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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of the Iranian Chemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Desorption,Sawdust,Polyaniline,Removal,Polypyrrole,Thiocyanate ion
- چکیده:
- چکیده انگلیسی: Polypyrrole (PPy/Cl) and polyaniline (PAni/Cl) synthesized chemically onto sawdust (SD)
was used for removal of thiocyanate (SCN-) ions from aqueous solutions. The effect of some
important parameters such as pH, initial concentration, sorbent dosage, and contact time on
uptake of SCN- was investigated. PPy/SD was found to be much more effective sorbent than
PAni/SD for uptake SCN- from aqueous solutions. Removal of SCN- ions using PPy/Cl is
supposed to be occurred mostly via ion exchange process at the surface of polymer coated onto
sawdust as a very thin film. Desorption studies were also carried out for figuring out the
possibility of the regeneration and reuse of the exhausted adsorbent. A proposed mechanism
based on interesting anion exchange properties of the PPy/Cl has been discussed. It was found
that polypyrrole conducting polymers doped with releasable counterions can be used for used to
remove some anions via ion exchange process under simple open circuit conditions. The finding
in this paper shows the promising application of polypyrrole conducting polymers in future water
or wastewater purification technology.- انتشار مقاله: 20-10-1387
- نویسندگان: Reza Ansari,Nilofar Khoshbakht Fahim,,Ali Fallah Dellavar
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Simulation and Analysis of Novel Technologies in Mechanical Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Multi-Walled Carbon Nanotubes,Dynamic instability,Mathieu-Hill model,Floquet–Lyapunov theory
- چکیده:
- چکیده انگلیسی: The dynamic instability of single-walled carbon nanotubes (SWCNT), double-walled carbon nanotubes (DWCNT) and triple-walled carbon nanotubes (TWCNT) embedded in an elastic medium under combined static and periodic axial loads are investigated using Floquet–Lyapunov theory. An elastic multiple-beam model is utilized where the nested slender nanotubes are coupled with each other through the van der Waals (vdW) interlayer interaction. Moreover, a radius-dependent vdW interaction coefficient accounting for the contribution of the vdW interactions between adjacent and non-adjacent layers is considered. The Galerkin’s approximate method on the basis of trigonometric mode shape functions is used to reduce the coupled governing partial differential equations to a system of extended Mathieu-Hill equations. Applying Floquet–Lyapunov theory, the effects of elastic medium, length, number of layers and exciting frequencies on the instability conditions of CNTs are investigated. Results show that elastic medium, length of CNTs, number of layer and exciting frequency have significant effect on instability conditions of multi-walled CNTs.
- انتشار مقاله: 04-04-1396
- نویسندگان: Habib Ramezannejad,Hemad Keshavarzpour,Reza Ansari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Patient Safety & Quality Improvement
- نوع مقاله: Journal Article
- کلمات کلیدی: mortality,Blunt trauma,Chest trauma,Abdominal trauma,Taleghani trauma center
- چکیده:
- چکیده انگلیسی: Introduction: To evaluate the characteristics of thoracic and abdominal trauma in patients referred to Taleghani trauma center of Mashhad, Iran during a period of 6 months.
Materials and Methods: In a retrospective cross-sectional study the recoded data of inpatient cases who admitted because of thoracic or abdominal trauma in March to September 2017 were evaluated. The demographic data, classification, complications and mechanism of injury of the patients were extracted into checklists and analyzed.
Results: 411 cases were studied, the majority being male (81.9%, n = 337). The patients' average age was 33.25 ± 19.23 years, varying from 1 to 92 years of age. Male, younger ages, blunt mechanisms and motor vehicle accidents were the main findings. The mortality rate was 10.8%.
Conclusions: Effective education especially for boys and youngsters is needed. Also due to the role of motor vehicle accidents, providing safe frame-works of transportation consists of roads and vehicles is a priority.- انتشار مقاله: 03-10-1396
- نویسندگان: Mohammad-Reza Mamaghani-Ghazijahani,Ali Jangjoo,Mohammad-Reza Ansari-Astaneh
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Health Sciences and Surveillance System
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,Students,female,Iron-Deficiency
- چکیده:
- چکیده انگلیسی: Background: Girls are one of the high risk groups for iron deficiency anemia. Iron supplementation program is a preventive strategy for female students in high schools in Iran. This study aimed to estimate the prevalence of iron supplements consumption among high school students in the southeast of Iran. Methods: A quantitative study was conducted in Zahedan (the capital of Sistan and Balochestan province) in the southeast of Iran in 2015. The sample size was 400 high school students from different areas of Zahedan who were randomly selected. A standard questionnaire was used for data collection. The data were analyzed using SPSS statistical software through descriptive statistics, one way ANOVA and Chi-square. Results: In total, 68.2% of the students did not administer any tablets whether regularly or irregularly during the past 16 weeks. About 41 third grade students did not take any tablets in 16 weeks. There were a statistically significant correlation between lack of taking tablet and their grade point average of the last year (P=0.003, F=1.078); also, it had a significant association with school grade of students (P=0.009). Conclusion: Most of the students did not use iron supplementation in Zahedan high schools. Measures should be taken to increase the culture of consuming iron tablets by providing appropriate environmental conditions; it seems that iron supplementation programs will have positive impacts on the students.
