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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: modeling,Carbon Monoxide,Cement Plant,Gaussian Model
- چکیده:
- چکیده انگلیسی: The objective of our study was to simulation of carbon monoxide (CO) dispersion exited from the stacks of a cement industry of Doroud, Iran by Gaussian Model (GM). Four sampling period was conducted to measurement of CO from the factory's three-stack flow during one year. The input parameters for were the rate of CO emission, meteorological data, factors of related to the stack, and factors of related to the receptor. Parameters were corporate and the dispersion of CO during four season was modeled. The southwesterly winds were dominated during recently five years. The highest and the lowest CO levels were estimated at spring and fall seasons with maximum amounts of 842.06 and 88.31 µg/m3 within distances of 526 and 960 m away from the cement plant, respectively. Although, the maximum predicted CO concentration at four seasons were lower than the NAAQS standard, the simulation results can be used as a base for reduction of CO emissions rate, because the long-term exposure to emissions of cement plant imposes potentially significant health and environmental impacts.
- انتشار مقاله: 04-06-1395
- نویسندگان: Gholamreza Goudarzi,Rajab Rashidi,Mohammad Javad Mohammadi,Shahram Sadeghi,Mehdi Amidnia,Yusef Omidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Azo,clay,Bromocresol green,Hexadecyltrimethylammonium Bromide
- چکیده:
- چکیده انگلیسی: In this batch study, montmorillonite was modified by a cationic surfactant [hexadecyltrimethylammonium bromide (HDTMA-MMT)] and used as sorbent to remove bromocresol green (BCG) from aqueous solutions. The effect of several factors such as surfactant loading rate onto the clay, contact time, pH, adsorbent dosage, dye concentration, and ion strength were investigated on the sorption. The equilibrium time for BCG sorption was reached at contact time of 20 minutes. Fitting the experimental data to different kinetic and isotherm models showed that the experimental data are well described by pseudo-second-order kinetic (R2 > 0.99) and Freundlich isotherm (R2 > 0.99) models. According to the results of this study, HDTMA-MMT can be considered as a low-cost, eco-friendly, and highly effective option for the sorption of BCG from aqueous solutions.
- انتشار مقاله: 12-03-1395
- نویسندگان: Yusef Omidi-Khaniabadi,Ali Jafari,Mehdi Jourvand,Sedigheh Saeedi,Hassan Basiri,Heshmatollah Nourmoradi,Gholamreza Goudarzi,Ali Mirza-Heidari,Seyed Mohammad Daryanoosh,Bahram Kamarehei,Shahram Sadeghi,Mohammad Javad Mohammadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Ahvaz,Water Distribution Network,Failures Analysis
- چکیده:
- چکیده انگلیسی: Failures in the water distribution network are some most important factors in water losses, water shortage and dissatisfaction of users and secondary pollutions as well. This research aimed to analyze failure in water distribution networks during 2006-2008, for better water management. Daily failure reports in Ahvaz, Iran distribution network during 2006-2008, were collected from emergency department of Ahvaz water and Wastewater Company; thereafter, they were entered into an Excel database, also failures were defined by pipes type, pipe diameter, and cause of the failure, and finally the data were analyzed. Results indicated that asbestos and polyethylene pipes show maximum failures; maximum failure and fracture has occurred in pipes with 100 and 150 mm diameters. The most important factors affecting on failure were corrosion, traffic load and landslide. In addition, simultaneous influence of type and the diameter of the pipe on the failures were statistically significant. The depth of pipes establishment, corrosion and obsolescence of pipes as well as improper type of pipes were the most important causes of failures in Ahvaz Water Distribution Network. In this regard, upgrading pipe material setting standards and renewing water pipe network are the main strategies for failures minimization.
- انتشار مقاله: 10-06-1392
- نویسندگان: Mehdi Ahmadi,Mohammad-Javad Mohammadi,Kambiz Ahmadi-Angaly,Ali-Akbar Babaei
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: modeling,Carbon Monoxide,Cement Plant,Gaussian Model
- چکیده:
- چکیده انگلیسی: The objective of our study was to simulation of carbon monoxide (CO) dispersion exited from the stacks of a cement industry of Doroud, Iran by Gaussian Model (GM). Four sampling period was conducted to measurement of CO from the factory's three-stack flow during one year. The input parameters for were the rate of CO emission, meteorological data, factors of related to the stack, and factors of related to the receptor. Parameters were corporate and the dispersion of CO during four season was modeled. The southwesterly winds were dominated during recently five years. The highest and the lowest CO levels were estimated at spring and fall seasons with maximum amounts of 842.06 and 88.31 µg/m3 within distances of 526 and 960 m away from the cement plant, respectively. Although, the maximum predicted CO concentration at four seasons were lower than the NAAQS standard, the simulation results can be used as a base for reduction of CO emissions rate, because the long-term exposure to emissions of cement plant imposes potentially significant health and environmental impacts.
