Voltage source inverter (VSI) fed induction motors are widely used in variable speed applications. The harmonic distortion in the line currents of the inverter depends on the switching frequency and the pulse width modulation (PWM) technique employed to switch the inverter. The inverter switching loss is also strongly influenced by the PWM technique used. This paper compares the harmonic distor...

Wideband 100 kHz–4 GHz power sensors are presented, which are based on sensing the electrostatic force between an RF signal line and a suspended membrane. The electrostatic force, which is proportional to the square of the rms signal voltage and thus to the signal power, results in a displacement of the suspended membrane. This displacement is detected capacitively, allowing the sensing of the ...

The RF MEMS technology has a great potential to replace conventional switching techniques and it can offer highly miniature switches and sensors with superior RF performance. The main principle of a RF MEMS based power senor is based on sensing the attractive electrostatic force between the signal line and a free standing electrode that is suspended at a small distance from the signal line. Key...

This study provides evidence of the potential hedging effectiveness of insurance derivatives based on regional estimates of catastrophe losses. We estimate the percentage of insurers’ by line and state underwriting risk that could have been eliminated over the 1974 through 1994 period if they had hedged using state-specific catastrophe derivatives based on Property Claims Service (PCS) reported...

This thesis includes an investigation of the starting capability of a high efficiency synchronous motor for direct on-line industrial applications. The approach is to use a hybrid rotor concept to achieve the starting properties of an induction motor and the steady state performance of a synchronous reluctance motor. The hybrid motor rated at 20 kW is compared and evaluated against a same size ...

This paper discusses how to design a Radial Line Slot Antenna (RLSA) whose waveguide is filled with high loss dielectric materials. We introduce a new design for the aperture slot coupling synthesis to restrain the dielectric losses and improve the antenna gain. Based on a newly defined slot coupling, a number of RLSAs with different sizes and loss factors are analyzed and their performances ar...

Antiphospholipid antibodies represent a heterogeneous group of autoantibodies directed against anionic phospholipids (PLs) usually linked to protein cofactors. Their presence during the antiphospholipid syndrome is associated with risks of thrombosis and fetal losses. Among 5 randomly selected monoclonal antiphospholipid antibodies, all originating from a single patient suffering from this auto...

Tumor-derived cell lines are used as in vitro cancer models, but their ability to accurately reflect the phenotype and genotype of the parental histology remains questionable, given the prevalence of documented cell line-specific cytogenetic changes. We have addressed the issue of whether copy number alterations seen in tumor-derived cell lines reflect those observed in studies of fresh tissue ...

The input and output transformers are among the most critical components in the design of a multi-octave amplifier. The total performance of the amplifier (linearity, efficiency, VSWR, gain flatness) will depend on their quality. Transformers with high impedance ratios and for low impedances are more difficult to design in general. In the transmission line transformers very low line impedances ...

Tumor-derived cell lines are used as in vitro cancer models, but their ability to accurately reflect the phenotype and genotype of the parental histology remains questionable, given the prevalence of documented cell line–specific cytogenetic changes. We have addressed the issue of whether copy number alterations seen in tumor-derived cell lines reflect those observed in studies of fresh tissue ...