در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: International Journal of Mining and Geo-Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Numerical method,Well integrity,Geomechanical Parameters,plastic strain
- چکیده:
- چکیده انگلیسی: Well integrity is defined as the application of technical and operational solutions to reduce the uncontrollable risk of fluids leakage in the well lifetime. In any drilling and production operation, lack of knowledge about geomechanical behavior of the surrounding formations is considered as a major risk. Therefore, in-situ stress conditions and mechanical properties of formations are important factors in well integrity studies. In this paper, a 3D finite element model was built to simulate the integrity of wells. An FEM analysis was used to investigate the plastic deformation in cement and theVon Mises failure criterion inside the casings under different stress conditions, and to study the mechanical properties of the formation. A clear increase in plastic strain in the cement and Von Mises stress inside the casings was observed with increasing the ratio of horizontal to vertical stress in orthotropic and isotropic conditions as well as with increasing the difference between horizontal stresses in anisotropic conditions. When conducting the translation error sensitivity analysis, the impact of major mechanical parameters of the formation was evaluated as well. The results showed thatby increasing Young's modulus, cement became hard and brittle. Meanwhile, an increase in the Poisson ratio led to plastic behavior.The maximum plastic strain was found at the cement-casing boundary due to the presence of a lower cement-formation friction value. The highest Von Mises stress value in the casings was also produced parallel toward the minimum horizontal stress.Additionally, with an increase in the cohesion and friction angleof formation, the cement became harder, and consequently, the safety factor for the casings increased.
- انتشار مقاله: 09-01-1398
- نویسندگان: Eissa Khodami,Ahmad Ramezanzadeh,Mehdi Noroozi,Mohammad Mehrad
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Mining and Geo-Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Discrete Fracture Network,Hydraulic analyses,Jointed rock mass
- چکیده:
- چکیده انگلیسی: Fluid flow in jointed rock mass with impermeable matrix is often controlled by joint properties, including aperture, orientation, spacing, persistence and etc. On the other hand, since the rock mass is made of heterogeneous and anisotropic natural materials, geometric properties of joints may have dispersed values. One of the most powerful methods for simulation of stochastic nature of geometric characteristics of joins is three dimensional stochastic discrete fracture network (DFN) modelling. The current research is conducted to develop an applicable discrete fracture network model for hydraulic analyses. Also, DFN-FRAC3D software – which was proposed earlier for mechanical analysis - is developed to construct a hydraulic DFN. For this purpose, joint aperture parameter is added to other geometric features of model including orientation, spacing, persistence and intensity. In order to develop an accurate hydraulic DFN model, correlation between the joint aperture and length is also considered, that has not been observed in most previous studies. In this study, the software is developed for detection of connected joint networks. In order to test the performance of the provided simulator, a 3D hydraulic model for fracture network of rock mass in Mazino region is presented.
- انتشار مقاله: 07-08-1396
- نویسندگان: ALI - HEYDARI,Seyed Esmaeil Jalali,Mehdi Noroozi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,Prevalence,Students,Adolescent,mental health,SDQ
- چکیده:
- چکیده انگلیسی: Background
Mental health problems are common among adolescents. Proper screening and rehabilitation could improve adolescents’ function at the present time and in the future. This study aimed to assess the prevalence of psychiatric disorders and the associated familial factors among high school students.
Materials and Methods
The present cross-sectional study was conducted on 630 high school students (315 boys and 315 girls) aged 13-17 years in Jahrom, Iran. The participants were selected using random cluster sampling. The data were collected using the self-report version of strength and difficulties questionnaire (SDQ), and were analyzed using the SPSS statistical software, version 16.0.
Results: The results showed that 22.38% of the students had total difficulty (14.9% of boys, and 29.8% of girls). The highest prevalence was related to peer relationship problems (23%) followed by conduct problems (18.1%), hyperactivity (11.1%), pro-social behaviors (6.3%), and emotional problems (5.7%). The results of multivariate logistic regression analysis revealed that female gender (odds ratio [OR]: 2.52, 95% confidence interval [CI]: 1.68-3.66) increased the odds; while grade 9 (OR=0.52, 95% CI: 0.32-0.83), and number of siblings (OR: 0.88, 95% CI: 0.78-0.99) decreased the odds of mental health problems (p<0.05).
