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The influence of X-ray wavelength and the simulative human skin and muscle obstruction on the detection of human body-hidden drugs by non-intrusive X-ray diffraction method

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Procedia Engineering 2010年 7卷 195-202页

作者： Bai Sun Minqiang Li Fang Zhang Yu Zhong Daoyang Yu Wei Lu Guoqiang Pan Jinhuai Liu The Key Laboratory of Biomimetic Sensing and Advanced Robot Technology Anhui Province Institute of Intelligent Machines Chinese Academy of Sciences Hefei 230031 PR China National Synchrotron Radiation Laboratory University of Science and Technology of China Hefei 230029 PR China

In order to detect the body-hidden drugs non-intrusively and rapidly, the influence of the X-ray wavelength and covering of the simulative skin and muscle on the detection of methamphetamine sample by synchrotron radiation X-ray diffraction (SR-XRD) technique have been investigated. Synchrotron radiation based X-ray with three different wavelengths (1.29 Å, 1.54 Å, 1.80 Å) has been chosen as the X-ray source. The results indicate that the intensities as well as the number of the diffraction peaks of methamphetamine sample covered by simulative muscle decreased with the increasing of the X-ray wavelength from 1.29 Åto 1.80 Å. In addition, the intensities of the diffraction peaks for methamphetamine will be seriously affected by the covered simulative skin or muscle due to the X-ray absorption. Furthermore, the absorption of X-ray by the simulative muscle seems much stronger than that of the simulative skin. Moreover, the specific molecular structure of the methamphetamine sample has been obtained by X-ray diffraction method.

关键词： Drug detection SR-XRD Methamphetamine Molecular structure

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Identification of liquid materials using energy dispersive X-ray scattering

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Procedia Engineering 2010年 7卷 135-142页

作者： Yu Zhong Bai Sun Daoyang Yu Wei Li Yu Zhang Minqiang Li Jinhuai Liu Key Laboratory of Biomimetric Sensing and Advanced Robot Technology Institute of Intelligent Machines Chinese Academy of Sciences Hefei 230031 PR China Anhui Provincial Laboratory of Biomimetic Sensor and Detecting Technology West Anhui University Anhui Lu’an 237012 237012 PR China

Energy dispersive X-ray scattering (EDXRS) has been successfully applied for the identification of liquid materials for the first time. Three liquid systems of primary alcohols, ketones compounds and acids are carefully investigation and the scattering spectra are described. Based on structural and compositional differences of compounds, the scattering profiles of all samples exhibit characteristic shapes, indicating that EDXRS profile is unique to each specific liquid material. These findings imply that EDXRS would be promisingly applied as a non-invasive inspection for liquid identification.

关键词： Liquid materials Energy dispersive X-ray scattering Detection Identification

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Notice of Retraction: A Dynamic Simulation of Force in the Movement of Ameba Based on Cosmos

Notice of Retraction: A Dynamic Simulation of Force in the M...

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International Conference on Modeling, Simulation and Visualization Methods (WMSVM)

作者： Lei Chen Minzhou Luo Tao Mei Precision Machinery and Precision Instrumentation University of Science and Technology Hefei China Key Laboratory of Biomimetic Sensing and Advanced Robot Technology Hefei Institute of Intelligent Machines Chinese Academy and Sciences Hefei China

This article has been retracted by the publisher.

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Synchrotron radiation circular dichroism: a new tool for identification of point-mutation protein

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Procedia Engineering 2010年 7卷 143-146页

作者： Honglin Liu Shiqiang Wei Ye Tao Liangbao Yang Jinhuai Liu The Key Laboratory of Biomimetic Sensing and Advanced Robot Technology Anhui Province Institute of Intelligent Machines Chinese Academy of Science Hefei 230031 China National Synchrotron Radiation Laboratory University of Science & Technology of China Hefei 230029 China Institute of High Energy Physics Chinese Academy of Sciences Beijing 100039 China

