فهرست مطالب

  • Volume:6 Issue: 2, 2014
  • تاریخ انتشار: 1393/02/30
  • تعداد عناوین: 8
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  • Mohsen Aliabadi Page 289
    Background
    In order to identify best treatments at noisy sources, experts must be employed special noise quantities. Sound pressure close to sources is usually dependent upon the environments, therefore it is not suitable for determining noise emission of sources. This paper aims empirically to study noise emission characteristics of a typical centrifugal fan located in different layouts based on special quantities using sound intensity based method.
    Methods
    In Situ determination of noise emission of the fan included sound power, sound intensity and sound pressure was performed using VA – Lab designed by by BSWA according to standard methods in different locations.
    Results
    The results showed sound power spectrum of the fan is relatively high and contains predominant diceret tone in 250 Hz equal to 83.5 dB. The sound powers of the fan were similar in the different locations. However, notable difference exists in the sound intensities of the fan in the different layouts which are near to the values calculated by theorical equation. In order to determine the optimum locations for studied centrifugal fan, sound intensity could also accurately describe the effects of adjacent surfaces on the centrifugal fan noise than sound pressure.
    Conclusions
    This study empirically showed sound power of fan is independent of the environments and can help us for evaluating noise controls at fan elements. The results confirmed the sound power and the intensity were excellent quantities for characterizing noisy sources as centrifugal fan compared with the sound pressure. These results presented the detail of a scientific approach for analyzing noise in workrooms.
    Keywords: Noise characteristics, Sound intensity method, Centrifugal fan
  • Farid Gharibi First, Nader Esmailnasab, Mohammad Asghari Jafarabadi, Alireza Gharib Other Author Page 299
    Introduction
    Anemia is the most common blood condition among primary school students, presenting lifelong health problems to them. Iran is a country with a young population most of which study in schools. This study aimed to survey students’ anemia status and its improvement through using effective and efficient interventions in primary students in Paveh City.
    Methods
    In this interventional study, students were randomly selected, and after a primary screening, the suspected ones were recognized and referred to physicians and laboratory tests. After final approval by physicians, short and long-term interventions were carried out to address the problem of anemia. The process was repeated after one year to compare the intervention result. Then data analyzes was carried out using STATA10 software at a significance level of 0.05.
    Results
    The results of the study revealed that 37.8% of female and 24.1% of male students had problems due to anemia, which comprised 31.1% of the total number of students. The results showed that the intervention was effective for girls in their 3rd, 4th, and 5th grades leading to the reduction of the condition to 61%, 88% and 90%, respectively. This reduction in boys at 4th and 5th grade were 76% and 83% (P<0.05).
    Conclusion
    The study results showed that the rate of anemia significantly declined among the students and applying interventions were effective.
    Keywords: Anemia, students, intervention
  • Mohammad Reza Khodabakhsh, Fariba Kiani Other Author Page 307
    Introduction
    Evidence from a range of different data sources has shown that job stress is a significant problem in organizations and industries. Researchers have mentioned that attitude toward safety issues may predict psychological distresses in workplaces. The present study examined the relationship between attitude toward safety issues related to job stress and its dimensions among workers in Isfahan Steel Company. Methods and Materials: This was a cross-sectional study. Sample consisting of 189 employees in Isfahan Steel Company in 2012 was selected according to the stratified random sampling method and responded questionnaires about demography characteristics, job stress and its dimensions (perceived job self-efficacy and perceived job helplessness) and safety attitudes. The data were analyzed using Multivariate and correlation techniques.
    Results
    The results showed that 1) there were significant relationships between attitude toward safety issues with job stress and perceived job helplessness (p<0.05),2) there was no significant relationship between attitude toward safety issues and perceived job self-efficacy (p>0.05),3) multivariate analysis showed that attitude toward safety issues variable significantly predicted respectively about 18% and 10% of the variance of variables of job stress and perceived job helplessness (p<0.5).
    Conclusion
    Promoting safety attitudes can be an obstacle against the experience of job stress among employees.
    Keywords: Attitude toward safety issues, job stress, perceived job self, efficacy, perceived job helplessness
  • Afshari Afshari, Somayyeh Tajdinan, Abbas Mohammadi, Hamed Tabesh Page 319
    Introduction
    Musculoskeletal disorders are the most common work-related injuries and illnesses in workplaces. One of the important risk factors in creating low back pain during labor is undesirable postures. There are different methods for monitoring lumbar posture. The most important tools with high accuracy are direct measurement tools. The main aim of this study was to introduce and validate novel equipment in continuous monitoring of lumbar angles in the sagittal and frontal planes during work shift.
    Methods
    A standard hand-held goniometer was used to calibrate an inclinometer (Virtual Corset). Depending on the type of the measurement plate, an inclinometer was mounted on a movable arm of the goniometer and angles of the two devices were adjusted; and the rate of the accuracy of the inclinometer was determined. Flexion angles were measured to be 0º to 95º, and lateral and extension angles were measured to be 0º to 45º.
    Results
    The error obtained from the inclinometer in the sagittal and frontal planes were approximately 1º and 0.05º, respectively. In addition, Cronbach''s alpha coefficient and regression line power was obtained to be 0.99.
    Conclusion
    Despite Cronbach''s alpha being more than 0.75 and the high power of the regression line (0.99), VC is of sufficient validity for monitoring the angles of the lower back in a working shift. Additionally, the results of the study showed that the determined error was approximately identical to the error declared by the manufacturer.
