Relationship among Noise Exposure, Noise Annoyance, Emotional Intelligence, and Cognitive Emotional Regulation: A Generalized Structural Equation Modeling

Background and Aim: There is evidence of associations between noise exposure and psychological outcomes from noise annoyance. This study aims to examine the mediating role of noise annoyance in the relationship of noise exposure with Emotional Intelligence (EI) and Cognitive Emotion Regulation (CER). Methods: This is a cross-sectional study that was conducted on 58 male workers of a lead mine in Yazd, Iran. Noise exposure was determined based on ISO 9612:2009. Noise annoyance was assessed using the ISO/TS 15666:2003’s numerical rating scale. The Schutte Self-Report Emotional Intelligence Test (modified version) and the Cognitive Emotion Regulation Questionnaire (CERQ) were used for data collection. Mann-Whitney U test, correlation test, and Generalized Structural Equation Modeling (GSEM) were used to analyze the data. Results: The mean age of workers was 35.78±7.10 years. A significant relationship was found between noise annoyance and noise exposure, such that a unit increase in noise exposure had a multiplicative effect on the odds of experiencing more annoyance (p<0.001). Also, for every one-unit increase in noise annoyance, mean scores for EI and CER decreased by 0.192 and 0.172, respectively. Conclusion: Noise exposure is directly related to noise annoyance and indirectly related to EI and CER. Further studies in this area are recommended to clarify the issue and the relationships between these variables

Investigation of Noise Pollution Distribution in Different Parts of Yazd Textile Factories

Background: Chronic occupational exposure to noise is an unavoidable reality in the country's textile industry and even other countries. The aim of this study was to compare the sound pressure level in different parts of the textile industry in Yazd and in different parts of the textile industry. Methods: This cross-sectional study was performed on 930 textile workers in Yazd. A questionnaire was used to obtain demographic information and how to use protective equipment. Then, to obtain the sound pressure level of each unit and device and to use the measurement principles, a calibrated sound level meter was used. Then the results were analyzed using SPSS Ver.29 software. Results: The participants in this study were 714 males and 216 females with a mean age of 35.27 and 33.63 years, respectively. Seven hundred fifty-six participants (81.29%) were exposed to sound pressure levels higher than 85 dB. Among the participants, only 18.39% of the people used a protective phone permanently. Except for factory E, with an average sound pressure level of 77.78 dB, the rest of the factories had an average sound pressure level higher than the occupational exposure limit. The sound measurement results of different devices show that the sound pressure levels above 90 dB are related to the parts of Dolatab, Ring, Kinetting (knitting), Chanel, Autoconer, Dolakni, Open End, MultiLakni, Tabandegi, Texture, and Poy. Conclusion: Based on the results of the present study, noise above 90 dB is considered as one of the main risk factors in most parts of the textile industry (spinning and weaving), which in the absence of engineering, managerial or individual controls on it causes hearing loss in becoming employees of this industry

ارزيابي ريسک و تحليل پيامد حريق و انفجار در يک مخزن وينيل کلرايد با استفاده از نرم افزار PHAST

