The Effect of Al_2O_3 on the Alkali-Ssilica Reaction
feng xiao-xin~1; feng nai-qian~2 (1.college of materials science and technology; hebei polytechnic university; tangshan hebei 063009; china; 2.department of civil engineering; tsinghua university; beijing 100084; china)
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A Novel FIR Filter
huang xiao-hong~1; yang jin-chuan~1; wang zhao-hua~2 (1.college of information; hebei polytecnic university; tangshan hebei 063009; china; 2.college of communication; tianjin university; tianjin 300072; china)
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