The importance of water to our lives cannot be overemphasized as it is the source of all living things. Water scarcity is a concern in many Middle Eastern nations due to war and politics. Many people lose their essenc...The importance of water to our lives cannot be overemphasized as it is the source of all living things. Water scarcity is a concern in many Middle Eastern nations due to war and politics. Many people lose their essence due to actions made by their rulers, such as the Marsh Arabs. Water and biodiversity should be considered, and governments should be held accountable for attaining a more balanced lifestyle and reducing immigrant levels. Many academics have also explored the hydro-immigration of marshland residents. They suffer more hazards due to a lack of money, poor education, and social instability than their colleagues who remain in their own country. Furthermore, they have insufficient health care and have difficulty integrating into the new community. This implies that not all nations that receive such migrants can implement programs to assist the immigrants. This research reveals how wars, hydro-politics, and immigration issues have drastically affected architecture and social structures in the Arab Marshes region, leading to ecological destruction, mass migrations, and cultural loss. Therefore, this work focuses on the need to critically investigate all factors covered within the context of this research.展开更多
With the deepening of globalization,immigration and pluralism have become increasingly common social phenomena.The research of the resulting immigrant literature is an important way to understand the mental journey of...With the deepening of globalization,immigration and pluralism have become increasingly common social phenomena.The research of the resulting immigrant literature is an important way to understand the mental journey of immigrant groups and their construction of cultural identity.In the German-speaking area,immigrant literature has gradually taken center stage over the years,becoming an important part of the German language literature,and immigrant writers have also frequently won various literary prizes,which can be described as particularly dazzling.Meanwhile,generations of writers have been thinking about and exploring the intergenerational relationships and differences among immigrant groups in the context of their own experiences.This paper will focus on some outstanding immigrant writers and discuss the intergenerational writing in immigrant literature by means of their works.展开更多
This study employs mathematical modeling to analyze the impact of active immigrants on Foot and Mouth Disease (FMD) transmission dynamics. We calculate the reproduction number (R<sub>0</sub>) using the nex...This study employs mathematical modeling to analyze the impact of active immigrants on Foot and Mouth Disease (FMD) transmission dynamics. We calculate the reproduction number (R<sub>0</sub>) using the next-generation matrix approach. Applying the Routh-Hurwitz Criterion, we establish that the Disease-Free Equilibrium (DFE) point achieves local asymptotic stability when R<sub>0</sub> α<sub>1</sub> and α<sub>2</sub>) are closely associated with reduced susceptibility in animal populations, underscoring the link between immigrants and susceptibility. Furthermore, our findings emphasize the interplay of disease introduction with population response and adaptation, particularly involving incoming infectious immigrants. Swift interventions are vital due to the limited potential for disease establishment and rapid susceptibility decline. This study offers crucial insights into the complexities of FMD transmission with active immigrants, informing effective disease management strategies.展开更多
The school placement processes of students from immigrant backgrounds considered to be in“difficulty”is an international concern at the intersection of works relating to special education and those concerning the sc...The school placement processes of students from immigrant backgrounds considered to be in“difficulty”is an international concern at the intersection of works relating to special education and those concerning the school experiences of students from immigrant backgrounds or racialized groups.The research problem of this article concerns the identification of these students as disabled or as having adjustment or learning difficulties.From a perspective anchored in Disability Critical Race Studies,this ethnographic study documents different interpretations of perceived difficulties made by school actors with regard to seven primary school students from immigrant backgrounds.Five interpretation types are presented:(1)medicalization by dismissal of cultural markers,(2)medicalization by professional constraint,(3)medicalization by cultural deficit,(4)precautionary wait,and(5)cultural differentialism.Our results help to shed light on the special education overrepresentation phenomenon regarding these students and to understand how ableism and(neo)racism contribute to it.展开更多
In recent years,Francophone schools in Alberta,a province in western Canada,have seen significant ethnocultural diversification of their school population,thus reflecting recent migratory changes in Canada.The populat...In recent years,Francophone schools in Alberta,a province in western Canada,have seen significant ethnocultural diversification of their school population,thus reflecting recent migratory changes in Canada.The population of a Francophone school board located in an agglomeration of Alberta reflects these new migratory trends.A partial ethnodemographic portrait carried out in 2003 in six of its schools indicates that 50%of the pupils come from an immigrant background and come from 23 different countries;mostly from sub-Saharan African countries.This demographic reality,confirmed more than a decade later,represents a major structural change for Francophone schools.In Alberta,as in other Canadian provinces,inclusion is at the heart of discourse and educational practices.With a transformative aim,it intends to promote ethnocultural diversity in the classroom and equal opportunities through school equity practices.This article focuses on the settlement workers in schools responsible for bridging family,community,and school cultures.The analysis of the interviews of the four workers sheds light on and questions both the institutional practices and the personal strategies put in place to face the challenges encountered in this tripartite collaboration.展开更多
