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Adipic acid was synthesized from cyclohexanol oxidized by ACC/silica gel in 89% yield within 3 h at 300C under ultrasound irradiation.

Qiao F.,Hebei University | Qiao F.,Baoding University | Yan H.,Hebei University
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2011

A new molecularly imprinted polymer was synthesized using ofloxacin and theophylline as template and methacryclic acid as function monomer and it was employed as a special dispersant of matrix solid-phase dispersion for selective extraction of fluoroquinolones (ofloxacin, ciprofloxacin and enrofloxacin) and xanthine (caffeine and theophylline) from human serum samples. To eliminate the influences of template leaking on quantitative analysis, acetonitrile-trifluoracetic acid (99:1, v/v) was used as the template removing solution. By using water and acetonitrile-trifluoracetic acid (99.5:0.5, v/v) as the washing and elution solvent, respectively, satisfactory recoveries and clean enough chromatogram could obtained. Good linearity of all the analytes was observed in a range of 0.35-150μgg -1 with the correlation coefficient (r 2)≥0.9991. The recoveries of spiked human serum samples were in a range of 89.5-104.0% for fluoroquinolones and xanthine derivatives with RSD less than of 5.0%. © 2011 Elsevier B.V.

Shen B.,Baoding University
Proceeding of 2012 International Conference on Information Management, Innovation Management and Industrial Engineering, ICIII 2012 | Year: 2012

Since the foreign-related talents in international trade and business are valuable strategic human resource to carry out the Hebei coastal development strategy, It is inevitable request for achieving its development goals to build a high-quality team of talents, and so the research of competency model of the foreign-related talents is very important. This paper collected the data on the competencies of foreign-related talents from 500 foreign-related companies in China via a questionnaire and 10 of them were interviewed face to face. 16 items were extracted from 35 items through the factor analysis, and then the study assumes the structure model by using Structural Equation Model (SEM) method to verify the hypothetical models. Finally the paper not only builds up the structural equation model of foreign-related talents , but also proves the model systematicness by using quantitative methods and researches the relative importance of the competency variables for the model. The paper has an important significance to cultivate the foreign-related talents. ©2012 IEEE.

Lv S.,Capital University of Economics and Business | Lv S.,Baoding University
Procedia Engineering | Year: 2011

The control of blasting ground vibration has been an important research subject in engineering blasting field, and the accurate forecast of blasting vibration is the premise and basis of vibrating control. BP neural network is a neural network model that is most widely used in non-linear forecast. A BP neural network model was established for forecasting the blasting vibration speed. The analyses show that the mean error of blasting vibration speed is 5.7%. As a result, the neural network forecast model obtains higher accuracy, compared with common linear recession method which the mean error is 20.7%. © 2011 Published by Elsevier Ltd.

Qiao F.,Baoding University | Du J.,Chenguang Biotech
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2013

A simple and selective molecularly imprinted matrix solid-phase dispersion (MI-MSPD) method coupled with high performance liquid chromatography (HPLC) ultraviolet detection was developed for rapid screening of clenbuterol hydrochloride (CH) in chicken samples. The new molecularly imprinted microspheres (MIM) were synthesized by using butylamine and chloroaniline as dummy template with aqueous suspension polymerization and revealed good affinity to CH in aqueous solution. The application of the obtained MIM as sorbent of matrix solid-phase dispersion (MSPD) improved the selectivity of extraction procedure and avoided the effect of template leakage on quantitative analysis. Under the optimized conditions, good linearity of CH was obtained in a range of 0.059-18.30μgmL-1 with the correlation coefficient (R) of 0.9996. The recoveries of CH at three spiked levels were ranged from 92.0 to 99.1% with the relative standard deviation less than 4.0% (n=3). The presented MI-MSPD-HPLC method combined the superiority of MIM and MSPD, and therefore could be potentially applied for the determination of CH in complicated biological samples. © 2013 Elsevier B.V.

