基于风场AGC调度控制的三区域控制法

针对电网调度中心对风场的自动功率调度目标要求,在分析MW级双馈变桨风机机组运行特性的基础上,采用传统的PID控制为基础、结合控制保护区域检测单元、机组控制输出保护单元组合的三区域控制系统建立的风场有功控制单元,针对莱州风电场进行AGC控制测试,证明三区域控制系统具有良好的系统控制性能。     

铸态30CrMnSiNi2A钢的热变形行为与热加工图

目的 研究铸态30CrMnSiNi2A钢的热变形行为,并建立热加工图评估出合适的热变形参数。方法 在变形温度900~1 200 ℃和应变速率0.01~10 s⁻¹条件下开展热压缩实验,分别构建应变0.2、0.4、0.6、0.8下的热加工图,结合扫描电镜对变形后的微观组织进行分析。结果 30CrMnSiNi2A钢在压缩过程中真应力的变化是加工硬化和动态软化协同作用的结果;在低应变速率时(0.01、0.1 s⁻¹),流动曲线在应力值达到峰值应力(σp)后都表现出流动软化现象,而在高应变速率下流动曲线则表现出连续的加工硬化现象。结论 根据变形试样的微观组织和塑性流动是否稳定,可将热加工图分为3个区:流动失稳区、不完全动态再结晶区、完全动态再结晶区,在完全动态再结晶区内的晶粒细小均匀,所以将变形温度1 100~1 180 ℃、应变速率0.01~0.5 s⁻¹确定为适合于30CrMnSiNi2A钢的加工窗口。     

泡沫金属复合材料的研究进展EI北大核心CSCD

泡沫金属复合材料是一种轻质复合材料,具有低密度、高强度、高屏蔽性能、高阻尼性能等特性,其在航空航天、钻井隔水管浮筒、人工骨等多个领域具有广泛的应用前景,备受人们关注。本文通过对现有文献的研究,介绍了泡沫金属复合材料的制备方法,深入分析泡沫金属复合材料的显微结构对其性能的影响,综述了材料的力学性能、阻尼性能、屏蔽性能、隔热等性能和机制的进展以及其在相关领域的应用,为未来泡沫金属复合材料的开发提供一定的理论依据,并对其新制备工艺、建模研究、夹芯结构以及高性能泡沫空心球的制备等研究方向进行展望。     

Surfactant effect on DLP fabrication of silica fibre preforms

Three-dimensional (3D) printing based on digital light processing (DLP), for its great advantage in dealing with material and structural complexities, is being engaged for the fabrication of custom-designed silica optical fibre preforms. Resin preparation and printing are key processes critical to DLP fabrication of optical fibre preforms with high silica loading. In this work, the surfactant effect on preparation of resin and DLP printing of optical fibre preforms for higher silica loading is investigated. Based on our experimental studies of the rheological and photocuring properties of resins and the quality of printed silica fibre preforms, we find that, in the case where 2-phenoxyethanol (POE) is usually added as the surfactant, the resin has higher viscosity and results in poorer preform quality. By removing POE from resin ingredients and designing a multi-step resin processing with appropriate settling and degassing processes, fibre preforms with high silica loading up to 0.8 (w/w) have been successfully fabricated.     

Non-Cardiotoxic Tetradecanoic Acid-2,4-Dinitrophenol Ester Nanomicelles in Microneedles Exert Potent Anti-Obesity Effect by Regulating Adipocyte Browning and Lipogenesis