In 1994, the total Chinese population in the United States were 2,017,799 which were 0.8 percent of the total US population. The Chinese population were highly concentrated by regions and among the total population. B...In 1994, the total Chinese population in the United States were 2,017,799 which were 0.8 percent of the total US population. The Chinese population were highly concentrated by regions and among the total population. By states, 42 percent of total Chinese population were found in California, 17 percent in New York. More than 80 percent total Chinese population were concentrated in 9 states. By metropolitan areas, 14.73 percent of total Chinese population were found in Los Angeles and New York respectively. Compared with the total US population, 60 percent Chinese population were found in less than 20 percent total US population and 80 percent in 50 percent. By studying the Chinese population distribution and the reason behind it, we hope to find some interesting relationships among the characteristics of this distribution and the historical, cultural, social and economic factors influencing it.展开更多
In this article the supercritical bisexual Galton-Watson branching processes with the immigration of mating units is considered. A necessary condition for the almost sure convergence, and a sufficient condition for th...In this article the supercritical bisexual Galton-Watson branching processes with the immigration of mating units is considered. A necessary condition for the almost sure convergence, and a sufficient condition for the L^1 convergence are given for the process with the suitably normed condition.展开更多
Let(Z_(n))be a branching process with immigration in a random environmentξ,whereξis an independent and identically distributed sequence of random variables.We show asymptotic properties for all the moments of Z_(n) ...Let(Z_(n))be a branching process with immigration in a random environmentξ,whereξis an independent and identically distributed sequence of random variables.We show asymptotic properties for all the moments of Z_(n) and describe the decay rates of the n-step transition probabilities.As applications,a large deviation principle for the sequence log Z_(n) is established,and related large deviations are also studied.展开更多
We are interested in the convergence rates of the submartingale Wn=Z_(n)/Π_(n)to its limit W,where(Π_(n))is the usually used norming sequence and(Z_(n))is a supercritical branching process with immigration(Y_(n))in ...We are interested in the convergence rates of the submartingale Wn=Z_(n)/Π_(n)to its limit W,where(Π_(n))is the usually used norming sequence and(Z_(n))is a supercritical branching process with immigration(Y_(n))in a stationary and ergodic environmentξ.Under suitable conditions,we establish the following central limit theorems and results about the rates of convergence in probability or in law:(i)W-W_(n) with suitable normalization converges to the normal law N(0,1),and similar results also hold for W_(n+k)-W_(n) for each fixed k∈N^(*);(ii)for a branching process with immigration in a finite state random environment,if W_(1) has a finite exponential moment,then so does W,and the decay rate of P(|W-W_(n)|>ε)is supergeometric;(iii)there are normalizing constants an(ξ)(that we calculate explicitly)such that a_(n)(ξ)(W-W_(n))converges in law to a mixture of the Gaussian law.展开更多
The increasing amounts of artificial marine substrates, in many parts of the world have been proposed as a potential driver of Aurelia spp. blooms, on account of providing extra habitats for the settlement and the pro...The increasing amounts of artificial marine substrates, in many parts of the world have been proposed as a potential driver of Aurelia spp. blooms, on account of providing extra habitats for the settlement and the proliferation of the benthic stage(polyps). Previous experiments have mainly focused on the substrate choices of Aurelia spp. planulae. However, substrate preferences for the proliferation and immigration of polyps have not been reported. We monitored the propagation and immigration of Aurelia aurita(s. l.) polyps on two natural and nine artificial substrates at constant temperature(20±0.5°C) and salinity(30±0.5) in beakers and a glass aquarium in the laboratory, respectively. The results showed that, among artificial substrates, the highest number for polyp proliferation and immigration was found on nets, rigid polyvinyl chloride plates(RPVC), and wood. The lowest density of polyps was present on iron plates. Among natural substrates, the asexual reproduction rate of polyps on Patinopecten yessoensis(Jay, 1857) shells was significantly higher than Azumapecten farreri(Jones & Preston, 1904). On the account of the distinction in the roughness, chemical properties and biofilms of these material surfaces, bare artificial or natural substrates discriminatively affect the proliferation and the immigration of Aurelia spp. polyps at laboratory. These observations suggest that, even in the natural environment, different materials and texture may influence the composition and the abundance of the fouling communities and the assemblages of polyps and, indirectly, have effects on the amounts of released medusae.展开更多
In order to find out the effect of human (sexual) behavior change and immigration in spreading the HIV/AIDS, a deterministic model of HIV/AIDS with infective immigration is formulated. First, basic properties of the m...In order to find out the effect of human (sexual) behavior change and immigration in spreading the HIV/AIDS, a deterministic model of HIV/AIDS with infective immigration is formulated. First, basic properties of the model, including non-negativity and boundedness of the solutions, existence of the endemic equilibrium and the basic reproduction number, R0 are analyzed. The geometrical approach is used to obtain the global asymptotic stability of endemic equilibrium. Then the basic model is extended to include several control efforts aimed at reducing infection and changing behavior. Pontryagin’s maximum principle is used to derive the optimality system and solve the system numerically. Our numerical findings are illustrated through simulations using MATLAB, which shows reliability of our model from the practical point of view.展开更多
