计及UPFC的主动配电网日前-实时优化策略

针对统一潮流控制器使优化策略模型非线性化,实时阶段计及模型时序耦合特性增加了智能算法求解维度,不利于优化的问题,提出了日前-实时优化策略。日前优化为不考虑统一潮流控制器的线性模型,确定实时优化的微型燃气轮机调节幅度上、下限,以保证模型收敛;针对统一潮流控制器使网损下降及新能源出力、负荷预测偏差,在实时阶段调整日前优化策略,通过消除时序耦合实现计及统一潮流控制器的单时段优化以降低求解维度。最后,通过算例分析验证了所提模型的有效性。     

基于智能负荷控制的分布式能源系统调控策略研究

为提高分布式能源系统（DES）经济性及运行效率,提出基于智能负荷控制的DES调控策略。首先,基于智能电表的测量数据,采用监督学习技术训练神经网络,构建智能负荷神经网络模型计算住宅可控有功功率;其次,考虑智能负荷与DES之间的互动关系,结合DES各设备运行及互补特性,构建智能分布式能源管理系统模型,分析其可控负荷的调度策略,并给出求解流程,利用IEEE-6节点系统进行算例分析。结果表明,DES总运行成本将随着需求响应控制的加强而降低,考虑智能负荷参与能源系统互动,可有效改善系统负荷曲线,减少切负荷现象,促进风电、光伏清洁能源的消纳。     

温循条件下电源模块的瞬态热力耦合研究及优化

针对电源模块在温度循环条件下工作的可靠性问题,以典型电源模块为研究对象,基于有限元分析软件建立温循条件下电源模块的瞬态温度分布模型和电源模块的瞬态热力耦合模型,着重分析芯片、玻璃绝缘子等易损区域。在此基础上以玻璃绝缘子的最大热应力和芯片的最高温度为优化目标,对电源模块进行遗传算法优化设计。结果表明,相比其他研究直接施加热载荷条件,采用瞬态热力耦合所得电源模块结果更准确,芯片温度为86.03℃,玻璃绝缘子的热应力为61.27 MPa。经过遗传算法优化的芯片温度为81.85℃,玻璃绝缘子的热应力为37.05 MPa,满足可靠性要求。证明遗传算法与仿真结合,可有效提高产品设计的可靠性。     

基于偏振调节的太赫兹量子级联激光器双光梳研究

太赫兹量子级联激光器（THz QCL）双光梳在光谱检测、测距、成像等领域具有重要应用。双光梳信号严重依赖THz耦合光功率。利用THz QCL激射光为线偏振光的特性,在双光梳光路上插入线偏振片,通过旋转偏振片以达到对THz光强进行调节的作用。系统研究了THz QCL双光梳谱和功率与偏振角度的依赖关系,为实现高稳定THz双光梳光源与应用奠定基础。     

溅射法制备n型碲化镉薄膜的光电化学特性研究

采用溅射法制备了n型碲化镉薄膜。研究了不同沉积时间制备的n型碲化镉薄膜的形貌、结构和光学性质,以及薄膜厚度和退火工艺对n型碲化镉薄膜光电化学特性的影响。实验结果表明,溅射时间为25 min的碲化镉薄膜具有较好的PEC性能。退火工艺可以提高沉积的n型碲化镉薄膜的光电化学性能。当用饱和氯化镉溶液涂覆碲化镉薄膜并在真空中400 ℃退火时,n型碲化镉薄膜的光电化学性能最佳,光电流达到301 μA/cm²。     

InPBi薄膜材料的结构性能和光学性能研究

室温下,InPBi表现出强而宽的光致发光光谱,其宽光谱特性来自于材料中的PIn反位深能级和与Bi相关的深能级。该特性使得InPBi有希望应用于制备光学相干层析扫描系统中的超辐射光源。文章利用透射电子显微镜和三维原子探针研究了InPBi薄膜材料的结构性能,发现Bi原子在InPBi薄膜中的分布极不均匀,在InPBi/InP界面出现了Bi的富集区,从该区域沿[001]方向出现了Bi的纳米面,此纳米面位于(110)平面上。这种Bi原子的富集分布阻碍了PIn反位参与的载流子复合过程,对InPBi的光学性能有显著的影响。研究结果可为制造光学相干层析扫描系统的超辐射发光二极管提供一定的理论基础。     

原子层沉积低温生长α-MoO3薄膜

以六羰基钼和氧气为前驱体,通过等离子增强原子层沉积技术（PE-ALD）在硅基片上实现了α-MoO₃薄膜的低温制备。利用X射线衍射仪、扫描电子显微镜、原子力显微镜、X射线光电子能谱仪等手段对薄膜的晶体结构、表面形貌及薄膜成分进行表征和分析。研究发现衬底温度和氧源脉冲时间对MoO₃薄膜的晶体结构和表面形貌变化起关键作用。当衬底温度为170℃及以上时所制备的薄膜为α-MoO₃;适当延长ALD单循环中的氧源脉冲时间有利于低温沉积沿（0k0）高度择优取向的MoO₃薄膜。根据对不同厚度MoO₃薄膜表面的原子力显微图片分析,MoO₃薄膜为岛状生长模式。     

Crack width estimate in reinforced concrete with FBG sensor:experimental and numerical analysis

A detecting method of investigating the function of crack width versus fiber Bragg grating (FBG) spectrum deformation was proposed. In this paper, the bond-slip model of deformed steel bar in concrete slab was used to calculate the crack width. The stress distributions along optic-fiber grating were extracted by the three-dimensional (3D) finite element method (FEM) and the spectrum deformation of FBG induced by the uneven distribution of the stress was calculated. Experiments were carried out with an FBG fixed on the bottom of concrete slab. The crack width and FBG spectrum deformation of experimental results were given, and the function of crack width versus wavelength shift of FBG sensor was given also. The proposed technology in this paper could improve the safety of large-scale concrete building by early identification of structural crack.     

Upconversion fluorescence modulation of CaTiO3:Yb3+/ Er3+ nanocubes via Zn2+ introduction

rials, CaTiO3:Yb3+/Er3+/Zn2+ nanocubes with uniform size were prepared by solvothermal method in this paper. They were respectively characterized by X-ray diffractometer (XRD), scanning electron microscope (SEM), photoluminescence (PL) spectroscopy and their fluorescence lifetimes. The results show that the average size of the nanocubes is about 550 nm×650 nm×850 nm with good upconversion luminescence (UCL) properties. Under 980 nm laser excitation, the effects of the ratio between activator Er3+ and sensitizer Yb3+ and Zn2+ doping on the upconversion fluorescence properties were investigated, and the optimal ion ratio was obtained. The results of steady-state spectra show that the strongest fluorescence intensity of CaTiO3:Yb3+/Er3+ was obtained with the addition of 10 mol% Zn2+ at a Yb3+/Er3+ molar doping ratio of 3:0.3, which was attributed to the crystal field asymmetry generated by the introduction of Zn2+ ions. The energy transfer and upconversion mechanism between Yb3+ and Er3+ ions in CaTiO3 nanocubes were investigated by analyzing the upconversion fluorescence kinetics.