真——作文之本

作者认为,真是做人之本,也是作文之本,因此,教师在作文教学时要鼓励学生说真话,写他所想,说他想说,将心中对生活的真情实感通过文字表现出来。     

论红色文化教育的社会价值

红色文化教育的社会价值,总的来说是指具有促进社会全面进步和健康发展的价值。具体包括政治价值、经济价值、文化价值、管理价值、生态价值等五方面价值。政治价值表现为传播政治意识、引导政治行为、和谐政治关系等作用;经济价值表现为保证经济发展的方向、提供经济发展的精神动力和营造经济进步的良好环境;文化价值表现为促进主流文化的丰富和发展;管理价值表现为丰富现代管理的人文取向,落实以人为本的管理原则;生态价值表现为帮助人们树立生态道德观和可持续发展观,发挥促进社会可持续发展的作用。     

Hierarchical NiCo LDH–rGO/Ni Foam Composite as Electrode Material for High-Performance Supercapacitors

In this study, a bulk composite material symbolized as NiCo LDH-rGO/Ni F was developed by a solvothermal process for the first time. This material was fabricated through simultaneous growth of nickel-cobalt layered double hydroxide(NiCo LDH) and reduced graphene oxide(rGO) on nickel foam. This bulk composite can be used directly as a binder-free electrode for supercapacitors(SCs). The physicochemical properties of this composite were characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy. The electrochemical properties of the composite were measured by the cyclic voltammetry and galvanostatic charge-discharge. The results show that this composite had a hierarchical structure and exhibited a significantly enhanced specific capacitance of up to 3383 F/g at 1 A/g. The asymmetric SC using this composite as a positive electrode had a high energy density of 40.54 Wh/kg at the power density of 206.5 W/kg and good cycling stability. Owing to the synergies between the metal oxides and the rGO, the preparation method of in situ growth and its hierarchical structure, this bulk composite displayed excellent electrochemical performance and had a promising application as an efficient electrode for high-performance SCs.