Various features of the atmospheric environment affect the number of migratory insects, besides their initial population. However, little is known about the impact of atmospheric low-frequency oscillation(10 to 90 day...Various features of the atmospheric environment affect the number of migratory insects, besides their initial population. However, little is known about the impact of atmospheric low-frequency oscillation(10 to 90 days) on insect migration. A case study was conducted to ascertain the influence of low-frequency atmospheric oscillation on the immigration of brown planthopper, Nilaparvata lugens(Stl), in Hunan and Jiangxi provinces. The results showed the following:(1) The number of immigrating N. lugens from April to June of 2007 through 2016 mainly exhibited a periodic oscillation of 10 to 20 days.(2) The 10-20 d low-frequency number of immigrating N. lugens was significantly correlated with a low-frequency wind field and a geopotential height field at 850 h Pa.(3) During the peak phase of immigration, southwest or south winds served as a driving force and carried N. lugens populations northward, and when in the back of the trough and the front of the ridge, the downward airflow created a favorable condition for N. lugens to land in the study area. In conclusion, the northward migration of N. lugens was influenced by a low-frequency atmospheric circulation based on the analysis of dynamics. This study was the first research connecting atmospheric low-frequency oscillation to insect migration.展开更多
Immigration issue is one of the major problems in China today.The implementation of disasterinduced immigration policy is a significant contributor to effectively promote targeted measures of helping people in contigu...Immigration issue is one of the major problems in China today.The implementation of disasterinduced immigration policy is a significant contributor to effectively promote targeted measures of helping people in contiguous poor areas with particular difficulties to be out of poverty.Empirical investigation has been conducted to get a systematic grasp of the implementation deviation of massive disaster-induced immigration phenomenon in southern Shaanxi area.According to the survey,phenomenon of "immigrate the rich,while abandoning the poor,more houses with fewer immigrants,four moves and four drops,poor spot choosing and relaxed project management" demands improvement of execution ability.The implementation of such public policy has a large space to improve.Enough attention should be paid to the negative impact of such deviation,and only in this way can we live up to the desired objectives.展开更多
Immigration relocation of the poor in rural areas is an effective targeted measure to help people out of poverty in the new normal. The structural constraints lie in the heavy pressure of land resources and environmen...Immigration relocation of the poor in rural areas is an effective targeted measure to help people out of poverty in the new normal. The structural constraints lie in the heavy pressure of land resources and environmental carrying capacity, high cost of immigration settlement and delayed counterpart funds, insufficient industrial support and difficulty in living-making. To realize the goal of targeted poverty alleviation, it demands determination and capability from the policy designer, as well the social basis. The effect imposed by the structural constraints to implementation of such policy should be paid adequate attention by public sectors. It is supposed to change the guiding direction of the policy timely and to relieve financial burden of immigration settlement and resource environmental bearing capacity through mechanism of joint efforts from internal and more external support.展开更多
This paper seeks to present how people's attitudes change according to the religion of immigrants and how this affects the immigrants' citizenship process in the USA. In general, immigration is a controversial issue...This paper seeks to present how people's attitudes change according to the religion of immigrants and how this affects the immigrants' citizenship process in the USA. In general, immigration is a controversial issue, for that reason people may conceal their real thoughts and have a tendency to give the socially accepted answers. For that reason, in this paper the list experiment method is used to get the real opinions of people. Results indicate that, people in fact conceal their real thoughts in response to direct survey questions. In addition, the results show that Americans are generally concerned about immigration. However, when it is compared to Muslim and Christian immigrants, people are more likely to support granting citizenship to a Christian immigrant compared to a Muslim immigrant. The other most important finding is that being against Muslim immigrants is considered more acceptable. In other words, people may feel pressure to say that they do not support Muslim immigration, for that reason when it is asked directly, some people (more than 10%) automatically say that they are against Muslim immigrants compared to the findings in the list experiment.展开更多
The concepts of bi-immigration birth and death density matrix in random environment and bi-immigration birth and death process in random environment are introduced. For any bi-immigration birth and death matrix in ran...The concepts of bi-immigration birth and death density matrix in random environment and bi-immigration birth and death process in random environment are introduced. For any bi-immigration birth and death matrix in random environment Q(θ) with birth rate λ 〈 death rate μ, the following results are proved, (1) there is an unique q-process in random environment, P^-(θ*(0);t) = (p^-(θ^*(0);t,i,j),i,j ≥ 0), which is ergodic, that is, lim t→∞(θ^*(0);t,i,j) = π^-(θ^*(0);j) ≥0 does not depend on i ≥ 0 and ∑j≥0π (θ*(0);j) = 1, (2) there is a bi-immigration birth and death process in random enjvironment (X^* = {X^*,t ≥ 0},ε^* = {εt,t ∈ (-∞, ∞)}) with random transition matrix P^-(θ^* (0);t) such that X^* is a strictly stationary process.展开更多