Many diseases are associated with the mutation of wild-type proteins. Usually, a point mutation can lead to severe clinical outcomes. Few techniques have the ability to detect the minute differences between the wild-type and mutant proteins in solution under near physiological conditions. Circular dichroism (CD) is an established and valuable technique for examining protein structure. Because of its ability to sensitively detect conformational changes, it has important potential for identification of mutant protein. Synchrotron radiation CD (SRCD) offers significant enhancements with respect to conventional CD spectroscopy, which will enable its usage for high-resolution conformation detection and as a tool in the point-mutation protein identification. In this report, SRCD was used, as an example, to identify the point-mutations of human phosphoribosyl pyrophosphate synthetase 1 which were associated with an X chromosome-linked disease.

关键词： Synchrotron radiation circular dichroism Secondary structure Point mutation Phosphoribosyl pyrophosphate synthetase 1

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Energy dispersive X-ray diffraction research using coherence function

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Procedia Engineering 2010年 7卷 165-171页

作者： Daoyang Yu Minqiang Li Wei Li Fang Zhang Bai Sun Jinhuai Liu Key Laboratory of Biomimetric Sensing and Advanced Robot Technology Institute of Intelligent Machines Chinese Academy of Sciences Hefei PR China Department of Automation University of Science and Technology of China Hefei PR China

A method based on energy dispersive X-ray diffraction (EDXRD) spectrum of illicit objects of complex background using coherence function was proposed. After theoretical analysis and calculation of the coherence function, we got the best extracting frequency and the numbers of segment, and the results can also ensure that the requirements of resolution and smoothness. Then, the spectra of EDXRD of several samples of complex background were identified by coherence function, which method has been proved effective and reasonable in identifying the presence of suspicious objects packaged with complex background.

关键词： Identification of illicit objects Energy dispersive X-ray diffraction Coherence function

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Identification of pure liquid precursor chemicals based on coherence function and fourier transform using energy dispersive X-ray diffraction scattering

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Procedia Engineering 2010年 7卷 158-164页

作者： Dingjun Qu Daoyang Yu Wei Li Yu Zhang Bai Sun Yu Zhong Minqiang Li Jinhuai Liu Key Laboratory of Biomimetric Sensing and Advanced Robot Technology Institute of Intelligent Machines Chinese Academy of Sciences Hefei PR China Department of Automation University of Science and Technology of China Hefei PR China

A new method based on Fourier transform and coherence function was used to identify pure liquid precursor chemicals in this paper. Feature scattering spectra of several kinds of pure liquid precursor chemicals were detected through energy-dispersive X-ray scattering (EDXRS). These spectra, each of which was unique to particular liquid in the same case, were processed with coherence function after truncation and wavelet denoising. A suitable frequency was proved useful in calculation of similarity for liquid identification. In this work, the method mentioned above showed to be useful and effective to identify the unknown liquid materials whose samples were saved in the database.

关键词： Precursor chemicals Coherence function Energy-dispersive X-ray scattering Wavelet denoising Fourier transform

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Analysis of skin influence in identification of heroin using singular value decomposition

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Procedia Engineering 2010年 7卷 185-189页

作者： Yu Zhang Minqiang Li Yu Zhong Wei Li Bai Sun Daoyang Yu Jinhuai Liu Department of Automation University of Science and Technology of China Hefei 230027 China Key Laboratory of Biomimetric Sensing and Advanced Robot Technology Institute of Intelligent Machines Chinese Academy of Sciences Hefei China

In this paper, the influence of skin in energy-dispersive X-ray diffraction (EDXRD) spectrum of heroin was studied using singular value decomposition (SVD). The spectra of pure heroin, skin and heroin covered by skin were organized as matrices for SVD after truncation and smoothing. It was demonstrated that the two largest singular values and their corresponding left and right singular vectors of each matrix could reconstruct the matrix in the permissible error and contained enough information of the matrix. We extracted the two largest singular values of each matrix as two dimensions of the feature point of the corresponding spectrum. The feature points of different samples were clustered and a linear relationship was proved to be between and movement of feature point and thickness of component of skin, such as fat and muscle. This indicated that the method of SVD may be suitable for identification of heroin covered by skin.