Sustained oral uncoupler 2,4-dinitrophenol (DNP) administration exerts prominent anti-obesity effects, but the adipose tissue off-target disadvantage leads to systemic adverse effects. A novel non-cardiotoxicity DNP delivery method using a biocompatible microneedles patch containing the amphiphilic tetradecanoic acid-DNP ester (TADNP) is described, which is synthesized via esterification on the phenolic hydroxyl of DNP. The TADNP is self-assembled as nanomicelles, which enhance the endocytosis rate of DNP by adipocytes and its permeation in isolated adipose tissues. The microenvironment of adipose tissues promotes the massive release of DNP and plasma and simulated gastrointestinal fluids. The microneedles-delivered TADNP nanomicelles (MN-TADNP) effectively deliver DNP in treated adipose tissues and reduce DNP content in off-target organs. Both oral and MN patch-delivered TADNP micelles effectively exert anti-obesity effects in a mouse model of high-fat diet-induced obesity; and noteworthily, MN-TADNP exhibit more satisfactory biosafety than oral administration. Here, a smart MN patch loaded with tetradecanoic acid-modified DNP is reported, which enhances its accumulation in adipose tissues and exerts an anti-obesity effect without causing any systemic toxicity.     

动态高压微射流环境中豌豆白蛋白-绿原酸复合物的相互作用

通过对豌豆白蛋白以及豌豆白蛋白-绿原酸复合物粒度、Zeta电位、荧光光谱、红外光谱与疏水性、溶解性、乳化特性等指标的测定，探究动态高压微射流不同处理压力对豌豆白蛋白和复合物结构与功能特性的影响，以及二元体系中绿原酸对豌豆白蛋白影响的机制和效果。结果表明，豌豆白蛋白经过动态高压微射流处理后，粒径与Zeta电位值均呈先降低后增加趋势；改性后的豌豆白蛋白微观结构、二级结构与三级结构均发生变化；剪切力等作用的小粒径豌豆白蛋白溶解性显著提高了42.37%，可达到0.84 mg/mL(P<0.05)，乳化特性也得到一定增强。动态高压微射流处理加工豌豆白蛋白-绿原酸复合物体系中，绿原酸改变了豌豆白蛋白色氨酸的微环境，使白蛋白结构发生显著变化。绿原酸使豌豆白蛋白表面疏水性显著增加（P<0.05），溶解性显著降低（P<0.05），并将豌豆白蛋白乳化活性提高。本研究阐释了动态高压微射流和绿原酸对豌豆白蛋白的影响作用，为豌豆白蛋白改性提供思路，为高值化蛋白产品的开发提供一定理论基础。     

Intelligent identification of metal corrosion based on Corrosion-YOLOv5s

Metal materials corrosion is one of the most common forms of damage to metal facilities. Exposed to air, especially in humid and high-salt coastal areas, metal facilities are vulnerable to corrosion, which may cause huge economic losses and even lead to serious accidents. In order to identify and classify the metal corrosion of public facilities quickly and accurately, a metal surface corrosion identification model frame Corrosion-YOLOv5s was present based on the YOLOv5s model in this paper. The Corrosion-YOLOv5s model extended the identification scale of the YOLOv5s to better accommodate the multi-scale variation of metal corrosion areas. The feature fusion network of the YOLOv5s model was improved to enhance the feature fusion capability of the model for the target. The C3 module in the YOLOv5s feature fusion network was improved, and the C3CA module was designed by combining the coordination attention mechanism. In addition, a new metal corrosion images dataset was created for the metal corrosion identification study. Extensive experiments were conducted, and excellent results were achieved with precision, recall, F₁-score, and mAP of 90.2%, 90.8%, 90.5%, and 95.5% for the Corrosion-YOLOv5s model, respectively.     

Electroextraction of neodymium from LiCl-KCl melt using binary liquid Ga-Al cathode

The electrochemical behaviour of Nd(Ⅲ) ion was investigated on inert W,active Ga and Ga-AI cathodes.It is established that the reduction of Nd(Ⅲ) ion on the inert electrode is a consecutive two-step process while that on the active electrodes is a one-step process.The apparent standard potential of the Nd(Ⅲ)/Nd redox couple at different temperatures was determined by open-circuit chronopotentiometry and semi-differential method,and the relationship between temperature and apparent standard poten...