Laos was once unique in Southeast Asia for its remarkably small overseas Chinese communities. Most of them fled this country when the communist forces seized power in 1975. Since Laos opened its economy in 1986, the C...Laos was once unique in Southeast Asia for its remarkably small overseas Chinese communities. Most of them fled this country when the communist forces seized power in 1975. Since Laos opened its economy in 1986, the Chinese in Laos have been able to develop in many areas. Especially, the visit of Premier LI Peng to Vientiane in 1990 marked a turning point in China-Laos relations. Unlike Cambodia, the reawakening of a Chinese community in Laos did not come from the Huaqiao, this arose from a new cycle of immigrants, who started pouring into northern Laos in the late 1990s at an unprecedented scale. Compared with other Southeast Asian nations, the Chinese in Laos are less in number and weaker in economic power. In this study, we focus on (1) Analysis the ways of the new Chinese immigrants in Laos; (2) Assess the role of new Chinese immigrants in the process of China increasing their influence in Laos and how Laos response to this issue; and (3) The trend of new Chinese immigrants in Laos in the near future. Firstly, the rapid of Chinese investment to Laos in the last two decades is the most important factor driving the Chinese migrants into this country. The first new Chinese immigrants arrived in the mid-1990s as workers or technicians on road construction projects and as part of the industrial cooperation between Yunnan and the northern provinces of Laos. Since the 2000s, China has been pouring aid and investment into Laos. Chinese companies are involved in almost all areas of this country's economy, from hydropower to mining, agriculture, service, and hospitality. The increasing of Chinese exports, investment, aids and Chinese contracted project constructions in Laos led to mass Chinese immigrants going to Laos to work in all the economic sectors which the Chinese are involved in this country. Most of them chose to stay on and started their own businesses. Secondly, the wave of new Chinese immigrants in Laos helps Chinese government to relieve the pressure of solving jobs for their citizens. The semi-skilled and unskilled labor can go to Laos to work for the Chinese companies. Moreover, the outflow of petty traders has been prompted by the oversupply of certain goods in China as well as intense domestic competition. The investors also can find the better developing business opportunities. Although, the increasing of new Chinese immigrants make the local society change so much. Some Laotians feel cautious about the presence of so many Chinese people in Laos. Thirdly, with the increasing of Chinese's influence in Laos, especially in the economic, the position of the Chinese community in Laos will grow stronger in both quantity and economic and political status. Assessing the trend of increasing of new Chinese immigrations in Laos and the growth of the Chinese community are seen by the Laos government creating favorable conditions for China's investment, commercial activity, tourism activities, and cultural exchanges.展开更多
In a commercialized and fragment media market where crisis and humanitarian interventions are big news that sells, how do politicians and the public respond to them? Bearing in mind that immigration is a phenomenon w...In a commercialized and fragment media market where crisis and humanitarian interventions are big news that sells, how do politicians and the public respond to them? Bearing in mind that immigration is a phenomenon with a growing presence in society and increasingly politicized, this paper explores an important and persistent question regarding the role of news media in affecting policy decisions, particularly during times of crisis (Paletz, 1998), transference of the issue and the media frames occurs. Having taken into account the agenda building paradigm and the concept of flame (Entman, 1993; Snow & Benford, 1988), the topic of immigration is analyzed in the Spanish main newspapers (El Pais & El Mundo) and in the political interventions (Parliamentary Debates). In order to implement this extraction and framing analysis, the associative method is adopted. The assaults of Ceuta and Melilla (2005) and the Canarias crisis (2006) are taken as the cases of study. The findings of this research highlight that moments of humanitarian crisis and key newsworthy events related to African immigrants increase the media's power to introduce the issue of immigration and to have influence on the frames used in the political and public agenda.展开更多
US Latinos experience higher rates of obesity than their non-Latino counterparts. Factors associated with immigration, including length of residence in the United States, are associated with an increased risk of obesi...US Latinos experience higher rates of obesity than their non-Latino counterparts. Factors associated with immigration, including length of residence in the United States, are associated with an increased risk of obesity. Latino community health workers (CHWs) work closely with communities, and are in an ideal position to provide insight on the underlying mechanisms of the Latino obesity epidemic. Focus groups were conducted with 15 CHWs and thematic analyses were performed to explore elements associated with obesity among Latino immigrants. Emergent themes included: reduction in physical activity due to less walkable spaces, more transportation options, and busier schedules in the United States. Interviewees also identified a sudden increase in access to unhealthy food and an abrupt reduction in access to, and affordability of, healthy food choices upon immigration. Culturally appropriate interventions to increase awareness of these factors and neutralize their effects among early Latino immigrants are recommended.展开更多
