Abstract. With the developing of ultrasound technology and expending of it's application scope, new requirements for the structure and the energy radiation of the transducer are presented. A reasonable design and manufacture of the transducer ensures that the energy can be transmitted with minimal loss. Based on the longitudinal vibration equation, a sandwich piezoelectric transducer which can be used in the field of precision machining, medical and other fields is designed and simulated in this paper. Different from the ordinary transducer, the front cover of this transducer is also a horn which can amplify the output amplitude compared to an equal section circular bar. ANSYS15.0 is used to calculate and analyze the transducer model with using HyperMesh (HM) software to generate the mesh to ensure the quality of the mesh. The finite element analysis software can calculate the transducer modal and harmonic response, and the results can be used to compare with theoretical design. The design frequency of the transducer is 20 kHz, the error between the simulation and the theoretical value is less than five percent, the result obtained by ANSYS is very close to the theoretical design.

Abstract. Phonics is one important part of language learning and it contributes to language literacy through involving learners understanding the relationship between letter form and speech sound. It's made evident that younger learners are shown the ability to learn a foreign language in many researches and thereby phonics should be taught systematically as part of a balanced and integrated English language program. It's found that the impact of phonics instruction on development of pre-school English language learners could be reflected and denoted in four parts or areas of language learning, i.e. pronunciation development of pre-school learners, spelling development of pre-school learners, vocabulary development of pre-school learners and reading development of pre-school learners. It's hoped that this research provides a useful reference for future phonics instruction practice among younger English language students.

To solve the problem of defect detection in printed fabrics caused by abundant colors and varied patterns, a defect detection method based on RGB accumulative average method (RGBAAM) and image pyramid matching is proposed. First, the minimum period of the printed fabric is calculated by the RGBAAM. Second, a Gaussian pyramid is constructed for the template image and the detected image by using the minimum period as a template. Third, the similarity measurement method is used to match the template image and the detected image. Finally, the position of the printed fabric defect is marked in the image to be detected by using the Laplacian pyramid restoration. The experimental results show that the method can accurately segment the printed fabric periodic unit and locate the defect position. The calculation cost is low for the method proposed in this article.

Abstract. The knowledge of a language is not only of academic value, but language in the wider sense also combines economic meanings. In designing practical training system for EFL learner autonomy, the principles of the issue of local economic development, and the synergy of language and economy should be considered and highlighted in view of local economic development. The major argument is that practical training system including curriculum-based practical training system, extracurriculum-based practical training system and post-based practical training system should be integrated into EFL learning framework so as to enhance the development of EFL learner individuals and local economy at large.

Abstract. Flipped classroom is proved popular amongst the instructors across the globe and it is already being embraced to a certain extent by scholars in universities and schools. There are some truth in the idea that flipped classroom is applied and experimented in cultivating Liaoning scientific foreign language talents in China. Based on the discussion of origin of flipped classroom, wisdom behind flipped classroom and development of flipped classroom, the dynamics of the flipped classroom model is analyzed whilst teachers instructing scientific foreign language in Liaoning province. It could be argued that three main stages of flipped classroom in cultivating scientific foreign language talents should be given much emphasis to, which is the reflection on first exposure outside of school day, the construction of knowledge through classroom activities, and the engagement in scientific foreign language learning community. It's hoped that an engaging and productive flipped classroom is formed in combination with the actual teaching condition in China's scientific foreign language pedagogy.