In this paper, we propose a schistosomiasis model in which two human groups share the water contaminated by schistosomiasis and migrate each other. The dynamical behavior of the model is studied. By calculation, the t...In this paper, we propose a schistosomiasis model in which two human groups share the water contaminated by schistosomiasis and migrate each other. The dynamical behavior of the model is studied. By calculation, the threshold value is given, which determines whether the disease will be extinct or not. The existence and global stability of the parasite-free equilibrium and the locally stability of the endemic equilibrium are discussed. Numerical simulations indicate that the diffusion from the mild endemic village to severe endemic village is benefit to control schistosomiasis transmission;otherwise it is bad for the disease control.展开更多
Dewey is a famous American educator,and his Democracy and Education is a complete and systematic theoretical system of education,so it is know as the classics education, progressive education theory of the general pro...Dewey is a famous American educator,and his Democracy and Education is a complete and systematic theoretical system of education,so it is know as the classics education, progressive education theory of the general program.There are many defects and deficiencies in the education of junior middle school in our country,the pragmatism education thought in the book has a great influence on the education of junior middle school in our country,so analysis of the educational thoughts of Dewey's Democracy and Education,such as "child centered theory", "school is society", education is "life", "learn from doing" and so on,this is to improve the history education of junior high school in our country and further promote the education reform of our country has a great positive significance.展开更多
Hydrocarbons are promising products for CO_(2)electroreduction(CRR)while is impeded by the low selectivity.Turning the curvature of the active site is an effective strategy to change the adsorption properties and furt...Hydrocarbons are promising products for CO_(2)electroreduction(CRR)while is impeded by the low selectivity.Turning the curvature of the active site is an effective strategy to change the adsorption properties and further regulate the product distribution and reactivity.Herein,we have designed a novel V single atom catalyst(SAC)based on rolled two-dimensional(2D)BC_(3)N_(2)substrate with different curvatures.The results have demonstrated that increased curvature can enhance the adsorption strength of CRR intermediates,which follows different mechanisms for systems with low and high curvature.This character eventually leads to the deviation away from the scaling line between Ead[CO]∼Ead[COOH]based on transition metals for V@2D-BC_(3)N_(2)systems.3-3 system is screened as the optimal candidate for hydrocarbons production due to the enhanced binding ability of adsorbates,which can increase the reactivity for hydrocarbons production and hinder the production of H2 and HCOOH simultaneously.展开更多
文摘In this paper, we propose a schistosomiasis model in which two human groups share the water contaminated by schistosomiasis and migrate each other. The dynamical behavior of the model is studied. By calculation, the threshold value is given, which determines whether the disease will be extinct or not. The existence and global stability of the parasite-free equilibrium and the locally stability of the endemic equilibrium are discussed. Numerical simulations indicate that the diffusion from the mild endemic village to severe endemic village is benefit to control schistosomiasis transmission;otherwise it is bad for the disease control.
文摘Dewey is a famous American educator,and his Democracy and Education is a complete and systematic theoretical system of education,so it is know as the classics education, progressive education theory of the general program.There are many defects and deficiencies in the education of junior middle school in our country,the pragmatism education thought in the book has a great influence on the education of junior middle school in our country,so analysis of the educational thoughts of Dewey's Democracy and Education,such as "child centered theory", "school is society", education is "life", "learn from doing" and so on,this is to improve the history education of junior high school in our country and further promote the education reform of our country has a great positive significance.
基金supported by the National Natural Science Foundation of China(No.21603109)the Henan Joint Fund of the National Natural Science Foundation of China(No.U1404216)+3 种基金the Special Fund of Tianshui Normal University,China(No.CXJ2020-08)the Scientific Research Program Funded by Shaanxi Provincial Education Department(No.20JK0676)supported by Natural Science Basic Research Program of Shanxi(Nos.2022JQ-108,2022JQ-096)In addition,this work was also partially supported by the Postgraduate Research Opportunities Program of HZWTECH(No.HZWTECH-PROP).
文摘Hydrocarbons are promising products for CO_(2)electroreduction(CRR)while is impeded by the low selectivity.Turning the curvature of the active site is an effective strategy to change the adsorption properties and further regulate the product distribution and reactivity.Herein,we have designed a novel V single atom catalyst(SAC)based on rolled two-dimensional(2D)BC_(3)N_(2)substrate with different curvatures.The results have demonstrated that increased curvature can enhance the adsorption strength of CRR intermediates,which follows different mechanisms for systems with low and high curvature.This character eventually leads to the deviation away from the scaling line between Ead[CO]∼Ead[COOH]based on transition metals for V@2D-BC_(3)N_(2)systems.3-3 system is screened as the optimal candidate for hydrocarbons production due to the enhanced binding ability of adsorbates,which can increase the reactivity for hydrocarbons production and hinder the production of H2 and HCOOH simultaneously.
