基于AIE特性的萘酰亚胺衍生物的合成及光谱研究

以分子内电荷转移为原理,选用萘酰亚胺为荧光团,与三苯胺通过偶联反应,制备了一种萘酰亚胺衍生物有机光功能小分子材料,其合成路线简单,实验操作条件易控,成品产率较高。对其光学性能进行研究,在不同溶剂中的光学性能主要表现出两个强吸收带,荧光发射达到到近红外区域,其表现出了非常明显的聚集诱导发光（AIE）特性,固体表现出很强的橘橙色荧光现象。     

统一电能质量调节器的Simulink仿真分析

介绍了统一电能质量调节器的结构原理,指出了其相对于传统有源电力滤波器的优势.采用dq0谐波检测法作为UPQC的检测方法,采用SVPWM控制法、滞环比较控制法分别作为UPQC串联侧、并联侧的控制方法,并在Simulink软件平台上对电压电流的检测及控制方法进行仿真实验.仿真结果表明了其检测和控制方法的正确性和有效性.     

Chemical Solution Deposition of Columnar-Grained Metallic Lanthanum Nitrate Thin Films

Columnar and (100)-oriented LaNiO₃ thin films were prepared on silicon substrates by a chemical solution deposition (CSD) process using a 0.05 M solution. By reducing the individual layer thickness to 10 nm, columnar LaNiO₃ films with a lateral grain size of ∼120 nm were obtained. The success of this approach required restricting the individual layer thickness to a value below the grain size observed for equiaxed films. This change in microstructure resulted in an improvement in conductivity. The columnar LaNiO₃ film with a thickness of 300 nm showed a resistivity of 4.5 × 10⁻⁵Ω·cm, which is lower by one order of magnitude than that of fine-grain equiaxed films that typically result from CSD methods.     

AVC系统晶闸管与SF6开关电容投切技术研究

随着AVC系统的投运,变电站内电容器投切更加频繁。传统补偿电容器的SF6开关投切频率低,难以满足投切间隙中出现的无功补偿需求,限制了电容器的作用。为了解决上述问题,文中提出了一种复合开关结构。该结构将机械投切和电子开关投切相结合,构成晶闸管+SF6开关的组合式投切方案。文中对晶闸管+SF6开关投切电容器的工作原理进行了介绍,并分析了开关控制策略。通过合理的投切策略可以实现晶闸管和SF6开关的相互保护,使晶闸管阻断时避免承受高电压,也避免了SF6开关在高频投切的情况下频繁动作,延长设备使用寿命。最后,通过PSIM软件仿真验证了该复合开关的合理性和可行性。     

新疆和什托洛盖矿区侏罗系含水复合超软岩治理

为解决新疆和什托洛盖矿区侏罗系含水复合超软岩稳定性控制难题,通过现场实测、理论分析和室内测试等综合实验手段对该矿区围岩稳定性进行分析,以沙吉海煤矿+550 m水平井底车场为例,利用恒阻大变形锚杆（索）耦合支护体系为核心,积极探索软岩治理的新途径,新方法,取得了显著成果,可为后续矿井建设和围岩治理提供可靠借鉴。     

固相反应法制备MgAl2O4纳米粉体及其烧结行为研究

在800℃下煅烧Al(OH)3和MgSO4混合粉末,冷却后经过水洗得到了结晶良好的MgAl2O4纳米粉体.采用DSC/TG、XRD、TEM和SEM等分析手段研究了混合粉末中Mg/Al原子比对颗粒尺寸及团聚状况的影响,以及MgAl2O4纳米粉体的烧结性能.所制备的MgAl2O4纳米粉体平均颗粒尺寸为12 nm,尺寸分布窄,团聚少.MgAl2O4的生成归因于γ-Al2O3和MgSO4的固相反应.MgAl2O4纳米粉体显示了良好的烧结活性,在1450℃烧结1 h即能获得相对密度为95%的MgAl2O4陶瓷.     

网络环境下动态分布内容的自组织语义整合框架

随着网络和多媒体技术的发展,新型网络技术不断出现,并通过互联网络不断融合,使得网络更加泛在化、开放和动态化.目前,网络中动态分布的内容爆炸式增长与用户个性化需求之间的矛盾也日益突出.因此,基于开放的网络环境下海量的内容,如何提供个性化、智能的内容服务,已成为研究界和工业界共同关注的问题.基于开放、动态的网络环境,以个性化的语义整合服务为核心目标,将语义技术与网络通信机制相结合,提出了动态分布内容自组织语义整合的网络结构和关键技术的实现机制,包括关系路由模型、自组织语义整合技术框架和实现流程,以支持在网络环境下针对动态分布的内容构建个性化和智能的语义整合应用,并且为动态分布内容的语义整合系统提供工程设计方案和技术实现方法.     

Context-aware end-to-end QoS diagnosis and quantitative guarantee based on Bayesian network

To support quality of service(QoS)management on current Internet working with best effort, we bring forth a systematic approach for end-to-end QoS diagnosis and quantitative guarantee. For QoS diagnosis, we take contexts of a service into consideration in a comprehensive way that is realized by exploiting causal relationships between a QoS metric and its contexts with the help of Bayesian network(BN)structure learning. Context discretization algorithm and node ordering algorithm are proposed to facilitate BN structure learning. The QoS metric is diagnosed to be causally related to its causal contexts, and the QoS metric can be quantitatively guaranteed by its causal contexts. For quantitative QoS guarantee, those causal relationships are first modeled quantitatively by BN parameter learning. Then, the QoS metric is guaranteed to certain value with a probability given its causal contexts tuned to suitable values, that is, quantitative QoS guarantee is reached. Simulations with three sequential stages:context discretization, QoS diagnosis and quantitative QoS guarantee, on a peer-to-peer(P2P)network, are discussed and our approach is validated to be effective.     

Effects of Individual Layer Thickness on the Structure and Electrical Properties of Sol–Gel-Derived Ba0.8Sr0.2TiO3 Thin Films

Ba_0.8Sr_0.2TiO₃ thin films were prepared with various individual layer thicknesses using a sol–gel process. The individual layer thickness strongly affected the structure, ferroelectricity, and dielectric properties of the films. The films prepared with an individual layer thickness of 60 nm showed small equiaxed grains, cubic structure, temperature-independent dielectric constant, and no ferroelectricity. The films prepared with an individual layer thickness of 8 nm showed columnar grains, tetragonal structure, good ferroelectricity, and two dielectric peaks in the dielectric constant–temperature curve. The individual layer thickness for layer-by-layer homoepitaxy growth that resulted in columnar grains was <20 nm.     

三相光伏并网控制系统的仿真研究

通过仿真实验,分析与研究了三相光伏并网发电系统的控制策略.首先建立了太阳能电池的数学模型,采用基于干扰观测算法进行最大功率点跟踪;然后介绍了三相光伏并网发电系统的结构,并采用空间矢量SVPWM控制器对逆变器进行并网控制;最后在Matlab/Simulink软件上进行了仿真实验.结果表明,SVPWM逆变控制策略优于传统的滞环电流逆变控制策略.