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He R.,West Anhui University
Quantum Information Processing | Year: 2015

A new algorithm is put forward to calculate the covariance matrix of an arbitrary form of Gaussian state. Through this algorithm, we find the correlation between operator correlation matrix Ω and covariance matrix V while Ω can be provided by using IWOP technique in general. As an application of the algorithm, we give the covariance matrix of n-mode squeezed state successfully. © 2015, Springer Science+Business Media New York.

Xie C.,West Anhui University | Li H.,West Anhui University | Li S.,West Anhui University | Wu J.,West Anhui University | Zhang Z.,Chinese Academy of Sciences
Analytical Chemistry | Year: 2010

This paper reports a surface molecular self-assembly strategy for molecular imprinting in electropolymerized polyaminothiophenol (PATP) membranes at the surface of gold nanoparticles (AuNPs) modified glassy carbon (gc) electrode for the electrochemical detection of pesticide chlorpyrifos (CPF). Electropolmerizable p-aminothiophenol (ATP) was first assembled on the AuNPs at the gc electrode surface by the formation of Au-S bonds, and subsequently, the CPF template was further assembled onto the monolayer of ATP through the hydrogen-bonding interaction between amino group and CPF. A conductive hybrid membrane was fabricated at the assembled gc electrode by the electropolymerization in a mixing solution containing additional ATP and CPFtemplates, and meanwhile, the CPF was spontaneously imprinted into the PATP/AuNP film. The amount of imprinted sites at the PATP/AuNP film was significantly increased due to the additional replenishment of CPF templates. The cyclic voltammetric response of the imprinted PATP-AuNP-gc sensor to CPF is about 3.2-fold as compared with the imprinted PATP-Au sensor, and the detection limit for CPF is about 2 orders of magnitude lower than that by the imprinted PATP-Au sensor. An excellent electrochemical selectivity for CPF over other pesticides was also achieved. The combination of surface molecular selfassembly with electropolymerized molecular imprinting on a larger surface area of a AuNP-modified electrode produces a high ratio of imprinted sites and, thus, provides an ultrasensitive electrochemical detection of organophosphate pesticide. © 2010 American Chemical Society.

Hu L.,West Anhui University | Yan Z.,West Anhui University | Yan Z.,Donghua University | Xu H.,Donghua University
RSC Advances | Year: 2013

Due to the specially rigid, planar and zwitterionic structures, squaraine dyes have strong absorption (ε ≥ 105 L mol-1 cm-1) in the visible to near-infrared region. Therefore, squaraine dyes have been extensively investigated from both fundamental and technological viewpoints. To present the readers a better understanding of the important dyes, in this article, we will highlight the recent synthetic developments of squaraine derivatives as a class of functional near infrared absorbing optic materials and their application in the areas of anti-aggregation, sensor, solar cell, nonlinear optics and self-assembly functional materials based on our own work during the recent years. © 2013 The Royal Society of Chemistry.

Wu Z.,West Anhui University
Romanian Review Precision Mechanics, Optics and Mechatronics | Year: 2016

Characterized by compact structure, large workspace and good flexibility, the series robots are widely used in the aided process of manufacturing. Based on the principle of centralized process, the bearing rings are made by means of lathe work by biaxial computer numerical control (CNC) machine tools. However, there were concerns about the difficulty in applying the biaxial synchronous docking technology and the high expense on equipments. The study was aimed at a research on the mechanism design and optimization of a kind of special clamping manipulator, which could replace the existing biaxial docking process. Firstly, the study analyzed the turning processing craft of bearing rings dual-axis CNC machine tools and proposed the function and performance design requirements of clamping manipulators. Secondly, forward kinematics models of clamping manipulators were established based on the D-H method. Thirdly, there was a detailed analysis of the main cross-sectional shape of clamping manipulator’s workspace based on graphic method; furthermore, we analyzed the capacity of clamping manipulators to contain cuboids. On this account, an overall analysis was given about the influence that the space and structure parameters had on the serial robot manipulators. © 2011 INCDMTM.