Conclusion
According to the results, the prevalence of behavioral disorders was relatively high among the students. The number of sibling, being girl and being in nine grade significantly contributed to the prevalence of behavioral disorders. In order to reduce these disorders, familial intervention and educational programs are recommended to be designed and implemented to prevent and treat behavioral disorders among students.- انتشار مقاله: 20-10-1396
- نویسندگان: Jafar Hassanzadeh,Fatemeh Rezaei,Zaher Khazaei,Mehdi Noroozi,Leila Jahangiry
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: children,Diarrhea,Length of hospitalization,Gastro-Fix Gastroenteritis
- چکیده:
- چکیده انگلیسی: Background: According to evidence, the main treatment plans for children with gastroenteritis include the use of an oral solution or intravenous infusion for hydration, continued nutrition; zinc supplementation. The aim of this study was to investigate the effectiveness of Gastro-Fix (registered nutritional supplement) versus placebo on length of hospitalization and duration of diarrhea in children with acute gastroenteritis.
Materials and Methods: We conducted a double blind randomized placebo-controlled trial in children with acute gastroenteritis (age between 6 and 120 months). Three hundred eligible patients randomly allocated to one of two parallel groups, Intervention received Gastro-Fix, whereas the placebo group received baby food (cereal based on skimmed milk and wheat without mineral) for a total of 6 days. Gastro-Fix and baby food was administered as a same sachet that could be opened and mixed in water. The primary outcome was length of hospitalization and duration of diarrhea.
Results: The Mean length of hospitalization in Gastro-Fix and placebo was 3.43+ 0.57 and 4.70+0.59 day respectively (P<0.001). Median duration of diarrhea was 3 days (range: 3-5, IQR: 3–4 days) in the Gastro-Fix group and 5 days (range 3-6, interquartile range [IQR]: 4–5 days) in the placebo group which was statistically significant (P<0.001). The highest efficacy (diarrhea-free percentage of children) of the Gastro-Fix was observed at day 4 (relative risk [RR]: 0.28; 95% confidence interval [CI]: 0.23-0.35), and at day 5 (RR 0.08; 95% CI: 0.03-0.17) after the intervention.
Conclusion: Finding of this study showed that Gastro-Fix can be effective in reducing duration of diarrhea and length of hospitalization in children with diarrhea. This product is suggested to be used in children with acute gastroenteritis.- انتشار مقاله: 27-10-1396
- نویسندگان: Kumars Porrostami,Reza Arjmand,Hamid Asayesh,Mehdi Noroozi,Omid Safari,Mostafa Qorbani
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,Adolescent,Helicobacter pylori,Metabolic Syndrome
- چکیده:
- چکیده انگلیسی: Background: At least half the world’s population is colonized the stomach by Helicobacter pylori (H. pylori) which are a key constituent of the human microbiome. The aim of this study was to investigate the association of cardiometabolic risk factors with H. pylori infection in Iranian adolescents. Materials and Methods: The current study was conducted along with the third survey of a national school-based surveillance system in Iran, entitled "Childhood and Adolescence Surveillance and Prevention of Adult Non-communicable Disease" (CASPIAN) study. Detailed questionnaires on demographic, socioeconomic, dietary, and health-related information of the participants were filled by one of the parents under supervision of trained health-care workers. Trained healthcare professionals measured anthropometric indices, blood pressures according to standard protocols. Fasting venous blood was examined for fasting blood sugar and lipid profile.
Results: Overall 882 serum samples were suitable for testing. H. pylori antibody was found in 643 serum samples (72.9%). Among cardiometabolic risk factors, only the mean weight of participants was different between two groups (44.6±11.8 in H. pylori positive and 42.8±11.3 in H. pylori negative group; p=0.04). Overall, 5.1% of adolescents with positive H. pylori tests were overweight or obese, while 1.7% of negative ones were so (p=0.02). In the multivariate regression model, H. pyloriseropositivity increased the risk of overweight (OR, 3.3; 95%CI, 1.2-9.3; p= 0.03). In the multivariate model, association of other cardiometabolic risk factors with H. pylori infection was not statistically significant (p>0.05).
