OBJECTIVES The present study aimed to assess the risk of cancer due to benzene in the ambient air of gas stations and traffic zones in the north of Tehran. The cancer risk was estimated using the population distribution data for benzene levels and the unit risk for benzene proposed by the United States Environmental Protection Agency (US EPA). MATERIAL AND METHODS Sixteen sampling locations w...

Diode laser absorption spectroscopy provides a direct method of determinating species concentration and local gas temperature in combustion flames. Under microgravity conditions, diode lasers are particularly suitable, given their compact size, low mass and low power requirements. The development of diode laser-based sensors for gas detection in microgravity is presented, detailing measurements...

Muon tomography (MT) based on the measurement of multiple scattering of atmospheric cosmic ray muons traversing shipping containers is a promising candidate for identifying threatening highmaterials. Since position-sensitive detectors with high spatial resolution should be particularly suited for tracking muons in a MT application, we propose to use compact micro-pattern gas detectors, such as ...

Liquefied petroleum gas (LPG) is an important urban gas source in China. Before supplied to customers by pipeline supply systems, LPG is stored in tanks in LPG vaporization stations. Designers usually decide the number and the size of storage tanks by their experience during constructions of vaporization stations. These decisions are usually not best and most economical. To solve the problem, a...

Semiconductor gas sensors are widespread in application, e.g. for the detection of methane in city gas or carbon monoxide from incomplete combustion [1]. Due to the involved chemistry a sensor element does not react to just one gas component, but with different sensitivities to different gas components. Sensor elements prepared with different additives and different operating temperatures respo...

This study was carried out in the city of Tikrit and its environs, where environmental pollution with lead studied some governmental fuel stations Salah al-Din Governorate, cars often gather for refueling, resulting vehicle exhausts varying proportions pollutants emitted from them, including element lead.
 The divided to include five sites, four gas a fifth group control, which are: old st...

aid uses, including fire stations, according to critical activities that are responsible, in comparison to other city services, are more important. identify areas where are located outside of the fire stations covered services can help urban planners to site selection of this important land use. the purpose of this paper is detection the areas that are beyond the services coverage of the fire s...

The toxicity of benzene, a chemical used in many industrial processes, involves bone marrow depression and leukemogenesis and is associated with damage to multiple classes of hematopoietic cells and hematopoietic functions. Environmental exposure to benzene causes an increased body burden, which is reflected in several biomarkers, eg, urine trans,trans-muconic acid (ttMA). Associated with the i...