Results 11 to 20 of about 309,205 (308)
Frontiers in Ecology and Evolution, 2023 IntroductionUrban human settlements' spatial network structures have emerged as crucial determinants impacting their health and sustainability. Understanding the influencing factors is pivotal for enhancing these settlements.
Rui Song +8 more
doaj +1 more source
Allocating vaccines to remote and on-site workers in the tradable sector
Scientific Reports, 2022 Vaccination may be the solution to the pandemic-induced health crisis, but the allocation of vaccines is a complex task in which ethical, economic and social considerations are important.
László Czaller +2 more
doaj +1 more source
Urban hierarchy and spatial diffusion over the innovation life cycle
Royal Society Open Science, 2022 Successful innovations achieve large geographical coverage by spreading across settlements and distances. For decades, spatial diffusion has been argued to take place along the urban hierarchy.
Eszter Bokányi +3 more
doaj +1 more source
Air Pollutants Sources in Winter in Chang-Zhu-Tan Region of China
Advances in Meteorology, 2022 In order to analyze the primary sources of air pollutants in Chang-Zhu-Tan region, this article selected the environmental monitoring data and meteorological data in the winter of 2019 to calculate the backward airflow trajectories with the Chang-Zhu-Tan
Yingfang Zhu +6 more
doaj +1 more source
Spatial Distribution of Exhalation Droplets in the Bus in Different Seasons
Aerosol and Air Quality Research, 2021 In closed buses, the spread of droplets with viruses/bacteria may cause the spread of respiratory infectious diseases. Discrete phase modeling is used to simulate the diffusion characteristics and concentration distribution of droplets at different ...
Wenzhu Duan +5 more
doaj +1 more source
SSRN Electronic Journal, 2003 This paper considers the racetrack economic approach, where manufacturing activities are distributed continuously. We seek constant-access equilibria and show that smooth equilibrium distributions are always unstable for almost all transport cost functions, whereas agglomeration in 1 or 2 atomic cities is stable for any economic parameters given ...
PICARD, Pierre, TABUCHI, Takatoshi
openaire +3 more sources
Agglomeration and Innovation [PDF]
SSRN Electronic Journal, 2014 This paper reviews academic research on the connections between agglomeration and innovation. We first describe the conceptual distinctions between invention and innovation. We then discuss how these factors are frequently measured in the data and note some resulting empirical regularities.
Carlino, Gerald, Kerr, William
openaire +5 more sources
The agglomeration of headquarters [PDF]
Regional Science and Urban Economics, 2008 This paper uses a micro data set on auxiliary establishments from 1977 to 1997 in order to investigate the determinants of headquarter agglomerations and the underlying economic base of many larger metro areas. The significance of headquarters in large urban settings is their ability to facilitate the spatial separation of their white collar activities
J Vernon Henderson, James Davis
openaire +1 more source
Heterogeneous Agglomeration [PDF]
Review of Economics and Statistics, 2017 Many prior treatments of agglomeration explicitly or implicitly assume that all industries agglomerate for the same reasons. This paper uses UK establishment-level coagglomeration data to document substantial heterogeneity across industries in the microfoundations of agglomeration economies.
Giulia Faggio +2 more
openaire +5 more sources
Kuangchan zonghe liyong, 2023 This is an essay in the field of mineral processing engineering. In China, fluorite mainly exists in the form of concomitant deposits. In the flotation process, other useful minerals are usually preferentially floated, and a large amount of fluorite ...
Zhehui Yang +5 more
doaj +1 more source