Yan Tai University

Yantai, China

Yan Tai University

Yantai, China
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Gao K.,Yan Tai University | Lin K.-L.,National Ilan University | Wang D.,Yan Tai University | Hwang C.-L.,National Taiwan University of Science and Technology | And 3 more authors.
Construction and Building Materials | Year: 2014

An alkali-activating solution plays an important role in dissolving Si and Al atoms to form geopolymer precursors and aluminosilicate material. This study explores the effects of the SiO2/Na2O molar ratio (1.0-2.0) on the properties of nano-SiO2 metakaolin-based geopolymers. The setting time, compressive strength, mercury intrusion porosimetry (MIP), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) are investigated to study the properties of the geopolymers. The results show that the compressive strength increased, and that the products of geopolymerization filled pores with curing time, causing the microstructure to become dense. Moreover, a nano-SiO2 metakaolin-based geopolymer sample with a SiO2/Na2O ratio of 1.5 exhibited more strength, higher density, and less porosity. Applying the nano-SiO2 to a geopolymer enhances compactness, improves uniformity, and increases strength. © 2013 Elsevier Ltd. All rights reserved.


Gao K.,Yan Tai University | Lin K.-L.,National Ilan University | Wang D.,Yan Tai University | Hwang C.-L.,National Taiwan University of Science and Technology | And 3 more authors.
Construction and Building Materials | Year: 2013

The mechanical characteristics and structural properties of the products of alkali-activated metakaolin reactions are affected by the raw material composition and the concentration of alkali activator used. This study quantitatively analyzed the effects of the solid-to-liquid ratios and nano-SiO2 additions on the mechanical characteristics and flexural strength of metakaolin-based geopolymers to obtain optimal geopolymer proportions. The weight and short-range network ordering of samples were examined using a thermogravimetric analyzer and 29Si magic-angle spinning nuclear magnetic resonance. Nano-SiO2 particles with the average particle size of 10 nm were added up to 3 wt% to the geopolymer system and could accelerate the geopolymerization as a result of increased geopolymer gels amount and hence increased the flexural strength. The results show that a metakaolin-based geopolymer sample with a solid-to-liquid ratio of 1.03 containing 1% nano-SiO2 exhibited higher strength, higher density, and lower porosity than other samples. These characteristics are essential for understanding the mechanical strength, thermal stability, and fundamental structure of geopolymer systems. The results also indicated the potential for nanotechnology geopolymer applications. © 2013 Elsevier Ltd. All rights reserved.


Chen B.-Y.,National Ilan University | Zhang M.-M.,Yan Tai University | Chang C.-T.,National Ilan University | Ding Y.,Yan Tai University | And 4 more authors.
Bioresource Technology | Year: 2010

This study explored dye decolorization and bioelectricity generation of indigenous Proteus hauseri ZMd44 for dye-bearing wastewater treatment. Chemical structures of azo dyes apparently affected the performance of dye biodecolorization. Additions of diazo dye C.I. reactive blue 160 (RBu160) stimulated simultaneous dye decolorization and bioelectricity generation of ZMd44 in single chamber microbial fuel cells (MFCs). However, high-level additions of RBu160 repressed capabilities of power production in MFC due to competition of electrons used for reductive decolorization. Decolorized intermediates of RBu160-phenyl methadiamine and 5-sulfoanthranilic acid as electron shuttles might mediate electron transport for current generation in MFC. © 2010 Elsevier Ltd. All rights reserved.


Zhang M.-M.,Yan Tai University | Chen W.-M.,National Kaohsiung Marine University | Chen B.-Y.,National Ilan University | Chang C.-T.,National Ilan University | And 4 more authors.
Bioresource Technology | Year: 2010

This study provides a first attempt to explore indigenous strains with excellent decolorization capability from the most biodiverse region in Taiwan for dye-bearing wastewater treatment. Bacterial isolates were obtained via serial selections under selection pressure of the fungicide nystatin and model textile dye(s). According to profiles of protein expression and PCR-augmented 16S rRNA gene analyses for strain identification, >99% of nucleotide sequences in isolated strains were identical to type strains Aeromonas hydrophila, Klebsiella pneumoniae, Enterobacter cancerogenus, Proteus hauseri, Acinetobacter johnsonii. This first-attempt study not only explored most abundant decolorizers in Taiwan, but also compared their color removal performance for further applications. © 2009 Elsevier Ltd. All rights reserved.


Chen B.-Y.,National Ilan University | Ma C.-M.,St. Mary's College | Han K.,Yan Tai University | Yueh P.-L.,National Ilan University | And 2 more authors.
Bioresource Technology | Year: 2016

As known, decolorized metabolites (DMs) were capable to act as electron shuttles (ESs) to enhance color removal of textile dye(s); however, optimal manipulation of such advantages to microbial fuel cell (MFC)-assisted dye decolorization for industrial practicability were still remained open to be disclosed. The novelty of this work was to disclose such DMs-supplementing strategies for the most promising reductive decolorization in MFC-assisted bioremediation. Quantitative assessment clearly indicated that MFCs coupled to DMs accumulation was economically-feasible strategy of bioaugmentation and biostimulation. That is, MFC technology can be applied to select appropriate on-site dye decontamination in the presence of naturally-generating DMs. © 2015 Elsevier Ltd.