- انتشار مقاله: 04-06-1395
- نویسندگان: Gholamreza Goudarzi,Rajab Rashidi,Mohammad Javad Mohammadi,Shahram Sadeghi,Mehdi Amidnia,Yusef Omidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Azo,clay,Bromocresol green,Hexadecyltrimethylammonium Bromide
- چکیده:
- چکیده انگلیسی: In this batch study, montmorillonite was modified by a cationic surfactant [hexadecyltrimethylammonium bromide (HDTMA-MMT)] and used as sorbent to remove bromocresol green (BCG) from aqueous solutions. The effect of several factors such as surfactant loading rate onto the clay, contact time, pH, adsorbent dosage, dye concentration, and ion strength were investigated on the sorption. The equilibrium time for BCG sorption was reached at contact time of 20 minutes. Fitting the experimental data to different kinetic and isotherm models showed that the experimental data are well described by pseudo-second-order kinetic (R2 > 0.99) and Freundlich isotherm (R2 > 0.99) models. According to the results of this study, HDTMA-MMT can be considered as a low-cost, eco-friendly, and highly effective option for the sorption of BCG from aqueous solutions.
- انتشار مقاله: 12-03-1395
- نویسندگان: Yusef Omidi-Khaniabadi,Ali Jafari,Mehdi Jourvand,Sedigheh Saeedi,Hassan Basiri,Heshmatollah Nourmoradi,Gholamreza Goudarzi,Ali Mirza-Heidari,Seyed Mohammad Daryanoosh,Bahram Kamarehei,Shahram Sadeghi,Mohammad Javad Mohammadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Foreign Language Teaching and Translation Studies
- نوع مقاله: Journal Article
- کلمات کلیدی: comparability study,Computer-based Language Test (CBLT),Paper-based Language Test (PBLT)
- چکیده:
- چکیده انگلیسی: Computer technology has provided language testers with opportunity to develop computerized versions of traditional paper-based language tests. New generation of TOEFL and Cambridge IELTS, BULATS, KET, PET are good examples of computer-based language tests. Since this new method of testing introduces new factors into the realm of language assessment (e.g., modes of test delivery, familiarity with computer, etc.), the question may be whether the two modes of computer- and paper-based tests comparably measure the same construct, and hence, the scores obtained from the two modes can be used interchangeably. Accordingly, the present study aimed to investigate the comparability of the paper- and computer-based versions of a writing test. The data for this study were collected from administering the writing section of a Cambridge Preliminary English Test (PET) to eighty Iranian intermediate EFL learners through the two modes of computer- and paper-based testing. Besides, a computer familiarity questionnaire was used to divide participants into two groups of high and low computer familiarity. The results of the independent samples t-test revealed that there was no statistically significant difference between the learners' computer- and paper-based writing scores. The results of the paired samples t-test showed no statistically significant difference between high- and low-computer-familiar groups on computer-based writing. The researchers concluded that the two modes comparably measured the same construct.
- انتشار مقاله: 02-09-1397
- نویسندگان: Mohammad Mohammadi,Masoud Barzgaran
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Foreign Language Teaching and Translation Studies
- نوع مقاله: Journal Article
- کلمات کلیدی: ESP,Distance learning,Self-Directed Learning,self-directed language learning,self-directed training
- چکیده:
- چکیده انگلیسی: The major role of self-directed learning (SDL) in a successful learning at distance education has been confirmed by various studies. Although learners pass General English courses before studying any ESP courses at distance education of Iran, they usually lack the preliminary skills for independent language learning. The current study aimed to explore the effect of self-directed training (SDT) on ESP learners’ self-directed learning readiness (SDLR). Eighty-six B.A students (19 male and 67 female) studying English for Economy and Management at Tabriz Payam-e-Noor University participated in this study. A demographic questionnaire and Guglielmino’s (1978) self-directed learning readiness scale (SDLRS) were implemented to select the participants of the control and experimental groups. The experimental group was provided with SDT in three different stages a) an introduction to SDL, b) SDT workshop, and c) SDT pamphlet. Then, a post-test of SDLRS was given to the two groups. ANCOVA was applied to analyze the data. The results revealed that SDT could enhance ESP learners’ SDLR. The findings imply that an appropriate training is needed to improve learners’ SDLR. Higher levels of SDLR can contribute to a successful ESP learning at Payam-e-Noor University in Iran.
