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Showing 4 results for Abdolahnejad

Negar Jafari, Bijan Bina, Soheila Mortezaie, Afshin Ebrahimi, Ali Abdolahnejad,
Volume 7, Issue 5 (2-2012)
Abstract

Background: To prevent the adverse health effects of noise pollution and to achieve the recommended standards, assessment of noise levels in the cities is essential. The aim of this study was to evaluate noise pollution levels (NPLs) in Isfahan, Iran and compare them with recommended standard values. Materials and Methods: A total number of 19 measurement points were selected from most congested areas throughout the city. Environmental noise parameters such as L10, L50, L90, L95, L99, Leq, SEL, SPL, Lmin, Lmax, and Lpeak were measured using a CEL-440 sound level meter. NPL and traffic noise index (TNI) were calculated by mathematical formulas. All measurements were carried out twice a day (morning and afternoon with 30 minutes intervals. Finally, the average results were reported. Results: The maximum Leq was at Ferdowsi Crossroads in the morning (78.3 dB) and at Jomhoori Square in the afternoon (79.6 dB). The mean measured Leq level was 74.5 ± 2.78 dB in the morning and 72.6 ± 4.43 dB in the afternoon. Significant differences with the standard values were seen between average equivalent sound levels both in the morning and afternoon (P < 0.001). In other words, the obtained Leq levels were higher than standard. Furthermore, there was a correlation between the calculated NPL and TNI in the morning and afternoon (Pearson's correlation coefficient = 0.877, P < 0.001(. Conclusion: It can be concluded that Isfahan is an environmentally noise polluted city. In most cases, the noise levels exceed the recommended levels by Iranian Environmental Protection Organization.
Negar Jafari, Bijan Bina, Soheila Mortezaie, Afshin Ebrahimi, Ali Abdolahnejad,
Volume 8, Issue 3 (8-2012)
Abstract

Background: The comfort of patients during their stay in the hospital is important, and noise pollution exceeding the permissible level could cause discomfort for the patients and intensify their disease. Moreover, increase in this factor affects the hospital staff and therefore has a negative effect on how they serve the patients. Thus, the aim of this study was to assess the environmental noise pollution in Feiz Hospital wards and its adjacent area, and compare them with recommended standard values. Methods: This cross-sectional study was carried out in 2011. To measure sound levels, the environmental noise parameters such as L10, L50, L90, L95, L99, Leq, SEL, SPL, Lmin, Lmax, were measured using the CEL-440 sound level meter. Measurements were conducted during 8-12 a.m. and 16-20 p.m. with half an hour interval. Findings: The maximum equivalent sound level (Leq) in the clinical section in the morning, and in the official section of the hospital in the afternoon were 66.72 and 65.80 dB (A), respectively. The averages of Lmax, Leq, SEL, and L10 in the morning were 61.87, 58.17, 61.50, and 60.62 dB, respectively, and those of in the afternoon were 69.67, 62.06, 71.58, and 64.87 dB, respectively. Conclusion: Statistical analyses showed a significant difference between measured values in the morning and the afternoon (P < 0.001). In other words, the mean index values in the afternoon were higher than in the morning. It can be concluded that Feiz Hospital has a high level of noise pollution, and in most cases the noise levels exceeded the levels recommended by the Iranian environmental protection agency.
Ali Abdolahnejad, Alireza Kamali, Amir Mohammadi, Effat Shabanian, Yaghob Hajizadeh, Afshin Ebrahimi, Negar Jafari,
Volume 13, Issue 3 (10-2017)
Abstract

Background: Today, interurban buses play an important role in transferring passengers between cities. Contaminated drinking water in buses will threaten the health of travelers. This study investigated the microbial and chemical quality of drinking water supplied in the coaches transporting passengers from/to Soffeh Terminal in Isfahan, Iran.Methods: In this study, 60 samples of potable water supplied in the coaches were randomly collected. Bacterial contamination of the samples was examined using most probable number (MPN) method through multiple tube method. Chemical parameters including lectrical conductivity (EC), total dissolved solids (TDS), total hardness, chlorine, turbidity, pH, and temperature were measured according to the standard methods. Data were analyzed using SPSS software.Findings: The results showed that total coliform and fecal coliform were positive in 20% and 7% of the samples, respectively, and all contaminations were related to water dispensers. About 35% of the samples had EC levels of higher than the recommended standard (500 µmhos/cm2). The turbidity value was higher than 1 Nephelometric Turbidity Unit (NTU) in 11.6% of the samples and residual chlorine was 0 in 98.3% of the samples.Conclusion: This study showed that most samples of potable water served to the passengers via chillers installed in the coaches were contaminated with fecal coliforms. However, this pollution was not observed in the bottled potable water available inside the coaches. Thus, collecting the tap equipped-chillers and supplying only bottled potable water in all the coaches can prevent intestinal diseases in passengers.
Ali Abdolahnejad, Elham Shirdel, Shahin Raesivand, Afshin Ebrahimi, Negar Jafari,
Volume 14, Issue 3 (10-2018)
Abstract

Background: The high consumption of nitrogen-containing fertilizers in agricultural lands of Freidan Township, Iran, is resulted to increasing of the nitrate concentration in drinking water in some of the underground water wells, even higher than allowed amount. Therefore, the aim of this study was to survey and zone nitrate concentration in groundwater resources in Freidan using the geographic information system (GIS).Methods: In this was an analytical-cross sectional study, nitrate concentration was determined using spectrophotometry according to standard method, and compared with World Health Organization (WHO) guideline (50 mg/l). Then, zoning of nitrate concentration in groundwater resources of Freidan was investigated using Inverse Distance Weighting (IDW) and Kriging methods via ArcGIS software.Findings: In half of the wells in Freidan, nitrate concentration was higher than the WHO guideline. Moreover, nitrate concentration zoning by GIS in groundwater resources showed that the wells with high nitrate were located in central and southern regions of Freidan.Conclusion: Improper irrigation methods and excessive use of nitrogen fertilizers by untrained farmers can increase nitrate in groundwater resources. So, arrangements for farmers training related to reduction of these fertilizers consumption should be considered. 

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