Xu G.,Chongqing University of Technology
Sensors and Actuators, B: Chemical | Year: 2014
This paper reported a Hg(II) sensing nanocomposite using a rhodamine derivitive as the sensing probe and an up-conversion NaYF4 lattice as the excitation core. The nanocomposite was covered by silica shell to improve the dispersibility in aqueous solutions. The obtained sample was fully characterized using electron microscopy, XRD analysis, IR spectra, thermogravimetry, UV-Vis absorption and emission spectra. Experimental results suggested that the Hg(II) sensing nanocomposite was successfully constructed, with the efficient energy transfer from the excitation core to the sensing probe confirmed. The emission of the nanocomposite increased with the increasing Hg(II) concentration, showing emission "ff-on" effect. A linear response was obtained. In addition, it was found that the emission of the nanocomposite owned good photostability under continuous radiation and high selectivity towards Hg(II) ion. © 2014 Elsevier B.V.
Hu H.-J.,Chongqing University of Technology
Journal of Manufacturing Processes | Year: 2012
It is important to research the effect of die structures parameters for equal channel angular extrusion (ECAE) on the deformation behavior, strain distribution and loads requirement. ECAE is an extrusion process widely researched for its potential to produce ultra-fine grained microstructures in magnesium alloys. In this paper some three-dimensional (3D) geometric models with different corner angles 90° and 135° and with fillets or not in the bottom die were designed by UG software. Some important isothermal process parameters were regarded as basal conditions used in DEFORM™-3D software such as temperatures, the friction coefficient, and extrusion speed. The deformation heterogeneity of ECAE was analyzed from the simulation and experimental results. The deformation homogeneity caused by the EACE die with fillets was improved comparing with the die without fillets. But the cumulative maximum strains decreased. The requirement extrusion force decreased with the fillets and channel angle increase in ECAE die. From the simulation and experimental results the smaller channel angle can obtain the higher cumulative strains and produce tinier subgrains. The loads of top die decrease mainly with fillets. The ECAE die with the channel angle 90° and fillets is good to improve the plasticity and deformation homogeneity of the billets if the extrusion force is enough. It was demonstrated that the simulation results were in good agreement with experimental results and the theoretical calculation. © 2011 The Society of Manufacturing Engineers.
Gao J.-L.,Chongqing University of Technology
Guangdianzi Jiguang/Journal of Optoelectronics Laser | Year: 2014
The white LED is used not only for lighting, but also as the light source in communication systems. In recent years, as the performance of the optoelectronic devices improves, the indoor visible light communication system has attracted much attention of researches. But the efficient bandwidth of white LED used for illumination is around 1 MHz due to its device characteristics. To improve the rate and the quality of the communication, a demodulation scheme is designed based on pre-distorted 4 amplitude shift keying (4ASK) and the visible light communication transmitting system is constructed. To relieve the LED's bandwidth deficiency, the RC equalization and pre-distorted circuit are used at transmitting terminal of the visible light communication system. The optimization parameters are got by simulation. The hardware circuit of the visible light communication system is built. The experimental results show that t he maximum bit rate is up to 20 Mbit/s, the bit error rate (BER) is less than 10-6, and the communication distance is about 1 m.
Zeng X.-K.,Chongqing University of Technology
IEEE Photonics Technology Letters | Year: 2011
By applying Fourier mode coupling (FMC) theory to the Bragg gratings (BGs) with the effects of Gaussian-apodization, phase shift, superstructure, and linear chirp, the calculations of their reflectivities are fast and accurately achieved, and compared with the practical cases and those on the transfer matrix (TM) method used widely. The results indicate that the FMC theory can be used for the real-time analysis and control in the design and fabrications of nonuniform BG and its mask, of which the efficiency is about several-thousand times that of the TM method. © 2006 IEEE.