关键词： Heroin identification Singular value decomposition Energy-dispersive X-ray scattering

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A novel biometrie recognition system based on ground reaction force measurements of continuous gait

A novel biometrie recognition system based on ground reactio...

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Conference on Human System Interactions, HSI

作者： Zhi-Ming Yao Xu Zhou Er-Dong Lin Su Xu Yi-Ning Sun Department of Automation University of Science and Technology Hefei Anhui China The Key Laboratory of Biomimetic Semsing and Advanced Robot Technology Institute of Intelligent Machines Chinese Academy and Sciences Hefei Anhui China

A novel biometric recognition system is designed in this paper, using ground reaction force (GRF) measurements of continuous gait. Original GRF signals are combined in three directions Respectively. Waveform interpolation and align ment are performed to meet th e demand of feature extraction ba sed on wavelet packet (WP) decomposition, re-sampling approach is utilized to expand valid training sets. Features are s elected u sing a fuzzy set-based features election criterion. Classification is accomplished using a kernel-based support vector machine (SVM). The parameter tuning of the S VM classifier is performed using a grid searching method. The approach is tested on a database comprising GRF records obtained from 103 subjects. Comparative results demonstrate that re-sampling approach and waveform interpolation and alignment can improve the recognition accuracy.

关键词： Force measurement Interpolation Support vector machines Support vector machine classification Biometrics Feature extraction Wavelet packets Fuzzy sets Nominations and elections Virtual manufacturing

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Partial least-squares regression for identification of liquid materials

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Procedia Engineering 2010年 7卷 130-134页

作者： Wei Li Yu Zhong Yu Zhang Daoyang Yu Bai Sun Minqiang Li Jinhuai Liu Key Laboratory of Biomimetric Sensing and Advanced Robot Technology Institute of Intelligent Machines Chinese Academy of Sciences Hefei 230031 PR China Department of Automation University of Science and Technology of China Hefei 230031 PR China

Partial least-squares (PLS) regression was demonstrated as a promising suitable method to identify quantitatively liquid materials based on the profile of energy dispersive X-ray scattering spectrum in this paper. Methanol, ethanol, sulfuric acid and acetic acid of different concentrations were measured under conditions of the scatter angle of 7°and the count time of 5 min. The results showed that the regression of concentration was effective. This suggests that PLS can be employed in detecting liquid materials.

关键词： Partial least-squares Energy dispersive X-ray scattering Liquid materials Liquid explosives Precursor chemicals

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Development of a novel H2S gas sensor based on CuO-doped SnO2 hollow nanospheres

Development of a novel H2S gas sensor based on CuO-doped SnO...

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IEEE Sensors 2009 Conference - SENSORS 2009

作者： Liu, Jinhuai He, Lifang Chen, Xing Meng, Fanli Li, Minqiang Key Laboratory of Biomimetic Sensing and Advanced Robot Technology Hefei Institute of IntelligMachines CAS Hefei China

ISBN: (纸本)9781424445486

An effort has been made to develop a kind of CuO-doped SnO2 gas sensors for detecting trace amount of H2S gas at relative low temperature. The CuO-doped SnO2 hollow nanospheres are prepared from SnO2 hollow spheres (employing carbon nanospheres as temples) and Cu precursor by dipping method. The sensitivity and selectivity of the sensors based on the as-prepared CuO-doped SnO2 hollow nanospheres have been studied in details. It had been found that trace amount of H2S gas can be detected by the sensors at a relative low temperature of 35°C. The good sensing performances might be attributed to two factors. Firstly, using SnO2 hollow nanospheres might increase the chances of formation of p-n junctions between CuO nanoparticles and SnO2 nanoparticles. Secondly, the existence of porous structure would improve the active sensing surface area and enhance the efficient gas diffusion. In one word, CuO-doped SnO2 hollow nanospheres might be one of the most promising materials for detecting trace amount of H2S gas. ©2009 IEEE.

关键词： Copper oxides

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