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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Modern Processes in Manufacturing and Production
- نوع مقاله: Journal Article
- کلمات کلیدی: Temperature Field,Laser-TIG Hybrid Welding,FEM-Simulation- Nd:YAG Laser,Heat Source Model
- چکیده:
- چکیده انگلیسی: In this paper, a three-dimensional finite element model has been developed to simulate the laser-TIG hybrid welding (HLAW) of stainless steel 1.4418 with thickness of 4 mm. Transient temperature profile and dimensions of the fusion zone and heat affected zone (HAZ) during welding process are calculatedusing finite element method (FEM) and were solved in the ABAQUS/Standard software.The heat source model is a combination of Goldak distribution for the arc heat flux, a body Gaussian distribution for laser heat flux and a surface heat flux model. The DFLUX subroutine was used for implementation of the movable welding heat sources of the models.To validate the model, several HLAWexperiments were performed with a pulsed Nd:YAG laser and TIGsources. Good agreement between the simulated and the experimental measurements revealed that the model would be appropriate forHLAWnumericalsimulation. Among the material properties, the material conductivity is the most important term which influences on the weld bed dimensions.
- انتشار مقاله: 04-03-1395
- نویسندگان: Mahmoud Moradi,Majid Ghoreishi,Azam Rahmani
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: Behavior,Students,fear,Oral health,Trans-theoretical Model
- چکیده:
- چکیده انگلیسی: Background: Fear of dental care prevents dental cleaning behavior and increases the prevalence of dental caries. This study was conducted to determine the effect of Trans-Theoretical Model constructs and fear of dental care on the dental cleaning behavior of students.
Materials and Methods: This cross-sectional study was carried out in Sanandaj city, Iran, in 2017. Using multi-stage sampling, 1,344 male and female students were included in the study. They completed a self-report questionnaire, including demographic information, Trans-Theoretical Model constructs and fear of dental care. Data were analyzed using SPSS software (version 22.0).
Results: A total of 1,344 male and female students with a mean age of 15.22±2.64 years participated in the study; from the perspective of students, dental caries (88.4%) was the most frequent illness and tongue inflammation (0.6%) was the least frequent disease.Overall, 32.9% of the students used no tools for cleaning their teeth. Fear of dental care and perceived barriers were reduced significantly during the stages of dental cleaning behavior (p<0.05) and perceived self-efficacy and perceived benefits were significantly increased (p<0.001). The odds of dental cleaning behavior increased with self-efficacy (OR=1.34, 95%CI=1.22-1.48, p<0.05), and decreased with fear of dental care (OR=0.90, 95%CI=0.80-0.98, p<0.01).
Conclusion: The findings showed dental cleaning behavior among students was at a low level and various factors such as perceived self-efficacy, benefits and barriers and fear of dental care influenced its performance.- انتشار مقاله: 21-02-1398
- نویسندگان: Leila Allahqoli,Vinnaras Nithyanantham,Azam Rahmani,Arezoo Fallahi,Marzieh Fathi,Nammam Ali Azadi,Tahereh Pashaei,Thomas Volken
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: Students,Social Support,Oral health,Trans-theoretical Model,School role
- چکیده:
- چکیده انگلیسی: Background
Social support and school play a pivotal role in the development of oral health-related behaviors among students. This study was conducted to determine the relationship between stages of dental cleaning behavior change based on Trans-theoretical model with school role and social support in Iranian students.
Materials and Methods
In a cross-sectional study, 525 male and female students were selected through cluster and simple random sampling. Demographic information, data related to trans-theoretical model constructs and social support and school role were collected via self-reports. The obtained data were analyzed using SPSS version 16.0 software.
Results
The findings showed that 58% of students (32% boys and 26% girls) used none of the dental cleaning tools. Most of the students (42.5%) were found to be in the preparation stage of dental cleaning behavior. There was a significantly direct correlation between school role and self-efficiency and perceived benefits (P<0.05, r=0.159). Also there was a significantly reverse correlation between school role and perceived barriers (P<0.05, r= -0. 311,). No significant correlation was reported between social support and school role during stages of dental cleaning behavior (P>0.05).
Conclusion
The results indicated that the majority of students did not use of dental cleaning tools and did not receive sufficient social support in this regard. To perform dental cleaning behavior, student should increase perceived self-efficacy and benefits and decrease perceived barriers. Low performance of dental cleaning behavior among students is indicative of the necessity of performing intervention programs aiming to promote dental cleaning behavior.- انتشار مقاله: 10-12-1395
- نویسندگان: Babak Nemat Shahrbabaki,Masoumeh Hashemian,Arezoo Fallahi,Azam Rahmani,Asrin Saedpanah
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Pacific Journal of Cancer Prevention
- نوع مقاله: Journal Article
- کلمات کلیدی: diagnostic accuracy,Pap smear,VIA,VILI,Cervical lesions
- چکیده:
- چکیده انگلیسی: Background: Despite the World Health Organization (WHO) recommendations concerning the use of alternative tests for the detection of cervical cancer precursor lesions in low-income countries, the accuracy of these tests is a debated issue. In the present study we compare the diagnostic accuracy of the triple test with that of colposcopy for the diagnosis of premalignant and malignant cervical lesions. Methods: A cross-sectional study was performed in 328 women referred to the gynecology clinic at Shahid Sadoughi Hospital, affiliated to Yazd University of Medical Sciences (SSUMS), Yazd, Iran, from March 2016 to June 2018. As the first step, a Pap smear was obtained from all participants. Visual inspection with acetic acid (VIA) and Lugol’s iodine (VILI) was performed in accordance with the known protocol. A colposcopy was then conducted in all participants, biopsy samples were obtained, and histological features studied. Finally, the results were compared by statistical analysis. Results: The age range of the participants was 30 - 50 years. Of 328 women, 60 (18.3 %) were postmenopausal. Two-hundred and five patients (62.5 %) had an abnormal Pap smear, 165 (50.3 %) had abnormal results on colposcopy, and 141 (43 %) had abnormal histopathology reports. The VIA was positive in 129 patients (39.3 %) and the VILI in 177 (54 %). The results of the triple test were reported to be positive in 205 cases (51.52 %). The sensitivity of the triple test in the detection of premalignant and malignant cervical lesions was 78.7 % and 69 %, respectively. The sensitivity and specificity of colposcopy in the detection of premalignant and malignant cervical lesions was 80.1 % and 72.2 %, respectively. The diagnostic accuracy of the triple test and colposcopy in the detection of premalignant and malignant cervical lesions was 73 % versus 75 %. Conclusion: Since the results of the study showed that the diagnostic accuracy of the triple test is equivalent that of colposcopy, the former may be used in low-income countries and areas lacking access to colposcopy.
- انتشار مقاله: 30-02-1399
- نویسندگان: Neda Fatahi Meybodi,Mojgan Karimi-Zarchi,Leila Allahqoli,Leila Sekhavat,George Gitas,Azam Rahmani,Arezoo Fallahi,Babak Hassanlouei,Ibrahim Alkatout
- مشاهده