    Keywords: Triaxial accelerometer, manual goniometer, sagittal plane, posture
  • Iraj Mohammadfam, Nahid Mansouri, Hanieh Nikoomaram Page 327
    Background And Objective
    The adverse outcomes of major accidents have led to the development of accident analysis techniques so as to fully investigate the incidents. However, each method has its own advantages and deficiencies, which makes it very difficult to find a single technique being capable of analyzing all types of events. So, the comparison of accident analysis methods would help find out their status in different specifications and select a more suitable method. In this research, RCA, ECFC were compared with Tripod β in order to determine the superior technique for the analysis of major accidents in manufacturing industries. Subjects and
    Methods
    In the first step of study, comparison criteria were developed using literature reviews and Delphi method. In the second step, the relative importance of each criterion was qualitatively determined and then applying Fuzzy triangular numbers, the qualitative values were converted to the quantitative values. Finally, using TOPSIS, the techniques were prioritized in terms of the criteria and the superior technique was determined.
    Results
    The results of the study showed that ECFC is superior to CBA and AABF.
    Conclusion
    Available techniques should be compared based on proper criteria in order to select the best one for the analysis, because inappropriate selection of accident analysis techniques may lead to misguided results.
    Keywords: Accident, Safety, Manufacturing, TOPSIS
  • Shahnaz Kaffashi, Ali Keshtkaran, Arefeh Pourtaleb, Mehdi Raadabadi, Parivash Heidari Page 335
    Background
    Today service quality and patient loyalty are critical impact on Health-care organizations` performance. This study aimed at making a survey on the relationship between outpatient service quality and patients’ loyalty in selected general public hospitals related to Shiraz University of Medical Sciences in 2012.
    Method
    In this descriptive, analytical and cross sectional study 256 cases of the outpatients were investigated in four public hospitals in Shiraz. The Standard questionnaires were used as data collection tool. Data were analyzed using SPSS.18 software and descriptive statistics including Spearman''s Correlation Coefficient and pair t- test.
    Result
    The findings revealed a meaningful difference between the patients’ perception and expectation in all dimensions of SERVQUAL. The patients rated ‘reliability’ to have a high gap (-2, 62) and ‘accessibility’ as the least gap (-1, 34). Among loyalty dimensions they ranked the positive word- of- mouth approach as the most important (4, 1) and price sensitivity as the least important (1, 81). The results of Pearson Correlation Test revealed overall quality and loyalty dimensions were related with each other (p<0.05).
    Conclusion
    This study showed that qualities of the provided outpatient services in hospitals were lower than patients'' expectations and there was a noticeable gap between expectations and perceptions. Given the strong correlation between Quality of services and loyalty dimensions. Also, Implementation of patient loyalty program would mediate service quality influence on patient loyalty.
    Keywords: loyalty, service quality, hospital
  • Mostfa Nasirzadeh, Aligol Mohammad, Mona Hafezi Bakhtiari, Ahmad Ali Eslami Page 343
    Background
    Brucellosis is one of the most common zoonosis diseases in the developing and undeveloped countries, with the adverse socio-economic status. This study aimed to assess the effect of health education intervention based on health belief model on promoting knowledge, beliefs, and preventive behaviors on brucellosis among women.
    Materials And Methods
    In this quasi-experimental before-after study, 282 homemakers living in the west of Isfahan were chosen based on the inclusion and exclusion criteria. They were divided randomly into the case and control groups. The data were collected through questionnaires and checklists. Then, educational contents were designed and executed. It included five sessions using lecture, question, and answer session, group discussion and role-playing based on HBM constructs. Data were analyzed using SPSS 18 by Mann-U Whitney, t-student and paired t-test and p<0.05 was considered significant.
    Results
    The results showed that before training, there was no significant difference between demographic variables and knowledge scores, performance and health belief model constructs between the two groups (P> 0.05). But immediately after and one month after the educational program based on Health Belief Model there was significant differences among the two groups (p<0.001).The scores for knowledge and other components of health belief model in experimental group significantly increased after intervention compared to the control group.
    Conclusion
    The results showed that the HBM-based educational intervention could promote knowledge, attitude, and behavior on prevention of brucellosis. Therefore, this model can be used as a framework for designing and executing educational intervention for prevention of brucellosis.
    Keywords: Education, knowledge, belief, behavior, brucellosis, educational models
  • Zohreh Nejatzadegan, Shahin Saeedinejat, Hossein Ebrahimpour, Ali Vafaee, Najar Page 351
    Background
    Self-esteem is one of the essential human needs regardless of the individual’s social, scientific, and moral status. It has an exceptional role in one’s mental health and personality balance. The purpose of the present study was to examine the relationship between self-esteem and quality of life in the students of Health School of Mashhad Medical Sciences University.
    Method
    This study was a cross-sectional survey on 234 students of Health School of Mashhad Medical Sciences University in educational year of 2012-2013.Data were collected using WHO life quality questionnaire and Copper Smith self-esteem questionnaire. The collected data were analyzed through descriptive statistics methods (frequency, percentage, mean, and standard deviation), independent t-test and ANOVA using SPSS16 software.
    Results
    The findings showed that 61% of the students had a high quality of life with a good self-esteem indicating a statistically significant relation (p=.052).Among the five domains of quality of life; a significant relation was observed between social quality and self-esteem (p<0.05(.
    Conclusion
    Students’ quality of life increases as their self-esteem increases. Since self-esteem influences students’ quality of life, performing child breeding educational sessions for promoting children self-esteem will help enhance children’s self-esteem and ultimatelyimprove students’ quality of life.
    Keywords: Quality of life, student, self, esteem