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S Jorfi, R Rezaei Kalantary, A Mohseni Bandpi, N Jaafarzadeh Haghighifard, A Esrafili, L Alaei,
Volume 4, Issue 1 (24 2011)
Abstract

Background and Objectives: Fluoride is widely used in industries such as manufacture of semiconductors, power plants, glass production etc and release to the environment via their effluents. The purpose of this sturdy was to compare the efficiency of low price adsorbents in fluoride removal from water.
Materials and Methods: The optimum values of pH, contact time and adsorbent dosage were determined and different concentrations of fluoride were experimented in lab scale conditions for bagasse, modified bagasse and chitosan. Then Langmuir and Freundlich coefficient were determined based on optimum conditions.
Results: The pH value of 7, contact time of 60 min and adsorbent dosage of 2 g/L were determined as optimum conditions for all three adsorbents. The most fluoride removal efficiency of 91% was obtained for modified bagasse in optimum conditions.
Conclusion: Based on data obtained in this study, it can be concluded that adsorption by modified bagasse is an efficient and reliable method for fluoride removal from liquid solutions.


Negin Alaei Borujeni, Reza Gholamnia, Amin Bagheri, Amir Kavousi, Reza Saeedi,
Volume 18, Issue 4 (3-2026)
Abstract

Background and Objective: Performance assessment of health, safety, and environmental (HSE) management is the process of applying and estimating components and indicators through which the extent of achieving organizational objectives, as well as progress and continuous improvement in the HSE domain, can be determined. In this study, a performance assessment index for urban HSE management using a process–outcome approach was developed and applied in Isfahan.
Materials and Methods: The index design process included the following steps: (1) extracting preliminary list of principles and indicators, (2) determining the principles and indicators through expert panel consultation, (3) assigning weights to the components of the index, (4) defining integration functions, and (5) classifying the index score. The required data for evaluating HSE management in Isfahan were collected through visits to relevant organizations, existing reports and studies, and public surveys.
Results: The performance assessment index of urban HSE management, including 16 principles and 61 indicators, was validated based on expert panel opinions, and the total weights of process-oriented and outcome-based indicators were 0.16 and 0.84, respectively. The HSE performance score for Isfahan was 66.4, indicating a medium level. The most important domains identified for improvement of HSE management in Isfahan (based on high weight and low performance score) were ambient air quality, access to health-care services, solid waste management, prevention of resource degradation and loss, public education, and top management commitment.
Conclusion: The developed index demonstrated satisfactory effectiveness in assessing the performance of urban HSE management and due to comprehensiveness and flexibility can be applied to other cities.
 


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