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Evaluation of environmental and occupational health students’ attitudes toward their field of study at Ardabil University of Medical Sciences, Iran, in 2013
F Amani, F Daroghe , K Akharbeen , A Ahmadi Asour ,
Volume 4, Issue 2 (4-2015)
Abstract

Background: Studies show that most students do not have sufficient scientific spirit and motivation and usually do not have the right attitude toward their chosen field of study. The aim of this study was to investigate the attitudes of students in occupational and environmental health at Ardabil University of Medical Sciences, Iran, toward their disciplines.

Materials and Methods: This cross-sectional study examined the attitudes of 150 students of environmental and occupational health in relation to their field of study. The participants consisted of students who were studying at Ardabil University of Medical Sciences between 2010 and 2013. Data collection was conducted using a questionnaire. Data were analyzed using SPSS software and P values of less than 0.05 were considered as significant.

Results: The mean and standard deviation score of attitudes of occupational and environmental health students toward their field of study and their future career were 39.6 ± 8.7 and 44.5 ± 8.5 (Total: 42), respectively. The mean score of environmental health students was close to the acceptable limit; however, the mean score of occupational health students was less than the acceptable limit. Mean score of attitude among male students was 43.2 ± 9.9, while it was 41.3 ± 8.3 among female students, indicating that the mean score of female students was below the acceptable limit and was not significant (P = 0.213). Mean score of attitude among single students was 42.6 ± 8.7, while it was 39.9 ± 9.2 among married students. The mean for married students was below the acceptable limit and this relationship was not significant (P = 0.015).

Conclusions: Although the attitudes of environmental health students toward their major were positive, occupational health students’ attitudes were negative. Thus, the Ministry of Health and Medical Education can accommodate students’ admission to these majors considering the needs of the labor market. Moreover, these majors’ curricula should be based on the real needs of society and creating new job markets should be a high priority.


Prevalence of anxiety among environmental and occupational health students in Qazvin University of Medical Sciences, Iran, in 2015
Ha Jamali, M Ghalenoei, M Yazdani Aval , E Taban, M Kolahdouzi, J Jalilian , M Rostami Aghdam Shendi,
Volume 6, Issue 3 (7-2017)
Abstract
Background: Anxiety disorders are among the most common types of psychological disorders in the world. Anxiety is an inseparable part of every person’s life and it seems that it is experienced more severely by university students. The present study aimed to investigate the prevalence of anxiety and its related factors among environmental and occupational health students.
Materials and Methods: In this descriptive cross-sectional study in 2015, the participants were selected through census-based sampling; all the Bachelor students (continuous and discontinuous) of environmental and occupational health (141 respondents) from Qazvin University of Medical Sciences, Iran, participated in this research. Data were collected using a demographic questionnaire and Spielberger State-Trait Anxiety Inventory measuring respondents’ level of anxiety. The collected data were analyzed by independent samples t-test, analysis of variance, and Pearson correlation in SPSS software.
Results: The prevalence rates of state and trait anxiety in the sample were 29.1% and 20.6%, respectively. Furthermore, 29.1% of students of environmental health and 57.9% of students of occupational health suffered from moderate to high levels of anxiety. The greatest prevalence of trait anxiety among students of environmental and occupational health was recorded for below moderate anxiety with indices of 72.8% and 84.2%, respectively. On the other hand, no significant relationship was observed between students’ year of study (ranging from the first to the fourth year) and state/trait anxiety. However, the results of Pearson correlation showed that there was a significant negative relationship between students’ grade point average and trait anxiety.
Conclusions: Anxiety among university students of environmental and occupational health range from moderate to high. Some measures should be taken to reduce this level of anxiety.

Diagnosis of the noise emission in a plastic recycling plant located in the municipality of Caçador, Santa Catarina, Brazil
Roger Francisco Ferreira de Campos,
Volume 7, Issue 3 (7-2018)
Abstract
Background: With industrial development, many production processes emit high levels of noise, presenting problems for society. This emission causes an environmental impact on employees and also on the surrounding environment.
Materials and Methods: The present study was performed with the objective of analyzing the noise emission in a plastic recycling plant in the municipality of Caçador, Santa Catarina (SC), Brazil, with the perspective of the environmental suitability with the regulatory environmental agencies.
Results: According to the relevant legislation, the plant had significant noise emission levels, reaching 98 A-weighted decibels [dB (A)], since NBR 10151/2000has permitted the emission of 70 dB (A) for industrial areas.
Conclusions: Thus, the plant under study needs to seek for ways to reduce its noise emission in its production process; this issue can be attributed to the isolation of the washing process, as the centrifuges in this process are responsible for generation of main part of the noise. Regarding the occupational hygiene process, the plant needs the distribution of ear protectors due to the emission of noise, seeking the best quality of work for its employees.
 

Enhancing High-Frequency Bandwidth in MPP-Porous Material Composite Absorbers: A Numerical Simulation Approach for Optimal Parameter Selection
Mohammad Javad Sheikhmozafari, Akbar Ahmadi Asour, Sara Hajinejad,
Volume 13, Issue 2 (6-2024)
Abstract
Background: Porous absorbers are highly effective at attenuating high-frequency noise, yet they face inherent limitations, including reduced absorption at lower frequencies and vulnerability to environmental factors. Combining porous materials with Micro Perforated Panels (MPP) offers a solution but often sacrifices bandwidth. This study deals with optimizing parameters to extend the bandwidth toward higher frequencies, considering health concerns related to high-frequency noise exposure.
Materials & Methods: This study used Finite Element Numerical Simulation (FEM) in COMSOL to model a porous material and MPP composite. It examined parameters like material thickness, air gap, hole diameter, panel thickness, MPP perforation percentage, and layer configurations. The goal was to find the best configuration to expand bandwidth, selecting and fixing the most effective parameter at each stage.
Results: Findings from the simulated model aligned with direct impedance tube measurements. Enlargement of the fibrous material thickness, up to practical limits, expanded bandwidth. Optimizing MPP parameters involved minimizing hole diameter and panel thickness while maximizing perforations. The most effective layer configuration for bandwidth expansion consisted of an air layer, porous material, another air layer, additional porous material, and the MPP layer.
Conclusions: Careful parameter selection can significantly increase bandwidth and absorption coefficients at higher frequencies. The incorporation of MPP enhances the composite's overall resilience, offering mechanical strength, resistance to environmental factors, and aesthetic appeal. The high precision of FEM simulations positions them as a valuable alternative to direct measurements such as impedance tube assessments. This study provides a comprehensive approach to improving porous absorber performance.

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