- انتشار مقاله: 01-09-1397
- نویسندگان: Mohammad Mohammadi,Parinaz Mohammadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Applied Research in Water and Wastewater
- نوع مقاله: Journal Article
- کلمات کلیدی: Assessment,Existing conditions,Performance benchmarking,Tabriz Metropolitan,Water utility
- چکیده:
- چکیده انگلیسی: Supply and maintenance of urban drinking water utilities are the most important priorities of people in the world especially in urban areas and it is very clear for urban planners or decision makers to evaluate the costs of action or weigh them against the problems of inaction. Also, specific annual budget is essential for ensuring people welfare and using water utilities with good quality. There are different issues in relation to managing of urban water utilities in terms of cultural, social, physical, environmental and even political and it is necessary to assess the existing conditions of utility by authorities and experts for making decision about those applications. So, we introduce Performance Benchmarking method for reaching this aim. This method is one of the best and update solutions in analyzing drinking water utility in developed countries especially in United State of America. So, in this paper, seven drinking water utilities of United State have been compared with Tabriz metropolitan drinking water utility that is located in North West of Iran and results of indicators’ performance have been comparatively explained. Also, Results show that Tabriz metropolitan drinking water utilities are low advanced in terms of many indicators’ performance than seven United States drinking water utilities. But, in some indexes almost equal to and in certain other cases are advanced than it. However, this methodology is very effective for decision makers, responsible and other experts in all regions and this model can be applied for other cities and urban areas.
- انتشار مقاله: 31-04-1396
- نویسندگان: Hamid Najaf Zadeh,Karim Hosseinzadeh Dalir,Mohammad Reza Pourmohammadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Applied Biotechnology Reports
- نوع مقاله: Journal Article
- کلمات کلیدی: Morphine,Royal jelly,Prefrontal cortex
- چکیده:
- چکیده انگلیسی: Introduction: Royal jelly (RJ) is a honey bee secretion with numerous medicinal properties and antioxidant activities. Morphine is a major risk factor in the development of functional disorders in several organ systems. This study was designed to evaluate the effects of RJ against morphine-induced damage to the prefrontal cortex of rats.
Materials and Methods: In this study, 48 male Wistar rats were randomly assigned into 6 groups: sham group, morphine group, RJ groups (100, and 200 mg/kg), and morphine + RJ groups. Treatments were administered intraperitoneally and orally for 20 days on a daily basis. Ferric reducing/antioxidant power (FRAP) method was applied to determine the total antioxidant capacity. The number of neurons and, dendritic spines were investigated by Golgi technique, and Griess technique was employed to determine the serum nitrite oxide level.
Results: Morphine administration significantly increased the nitrite oxide level and total antioxidant capacity, and reduced neuronal dendritic spines and neurons compared to the sham group (P < 0.05). In all RJ and Morphine + RJ groups, the number of neurons and neuronal dendritic spines were elevated significantly, while nitrite oxide level and total antioxidant capacity were reduced compared to the morphine group (P < 0.05).
Conclusions: RJ administration protected animals against oxidative stress and nitrite oxide. It also improves some prefrontal cortex parameters including number of neurons and dendritic spines because of the morphine.- انتشار مقاله: 24-11-1397
- نویسندگان: Cyrus Jalili,Shiva Roshankhah,Mohammad Mehdi Mohammadi,Mohammad Reza Salahshoor
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Pharmaceutical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Chromatography,Bivalent ions,Chemical Inhibitors,Humane placenta,LOX activity,LOX isolation
- چکیده:
- چکیده انگلیسی: Lipoxygenase(LOX) catalyzes irreversible transfer of oxygen molecule to Arachidonic and Linoleic acid to produce 13 Hydroproxy Octadecadienoic acid. Recent studies showed the involvement of Lipoxygenase products, leukotrienes, in inflammations and Lipoxygenase pathways acts as mediators of early inflammatory events in atherosclerosis. The aim of the present study was purification and characterization of Lipoxigenase from Human placental. The human placental Lipoxigenase was extracted and purified by normal butanol, acetone, ammonium sulphate (30-80%), and gel permeation chromatography on Sephadex G-150. After purification and characterization of LOX, the in vitro inhibitory effect of KCN, NaN3 and some selected bivalent ions such as Co2+, Ni2+, Cu2+, and Zn2+ was checked on the activity of purified LOX. Results showed that specific activity was 123.16 u/mg proteins and the yield of purification was 21.84 percent. Also, it was found that Co2+, Ni2+, KCN, and NaN3 at concentration of 20 mM had inhibitory effect on LOX activity and their inhibitory was 72.4, 58.2, 56.5 and 42.3% respectively, however Cu2+ stimulated the lipoxygenase activity at the same concentration whereas Zn2+ has no significant effect on LOX activity. With respect to increase of LOX activity in the patient with cardiovascular diseases, Alzheimer's disease, cancer, chronic obstructive pulmonary disease (COPD), artherogenesis, and also airway inflammation diseases, suggesting that LOX inhibition may have beneficial effects as a potential target to limit the severity of related symptoms of these diseases and therefore these inhibitors could be considered as an agent for decreasing the enzyme activity in association with the disease.
- انتشار مقاله: 12-03-1392
- نویسندگان: Alireza Kheirollah,Mohammad Aberomand,Abdolrahim Nikzemir,Ali Mohammad Malekasgar,Mohammad Alimohammadi
- مشاهده