In 1996, Congress enacted Illegal Immigration Reform and Immigrant Responsibility Act of 1996 (IIRIRA). Actually, it was a conservative legislation. It not only tightened border control but also strictly limited the...In 1996, Congress enacted Illegal Immigration Reform and Immigrant Responsibility Act of 1996 (IIRIRA). Actually, it was a conservative legislation. It not only tightened border control but also strictly limited the public benefits about illegal immigration. Why Congress enacted serious immigration legislation in the 1990s? Generally speaking, economic factor and politics played an important role in it. In derails, several reasons can account for its conservatism: (1) The first reason is that the increase number of illegal immigration led to the high cost of state governments, many state governments complained it; (2) The second reason is the influence of 187 Act which deported illegal immigration in primary and high school and it produced chain effect for other states; (3) The third reason is political election, including Congress election and president campaign. 187 Act greatly influenced GOP (Grand Old Party) and Congress, which was controlled by GOP, tended to take serious measures to contain illegal immigrants. Did IIRRA work? In fact, it did not control illegal immigration. After 1990s, more and more illegal immigration entered into America and U.S, has become the nation with the most illegal immigrants in the world. Therefore, Congress should consider comprehensive immigration reform.展开更多
文摘The importance of water to our lives cannot be overemphasized as it is the source of all living things. Water scarcity is a concern in many Middle Eastern nations due to war and politics. Many people lose their essence due to actions made by their rulers, such as the Marsh Arabs. Water and biodiversity should be considered, and governments should be held accountable for attaining a more balanced lifestyle and reducing immigrant levels. Many academics have also explored the hydro-immigration of marshland residents. They suffer more hazards due to a lack of money, poor education, and social instability than their colleagues who remain in their own country. Furthermore, they have insufficient health care and have difficulty integrating into the new community. This implies that not all nations that receive such migrants can implement programs to assist the immigrants. This research reveals how wars, hydro-politics, and immigration issues have drastically affected architecture and social structures in the Arab Marshes region, leading to ecological destruction, mass migrations, and cultural loss. Therefore, this work focuses on the need to critically investigate all factors covered within the context of this research.
文摘With the deepening of globalization,immigration and pluralism have become increasingly common social phenomena.The research of the resulting immigrant literature is an important way to understand the mental journey of immigrant groups and their construction of cultural identity.In the German-speaking area,immigrant literature has gradually taken center stage over the years,becoming an important part of the German language literature,and immigrant writers have also frequently won various literary prizes,which can be described as particularly dazzling.Meanwhile,generations of writers have been thinking about and exploring the intergenerational relationships and differences among immigrant groups in the context of their own experiences.This paper will focus on some outstanding immigrant writers and discuss the intergenerational writing in immigrant literature by means of their works.
文摘This study employs mathematical modeling to analyze the impact of active immigrants on Foot and Mouth Disease (FMD) transmission dynamics. We calculate the reproduction number (R<sub>0</sub>) using the next-generation matrix approach. Applying the Routh-Hurwitz Criterion, we establish that the Disease-Free Equilibrium (DFE) point achieves local asymptotic stability when R<sub>0</sub> α<sub>1</sub> and α<sub>2</sub>) are closely associated with reduced susceptibility in animal populations, underscoring the link between immigrants and susceptibility. Furthermore, our findings emphasize the interplay of disease introduction with population response and adaptation, particularly involving incoming infectious immigrants. Swift interventions are vital due to the limited potential for disease establishment and rapid susceptibility decline. This study offers crucial insights into the complexities of FMD transmission with active immigrants, informing effective disease management strategies.
文摘The school placement processes of students from immigrant backgrounds considered to be in“difficulty”is an international concern at the intersection of works relating to special education and those concerning the school experiences of students from immigrant backgrounds or racialized groups.The research problem of this article concerns the identification of these students as disabled or as having adjustment or learning difficulties.From a perspective anchored in Disability Critical Race Studies,this ethnographic study documents different interpretations of perceived difficulties made by school actors with regard to seven primary school students from immigrant backgrounds.Five interpretation types are presented:(1)medicalization by dismissal of cultural markers,(2)medicalization by professional constraint,(3)medicalization by cultural deficit,(4)precautionary wait,and(5)cultural differentialism.Our results help to shed light on the special education overrepresentation phenomenon regarding these students and to understand how ableism and(neo)racism contribute to it.
文摘In recent years,Francophone schools in Alberta,a province in western Canada,have seen significant ethnocultural diversification of their school population,thus reflecting recent migratory changes in Canada.The population of a Francophone school board located in an agglomeration of Alberta reflects these new migratory trends.A partial ethnodemographic portrait carried out in 2003 in six of its schools indicates that 50%of the pupils come from an immigrant background and come from 23 different countries;mostly from sub-Saharan African countries.This demographic reality,confirmed more than a decade later,represents a major structural change for Francophone schools.In Alberta,as in other Canadian provinces,inclusion is at the heart of discourse and educational practices.With a transformative aim,it intends to promote ethnocultural diversity in the classroom and equal opportunities through school equity practices.This article focuses on the settlement workers in schools responsible for bridging family,community,and school cultures.The analysis of the interviews of the four workers sheds light on and questions both the institutional practices and the personal strategies put in place to face the challenges encountered in this tripartite collaboration.
