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Eight secondary metabolites, including a new polyketide, named asperetide (1) and a new prenylxanthone derivative, called asperanthone (4), and six known compounds, (S)‐3‐butyl‐7‐methoxyphthalide (2), ruguloxanthone C (3), tajixanthone hydrate (5), tajixanthone methanoate (6), salimyxin B (7), and ergosterol (8), were isolated and identified from the medicinal plant‐derived fungus, Aspergillus sp...
Ice-jammed flood severely imperil the safety of people's life and property, which lives alongside the Yellow River. Using GPR and unmanned helicopter can get the spatial distribution of ice layer thickness, and provide the important investigation parameter of ice-jammed flood prevention and the best position for bombing the ice. This paper presents the compose of ice-jammed flood prevention GPR system...
Based on a new variational-based model within the fuzzy framework, we propose a new solution to the problem of multi-region segmentation of natural images. The advantages of our model is: by introducing the PCA features and modeling regions by Gaussian distribution, the proposed model can partition texture images better than classical variational-based segmentation models. We use the Berkeley database(BSDS300)...
Numerous web crawlers especially impolite crawlers visit websites to get contents every day, which yields higher access frequency than the websites can hold. The big traffic of impolite crawlers causes a strong hazard on analysis of normal users and advertisement income. In this paper, we present a method to detect impolite crawlers by using time series analysis. This method is applied to real data...
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