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Search Results: 1 - 10 of 401657 matches for " M. Torabi Azad "
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Physics of Light in the North Coasts of Persian Gulf (Bushehr province) during Winter Season
M. Torabi Azad,H. Hosseini,M. R. Afzali,Moz.Emtyazjoo
Latin-American Journal of Physics Education , 2011,
Abstract: We present a study to field measurement and laboratory experiments of light for university students in physical oceanography. During 6thto 8thof February 2009 in two stations of Bushehr province central coasts, sampling of sea water and other effective physical parameters were carried out. The effects of laser light in 532, 659, and 980nm on the collected water samples in two different stations were studied. Then light attenuation coefficient and the amount of light penetration percentage for these stations at different depths were calculated. According to the results of this study, light attenuation coefficient in the first station, the wave length for red and infrared lights is more than the wave length for green light. For red and infrared wave lengths the amount of light absorption in the first station is more than the second one. The salinity, temperature, and cloud cover parameters are not effective in the amount of light absorption. The effective factor in increasing the amount of light absorption in this station than the second station is water turbidity
Physical Properties of Persian Gulf Outflow Thermohaline Intrusion in the Oman Sea  [PDF]
Eram Ghazi, Abbasali Aliakbari Bidokhti, Mojtaba Ezam, Masoud Torabi Azad, Smaeyl Hassanzadeh
Open Journal of Marine Science (OJMS) , 2017, DOI: 10.4236/ojms.2017.71013
Abstract: Various CTD data obtained in the Oman Sea are analyzed to explain structural features of intrusive layering. Special attention is compensated to thermohaline intrusions observed in layers (depth ranges of 150 m to 450 m, 150 m to 350 m, 100 m to 350 m and 150 m and 400 m in the winter, spring, summer and autumn, respectively). The temperature and salinity profiles in thermohaline intrusion have sawtooth structure in all stations, while they have step structure in density field. Based on interpretations, detailed estimates of thickness are about 10 to 20 meters. The T-S diagrams show the positions of the outflow intrusion with different thicknesses and depths for all seasons in the Oman Sea. Vertical profiles of temperature and salinity show two boundaries in the upper and lower layers. They are prone to double diffusive convection. Salt fingering and diffusive convection can be seen in both the upper and lower boundaries, and salt fingering is stronger at the lower boundary. Diffusive convection also is visible from the surface to the mid-depth of the plume outflow, and the diffusive intrusion is more severe at the upper boundary than the surface and deep. The intensity of double diffusion in the bottom border is greater than the upper boundary. At the deeper parts, the stratification is completely stable. Variations of the positions of greatest salinities in different diagrams are due to changing water masses for different locations and depths and paths of intrusive flow.
Comparative Study of the Flexural Strength of Three Fiber-Reinforced Composites
Torabi K.,Salehi M.
Journal of Dentistry , 2012,
Abstract: Statement of Problem: After 30 years of intermittent reports in the literature, the use of fiber-reinforcement is just now experiencing rapid expansion in dentistry. However, there are some controversy reports in the amounts of flexural strength of fiber reinforced composites to use them as bridges.Purpose: The purpose of this study was to evaluate the flexural strength of three commercially available fiber-reinforced composites including Belle Glass, GC Gradia, and Signum.Materials and Method: Thirty uniform bars of 25×2×2 mm (10 for each group) were fabricated as their manufacturers recommended. Then all specimens were load-ed to failure using a three-point bending test and flexural strength was determined.Results: The mean flexural strength of Belle Glass (386.65 MPa) was significantly ( p < 0.0001) higher than that of GC Gradia (219.25 MPa) and Signum (172.89 MPa). There was no significant difference between GC Gradia and Signum in flexural strength.Conclusion: On the basis of these findings, Belle Glass can be used in clinical practice with greater confidence compared to GC Gradia and Signum.
Bilateral Medial Medullary Stroke: A Challenge in Early Diagnosis
Amir M. Torabi
Case Reports in Neurological Medicine , 2013, DOI: 10.1155/2013/274373
Abstract: Bilateral medial medullary stroke is a very rare type of stroke, with catastrophic consequences. Early diagnosis is crucial. Here, I present a young patient with acute vertigo, progressive generalized weakness, dysarthria, and respiratory failure, who initially was misdiagnosed with acute vestibular syndrome. Initial brain magnetic resonance imaging (MRI) that was done in the acute phase was read as normal. Other possibilities were excluded by lumbar puncture and MRI of cervical spine. MR of C-spine showed lesion at medial medulla; therefore a second MRI of brain was requested, showed characteristic “heart appearance” shape at diffusion weighted (DWI), and confirmed bilateral medial medullary stroke. Retrospectively, a vague-defined hyperintense linear DWI signal at midline was noted in the first brain MRI. Because of the symmetric and midline pattern of this abnormal signal and similarity to an artifact, some radiologists or neurologists may miss this type of stroke. Radiologists and neurologists must recognize clinical and MRI findings of this rare type of stroke, which early treatment could make a difference in patient outcome. The abnormal DWI signal in early stages of this type of stroke may not be a typical “heart appearance” shape, and other variants such as small dot or linear DWI signal at midline must be recognized as early signs of stroke. Also, MRI of cervical spine may be helpful if there is attention to brainstem as well. 1. Introduction Bilateral medial medullary stroke is very rare, and clinical diagnosis without neuroimaging is very difficult [1]. Brainstem encephalitis and Guillain-Barre’s syndrome (GBS) can present similarly [2]. Despite a huge progress in MRI technology, still human factor and experience can determine correct interpretation. Here, I discuss a clinical case and MRI findings of a patient with this diagnosis. 2. Case Presentation A 59-year-old white male patient, right-handed, presented with acute vertigo, nausea, and vomiting to a University Hospital in Dallas, TX, USA, on April 17, 2013. Past medical history was remarkable for untreated hypertension and moderate alcohol consumption. He was not taking any medication at home. Initial examiner (an internist) in that hospital noted bilateral nystagmus, although he did not specify direction or other characteristics of the nystagmus. MRI of brain was done and read as normal (Figure 1), although a faint linear signal at DWI at midline medulla could be seen retrospectively. MR angiography of head (Figure 2) and neck was normal. Patient was told may have acute labyrinthitis
Berry effect in acoustical polarization transport in phononic crystals
R. Torabi,M. Mehrafarin
Physics , 2008, DOI: 10.1134/S0021364008210091
Abstract: We derive the semiclassical equations of motion of a transverse acoustical wave packet propagating in a phononic crystal subject to slowly varying perturbations. The formalism gives rise to Berry effect terms in the equations of motion, manifested as the Rytov polarization rotation law and the polarization-dependent Hall effect. We show that the formalism is also applicable to the case of non-periodic inhomogeneous media, yielding explicit expressions for the Berry effect terms.