文摘In 1994, the total Chinese population in the United States were 2,017,799 which were 0.8 percent of the total US population. The Chinese population were highly concentrated by regions and among the total population. By states, 42 percent of total Chinese population were found in California, 17 percent in New York. More than 80 percent total Chinese population were concentrated in 9 states. By metropolitan areas, 14.73 percent of total Chinese population were found in Los Angeles and New York respectively. Compared with the total US population, 60 percent Chinese population were found in less than 20 percent total US population and 80 percent in 50 percent. By studying the Chinese population distribution and the reason behind it, we hope to find some interesting relationships among the characteristics of this distribution and the historical, cultural, social and economic factors influencing it.
文摘In this article the supercritical bisexual Galton-Watson branching processes with the immigration of mating units is considered. A necessary condition for the almost sure convergence, and a sufficient condition for the L^1 convergence are given for the process with the suitably normed condition.
基金partially supported by the National Nature Science Foundation of China(11601286,11501146)。
文摘Let(Z_(n))be a branching process with immigration in a random environmentξ,whereξis an independent and identically distributed sequence of random variables.We show asymptotic properties for all the moments of Z_(n) and describe the decay rates of the n-step transition probabilities.As applications,a large deviation principle for the sequence log Z_(n) is established,and related large deviations are also studied.
基金supported by the National Natural Science Foundation of China(11571052,11731012)the Hunan Provincial Natural Science Foundation of China(2018JJ2417)the Open Fund of Hunan Provincial Key Laboratory of Mathematical Modeling and Analysis in Engineering(2018MMAEZD02)。
文摘We are interested in the convergence rates of the submartingale Wn=Z_(n)/Π_(n)to its limit W,where(Π_(n))is the usually used norming sequence and(Z_(n))is a supercritical branching process with immigration(Y_(n))in a stationary and ergodic environmentξ.Under suitable conditions,we establish the following central limit theorems and results about the rates of convergence in probability or in law:(i)W-W_(n) with suitable normalization converges to the normal law N(0,1),and similar results also hold for W_(n+k)-W_(n) for each fixed k∈N^(*);(ii)for a branching process with immigration in a finite state random environment,if W_(1) has a finite exponential moment,then so does W,and the decay rate of P(|W-W_(n)|>ε)is supergeometric;(iii)there are normalizing constants an(ξ)(that we calculate explicitly)such that a_(n)(ξ)(W-W_(n))converges in law to a mixture of the Gaussian law.
基金Supported by the State Key Program of National Natural Science of China(No.41230963)the Strategic Priority Research Program of the Chinese Academy of Sciences(No.XDA11020305)+1 种基金the Shandong Joint Fund for Marine Ecology and Environmental Sciences(No.U1406403)the National Natural Science Foundation of China(No.41506144)
文摘The increasing amounts of artificial marine substrates, in many parts of the world have been proposed as a potential driver of Aurelia spp. blooms, on account of providing extra habitats for the settlement and the proliferation of the benthic stage(polyps). Previous experiments have mainly focused on the substrate choices of Aurelia spp. planulae. However, substrate preferences for the proliferation and immigration of polyps have not been reported. We monitored the propagation and immigration of Aurelia aurita(s. l.) polyps on two natural and nine artificial substrates at constant temperature(20±0.5°C) and salinity(30±0.5) in beakers and a glass aquarium in the laboratory, respectively. The results showed that, among artificial substrates, the highest number for polyp proliferation and immigration was found on nets, rigid polyvinyl chloride plates(RPVC), and wood. The lowest density of polyps was present on iron plates. Among natural substrates, the asexual reproduction rate of polyps on Patinopecten yessoensis(Jay, 1857) shells was significantly higher than Azumapecten farreri(Jones & Preston, 1904). On the account of the distinction in the roughness, chemical properties and biofilms of these material surfaces, bare artificial or natural substrates discriminatively affect the proliferation and the immigration of Aurelia spp. polyps at laboratory. These observations suggest that, even in the natural environment, different materials and texture may influence the composition and the abundance of the fouling communities and the assemblages of polyps and, indirectly, have effects on the amounts of released medusae.
文摘In order to find out the effect of human (sexual) behavior change and immigration in spreading the HIV/AIDS, a deterministic model of HIV/AIDS with infective immigration is formulated. First, basic properties of the model, including non-negativity and boundedness of the solutions, existence of the endemic equilibrium and the basic reproduction number, R0 are analyzed. The geometrical approach is used to obtain the global asymptotic stability of endemic equilibrium. Then the basic model is extended to include several control efforts aimed at reducing infection and changing behavior. Pontryagin’s maximum principle is used to derive the optimality system and solve the system numerically. Our numerical findings are illustrated through simulations using MATLAB, which shows reliability of our model from the practical point of view.
