This paper presents design and analysis of a three phase induction motor drive using IGBT‟s at the inverter power stage with volts hertz control (V/F) in closed loop using dsPIC30F2010 as a controller. It is a 16 bit high-performance digital signal controller (DSC). DSC is a single chip embedded controller that integrates the controller attributes of a microcontroller with the computation and t...

Meldrum, B. S. & Chapman, A. G. (1983) in Glutamine. Glutamate and GABA in the Central Nervous System (Hertz, L., McGeer, E. G., Kvamme, E. & Schousboe, A,, eds.), pp. 62M41, Alan R. Liss, Inc. New York Meldrum, B. S., Croucher, M. J. & Krogsgaard-Larsen, P. (1982) in Problems in GABA Research from Brain to Bacteria (Okada, Y. & Roberts, E., eds.), pp. 182-191, Excerpta Medica, Amsterdam Mitche...

– We investigated impacts of nearly elastic spherical gels (very soft balls) onto a solid substrate. The Hertz contact deformation expected in the static (elastic) limit was observed only at very small impact velocities. For larger velocities, a gel ball deformed into flattened forms like a pancake. We measured the size of gel balls at the maximal deformation and a contact time as a function of...

We study conservative partially hyperbolic diffeomorphisms in 3-manifolds. show that they are always accessible and deduce as a result every C1+ 3-manifold must be ergodic, giving an affirmative answer to conjecture of Hertz-Hertz-Ures the context also get some results for general homotopic identity isotopy classes on Seifert manifolds.

– After thrown onto a solid substrate, very soft spherical gels bounce repeatedly. Separate rheological measurements suggest that these balls can be treated as nearly elastic. The Hertz contact deformation expected in the static (elastic) limit was observed only at very small impact velocities. For larger velocities, the gel ball deformed into flattened forms like a pancake. We measured the siz...

We compare two established and a new method for the calculation of spectral bounds for Hessian matrices on hyperrectangles by applying them to a large collection of 1522 objective and constraint functions extracted from benchmark global optimization problems. Both the tightness of the spectral bounds and the computational effort of the three methods, which apply to C2 functions φ : R → R that c...

This paper presents noise problems associated with the use of air-turbine drills in dental practice. Two hundred and fifty dentists (male and female) were randomly selected from the faculty of dentistry as well as the dentists who worked private in Tehran. The results indicated that the mean value of sound pressure level produced by the high-speed drills was 69.1 db. Most of the energy from...