The UV/chlorine and UV/H2O2 AOPs on the degradation of naproxen were compared. The efficiency of naproxen was much higher by UV/chlorine compared to UV/H2O2 under all the tested conditions. ClO˙ and CO3˙− played important roles in the degradation of naproxen.

Politeness has been a source of inspiration for research in pragmatics and inter- and intra-cultural communication. However, the existing literature focusses more on how politeness is realized in the context of first language use. Few studies have investigated the issue related to the use of English by second language learners from varying subcultures within the same cultural tradition. The present study examines how Hong Kong and Shanghai tertiary-level learners of English convey politeness in their business letter writing, as reflected in the use of modal sequences. Three hundred business letters were collected from students in Hong Kong and another 300 from students in Shanghai. Majoring in various disciplines, these students were all in their final year of study, and their English proficiency level was generally scored at B2, as compared with the Common European Framework of Reference for Languages. Following a mixed-methods approach, the study tracked a rather complex distribution of politeness realizations by different modal sequences. The findings were that Hong Kong ESL learners appeared to be more strategic users of modal sequences as evidenced by a variety of usage examples from the two purpose-built learner corpora, which were developed to monitor and compare English learners’ business writing at the tertiary level. Another finding was that epistemic modality tended to better preserve politeness in the writing.

No abstract

No abstract

of the material is concerned, specifically the rights of translation, reprinting, reuse of illustrations, recitation, broadcasting, reproduction on microfilms or in any other physical way, and transmission or information storage and retrieval, electronic adaptation, computer software, or by similar or dissimilar methodology now known or hereafter developed. The use of general descriptive names, registered names, trademarks, service marks, etc. in this publication does not imply, even in the absence of a specific statement, that such names are exempt from the relevant protective laws and regulations and therefore free for general use. The publisher, the authors and the editors are safe to assume that the advice and information in this book are believed to be true and accurate at the date of publication. Neither the publisher nor the authors or the editors give a warranty, express or implied, with respect to the material contained herein or for any errors or omissions that may have been made.