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101.
PM10 airborne particles and soot deposit collected after a fire incident at a chemical store were analyzed in order to determine the concentrations of polycyclic aromatic hydrocarbons(PAHs). The samples were extracted with 1 : 1 hexane-dichloromethane by ultrasonic agitation. The extracts were then subjected to gas chromatography-mass spectrometric(GC-MS) analysis. The total PAHs concentrations in airborne particles and soot deposit were found to be 3.27 1.55 ng/m^3 and 12.81 24.37 μg/g, respectively. Based on the molecular distributions of PAHs and the interpretation of their diagnostic ratios such as PHEN/(PHEN ANTH), FLT/(FLT PYR) and BeP/(BeP BaP), PAHs in both airborne particles and soot deposit may be inferred to be from the same source. The difference in the value of IP/(IP BgP) for these samples indicated that benzo[ g, h, i] perylene and coronene tend to be attached to finer particles and reside in the air for longer periods. Comparison between the molecular distributions of PAHs and their diagnostic ratios observed in the current study with those reported for urban atmospheric and roadside soil particles revealed that they are of different sources. 相似文献
102.
A good estimate of the design effect is critical for calculating the most efficient sample size for cluster surveys. We reviewed the design effects for seven nutrition and health outcomes from nine population-based cluster surveys conducted in emergency settings. Most of the design effects for outcomes in children, and one-half of the design effects for crude mortality, were below two. A reassessment of mortality data from Kosovo and Badghis, Afghanistan revealed that, given the same number of clusters, changing sample size had a relatively small impact on the precision of the estimate of mortality. We concluded that, in most surveys, assuming a design effect of 1.5 for acute malnutrition in children and two or less for crude mortality would produce a more efficient sample size. In addition, enhancing the sample size in cluster surveys without increasing the number of clusters may not result in substantial improvements in precision. 相似文献
103.
Afzal Jamil Yihong Zhou Qayum Maria Afzal Usama Aslam Muhammad 《Environmental science and pollution research international》2023,30(6):14592-14603
Environmental Science and Pollution Research - Dams are studied not only for potential advantages but also for possible environmental repercussions. The objective of this case study is to see the... 相似文献
104.
Jamil Barkat Yaping Shen Ud Din Nizam Nazneen Shama Mushtaq Anila 《Environmental science and pollution research international》2021,28(37):51278-51296
Environmental Science and Pollution Research - Environmental degradation is being studied by linking with various factors depending upon the interest of researchers. Our interest is in... 相似文献
105.
Al-Shidi Hilal K. Sulaiman Hameed Al-Reasi Hassan A. Jamil Farrukh Aslam Muhammad 《Environmental science and pollution research international》2021,28(26):33980-33993
Environmental Science and Pollution Research - Heavy metal contamination of Hg, As, Cu, Cr, Zn, and Pb was investigated in three different fractions 45, 125, and 200 μm of road dust... 相似文献
106.
Aziz Tariq Ullah Asmat Fan Hong Jamil Muhammad Imran Khan Farman Ullah Ullah Roh Iqbal Mudassir Ali Amjad Ullah Bakhtar 《Journal of Polymers and the Environment》2021,29(11):3427-3443
Journal of Polymers and the Environment - This paper presents the effects of silane coupling agent, which includes interfacial adhesive strength, water treatment, polymer composites and coatings... 相似文献
107.
Karin C.H.J. Smolders Yvonne A.W. de Kort Ariadne D. Tenner Florian G. Kaiser 《Journal of environmental psychology》2012
At work, people may experience fatigue and a depletion of mental resources. The subsequent need for recovery is generally assessed employing subjective reports on evaluative statements. In this paper, we explore whether it is possible to assess employees’ recovery needs with a systematic inspection of behaviors. The idea is based on Campbell’s paradigm (Kaiser, Byrka, & Hartig, 2010), which holds that individuals will perform more, and more difficult behaviors to recover from fatigue when their need for recovery is higher. 相似文献
108.
Jamil M. Bakhashwain 《International Journal of Green Energy》2016,13(14):1467-1472
This article utilizes Support Vector Machines (SVM) for predicting global solar radiation (GSR) for Sharurha, a city in the southwest of Saudi Arabia. The SVM model was trained using measured air temperature and relative humidity. Measured data of 1812 values for the period from 1998–2002 were obtained. The measurement data of 1600 were used for training the SVM, and the remaining 212 were used for comparison between the measured and predicted values of GSR. The GSR values were predicted using the following four combinations of data sets: (i) Daily mean air temperature and day of the year as inputs, and global solar radiation as output; (ii) daily maximum air temperature and day of the year as inputs, and GSR as output; (iii) daily mean air temperature and relative humidity and day of the year as inputs, and GSR as output; and (iv) daily mean air temperature, day of the year, relative humidity, and previous day’s GSR as inputs, and GSR as output. The mean square error was found to be 0.0027, 0.0023, 0.0021, and 7.65 × 10?4 for case (i), (ii,), (iii), and (iv) respectively, while the corresponding absolute mean percentage errors were 5.64, 5.08, 4.48, and 2.8%. Obtained results show that the SVM method is capable of predicting GSR from measured values of temperature and relative humidity. 相似文献
109.
Sadaf Sadia Arain Tasneem Gul Kazi Hassan Imran Afridi Kapil Dev Brahman Naeemullah Sumaira Khan Abdul Haleem Panhwar Muhammad Afzal Kamboh Jamil R. Memon 《Environmental monitoring and assessment》2015,187(5):309
The present study was aimed to evaluate the cadmium (Cd) and lead (Pb) levels in the blood samples of adolescent boys, chewing different smokeless tobacco (SLT) products in Pakistan. For comparative purpose, boys of the same age group (12–15 years), not consumed any SLT products were selected as referents. To determine trace levels of Cd and Pb in blood samples, a preconcentration method, vortex-assisted liquid–liquid microextraction (VLLME) has been developed, prior to analysis by flame atomic absorption spectrometry. The hydrophobic chelates of Cd and Pb with ammonium pyrrolidinedithiocarbamate were extracted into the fine droplets of ionic liquid (IL) 1-butyl-3-methylimidazolium hexafluorophosphate, while nonionic surfactant, Triton X-114 was used as a dispersing medium. The main factors affecting the recoveries of Cd and Pb, such as concentration of APDC, centrifugation time, volume of IL and TX-114, were investigated in detail. It was also observed that adolescent boys who consumed different SLT products have 2- to 3-fold higher levels of Cd and Pb in their blood samples as compared to referent boys (p?<?0.001). 相似文献