二语听力研究、教学和测评是近年来二语研究的重点之一,但相关研究与教和测往往脱节,且该领域仍缺乏系统性综述研究。在此背景下,《劳特利奇二语习得与听力手册》(The Routledge Handbook of Second Language Acquisition and Listening...二语听力研究、教学和测评是近年来二语研究的重点之一,但相关研究与教和测往往脱节,且该领域仍缺乏系统性综述研究。在此背景下,《劳特利奇二语习得与听力手册》(The Routledge Handbook of Second Language Acquisition and Listening)于2024年正式出版,由二语听力习得研究领域的三位权威学者Elvis Wagner、Aaron Olaf Batty和Evelina Galaczi担任主编。该书首次全面地呈现了二语习得视域下听力研究的理论基础、核心议题、教学和测评实践以及新兴议题,并基于现有研究成果,在批判继承的基础上提出前瞻性建议,为二语听力研究者、教师和学生提供了兼具理论深度与实践价值的专业指南。本文将简要介绍和评价该书内容。展开更多
Fluorographene(FG)with narrow lateral size and thickness distributions was prepared by a liquid-phase exfoliation method,based on liquid cascade centrifugation.The Rtec MFT-5000 tribo-meter was used to investigate the...Fluorographene(FG)with narrow lateral size and thickness distributions was prepared by a liquid-phase exfoliation method,based on liquid cascade centrifugation.The Rtec MFT-5000 tribo-meter was used to investigate the lubricating performance of bentonite grease enhanced by the as-prepared FG.The results showed that the coefficient of friction and the wear volume of bentonite grease with 0.3 wt%FG were decreased by 20.4%and 44.9%,respectively,as compared to those of the base grease.The main reason is that FG can promote the formation of the tribo-chemical reaction film consisting of complex carbon oxide,Fe_(2)O_(3)and FeF_(3)on the friction surface,which can remarkably improve the performance of friction reduction and prevent the appearance of severe wear.展开更多
文摘二语听力研究、教学和测评是近年来二语研究的重点之一,但相关研究与教和测往往脱节,且该领域仍缺乏系统性综述研究。在此背景下,《劳特利奇二语习得与听力手册》(The Routledge Handbook of Second Language Acquisition and Listening)于2024年正式出版,由二语听力习得研究领域的三位权威学者Elvis Wagner、Aaron Olaf Batty和Evelina Galaczi担任主编。该书首次全面地呈现了二语习得视域下听力研究的理论基础、核心议题、教学和测评实践以及新兴议题,并基于现有研究成果,在批判继承的基础上提出前瞻性建议,为二语听力研究者、教师和学生提供了兼具理论深度与实践价值的专业指南。本文将简要介绍和评价该书内容。
基金Funded by Science and Technology Research Program of Chongqing Municipal Education Commission(No.KJZD-K202212905)Natural Science Foundation of Chongqing,China(No.cstc2019jcyj-msxmX0453)。
文摘Fluorographene(FG)with narrow lateral size and thickness distributions was prepared by a liquid-phase exfoliation method,based on liquid cascade centrifugation.The Rtec MFT-5000 tribo-meter was used to investigate the lubricating performance of bentonite grease enhanced by the as-prepared FG.The results showed that the coefficient of friction and the wear volume of bentonite grease with 0.3 wt%FG were decreased by 20.4%and 44.9%,respectively,as compared to those of the base grease.The main reason is that FG can promote the formation of the tribo-chemical reaction film consisting of complex carbon oxide,Fe_(2)O_(3)and FeF_(3)on the friction surface,which can remarkably improve the performance of friction reduction and prevent the appearance of severe wear.
