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Your search keyword '"Shi, Yunxia"' showing total 40 results
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40 results on '"Shi, Yunxia"'

9. 2(3),9(10),16(17),23(24)-Octamethoxyphthalocyanine-Cu/CuFe2O4 nanocomposites with enhanced peroxidase-like activity for the sensitive colorimetric determination of glutathione.

Author

Shi, Yunxia, Duan, Hui, Du, Meiyan, Kong, Xia, Xue, Ke, Lu, Guang, and Liu, Qingyun

Subjects
*GLUTATHIONE, *CHROMOGENIC compounds, *PEROXIDASE, *NANOCOMPOSITE materials, *CATALYTIC oxidation, *COPPER, *DETECTION limit
Abstract

In this work, 2(3),9(10),16(17),23(24)-octamethoxyphthalocyanine (Pc(OH)8) was first used to modify Cu/CuFe2O4(Cu/CFO) nanospheres, and Pc(OH)8–Cu/CFO nanocomposites with enhanced peroxidase mimetic enzyme activity was obtained compared to the performance of Cu/CFO alone. SEM, XRD, and XPS were used to study the surface morphology, phase composition and elemental analysis of the newly synthesized Pc(OH)8–Cu/CFO. Using TMB as the chromogenic substrate, Pc(OH)8–Cu/CFO accelerate the oxidation process of chromogenic substrate 3,3′,5,5′- tetramethylbenzidine (TMB) by hydrogen peroxide in three minutes. The catalytic oxidation mechanism of Pc(OH)8–Cu/CFO on TMB was comprehensively investigated through free radical and fluorescence probe experiments. Based on the excellent catalytic performance of the composite materials, a simple and fast colorimetric sensing platform for the colorimetric detection of H2O2 and glutathione (GSH) was constructed in the range of 0.6–5 mM and 2–10 μM with detection limits (LODs) of 0.35 mM and 0.55 μM, respectively. In addition, using Pc(OH)8–Cu/CFO colorimetric detection for GSH has a lower detection limit, good selectivity and high sensitivity, which is expected to become an ideal material for GSH colorimetric detection. [ABSTRACT FROM AUTHOR]

Published
2024
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38. Evaluation on eco-agriculture tourism environmental quality based on neural networks

Author

Shi Yunxia

Subjects
Quality management, Artificial neural network, Computer science, media_common.quotation_subject, Environmental engineering, Quality (business), Environmental economics, Membership function, Backpropagation, Tourism, Environmental quality, Weighting, media_common
Abstract

Tourism environment is the base of the development of tourism industry. The evaluation on the environment quality of tourism destination can maintain and promote the quality of the eco-environment of the tourism destination. In this paper, the evaluation system of eco-agriculture tourism is set up and Neural Networks Method is used for the environmental quality assessment of eco-agriculture tourism The network was chosen as membership function and the standard weighting method was adopted to calculate the weight actor to eliminate the effects of measured concentration It shows that making use of the BP nerve network of method to evaluate touring environmental quality was a scientific and valid method.

Published
2010

40. Main Experience of Ideological & Theoretical Building since Reform & Open.

Author

Shi Yunxia

Abstract

The 30 years history of Reform and Open, in a sense, is the history of arming the Party members with a system of theories with Chinese characteristics. Same as Reform and Open policy, the theoretical armament work innovates and develops unceasingly, and similarly has accumulated rich experience. Summarizing the experiences of arming the Party members with a system of theories with Chinese characteristics conscientiously is not only an important task for the Party's ideological and theoretical building, but also an important part of consolidating and developing Marxist ideology and building Socialism advanced culture. [ABSTRACT FROM AUTHOR]

Published
2008

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