Li H.,West Anhui University | Xie C.,West Anhui University | Fu X.,West Anhui University
Sensors and Actuators, B: Chemical | Year: 2013

We report on the use of core-shell imprinted nanoparticles for the selective recognition of thifensulfuron-methyl (TFM) using an electrochemiluminescence (ECL) method. The core-shell imprinted nanoparticles were first prepared by a surface monomer-directing strategy for imprinting TFM at the surface of 3-methacryloxypropyl trimethoxysilane modified silica particles. Then, the ECL sensor was prepared by depositing the core-shell imprinted nanoparticles/chitosan composite film on the bare glassy carbon electrode surface and further removing silica cores from the composite film. The electrochemical and ECL behaviors of luminol at the sensor were investigated in the absence and presence of TFM. It was also found that the ECL intensity could be strikingly enhanced by the adsorbed TFM molecules in the composite film, which was about 2.7-fold as compared with the blank ECL intensity. On this basis, an enhanced ECL sensor is established for high sensitive and selective detection of TFM. The resulting ECL sensor shows wide linear ranges from 5.0 × 10-10 to 1.0 × 10-7 M with lower detection limit of 0.32 nM for TFM. Moreover, the ECL sensor has the advantages of high sensitivity, speed, specificity, and stability and could become a promising technique for sulfonylurea herbicide detection. © 2013 Elsevier B.V.

Li H.-F.,West Anhui University | Xie C.-G.,West Anhui University
Journal of Luminescence | Year: 2012

In acidic medium, the oxidation reaction of cerium (IV) with iodide can produce strong chemiluminescence (CL) in the presence of surfactant tween 40 as an enhancer. On this basis, a flow injection method with CL detection was established for the determination of iodide. The method is simple, rapid and effective to determine iodide in the range of 8.0×10-85. 0×10-5 mol/L with a determination limit of 5.0×10 -8 mol/L. The relative standard deviation is 2.7% for the determination of 5.0×10-6 mol/L iodide (n=11). The method has been applied to determine the content of iodide in urine with satisfactory results. Furthermore, it is suggested that the light emission from cerium (IV)tween 40 reaction is probably because of the formation of singlet oxygen 1O2 and the emitter is excited oxygen molecular pairs O2(1Δg)O2(1∑ g -). © 2011 Elsevier B.V. All rights reserved.

Li H.,West Anhui University | Xie C.,West Anhui University | Li S.,West Anhui University | Xu K.,West Anhui University
Colloids and Surfaces B: Biointerfaces | Year: 2012

An electrochemical sensor for pesticide triazophos (TAP) was prepared by deposition of gold nanoparticles (AuNPs) on carbon nanotubes (CNTs) modified glassy carbon (GC) electrode surface using a potentiostatic method, followed by electropolymerizing of o-hydroxyphenol at the AuNP/CNT/GC electrode surface in the presence of template triazophos via cyclic voltammetry. The electrochemical response of triazophos at the TAP-imprinted polyhydroxyphenol (PHP) modified AuNP/CNT/GC (PHP/AuNP/CNT/GC) electrode was investigated by cyclic voltammetry. The cyclic voltammetric response of triazophos at the TAP-imprinted PHP/AuNP/CNT/GC electrode was significantly higher than that at bare GC, CNT/GC, AuNP/CNT/GC, imprinted PHP/CNT/GC and non-imprinted PHP/AuNP/CNT/GC electrodes. The results indicated that the TAP-imprinted PHP/AuNP/CNT/GC electrode can effectively improve the reductive properties of triazophos and eliminate interferences of other pesticides. In addition, the AuNPs can strikingly amplify the electrochemical response of triazophos and improve the sensitivity to triazophos. Finally, the electrochemical sensor was successfully applied to determination of triazophos in vegetable samples with satisfactory results. © 2011 Elsevier B.V.