Background and Objectives: Fire and explosion are the most important and common consequences of released chemicals. In present study the consequences of jet fire and explosion in a Vinyl Chloride Monomer (VCM) tank was investigated. Materials and Methods: In this applied study, fire and explosion from 16 material releasing scenarios were investigated using PHAST.7.11 software. The tank’s temperature, pressure, volumes and shape were 70OC, 9bar, 3600m3 and spherical respectively. The meteorological data were categorized based on Pasquil method. The mortality rate and danger radius for each scenario were calculated and analyzed. Results: The smallest (11m) and the largest (79m) radius effected by the explosion pressure wave belongs to 50mm slot release and the complete rupture respectively. The highest pressure wave (1bar) is produced from a complete rupture extending from 0-80m from the gas cloud center that cause the 10.27 and 2.57% mortality rate of day and night working shifts respectively. The largest and the smallest areas covered by the jet fire are 1861 and 185m2 respectively and the largest and the smallest radius covered by radiation heat from this fire are 59.4 and 20.4m respectively. Conclusion: Any possible leakage from the tanks will have catastrophic consequences, indicating a very high and unacceptable level of risk. As a result, considering the levels of damage caused by the explosion wave, the necessary measures for the prevention of these consequences are imperative. &nbsp; How to cite this article: Bahmani R, Pouyakyan M, Khodakarim S, Bidel H, Salehi-Sahlabadi A, Jafari MJ. Risk Assessment and Consequence Analysis of Fire and Explosion in a Vinyl Chloride Monomer Tank by PHAST. J Saf Promot Inj Prev. 2021; 8(4):208-18. &nbsp;سابقه و هدف: آتش‌سوزي و انفجار از مهم‌ترين و رايج‌ترين پيامدهاي ناگوار رهايش مواد شيميايي به شمار مي‌روند. هدف اين مطالعه ارزيابي ريسک و تحليل پيامد حريق و انفجار در يک مخزن وينيل کلرايد با استفاده از نرم‌افزار PHAST بود. روش بررسي: در اين مطالعه کاربردي، حريق و انفجار ناشي از 16 سناريوي رهايش مواد با استفاده از برنامه نرم‌افزاري PHAST 7.11 بررسي شد. دما، فشار، حجم و شکل مخزن به ترتيب 70 درجه سانتي‌گراد، 9 بار، 3600 مترمکعب و کروي بود. طبقه‌بندي شرايط جوي بر پايه جدول پاسکوييل انجام شد. درصد مرگ‌ومير و شعاع خطر در هر يک از سناريوها محاسبه و تحليل شد. يافته‌ها: کمترين (11متر) و بيشترين (79متر) شعاع تحت تأثير موج فشار ناشي از انفجار به ترتيب مربوط به نشتي 50 ميلي‌متري و پارگي کامل بود. بيشترين موج فشار ايجادشده (يک‌بار) در پارگي کامل مخزن در فاصله بين 0 تا 80 متري از مرکز ابر بخار بود که باعث درصد مرگ‌ومير افراد روز کار &nbsp;و شب‌کار به ترتيب 27/10 و 57/2 درصد خواهد بود. بيشترين و کمترين مساحت تحت پوشش آتش فوراني که باعث مرگ‌ومير مي‌شود به ترتيب مساوي 1861 و 185 مترمربع بود. بيشترين و کمترين پوشش گرماي تابشي ناشي از اين حريق به ترتيب مساوي 4/59 و 4/20 متر از مخزن بود. نتيجه‌گيري: هرگونه نشتي احتمالي از مخزن موردمطالعه، پيامدهاي فاجعه باري دربر خواهد داشت که نشان‌دهنده وجود سطح ريسك بسيار بالا و غيرقابل‌قبول است. درنتيجه با در نظر گرفتن سطوح آسيب ناشي از موج انفجار و نتايج به‌دست‌آمده پيشنهاد مي‌شود که&nbsp; برنامه‌ريزي لازم جهت پيشگيري از اين پيامدها در اين صنايع انجام شود. How to cite this article: Bahmani R, Pouyakyan M, Khodakarim S, Bidel H, Salehi-Sahlabadi A, Jafari MJ. Risk Assessment and Consequence Analysis of Fire and Explosion in a Vinyl Chloride Monomer Tank by PHAST. J Saf Promot Inj Prev. 2021; 8(4):208-18

Study of Risk Factors Effects Recurrence of Lumbar Disc Herniation (LDH) after Open Spine Surgery

Background: Low back pain is one of the most common diseases worldwide. Factors such as occupational,personal, and environmental causes affect low back pain development and spread. Lumbar Disc Herniation(LDH) is one of the main causes of low back pain. This study aimed to investigate the risk factors for LDH.Materials and Methods: This descriptive cross-sectional study examined the recurrence of LDH among 301patients after lumbar surgery over three years. Demographic and medical information of individuals wereobtained using individuals' medical records. People were interviewed for the job and other information. Basedon LDH recurrence, individuals were divided into two groups with/without recurrence. SPSS Ver.17 softwareand appropriate statistical tests were used to analyze the data.Results: The incidence of LDH recurrence was 28 (9.3%) in the samples. In this study, the number of malesamples was 154 (51.2%) with a recurrence of 9.7% and 147 female samples (48.8%) with recurrence of 8.8%,and the mean age of the samples was 48.62 (13.35), with a range of Changes 15-79 years. Based on the resultsof statistical tests, there was no statistically significant relationship between risk factors and recurrence ofLDH.Conclusion: Factors such as gender, age, smoking, physical characteristics, and occupational conditions causeor accelerate the recurrence of LDH in patients. The low volume of the group with LDH recurrence in this studycaused no significant relationship between recurrence and risk factors