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Yu R.,Nanjing University of Finance and Economics | Wang G.-X.,Nanjing University of Finance and Economics | Zheng J.-Y.,Jiangsu Province Institute of Quality and Safety Engineering | Zheng J.-Y.,Nanjing Southeast University | Wang H.-Y.,Jiangsu Province Institute of Quality and Safety Engineering
Jiaotong Yunshu Xitong Gongcheng Yu Xinxi/Journal of Transportation Systems Engineering and Information Technology | Year: 2013

As an important part of the modern intelligent transportation system, urban transport condition recognition is the base of intelligent control, guidance and synergy system. This paper establishes a three-dimensional space with traffic volume, average speed and occupation ratio. It then classifies transportation condition patterns in terms of blocking flow, crowded flow, steady flow and unhindered flow based on wide literature review. Furthermore, this paper presents the algorithm with the MATALB LiBSVM toolbox. To process the data, this paper compares the classification result of different SVM kernel functions and thus realizes the transport condition pattern recognition via the support vector machine (SVM). The results reveal that the selected indexes effectively reflect the characteristics of the traffic conditions. The SVM kernel function can separate different patterns from traffic flows with high classification accuracy, and the data normalization has a significant influence on the result of classification. Copyright © 2011 by Science Press.


Wang H.,Nanjing University | Wang H.,Jiangsu Province Institute of Quality and Safety Engineering | Peng J.,Jiangsu Province Institute of Quality and Safety Engineering | Peng J.,Nanjing University of Finance and Economics | And 3 more authors.
Acta Chimica Sinica | Year: 2012

A novel chiral stationary phase was synthesized via the combination of atom transfer radical polymerization (ATRP) and click chemistry. In the synthesis, the silane coupling agent 3-(2-bromoisobutyryl)-propyl triethoxysilane (BPE) was chosen as the ATRP initiator and immobized on the porous silica gel. The polymer chains of poly(2-methyl-3-butyn-2-ol methacrylate) (pMBMA) were grafted on the silica substrates by surface-initiated ATRP. This "grafting-from" technique was used to synthesize polymers with controllable molecular weight and narrow molecular weight distributions. For immobilizing the chiral selector, azide-modified β-cyclodextrin (β-CD) was synthesized and bounded on the pMBMA by click chemistry, which can avoid the side-reactions in the preparation. The materials with different pMBMA chain density and length on the silica gel surface were prepared. Several pharmaceuticals were used to evaluate the enantioseparation ability of the materials under reversed-phase high performance liquid chromatography. The results demonstrate that ATRP can well design the polymer structure, and click chemistry can provide an effective route in the β-CD immobilization for chiral discrimination. It was found that the retention and separation factors of chiral compounds could be improved by adjusting the pMBMA chain density and length on the surface of silica gel.


Meng X.-L.,Nanjing University of Finance and Economics | Wang H.-Y.,Jiangsu Province Institute of Quality and Safety Engineering | Tang R.,Jiangsu Province Institute of Quality and Safety Engineering | Yin X.-H.,Nanjing University of Finance and Economics
Xitong Gongcheng Lilun yu Shijian/System Engineering Theory and Practice | Year: 2014

For conflict problem on multi-agent collaboration of food quality chain, a method on conflict resolution is proposed based on negotiation. Firstly, essence of quality chain conflict is defined mathematically based on Pareto optimum solution. Secondly, profit models for food manufacturer, food supplier and food quality chain are proposed fully considering characteristic of food quality chain. Thirdly, procedure parameters for bargaining between both sides in conflict are determined as follows: quality level provided by food supplier, and the level of quality testing provided by food manufacturer according to cost and quality level of the other side. Negotiation procedure is constructed according to the goal of maximizing profits for both sides. Finally, an illustrative example for quality chain of dairy products is given. The results indicate that, not only each enterprise member but also the whole quality chain gains the greatest profits using the proposed negotiation strategy, thereby solving conflict of food quality chain and improving quality level of food quality chain. ©, 2014, Systems Engineering Society of China. All right reserved.


