高品质BiOCl珠光颜料的制备及其在水性珠光印花涂料中的应用

为解决合成高固含量氯氧化铋(BiOCl)晶体时易产生晶体碎片和团聚的问题，以聚乙二醇单甲醚-b-聚甲基丙烯酸N,N-二甲基氨基乙酯为分散剂，制备了高固含量(10%)、分散性优异的正方形Bi OCl晶体。以其为珠光颜料，自制的水性聚氨酯(WPU)乳液作黏合剂，制得了具有不同层次珠光效果的织物珠光印花涂层。用光学显微镜、激光粒度仪和XRD考察了BiOCl晶体的形貌、粒径分布和结晶度，并考察了珠光印花涂层的透气性、透湿性、水接触角及色牢度。结果表明，Bi OCl晶体的尺寸可控、无碎片和团聚、结晶度较高；珠光印花涂层透湿率>5500 g/(m²·d)，透气率在15～24 mm/s之间，水接触角>130°，耐洗和耐摩擦色牢度达到4级及以上。     

Actuator fault detection for masonry robot manipulator arm with the interval observer

The main construction method of building wall is artificial masonry, the main problem is that the process is associated with low construction efficiency and poor safety, workers are prone fall from high altitude. The research of automatic masonry robot has become an urgent need. The masonry mechanical arm system is the main executing part of the masonry robot, special attention should be paid to the robot fault. Therefore, it is necessary to establish a suitable model to detect the actuator faults of the manipulator system. In this paper, a dynamic model of manipulator fault is presented and a fault detection scheme of masonry robot manipulator arm is proposed based on the model. The model is simplified by analyzing the state parameters of each joint during robot masonry and the interval observer with more design freedom was designed based on the established mathematical model of actuator faults. In this paper, a joint method for solving S and L matrices is proposed, which avoids the limitation of the traditional method for solving L matrices by two-step. In the presence of external interference, $l_1$/$H_{\infty }$ performance are introduced into the generation process of residual interval, and the interval observer has better disturbance robustness and fault sensitivity. Simulation experiments verify that the scheme can effectively detect the actuator fault of the manipulator, and experiments are carried out on a 6-axis manipulator. The experimental results show that when actuator faults occur at joints 2 and 3, the residual rapidly exceeds the threshold range, which proves the effectiveness of the fault detection scheme designed in this paper.     

Glutamine Induced High-Quality Perovskite Film to Improve the Efficiency of NIR Perovskite Light-Emitting Diodes

Formamidine lead iodide (FAPbI₃) is an important material for realizing high-performance near-infrared light-emitting diodes (NIR-LEDs). However, due to the uncontrollable growth of solution-processed films which usually causes low coverage, and poor surface morphology, the development of FAPbI₃-based NIR-LEDs is hindered, restraining its potential industrial applications. In this work, by employing glutamine (Gln) in perovskite precursor, the quality of FAPbI₃ film is improved significantly. Due to the ameliorated solution process by the organic additive, the film coverage over the substrate is substantially enhanced. Meanwhile, the trap state of grain is largely reduced. Consequently, NIR perovskite LEDs are demonstrated with a maximum external quantum efficiency (EQE) of 15% with the emission peak at 795 nm, which is four times higher than the device with pristine perovskite film.     

Modification of Al2O3-based catalyst by rare earth elements for steam reforming of methane

Modification of rare earth elements (Ln) often contributes to the improved performance in many applications compared with the monometallic catalysts, but the current research is only limited in the individual light rare earth elements. In this work, a series of Ln elements involving Gd, Sm, Nd, Pr, and La was added into monometallic Ni/Al₂O₃ system to focus how the microstructure of active Ni centers depended on the presence and contents of Ln, and thus improved the catalytic behavior in the steam reforming of methane. Enhanced catalytic behavior could be observed over Ln-modified Ni catalysts, among which Ni-Gd/Al₂O₃ was predicted to be more high-efficient no matter supported on power or spherical Al₂O₃ catalysts. A combined investigation of XPS with STEM and TPR was carried out over the candidates to reveal the structure-performance relationship. Furthermore, this was further applied to noble metal systems, realizing the benign universality of the modification strategy.     

