Exploring language learning and corrective feedback in an eTandem project

Many studies about eTandem and language learning stem from learners in Western institutions of higher education. Unfortunately, there is a lack of research investigating the telecollaboration regarding language development between learners in the East and the West. Against this backdrop, a small-scale, six-week Chinese-English eTandem project focusing on learners’ language learning processes and experiences was undertaken between nine Chinese university students learning English in China and nine British university students learning Chinese in the UK. Multiple datasets were collected from learners’ diaries, synchronous Skype communication recordings, email exchanges, interviews and a post-project survey. This paper reports the main language error types made by Chinese L2 learners of English and error correction strategies provided by eTandem partners of competent L1 English speakers, along with how Chinese participants responded to the corrections. A thorough analysis of the research data indicated three types of linguistic errors in written tasks made by Chinese L2 learners of English: grammatical, lexical and idiomatic expressions. Another finding was that, although explicit written correction was the most commonly used strategy in email exchanges, learners preferred explanations with examples. In addition to previously established gains of eTandem learning, such as authentic communication, forging friendship and promoting intercultural awareness, positive responses to competent L1 partners’ error corrections was another major benefit indicated in our data. Our study pinpoints the importance of both pre-project training of participants on error-correction strategies with examples and how to respond to partner feedback in future eTandem projects

Study of the Synergistic Effect of Induction Heating Parameters on Heating Efficiency Using Taguchi Method and Response Surface Method

This work designed an intercalation internal induction heating coil in a mold and drew a plate-type steel for the heating mold (size: 300 mm × 200 mm × 40 mm). First, to explore the influence rule of special-shaped coils on induction heating effects, the temperature rise curve on the mold surface was simulated at different heating depths, currents, and frequencies. Next, the extent to which these three factors affect the maximum mean temperature and temperature uniformity was discussed using the Taguchi method and the analysis of variance (ANOVA). Results show that heating depth and current are important factors influencing the target results, while frequency only has a small impact. The maximum mean temperature reaches its peak level when the heating depth, current, and frequency are at the respective values of 5 mm, 1200 A, and 40 KHz and the optimal temperature uniformity can be achieved when these values are 7 mm, 800 A, and 20 KHz, respectively. Finally, the synergistic effect of different factors on target results was analyzed using the response surface method (RSM)

Research on Influencing Factors and Analysis Model Construction of Distribution Network Investment Demand

In recent years, as the scale of investment in the distribution network of power grid companies has continued to remain high, there have also been problems of heavy investment and light income to varying degrees, and investment waste has occurred from time to time. Therefore, it is urgent to strengthen the level of investment efficiency of the distribution network. Based on the systematic analysis of the influencing factors of the investment demand of the distribution network, this paper constructs an analysis model of the investment demand of the distribution network to provide reference and reference for the power grid enterprises to improve the investment efficiency and efficiency level

Research on Evaluation and Optimization Methods of Power Grid Investment Projects Based on Effectiveness Contribution

Facing the current complex operation and management situation, power grid companies must improve the level of precision investment and improve the efficiency of project input and output. Based on the different goals of project investment, this paper uses comprehensive benefit evaluation methods to carry out micro-investment demand analysis from the project dimension, builds a quantitative evaluation index system for comprehensive benefits of power grid projects based on effectiveness contribution evaluation, and combines the analytic hierarchy process and entropy weight method to determine the index weights. Analyze the contribution degree of each project to the power grid after it is put into production through indicators, and realize the priority ranking of power grid investment projects according to the comprehensive benefit evaluation score of the project. The research results can provide reference and reference for improving the output efficiency of power grid investment projects

Influence factors analysis of ionized field characteristics of Zhangbei ±500kV flexible direct current transmission lines

The ionized field should be controlled in order to insure the environmental friendliness of high voltage direct current (HVDC) transmission lines. Different with traditional HVDC transmission lines, the metal return lines is first employed in Zhangbei ±500kV flexible HVDC lines. In this paper, the characteristics of ionized field with and without metal return lines are calculated on the basis of numerical method with Deutsch’s assumption. The influence factors, i.e. roughness coefficient, distance between metal return line and height of the metal return line, are analysed in detail. The results show that the metal return lines will have a shield effect on the ionized field on the ground. The distribution of ionized field is nearly independent on the height of metal return line. The shielding effect of the metal return line mainly contributes to the projection position of the metal return line. The presented results can give instructions for the design and control of the ionized field level of flexible HVDC lines with metal return lines