Zhang Z.-Y.,Nanjing University of Finance and Economics | Zhang Z.-Y.,Jiangsu Province Institute of Quality and Safety Engineering | Liu J.,Nanjing University of Finance and Economics | Liu J.,Jiangsu Province Institute of Quality and Safety Engineering | And 2 more authors.
Analytical Letters | Year: 2015

A simple integrated agarose microchip-based substrate is reported for surface enhanced Raman spectroscopy. The substrate was evaluated for the determination of sodium thiocyanate in milk. The limit of detection was 5 × 10−7 grams per milliliter. The microarray design allowed the synchronous processing of many samples. The reported procedure is green and practical for on-site determination of sodium thiocyanate in milk with potential for additional applications. © 2015, Copyright © Taylor & Francis Group, LLC.


Zhu X.,CAS Institute of Policy and Management | Zhu X.,University of Chinese Academy of Sciences | Li J.,CAS Institute of Policy and Management | Wu D.,CAS Institute of Policy and Management | And 3 more authors.
Knowledge-Based Systems | Year: 2013

Accuracy, complexity and interpretability are very important in credit classification. However, most approaches cannot perform well in all the three aspects simultaneously. The objective of this study is to put forward a classification approach named C-TOPSIS that can balance the three aspects well. C-TOPSIS is based on the rationale of TOPSIS (Technique for Order Preference by Similarity to Ideal Solution). TOPSIS is famous for reliable evaluation results and quick computing process and it is easy to understand and use. However, it is a ranking approach and three challenges have to be faced for modifying TOPSIS into a classification approach. C-TOPSIS works out three strategies to overcome the challenges and retains the advantages of TOPSIS. So C-TOPSIS is deduced to have reliable classification results, high computational efficiency and ease of use and understanding. Our findings in the experiment verify the advantages of C-TOPSIS. In comparison with 7 popular approaches on 2 widely used UCI credit datasets, C-TOPSIS ranks 2nd in accuracy, 1st in complexity and is in 1st rank in interpretability. Only C-TOPSIS ranks among the top 3 in all the three aspects, which verifies that C-TOPSIS can balance accuracy, complexity and interpretability well. © 2013 Elsevier B.V. All rights reserved.


Xie Y.,CAS Dalian Institute of Chemical Physics | Xie Y.,University of Chinese Academy of Sciences | Chen P.,CAS Dalian Institute of Chemical Physics | Hua L.,CAS Dalian Institute of Chemical Physics | And 4 more authors.
Journal of the American Society for Mass Spectrometry | Year: 2016

The specific locations of the double bonds in linear olefins can facilitate olefin catalytic synthetic reactions to improve the quality of target olefin products. We developed a simple and efficient approach based on single photon ionization time-of-flight mass spectrometry (SPI-TOFMS) combined with online ozonolysis to identify and quantify the linear olefin double bond positional isomers. The online ozonolysis cleaved the olefins at the double bond positions that led to formation of corresponding characteristic aldehydes. The aldehydes were then detected by SPI-TOFMS to achieve unique spectrometric "fingerprints" for each linear olefin to successfully identify the isomeric ones. To accurately quantify the isomeric components in olefin mixtures, an algorithm was proposed to quantify three isomeric olefin mixtures based on characteristic ion intensities and their equivalent ionization coefficients. The relative concentration errors for the olefin components were lower than 2.5% while the total analysis time was less than 2 min. These results demonstrate that the online ozonolysis SPI-TOFMS has the potential for real-time monitoring of catalytic olefin synthetic reactions. © 2015 American Society for Mass Spectrometry.


PubMed | Jiangsu Province Institute of Quality and Safety Engineering and CAS Dalian Institute of Chemical Physics
Type: Journal Article | Journal: Journal of the American Society for Mass Spectrometry | Year: 2015

The specific locations of the double bonds in linear olefins can facilitate olefin catalytic synthetic reactions to improve the quality of target olefin products. We developed a simple and efficient approach based on single photon ionization time-of-flight mass spectrometry (SPI-TOFMS) combined with online ozonolysis to identify and quantify the linear olefin double bond positional isomers. The online ozonolysis cleaved the olefins at the double bond positions that led to formation of corresponding characteristic aldehydes. The aldehydes were then detected by SPI-TOFMS to achieve unique spectrometric fingerprints for each linear olefin to successfully identify the isomeric ones. To accurately quantify the isomeric components in olefin mixtures, an algorithm was proposed to quantify three isomeric olefin mixtures based on characteristic ion intensities and their equivalent ionization coefficients. The relative concentration errors for the olefin components were lower than 2.5% while the total analysis time was less than 2 min. These results demonstrate that the online ozonolysis SPI-TOFMS has the potential for real-time monitoring of catalytic olefin synthetic reactions.


