Robot Technology Used for Special Environment Key Laboratory of Sichuan Province

Mianyang, China

Robot Technology Used for Special Environment Key Laboratory of Sichuan Province

Mianyang, China

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Xing L.,Southwest University of Science and Technology | Xing L.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Ma Q.,Southwest University of Science and Technology | Ma Q.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | And 2 more authors.
Beijing Youdian Daxue Xuebao/Journal of Beijing University of Posts and Telecommunications | Year: 2015

In order to characterize local features of network redundant traffic on small-time scale more accurately, a new Cauchy-Laplace multifractal wavelet model was proposed. An algorithm for estimating parameters of wavelets was also put forward. A joint distribution function was adopted to describe local features, i.e., Cauchy and Laplace distributions were used to obtain the parameter multiply factors for heavy-tailed and spike features, respectively. A threshold for ratio of wavelets to scaling parameters, which decides how these two distributions affected redundant traffic modeling, was achieved by probability comparison. Experiments show that the proposed model can well characterize small-time scale multifractal features of network redundant traffic. © 2015, Beijing University of Posts and Telecommunications. All right reserved.


Xu F.,Southwest University of Science and Technology | Xu F.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Zhou S.,South China University of Technology | Hu S.,CAS Chengdu Institute of Optics and Electronics | And 5 more authors.
Optics Express | Year: 2015

We explore the feasibility of a controllable and easy-toimplement moiré-based composite circular-line gratings imaging scheme for optical alignment in proximity lithography. One circular grating and four line gratings located on both the mask alignment mark and wafer alignment mark are used to realize the coarse alignment and fine alignment respectively. The fundamental derivation of coarse alignment employing circular gratings and fine alignment employing line gratings are given. Any displacement of misalignment that occurs at the surface of two overlapped gratings can be sensed and determined through subsequent fringe phase analysis without the influence of the gap between the mask and the wafer or wafer process. The design and manufacture process of the alignment marks are presented. The experimental results validate and demonstrate the feasibility of the proposed approach. © 2015 Optical Society of America.


Xu F.,Southwest University of Science and Technology | Xu F.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Hu S.,CAS Chengdu Institute of Optics and Electronics
Guangzi Xuebao/Acta Photonica Sinica | Year: 2014

The phase unwrapping method based on the polar coordinate to get the alignment offset was proposed for the wrapped phase generated after the single closed interference fringe phase extraction in alignment of nanolithography. The phase distribution of the fringe pattern occurs in the relative movement between two circular gratings was transformed from rectangular coordinates system to polar coordinates system firstly; then the relationship between the alignment offset and the phase parameter was analysis in polar coordinates system; the initial phase amplitude and phase delay in different radial radius were got to acquire the alignment offset finally. The feasibility of the method was verified by numerical simulation and experiment and the comparisons of the tradition least squares method and path tracking method are given. The results show that the wrapped phase can be unwrapped for the alignment with high precision in tens of nanometers through the method with good adaptability. ©, 2014, Chinese Optical Society. All right reserved.


Xu F.,Southwest University of Science and Technology | Xu F.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Zhou S.,South China University of Technology | Hu S.,CAS Chengdu Institute of Optics and Electronics
Optik | Year: 2014

The fringe pattern phase analysis method is proposed for the leveling of mask and wafer in proximity lithography. The tilt between mask and wafer in the space is reflected in the tilted fringe pattern. The method combining the 2-D Fourier transform and 2-D Hanning window is proposed for processing the tilted fringe pattern. The offset and angle of tilt are extracted through phase analysis. Computer simulation and experiment are both performed to verify this method. The results indicate that the tilt of the mask and wafer in the space can be extracted with high accuracy through this method. © 2014 Elsevier GmbH.


Zhou J.Z.,Southwest University of Science and Technology | Zhou J.Z.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Jian W.Y.,Southwest University of Science and Technology | Jian W.Y.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province
Applied Mechanics and Materials | Year: 2014

Battery state of charge (SOC) can directly reflect its sustainable power supply capacity and health. It is important basis to formulate balance and energy management strategy for battery management system (BMS). In this paper, a second-order RC battery model with factors affected battery characteristics was established based on the Gauss-Hermite quadrature filter (GHQF) theory. According to Kirchhoff's law a state space model was established and the parameters in the model were identified. The GHQF algorithm and model were verified, and comparison was made to an extended Kalman filter (EKF) algorithm on the Matlab and Simulink simulation platform. © (2014) Trans Tech Publications, Switzerland.


