نتایج جستجو برای: urban population will reach 70 percent in 2050urban areas
تعداد نتایج: 17133563 فیلتر نتایج به سال:
By the year 2025 about 61% of the world’s population will be living in urban areas, especially in developing countries. The urban population will double from 2.4 billion in 1995 to 5 billion in 2025. The world’s urban population is growing 2.5 times faster than the rural population. The impact on health in the urban conglomerations is visible with a significant spread of communicable diseases o...
chapter one is devotod to collect some notion and background informations, which are needed in the next chapters. it also contains some important statements which will be proved in a more general context later in this thesis. in chapter two, we show that if the marginal factor-group is of order np1...pk,n>1, then we obtain a bound for the order of the verbal subgroup. also a bound for the bear-...
Concerning the population growth and urban development, significant growth in the rate of personal car usage has caused more transportation and thus growth in occupying the street areas for parking vehicles. This has caused much transporting problems and traffic. Hence concerning the parking issue is crucial in traffic and municipal management.The important issue is the suitable place for the p...
This paper adopts the PM2.5 concentration data obtained from 1497 station-based monitoring sites, population and gross domestic product (GDP) census data, revealing population exposure and economic effects of PM2.5 in four typical urban agglomerations of China, i.e., Beijing-Tianjin-Hebei (BTH), the Yangtze River delta (YRD), the Pearl River delta (PRD), and Chengdu-Chongqing (CC). The Cokrigin...
introductionpopulation data is easily accessible and shows the relationship between city size and other socio-economic factors in the city indirectly, so many geographers using this type of data to gain an understanding of the structure of the cities network and distribution of the people in the different levels of urban hierarchy. in fact, urban hierarchy is the best way of space organization ...
extended abstract 1. introduction the investigation of land cover and land use changes has been important since ancient eras and these changes mainly occur in two ways: the first types of these changes take place by the means of natural factors such as erosion, tectonic forces and floods and the second types take place by human factors. in recent years in many parts of the world, human oriented...
Urbanization is defined by the United Nations as the movement of people from rural to urban areas, whose population is projected to amount to half of the world’s population in 2008, rising to about 60% in 2030. As an increasingly higher number of people leave farms and villages to live in cities particularly in the developing countries, urban centres will grow at a rate previously unseen in man...
BACKGROUND Social inequality in child survival hampers the achievement of Millennium Development Goal 4 (MDG4). Monitoring under-five mortality in different social strata may contribute to public health policies that strive to reduce social inequalities. This population-based study examines the trends, causes, and social inequality of mortality before the age of five years in rural and urban ar...
At the turn of 21st century, urban development has experienced a paradigm shift so that quest for smarter cities become priority agenda, with direct participation industry, policy makers, practitioners, and scientific community alike. The 2008 financial crisis, exodus from rural areas, densification centers coupled environmental sustainability concerns posed enormous challenges to municipalitie...
The percentage of the population in urban areas has increased by ten points from 2000 (46%) to 2020 (56%); it is expected reach up 70% 2050. This undoubtedly will encourage society use alternative transports. On other hand, widespread fear pandemics seems be here stay, and causing most people leave public transport private cars, a few have chosen unipersonal electric vehicles. As consequence, d...
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