s. e. hashemi

Large volumes of contaminated industrial wastewater have caused growing concern among researchers and environmentalists. Benzene, toluene, ethylbenzene, xylene, and styrene (BTEXS) cyclic hydrocarbons in industrial effluents are often completely stable to biodegradation and must be treated before disposal. In this context, using adsorption processes is a potential alternative for treating a wide range of organic pollutants, especially aromatic compounds in industrial wastewater. This study investigated the preparation of MCM-41 from silica; extracted from rice husk ash; MCM-41 was green synthesized to evaluate the effect of mesoporous used in BTEXS removal of an aqueous medium using the Taguchi method. The aqueous solution contains cyclic hydrocarbons was synthetically prepred based on real industrial effluent in concentrations of 50, 100, and 150 mg/l using MCM-41 catalysts, in doses of 0.1, 0.5, and 1g, at different pH values. In the present study, the optimum results obtained by Taguchi method analysis were pH =11, for duration of 60 minutes, the concentration of cyclic hydrocarbon solution BTEXS 100 mg/l, and nanoparticle dose of 0.5 g. The maximum BTEXS removal of 77.36% was achieved by the use of hydrogen peroxide.

Today, problems such as global climate change and its consequences such as floods, droughts, melting glaciers, ocean water level rise are considered globally, and actions should be taken immediately to contain these problems. Many sources pointed to the positive aspects of using organic matter such as biochar to retain soil moisture and plant nutrients, reducing nitrate leaching and greenhouse gas emissions. Biochar is a carbon-rich compound produced by pyrolysis of natural organic matter. In the present study, 0% biochar (B1), 2.5% biochar (B2), 5% biochar (B3), and 7.5% biochar (B4), 2.5% wheat straw (W1), and 5% straw (W2) were added to soil with clay loam texture (S1) and sandy loam soil (S2). This pot experiment was implemented based on a completely randomized design in three replications in the greenhouse using 15N Isotope tracing method. Due to biochar application, Crop yield and nitrogen fertilizer use efficiency increased. This increase was particularly significant in S1B4 treatment (P < 0.01) and reached up to 35%. Straw reduced nitrogen fertilizer utilization in S1W2 and S2W2 treatments by 94% and 87%, respectively

In this research, we present a mathematical model for allocating people to different jobs and shifting employees between related jobs. This action will reduce the repetitive activities workload and ergonomic risks at the planned time horizon, and finally increases the organization's efficiency. In this proposed model, the devices are semi-automatic and it is possible to allocated more than one task to one person. Regarding the modeling and the case study of the constraints, it is shown that the complexity of this problem type is NP-Hard, and the result of accurate methods for solving the problem is not possible in a reasonable time. Due to this Simulated Annealing (SA) algorithm is used to study the proposed model and comparison of the results of SA algorithm with the results of precise optimization methods shows the better performance of the Simulated Annealing algorithm in terms of the time and answer quality.

Since choosing mode of delivery is one of the most important choices in a woman's life, the factors affecting this choice are necessary to be considered. In recent years, the effect of various psychological factors on attitude towards delivery has been considered. One of these factors is the mother's perceived stress. Therefore, this study was conducted to determine the relationship between perceived stress and attitude towards delivery and choosing mode of delivery among pregnant women.
This prospective cohort study was conducted among 305 pregnant women who were at week 32 of their pregnancy or above who referred to selected health centers of Ahvaz in 2016. "Demographic information", "Perceived stress" and "Attitude towards mode of delivery" were collected using a questionnaire. Perceived stress score was from zero to 56 (higher score indicates higher perceived stress), and attitude towards delivery score was from 68 to 204 (higher score indicates more positive attitude towards delivery).
FINDINGS: The mean perceived stress score in subjects with positive, neutral and negative attitudes toward delivery were 27.08±10.86, 25.70±8.82 and 22.36±15.14, respectively, and in women with virginal and cesarean deliveries were 26.45±10.18 and 25.24±10.44, respectively. There was no significant correlation between perceived stress and attitude towards delivery (p=0.22) and choosing mode of delivery (p=0.49).
The results of the study showed that there is no relationship between perceived stress and attitude towards delivery and choosing mode of delivery.

the results of various researches show that thrive employees, more passion and vitality, higher motivation, more mental health, less job quit, and reduced symptoms of physical illnesses are sought. Thriving at work does not only bring about better performance, but also leads people to their duty and help others. The purpose of this study was to investigate the role of thriving at work in the relationship between Contextual Enablers with on job performance and organizational citizenship behavior. The methodology of the present study is applied in terms of the purpose of data collection in a survey type and in terms of data analysis is descriptive-analytic. The statistical population consisted of all employees of an industrial company who were employed in the company in 1395, of which 211 were randomly selected. In order to measure the variables studied, questionnaires were used for climate of trust and respect scales, self-determination scale of psychological empowerment measure, performance feedback, thriving at work, job performance & organizational citizenship behavior. The proposed model was evaluated through structural equation modeling with Amos software. Interface relationships were tested in the proposed model by bootstrap method. Finding indicated that the proposed model fit the data properly. Also, the results showed that self-determination directly and through Thriving at work mediation effect on job performance and organizational citizenship behavior.