Guo F.,Southwest University of Science and Technology | Guo F.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Li H.,Southwest University of Science and Technology | Liu J.,Southwest University of Science and Technology
Chinese Journal of Physics | Year: 2015

Stochastic resonance (SR) in a second-order linear oscillator with quadratic trichotomous noise driven by an external periodic signal is investigated. By applying the property of the trichotomous noise and using the Shapiro-Loginov formula, the exact expression for the output spectral amplification (SPA) of the oscillator is obtained. Results show that the SPA varies non-monotonically with the amplitude, with the correlation rate, with the flatness of the trichotomous noise, as well as with the frequency of the driving signal. Moreover, the non-monotonic dependence of the SPA on the damping coefficient, on the frequency of the linear oscillator, as well as on the coefficient of the quadratic noise is also found. © 2015 The Physical Society Of The Republic Of China.


Guo F.,Southwest University of Science and Technology | Guo F.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Li H.,Southwest University of Science and Technology | Liu J.,Southwest University of Science and Technology
Physica A: Statistical Mechanics and its Applications | Year: 2014

The stochastic resonance (SR) in a second-order linear system driven by a trichotomous noise and an external periodic signal is investigated. By the use of the properties of the trichotomous noise and the Shapiro-Loginov formula, the exact expression for the output spectral amplification (SPA) of the system is obtained. The non-monotonic influence of the coefficient of the trichotomous noise on the SPA is found. It is shown that the SPA is a non-monotonic function of the amplitude, the correlation rate and the probability of the trichotomous noise. The SPA varies non-monotonically with the frequency of the driving signal, the damping coefficient and the frequency of the linear system. © 2014 Elsevier B.V. All rights reserved.


Liu Q.-C.,Southwest University of Science and Technology | Deng H.,Southwest University of Science and Technology | Deng H.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Shang L.-P.,Southwest University of Science and Technology | Shang L.-P.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2016

The physicochemical characteristics of alpha and beta HMX which are isomers are quite different. In order to make a quantitative analysis of alpha and beta HMX mixtures, both pure and mixed alpha/beta HMX were detected and analyzed using of terahertz time-domain spectroscopy (THz-TDS) and THz absorption spectra were obtained. The THz absorption spectra of alpha/beta HMX mixtures were analyzed using linear fitting technique, and the forecast equations were set up to predict unknown samples. The results show that the absorption intensity of alpha/beta mixtures at 0.82 THz range has a good linear relationship with the content of alpha HMX. The absorption characteristics of alpha/beta HMX mixtures at 0.82 THz can be used for quantitative detection. © 2016, Science Press. All right reserved.


Lu M.,Southwest University of Science and Technology | Li X.-X.,Southwest University of Science and Technology | Li X.-X.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | Shang L.-P.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | And 2 more authors.
Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis | Year: 2016

Terahertz frequency resolution is an important factor affecting substance identification, but the presence of the device reflection within the terahertz time domain spectroscopy systems, causes the presence of a plurality of reflection peaks in the reference and measurement signals with low frequency resolution, because of the length truncation of time domain signal. In order to remove the influence of the reflection peak, this paper proposes a method based on empirical mode decomposition to remove the time domain reflection peak, to improve the terahertz frequency resolution. The time domain reflection peaks are positioned by correlation with the real terahertz peak, calculating the reflection peak upper and lower envelope and an average, obtaining intrinsic mode functions, and alternating reflection peaks with intrinsic mode functions, the effective length of the time domain signal is increased to improve the terahertz frequency resolution. Water vapor in the air terahertz transmission spectroscopy results show that this method can self adaptively remove a plurality of reflection peaks and has good repairing effect on the terahertz time-domain signal; the frequency resolution is increased by 12 times; and the useful information of absorption spectrum is not lost; the absorption peak position and the number is consistent with real spectrum; the terahertz spectrum ability to identify is well preserved. © 2016, Peking University Press. All right reserved.


Li Z.-F.,Southwest University of Science and Technology | Wang R.-W.,Southwest University of Science and Technology | Deng H.,Southwest University of Science and Technology | Deng H.,Robot Technology Used for Special Environment Key Laboratory of Sichuan Province | And 2 more authors.
Faguang Xuebao/Chinese Journal of Luminescence | Year: 2016

In order to verify the laser induced breakdown spectroscopy (LIBS) is feasible for the detection of heavy metal elements in Chinese traditional medicine, using coptis chinensis, aconite root and poria cocos as detection object, a series of Cu element samples with different concentrations were prepared. 1064 nm Nd:YAG solid pulse laser was used as the excitation source, the eight channel spectrometer was used for spectral data acquisition. Cu 324.7 nm was selected as characteristic spectral line, and the optimal delay time was determined for 0.5 μs. According to the different substrate conditions of coptis chinensis, aconite root and poria cocos, the appropriate internal standard parameters were selected, and the linear degree was 0.986, 0.931, 0.975, respectively. The results were compared with the results of direct calibration. The experiment results show that the internal standard method can improve fitting accuracy and LIBS can be used for the rapid detection of heavy metal Cu pollution of traditional Chinese medicine. © 2016, Science Press. All right reserved.

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