Chung Yuan Christian University

About: Chung Yuan Christian University is a education organization based out in Taoyuan City, Taiwan. It is known for research contribution in the topics: Membrane & Fuzzy logic. The organization has 9819 authors who have published 11623 publications receiving 213139 citations. The organization is also known as: Tiong-gôan-tāi-ha̍k & CYCU.

Fuzzy multiple-criteria decision making in the determination of critical criteria for assessing service quality of travel websites

Abstract: Travel websites provide customers diverse services including travel information and products through the internet. More and more people are used to plan their itineraries and acquire travel information by visiting travel websites. In the face of the strong competition environment, in order to profit by making customers proceed with transactions on the websites, travel websites should pay more attention to the improve the electronic service quality (e-SQ). e-SQ evaluation for travel websites can be treated as a multiple-criteria decision making (MCDM) problem modeled by the given hierarchical structure. As for evaluating e-SQ, since the traditional Likert scales cannot deal with uncertain assessments according to human intuition for the service quality evaluation, the fuzzy number is employed to measure decision-makers' subjective preference. This paper aims to develop a genetic-algorithm-based method to automatically determine the degrees of importance of respective criteria. Then, critical criteria for evaluating service quality can be easily identified. In the empirical study, four representative travel websites in Taiwan are selected to determine the critical criteria concerned by customers. The findings provide useful information to travel websites for improving e-SQ.

Absorption of carbon dioxide by the absorbent composed of piperazine and 2-amino-2-methyl-1-propanol in PVDF membrane contactor

Abstract: This paper tests the performance of microporous polyvinylidinefluoride (PVDF) hollow fiber in a gas absorption membrane process (GAM) using the aqueous solutions of piperazine (PZ) and 2-amino-2-methyl-1-propanol (AMP). Experiments were conducted at various gas flow rates, liquid flow rates and absorbent concentrations. Experimental results showed that wetting ratio was about 0.036% when used with the aqueous alkanolamine solutions, while that was 0.39% with aqueous piperazine solutions. The CO 2 absorption rates increased with increasing both liquid and gas flow rates at N Re 2 . The CO 2 absorption rate was much enhanced by the addition of PZ promoter. The resistance of membrane was predominated as using a low reactivity absorbent and can be neglected as using absorbent of AMP aqueous solution. The resistance of gas-film diffusion was dominated as using the mixed absorbents of AMP and PZ. An increase of PZ concentration, the resistance of liquid-film diffusion decreased but resistance of gas-film increased. Overall, GAM systems were shown to be an effective technology for absorbing CO 2 from simulated flue gas streams, but the viscosity and solvent–membrane relationship were critical factors that can significantly affect system performance.