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.

First-Principles Study of CO Adsorption and Oxidation on Ru-Doped CeO2(111) Surface

Abstract: The interaction and mechanism for CO oxidation on a Ru-modified CeO2 surface have been investigated by using periodic density functional theory calculations corrected with the on-site Coulomb interaction via a Hubbard term (DFT + U). Our calculations showed that (i) the Ru dopant facilitates oxygen vacancy formation, while the Ru adatoms may suppress oxygen vacancy formation. (ii) Physisorbed CO, physisorbed CO2, and chemisorbed CO (carbonite, CO2–) species are observed on the Ru-doped CeO2(111) surface; in contrast, only physisorbed CO is found on the clean CeO2(111) surface. The vibrational frequency calculations are carried to characterize these species. (iii) Incorporating Ru ions into the ceria lattice as substitutional point defects can instead sustain a full catalytic cycle for CO oxidation and catalyst regeneration. The Ru dopant promotes CO oxidation without any activation energy leading to O vacancy formation and CO2 desorption. Molecular O2 adsorbs at the O vacancy forming O adspecies that then...

Novel organosoluble aromatic polyimides bearing pendant methoxy‐substituted triphenylamine moieties: Synthesis, electrochromic, and gas separation properties

Abstract: Four series of polyimides I-VI with pendent triphenylamine (TPA) units having inherent viscosities of 0.44-0.88 dL/g were prepared from four diamines with two commercially available tetracarboxylic dianhydrides via a conventional two-step procedure that included a ring-opening polyaddition to give polyamic acids, followed by chemical cyclodehydration. These polymers were amorphous and could afford flex- ible films. All the polyimides had useful levels of thermal stability associated with high softening temperatures (279-300 � C), 10% weight-loss temperatures in excess of 505 � C, and char yields at 800 � C in nitrogen higher than 58%. The hole-transporting and electrochromic properties were examined by electrochemical and spectroelectro- chemical methods. Cyclic voltammograms of the polyimide films cast onto an indium- tin oxide (ITO)-coated glass substrate exhibited a or two reversible oxidation couples at 0.65-0.78 and 1.00-1.08 V versus Ag/AgCl in acetonitrile solution. The polymer films revealed electrochromic characteristics with a color change from neutral pale yellowish to blue doped form at applied potentials ranging from 0.00 to 1.20 V. The CO2 permeability coefficients (PCO2 ) and permeability selectivity (PCO2 /PCH4 ) for these polyimide membranes were in the range of 4.73-16.82 barrer and 9.49-51.13, respec- tively. V C 2008 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 46: 7937-7949, 2008

Controlling hyperchaos of the Rossler system

Abstract: A feedback control is designed to regulate the hyperchaotic behaviour of the Rossler oscillator. Two inputs are added to the system for the control where each of the inputs contains two portions of feedback. One of the feedback parts is to construct an equilibrium manifold by modifying the dynamics of the system, while the other is the proportional feedback part which will control the hyperchaotic state to desired states on the manifold. In the design, the desired states include fixed points as well as limit cycles. Some numerical experiments are presented to perform the control. As expected, and also verified by the numerical results, the hyperchaotic system can be well tracked to the desired state by the present design. Furthermore, the settling times of the tracking can be improved by increasing the proportional gains of the control.

Scaffold-hopping strategy: synthesis and biological evaluation of 5,6-fused bicyclic heteroaromatics to identify orally bioavailable anticancer agents.

Abstract: Utilizing scaffold-hopping drug-design strategy, we sought to identify a backup drug candidate for BPR0L075 (1), an indole-based anticancer agent. For this purpose, 5,6-fused bicyclic heteroaromatic scaffolds were designed and synthesized through shuffling of the nitrogen from the N-1 position or by insertion of one or two nitrogen atoms into the indole core of 1. Among these, 7-azaindole core 12 showed potent in vitro anticancer activity and improved oral bioavailability (F = 35%) compared with 1 (F < 10%).