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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Mining and Environment
- نوع مقاله: Journal Article
- کلمات کلیدی: Experimental Design,Cd2+,nano magnetic,carboxymethyl chitosan
- چکیده:
- چکیده انگلیسی: The main objective of the present study is to investigate the feasibility of using Carboxymethyl chitosan magnetic nanoparticles (CCMN) for the adsorption of Cd2+. The study also reports important parameters, which affect the adsorption process, i.e., pH, adsorbent dose, contact time and concentration of Cd2+, using Box-Behnken designs. Firstly, functional carboxymethyl chitosan magnetic nanoparticles (about 33 nm) was prepared by chemical coprecipitating and characterized by means of scanning electron microscope (SEM), X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FTIR). Then, CCMN was used as the adsorbent for the treatment of effluent. The ANOVA result of the full model shows that pH, adsorbent dosage and metal concentration had a significant effect on metal removal. In addition, this parameters indicates which contact time variable does not have a significant effect (p>0.05).
- انتشار مقاله: 11-11-1390
- نویسندگان: A Igder,Ali Akbar Rahmani,Ali Fazlavi,Mohammad Hossein Ahmadi,Mohammad Hossein Ahmadi Azqhandi,Mohammad Hassan Omidi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Kerman University of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Ultrasonography,fracture,diagnostic imaging,Nasal Bone
- چکیده:
- چکیده انگلیسی: Introduction: Nasal bone fractures are one of the most common problems in patients who are referred to otolaryngology centers. We aimed to evaluate physical examination, sonography and conventional lateral nasal bone radiography in patients with nasal bone trauma and its relation to intra-operative findings. Methods: This prospective study was performed on 200 patients with nasal trauma and those suspicious for nasal bone fracture. The results of physical examination, sonography and radiography were recorded in a check list and compared with intra-operative findings. Data were analyzed using SPSS software version 21.0 and the means of groups were compared using parametric or non-parametric tests according to the result of 1-sample K-S test for normal distribution. P-values less than 0.05 were considered statistically significant. Results: Evaluation of 200 patients and their sonography revealed that the sensitivity and specificity of this method was higher than the conventional lateral nasal bone radiography. Sonography compared to physical examination in the diagnosis of dorsum and lateral nasal bone fractures had higher sensitivity and specificity. For septal fractures, the specificity of physical examination was higher and the sensitivity of both methods was the same. Conclusion: Sonography with higher sensitivity and specificity is a useful method in the diagnosis of nasal bone fractures. In comparison to radiography it has no radiation; therefore, it is more useful for children and pregnant women.
- انتشار مقاله: 28-01-1398
- نویسندگان: Mohammad Saeid Ahmadi,Hamid Gol Mohammadi,Mohammad Ali Seif Rabiei,Malihe Akbarpour
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Islamic Political Studies
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی:
- انتشار مقاله: 19-12-1398
- نویسندگان: Mohammad Hadi Ahmadi,Mohammad Hadi Ahmadi,Mohammad Hadi Ahmadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Information Technology Management
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی: The aim of this study is to analyze the factors affecting the acceptance of electronic health on the basis of the theory of planned behavior. E-health is a growing field of health communication that entails using medical informatics, public health, and trades. As a result, E-health facilitates the provision of health information and services through the internet and related technologies. In this regard, this study aims to explain the acceptance of e-health by its beneficiaries such as physicians, patients, and healthcare managers. The results have shown that the most important factors affecting the acceptance of e-health are: 1. Organizational related factors of e-health services; 2. Human-related factors of acceptors; 3. Environment-related factors; 4. Factors associated with financial sources and expenditures; 5. Technical and infrastructural factors. Taking advantage of interpretive structural modeling, we demonstrated these factors and determined the level of their reciprocal relations.
- انتشار مقاله: 22-05-1398
- نویسندگان: Ruhollah Tavallaei,Mohammad Milad Ahmadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Energy Management and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: risk assessment,Hydraulic Fracturing (HF),Iranian oil and gas reservoirs
- چکیده:
- چکیده انگلیسی: Hydraulic Fracturing (HF) is the most applicable technique for increasing productivity in reservoirs with medium to high permeability. Iranian oil and gas reservoirs with such permeability can benefit from this technology. Nowadays, this is not a very common technique in Iran. Because of various risks and related factors in Iran, the HF operation elements (e.g., designing, execution, evaluation, management and etc.) have not had considerable success and expansion. Correspondingly, an appropriate risk assessment and management can help the National Iranian Oil Company (NIOC) for developing this technology in their reservoirs. The aim of this work is to assess the HF risks and to determine an effective handling plan for this operation in Iran. The proposed methodology includes literature review, face-to-face interview with the respected experts, and evaluation of the gathered data. We hope the advised handling options are properly applied as a guideline for a successful HF in Iran.
- انتشار مقاله: 06-09-1398
- نویسندگان: Mohammad Ali Hatefi,Seyed Reza Shadizadeh,Majid Zendedel Siuki,Mohammad Ali Ahmadi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: finite difference method,Wave Propagation,functionally graded materials,torsional wave
- چکیده:
- چکیده انگلیسی: In this study, torsional wave propagation is investigated in a rod that are made of one and two dimensional functionally graded material. Firstly, the governing equations of the wave propagation in the functionally graded cylinder derived in polar coordinate. Secondly, finite difference method is used to discretize the equations. The Von Neumann stability approach is used to obtain the time step size. Two states are assumed for material distribution, in first state it’s considered that the material variation occurred only in radial direction(Ti6A14V and Al2O3) and in second state the material properties vary in radial and length directions(BN, Al 1100, Ti6A14V and Al2O3). Moreover, the effect of cutoff frequency and boundary condition in wave propagation is studied. The results was validated by comparing the analytical and numerical solutions for an isotropic rode subjected to a torsional impulsive load. The results show that the torsional wave propagation in FGM rod evidently effects by material composition variation.
