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Chang T.,Jinan Engineering Vocational Technical College
Advanced Materials Research | Year: 2011

As the most potential member in the textile composite material, stitched textile composites have already been paid a lot attention. By the simply technology form and relatively low cost, stitched composites had attracted many domestic and foreign researchers, and were gradually used in various engineering practice. This paper using 3D micro-finite element method researches the mechanical behavior and performance of stitched composites, establishing a 3D micro-finite element model for the stitched composites under the improved locking suture way. Through analysis, it shows that each material's stress distribution characteristics under external loading and finds that the results of this paper's finite element data results matching well with previous studies' results, proving the feasibility of this study, so it can be used for forecasting the mechanical properties of a variety of practical stitched composites. Source


Chang T.,Jinan Engineering Vocational Technical College
Applied Mechanics and Materials | Year: 2011

PLA fiber is a green eco-fiber of excellent properties and sustainable development, with adequate sources of raw materials, low energy consumption, good biodegradability, and excellent physical and mechanical properties, thus the development of this product not only has considerable economic benefits, and also has excellent social benefits. In this paper, through comprehensively testing the properties of PLA fiber, it carries out the systematical analysis and research on the Tests of PLA fiber length, fineness, over length, double length, and defects, combustion property, heat resistance, and hydrolysis property, etc. several aspects. © Trans Tech Publications. Source


Chang T.,Jinan Engineering Vocational Technical College | Han G.,Qingdao University | Zhang Y.,Qingdao University
Optical Materials | Year: 2014

In the present paper, an Ir(III) complex of Ir(PD)(PBT)2 was synthesized, where PD and PBT stand for pentane-2,4-dione and 2-phenylbenzo[d]thiazole, respectively. The molecular identity of Ir(PD)(PBT)2 was confirmed by its single crystal. It was found that Ir(PD)(PBT)2 belonged to monoclinic system with two molecules in each unit cell. Theoretical calculation on Ir(PD)(PBT)2 suggested that the onset electronic transitions owned a mixed character of metal-to-ligand-charge-transfer and ligand-to-ligand-charge-transfer. By doping this complex into a polymer matrix of poly(vinylpyrrolidone) (PVP), the photophysical features of the resulting composite fibers were discussed and compared with those of Ir(PD)(PBT)2 solution. It was found that the immobilization in PVP host could improve the photoluminescence performance by restraining the excited state geometric relaxation, showing higher emission energy, longer excited state lifetime and better photostability. © 2014 Elsevier B.V. All rights reserved. Source


Chang T.,Jinan Engineering Vocational Technical College
Advanced Materials Research | Year: 2011

Given the training objectives of higher vocational education, analyzed teaching model of modular course, discussed the conversion of this teaching model. Schools become professional learning communities. Curriculum focus on students' professional competence. Students more actively participate in teaching. Teachers became "master" of curriculum. It has been proved that the practice effect of this teaching model of modularization curriculum is very good. © (2011) Trans Tech Publications, Switzerland. Source


Song M.W.,Sun Yat Sen University | Huang P.,Sun Yat Sen University | Li F.,South China University of Technology | Zhang H.,Sun Yat Sen University | And 3 more authors.
Environmental Monitoring and Assessment | Year: 2011

Water quality information of Beijiang River, a tributary of Pearl River in Guangdong, China, was analyzed to provide an overview of the hydrochemical functioning of a major agricultural/rural area and an industrial/urban area. Eighteen water quality parameters were surveyed at 13 sites from 2005 to 2006 on a monthly basis. A bivariate correlation analysis was carried out to evaluate the regional correlations of the water quality parameters, while the principal component analysis (PCA) technique was used to extract the most influential variables for regional variations of river water quality. Six principal components were extracted in PCA which explained more than 78% and 84% of the total variance for agricultural/rural and industrial/urban areas, respectively. Physicochemical factor, organic pollution, sewage pollution, geogenic factor, agricultural nonpoint source pollution, and accumulated pesticide usage were identified as potential pollution sources for agricultural/rural area, whereas industrial wastewaters pollution, mineral pollution, geogenic factor, urban sewage pollution, chemical industrial pollution, and water traffic pollution were the latent pollution sources for industrial/urban area. A multivariate linear regression of absolute principal component scores (MLR-APCS) technique was used to estimate contributions of all identified pollution sources to each water quality parameter. High coefficients of determination of the regression equations suggested that the MLR-APCS model was applicable for estimation of sources of most water quality parameters in the Beijiang River Basin. © 2010 Springer Science+Business Media B.V. Source

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