计及最恶劣场景概率和供需灵活性的综合能源系统分布鲁棒低碳优化调度

随着可再生能源渗透率的提升,其不确定性给综合能源系统(integrated energy system, IES)的经济性和鲁棒性带来了极大挑战。为了促进可再生能源消纳以及降低碳排放量,提出了一种基于数据驱动的分布鲁棒优化(distributionally robust optimization, DRO)调度策略。首先,构建了由有机朗肯循环(organic Rankine cycle, ORC)、氢燃料电池和电动汽车等构成的供需灵活响应模型,并引入阶梯碳交易机制来约束系统碳排放量。其次,为了能获取最恶劣情况下的场景概率分布,采用综合范数对风电输出场景的概率分布置信集合进行约束。然后,以在最恶劣场景概率分布下综合能源系统运行总成本最低为目标建立两阶段鲁棒优化模型,并通过列和约束生成(column and constraint generation, CCG)算法对模型进行迭代求解。最后,算例仿真结果表明了所提模型和求解方法的有效性,并分析了阶梯碳交易机制和供需灵活响应模型对提高系统灵活性和低碳经济性的影响。     

拐枣枝多糖提取工艺优化与其抗氧化性研究

为确定拐枣枝多糖的生物活性,对拐枣枝多糖提取工艺进行优化,并评价其体外抗氧化性强弱,从而为拐枣枝多糖的合理开发和应用提供理论依据。以拐枣枝为试验材料,在单因素试验基础上,采用响应面分析法优化拐枣枝多糖提取工艺;通过拐枣枝多糖对羟自由基（·OH）、ABTS自由基（ABTS+·）和DPPH自由基（DPPH·）的清除率的测定从而评价拐枣枝多糖的抗氧化性。结果表明：最佳多糖的最佳提取条件为料液比1∶30（g∶mL）、浸提温度80 ℃、浸提时间2.0 h,拐枣枝多糖的提取率为2.44%。抗氧化性结果表明,拐枣枝多糖对·OH、DPPH·和ABTS+·均有较强的清除作用,最大清除率分别达到76.2%、91.3%和96.8%。     

基于分布式电源的微电网智能保护控制终端设计

将分布式电源及微网接入大电网并网运行,与大电网互为支撑,是发挥分布式电源和微网效能的有效方式,对改变我国能源结构、节能减排具有重要作用。在研究微网和大电网相互影响和保护控制必须协调处理的基础上,设计了双处理器平台下的微网智能保护控制终端,并利用微网多点电气信息构建全网数据共享,实现了微网区域控制和本地元件保护的相互协调及微网并网与离网之间的平滑过渡,能灵活适应微网并网或孤岛的运行模式。该设计终端在某微网示范工程中已得到应用,行之有效。     

Li-doping stabilized P2-Li0.2Na1.0Mn0.8O2 sodium ion cathode with oxygen redox activity

The discovery of the oxygen chemistry phenomenon reveals bright future toward new sustainable layered Na-based transitional oxides. However, the poor capacity retention problem of the cathode has hindered the development of sodium ion batteries (SIBs). In this work, a new Li-doped compound Li_0.2Na_1.0Mn_0.8O₂ is proposed, which demonstrates refined cycling durability with 51.6% after 100 cycles at 50 mA g⁻¹, superior than Na_1.2Mn_0.8O₂ with only one cycle. Then in situ X-ray diffraction (XRD) and density function theory (DFT) are employed to explore the lattice distortion and confirm stable lattice framework introduced by Li atoms with eliminated P2-O2 phase transition upon cycling, guaranteeing outstanding electrochemically stable performance. In addition, Li_0.2Na_1.0Mn_0.8O₂ demonstrates activation of Mn as well as O chemistry redox in the lattice, detected by ex situ electronic paramagnetic resonance spectroscopy (EPR) as well as in situ Raman, which indicate not only Na-deficient Mn-based layered oxide but also Na-rich Mn-based compound can represent oxygen redox.     

基于支持向量机的配电设备温度监测数据预测

环网柜是环网供电的关键设备,但在长期运行过程中,其温度会因多种因素的影响而升高,从而降低设备的供电安全及可靠性。提出了一种环网柜电气接头温度值的预测方法,分析环网柜电气接头的实测温度值,并使用小波去噪去除所测温度数据中的系统噪声;利用最小二乘支持向量机,预测数据的变化趋势。将该模型应用于环网柜的温度预测中,实验结果验证了该模型的有效性。     

A Communication Method between High-speed UUV and Distributed Intelligent Nodes

Mobile Networks and Applications - In this paper, a doppler distortion compensation method for underwater transmission of OFDM (Orthogonal Frequency Division Multiplexing) signals is proposed,...     

Large-scale electrochemical fabrication of nitrogen-doped carbon quantum dots and their application as corrosion inhibitor for copper

Journal of Materials Science - A novel micro-zone electrochemical exfoliation method for the large-scale fabrication of nitrogen-doped carbon quantum dots (N–CQDs) from pre-baked carbon anode...     

Adaptive Sampled-Data Observer Design for a Class of Nonlinear Systems with Unknown Hysteresis

Neural Processing Letters - In this paper, a novel adaptive sampled-data observer design is studied for a class of nonlinear systems with unknown Prandtl–Ishlinskii hysteresis and unknown...     

一种面向Deep Web集成服务的查询结果动态排序方法

Deep Web集成服务的快速发展,方便了用户对Deep Web信息检索需求。如何提高查询结果的排序效果,将最接近用户查询的结果显示给用户,逐渐成为研究重点。提出了一种综合评判方法,从数据源质量、查询相关度以及查询响应反馈三个方面,综合计算出查询结果的评价分值,并用于查询结果排序,具有较好的可行性和有效性。