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In this work, typical polybenzoxazine, as new class of phenolic resin, has been used as a matrix for preparing a series of high performance hybrid materials using various amounts of titanium carbide (TiC) ranging between 0-10 wt% as fillers, via a solution blending technique. The thermal properties of bisphenol A-aniline base benzoxazine monomers (BA-a) and TiC mixtures have been studied by differential scanning calorimetry (DSC). The thermal stability of their cured hybrids has been tested by means of thermogravimetric analysis (TGA). The result showed that the glass transition temperature of the prepared composites increased with increasing the amount of TiC to reach a higher value at 194°C. Also, the incorporation of TiC nanoparticles has considerably improved the thermal stability of the hybrids including the char yield which increase by 50 % at 10 wt% TiC content.

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Abstract. In this paper, the existence and multiplicity of solution of periodic solutions of p-Laplacian boundary value problem are studied by using degree theory and upper and lower solutions method. Some known results are improved.

Taiwan has actively promoted the strategy of energy efficiency for all companies and organizations. The government has set a target of energy efficiency of 33% by 2025. This research applied DEA malmquist index to assess technical efficiency, and to reveal trends of productivity change in Taiwan energy companies. The DEA malmquist index is a distinguished research method using to measures productivity change over time period. The proposed method can be decomposed into two components, technical change and technological change. A panel data was collected from Taiwan Stock Exchange Market recorded 2008-2011. The research was illustrated with financial data of selected companies, and their productivity was carefully analyzed. The empirical results showed that the technical efficiency of five energy companies performed efficiently with the highest score of 1.000. An average technical efficiency score was pretty high with 0.938. Moreover, trend in productivity change regressed due lack of technological improvement.