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Tourism utilization is an important means for revitalizing canal heritage. Exploring the utilization models of canal heritage tourism is the prerequisite to realizing the sustainable development of canals. Based on previous studies, this study defines two important models of community concentration and corridor expansion. Through an empirical comparison of the Old City section and the Tongzhou section along the Grand Canal in Beijing, this study systematically explores the theoretical mechanism and law of the differences between the two models of tourism utilization. Utilizing a collection of the literature, field investigations, and in-depth interview data and using the theory of a figure-ground relationship, this study discusses the characteristics of the two models of canal heritage tourism utilization and the reasons for their differences. The results reveal that community-concentrated and corridor-expanded models show great differences in the development process, heritage and tourism resources, and spatial organization. The formation of the differences results from location, economic, cultural, ecological, and accidental factors as the driving forces and the continuous self-adjustment of the areas along the canal. This study provides theoretical constructs and policy recommendations for optimization and sustainable canal heritage development. [ABSTRACT FROM AUTHOR]

For problems of existing discrimination methods of water inrush source based on hydrochemical characteristics such as complex process, difficulty to distinguish single water inrush point, neglecting the correlation among hydrochemical characteristics, large calculation amount and so on, a discrimination method of mine water inrush source based on Bayes-extension discrimination method was proposed combining with Bayes discrimination method and extension discrimination method. Twenty-six groups of water samples from different aquifers and four groups of water samples to be judged in Pa'er Coal Mine are obtained, the content of SO2-4, Cl-, HCO-3, K++Na+, Mg2+, Ca2+ in the water samples is taken as hydrochemical characteristic indexes, and thus matter-element models of the water samples are established. The correlation degrees between the water samples to be judged and the known water samples are obtained by use of extension discriminant method. The miscalculation loss of Bayes discriminant method and density function of the water samples to be judged with the known water samples are combined to get Bayes-extension solutions. The type of water inrush sample is discriminated according to the minimum value of Bayes-extension solutions. Piper trilinear diagram, extension discriminant method and Bayes-extension discriminant method are adopted separately to discriminate the type of mine water inrush samples. The results show that Piper trilinear diagram is difficult to accurately discriminate a certain type of water samples, extension discriminant method has misjudgment, while Bayes-extension discriminant method can accurately discriminate the type of water inrush sample.

This study was to explore the functional mechanism of rare earth regulating soybean leaves and the characteristics and functions of differentially expressed proteins under the regulation of rare earth. In this study, Dongnong 42 was used as material, and 30 mg ⋅ L-1 CeCl3 solution was sprayed on soybean leaves at the seedling stage. Tandem mass tag (TMT) quantitative proteomics technique and bioinformatics analysis were used to identify soybean leaf proteins. A total of 8 510 proteins were identified, and 127 differentially expressed proteins (DEPs) in response to rare earth cerium regulation were identified, among which 64 were upregulated and 63 were down-regulated. The gene ontology (GO) annotation indicated that DEPs were mainly involved in metabolic process, cellular process, response to stimulus, biological regulation, and response to a stimulus; DEPs in cell module categories were mainly involved in cells, cell part, organelle, membrane, membrane part, organelle par, and protein-containing complex; DEPs in molecular functional categories were mainly involved in catalytic activity, binding and antioxidant activity. Kyoto encyclopedia of genes and genomes (KEGG) pathway significantly enriched starch and sucrose metabolism, glycolysis/gluconeogenesis, galactose metabolism, pentose phosphate pathway, and MAPK signaling pathway-plant. These DEPs were mainly involved in photosynthesis, glucose metabolism and stress response. Forty-six differential protein interaction networks were identified by protein interaction network analysis. This experiment provided a reference for studies of the mechanism of rare earth cerium regulating soybean leaf function from the proteomic perspective. [ABSTRACT FROM AUTHOR]