health. The interaction of endothelial cells, which control vascular permeability and immune responses, is sensitive to mechanical stress. However, whether microgravity has significant effects on the physiological function of the endothelium has not been investigated. In order to address such a question, a clinostat-based culture model with a HUVEC monolayer being inside the culture vessel under the simulated microgravity (SMG) was established. The transmittance of FITC-tagged dextran was used to estimate the change of integrity of the adherens junction of the HUVEC monolayer. Firstly, we found that the permeability of the HUVEC monolayer was largely increased after SMG treatment. To elucidate the mechanism of the increased permeability of the HUVEC monolayer under SMG, the levels of total expression and activated protein levels of Rap1 and Rap2 in HUVEC cells, which regulate the adherens junction of endothelial cells, were detected by WB and GST pull-down after SMG. As the activation of both Rap1 and Rap2 was significantly decreased under SMG, the expression of Rap1GEF1 (C3G) and Rap1GAP in HUVECs, which regulate the activation of them, was further determined. The results indicate that both C3G and Rap1GAP showed a time-dependent increase with the expression of Rap1GAP being dominant at 48 h after SMG. The down-regulation of the expression of junctional proteins, VE-cadherin and β-catenin, in HUVEC cells was also confirmed by WB and immunofluorescence after SMG. To clarify whether up-regulation of Rap1GAP is necessary for the increased permeability of the HUVEC monolayer after SMG, the expression of Rap1GAP was knocked down by Rap1GAP-shRNA, and the change of permeability of the HUVEC monolayer was detected. The results indicate that knock-down of Rap1GAP reduced SMG-induced leaking of the HUVEC monolayer in a time-dependent manner. In total, our results indicate that the Rap1GAP-Rap signal axis was necessary for the increased permeability of the HUVEC monolayer along with the down-regulation of junctional molecules including VE-cadherin and β-catenin.     

计及碳市场和绿证市场的配电网投资效益动态评估

随着碳排放权交易机制和绿证交易机制的持续完善,配电网投资效益评估需综合考虑电力市场与碳市场及绿证市场间的交互影响。建立电-碳-绿证市场协同运营架构,剖析碳市场、绿证市场对配电网投资决策的因果反馈关系。从发购电、碳排放权交易、绿证交易、可再生能源消纳责任权重和投资效益5个层面搭建系统动力学子模块,提出计及碳市场和绿证市场耦合关系的配电网投资效益动态评估模型。算例仿真结果表明,所提模型在提高配电网投资效益的同时可减少碳排放以及提高可再生能源消纳责任权重。