polycyclic aromatic hydrocarbons (pahs) which are toxic pollutants are released by various sources of urban combustion. ahvaz in iran with around a million population and the industrial and oil centers, has encountered air quality problems. samples of dibenzo (a,h) antheracen were collected from six stations in ahvaz particle and gas phase in summer 2010. dibenzo(a,h) antheracen were collected ...

vehicle exhaust is a major source of exposure to polycyclic aromatic hydrocarbons (pahs) found in the urban atmosphere. newsagents usually work close to heavy traffic flow. the purpose of this study was to assess the breathing zone exposure of newsagents to pahs found in the urban atmosphere of tehran city during summer and autumn seasons and comparing the levels of exposure in both seasons.fif...

In the Brazilian context regarding sale of fuels, an energy matrix paramount importance and essential for country's economic movement, National Agency Petroleum, Biofuels Natural Gas regulates quality safety standards refining, distribution retail, thus, Consumer Defense Code complements issues by directing legislation aimed at use deployment these flammable materials in national territory. Thi...

An overview of research activity in the area of powering base station sites by means of renewable energy sources is given. It is shown that mobile network operators express significant interest for powering remote base stations using renewable energy sources. This is because a significant percentage of remote base station sites on the global level are still diesel powered due to lack of connect...

It was made clear that many railway customers thought the major important factors which influence comfort of stations were “odors” and “clearness of air”. We also found that there was a high correlation between the evaluation of customers about odors and the amount of fungi floating in the air at several points of stations. So we consider that microbial volatile organic compounds (MVOCs) genera...

Air samples were collected simultaneously at platform, mezzanine and outdoor in five typical stations of subway system in Shanghai, China using stainless steel canisters and analyzed by gas chromatography-mass selective detector (GC-MSD) after cryogenic preconcentration. Benzene, toluene, ethylbenzene and xylenes (BTEX) at the platforms and mezzanines inside the stations averaged (10.3 +/- 2.1)...

This paper presents three heuristic algorithms that solve for the optimal locations for refueling stations for alternative-fuels, such as hydrogen, ethanol, biodiesel, natural gas, or electricity. The Flow Refueling Location Model (FRLM) locates refueling stations to maximize the flow that can be refueled with a given number of facilities. The FRLM uses path-based demands, and because of the li...

The article is devoted to the current task of selecting pre-training parameters for synthesis surrogate models, which a key factor in creating high-performance models complex technological objects. During study, authors conduct systematic analysis various and their interactions, including determining optimal number training iterations, trainable layers, neurons these layers. Thanks this approac...

The life in the 21st century carries the consequence of using many goods and conveniences of the technocratic world. Doubtless, electric energy is one of such good. According to the principle of conservation of energy, we have to use different sources of energy with the aim of production of electric current. Most frequently the energy contained in mineral fuels or nuclear energy is being used [...