Liu B.,Hebei University | Yan H.,Hebei University | Qiao F.,Baoding University | Geng Y.,Hebei University
Journal of Chromatography B: Analytical Technologies in the Biomedical and Life Sciences | Year: 2011

A new pretreatment method, solid-phase extraction combined with dispersive liquid-liquid microextration (SPE-DLLME), was proposed in first time for the determination of clenbuterol (CLB) in porcine tissue samples. The tissue samples were firstly extracted by SPE, then its eluents were used as dispersant of the followed DLLME for further purification and enrichment of CLB. Various parameters (such as the type of SPE sorbent, the type and volume of elution solvent, the type and volume of extractant and dispersant, etc.) that affected the efficiency of the two steps were optimized. Good linearity of CLB was ranged from 0.19μg/kg to 192μg/kg with correlation coefficient (r 2) of 0.9995. The limit of detection (LOD) was 0.07μg/kg (S/N=3) and the recoveries at three spiked levels were ranged from 87.9% to 103.6% with the relative standard deviation (RSD) less than 3.9% (n=3). Under the optimized conditions, the enrichment factor (EF) for CLB could up to 62 folds. The presented method that combined the advantages of SPE and DLLME, had higher selectivity than SPE method and was successfully applied to the determination of CLB in tissue samples. © 2010 Elsevier B.V.

Wang W.-L.,Baoding University
Proceedings - International Conference on Machine Learning and Cybernetics | Year: 2015

This paper studies impulsive time-delay control system for a class of difference equations with periodic boundary value conditions. By using some new comparison results and the monotone iterative technique, criteria on the existence of minimal and maximal solutions are obtained. An example is discussed to illustrate the efficiency of the results. © 2014 IEEE.

Zheng Z.,Agricultural University of Hebei | Zhang J.,Baoding University
International Journal of Digital Content Technology and its Applications | Year: 2012

The evaluation of conception design is the focus and difficult point in industrial design, and the quality of the design results is directly 'influenced by this process. In this paper, we investigate the multiple attribute decision making (MADM) problems for for evaluating the industrial design with interval grey linguistic variables. We utilize the interval grey linguistic weighted geometric (IGLWG) operator to aggregate the interval grey linguistic variables corresponding to each alternative and get the overall value of the alternatives, then rank the alternatives and select the most desirable one(s). Finally, an illustrative example for evaluating the industrial design with interval grey linguistic variables is given.

Zhang X.B.,Baoding University
2010 International Conference on Advances in Energy Engineering, ICAEE 2010 | Year: 2010

In china's electricity market, the risk of price fluctuation is significant to grid corporations. A historically reality, the electricity price in market is of gathering effects and heteroscedasticity. Furthermore, the key role of grid corporations in electricity market induces that the same scope of rise and down in price have different impacts on them, which called "lever effect". Based on exponential generalized autoregressive conditional heteroscedasticity and Value-at-Risk theory, we define the risk factor of price fluctuation and establish price risk early-warning model. The empirical analysis demonstrates that the model complements the conventional methods and has high precision. The model can supervise the market price and conduct warning signals. So the grid corporations can take timely countermeasures. © 2010 IEEE.

Qiao F.,Hebei University of Technology | Qiao F.,Baoding University | Sun H.,Hebei University of Technology
Journal of Pharmaceutical and Biomedical Analysis | Year: 2010

An ofloxacin molecularly imprinted polymer was synthesized and used as a dispersant of matrix solid-phase dispersion for the determination of enrofloxacin and ciprofloxacin in chicken tissue. The selected dispersant shows high affinity to enrofloxacin and ciprofloxacin in aqueous environment and could selectively enrich them from chicken tissue matrix. The extract was sufficiently clean for further chromatographic analysis without interferences from template leakage or chicken tissue matrix. Linearity ranged from 0.03 to 200μg/g with the correlation coefficient r2>0.9993. The recoveries of spiked chicken tissues were in the range of 82.7-96.6% for enrofloxacin and 88.7-102% for ciprofloxacin. © 2010 Elsevier B.V.

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