We analyzed the generation and dissemination of relevant information on wildlife utilization based on the African bush elephant(Loxodonta africana Blumenbach.),the tiger(Panthera tigris L.)and the totoaba,a species of...We analyzed the generation and dissemination of relevant information on wildlife utilization based on the African bush elephant(Loxodonta africana Blumenbach.),the tiger(Panthera tigris L.)and the totoaba,a species of marine fish,(Totoaba macdonaldi Gilbert)as examples,whose populations are more threatened by the illegal wildlife trade.We compared the illegal trade in wildlife with related information in order to find possible associations,searched for relevant information on major international websites to summarize similarities in information production and dissemination,and used a"Zhiwei"dissemination analysis platform to analyze the dissemination of information circulated at Microblog.The results show that the most infuential information related to the trade in wildlife is mainly generated from news media websites and new selfmedia platforms,usually from non-governmental organizations concerned with wildlife protection.The main factors that affect the depth and breadth of disseminating relevant information on wildlife utilization include the participation of relatively infuential opinion leaders,the verification ratio of forwarding users,the number of followers,and affective identification.Misleading information can stimulate and promote poaching and smuggling,regardless of their real market demand or their products.Therefore,all links in the course of information dissemination should be carefully examined in order to purify the information environment and reduce adverse effects of misleading information on wildlife protection.展开更多
Correction to:J.For.Res.https://doi.org/10.1007/s11676-021-01306-y The article“The dissemination of relevant information on wildlife utilization and its connection with the illegal trade in wildlife”,written by Zhif...Correction to:J.For.Res.https://doi.org/10.1007/s11676-021-01306-y The article“The dissemination of relevant information on wildlife utilization and its connection with the illegal trade in wildlife”,written by Zhifan Song·Qiang Wang·Zhen Miao·Wei Zhang and Xuehong Zhou,was originally pub-lished electronically on the publisher’s internet portal on 11th March 2021 without open access.展开更多
In this paper,we formulate and analyse a kind of parareal-RKN algo-rithms with energy conservation for Hamiltonian systems.The proposed algorithms are constructed by using the ideas of parareal methods,Runge-Kutta-Nys...In this paper,we formulate and analyse a kind of parareal-RKN algo-rithms with energy conservation for Hamiltonian systems.The proposed algorithms are constructed by using the ideas of parareal methods,Runge-Kutta-Nystrom(RKN)methods and projection methods.It is shown that the algorithms can exactly pre-serve the energy of Hamiltonian systems.Moreover,the convergence of the integra-tors is rigorously analysed.Three numerical experiments are carried out to support the theoretical results presented in this paper and show the numerical behaviour of the derived algorithms.展开更多
A quasi-Newton waveform relaxation （WR） algorithm for semi-linear reaction-diffusion equations is presented at first in this paper. Using the idea of energy estimate, a general proof method for convergence of the co...A quasi-Newton waveform relaxation （WR） algorithm for semi-linear reaction-diffusion equations is presented at first in this paper. Using the idea of energy estimate, a general proof method for convergence of the continuous case and the discrete case of quasi-Newton WR is given, which appears to be the superlinear rate. The semi-linear wave equation and semi-linear coupled equations can similarly be solved by quasi-Newton WR algorithm and be proved as convergent with the energy inequalities. Finally several parallel numerical experiments are implemented to confirm the effectiveness of the above theories.展开更多
In this paper,we derive and analyse waveform relaxation(WR)methods for solving differential equations evolving on a Lie-group.We present both continuous-time and discrete-time WR methods and study their convergence pr...In this paper,we derive and analyse waveform relaxation(WR)methods for solving differential equations evolving on a Lie-group.We present both continuous-time and discrete-time WR methods and study their convergence properties.In the discrete-time case,the novel methods are constructed by combining WR methods with Runge-KuttaMunthe-Kaas(RK-MK)methods.The obtained methods have both advantages of WR methods and RK-MK methods,which simplify the computation by decoupling strategy and preserve the numerical solution of Lie-group equations on a manifold.Three numerical experiments are given to illustrate the feasibility of the new WR methods.展开更多
