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Title
Novel Silica Tube/Polyimide Composite Films with Variable Low Dielectric ConstantThis work was supported by the Key Research Program of Science and Technology Committee of Beijing City (No. H020420020230), ITF project ZPOD of Hong Kong SAR Government, National High Technical Research and Development Program of China (No. 2003AA305890), and a RGC CERG grant (No. CityU 1049/02E).