K P Gopakumar

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INTRODUCTION Management of vesical calculi in children poses an interesting challenge to the urologist. The treatment options currently available include open surgery, transurethral pneumatic cystolithotripsy, percutaneous suprapubic cystolithotomy and shockwave lithotripsy (SWL). Holmium: YAG (Ho: YAG) laser cystolithotripsy represents a novel modality of(More)
Motion of tracked vehicles, especially on soil with shear strength less than 2 kPa under deep sea conditions is an ambitious area to envisage. A tracked deep sea mining machine is being developed to mine polymetallic nodules from 5000-6000 m water depth at the Central Indian Ocean where the sea bed has a very low soil strength. Experimental and numerical(More)
In the present paper a simple sensorless spccd estimation scheme is presented , where the speed information is obtained from the motor phase current ripple. The scheme measures the stator current phasor deviation direction to determine the back emf vector position during inverter zero vector switching states. This measurcment of rotor flux position is done(More)
The current approach for mining of Poly-metallic nodules at a water depth of 6000m uses a tracked vehicle for locomotion on seabed. As the sea bed sediments are very soft clays, it is necessary to study the soil machine interaction characteristics. The extent of sinkage of mining machine in very soft clays is critical as the soil resistances acting on the(More)
Deep Hypothermia and Circulatory Arrest (DHCA) is widely used to repair complex congenital heart lesions in children. We report our experience of DHCA in seven patients of transverse aortic arch aneurysm repair. Anaesthesia consisted of Nitrous Oxide, Oxygen, morphine 1 to 1.5 mg kg-1, halothane and pancuronium. Core cooling on cardiopulmonary bypass was(More)
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