- انتشار مقاله: 29-10-1394
- نویسندگان: Mohammad Khammarnia,Zahra Amani,Mahsa Hajmohammadi,Alireza Ansari-Moghadam,Marzieh Eslahi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Dental Materials and Techniques
- نوع مقاله: Journal Article
- کلمات کلیدی: systemic inflammation,Chronic periodontitis,healthy subjects,LATEX – high sensitivity,C – reactive protein
- چکیده:
- چکیده انگلیسی: Background: Chronic periodontitis causes systemic inflammation and increases C-reactive protein (CRP). CRP has been implicated as a possible mediator of associating periodontitis and several systemic diseases. The aim of the present study was to investigate systemic levels of CRP in patients with chronic periodontitis in comparison to periodontally healthy individuals. Materials and methods: A total of 80 individuals were included in this study. 40 patients with severe chronic periodontitis aged 40, and 40 sex matched periodontally healthy subjects were recruited from the patients attending Dpartment of Periodontics, Faculty of Dentistry, Zahedan. Body Mass Index (BMI) was under 25 kg/m2 in all the patients and controls. Peripheral blood samples were taken and CRP levels were estimated in serum samples using the C - reactive protein – hs (CRP-hs) LATEX – High sensitivity (Biosystem S.A). Result: CRP levels in women in the test group (3.64 +- 2.77 mg/l) was significantly higher than the women in the control group (p < 0.001); however, the difference between males in the two study groups was not significant (p=0.13). Conclusion: Periodontitis results in higher systemic levels of CRP. Elevated inflammatory factor may increase inflammatory activity in atherosclerotic lesions and potentially increase the risk for cardiovascular events.
- انتشار مقاله: 13-06-1396
- نویسندگان: Somaye Ansari Moghadam,Siavash ZadFattah,Sirous Risbaf Fakour,Alireza Ansari Moghaddam,Mohammad Naebi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: finite element method,Thermal Conductivity Coefficient,Single-walled carbon nanotube,Polypropylene matrix
- چکیده:
- چکیده انگلیسی: In this paper, finite element method is used to obtain thermal conductivity coefficients of single-walled carbon nanotube reinforced polypropylene. For this purpose, the two-dimensional representative volume elements are modeled. The effect of different parameters such as nanotube dispersion pattern, nanotube volume percentage in polymer matrix, interphase thickness between nanotube and surrounded matrix and nanotube aspect ratio on the thermal conductivity coefficient of nanotube/polypropylene nanocomposite are investigated. For the dispersion pattern, three different algorithms, including random dispersion, regular dispersion along the temperature difference and regular dispersion perpendicular to the temperature difference are employed. Furthermore, the temperature is considered in the range of 0°C to 200°C. The nanotube volume percentage in the polymer matrix is selected as 1%, 3% and 5%. It is shown that the polypropylene matrix reinforced by the regular distribution of nanotubes directed parallel to the temperature difference leads to the largest thermal conductivity coefficients. Besides, the nanocomposites with larger volume percentages of carbon nanotubes possess larger thermal conductivity coefficients.
- انتشار مقاله: 19-07-1396
- نویسندگان: Reza Ansari,Saeed Rouhi,Masoud Ahmadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Risk Management,Assessment,Drinking Water,Water Distribution Network,Water Safety Plan
- چکیده:
- چکیده انگلیسی: Access to clean and safe drinking water has been the focus of officialsin charge of supplying water through many different methods. Water safety program is a new method for ensuring the safety of water by applying systematic prevention and risk analysis approach. The present study has been performed on a water supply system. Water Safety Plan contains 12 different steps which analyze topics such as system description, identifying dangers, risk analysis, etc. The checklist obtained by using the above steps will be applied as input information to a water safety program software named WSP-QATOOL. The risks identified and listed by experts in drinking water were scored using the world health organization data. Also, the results of data analysis are given in tables and graphs. The 12 different steps of analysis earned 212 points out of the total possible points of 440. Basins, water treatment, distribution network, and water outlet points earned 48.86 percent of these points and the reviewing step had 0.0 percent of the total points for coordination with water safety program. The questions related to the system description and identifying dangers and risk analysisstep with 100 percent point had the highest percentage in coordination with the program. System Analysis earned a score of 48.18 percent in general. In order to increase this score, the water safety program should be fully performed and a program should be developed to control the recognized risks with a specified amount to support it.
