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Zhangzhou, China

Chen C.,Zhangzhou Normal College
Yadian Yu Shengguang/Piezoelectrics and Acoustooptics | Year: 2012

In this paper, a new method of the laser etching technology was proposed for the small adjusting parameter of the microwave dielectric ceramics resonator. The FEM for solving the eigenvalue problem was firstly deduced by electromagnetic theory, meanwhile, the shortcomings of the mechanical adjustment resonator parameter was verified with the FEM. Several factors affecting laser etching operation were mainly explored. The relationship between laser etching parameters and resonant frequency variation was obtained through experiments. Finally, the advantage of laser etching technology was verified with self-made dielectric resonator, which its relative frequency error was less than 0.2%. Source


Ye X.,Zhangzhou Normal College
Frontiers in Energy | Year: 2012

Based on the variable heat capacities of the working fluid, the irreversibility coming from the compression and expansion processes, and the heat leak losses through the cylinder wall, an irreversible cycle model of the Miller heat engine was established, from which expressions for the efficiency and work output of the cycle were derived. The performance characteristic curves of the Miller heat engine were generated through numerical calculation, from which the optimal regions of some main parameters such as the work output, efficiency and pressure ratio were determined. Moreover, the influence of the compression and expansion efficiencies, the variable heat capacities and the heat leak losses on the performance of the cycle was discussed in detail, and consequently, some significant results were obtained. © 2012 Higher Education Press and Springer-Verlag Berlin Heidelberg. Source


Li F.-M.,Zhangzhou Normal College | Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Lin L.-P.,Zhangzhou Normal College | And 5 more authors.
Sensors and Actuators, B: Chemical | Year: 2011

Gold nanorods (GNRs) exhibit strong longitudinal surface plasmon resonance absorption (LPA), which is highly dependent on its aspect ratio (length/width). The strong oxidization of Cr (VI) enables it to etch GNRs selectively at tips. The redox etching causes the aspect ratio of GNRs to decrease, resulting in the LPA blue shifts and the color of GNRs distinctly changes. Besides, the blue shift is linear to the concentration of Cr (VI) in the range of 0.1-20 μM. Thus, a non-aggregation based label free colorimetric sensor for the detection of Cr (VI) has been developed based on the selective etching of GNRs. The proposed colorimetric sensor is responsive, simple, sensitive (detection limit is 8.8 × 10-8 M) and selective, and it has been successfully applied to the detection of Cr (VI) in drinking water and sea water. Moreover, the mechanism of colorimetric sensor for the detection of Cr (VI) was also discussed. © 2011 Elsevier B.V. All rights reserved. Source


Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | Lin L.-P.,Zhangzhou Normal College | And 3 more authors.
Sensors and Actuators, B: Chemical | Year: 2013

Dopamine (DA) could reduce Ag+ to Ag on the surface of gold nanorods (AuNRs) to form Au core-Ag shell nanorods (Au@AgNRs) in AuNRs-Ag+-DA system, which caused dielectric function to change, the aspect ratio of AuNRs to decrease and longitudinal plasmon absorption band (LPAB) of AuNRs to blue shift (Δλ), as well as the color of the solution to change obviously. Thus, a non-aggregation colorimetric sensor for rapid determination of DA was developed based on the linear relationship between Δλ and the concentration of DA. The responsive, simple, sensitive and selective colorimetric sensor has been successfully applied to the detection of DA in serum, showing its great practicality. At the same time, the structures of AuNRs and Au@Ag NRs were characterized by transmission electron microscope (TEM). Meanwhile, the sensing mechanism for the detection of DA has been discussed. © 2012 Elsevier B.V. All rights reserved. Source


Liu J.-M.,Zhangzhou Normal College | Wang X.-X.,Zhangzhou Normal College | Jiao L.,Zhangzhou Normal College | Cui M.-L.,Zhangzhou Normal College | And 3 more authors.
Talanta | Year: 2013

Fe3+ can catalyze H2O2 to oxidize along on the longitudinal axis of gold nanorods (AuNRs), which caused the aspect ratio of AuNRs to decrease, longitudinal plasmon absorption band (LPAB) of AuNRs to blueshift (Δλ) and the color of the solution to change obviously. Thus, a rapid response and highly sensitive non-aggregation colorimetric sensor for the determination of Fe3+ has been developed based on the signal amplification effect of catalyzing H2O2 to oxidize AuNRs. This simple and selective sensor with a wide linear range of 0.20-30.00 μM has been utilized to detect Fe3+ in blood samples, and the results consisted with those obtained by inductively coupled plasma-mass spectroscopy (ICP-MS). Simultaneously, the mechanism of colorimetric sensor for the detection of Fe3+ was also discussed. © 2013 Elsevier B.V. Source

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