..............page:281-283
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POPs and their dangers
yuan dong-liang~1; zhang ying-feng~2; zhang yong-an~3; zheng xang-jun~3 (1.department of chemistry; hong kong university hong kong china; 2.qinhuangdao city no.1 high school; qinhuangdao 06600; china; 3.department of chemistry; beijing normal university; beijing 100875; china)
..............page:193-198
..............page:206-208
..............page:212-214
Study on nanotube's change in nature and photocatalytic capacity
liu ping; li xin-yong; fang ning (key lab for industry ecology and environmental science education; college of environment and life; dalian university of technology; dalian 116024; china; center for nanometer science; dalian university of technology; dalian 116024; china)
..............page:199-205
..............page:254-257
..............page:266-268
..............page:261-263
..............page:264-265
..............page:277-280
..............page:237-241
Uniqueness of limit cycle in prey-predator system with sparssing effect
zhang jiao~1; jin tie-ying~2; cong jing~3 (1.college of science; liaoning petro-chemical university; fusun 113001; china; 2.department of mathematics; bohai university; jinzhou 121013; china; 3.general study program office; liaoning institute of science and technology; fuxin 117022; china)
..............page:226-229
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..............page:245-246
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..............page:233-236
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..............page:209-211