Sodium titanate (Na 2 Ti 3 O 7 ) has been considered as a promising anode in sodium-ion batteries (SIBs) because of its low working voltage, high energy density and low cost. However, low electronic and ionic conductivity become the major obstacles to affect the improvement of its electrochemical performance.Here, based on the high specific surface area and high conductivity of reduced graphene oxides (rGO), a dense sandwich-like structure was built through a facile hydrothermal route. The Na 2 Ti 3 O 7 @rGO (NTO@rGO) composites have a stable two-dimensional conductive network framework and the Na 2 Ti 3 O 7 particles grow in situ on the surface of the rGO nanosheets, greatly improving the utilization of rGO by reducing the introduction of rGO. Moreover, when the NTO@rGO was used as an anode for SIBs, it showed an excellent cycle stability and rate performance with 137 mAh g À 1 at 100 mA g À 1 after 500 cycles and 92 mA g À 1 at 2 A g À 1 , respectively.

Academic stress and burnout are the predominant factors that can negatively affect student performance and sustainable learning. Therefore, it is important to analyze the factors related to student academic burnout in preservice teachers in western China. 212 respondents from public universities in Guangxi Province participated, and the data were analyzed using partial least-squares structural equation modeling (PLS-SEM) to check reliability, validity, and initial hypothesis testing. The results show that perfectionism, excessive self-efficacy, and workload are the main factors causing academic stress and burnout in preservice teachers. These problems can be reduced by increasing self-efficacy and coping strategies of preservice teachers. In addition, this study provides important knowledge to universities based on factors related to preservice teachers’ academic stress and burnout, as well as strategies and solutions to reduce these problems in students.

Understanding the concept is one aspect that is needed and must be owned by students in learning mathematics. This research aims to make learning media assisted by hawgent dynamic mathematics software on understanding the absolute value in grade 10 Senior high school to help teachers explain the concepts and assist students in finding and understanding the basic concepts of absolute value topic. The development model used in this research is ADDIE development model. ADDIE is an abridgment of Analyze, Design, Develop and Evaluation. Researchers the learning media Hawgent can help students to understand and find the concept of absolute value. Based on several aspects, clearly and attractively with an average of 78.9% in the excellent category. It is concluded that the development of learning media Hawgent dynamic mathematics software can be used on the subject of understanding the concept of absolute value and with the help of this software it can help teachers explain the concept of absolute value and the students are also very interested in this ICT-based learning media. This conclusion is related to the validation results of media experts and material experts, where the validation results from media experts on the use of learning media are in good categories.

<p><strong>Objective: </strong>To provide reference for the accurate clinical diagnosis and successful treatment by analyzing the clinical experience of pediatric acute intussusception. <strong>Methods: </strong>Retrospective analysis of 68 cases of pediatric acute intussusception in the hospital between January 2007 and December 2014. <strong>Results:</strong> For the 68 cases of pediatric acute intussusception, first diagnosis as acute intussusception in 49 cases (72.1%), first diagnosis as enteritis or bacillary dysentery in 16 cases (23.5%), 3 cases of unknown diagnosis (4.4%). All patients in 68 cases were treated for air enema reduction, of which 35 cases were successful (success rate is 51.5%), 33 cases were successful in operative reduction (success rate is 48.5%). <strong>Conclusion</strong>: Clinicians should improve the understanding of pediatric acute intussusception, diagnose as early as possible, take timely air enema or surgical reduction; the probability of success of air enema reduction and surgical reduction were both high; improve the life environment and hygiene situations, the enhancement of life quality to an extent can reduce the occurrence of pediatric acute intussusception.</p>