Conclusion: Results of present study showed that H. pylori infection was associated with excess weight in adolescents. H. pylori eradication may be decrease the risk of obesity.- انتشار مقاله: 29-03-1396
- نویسندگان: Enayat Kalantar,Mohammand Javad Gharavi,Shervin Ghaffari Hoseini,Ramin Heshmat,Mojgan Oshaghi,Behnaz Gharegozlou,Hamid Asayesh,Armita Mahdavi Gorabi,Mohammad Esmaeil Motlagh,Mehdi Noroozi,Mostafa Qorbani,Roya Kelishadi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: Cigarette smoking,Students,adolescence,Hookah use
- چکیده:
- چکیده انگلیسی: Background: Tobacco and hookah smoking is a worldwide problem among adolescents. The present study aimed to determine familial and social factors in predicting the tobacco and hookah smoking among high school students in Jahrom, South of Iran.
Materials and Methods: This cross-sectional study was conducted for assessing the factors affecting hookah and cigarette smoking among high school students during January to April 2015. The participants were 630 high school students (girls=315 and boys=315). The self-administered questionnaire containingstudents’ demographics, parent education, family sizes, tobacco using, tobacco using of the family, hookah smoking, and hookah smoking in the family was used. Multiple logistic regression (MLR) models using the Enter method were fitted to assess the factors that increased or decreased the risk of smoking.
Results: The risk of cigarette smoking was increased with: cigarette smoking by sister (s) or brother (s) (36.8 [95% confidence interval(CI) (1.28-105)]; P=0.03), hookah smoking by mother (6.64 [95%CI (1.28-34.2)]; P=0.02), hookah smoking by father (OR: 5.33 [95%CI:1.88-15.07; P=0.02 ]), hookah smoking by mother (OR: 29.53 [95%CI:10.26-85.01, P<0.001]), hookah smoking by sister (s) or brother (s) (OR: 31.6 [95%CI: 10.71-93.3, P<0.001]), and not consult with parents (4.38 [95%CI (1.48-12.9)]; P=0.007), were significantly related to hookah smoking (P<0.05).
Conclusion
In current study, the prevalence rate of hookah smoking is notable among bothmale (3.8%) and female (1.6%) sexes. Despite the protective role of family in the substance use studies, in the case of hookah smoking, the family provides an opportunity for adolescence to experience hookah smoking.- انتشار مقاله: 02-12-1395
- نویسندگان: Fatemeh Rezaei,Mehdi Noroozi,Morteza Mansourian,Omid Safari,Leila Jahangiry
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: Students,perception,fast foods,Intention
- چکیده:
- چکیده انگلیسی: Background: Studies report inappropriate snack and junk food consumption patterns in children and young adults in Iran. The current survey was aimed to explore fast food consumption behaviors in high-school students based on the Theory of Planned Behavior.
Materials and Methods: A cross-sectional study was done among 500 high-school students. Samples were selected based on cluster sampling method at first and simple random at second. Data were collected using a researcher-made questionnaire. To analyze, SPSS-16 and tests, including t-test, Chi-square, correlation coefficient and multiple regressions were used.
Results: The monthly frequency of fast food consumption was 4.01. The TPB explained fast food use behaviors with R2 of 0.6, effectively. Results also represented that frequency of fast food consumption was meaningfully in line with behavioral intention (β = 0.60, P < 0.05) and subjective norms (β = 0.17, P < 0.05).