基金National Science Foundation of China(41075086,41475106)Science Research Program of Universities and Colleges in Jiangsu Province(14KJA170003)Priority Academic Program Development of Jiangsu Higher Education Institutions(IRT1147)
文摘Various features of the atmospheric environment affect the number of migratory insects, besides their initial population. However, little is known about the impact of atmospheric low-frequency oscillation(10 to 90 days) on insect migration. A case study was conducted to ascertain the influence of low-frequency atmospheric oscillation on the immigration of brown planthopper, Nilaparvata lugens(Stl), in Hunan and Jiangxi provinces. The results showed the following:(1) The number of immigrating N. lugens from April to June of 2007 through 2016 mainly exhibited a periodic oscillation of 10 to 20 days.(2) The 10-20 d low-frequency number of immigrating N. lugens was significantly correlated with a low-frequency wind field and a geopotential height field at 850 h Pa.(3) During the peak phase of immigration, southwest or south winds served as a driving force and carried N. lugens populations northward, and when in the back of the trough and the front of the ridge, the downward airflow created a favorable condition for N. lugens to land in the study area. In conclusion, the northward migration of N. lugens was influenced by a low-frequency atmospheric circulation based on the analysis of dynamics. This study was the first research connecting atmospheric low-frequency oscillation to insect migration.
基金supported by the National Social Science Fond of China(Grant No.13XSH031)Shaanxi Key Theoretical & Realistic Projects of Social Science Research Foundation(Grant No.2015Z023)+1 种基金Shaanxi Agricultural Collaborative Innovation and Promotion Alliance Foundation(Grant No.LM2015015)the Fundamental Research Funds for the Central Universities(Grant No.2013RWYB09)
文摘Immigration issue is one of the major problems in China today.The implementation of disasterinduced immigration policy is a significant contributor to effectively promote targeted measures of helping people in contiguous poor areas with particular difficulties to be out of poverty.Empirical investigation has been conducted to get a systematic grasp of the implementation deviation of massive disaster-induced immigration phenomenon in southern Shaanxi area.According to the survey,phenomenon of "immigrate the rich,while abandoning the poor,more houses with fewer immigrants,four moves and four drops,poor spot choosing and relaxed project management" demands improvement of execution ability.The implementation of such public policy has a large space to improve.Enough attention should be paid to the negative impact of such deviation,and only in this way can we live up to the desired objectives.
基金supported by Shaanxi Agricultural Collaborative Innovation and Promotion Alliance Foundation (Grant No. LM20150015)Shaanxi Key Theoretical & Realistic Projects of Social Science Research Foundation (Grant No. 2015Z023)
文摘Immigration relocation of the poor in rural areas is an effective targeted measure to help people out of poverty in the new normal. The structural constraints lie in the heavy pressure of land resources and environmental carrying capacity, high cost of immigration settlement and delayed counterpart funds, insufficient industrial support and difficulty in living-making. To realize the goal of targeted poverty alleviation, it demands determination and capability from the policy designer, as well the social basis. The effect imposed by the structural constraints to implementation of such policy should be paid adequate attention by public sectors. It is supposed to change the guiding direction of the policy timely and to relieve financial burden of immigration settlement and resource environmental bearing capacity through mechanism of joint efforts from internal and more external support.
文摘This paper seeks to present how people's attitudes change according to the religion of immigrants and how this affects the immigrants' citizenship process in the USA. In general, immigration is a controversial issue, for that reason people may conceal their real thoughts and have a tendency to give the socially accepted answers. For that reason, in this paper the list experiment method is used to get the real opinions of people. Results indicate that, people in fact conceal their real thoughts in response to direct survey questions. In addition, the results show that Americans are generally concerned about immigration. However, when it is compared to Muslim and Christian immigrants, people are more likely to support granting citizenship to a Christian immigrant compared to a Muslim immigrant. The other most important finding is that being against Muslim immigrants is considered more acceptable. In other words, people may feel pressure to say that they do not support Muslim immigration, for that reason when it is asked directly, some people (more than 10%) automatically say that they are against Muslim immigrants compared to the findings in the list experiment.
基金Supported by the NNSF of China (10371092,10771185) the Foundation of Whuan University
文摘The concepts of bi-immigration birth and death density matrix in random environment and bi-immigration birth and death process in random environment are introduced. For any bi-immigration birth and death matrix in random environment Q(θ) with birth rate λ 〈 death rate μ, the following results are proved, (1) there is an unique q-process in random environment, P^-(θ*(0);t) = (p^-(θ^*(0);t,i,j),i,j ≥ 0), which is ergodic, that is, lim t→∞(θ^*(0);t,i,j) = π^-(θ^*(0);j) ≥0 does not depend on i ≥ 0 and ∑j≥0π (θ*(0);j) = 1, (2) there is a bi-immigration birth and death process in random enjvironment (X^* = {X^*,t ≥ 0},ε^* = {εt,t ∈ (-∞, ∞)}) with random transition matrix P^-(θ^* (0);t) such that X^* is a strictly stationary process.
