Nghiên cứu mối quan hệ của ong ngoại ký sinh Euplectrus xanthocephalus Girlault với vật chủ sâu khoang Spodoptera litura (Fabricius)

http://repository.vnu.edu.vn/handle/VNU_123/37309
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Viện sinh thái và tài nguyên sinh vật
Appears in Collections:HUS - Dissertations

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Nghiên cứu điều chế nanocompozit polyme/bentonit-DMDOA

http://repository.vnu.edu.vn/handle/VNU_123/36973 Keywords Hóa vô cơ, Sét hữu cơ, Vật liệu Nano, Sét bentonit Citation Trịnh, H. D. (2012). Đánh giá biến đổi khí hậu ở Việt Nam bằng các chỉ số biến đổi khí hậu. Luận văn Thạc sỹ, Đại học Quốc gia Hà Nội, Việt Nam Publisher Trường Đại học Khoa học Tự nhiên Appears in Collections: HUS - Dissertations
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The Effect of Task Type on Accuracy and Complexity in IELTS Academic Writing

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http://repository.vnu.edu.vn/handle/VNU_123/942 IELTS is one of the most popular international standardized tests of English language proficiency. Its two academic writing tasks are crucially different in cognitive and linguistic demands, but to date, few studies have compared thein fluence of their different task demands on test-takers’ performance. In second language research (L2) area, two contrasting theories on task demands are the Limited Attentional Capacity Model which predicts a worse linguistic performance on a more complex task and the Cognition Hypothesis which expects a better performance on a more demanding task. My study examines the effect of task type as an important factor of task complexity on L2 writing in a testing condition. The study was a single-factor, repeated-measures design which compares the performance of 30 L2 writers on task 1 and task 2 of the IELTS Academic writing subtest. The candidates’ writing samples were analyzed using a range of...
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High bandwidth all-optical 3x3 switch based on multimode interference structures

http://repository.vnu.edu.vn/handle/VNU_123/28156 A high bandwidth all-optical 3×3 switch based on general interference multimode interference (GI-MMI) structure is proposed in this study. Two 3×3 multimode interference couplers are cascaded to realize an alloptical switch operating at both wavelengths of 1550 nm and 1310 nm. Two nonlinear directional couplers at two outer-arms of the structure are used as all-optical phase shifters to achieve all switching states and to control the switching states. Analytical expressions for switching operation using the transfer matrix method are presented. The beam propagation method (BPM) is used to design and optimize the whole structure. The optimal design of the all-optical phase shifters and 3×3 MMI couplers are carried out to reduce the switching power and loss. Title:  High bandwidth all-optical 3x3 switch based on multimode interference structures Authors:  Le, Duy Tien Cao, Dung Truong Le, Trung Thanh Keywo...
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