Current Issue : July - September Volume : 2019 Issue Number : 3 Articles : 5 Articles
LaMnO3 (LMO) nanopowder was synthesized by the microwave combustion method using glycine and nitrate salts of La and Mn\nas precursors. The as-prepared LMO powder was pressed at high pressure and annealed at 1000 Degree Celsius for 8 hours to make a target for\nthin film deposition. The structural and elemental analysis was obtained by X-ray diffraction (XRD) and energy dispersive X-ray\nspectroscopy (EDS). Thin films of LMO were fabricated using pulsed electron deposition (PED) at room temperature. The effects\nof discharge voltage and oxygen/argon flux ratio on the produced thin films were studied. The study shows that stoichiometry and\nstructure of the target was preserved well in the thin films prepared with a discharge voltage from 14 to 15 kV, while the oxygen/\nnitrogen flux ratio did not show a clear effect on the quality of thin films....
In this paper, a wideband antenna was designed for super-wideband (SWB) applications.\nThe proposed antenna was fed with a rectangular tapered microstrip feed line, which operated over\na SWB frequency range (1.42 GHz to 50 GHz). The antenna was implemented at a compact size with\nelectrical dimensions of.........................
PbS thin films with thickness between 100 and 150 nm were grown for the first time bymicrowave-assisted chemical bath deposition\nin a commercial automated system with deposition times not exceeding 5 min. X-ray diffraction analysis shows that the thin films\nhave cubic rock salt type structure with good crystallinity. The grain size increased from 18 to 20 nm, as the deposition time\nincreased. Energy dispersive X-ray results confirm that the films are stoichiometric. Optical measurements show that thin films\nhave relatively high absorption coefficients between 10^4 and 10^5 cm-1 in the visible range. In addition, the films exhibit a direct\ngap, within the energy range from 1.0 to 1.35 eV. The electrical properties, such as conductivity, the Seebeck coefficient, carrier\nconcentration, and carrier mobility, are discussed....
A device for measuring biological small volume liquid samples in real time is appealing.\nOne way to achieve this is by using a microwave sensor based on reflection measurement. A prototype\nsensor was manufactured from low cost printed circuit board (PCB) combined with a microfluidic\nchannel made of polymethylsiloxane (PDMS). Such a sensor was simulated, manufactured, and\ntested including a vacuum powered sample delivery system with robust fluidic ports. The sensor\nhad a broad frequency band from 150 kHz to 6 GHz with three resonance frequencies applied in\nsensing. As a proof of concept, the sensor was able to detect a NaCl content of 125 to 155 mmol in\nwater, which is the typical concentration in healthy human blood plasma....
The correlation-based synthetic aperture radar imaging technique, termed radar coincidence\nimaging, is extended to a fully multistatic multiple-input multiple-output (MIMO) synthetic aperture\nradar (SAR) configuration. Within this framework, we explore two distinct processing schemes:\nincoherent processing of intensity data, obtained using asynchronous receivers and inspired by optical\nghost imaging works, and coherent processing with synchronized array elements. Improvement in\nresolution and image quality is demonstrated in both cases using numerical simulations that model\nan airborne MIMO SAR system at microwave frequencies. Finally, we explore methods for reducing\nmeasurement times and computational loads through compressive and gradient image reconstruction\nusing phaseless data....
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