A zero voltage switched resonant converter has been designed and built as a transcutaneous energy transmission system to transfer 30 W across a variable air gap of 5-20 mm. The converter could power a total implantabl...
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A zero voltage switched resonant converter has been designed and built as a transcutaneous energy transmission system to transfer 30 W across a variable air gap of 5-20 mm. The converter could power a total implantable artificial heart through intact skin by utilizing a transformer. In the converter, the large leakage inductances of the transcutaneous transformer have been incorporated in the resonant inductor. The steady-state operation of an experimental transcutaneous power supply has been accurately predicted by the theoretical analysis.< >
The discrimination of gas-liquid two-phase flow patterns has so far been made mainly by visual observation; and various flow parameters characterizing the flow, such as fluctuating pressures, void fraction etc., have ...
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The discrimination of gas-liquid two-phase flow patterns has so far been made mainly by visual observation; and various flow parameters characterizing the flow, such as fluctuating pressures, void fraction etc., have been employed as quantitative tools for this purpose. It would be useful for the prediction and prevention of accidents experienced in thermal engineering plants dealing with the flow if it could be found the effective techniques for analyzing void fraction signals detected for diagnosing plant operation states. This paper presents pattern recognition and clustering techniques for analyzing the cross-sectional mean void fraction signals in gas-liquid two-phase flow based on an AR-model with bias components. The pattern recognition method based on the Bayes decision rule was applied for the recognition of flow regimes which were determined by visual observations. The clustering methods based on K-mean algorithm and mixture probability algorithm were applied for the determination of the new boundaries on a superficial gas-liquid velocities diagram. The effectiveness of the discussed techniques were confirmed.
An evaluation of autonomic nervous control using fluctuations of R-R interval variability is presented. Diabetic autonomic neuropathy concerned with autonomic nervous control is discriminated by using the R-R interval...
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An evaluation of autonomic nervous control using fluctuations of R-R interval variability is presented. Diabetic autonomic neuropathy concerned with autonomic nervous control is discriminated by using the R-R interval time series in the frequency domain. Diabetic autonomic neuropathy has been classified with high recognition employing this method.< >
The authors present a feed circuit for the flat energy density antenna for mobile telephone, and measurement results on its input characteristics and radiation pattern at 1.5 GHz. The correlation coefficient between r...
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The authors present a feed circuit for the flat energy density antenna for mobile telephone, and measurement results on its input characteristics and radiation pattern at 1.5 GHz. The correlation coefficient between ring patch and notch antenna of less than 0.1 is small enough for diversity branches. To verify the diversity effect of this antenna, the authors measured urban propagation characteristics at 900 MHz and compared them with results for a space diversity antenna. It is confirmed that the flat energy density antenna is appropriate for the diversity antenna of a mobile telephone.< >
Kerr electro-optic field mapping measurements using the sensitive AC modulation method were made in liquid nitrogen. The steady-state electric fields between parallel stainless steel electrodes that had a gap of 7 mm ...
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Kerr electro-optic field mapping measurements using the sensitive AC modulation method were made in liquid nitrogen. The steady-state electric fields between parallel stainless steel electrodes that had a gap of 7 mm are shown to be essentially uniform for voltages up to 70 kV with no significant space charge distortion. The Kerr constant B of liquid nitrogen is constant over the AC modulation frequency range of 1-20 kHz, while increasing above 20 kHz. This change of B with the modulation frequency coincides with the frequency-amplitude gain characteristic of the lock-in amplifier used, so that B is independent of the AC modulation frequency within the range of this study. B monotonically decreases with increasing temperature, T, thus decreasing liquid nitrogen density, rho , so that B is related linearly to rho /T. The polarizability anisotropy of liquid nitrogen is evaluated to be 8.3*10/sup -41/ F-m/sup 2/ from the slope of the B-( rho /T) characteristic, obtained from a simple physical model.< >
The authors review HIGIPS (High-Speed General-Purpose Image Processing System) design concepts and a prototype HIGIPS configuration, and describe its application to the recognition of periodic motions. HIGIPS, which e...
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The authors review HIGIPS (High-Speed General-Purpose Image Processing System) design concepts and a prototype HIGIPS configuration, and describe its application to the recognition of periodic motions. HIGIPS, which employs a combination of pipeline architecture and multiprocessor architecture, is a high-speed, high-performance, and low-cost N*(M+1) multi-microprocessor parallel machine, where N is the number of pipeline stages and M+1 is the number of processors in each stage. The application of HIGIPS to the recognition of a pendulumlike motion is discussed. From this experiment, it is clear that HIGIPS can efficiently perform dynamic image processing and recognition.< >
A novel flat antenna system for energy density reception for mobile telephony is presented, and the configuration of the model antenna is demonstrated. The system is based on the assembly of a notch array cut into the...
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A novel flat antenna system for energy density reception for mobile telephony is presented, and the configuration of the model antenna is demonstrated. The system is based on the assembly of a notch array cut into the circular disk of a ring patch antenna. The measured input impedance characteristics and radiation pattern of the antenna are presented. The experimental results indicate that this antenna system is appropriate as a mobile telephony antenna.< >
A class of sequential and adaptive algorithms for parameter estimation are presented that are based on the iterative estimate-maximize (EM) algorithm. In some cases sequential algorithms are derived that perform an ex...
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A class of sequential and adaptive algorithms for parameter estimation are presented that are based on the iterative estimate-maximize (EM) algorithm. In some cases sequential algorithms are derived that perform an exact EM step in each recursion; an example for these cases is given for the linear least-squares problem. In general, however, it is necessary to approximate the EM iteration in order to develop sequential algorithms. The application of this class of algorithms to the two-microphone noise cancellation problem is described.< >
A sufficient condition is derived for the existence of an output constant gain feedback controller which stabilizes a single-input single-output dynamical system with a linear nominal part and matched uncertainties. T...
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A sufficient condition is derived for the existence of an output constant gain feedback controller which stabilizes a single-input single-output dynamical system with a linear nominal part and matched uncertainties. The sufficient condition is significantly less restrictive than a recently derived one [1]. If such a controller exists, it may readily be computed.
Single crystalline GaAs0.6P0.4 is grown on (100)2° off Si substrate by metalorganic chemical vapor deposition with the intermediate layers of GaP, (GaP/GaAsP) superlattice and (GaAsP/GaAs) superlattice. PL intens...
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Single crystalline GaAs0.6P0.4 is grown on (100)2° off Si substrate by metalorganic chemical vapor deposition with the intermediate layers of GaP, (GaP/GaAsP) superlattice and (GaAsP/GaAs) superlattice. PL intensity of GaAs0.6P0.4/Si is about 40% of commercially available GaAs0.6P0.4 grown on GaAs substrate by VPE. Very smooth mirror-like surface is obtained and no crosshatch pattern such as is seen on GaAs0.6P0.4 on GaAs is observed on GaAs0.6P0.4/Si surface.
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