Search

Digital educational resources serve as vital vehicles for the realization of educational digitization. The application of digital educational resources holds significant practical significance as it can enhance the quality and efficiency of education, improve teaching standards, and foster students’ proactive learning in the context of creating efficient classrooms. This paper employs a questionnaire survey approach to gain insights from the perspective of university students into the application of digital educational resources in university classroom teaching. Specifically, it delves into the current state of digital educational resource utilization, students’ usage preferences, diverse learning requirements, efficacy, satisfaction, and an analysis of issues encountered during their application. The aim is to offer fresh insights and decision-making references to boost the effective utilization of digital educational resources, promote student-driven learning, optimize the teaching process, and enhance teaching quality.

With the rapid rise of the Internet and social media, hot topics can often become hotspots of online public opinion. In order to explore the netizens’ views on hot topics, this paper constructs an LDA model to analyse the sentiment of the incident of travelling panda Yaya by crawling the Weibo comments on the incident of travelling Giant Panda Yaya in the U.S. The study shows that netizens suspect that Yaya has suffered some abuse in the U.S. Memphis Zoo, and urgently hope that the panda Yaya will come back to China as soon as possible to receive treatment and care in the domestic zoo. The results of the study are helpful for the relevant departments to understand the attitudes and tendencies of netizens towards hot topics in a timely manner, and quickly deduce the development trend of the topics, so as to guide the public opinion accordingly.

The development of precast concrete structure is an effective way to promote industrialization of construction industry and housing industrialization, and is also a inevitable choice for green development. Grouted splice sleeve connector, regarded as one of the key technologies of precast concrete structure, has the advantages of high strength and good seismic performance. In this paper, the development of grouted splice sleeve connector is systematically summarized both home and abroad, existing problems in the domestic research of sleeve are evaluated and analyzed, and corresponding countermeasures are also further proposed.

The singing bowl is used not only for the instrument of Buddhism but also for musical therapy. This work aims to investigate the correlation of vibration modes and percussion sound for singing bowls. A typical singing bowl is first selected to perform finite element analysis (FEA) for theoretical modal analysis (TMA) as well as experimental modal analysis (EMA). Modal parameters of singing bowl, including natural frequencies and mode shapes, can be obtained from analysis and experiment, respectively. Singing bowl FE model can then be updated and verified by adjusting material properties and used to predict structural vibration modes. The percussion sound of singing bowl is also measured to obtain its sound spectrum. The peak frequency response of singing bowl sound can be interpreted and contributed from circular vibration modes of the bowl. With the knowledge of sound generation mechanism for the singing bowl, this work also studies the percussion sound characteristics of seven different sizes of singing bowls. Results show the fundamental frequency and overtone frequencies of singing bowl percussion sound are higher for the smaller size. Interestingly, that the peak resonant frequencies have near the integer ratio relationship makes the singing bowl revealing harmony sound effects. The radiated sound spectrum can be well calibrated and predicted for different sizes of singing bowls. This work shows the analytical and experimental approaches in studying the singing bowl percussion sound that strongly correlated to structural vibration modes and can be adopted for future development of singing bowls.

According to the distribution network line structure and reclosing control strategy, the system simulation model of distribution network lines has established based on the real-time digital simulation RTDS. Based on this, distribution network switching impulse current characteristic has researched with different capacity, different distribution and different load power factor under the different voltage switching angles. The results of the study provide a scientific basis for distribution network line protection setting, in order to further lay the foundation for improvement the validity and reliability of distribution network line protection action.

The objective of this study was to investigate the content of heavy metals (Arsenic, Lead, Chromium and Mercury) in raw milk of Tangshan. Samples were obtained directly from dairy farms in Tangshan City. A total of 55 raw milk samples were collected in 2012, a total of 150 raw milk samples and 150 in 2013 and 2014 respectively. All the samples were analyzed by ICP-MS (Inductively Coupled Plasma Mass Spectrometry) method-based on China National Standard. In general, heavy metals (Arsenic, Lead, Chromium and Mercury) of raw milk in Tangshan were relatively safe for people’s health because none of those heavy metals (Arsenic, Lead, Chromium and Mercury) contents exceeded the Maximum Limit set by China.