BACKGROUND Exposure to the particulate matter produced in underground railway systems is arousing increasing scientific interest because of its health effects. The aim of our study was to evaluate the airborne concentrations of PM10 and three sub-fractions of PM2.5 in an underground railway system environment in proximity to platforms and in underground commercial areas within the system, and t...

For millennia, mankind has been fascinated by the marvel of starry night sky. Yet, a proper scientific understanding how stars form, shine, and die is relatively recent achievement, made possible interplay different disciplines as well significant technological, theoretical, observational progress. We now know that are sustained nuclear fusion reactions furnaces where all chemical elements cont...

the aim of this study is to investigate underground water quality parameters in gorganrud river basin and their connection with aboveground conditions using gis and artificial neural networks. in order to prepare a land use map of the area, liss iii image of irs satellite of the year 2008 was used in a maximum likelihood classification. the results revealed that there was a significant correlat...

underground economy affects important indexes such as formal gdp, unemployment, consumption, production and etc. therefore it is necessary to identify elements and factors which affect underground economy to restrict it. surveys and studies indicate the size of iran’s underground economy is high and taxes, quantity and quality of regulations and performance of formal economy are the important f...

The paper presents a software agents society, which implements a more efficient control and monitoring system for a complex heterogeneous system – multiple hydroelectric power plants connected in a chain on Somes River. The agent society can be superimposed over the existing SCADA control and monitoring network and aims to increase performance, efficiency and stability in the existing monitorin...

By means of a Q-banding technique, virtually every chromosome in two heteroploid mouse cell lines, RAG and MSWBS, has been identified. The origin of 60 to 80% of the chromosomes has been established; the remaining chromo somes can be identified as markers characteristic of the cell line. The extent of chromosome heterogeneity has been ex amined and compared in these two mouse tumor cell lines. ...

1. Forest fragmentation often results in a matrix of open areas mixed with patches of forest. Both biotic and abiotic factors can affect consumer species' ability to utilize the altered habitat, especially for species that range over large areas searching for prey. 2. Army ants (Formicidae: Ecitoninae) are highly mobile top predators in terrestrial Neotropical ecosystems. Army ant foraging beha...

Underground coal gasification (UCG) is a clean mining technology without significant environmental impacts. This can also be used in deep, hard-to-reach seams or deposits affected by tectonic disturbances, where conventional impossible. Several techniques and methods have been investigated worldwide to support the process control of UCG. Global research focuses on UCG operating parameters stabi...