Search

The establishment of the territorial spatial planning system brings opportunities and challenges to the development of the discipline of territorial spatial planning, and puts forward new requirements for the teaching practice and talent training of the Territorial Spatial Planning course in universities in the Guangdong-Hong Kong-Macao Greater Bay Area(GBA). The Territorial Spatial Planning course is one of the significant major courses, such as human geography and urban and rural planning, physical geography and resources and environment, land resources management, geographical science, urban and rural planning. The teaching practice evaluation and analysis of Territorial Spatial planning course in GBA has important practical significance to improve the quality of talent training. On the basis of the context evaluation, input evaluation, process evaluation, product evaluation(CIPP) model, questionnaire survey, interview and literature collation were used to formulate the evaluation index system combined with the characteristics of the course. The analytic hierarchy process was used to calculate and compare the evaluation results of GBA: curriculum implementation is the core part of the teaching practice. The practicability of course content is the focus of the teaching. Under the new situation, colleges and universities should pay attention to the teaching idea of the course from the international perspective. [ABSTRACT FROM AUTHOR]

A series of Cu-doped layered P2-type Na0.67 Ni0.33-x CuxMn0.67O2 ( x = 0, 0. 05, 0. 10, 0. 15, 0. 20, 0. 25) with regular morphology and smooth surface were synthisized by sol-gel method. The morphology, structure and composition of those materials were characterized using SEM, XRD, EDS and XPS technologies, and their electrochemical properties were investigated by cyclic voltammetry and constant current charge-discharge methods through using them as cathode materials for sodium ion batteries. The optimum doping ratio was obtained. It is found that doping did not change the layered structure and morphology of the materials. Those materials exhibit good cycling stability and multiplicative performance due to the introduction of highly electrochemically active Cu2+ as a substituent and the increase of the surface active sodium storage sites. In the voltage range of 2. 0 V to 4. 3 V and a multiplicity of 0. 1 C, the initial discharge specific capacity of Na0.67Ni0.18Cu Ni0.15Mn Ni0.67O2(with Cu doped ratio of 0. 15) has an initial discharge specific capacity of 126. 74 mAh / g and a capacity retention rate of 79. 10% after 100 cycles, which is 50. 92% higher than that of the undoped material. The enhanced electrochemical properties of the material are attributed to the insertion of Cu2+ into the transition metal layer, and the radius of Cu2+(0. 73 Å) is larger than that of Ni2+(0. 69 Å), which widens the transition metal layer spacing and provides channels for Na+ diffusion, and in turn increases the Na+ diffusion rate. When charged to high voltage, the Na+ vacancy generation during Na+ de/embedding process is inhibited, thus the crystal structure of the material is stabilized, the P2-O2 phase transition is suppressed, and the cycling stability is improved. [ABSTRACT FROM AUTHOR]