As an air pollutant is transported from a source to a potential receptor the pollutant disperses into the surrounding air so that it arrives at a much lower concentration than it was on leaving the source. Strict environmental regulations worldwide resulted in an ever growing concern about the validity and reliability of air quality dispersion models. The present work is a try to evaluate the a...

The aim of this study is to investigate the problems caused by discharge of polluted air from tunnels into the environment with a specific focus on residential areas. In city tunnels, portal or stacks, pollutant management is a big challenge. Nowadays, air quality management, particularly in urban tunnels, is considered as a part of the ventilation system design. The goal is to see the environm...

We develop an equilibrium directed search model of the labor market where workers can simultaneously apply for multiple jobs. Our main theoretical contribution is to integrate the portfolio choice problem faced by workers into an equilibrium framework. All equilibria of our model exhibit wage dispersion. Consistent with stylized facts, the density of wages is decreasing and higher wage firms re...

A selection of illustrative examples is used in reviewing wind tunnel and water tank modelling of atmospheric dispersion, the aim being to discuss cases where the laboratory work has been a key factor in developing scientific understanding and instigating further research. The areas included are: basic dispersion processes, plume rise, buildings effects, urban areas, dense gas dispersion, conce...

In the developing process of urbanization in China, PM2.5 pollution has become a problem that must be faced. Greenway, especially those in the community, is the important green infrastructure to improve ecological environment in urban areas, which plays a crucial role in PM2.5 reduction. With basic cognitive analysis on definitions and characteristics of community greenway and PM2.5, this paper...

This paper presents computational simulations of atmospheric dispersion experiments conducted around isolated obstacles in the field. The computational tool used for the simulations was the code ADREA-HF, which was especially developed for the simulation of the dispersion of positively or negatively buoyant gases in complicated geometries. The field experiments simulated involve a single cylind...

This paper develops a series of simple heterogeneous-agents economies in order to study the welfare implications of labor market inequality. We perform two types of welfare calculations. First we compute the welfare cost of a rise in labor market risk, given a particular asset market structure (complete markets, incomplete markets, autarky). Second, we compute the expected gain from completing ...

INTRODUCTION The objective of this study is the evaluation of model sensitivity due to grid size and resolution variation in complex terrain by the design of a screening experiment. Grid calibration, that in many cases involves the removal of complexities and insignificant terms, is the starting point in reducing meteorologically affected factors of uncertainty before any pollution predictions ...

Yaping Xiao, Daniel J. Jacob, Solene Turquety Department of Earth and Planetary Sciences and Division of Engineering and Applied Sciences, Harvard University, Cambridge, MA Short title: global acetylene budget and C2H2-CO correlation

The ANTARES underwater neutrino telescope, at a depth of 2475 m in the Mediterranean Sea, near Toulon, is taking data in its final configuration of 12 detection lines. Each line is equipped with 75 photomultipliers (PMT) housed in glass pressure spheres arranged in 25 triplets at depths between 100 and 450 m above the sea floor. The PMTs look down at 45 to have better sensitivity to the Cherenk...