The oriental armyworm,Mythimna separata（Walker）（Lepidoptera：Noctuidae）,is a major migrant pest of grain in China and other Asian countries,causing huge crop production and economic losses nationwide annually.Much...The oriental armyworm,Mythimna separata（Walker）（Lepidoptera：Noctuidae）,is a major migrant pest of grain in China and other Asian countries,causing huge crop production and economic losses nationwide annually.Much of the uniquely difficult aspects of managing M.separata arises from its long-distance migratory behavior.For example,direction and timing of winds from its overwintering regions in the south largely determine where and when large influxes of migrants arrive in the north to oviposit,making prediction of infestations difficult.展开更多
The 2030 Agenda for Sustainable Development explicitly and specifically includes migration in the global development agenda for the first time, and establishes relevant targets, including promoting regular migration a...The 2030 Agenda for Sustainable Development explicitly and specifically includes migration in the global development agenda for the first time, and establishes relevant targets, including promoting regular migration and protecting the rights of migrant workers. These targets are significant achievements of the United Nations in promoting the topic “Migration and Development” and strengthening the human rights-based global migration governance.However, there are many difficulties in achieving these targets, especially when the rights of regular and irregular migration are undermining national sovereignty and security, or are not in line with national development needs. With the continued spread of the CoVID-19pandemic, rising tensions among major powers, and the prevalence of populism and anti-foreigner sentiment in the West, the process of migration and development has been seriously influenced, and the divergent positions and conflicting interests of countries have pushed the migration targets further out of reach. However, in the long run,exploration in this area will help promote global economic recovery in the post-pandemic era and benefit all parties from the positive interactions of migration, development, and human rights.展开更多
We consider a modified Markov branching process incorporating with both state-independent immigration-migration and resurrection. The effect of state-independent immigration-migration is firstly in- vestigated in deta...We consider a modified Markov branching process incorporating with both state-independent immigration-migration and resurrection. The effect of state-independent immigration-migration is firstly in- vestigated in detail. The explicit expressions for the extinction probabilities and mean extinction times are presented. The ergodicity and stability properties of the process incorporating with resurrection structure are then investigated. The conditions for recurrence, ergodicity and exponential ergodicity are obtained. An explicit expression for the equilibrium distribution is also presented. As a preparation, the criteria for regularity and uniqueness for such structure are firstly established.展开更多
基金the special fund for Agro-scientific Research in the Public Interest of China(201403031)for support of this special focus
文摘The oriental armyworm,Mythimna separata（Walker）（Lepidoptera：Noctuidae）,is a major migrant pest of grain in China and other Asian countries,causing huge crop production and economic losses nationwide annually.Much of the uniquely difficult aspects of managing M.separata arises from its long-distance migratory behavior.For example,direction and timing of winds from its overwintering regions in the south largely determine where and when large influxes of migrants arrive in the north to oviposit,making prediction of infestations difficult.
文摘The 2030 Agenda for Sustainable Development explicitly and specifically includes migration in the global development agenda for the first time, and establishes relevant targets, including promoting regular migration and protecting the rights of migrant workers. These targets are significant achievements of the United Nations in promoting the topic “Migration and Development” and strengthening the human rights-based global migration governance.However, there are many difficulties in achieving these targets, especially when the rights of regular and irregular migration are undermining national sovereignty and security, or are not in line with national development needs. With the continued spread of the CoVID-19pandemic, rising tensions among major powers, and the prevalence of populism and anti-foreigner sentiment in the West, the process of migration and development has been seriously influenced, and the divergent positions and conflicting interests of countries have pushed the migration targets further out of reach. However, in the long run,exploration in this area will help promote global economic recovery in the post-pandemic era and benefit all parties from the positive interactions of migration, development, and human rights.
基金supported by National Natural Science Foundations of China (Grant Nos. 10771216 and 11071259)
文摘We consider a modified Markov branching process incorporating with both state-independent immigration-migration and resurrection. The effect of state-independent immigration-migration is firstly in- vestigated in detail. The explicit expressions for the extinction probabilities and mean extinction times are presented. The ergodicity and stability properties of the process incorporating with resurrection structure are then investigated. The conditions for recurrence, ergodicity and exponential ergodicity are obtained. An explicit expression for the equilibrium distribution is also presented. As a preparation, the criteria for regularity and uniqueness for such structure are firstly established.