- انتشار مقاله: 03-10-1397
- نویسندگان: Alireza Amiri,Hossein Rahmani,Mohammad Ahmadi Balootaki
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Water,Arsenic species,ICP-AES,Total arsenic,Babagorgor fountain,SDDC
- چکیده:
- چکیده انگلیسی: Since Babagorgorfountain in the Ghorveh city of Kurdistan province is located in the arsenic belt of Iran, to raise awareness about the quality of drinking water from this fountain the concentration of arsenic and other heavy metals as well as other physicochemical parameters were investigated to protect the public health. In this study, water samples were collected from Babagorgorfountain. Arsenic in the water was measured by field and laboratory methods. Its concentration was estimated to be more than 500 ppb in a field method and 596 ppb in a SDDC method with absorbance measurements at 520 nm. The SDDC method can measure arsenic species separately and the concentration of arsenite and arsenate were found to be 239 and 357 ppb, respectively. Other physiochemicalparameters and heavy metals in the fountain water were evaluated according to standard methods. According to the World Health Organization guidelines the maximum safe level of arsenic in drinking water is 10 ppb. The concentration of arsenic in this fountain’s water is estimated at 60 times the limit and therefore its use is very dangerous for public health.
- انتشار مقاله: 13-06-1396
- نویسندگان: Mohammad Ahmadi Jebelli,Afshin Maleki,Mohammad Ali Amoozegar,Enayatollah Kalantar,Behzad Shahmoradi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Water,Arsenic species,ICP-AES,Total arsenic,Babagorgor fountain,SDDC
- چکیده:
- چکیده انگلیسی: Since Babagorgorfountain in the Ghorveh city of Kurdistan province is located in the arsenic belt of Iran, to raise awareness about the quality of drinking water from this fountain the concentration of arsenic and other heavy metals as well as other physicochemical parameters were investigated to protect the public health. In this study, water samples were collected from Babagorgorfountain. Arsenic in the water was measured by field and laboratory methods. Its concentration was estimated to be more than 500 ppb in a field method and 596 ppb in a SDDC method with absorbance measurements at 520 nm. The SDDC method can measure arsenic species separately and the concentration of arsenite and arsenate were found to be 239 and 357 ppb, respectively. Other physiochemicalparameters and heavy metals in the fountain water were evaluated according to standard methods. According to the World Health Organization guidelines the maximum safe level of arsenic in drinking water is 10 ppb. The concentration of arsenic in this fountain’s water is estimated at 60 times the limit and therefore its use is very dangerous for public health.
- انتشار مقاله: 13-06-1396
- نویسندگان: Mohammad Ahmadi Jebelli,Afshin Maleki,Mohammad Ali Amoozegar,Enayatollah Kalantar,Behzad Shahmoradi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Computer Engineering and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: E-government,Multi-Criteria Decision Making Methods,E-Readiness Assessment Models,Layered Architecture
- چکیده:
- چکیده انگلیسی: E-readiness is one of the major prerequisites for effective implementation of e-government. For the correct implementation of e-government, it is needed to accurately assess the state of e-readiness in desired community. In this regard, there are models to assess, but the correct choice of model is one of the most important challenges in this area. The process of evaluating and selecting the appropriate options in the implementation of e-government due to the involvement of different groups of decision-makers, existence of interrelationships between technology and desired community as well as existing platforms is a complex process. In recent decades, with access to computational methods and powerful decision making systems selecting more accurate options, effective analysis of qualitative and quantitative characteristic and studying the interaction between them are provided. This article tries to examine the performance of e-readiness assessment models and multi criteria decision making methods and introduces the best selection of the e-readiness model for effective implementation of e-government. In order to reach this purpose, we introduced a layered architecture based on multi-criteria decision making methods and SWOT Analysis. The proposed layered architecture, reduces decision making errors and increases the accuracy in choosing the appropriate e-readiness assessment model.
- انتشار مقاله: 01-09-1395
- نویسندگان: Mina Sadat Mousavi Kasravi,Mohammad Ahmadinia,Abbas Rezaiee
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of AI and Data Mining
- نوع مقاله: Journal Article
- کلمات کلیدی: Routing attacks,MANETs,Dynamic Anomaly Detection,Incremental Principal Component Analyses
- چکیده:
- چکیده انگلیسی: Mobile Ad-hoc Networks (MANETs) by contrast of other networks have more vulnerability because of having nature properties such as dynamic topology and no infrastructure. Therefore, a considerable challenge for these networks, is a method expansion that to be able to specify anomalies with high accuracy at network dynamic topology alternation. In this paper, two methods proposed for dynamic anomaly detection in MANETs those named IPAD and IAPAD. The anomaly detection procedure consists three main phases: Training, Detection and Updating in these methods. In the IPAD method, to create the normal profile, we use the normal feature vectors and principal components analysis, in the training phase. In detection phase, during each time window, anomaly feature vectors based on their projection distance from the first global principal component specified. In updating phase, at end of each time window, normal profile updated by using normal feature vectors in some previous time windows and increasing principal components analysis. IAPAD is similar to IPAD method with a difference that each node use approximate first global principal component to specify anomaly feature vectors. In addition, normal profile will updated by using approximate singular descriptions in some previous time windows. The simulation results by using NS2 simulator for some routing attacks show that average detection rate and average false alarm rate in IPAD method is 95.14% and 3.02% respectively, and in IAPAD method is 94.20% and 2.84% respectively.
- انتشار مقاله: 20-10-1391
- نویسندگان: Meysam Alikhani,Mohammad Ahmadi Livani
- مشاهده