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37 articles for “M. T. Taba”
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Research ArticleOpen accessIn the author namesFoliar and Soil Application of Potassium Nitrate Affects the Tolerance of Salinity and Canopy Growth of Perennial Ryegrass (Lolium perenne var Boulevard)S.J. Tabatabaei, F. FakhrzadTwo experiments were conducted to determine the effect of KNO3 application on perennial ryegrass salinity tolerance. Two NaCl levels (0 and 60 mM) factorially combined with four KNO3 (KN) levels (0, 5, 10 and 15 mM) as the treatments. The KN was applied either to the soil or foliarly sprayed. The results showed that in both experiments the increased salinity … …American Journal of Agricultural and Biological Sciences, Vol. 3, Issue 3 · 30 Sep 2008 · 8,060 accessesView PDFCite
Research ArticleOpen accessIn the author namesA Novel Teletaction Control System for Detection of Human Pulse Wave with Applications in TeleoperationsJavad Dargahi, Saeed Sokhanvar, Siamak Najarian, Farhad Tabatabai GhomsheThe design of a smart medical tool that can detect the human pulse and transfer its data to a remote location is presented. The resulting control system can be used to detect the pulse wave of human obtained from the wrist area. Fabrication of the tactile sensor and its calibration procedure are discussed as well. Additionally, the design of the … …American Journal of Applied Sciences, Vol. 5, Issue 6 · 30 Jun 2008 · 6,922 accessesView PDFCite
Research ArticleOpen accessIn the author namesEarthquake Risk Management Strategy Plan Using Nonparametric Estimation of Hazard RateAflaton Amiri, Ramin TabatabaeiEarthquake risk is defined as the product of hazard and vulnerability studies. The main aims of earthquake risk management are to make plans and apply those for reducing human losses and protect properties from earthquake hazards. Natural risk managers are studying to identify and manage the risk from an earthquake for highly populated urban areas. They want to put some … …American Journal of Applied Sciences, Vol. 5, Issue 5 · 31 May 2008 · 6,745 accessesView PDFCite
Research ArticleOpen accessIn the author namesTactile Distinction of an Artery and a Tumor in a Soft Tissue by Finite Element MethodAli Abouei Mehrizi, Siamak Najarian, Majid Moini, Farhad Tabatabai GhomsheTactile detection of a tumor and an artery in a tissue and distinction of a healthy artery from a stenotic artery, using finite element method, are presented. Four 2D models of tissue have been created: tissue itself, tissue including a tumor (TIT), tissue including a healthy artery (TIHA), and tissue including a stenotic artery (TISA). After solving four models with … …American Journal of Applied Sciences, Vol. 5, Issue 2 · 28 Feb 2008 · 7,598 accessesView PDFCite
Research ArticleOpen accessIn the author namesFabrication and Testing of a Medical Surgical Instrument Capable of Detecting Simulated Embedded LumpsJavad Dargahi, Siamak Najarian, Reza Ramezanifard, Farhad Tabatabai GhomsheA novel endoscopic grasper is being fabricated and tested. This grasper can be used in detecting lumps or tumors in biological tissues. The detailed fabrication process of the tactile sensor has been discussed. Custom-made sensors were integrated with the jaws of the endoscopic grasper and objects with known tactile features were tested by the designed grasper. Different experiments were performed … …American Journal of Applied Sciences, Vol. 4, Issue 12 · 31 Dec 2007 · 7,002 accessesView PDFCite
Research ArticleOpen accessIn the author namesOrientation Detection of Sensed Objects using a Four Sensor Tactile System with Applications in Bio-RoboticsAshkan Mirbagheri, Javad Dargahi, Siamak Najarian, Farhad Tabatabai GhomsheA novel approach is presented that can be used in determining the sensitivity of a four sensor tactile sensor to the orientation of the contacted objects. Computer simulations were conducted by using a rectangular probe of 14 mm by 7 mm size and applying three magnitudes of forces, i.e., 0.5, 1, and 2 N. A bi-variate function was obtained, showing … …American Journal of Applied Sciences, Vol. 4, Issue 11 · 30 Nov 2007 · 7,204 accessesView PDFCite
Research ArticleOpen accessIn the author namesA Biomechanical Composite Model to Determine Effective Elastic Moduli of the CNS Gray MatterMehdi Khoshgoftar, Siamak Najarian, Farhad Farmanzad et al.Brain tissue is a heterogeneous material with complicated microstructural features. Models based on microstructure can lead to more accurate and physically realistic predictions of mechanical characteristics of brain tissue. A two-step Mori-Tanaka/Voigt homogenization procedure is implemented into a 3D microstructurally-based multi-phase composite model, composed of randomly-oriented elastic axons, dendrites and neuronal cell bodies surrounded by an elastic matrix. The effects … …American Journal of Applied Sciences, Vol. 4, Issue 11 · 30 Nov 2007 · 7,777 accessesView PDFCite
Research ArticleOpen accessIn the author namesMathematical Modeling of a Tactile Sensor with Applications in Minimally Invasive SurgeryAshkan Mirbagheri, Siamak Najarian, Javad Dargahi, Farhad Tabatabai GhomsheThis paper describes mathematical modeling of a novel supported tactile sensor. This system has only three or four sensing elements instead of an array configuration. By writing a code, together with using the piezoelectric capabilities of the finite element analysis software, it is possible to extract the stresses developed in the tactile membrane along the edges of the sensing elements, … …American Journal of Applied Sciences, Vol. 4, Issue 10 · 31 Oct 2007 · 7,189 accessesView PDFCite
Research ArticleOpen accessIn the author namesDesign, Fabrication, and Testing of a Membrane Piezoelectric Tactile Sensor with Four Sensing ElementsAshkan Mirbagheri, Javad Dargahi, Siamak Najarian, Farhad Tabatabai GhomsheWe presented design, fabrication, and testing of a novel membrane tactile sensing system with only four sensing elements. By using membrane stress combined with triangulation approach, it was possible to overcome the problems such as cross-talk between sensing elements, fragility, and complexity. The fabrication of the sensing elements performed using photolithographic and etching techniques. Position, orientation, and magnitude of applied … …American Journal of Applied Sciences, Vol. 4, Issue 9 · 30 Sep 2007 · 7,074 accessesView PDFCite
Research ArticleOpen accessIn the author namesA Novel Modeling Approach for Collision Avoidance in Robotic SurgeryReza Ramezanifard, Javad Dargahi, Siamak Najarian, Farhad Tabatabai GhomsheWe present a new system that can be used in combination with an array of ultrasonic piezoelectric sensors and has application in surgical navigation procedures. Using the proposed assembly, the maneuverability of the surgical tools can be enhanced and the incidence of potentially damaging contact with non-target tissue can be reduced. The emphasis of our work was based on controlling … …American Journal of Applied Sciences, Vol. 4, Issue 9 · 30 Sep 2007 · 6,798 accessesView PDFCite