PubMed | Jiangsu Province Institute of Quality and Safety Engineering and CAS Dalian Institute of Chemical Physics
Type: | Journal: Scientific reports | Year: 2015

Ion mobility spectrometer (IMS) has been widely deployed for on-site detection of explosives. The common nitro-based explosives are usually detected by negative IMS while the emerging peroxide-based explosives are better detected by positive IMS. In this study, a fast polarity-switchable IMS was constructed to detect these two explosive species in a single measurement. As the large traditional Faraday detector would cause a trailing reactant ion peak (RIP), a Faraday detector with ion focusing in vicinity was developed by reducing the detector radius to 3.3mm and increasing the voltage difference between aperture grid and its front guard ring to 591V, which could remove trailing peaks from RIP without loss of signal intensity. This fast polarity-switchable IMS with ion focusing in vicinity of Faraday detector was employed to detect a mixture of 10ng 2,4,6-trinitrotoluene (TNT) and 50ng hexamethylene triperoxide diamine (HMTD) by polarity-switching, and the result suggested that [TNT-H](-) and [HMTD+H](+) could be detected in a single measurement. Furthermore, the removal of trailing peaks from RIP by the Faraday detector with ion focusing in vicinity also promised the accurate identification of KClO4, KNO3 and S in common inorganic explosives, whose product ion peaks were fairly adjacent to RIP.


Liu L.,Nanjing University of Science and Technology | Zhu C.,Nanjing University of Science and Technology | Fan M.,Nanjing University of Science and Technology | Chen C.,Nanjing University of Science and Technology | And 5 more authors.
Nanoscale | Year: 2015

Nowadays, biologically oxidizing graphitic materials is of great importance for practical applications as an eco-friendly and low-cost method. In this work, a bacterial strain is isolated from the contaminated soil in a graphite mine and its ability to oxidize graphite, graphene oxide (GO) and reduced graphene oxide (RGO) is confirmed. After being cultivated with bacteria, graphite is inhomogeneously oxidized, and moreover oxidized sheets exfoliated from graphite are detected in the medium. RGO shows a higher degree of oxidation compared to graphite owing to more original defects, while GO breaks into small pieces and becomes full of holes. Both the holes in GO and the exfoliated sheets from graphite caused by bacteria have a size of below 1 μm, in agreement with the size of bacterial cells. Besides, the preliminary mechanism of the bacterial oxidation is explored, suggesting that the contact between bacterial cells and materials promotes the oxidation of graphitic materials. The ability of naphthalene-degrading bacteria to oxidize and degrade the graphitic materials shows the potential for producing GO in an eco-friendly way and degrading carbon nanomaterials in the environment. This journal is © The Royal Society of Chemistry.


Wang H.,Nanjing University | Xie Q.,Jiangsu Province Institute of Quality and Safety Engineering | Jiang A.,Jiangsu Province Institute of Quality and Safety Engineering | Peng J.,Jiangsu Province Institute of Quality and Safety Engineering
Chromatographia | Year: 2013

A "comb-like" chiral stationary phase was developed using surface-initiated technique via atom transfer radical polymerization (ATRP). Chlorinated silica gel was produced as the ATRP initiator in a one-step reaction with thionyl chloride. This initiation method results in a hydrolytically stable initial Si-C bond for poly(glycidyl methacrylate) (pGMA) chains grafted on the surface of silica gel. β-Cyclodextrin (β-CD) was immobilized on the pGMA chains with ring opening reaction to prepare the chiral stationary phase. This "comb-like" chiral stationary phase with the different pGMA chain length was evaluated by enatioseparation of structurally diverse racemic compounds under reversed-phase high-performance liquid chromatography. The chromatographic results demonstrate the effective chiral separation ability of the new chiral stationary phase. © 2013 Springer-Verlag Berlin Heidelberg.

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