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Showing 2 results for Yazdani Rad
The design and manufacturing of phase change material cooling vests and their effectiveness in reducing thermal strain under laboratory conditions
Saeed Yazdani Rad, Habibollah Dehghan,
Volume 3, Issue 3 (Journal of Ergonomics 2015)
Abstract

Introduction: Water and paraffin are well-known phase change materials used in the manufacturing of cooling vests. The present study was conducted to design and make a cooling vest using commercial paraffin compounds and ice and to then examine their effect on thermal strain parameters in hot climate conditions in a climate chamber.

Materials and Methods: A cooling vest was first made with polyester fabric and containing 17 aluminum packs. Each aluminum pack was filled with 72 g of water and 65 g of prepared paraffin. A total of 10 male students then performed a treadmill exercise in hot climate conditions in a climate chamber (ambient temperature (TA) = 40 0C and relative humidity (RH) = 40%) once with and once without wearing the cooling vest and at two levels of exercise intensity, including a light intensity (2.8 kph) and a moderate intensity (4.8 kph) exercise. Each stage of the experiment involved 30 minutes of rest and 30 minutes of exercise on the treadmill. Participants’ heart rate, oral and skin temperature and sweat rate were measured throughout the study.

Result: The latent heat of the prepared paraffin was 108 kJ/kg and the peak melting point was 30 °C. Significant differences were observed between participants’ mean heart rate, oral and skin temperature and sweat rate at both exercise intensities and both with and without the cooling vest (P<0.05).

Conclusion: The use of a cooling vest containing paraffin and ice can reduce thermal strain through reducing the heart rate, oral and skin temperature and sweat rate.


Role of Individual Factors on the Individual Resilience and Productivity of Employees in one of the Oil and Gas Companies in South of Iran in Epidemics Conditions of COVID-19
Saeed Yazdani Rad, Mahsa Jahadi Naeini, Marziyeh Sadeghian, Seyed Mahdi Mousavi, Milad Abbasi,
Volume 8, Issue 4 (Iranian Journal of Ergonomics 2021)
Abstract
 
Background and Objectives: Coronavirus disease 2019 (COVID-19) causes mental effects as well as physical effects, which can affect the occupational dimensions of people. The present study was aimed to determine the effect of individual factors on resilience and productivity loss of employees at epidemics conditions of Coronavirus in an occupational environment.
Methods: This cross-sectional study was performed, in Spring of 2020, on 275 personnel in one of the southern industrial companies of Iran. Data collection instruments included demographic questionnaire, researcher made questionnaire, CD-RSC resilience questionnaire, and Hershey and Gold Smith productivity questionnaire. The collected data were analyzed using SPSS software version 22.
Results: The results of one-way analysis of variance (ANOVA) showed that people older than 50 years and more than 20 years of work experience and low and medium experience in using personal protective equipment had a significantly lower resilience score (P<0.05). Also, the results of the analysis revealed that the individuals with experience of COVID-19 had significantly lower score of productivity (P<0.05). Moreover, the results showed that there was a significant positive correlation between resilience and productivity (r=0.249, P<0.05).
Conclusion: COVID-19 disease has reduced the resilience and productivity of workers. Therefore, adherence to health protocols in the workplace is necessary to reduce the risk of developing COVID-19.

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