Su L.-y.,Chongqing University of Technology
Computers and Mathematics with Applications | Year: 2010
To improve the prediction accuracy of complex multivariate chaotic time series, a novel scheme formed on the basis of multivariate local polynomial fitting with the optimal kernel function is proposed. According to Takens Theorem, a chaotic time series is reconstructed into vector data, multivariate local polynomial regression is used to fit the predicted complex chaotic system, then the regression model parameters with the least squares method based on embedding dimensions are estimated,and the prediction value is calculated. To evaluate the results, the proposed multivariate chaotic time series predictor based on multivariate local polynomial model is compared with a univariate predictor with the same numerical data. The simulation results obtained by the Lorenz system show that the prediction mean squares error of the multivariate predictor is much smaller than the univariate one, and is much better than the existing three methods. Even if the last half of the training data are used in the multivariate predictor, the prediction mean squares error is smaller than that of the univariate predictor. © 2009 Elsevier Ltd. All rights reserved.
Wang Z.-Y.,Chongqing University of Technology
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2016
Despite the ubiquitous character and relevance of the electric double layer in the entire realm of interface and colloid science, very little is known of the effect that surface heterogeneity exerts on the underlying mechanisms of ion adsorption. Herein, computer simulations offer a perspective that, in sharp contrast to the homogeneously charged surface, discrete groups promote multivalent counterion binding, leading to charge reversal but possibly having not a sign change of the electrophoretic mobility. Counterintuitively, the introduction of dielectric images yields a significantly greater accumulation of counterions, which further facilitates the magnitude of charge reversal. The reported results are very sensitive to both the degree of ion hydration and the representation of surface charges. Our findings shed light on the mechanism for charge reversal over a broad range of coupling regimes operating the adsorption of counterions through surface group bridging attraction with their own images and provide opportunities for experimental studies and theoretical development. © 2016 American Physical Society.
Zhang C.,Chongqing University of Technology
Organic and Biomolecular Chemistry | Year: 2014
The incorporation of fluorine-containing moieties into organic compounds is of great importance in pharmaceutical, agricultural, and materials science. Within these organofluorides, the trifluoromethyl group is one of the most important motifs. In recent years, the trifluoromethyl group has attracted more and more attention, and many trifluoromethylated compounds have been found to possess special activities. However, until now, only a few methods have been developed to achieve this efficiently using Umemoto's reagents. This review highlights recent developments in the direct introduction of a trifluoromethyl group into organic compounds with Umemoto's reagents. Seven approaches to the trifluoromethylation of organic compounds are summarized: (i) trifluoromethylation of arenes, (ii) trifluoromethylation of alkenes, (iii) trifluoromethylation of terminal alkynes, (iv) deoxygenative trifluoromethylation of benzylic xanthates, (v) trifluoromethylation of ketoesters, (vi) trifluoromethylation of aryl boronic acids and aromatic amines (synthesis of ArCF3) and (vii) trifluoromethylation of biphenyl isocyanide derivatives. This journal is © the Partner Organisations 2014.
Chongqing University of Technology | Date: 2016-08-04
An electric field type time-grating linear displacement sensor based on a single row multilayer structure, including a moving ruler and a fixed ruler. The moving ruler having a row of induced electrodes and the fixed ruler having a row of excitation electrodes.
Chongqing University of Technology | Date: 2016-08-04
An electric field type time-grating angular displacement sensor, including a rotor and a stator. The rotor includes m rotor electrodes. The rotor electrodes cover a circle on a surface of a rotor body with equal space. The stator includes 4m stator electrodes. The stator electrodes cover a circle on a surface of a stator body with equal space.
Chongqing University of Technology | Date: 2014-11-13
A time grating linear displacement sensor based on an alternating light field, comprising a fixed pole plate and a movable pole plate, wherein the upper part and the lower part of the fixed pole plate are respectively provided with a row of square fixed pole plate light-transmitting surfaces which are uniformly distributed; the upper part and the lower part at the rear of the fixed pole plate are respectively provided with one group of light-emitting devices; the upper part and the lower part of the movable pole plate are respectively provided with two semi-sinusoidal movable pole plate light-transmitting surfaces; and four light-sensitive receiving units are fixed on the movable pole plate, the photoelectric receiving surfaces of the light-sensitive receiving units covering the movable pole plate light-transmitting surfaces. The two groups of light-emitting devices respectively provide an alternating light field. The movable pole plate moves relative to the fixed pole plate.