基金supported by“Research on the Infuence and Countermeasures of International NGOs in the Field of Forestry,Grassland and Wildlife of the International Cooperation Division”of the National Forestry and Grassland Administration“Research and Development of Wildlife Smuggling Situation and Case Information Integrated Management System”funded by the Endangered Species Import and Export Management Office of the People’s Republic of China“the Fundamental Research Funds for the Central Universities”(2572019DA02)。
文摘We analyzed the generation and dissemination of relevant information on wildlife utilization based on the African bush elephant(Loxodonta africana Blumenbach.),the tiger(Panthera tigris L.)and the totoaba,a species of marine fish,(Totoaba macdonaldi Gilbert)as examples,whose populations are more threatened by the illegal wildlife trade.We compared the illegal trade in wildlife with related information in order to find possible associations,searched for relevant information on major international websites to summarize similarities in information production and dissemination,and used a"Zhiwei"dissemination analysis platform to analyze the dissemination of information circulated at Microblog.The results show that the most infuential information related to the trade in wildlife is mainly generated from news media websites and new selfmedia platforms,usually from non-governmental organizations concerned with wildlife protection.The main factors that affect the depth and breadth of disseminating relevant information on wildlife utilization include the participation of relatively infuential opinion leaders,the verification ratio of forwarding users,the number of followers,and affective identification.Misleading information can stimulate and promote poaching and smuggling,regardless of their real market demand or their products.Therefore,all links in the course of information dissemination should be carefully examined in order to purify the information environment and reduce adverse effects of misleading information on wildlife protection.
文摘Correction to:J.For.Res.https://doi.org/10.1007/s11676-021-01306-y The article“The dissemination of relevant information on wildlife utilization and its connection with the illegal trade in wildlife”,written by Zhifan Song·Qiang Wang·Zhen Miao·Wei Zhang and Xuehong Zhou,was originally pub-lished electronically on the publisher’s internet portal on 11th March 2021 without open access.
基金supported by the NSFC(Grants 12371403,12271426)by the Key Research and Development Projects of Shaanxi Province(Grant 2023-YBSF-399).
文摘In this paper,we formulate and analyse a kind of parareal-RKN algo-rithms with energy conservation for Hamiltonian systems.The proposed algorithms are constructed by using the ideas of parareal methods,Runge-Kutta-Nystrom(RKN)methods and projection methods.It is shown that the algorithms can exactly pre-serve the energy of Hamiltonian systems.Moreover,the convergence of the integra-tors is rigorously analysed.Three numerical experiments are carried out to support the theoretical results presented in this paper and show the numerical behaviour of the derived algorithms.
基金This work was supported by the Natural Science Foundation of China （NSFC） under grant （11371287, 61663043） and Natural Science Basis Research Plan in Shaanxi Province of China under grant 2016JM5077.
文摘A quasi-Newton waveform relaxation （WR） algorithm for semi-linear reaction-diffusion equations is presented at first in this paper. Using the idea of energy estimate, a general proof method for convergence of the continuous case and the discrete case of quasi-Newton WR is given, which appears to be the superlinear rate. The semi-linear wave equation and semi-linear coupled equations can similarly be solved by quasi-Newton WR algorithm and be proved as convergent with the energy inequalities. Finally several parallel numerical experiments are implemented to confirm the effectiveness of the above theories.
基金supported by the Natural Science Foundation of China(NSFC)under grant 11871393International Science and Technology Cooperation Program of Shaanxi Key Research&Development Plan under grant 2019KWZ-08.
文摘In this paper,we derive and analyse waveform relaxation(WR)methods for solving differential equations evolving on a Lie-group.We present both continuous-time and discrete-time WR methods and study their convergence properties.In the discrete-time case,the novel methods are constructed by combining WR methods with Runge-KuttaMunthe-Kaas(RK-MK)methods.The obtained methods have both advantages of WR methods and RK-MK methods,which simplify the computation by decoupling strategy and preserve the numerical solution of Lie-group equations on a manifold.Three numerical experiments are given to illustrate the feasibility of the new WR methods.