- انتشار مقاله: 29-02-1397
- نویسندگان: Shahla Shafiei,Mohammad Fahiminia,Mohammad Khazaei,Ahmad Soltanzadeh,Abolfazl Mohammadbeigi,Vahid Razmju,Reza Ansari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Risk Management,Assessment,Drinking Water,Water Distribution Network,Water Safety Plan
- چکیده:
- چکیده انگلیسی: Access to clean and safe drinking water has been the focus of officialsin charge of supplying water through many different methods. Water safety program is a new method for ensuring the safety of water by applying systematic prevention and risk analysis approach. The present study has been performed on a water supply system. Water Safety Plan contains 12 different steps which analyze topics such as system description, identifying dangers, risk analysis, etc. The checklist obtained by using the above steps will be applied as input information to a water safety program software named WSP-QATOOL. The risks identified and listed by experts in drinking water were scored using the world health organization data. Also, the results of data analysis are given in tables and graphs. The 12 different steps of analysis earned 212 points out of the total possible points of 440. Basins, water treatment, distribution network, and water outlet points earned 48.86 percent of these points and the reviewing step had 0.0 percent of the total points for coordination with water safety program. The questions related to the system description and identifying dangers and risk analysisstep with 100 percent point had the highest percentage in coordination with the program. System Analysis earned a score of 48.18 percent in general. In order to increase this score, the water safety program should be fully performed and a program should be developed to control the recognized risks with a specified amount to support it.
- انتشار مقاله: 29-02-1397
- نویسندگان: Shahla Shafiei,Mohammad Fahiminia,Mohammad Khazaei,Ahmad Soltanzadeh,Abolfazl Mohammadbeigi,Vahid Razmju,Reza Ansari
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: finite element method,Thermal Conductivity Coefficient,Single-walled carbon nanotube,Polypropylene matrix
- چکیده:
- چکیده انگلیسی: In this paper, finite element method is used to obtain thermal conductivity coefficients of single-walled carbon nanotube reinforced polypropylene. For this purpose, the two-dimensional representative volume elements are modeled. The effect of different parameters such as nanotube dispersion pattern, nanotube volume percentage in polymer matrix, interphase thickness between nanotube and surrounded matrix and nanotube aspect ratio on the thermal conductivity coefficient of nanotube/polypropylene nanocomposite are investigated. For the dispersion pattern, three different algorithms, including random dispersion, regular dispersion along the temperature difference and regular dispersion perpendicular to the temperature difference are employed. Furthermore, the temperature is considered in the range of 0°C to 200°C. The nanotube volume percentage in the polymer matrix is selected as 1%, 3% and 5%. It is shown that the polypropylene matrix reinforced by the regular distribution of nanotubes directed parallel to the temperature difference leads to the largest thermal conductivity coefficients. Besides, the nanocomposites with larger volume percentages of carbon nanotubes possess larger thermal conductivity coefficients.
- انتشار مقاله: 19-07-1396
- نویسندگان: Reza Ansari,Saeed Rouhi,Masoud Ahmadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Neonatology
- نوع مقاله: Journal Article
- کلمات کلیدی: Phototherapy,Jaundice,Keywords: Hypercalciuria
- چکیده:
- چکیده انگلیسی: Background: One of the recognized symptoms of phototherapy in neonates is hypocalcemia and hypercalciuria, and its etiology has not been identified yet. The present study investigated the recurrence of hypercalciuria among neonates with jaundice treated with phototherapy.
Methods: This cross-sectional diagnostic examination was conducted on 100 newborns with jaundice treated with phototherapy in Ali-ibn-Abi-Talib hospital in Zahedan, Iran, during 2013 and 2014. In the present study, the subjects were collected in an accessible way after agreement and considering exclusion criteria. Calcium and creatinine (Ca/Cr) proportion in urinary tests of the neonates was estimated at the baseline and 24 h after the onset of phototherapy. The information was analyzed utilizing paired t-test.
Results: The mean of gestational age was 38.5±2.5 weeks. Out of 100 cases, 53 newborns (53%) were male and 47 (47%) were female. The mean scores of birth weight was 2.52±0.59 kg and neonatal serum bilirubin level was 16.5±0.92 mg/dl. Ca/Cr ratios in neonates with jaundice were 0.28±0.21 and 0.40±0.34 before and after the phototherapy, respectively. Regarding that, the increase in Ca/Cr ratio was statistically significant (P<0.001). Hypercalciuria was not observed in the neonates before the phototherapy; however, it was noticed in 13 neonates after the phototherapy. Ca/Cr ratios in neonates with hypercalciuria and other newborns were 1.16±0.19 and 0.29±0.18, respectively. Furthermore, the difference between the two groups was statistically significant (P<0.001).
Conclusion: Based on the results of this study, it was suggested that the neonates undergoing the phototherapy were at risk of hypercalciuria and the increased amount of urinary calcium excretion by means of phototherapy.- انتشار مقاله: 10-09-1397
- نویسندگان: Mahmoud Imani,Simin Sadeghi-bojd,Fathmeh Khonamani Falahati,Alireza Ansari Moghadam
- مشاهده