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A self-consistent code is introduced to develop a continuous frequency tunable gyro-BWO. A cavity is designed with TE8,5 mode for 400 GHz band second harmonic oscillation. The experimental verification has been carried out and 2 GHz tunability is observed with output powers of higher than 40 W.
A method is described to form a laminar electron beam for a high power gyrotron. An optimum potential profile is investigated to adjust each electron trajectory in between cathode and 1st anode. A high quality laminar beam is realized with a wide operation window.
Development of two 460 GHz second harmonic gyrotrons for 700 MHz DNP-NMR spectroscopy is presented. One gyrotron is frequency-fixed and the other is frequency tunable in the bandwidth of 1.5 GHz. In addition, the former has a function of frequency modulation.
We demonstrated record 0.37V minimum operation voltage (Vmin) of 2Mb Silicon-on-Thin-Buried-oxide (SOTB) 6T-SRAM. Thanks to the small variability of SOTB (AVT∼1.3 mVµm) and adaptive back biasing (ABB), Vmin was lowered down to ∼0.4 V regardless of temperature. Both fast access time and small standby leakage were achieved by ABB.
We demonstrated record 0.37V minimum operation voltage (Vmin) of 2Mb Silicon-on-Thin-Buried-oxide (SOTB) 6T-SRAM. Thanks to the small variability of SOTB (AVT∼1.3 mVµm) and adaptive back biasing (ABB), Vmin was lowered down to ∼0.4 V regardless of temperature. Both fast access time and small standby leakage were achieved by ABB.
The two-dimensional effect in the reverse gate leakage current of GaN HEMTs is studied by using the TCAD simulation. At the high voltage region, the extension of the potential from the gate to the drain latterly is important role for the reverse gate leakage current characteristics. On the other hands, the electrons flow vertically from the gate electrode to the GaN channel layer at the low gate voltage...
A high-power gyrotron is developed for use in the collective Thomson scattering diagnostic of fusion plasma. It operates at fundamental harmonic with a frequency of 295 GHz. An electron gun with an intense laminar electron beam is designed, and the oscillation power of more than 200 kW is expected.
We demonstrated Silicon on Thin Buried oxide (SOTB) CMOS especially designed for ultralow-voltage (ULV) operation down to 0.4 V for the first time. Utilizing i) dual-poly gate stack with high-k having quarter-gap work functions best for the ULV CMOS operation, and ii) a novel “local ground plane (LGP)” structure that significantly improves short-channel effect (Vth roll off) without increasing local...
Fabrication of a deep field stop layer is the key to backside process of IGBT. The shallow-implanted P-dopant was far deeply activated by Pulse-cw hybrid laser annealing. The approach leads to the low-cost process without MeV-class implantation.
A compact gyrotron operating at a frequency of 394.6 GHz has been designed for sensitivity enhancement of Nuclear Magnetic Resonance (NMR) spectroscopy through Dynamic Nuclear Polarization (DNP). A compact 8T super conducting (SC) magnet is employed for beam guidance. The total length of the device (end-to-end) is 1.02 m.
This paper presents the comparison between the potential of SAR data in compact polarimetry (CP) and full polarimetry mode for snow detection. Eigenvalues based analysis and developed procedure have been used for this inter-comparison. It has been found over the part of rugged Siachen glaciated terrain, Indian Himalaya that dual polarization and compact polarization mode show ∼ 30% and ∼ 15% less...
This paper proposes an efficient speech sample selection technique that can identify those samples that will be well recognized. Conventional confidence measures can identify well-recognized speech samples, but they require speech recognition to estimate confidence scores. Speech samples with low confidence should not undergo recognition since they yield speech documents that will eventually be rejected...
The mobile computing has been introduced to the general public and widely accepted at present. In the next stage, mobile computers enrich our lives and a lot of functions is required. High-performance synthesizers are eagerly anticipated to equip for mobile computing because it can help us and cheer up. Synthesizers are used for sound productions but then it requires enormous computational power....
My presentation focuses on the Shintake (Beamsize) Monitor which can measure nanometer electron beam sizes. The Shintake Monitor is installed in the Accelerator Test Facility 2 (ATF2) at KEK, Japan. ATF2 is a realistic scaled down model of the final focus system for the International Linear Collider. The final focusing scheme named the Local Chromaticity Correction will be tested for the first time...
Three dimensional transparent conductive oxide-less dye-sensitized solar cells (3D-TCO-less DSCs) consisting of a flexible porous titania sheet are reported. The flexible titania sheet is composed of a dye stained porous titania layer and a mesh sheet acting as the backbone. Flexible TCO-less DSCs, tandem DSCs, TCO-less cylinder DSCs and TCO-less cubic DSCs are fabricated and their fundamental photovoltaic...
This paper investigates polarimetric scattering features generated from man-made targets for accurately observing stricken residential area by making full use of quad. polarimetric SAR data set. First, we propose a simple improvement of the scattering power decomposition method by introducing a unitary rotation of the coherency matrix. It is found from the results of the POLSAR image analysis for...
In this study, the capability assessment of fully polarimetric L-band ALOS PALSAR data has been carried out for snow discrimination from other targets. Eigenvaluve based polarization fraction value has been determined for assessing the capability of PALSAR data for snow discrimination. Radar snow index has been developed using polarization fraction and normalized third eigenvalue of coherency matrix...
In this presentation, a new decomposition scheme of first using a rotation of the coherency matrix followed by the four-component decomposition is presented. It is shown using airborne Pi-SAR data sets that oriented urban areas are clearly distinguished from volume scattering as double bounce objects by the rotation of coherency matrix.
The scattering power decomposition for POLSAR data is one of the powerful tools in the radar polarimetry. There are several model-based decomposition techniques. However, since the number of independent observables in POLSAR images is limited, these techniques require several assumptions to obtain unique solution. The authors have proposed an alternative technique with POL-InSAR dataset. By using...
Radar remote sensing has great potential to determine the extent and properties of snow cover. Availability of spaceborne sensor dual-polarization C-band data of ENVISAT- ASAR can enhance the accuracy in measurement of snow physical parameters as compared to single polarization data measurement. This study shows the capability of C-band SAR data for estimating dry snow density over snow covered rugged...
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