This paper reports the improvements and limitations of MBE grown 1.3μm GaAsSb/GaAs single QW lasers. At room temperature, the devices show a low threshold current density (Jth) of 253 Acm, a transparent current density of 98 Acm, an internal quantum efficiency of 71%, an optical loss of 18 cm and a characteristic temperature (T0) = 51K. The defect related recombination in these devices is negli...

In order to reduce pacing current threshold in transesophageal stimulation, a novel multichannel transesophageal pacemaker and multichannel esophageal lead has been developed. Three different approaches to reduce pacing current threshold were clinically studied. Precise positioning of the pacing dipole allowed reduction of pacing current threshold on average by 20% over the standard bipolar tra...

in conventional direct torque control (dtc), the stator flux is usually kept constant by controlling the x-axis component of the stator voltage in the stator flux reference frame. the torque is then controlled by the y-axis component of stator voltage. in this scenario, the stator current does not exceed its permissible value. however, in the so-called optimal efficiency mode, the induction mot...

In this research the influence of adding SiC on microstructure and electrical properties of ZnO-based Nanocomposite varistors were investigated. SiC was added with amounts of 10-0 mass% to ZnO-based varistor composition. It is found that SiC allows reaching to high threshold voltage with formation of fine-graine...

The September 11 attack on the US has revealed an unprecedented terrorism worldwide range of destruction. Recently, it has been related to the percolation of worldwide spread passive supporters. This scheme puts the suppression of the percolation effect as the major strategic issue in the fight against terrorism. Accordingly the world density of passive supporters should be reduced below the pe...