A popularity café in Baghdad city was chosen to measure the dispersion of nitrogen dioxide (NO 2) and carbon monoxide (CO) as examples of the Indoor Air Pollutants (IAPs) which are considered a significant environmental problem. The aims of this research were, firstly, to measure the variation of NO 2 and CO concentrations; secondly, to examine the effect of the seasonal variation of indoor temperature (°C) and relative humidity (%) on the dispersion of both NO 2 and CO and finally to compare the results with those of the global standards. The volume of café was about 360 m 3 and the number of smokers was about 25-35 smoker/day. This work was divided into two parts where the first part includes the experimental work which comprised the measurement of NO 2 and CO by GIGs devices. It was lasted about five months commencing from November 2017 to March 2018 and the readings were taken during two intervals at partial time and during peak time. The second part includes the analysis of obtained results and compared the results of those of the global standards for the Indoor Air Quality suggested by WHO, EPA, and European criteria in order to achieve the goals of this work. The results from this research have highlighted a clear increase in the concentrations of NO 2 and CO along with the growing numbers of smokers. Furthermore, the concentrations of NO 2 and CO were close to some global standard values of short-term exposure at peak time.

This research aimed to find the best-operating conditions for incorporating the GO material into PES/GO membranes for the NF applications. Organic dye molecules may foul GO-NP/PES membranes. The improved model aimed to reduce the energy lost while maintaining a high system discharge throughout the treatment process in order to face the technical problems that the membranes are exposed to. To create a particular amount of flux above the intended values, an optimization approach was used to find the optimal values for several important parameters in the process. To enhance the process effectiveness on a broader scale, mathematical and statistical studies, such as response surface methodology and statistical analysis of the parameters (ANOVA), were applied. The impact of operational factors, like the pH values of the dye feeding (3-11), GO weight content (0-2 wt.%), dye concentration (10-100 ppm) of AB-210, and the interfaces for these factors with the PES/GO membrane permeability was examined. The PES membrane had the best performance, with a result of 131.2338 L•m -2 •h -1 •bar -1 . The pH did not influence the AB-210 dye reaction, and the Pareto chart of the standardized effects on dye permeation flux using statistical comparison at the 5% significance level supports these findings.

This study focuses on the design of a lightweight cement mortar with recycled fine aggregates of wood, plastic, and glass. The normal fine aggregate (sand) was replaced with 20%, 40%, and 60% by weight of sand of recycled aggregates, prepared by cleaning wood sawdust, broken plastic, and broken glass with mechanical milling and then using a mill to obtain a similar gradation to that of the sand. The main goal of this paper was to study the effects of using these recycled aggregates on acoustic and thermal properties as compared with those of the reference cement mortar. Acoustic insulation tests were thus carried out on samples with dimensions of 23 × 23 × 0.8 cm prepared for this purpose at the age of 28 days, with three models for each replacement ratio. The acoustic isolation results showed that cement mortar with sawdust at replacement ratios 20%, 40%, and 60% showed better acoustic isolation properties than cement mortar with plastic and glass with the same replacement percentages or ordinary cement mortar. The thermal insulation of the samples was tested in samples with dimensions of 10 × 5 × 2 cm at 28 days. The results for thermal conductivity coefficients were 0.2353 W.m-1K-1, 0.1981 W.m- 1K-1, and 0.1609 W.m-1K-1 for the replacement ratios 20%, 40%, and 60%, respectively. These results show that the cement mortar with sawdust offered less thermal insulation than cement mortar with plastic debris, while cement mortar with crushed glass was even less thermally isolated.

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