Conclusion: It seems likely beneficial to consider important subjective norms (especially friends) that may strongly effect on high-school student intention to use fast food. Also students perceived behavioral control must be increased.- انتشار مقاله: 18-03-1395
- نویسندگان: Kamal Mirkarimi,Morteza Mansourian,Mohammad Javad Kabir,Rahman Berdi Ozouni- Davaji,Maryam Eri,Seyed Ghadir Hosseini,Mostafa Qorbani,Omid Safari,Babak Rastgari Mehr,Mehdi Noroozi,Abdurrahman Charkazi,Hossein Shahnazi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Travel Medicine and Global Health
- نوع مقاله: Journal Article
- کلمات کلیدی: Maternal Mortality,Root cause analysis,Indirect cause of death,Clinical Epidemiology
- چکیده:
- چکیده انگلیسی: Introduction: Level of mothers’ literacy, pregnancy history of more than four times, residence in villages, lack of receiving intensive care during pregnancy, as well as inaccessibility to obstetric emergency services have been reported, in Iran and the world, as major factors for maternal mortality. Considering significance of identifying indirect causes of maternal mortalities, the present study was aimed to determine the contribution of indirect causes to maternal mortalities in Markazi province, Iran.
Methods: This retrospective, descriptive-analytical study analyzes root causes and sentinel events through describing a case of maternal mortality reported in Markazi province. The data were gathered through interviews and documents’ investigation, and Bayesian analysis and calculation of conditional probability in Netica 5.08 software were used.
Results: Findings on a 36-year-old mother, in the 37th week of her third pregnancy and suffering from cardiomyopathy, indicated that lack of receiving prenatal care on time, insensitivity of health and medical personnel to pursuing the patient’s timely referrings according to Ministry of Health and Medical Education guidelines, lack of coordination and monitoring on the part of team of specialists responsible for the pregnant mother’s treatment in hospital, and indifference toward appropriate management of treatment were determined as indirect causes of the mother’s death.
Conclusion: While cardiomyopathy was registered as direct cause of death, according to root cause analysis indirect causes had a 43% contribution to the mother’s death. Thus, planning for determination of major causes and eliminating indirect causes are very important for reducing maternal mortalities.- انتشار مقاله: 03-07-1392
- نویسندگان: Mahmoud Mobasheri,Ali Ahmadi,Babak Eshrati,Mehdi Noroozi,Leila Lashkari
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Health Policy and Management
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,HIV,Kerman,Stigma,healthcare providers
- چکیده:
- چکیده انگلیسی: Background
Stigmatizing attitudes among healthcare providers are an important barrier to accessing services among people living with HIV (PLHIV). This cross-sectional study aimed to assess the status and correlates of HIV-related stigma among healthcare providers in Kerman, Iran.
Methods
Using a validated and pilot-tested stigma scale questionnaire, we measured HIV-related stigma among 400 healthcare providers recruited from three teaching hospitals (n = 363), private sectors (n = 28), and the only voluntary counseling and testing (VCT) center (n = 9) in Kerman city. Data were gathered using self-administered questionnaires at participants’ workplace during Fall 2016. To examine the correlates of stigmatizing attitudes, we constructed bivariable and multivariable linear regression models.
Results
The mean ± standard deviation (SD) of stigma score was 25.95 ± 7.20 out of the possible 50, with higher scores reflecting more stigmatizing attitudes. Paramedics, nurses’ aides, and housekeeping staff had the highest, and VCT personnel had the lowest average stigma scores, respectively. Multivariable regression analyses showed that prior experience of working with PLHIV (β = -2.48; P = .03), exposure to HIV-related educational courses (β = -2.03; P = .02), and P < .001) were associated with lower stigma scores.
Conclusion
Our findings highlight the need for health managers to provide training opportunities for healthcare providers, including programs that focus on improving HIV-related knowledge for healthcare providers. Enforcing policies that aim to reduce HIV-related stigma and discrimination among healthcare providers in Iran are urgently needed.- انتشار مقاله: 02-07-1397
- نویسندگان: Fatemeh Tavakoli,Mohammad Karamouzian,Ali Ahmad Rafiei-Rad,Abedin Iranpour,Mehrdad Farrokhnia,Mehdi Noroozi,Ali Sharifi,Brandon D.L. Marshall,Mostafa Shokoohi,Hamid Sharifi
- مشاهده