Xu S.,West Anhui University
WIT Transactions on Information and Communication Technologies | Year: 2014

The researchers inevitably need to judge the type of the indicators in the application of entropy evaluation model. This paper finds that some factors are uncertain on the influence of disclosure quality of listed company by reviewing the literature. Hence, the researchers may get false choice between positive indicator and negative indicator in the application. The false choice may reduce the accuracy of the evaluation conclusion. To demonstrate this judgement, this paper firstly chooses five factors based on China National Knowledge Infrastructure Database to form three indicator groups. The indicator whose type is more deterministic in the theoretical analysis and empirical result is added earlier. Secondly this paper adds controversial indicator gradually into entropy evaluation model, finally analyses the consistency between evaluation value and the rating of the Shenzhen Stock Exchange. The empirical conclusion shows the uncertainty of the indicator reduces the accuracy of the evaluation conclusion based on entropy evaluation model. © 2014 WIT Press.

Xie C.-G.,West Anhui University | Li H.-F.,West Anhui University
Luminescence | Year: 2010

The oxidation reaction of H2O2 with KIO4 can produce chemiluminescence (CL) in the presence of the surfactant Tween40 and the CL intensity of the CL system KIO4-H2O2-Tween40 can be strikingly enhanced after injection of tannic acid. On this basis, a flow injection method with CL detection was established for the determination of tannic acid. The method is simple, rapid and effective to determine tannic acid in the range of 7.0 × 10-9 to 1.0 × 10-5 mol/L with a determination limit of 2.3 × 10-9 mol/L. The relative standard deviation is 2.6% for the determination of 5.0 × 10-6mol/L tannic acid (n = 11). The method has been applied to determine the content of tannic acid in industrial wastewater with satisfactory results. It is believed that the CL reaction formed singlet oxygen 1O2* and the emission was from an excited oxygen molecular pair O2(1Δg)O2(1∑- g) in the KIO4-H2O2-Tween40 reaction. Tween40 played an important role in enhancing stabilization of the excited oxygen molecular pair O2(1Δg)O2(1∑- g) and in increasing CL intensity. © 2010 John Wiley & Sons, Ltd.

Qiao D.L.,West Anhui University
Zhong yao cai = Zhongyaocai = Journal of Chinese medicinal materials | Year: 2012

To optimize ultrasonic-assisted extraction parameters of polysaccharides from Agaricus bisporus and evaluate antioxidant activities of A. bisporus polysaccharides. Polysaccharides from A. bisporus was extracted by using methods of ultrasonic-assisted hot water lixiviation, ethanol precipitation, Sevag's deproteination and ethanol precipitation again. Extraction temperature, extraction time, ratio of water to raw material and ultrasonic power were selected in single-factor tests. Based on the single-factor tests, parameters combination for the ultrasonic-assisted extraction of A. bisporus polysaccharides was optimized by using four-factor-three-level orthogonal test. Antioxidant activities (reductive potential, superoxide anion scavenging activity and H2O2 scavenging activity) of A. bisporus polysaccharides were evaluated in vitro. Optimum conditions for the extracting of A. bisporus polysaccharides were extracting temperature 65 degrees C, extracting time 40 min, ratio of water to raw material 30 mL/g and ultrasonic power 170 w. Practicing this optimal condition, extraction yield of polysaccharides from A. bisporus was 5.6 014%. In crude polysaccharides of A. bisporus, carbohydrates content, determined by applying the phenol-sulfuric acid method, was 75.48%. Polysaccharides of A. bisporus could reduce ferric ion, scavenge superoxide anion and hydrogen peroxide in a dose-dependent manner. Utrasonic-assisted extraction could be used in the extracting of A. bisporus polysaccharides. Polysaccharides of A. bisporus, had direct and potent antioxidant activities, might be developed and utilized as natural antioxidant.

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