We present the first sub-mJy ($\approx0.7$ mJy beam$^{-1}$) survey to be completed below 100 MHz, which is over an order of magnitude deeper than previously achieved for widefield imaging any field at these low frequencies. The high resolution ($15 \times 15$ arcsec) image Bo\"otes 34-75 MHz made from 56 hours observation with LOw Frequency ARray (LOFAR) Low Band Antenna (LBA) system. observati...

WASP2 is a lag correlation spectrometer that is optimized for astronomical heterodyne observations of spectral lines from mid-infrared through centimeter wavelengths. Since the instrument is a wideband microwave spectrum analyzer, its basic technology is well suited to radio astronomy, atmospheric remote sensing, and any other application which requires observations of broad spectral lines. In ...

The technique of harmonic motion imaging (HMI) uses the localized stimulus of the oscillatory ultrasonic radiation force as produced by two overlapping beams of distinct frequencies, and estimates the resulting harmonic displacement in the tissue in order to assess its underlying mechanical properties. In this paper, we studied the relationship between measured displacement and stiffness in gel...

Microbubble contrast agents have shown clinical potential for characterising blood flow using 1 to 10 MHz ultrasound; however, scaling their use for similar applications in the mouse with high frequency ultrasound (20 to 60 MHz) has not been addressed. The goal was to determine the utility of microbubbles for mouse imaging with 30 MHz ultrasound by investigating their attenuation and backscatte...

The rise of gas-sensing applications and markets has led to microwave sensors associated polymer-based sensitive materials gaining a lot attention, as they offer the possibility target large variety gases (as polymers can be easily functionalised) at ultra-low power wirelessly (which is major concern in Internet Things). A two-channel microstrip sensor with one resonator coated 1,2 epoxybutane-...

Groups of zebrafish (Danio rerio) embryos receive radiations different frequencies and intensities by means new prototype devices. They are exposed to static (B0, 0 Hz), extremely low-frequency (ELF, 0.2 (LF, 270 kHz), very-high-frequency (VHF, 100 MHz), ultra-high-frequency (UHF, 900 MHz) field irradiations. The applied magnetic 40 mT at Hz, 470 μT kHz, 240 nT MHz, MHz. Such combinations meant...

This paper introduces a general way to make feature extraction for partial discharge (PD) pulse waveshape used in sequence grouping resorting with equivalent time-frequency method. A digital ac PD pulse detection system with bandwidth of 10 kHz 40 MHz and sampling rate of 100 MS/s is introduced, which was developed to study those feature extractors. Simulation and test results with gas insulate...

This paper describes a low-noise, 900-MHz, voltagecontrolled oscillator (VCO) fabricated in a 0.6m CMOS technology. The VCO consists of four-stage fully differential delay cells performing full switching. It utilizes dual-delay path techniques to achieve high oscillation frequency and obtain a wide tuning range. The VCO operates at 750 MHz to 1.2 GHz, and the tuning range is as large as 50%. Th...