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The modeling and reduction of the iron loss is increasingly concerned in both analysis and design of large electromagnetic devices under today's extreme excitations. With the development of the HVDC transmission system, the ac power transformer near the HVDC system is often affected by the dc current, which will flow into the windings through earthed neutrals. A laminated iron core under ac-dc hybrid...
Multi-level modulation on orthogonal frequency division multiplexing (OFDM) signals is experimentally demonstrated by an integrated silicon Mach-Zehnder modulator. The measured bit error rate is well below the forward error correction (FEC) threshold.
A multiwavelength erbium-doped fiber laser stabilized by four-wave mixing in a silicon waveguide was investigated. The laser produced five output wavelengths with 0.38 nm spacing at room temperature.
We experimentally compare the extinction ratio enhancement of RZ-OOK signal using four-wave mixing in a silicon waveguide at 10 Gb/s and 40 Gb/s. The measured extinction ratio enhancement was 4.7 and 4.1 dB, respectively.
We implement a chromatic dispersion monitoring scheme that is based on four wave mixing (FWM) in a 2.1 cm long silicon waveguide. The average idler power produced by FWM in the waveguide depends on the peak power which is dependent on the pump pulse width after chromatic dispersion. Thus the average idler power can be measured to monitor accumulated residual dispersion in the pump. The average idler...
The effect of the variation of B-H properties obtained by different means and data access modes on iron loss and flux in grain oriented (GO) silicon steel laminations is investigated under different exciting frequencies in order to determine an efficient numerical approach to model the lamination configurations. The computational and experimental results are demonstrated on benchmark models in which...
The effect of the B-H and Bm-Wt curves under different dc-biased magnetization on iron loss and flux in Si-Fe lamination obtained by a laminated core model is investigated, which has been demonstrated via the numerical modeling results based on model.
The effect of the variation of B-H properties obtained by different means and data access modes under different exciting frequencies on iron loss and flux in GO silicon steel laminations is investigated, and the results of the numerical modeling is demonstrated on a benchmark model.
The authors have presented a CMOS compatible method for the production and incorporation of NW arrays that may be a basis for future NWFETs and other NW based devices. This work also hints to the possibility of incorporating NWs of different semiconductor material onto the same substrate to achieve high performance FETs, LEDs, and other devices. The authors surmise that alternating layers of Ge and...
Advances in materials growth techniques are enabling new device concepts, circuit approaches, and system architectures to enhance and extend CMOS technology such as tunneling-based static random access memory and steep subthreshold slope III-V tunneling field effect transistors (TFETs). TFETs are essentially gated Esaki (or backward) diodes operating in the reverse (Zener) direction. Recently, the...
This paper investigates the additional iron loss generated in the laminated silicon sheets of the core or the magnetic shields of large power transformers due to the leakage flux. A verification model is well established, and an efficient analysis method is implemented and validated. Both the magnetic and electric anisotropy of the oriented silicon steel sheets are taken into account in 3-D FEM eddy...
High quality, low defect GaAs virtual substrates on Si, produced by the aspect ratio trapping growth technique, have been used for the fabrication of n+GaAs/n+InGaAs/p+GaAs Esaki diodes. All epitaxial layers were grown by reduced-pressure chemical vapor deposition/metalorganic chemical vapor deposition , instead of the molecular beam epitaxy technique commonly used for most high performance Esaki...
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