Ultrathin Mesoporous NiCo2O4 Nanosheets Supported on Ni Foam as Advanced Electrodes for Supercapacitors

A facile two‐step method is developed for large‐scale growth of ultrathin mesoporous nickel cobaltite (NiCo₂O₄) nanosheets on conductive nickel foam with robust adhesion as a high‐performance electrode for electrochemical capacitors. The synthesis involves the co‐electrodeposition of a bimetallic (Ni, Co) hydroxide precursor on a Ni foam support and subsequent thermal transformation to spinel mesoporous NiCo₂O₄. The as‐prepared ultrathin NiCo₂O₄ nanosheets with the thickness of a few nanometers possess many interparticle mesopores with a size range from 2 to 5 nm. The nickel foam supported ultrathin mesoporous NiCo₂O₄ nanosheets promise fast electron and ion transport, large electroactive surface area, and excellent structural stability. As a result, superior pseudocapacitive performance is achieved with an ultrahigh specific capacitance of 1450 F g^?1, even at a very high current density of 20 A g^?1, and excellent cycling performance at high rates, suggesting its promising application as an efficient electrode for electrochemical capacitors.     

锂离子电池铁基二元复合金属氧化物负极材料研究进展

铁基二元复合金属氧化物(MFe2O4,M=Zn,Co,Ni……)是一种极具应用前景的新型锂离子电池负极材料,具有价格低廉、无毒、理论比容量高,环境友好等优点。本文对Zn Fe2O4、Co Fe2O4、Ni Fe2O4等铁基二元复合金属氧化物锂离子电池负极材料的制备方法、微结构和电化学储锂性能的研究现状进行了综述,针对其实际应用中所存在的主要问题,提出了相应的改善方法和应对策略,并展望了其广阔的应用前景。     

高炉炉顶液压故障的判断及处理方法

该文主要介绍PAUL WURTH串罐式的高炉炉顶液压系统的一系列常见液压故障现象及判断、处理方法,并从实际出发,提供一些出现过的常见案例进行分析,通过案例中的处理方法来分析,以达到提高维修人员的处理故障能力。     

Optically transparent broadband water antenna

In this article, we investigate an optically transparent broadband water antenna, which is composed of a cross‐shaped slot feeding structure and a thin layer of water supported by a transparent dielectric slab. This water antenna can be analyzed as an embedded stacked dielectric resonator (DR) antenna (DRA) mounted on a ground plane. Two distinct resonator modes—namely, DRA mode and dielectric‐loaded slot (DLS) mode—are excited to achieve a good impendence matching over a very wide frequency range. A prototype antenna is designed, fabricated, and measured. Measured results demonstrate that the designed water antenna exhibits a broad impedance bandwidth of about 37% from 1.07 to 1.56 GHz with antenna efficiency better than 65% and broadside radiation characteristics with low cross‐polarizations.     

Effect of periodic number of [Si/Sb80Te20]x multilayer film on its laser-induced crystallization studied by coherent phonon spectroscopy

The periodic number dependence of the femtosecond laser-induced crystallization threshold of [Si(5nm)/Sb₈₀Te₂₀(5nm)]_x nanocomposite multilayer films has been investigated by coherent phonon spectroscopy. Coherent optical phonon spectra show that femtosecond laser-irradiated crystallization threshold of the multilayer films relies obviously on the periodic number of the multilayer films and decreases with the increasing periodic number. The mechanism of the periodic number dependence is also studied. Possible mechanisms of reflectivity and thermal conductivity losses as well as the effect of the glass substrate are ruled out, while the remaining superlattice structure effect is ascribed to be responsible for the periodic number dependence. The sheet resistance of multilayer films versus a lattice temperature is measured and shows a similar periodic number dependence with one of the laser irradiation crystallization power threshold. In addition, the periodic number dependence of the crystallization temperature can be fitted well with an experiential formula obtained by considering coupling exchange interactions between adjacent layers in a superlattice. Those results provide us with the evidence to support our viewpoint. Our results show that the periodic number of multilayer films may become another controllable parameter in the design and parameter optimization of multilayer phase change films.     

棉印染行业污水处理及回用技术现状分析

针对目前棉印染行业污水处理回用技术的剖析,得出值得推广应用的,清浊分流分质处理法＋深度过滤软化处理法;清浊分流分质处理法＋深度过滤软化处理法＋反渗透部分脱盐法;并指明综合污水处理法＋全膜法脱盐,能满足所有用水要求,是未来发展的方向。     

连铸和热轧浊环水处理系统的短流程设计探讨

采用化学除油沉淀器或改进后的旋流沉淀池和新型的机械除油机以及转动自清洗污泥脱水装置，可将传统的浊环水处理长流程变为清洁生产的短流程。     

纳米CeO2磨料对硅晶片CMP的效果与机理研究

通过均相沉淀法制备了纳米CeO_2超细粉体,并配制成抛光液对硅片进行化学机械抛光(CMP),研究了纳米CeO_2磨料对硅片的抛光效果,通过建立的接触模型进一步地解释了纳米级磨料的化学机械抛光机理。实验结果分析表明:由于纳米磨料粒径小,切削深度小,材料是以塑性流动的方式去除。使用纳米CeO_2磨料最终在1μm的范围内达到了微观表面粗糙度Ra为0.103 nm的超光滑表面,而且表面的微观起伏更趋向于平缓。     

某工业设备间通风方案的数值模拟与优化

合理的气流组织,有利于改善室内通风效果。利用CFD技术,对某设备间的四种通风方案进行了数值模拟与分析,得出了四种方案在水平和垂直方向上的温度分布规律,并以工作区平均温度作为评价指标,比较了四种方案的通风效果。研究结果表明,采用下送上排的气流组织形式,可以降低工作区平均温度1.3℃,取得更好的通风效果。其研究结果,可供相关工业建筑通风设计参考。     

基于智能多代理者的故障诊断系统

智能多代理者系统(MAS)为电子设备的故障定位和诊断提供了一种新的分析和求解思路。本文展示了应用MAS体系结构设计和实现的智能故障诊断系统——MDIDS。文章首先介绍MDIDS系统的数据结构——分为三个层次的代理者群体,给出了系统中代理者的知识表示。然后说明MDIDS使用的诊断推理算法,并提出了一种新的基于估价函数的故障状态空间搜索算法。该算法能够实现对复杂电路的快速故障定位。文章最后总结了MDIDS系统的特点和将来的工作。