Sums of powers via integration
M. Torabi Dashti
Computer Science , 2009,
Abstract: Sum of powers 1^p+...+n^p, with n and p being natural numbers and n>=1, can be expressed as a polynomial function of n of degree p+1. Such representations are often called Faulhaber formulae. A simple recursive algorithm for computing coefficients of Faulhaber formulae is presented. The correctness of the algorithm is proved by giving a recurrence relation on Faulhaber formulae.
Cloud Enabled Text Reader for Individuals with Vision Impairment  [PDF]
Abul K. M. Azad, Mohammed Misbahuddin
Advances in Internet of Things (AIT) , 2017, DOI: 10.4236/ait.2017.74007
Abstract: The paper describes the development of a text reader for people with vision impairments. The system is designed to extract the content of written documents or commercially printed materials. In terms of hardware, it utilizes a camera, a small embedded processor board, and an Alexa Echo Dot. The software involves an open source text detection library called Tesseract along with Leptonica and OpenCV. The system in its current version can only work with English text. By using the Amazon cloud web services, a skill set was deployed, which would read aloud the detected text utilizing a OpenCV program via the Alexa Echo Dot. For this development, a Raspberry Pi was utilized as the embedded processor system.
Web-Based Object Tracking Using Collaborated Camera Network  [PDF]
Abul K. M. Azad, Mohammed Misbahuddin
Advances in Internet of Things (AIT) , 2018, DOI: 10.4236/ait.2018.82002
Abstract: The paper presents a web based vision system using a networked IP camera for tracking objects of interest. Three critical issues are addressed in this paper. First is the detection of moving objects in the foreground; second is the control of pan-tilt-zoom (PTZ) IP cameras based on object location; and third is the collaboration of multiple cameras over the network to track objects of interests independently. The developed system utilized a network of PTZ cameras along with a number of software tools for this implementation. The system was able to track a single and multiple objects successfully. The difficulties in the detection of moving objects are also analyzed while multiple cameras are collaborating over a network utilizing PTZ cameras.
Assessment of oral health indices in Kerman adults aged 35-44 years
M Torabi,S Karimi Afshar
Journal of Isfahan Dental School , 2009,
Abstract: Introduction: Use of Community Periodontal Index of Treatment Needs (CPITN) and Decayed, Missing and Filled Teeth (DMFT) Index provides a picture of oral health status, which is essential for national oral health policy- making and specific interventions. The aim of this study was to assess the oral health status and treatment needs of Kermanian adult population.Materials and Methods: A multi-stratified sample was used to survey 154 adults aged 35-44 years. Data were collected by a questionnaire and standardized oral health exam according to WHO methodology for caries criteria and periodontal status. The data were analyzed by SPSS software, using χ2 and t- student tests.Results: The mean DMFT was 10.88 ± 6.47. 0.6% had healthy periodontium. 3.9% had removable prothesis. 66% brushed their teeth at least one time dily. 5.8% regularly used dental floss. Dental health behavior, gender, educational level, occupation were not significantly associated with DMFT index. There was significant correlation between dental health behavior and CPITN index. There was no significant correlation between dental heal
Internet Accessible Remote Experimentation: Setting the Right Course of Action
Abul K. M. Azad
International Journal of Online Engineering (iJOE) , 2010, DOI: 10.3991/ijoe.v6i3.1380
Abstract: This paper will have two parts. In the first part the author will focus on the current status of remote experimentation designs and how this has impacted our education and research activities with a notion that whether we are moving too fast while its acceptance has not yet realized. While for the second part, the author will describe some of the developments of remote experiment designs through his own work. Researchers have been working on remote experimentations for a considerable period of time and are making remarkable breakthroughs utilizing cutting edge technologies and current understanding of educational and learning strategies. After all of these developments, the popularity of remote experimentations is still very limited and does not have the attention of the academic community to incorporate them as a part of their regular curriculum. There are a number of factors that hinder acceptance of remote laboratories as a part of a curriculum. These are integration of a number of areas, modular designs, commercial products, maintenance, and administrative support. The paper will address these issues and will highlight how we can move forward in a coordinated manner so there will be a viable remote experimentation infrastructure with a high degree of acceptance. The author has a number of federal research grants (USA) where he has developed Internet accessible remote experimentation facilities. These facilities have features like use of single computer for accessing multiple experiments, manipulating experimental setup from remote locations, integrated assessment, and real-time learning management features. The developed facilities have used for delivering a number of experiment courses, while gathering data in terms of achieving learning outcomes and assessing the effectiveness of the system in terms of system designs.
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