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Xin Q.,Yili Normal University | Zhang X.,Yili Vocational and Technical College | Xu L.,Yili Normal University
Journal of Computational Information Systems | Year: 2013

In this paper, we study the nonlocal p-Laplacian evolution equation with a nonlinear reaction term for the bimodal image segmentation. And then, we give an effective algorithm to compute the solution. Finally, we include some numerical experiments for a synthetic example and some natural images, which illustrate our model's capability. The comparison of the computing time with the local model for different images are also proposed. © 2013 Binary Information Press.


Xu M.-H.,Taiyuan Normal University | Liu M.,Taiyuan Normal University | Xue X.,CAS Lanzhou Cold and Arid Regions Environmental and Engineering Research Institute | Zhai D.-T.,Taiyuan Normal University | And 3 more authors.
Chinese Journal of Ecology | Year: 2015

Alpine meadow in China is degrading, seriously influencing species diversity and biomass production of vegetation. In this study, we chose a typical alpine meadow in Qinghai-Tibe-tan Plateau as a model system by establishing four treatments, including control (CK), 3-year warming (W), 2-year clipping (C), and 3-year warming + 2-year clipping (WC). The experiment followed a randomized block design consisting of five replications. We measured species diversity (Margalef index, Shannon index, Simpson index and Pielou index) and belowground biomass of the vegetation in all treatments during the growing season of 2012 and 2013. The aim of this study was to assess the effects of warming and clipping on plant species diversity and below-ground biomass. The results showed that: (1) Species diversity was significantly higher in the middle growing season (from June to August) than in the early (May) and late (September) growing season. (2) The response of species diversity was not sensitive to 3-year warming and 2-year clipping, and species diversity was slightly increased in the W and C treatments while slightly decreased in the WC treatment. (3) Warming and clipping tended to increase vegetation be-lowground biomass and caused the variation of allocation pattern of belowground biomass across different soil layers. Clipping had significant effects on biomass in the 0-30 cm soil layer, whereas warming had significant effects on biomass in the 30-50 cm soil layer. © 2015, Editorial Board of Chinese Journal of Ecology. All rights reserved.


Li D.,Shihezi University | Li D.,Xinjiang Agricultural University | Shang J.,Yili Vocational and Technical College | Ma X.,Shihezi University | And 2 more authors.
Journal of the Chemical Society of Pakistan | Year: 2013

A Box-Behnken design was employed to study the combined effects of variables of microwave-assisted extraction on pectin from sugar beet pulp. The independent variables were time and power of microwave-assisted extraction, pH of sulfuric acid and rate of solid to liquid (SLR). The combined effects of these variables on degree of esterification (DE) were studied. Results have shown that the generated regression model significantly explained the actual relationship between the independent variables and response. Besides that, pH was the most important variable which affected the DE. Higher acid concentration, extraction power and longer extraction time increased the DE of pectin due to Esterification. Through the response surface, the satisfactory conditions for extraction of high-ester sugar beet pulp pectin were obtained as follows: 1.02 of pH, 3.96 min of extraction time, 193.68W of power and 19.98 of SLR.


Jiang L.,Shihezi University | Jiang L.,Yili Vocational and Technical College | Jiang L.,Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bintuan | Shang J.,Yili Vocational and Technical College | And 3 more authors.
Advanced Materials Research | Year: 2012

The extraction of pectin from seed watermelon peel could reduce environmental problem and offer a way to upgrade byproducts. In this study, variables of microwave-assisted extraction (MAE) and conventional heating extraction (CHE) were tested in order to recovery pectin from seed watermelon peel. After the test of single factor experiments, orthogonal experiments were employed to obtain optimum conditions for pectin extraction from seed watermelon peel. The satisfactory conditions for MAE were as follows: power of 500W, pH of 1.5, time of 7min and SLR of 1:20, and the optimum CHE conditions were temperature of 90°C, pH of 1.0, time of 150min and SLR of 1:20. Proof tests were replicated three times and the products were characterized of their qualitative and quantitative characteristics. The yield of 17.4-17.6%, ash content of 1.6-1.9%, GalA content of 78.3-82.8%, DE of 38.2-41.2% and molecular weight of 110600-128000 of pectin extracted by CHE were obtained. The pectin extracted by MAE achieved a higher yield (19.1-19.6%), and has a higher content of DE (44.3-48.7%), higher molecular weight (143400-154300), lower content of GalA (74.6-76.1%), and almost equal ash content (average value of 1.7% and 1.6%, respectively). © (2012) Trans Tech Publications, Switzerland.

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