Han J.-L.,Yan Tai University | Liu Y.,Yan Tai University | Chang C.-T.,National Ilan University | Chen B.-Y.,National Ilan University | And 2 more authors.
Biodegradation | Year: 2011

This study uncovered microbial characteristics of bioelectricity generation and dye decolorization in single-chamber microbial fuel cells (MFCs) using activated sludge for wine-containing wastewater treatment. Phylogenetic tree analysis on 16S rRNA gene fragments indicated that the predominant strains on anodic biofilm in acclimatized MFCs were Gamma-Proteobacteria Aeromonas punctata NIU-P9, Pseudomonas plecoglossicida NIU-Y3, Pseudomonas koreensis NIU-X8, Acinetobacter junii NIU-Y8, Stenotrophomonas maltophila NIU-X2. Our findings showed that the current production capabilities of these pure strains were only ca. 10% of those of their mother activated sludge, indicating that synergistic interactions among microbes might be the most influential factor to maximize power generation in MFCs. Plus, these electrochemically active strains also performed reductive decolorization of C. I. reactive blue 160, suggesting that bioelectricity generation might be directly associated to azo dye decolorization to deal with electron transfer on anodic biofilm in MFCs. © 2010 Springer Science+Business Media B.V.


Chen B.-Y.,National Ilan University | Chen B.-Y.,Yan Tai University | Zhang M.-M.,Yan Tai University | Ding Y.,Yan Tai University | Chang C.-T.,National Ilan University
Journal of the Taiwan Institute of Chemical Engineers | Year: 2010

This first-attempt study tended to uncover microbial characteristics of simultaneous bioelectricity generation and dye decolorization in air-cathode single-chamber microbial fuel cells (MFCs) using indigenous dye decolorizers (e.g., Acinetobacter johnsonii NIUx72, Enterobacter cancerogenus BYm30, Klebsiella pneumoniae ZMd31). Batch experimental results showed that supplementation of azo dye C.I. reactive blue 160 (RBu 160) simultaneously stimulated dye decolorization and bioelectricity generation for ZMd31. However, such additions of RBu 160 repressed bacterial activity of A. johnsonii NIUx72, E. cancerogenus BYm30 for power production in MFC. Apparently, selecting appropriate electrochemically active microbes is inevitably top-priority for simultaneous bioelectricity generation and dye decolorization in MFCs. © 2010 Taiwan Institute of Chemical Engineers.


Han K.,Yan Tai University | Yueh P.-L.,National Ilan University | Qin L.-J.,Yan Tai University | Hsueh C.-C.,National Ilan University | Chen B.-Y.,National Ilan University
Bioresource Technology | Year: 2015

This study provided a novel evaluation scheme to quantitatively reveal "synergistic" stimulation of microbial fuel cell (MFC)-assisted dye decolorization for industrial practicability. This work also disclosed why dye decolorization was more electrochemically favorable during simultaneous bioelectricity generation and dye decolorization (SBG&DD). Quantitative assessment upon stimulating effects of different decolorized metabolites on BG and DD alone was also implemented for conclusive remarks. Apparently, using MFC as the method of dye decontamination could considerably increase ca. 40-70% of electron transfer capabilities for SBG&DD, thereby significantly improving the performance of dye decontamination. © 2015 Elsevier Ltd. All rights reserved.


Wang Y.,Yan Tai University | Zhang W.,Yan Tai University
International Journal of Quantum Chemistry | Year: 2010

The resistance distance rij between two vertices vi and vj of a connected graph G is computed as the effective resistance between nodes i and j in the corresponding network constructed from G by replacing each edge of G with a unit resistor. The Kirchhoff index Kf(G) is the sum of resistance distances between all pairs of vertices. In this article, following the method of Yang and Zhang in the proof of the Kirchhoff index of liner hexagonal chain, we obtain the closed-form formulae of the Kirchhoff index of liner pentagonal chain Pn in terms of its Laplacian spectrum. Finally, we show that the Kirchhoff index of Pn is approximately one half of its Wiener index. © 2009 Wiley Periodicals, Inc.


Wang Z.,University of Science and Technology of China | Wang P.,Yan tai University
Advanced Materials Research | Year: 2013

In order to meet the demand for higher capacity transmission over optical fiber communication, we propose a new LDPC coded modulation scheme. Using spectrally-efficient modulation format and LDPC codes, the proposed scheme offers an advanced forward error correction (FEC) solution. From the simulation results, we can get the SNR at the bit error rate (BER) of 10-7 as 3.8dB, 5.5dB, and6.9dB when 16-, 32-, and 64-points constellations are used, respectively. © (2013) Trans Tech Publications, Switzerland.

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