文摘Laos was once unique in Southeast Asia for its remarkably small overseas Chinese communities. Most of them fled this country when the communist forces seized power in 1975. Since Laos opened its economy in 1986, the Chinese in Laos have been able to develop in many areas. Especially, the visit of Premier LI Peng to Vientiane in 1990 marked a turning point in China-Laos relations. Unlike Cambodia, the reawakening of a Chinese community in Laos did not come from the Huaqiao, this arose from a new cycle of immigrants, who started pouring into northern Laos in the late 1990s at an unprecedented scale. Compared with other Southeast Asian nations, the Chinese in Laos are less in number and weaker in economic power. In this study, we focus on (1) Analysis the ways of the new Chinese immigrants in Laos; (2) Assess the role of new Chinese immigrants in the process of China increasing their influence in Laos and how Laos response to this issue; and (3) The trend of new Chinese immigrants in Laos in the near future. Firstly, the rapid of Chinese investment to Laos in the last two decades is the most important factor driving the Chinese migrants into this country. The first new Chinese immigrants arrived in the mid-1990s as workers or technicians on road construction projects and as part of the industrial cooperation between Yunnan and the northern provinces of Laos. Since the 2000s, China has been pouring aid and investment into Laos. Chinese companies are involved in almost all areas of this country's economy, from hydropower to mining, agriculture, service, and hospitality. The increasing of Chinese exports, investment, aids and Chinese contracted project constructions in Laos led to mass Chinese immigrants going to Laos to work in all the economic sectors which the Chinese are involved in this country. Most of them chose to stay on and started their own businesses. Secondly, the wave of new Chinese immigrants in Laos helps Chinese government to relieve the pressure of solving jobs for their citizens. The semi-skilled and unskilled labor can go to Laos to work for the Chinese companies. Moreover, the outflow of petty traders has been prompted by the oversupply of certain goods in China as well as intense domestic competition. The investors also can find the better developing business opportunities. Although, the increasing of new Chinese immigrants make the local society change so much. Some Laotians feel cautious about the presence of so many Chinese people in Laos. Thirdly, with the increasing of Chinese's influence in Laos, especially in the economic, the position of the Chinese community in Laos will grow stronger in both quantity and economic and political status. Assessing the trend of increasing of new Chinese immigrations in Laos and the growth of the Chinese community are seen by the Laos government creating favorable conditions for China's investment, commercial activity, tourism activities, and cultural exchanges.
文摘In a commercialized and fragment media market where crisis and humanitarian interventions are big news that sells, how do politicians and the public respond to them? Bearing in mind that immigration is a phenomenon with a growing presence in society and increasingly politicized, this paper explores an important and persistent question regarding the role of news media in affecting policy decisions, particularly during times of crisis (Paletz, 1998), transference of the issue and the media frames occurs. Having taken into account the agenda building paradigm and the concept of flame (Entman, 1993; Snow & Benford, 1988), the topic of immigration is analyzed in the Spanish main newspapers (El Pais & El Mundo) and in the political interventions (Parliamentary Debates). In order to implement this extraction and framing analysis, the associative method is adopted. The assaults of Ceuta and Melilla (2005) and the Canarias crisis (2006) are taken as the cases of study. The findings of this research highlight that moments of humanitarian crisis and key newsworthy events related to African immigrants increase the media's power to introduce the issue of immigration and to have influence on the frames used in the political and public agenda.
文摘US Latinos experience higher rates of obesity than their non-Latino counterparts. Factors associated with immigration, including length of residence in the United States, are associated with an increased risk of obesity. Latino community health workers (CHWs) work closely with communities, and are in an ideal position to provide insight on the underlying mechanisms of the Latino obesity epidemic. Focus groups were conducted with 15 CHWs and thematic analyses were performed to explore elements associated with obesity among Latino immigrants. Emergent themes included: reduction in physical activity due to less walkable spaces, more transportation options, and busier schedules in the United States. Interviewees also identified a sudden increase in access to unhealthy food and an abrupt reduction in access to, and affordability of, healthy food choices upon immigration. Culturally appropriate interventions to increase awareness of these factors and neutralize their effects among early Latino immigrants are recommended.
文摘In 1996, Congress enacted Illegal Immigration Reform and Immigrant Responsibility Act of 1996 (IIRIRA). Actually, it was a conservative legislation. It not only tightened border control but also strictly limited the public benefits about illegal immigration. Why Congress enacted serious immigration legislation in the 1990s? Generally speaking, economic factor and politics played an important role in it. In derails, several reasons can account for its conservatism: (1) The first reason is that the increase number of illegal immigration led to the high cost of state governments, many state governments complained it; (2) The second reason is the influence of 187 Act which deported illegal immigration in primary and high school and it produced chain effect for other states; (3) The third reason is political election, including Congress election and president campaign. 187 Act greatly influenced GOP (Grand Old Party) and Congress, which was controlled by GOP, tended to take serious measures to contain illegal immigrants. Did IIRRA work? In fact, it did not control illegal immigration. After 1990s, more and more illegal immigration entered into America and U.S, has become the nation with the most illegal immigrants in the world. Therefore, Congress should consider comprehensive immigration reform.