A low bulk density,low thermal conductivity permanent lining castable for tundish obtained by adding pearlescent sand

The precise control of molten steel temperature in tundish is a key factor to ensure the quality of the cast billets, so it is important to develop permanent lining castables for tundish with low thermal conductivity and bulk density. In this work, the hydrophobic modification of pearlescent sand was carried out with hydrogen silicone oil, and 3% of modified pearlescent sand was added to mullite-bauxite castable to realize its low thermal conductivity and light weight. It is found that modified pearlescent sand still has good hydrophobicity at 350°C, the addition of modified pearlescent sand effectively increases the apparent porosity and reduces the bulk density of the castable. At 1500°C, the bulk density of modified pearlescent sand-castable is 25.54% less than that of conventional castable. Compared with conventional castable, the mechanical properties and thermal shock resistance of modified pearlescent sand castable are worse, but they are sufficient to meet the use conditions of tundish permanent lining castable. At 600–1000°C, the thermal conductivity of the modified pearlescent sand castable is about 30% lower than that of the conventional castable, which proves that the addition of modified pearlescent sand can significantly improve the thermal insulation performance of mullite-bauxite castable.     

Neighboring Carboxylic Acid Boosts Peroxidase-Like Property of Metal-Phenolic Nano-Networks in Eradicating Streptococcus mutans Biofilms

Developing nature-inspired nanomaterials with enzymatic activity is essential in combating bacterial biofilms. Here, it is reported that incorporating the carboxylic acid in phenolic/Fe nano-networks can efficiently manipulate their peroxidase-like activity via the acidic microenvironment and neighboring effect of the carboxyl group. The optimal gallic acid/Fe (GA/Fe) nano-networks demonstrate highly enzymatic activity in catalyzing H₂O₂ into oxidative radicals, damaging the cell membrane and extracellular DNA in Streptococcus mutans biofilms. Theoretical calculation suggests that the neighboring carboxyl group can aid the H₂O₂ adsorption, free radical generation, and catalyst reactivation, resulting in superb catalytic efficiency. Further all-atom simulation suggests the peroxidation of lipids can increase the cell membrane fluidity and permeability. Also, GA/Fe nano-networks show great potential in inhibiting tooth decay and treating other biofilm-associated diseases without affecting the commensal oral flora. This strategy provides a facile and scale-up way to prepare the enzyme-like materials and manipulate their enzymatic activity for biomedical applications.     

基于平面投影的综合飞行引导算法研究

针对大圆航线在地球表面实现圆弧航段内引导飞行、两相邻航段间内切转弯飞行时的弧面几何计算误差大、过程复杂的问题，本文采用一种基于平面投影的引导算法，在进行高斯 -克吕格投影后的平面内进行引导解算，以实现圆弧航段引导飞行。本文在 VS2010 环境下实现了多航段内引导和航段间四种转弯方式引导飞行，搭建的仿真验证平台可通过预设航线，对基于平面投影的引导算法进行验证，仿真环境还具备常速飞行和按时到达等引导飞行能力。     

水下滑翔机声学测量系统的低功耗采集存储系统设计

用水下滑翔机进行海洋噪声测量是噪声测量的一种新手段,与以前的海洋调查船和潜标相比,它具有自动化程度高、效率高和成本低等优点.为了实现以水下滑翔机为平台的海洋噪声测量,开发了一种集主控、采集和存贮为一体的噪声测量软硬件系统.该测量系统采用了低功耗的采集存储系统.海上试验结果表明,所研制的噪声测量系统具有功耗低、存储方便等...     

电-氢-混氢天然气耦合的城市综合能源系统低碳优化调度

混氢天然气(HCNG)技术可有效解决大规模电制氢面临的纯氢运输成本高的问题。针对大规模风光消纳与城市综合能源系统(UIES)低碳优化调度问题，在源-网-荷-氢协同优化框架下，提出考虑电-氢-HCNG耦合与需求响应的UIES低碳优化调度方法。对电-氢-HCNG耦合单元运行特性进行建模，并引入用户单元需求响应机制，以系统运行成本最小为目标，建立UIES低碳优化调度模型。通过算例分析对所提模型进行验证，结果表明电-氢-HCNG耦合单元与用户单元需求响应机制的引入能够有效促进风光消纳，提高UIES低碳性。