Mohammad Dehghani

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We consider the quasilocal thermodynamics of rotating black holes in asymptotically flat and asymptotically anti de Sitter spacetimes. Using the minimal number of intrinsic boundary counterterms inspired by the AdS/CFT correspondence, we find that we are able to carry out an analysis of the thermodynamics of these black holes for virtually all possible(More)
This paper presents a modified set of serpenoid equations to navigate snake robots more efficiently. Serpentine gait is recognized as the most efficient gait for snakes in terms of energy, motor torques and friction forces. However, the conventional serpentine model is based on fixed parameters. Changing parameters to reach an optimal motion or avoid(More)
We investigate the existence of Taub-NUT/bolt solutions in Gauss-Bonnet gravity and obtain the general form of these solutions in d dimensions. We find that for all non-extremal NUT solutions of Einstein gravity having no curvature singularity at r = N , there exist NUT solutions in Gauss-Bonnet gravity that contain these solutions in the limit that the(More)
Landfills leachates are known to contain recalcitrant and/or non-biodegradable organic substances and biological processes are not efficient in these cases. A promising alternative to complete oxidation of biorecalcitrant leachate is the use of ultrasonic process as pre-treatment to convert initially biorecalcitrant compounds to more readily biodegradable(More)
This paper presents a method to model planar continuum robots with backbone, and introduces a method to control, based on the Jacobian matrix. The model includes forces and moments applied to the robot, and is exact in contrast to constant curvature models. Then the position control strategy is presented to put the robot tip in a desired position. Results(More)
The aim of this study was to compare two surgery methods including radial shortening and radial shortening combined with vascularized bone graft for treatment of stage II or IIIa of Kienböck's disease. It is a randomized, controlled clinical trial, which was carried out in 2011-2013. Twenty-four patients were assigned equally to radial shortening group (A)(More)