We investigated wave amplification through the Electron-Cyclotron-Masermechanism. We calculated absorption and emission coefficients without any approximations, also taking into account absorption by the ambient thermal plasma. A power-law energy distribution for the fast electrons was used, as is indicated by X-ray and microwave observations. We developed a model for the saturation length and ...

BACKGROUND Image contrast between normal tissue and brain tumours may sometimes appear to be low in intraoperative ultrasound. Ultrasound imaging of strain is an image modality that has been recently explored for intraoperative imaging of the brain. This study aims to investigate differences in image contrast between ultrasound brightness mode (B-mode) images and ultrasound strain magnitude ima...

It is well established that Synthetic Aperture Imaging Radiometers (SAIR) promise to be powerful sensors for high-resolution observations of the earth at low microwave frequencies. Within this context, the European Space Agency (ESA) has developed the SMOS mission. The launch is scheduled for next Q3. This explorer mission is devoted to the monitoring of Soil Moisture and Ocean Salinity at glob...

The combination of semiconductor quantum dots (QDs) with photonic cavities is a promising way to realize non-classical light sources state-of-the-art performances in terms brightness, indistinguishability and repetition rate. In the present work we demonstrate coupling an InGaAs/GaAs QDs emitting telecom O-band circular Bragg grating cavity. We broadband geometric extraction efficiency enhancem...

A 204MHz all copper RF cavity was designed for the phase II project of Hefei Light Source (HLS). The requirements of the storage ring, which will operate in General Purpose Light Source (GPLS) mode and High Brightness Light Source (HBLS) mode, determine the main parameters of the cavity. On the basis of the simulation of SUPERFISH, three kinds of cavity shape were designed, and one optimum shap...

We observe efficient supercontinuum generation that extends into the visible spectral range by pumping a low differential mode group delay graded index multimode fiber in the normal dispersion regime. For a 28.5 m long fiber, the generated spectrum spans more than two octaves, starting from below 450 nm and extending beyond 2400 nm. The main nonlinear mechanisms contributing to the visible spec...

Using Moderate Resolution Imaging Spectroradiometer and an extratropical cyclone database, the climatological distribution of aerosol optical depth (AOD) in extratropical cyclones is explored based solely on observations. Cyclone-centered composites of aerosol optical depth are constructed for the Northern Hemisphere midlatitude ocean regions, and their seasonal variations are examined. These c...