what is called the problems of tehran metropolis now a days, is deep- rooted in the policies ofurban planning in our country. since not far past up to now, immigration from all over the country to tehran, irregular growth of urban population, inconsistency with urban infrastructure development, environmental pollution and low quality of living areas, erosion of self -growing fabric in most area...

Researchers have suggested that perceptions of discrimination may vary depending on place of birth and the length of time spent living in the U.S., variables related to acculturation. However, the existing literature provides a mixed picture, with data suggesting that the effects of acculturation on perceptions of discrimination vary by race and other sociodemographic factors. This study evalua...

This study examined the relationships among cognitive variables, family immigration history, negative life events, and depressive symptoms in a sample of 306 low-income, urban fifth- and sixth-grade children. Explanatory style and negative automatic thoughts were the cognitive variables examined. There were three key findings. First, children who were immigrants reported significantly more depr...

Migratory birds often follow detours when confronted with ecological barriers, and understanding the extent and the underlying drivers of such detours can provide important insights into the associated cost to the annual energy budget and the migration strategies. The Qinghai-Tibetan Plateau is the most daunting geographical barrier for migratory birds because the partial pressure of oxygen is ...

Climate-induced phenological shifts can influence population, evolutionary, and ecological dynamics, but our understanding of these phenomena is hampered by a lack of long-term demographic data. We use a multi-decade census of 5 salmonid species representing 14 life histories in a warming Alaskan stream to address the following key questions about climate change and phenology: How consistent ar...

Immigration, Citizenship, and the Size of Government This paper analyzes the political sustainability of the welfare state in an environment where immigration is the main demographic force and where governments are able to influence the size and skill composition of immigration flows. Specifically, I present a dynamic politicaleconomy model where both income redistribution and immigration polic...

This paper analyzes the recent mass immigration from the USSR to Israel. We examine three interrelated features of the assimilation process; the rise in the productive capacity of immigrants as they gradually adapt to the Israeli labor market, the rising rewards that immigrants receive for their imported skills and the role of the family in facilitating the acquisition of local skills. We estim...

Migration as a human phenomenon has some consequences and repercussions. One of these effects is crime commitment and inducing disturbance in land and national security in immigrants' residence country, in other word, international migration, especially illegal migration, have different penal-security effects. Finding reason that the permeability of borders and increasing illegal traffic, drug ...