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.

The effects of gas counter pressure and mold temperature variation on the surface quality and morphology of the microcellular polystyrene foams

Abstract: In this study, we developed a foaming control system using the Gas Counter Pressure (GCP) combined with mold temperature control during the microcellular injection molding (MuCell) process and investigated its influence on the parts' surface quality and foams structures. The results revealed that under GCP control alone when GCP is greater than 10 MPa, part surface roughness for transparent polystyrene (PS) improved by 90%. When GCP increased, the skin thickness also increased, the weight reduction decreased and the average cell size reduced to about 30 μm. For black PS parts, when GCP is greater than 10 MPa, the part gloss reaches the same value as that molded by conventional injection molding. By increasing gas holding time, the cell density decreased and the cell size distribution became more uniform. The increase in amount of supercritical fluid foaming agent also increased the cell density. Applying mold temperature control alone with temperature in the range of 90–120°C (near Tg), the surface roughness improved by 65%. Increasing mold temperature decreased the skin thickness; however, the cell size distribution became significantly nonuniform. It was found that thin skin, small and uniform cell size as well as good surface quality can be achieved efficiently by simultaneous combining of GCP and mold temperature control. The proposed innovative approach may lead to a significant improvement and a more broad application for MuCell process. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Ag(I) Complexes Containing Flexible N,N′-Di(3-pyridyl)adipoamide Ligands: Syntheses, Structures, Ligand Conformations, and Crystal-to-Crystal Transformations

Abstract: The reactions of N,N′-di(3-pyridyl)adipoamide (L) with the corresponding silver(I) salts afforded the complexes {[Ag(L)](PF6)·2CH3CN}∞, 1, {[Ag(L)](BF4)·CH3CN}∞, 2, {[Ag(L)](NO3)·CH3CN}∞, 3, {[Ag(L)](PF6)·4DMF}∞, 4, {[Ag(L)](BF4)·4DMF}∞, 5, {[Ag(L)](CF3SO3)·DMF}∞, 6, {[Ag(L)](ClO4)·CH3CN}∞, 7, {[Ag(L)](ClO4)}∞,8, [Ag2(L)2](p-TsO)2·2CH3CN (p-TsO = p-toluenesulfonate), 9, and [Ag(L)(p-TsO)]∞, 10. Complex 1 forms a one-dimensional (1D) concavo-convex chain, and complexes 2, 3, 6, and 7 show 1D polymeric pairs of zigzag chains supported by the Ag---Ag and π–π interactions, whereas complexes 4, 5, and 8 adopt zigzag chains. Complex 9 forms a zero-dimensional (0D) dinuclear metallocycle, and complex 10 shows a two-dimensional (2D) pleated grid with a {4,82} topology, respectively. The L ligands in these complexes adopt various ligand conformations, which are subjected to the changes of the counteranions and solvents, resulting in the different structural types. Reversible crystal-to-crystal transformation was o...

A device for skin moisture and environment humidity detection

Abstract: Water content detection is important for our daily life. For environmental detection, the relative humidity is an index for comfortable living atmosphere. For skin health, the water content in stratum corneum is a parameter to diagnose the skin condition. This paper mainly describes a moisture sensor for determination of human skin moisture. The skin moisture sensor is based on the conventional humidity sensor structure (interdigital capacitance, IDC), and the moisture sensor is also sensitive to the environmental humidity. Therefore, the effects of the environment, temperature and humidity, are discussed to find the appropriate operation conditions for skin moisture detection. Besides, the application of the moisture sensor for the environment detection is also described. The IDC structure is fabricated by using printed circuit board (PCB) technology which simplifies the bonding technique and reduces the cost.